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/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 #include <linux/ratelimit.h> 33 #include <crypto/hash.h> 34 #include <linux/falloc.h> 35 #ifdef __KERNEL__ 36 #include <linux/compat.h> 37 #endif 38 39 /* 40 * The fourth extended filesystem constants/structures 41 */ 42 43 /* 44 * Define EXT4FS_DEBUG to produce debug messages 45 */ 46 #undef EXT4FS_DEBUG 47 48 /* 49 * Debug code 50 */ 51 #ifdef EXT4FS_DEBUG 52 #define ext4_debug(f, a...) \ 53 do { \ 54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 55 __FILE__, __LINE__, __func__); \ 56 printk(KERN_DEBUG f, ## a); \ 57 } while (0) 58 #else 59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 60 #endif 61 62 /* 63 * Turn on EXT_DEBUG to get lots of info about extents operations. 64 */ 65 #define EXT_DEBUG__ 66 #ifdef EXT_DEBUG 67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 68 #else 69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 70 #endif 71 72 /* data type for block offset of block group */ 73 typedef int ext4_grpblk_t; 74 75 /* data type for filesystem-wide blocks number */ 76 typedef unsigned long long ext4_fsblk_t; 77 78 /* data type for file logical block number */ 79 typedef __u32 ext4_lblk_t; 80 81 /* data type for block group number */ 82 typedef unsigned int ext4_group_t; 83 84 enum SHIFT_DIRECTION { 85 SHIFT_LEFT = 0, 86 SHIFT_RIGHT, 87 }; 88 89 /* 90 * Flags used in mballoc's allocation_context flags field. 91 * 92 * Also used to show what's going on for debugging purposes when the 93 * flag field is exported via the traceport interface 94 */ 95 96 /* prefer goal again. length */ 97 #define EXT4_MB_HINT_MERGE 0x0001 98 /* blocks already reserved */ 99 #define EXT4_MB_HINT_RESERVED 0x0002 100 /* metadata is being allocated */ 101 #define EXT4_MB_HINT_METADATA 0x0004 102 /* first blocks in the file */ 103 #define EXT4_MB_HINT_FIRST 0x0008 104 /* search for the best chunk */ 105 #define EXT4_MB_HINT_BEST 0x0010 106 /* data is being allocated */ 107 #define EXT4_MB_HINT_DATA 0x0020 108 /* don't preallocate (for tails) */ 109 #define EXT4_MB_HINT_NOPREALLOC 0x0040 110 /* allocate for locality group */ 111 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 112 /* allocate goal blocks or none */ 113 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 114 /* goal is meaningful */ 115 #define EXT4_MB_HINT_TRY_GOAL 0x0200 116 /* blocks already pre-reserved by delayed allocation */ 117 #define EXT4_MB_DELALLOC_RESERVED 0x0400 118 /* We are doing stream allocation */ 119 #define EXT4_MB_STREAM_ALLOC 0x0800 120 /* Use reserved root blocks if needed */ 121 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 122 /* Use blocks from reserved pool */ 123 #define EXT4_MB_USE_RESERVED 0x2000 124 125 struct ext4_allocation_request { 126 /* target inode for block we're allocating */ 127 struct inode *inode; 128 /* how many blocks we want to allocate */ 129 unsigned int len; 130 /* logical block in target inode */ 131 ext4_lblk_t logical; 132 /* the closest logical allocated block to the left */ 133 ext4_lblk_t lleft; 134 /* the closest logical allocated block to the right */ 135 ext4_lblk_t lright; 136 /* phys. target (a hint) */ 137 ext4_fsblk_t goal; 138 /* phys. block for the closest logical allocated block to the left */ 139 ext4_fsblk_t pleft; 140 /* phys. block for the closest logical allocated block to the right */ 141 ext4_fsblk_t pright; 142 /* flags. see above EXT4_MB_HINT_* */ 143 unsigned int flags; 144 }; 145 146 /* 147 * Logical to physical block mapping, used by ext4_map_blocks() 148 * 149 * This structure is used to pass requests into ext4_map_blocks() as 150 * well as to store the information returned by ext4_map_blocks(). It 151 * takes less room on the stack than a struct buffer_head. 152 */ 153 #define EXT4_MAP_NEW (1 << BH_New) 154 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 157 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 158 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 159 160 struct ext4_map_blocks { 161 ext4_fsblk_t m_pblk; 162 ext4_lblk_t m_lblk; 163 unsigned int m_len; 164 unsigned int m_flags; 165 }; 166 167 /* 168 * Flags for ext4_io_end->flags 169 */ 170 #define EXT4_IO_END_UNWRITTEN 0x0001 171 172 /* 173 * For converting unwritten extents on a work queue. 'handle' is used for 174 * buffered writeback. 175 */ 176 typedef struct ext4_io_end { 177 struct list_head list; /* per-file finished IO list */ 178 handle_t *handle; /* handle reserved for extent 179 * conversion */ 180 struct inode *inode; /* file being written to */ 181 struct bio *bio; /* Linked list of completed 182 * bios covering the extent */ 183 unsigned int flag; /* unwritten or not */ 184 loff_t offset; /* offset in the file */ 185 ssize_t size; /* size of the extent */ 186 atomic_t count; /* reference counter */ 187 } ext4_io_end_t; 188 189 struct ext4_io_submit { 190 struct writeback_control *io_wbc; 191 struct bio *io_bio; 192 ext4_io_end_t *io_end; 193 sector_t io_next_block; 194 }; 195 196 /* 197 * Special inodes numbers 198 */ 199 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 200 #define EXT4_ROOT_INO 2 /* Root inode */ 201 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 202 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 203 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 204 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 205 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 206 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 207 208 /* First non-reserved inode for old ext4 filesystems */ 209 #define EXT4_GOOD_OLD_FIRST_INO 11 210 211 /* 212 * Maximal count of links to a file 213 */ 214 #define EXT4_LINK_MAX 65000 215 216 /* 217 * Macro-instructions used to manage several block sizes 218 */ 219 #define EXT4_MIN_BLOCK_SIZE 1024 220 #define EXT4_MAX_BLOCK_SIZE 65536 221 #define EXT4_MIN_BLOCK_LOG_SIZE 10 222 #define EXT4_MAX_BLOCK_LOG_SIZE 16 223 #ifdef __KERNEL__ 224 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 225 #else 226 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 227 #endif 228 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 229 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 230 EXT4_SB(s)->s_cluster_bits) 231 #ifdef __KERNEL__ 232 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 233 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 234 #else 235 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 236 #endif 237 #ifdef __KERNEL__ 238 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 239 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 240 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 241 #else 242 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 243 EXT4_GOOD_OLD_INODE_SIZE : \ 244 (s)->s_inode_size) 245 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 246 EXT4_GOOD_OLD_FIRST_INO : \ 247 (s)->s_first_ino) 248 #endif 249 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 250 251 /* Translate a block number to a cluster number */ 252 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 253 /* Translate a cluster number to a block number */ 254 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 255 /* Translate # of blks to # of clusters */ 256 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 257 (sbi)->s_cluster_bits) 258 /* Mask out the low bits to get the starting block of the cluster */ 259 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 260 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 261 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 262 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 263 /* Get the cluster offset */ 264 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 265 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 266 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 267 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 268 269 /* 270 * Structure of a blocks group descriptor 271 */ 272 struct ext4_group_desc 273 { 274 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 275 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 276 __le32 bg_inode_table_lo; /* Inodes table block */ 277 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 278 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 279 __le16 bg_used_dirs_count_lo; /* Directories count */ 280 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 281 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 282 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 283 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 284 __le16 bg_itable_unused_lo; /* Unused inodes count */ 285 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 286 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 287 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 288 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 289 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 290 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 291 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 292 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 293 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 294 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 295 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 296 __u32 bg_reserved; 297 }; 298 299 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 300 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 301 sizeof(__le16)) 302 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 303 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 304 sizeof(__le16)) 305 306 /* 307 * Structure of a flex block group info 308 */ 309 310 struct flex_groups { 311 atomic64_t free_clusters; 312 atomic_t free_inodes; 313 atomic_t used_dirs; 314 }; 315 316 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 317 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 318 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 319 320 /* 321 * Macro-instructions used to manage group descriptors 322 */ 323 #define EXT4_MIN_DESC_SIZE 32 324 #define EXT4_MIN_DESC_SIZE_64BIT 64 325 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 326 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 327 #ifdef __KERNEL__ 328 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 329 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 330 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 331 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 332 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 333 #else 334 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 335 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 336 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 337 #endif 338 339 /* 340 * Constants relative to the data blocks 341 */ 342 #define EXT4_NDIR_BLOCKS 12 343 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 344 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 345 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 346 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 347 348 /* 349 * Inode flags 350 */ 351 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 352 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 353 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 354 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 355 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 356 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 357 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 358 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 359 /* Reserved for compression usage... */ 360 #define EXT4_DIRTY_FL 0x00000100 361 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 362 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 363 /* nb: was previously EXT2_ECOMPR_FL */ 364 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 365 /* End compression flags --- maybe not all used */ 366 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 367 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 368 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 369 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 370 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 371 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 372 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 373 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 374 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 375 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 376 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 377 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 378 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 379 380 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 381 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 382 383 /* Flags that should be inherited by new inodes from their parent. */ 384 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 385 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 386 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 387 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 388 389 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 390 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 391 392 /* Flags that are appropriate for non-directories/regular files. */ 393 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 394 395 /* Mask out flags that are inappropriate for the given type of inode. */ 396 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 397 { 398 if (S_ISDIR(mode)) 399 return flags; 400 else if (S_ISREG(mode)) 401 return flags & EXT4_REG_FLMASK; 402 else 403 return flags & EXT4_OTHER_FLMASK; 404 } 405 406 /* 407 * Inode flags used for atomic set/get 408 */ 409 enum { 410 EXT4_INODE_SECRM = 0, /* Secure deletion */ 411 EXT4_INODE_UNRM = 1, /* Undelete */ 412 EXT4_INODE_COMPR = 2, /* Compress file */ 413 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 414 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 415 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 416 EXT4_INODE_NODUMP = 6, /* do not dump file */ 417 EXT4_INODE_NOATIME = 7, /* do not update atime */ 418 /* Reserved for compression usage... */ 419 EXT4_INODE_DIRTY = 8, 420 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 421 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 422 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 423 /* End compression flags --- maybe not all used */ 424 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 425 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 426 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 427 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 428 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 429 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 430 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 431 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 432 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 433 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 434 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 435 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 436 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 437 }; 438 439 /* 440 * Since it's pretty easy to mix up bit numbers and hex values, we use a 441 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 442 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 443 * any extra space in the compiled kernel image, otherwise, the build will fail. 444 * It's important that these values are the same, since we are using 445 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 446 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 447 * values found in ext2, ext3 and ext4 filesystems, and of course the values 448 * defined in e2fsprogs. 449 * 450 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 451 */ 452 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 453 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 454 455 static inline void ext4_check_flag_values(void) 456 { 457 CHECK_FLAG_VALUE(SECRM); 458 CHECK_FLAG_VALUE(UNRM); 459 CHECK_FLAG_VALUE(COMPR); 460 CHECK_FLAG_VALUE(SYNC); 461 CHECK_FLAG_VALUE(IMMUTABLE); 462 CHECK_FLAG_VALUE(APPEND); 463 CHECK_FLAG_VALUE(NODUMP); 464 CHECK_FLAG_VALUE(NOATIME); 465 CHECK_FLAG_VALUE(DIRTY); 466 CHECK_FLAG_VALUE(COMPRBLK); 467 CHECK_FLAG_VALUE(NOCOMPR); 468 CHECK_FLAG_VALUE(ENCRYPT); 469 CHECK_FLAG_VALUE(INDEX); 470 CHECK_FLAG_VALUE(IMAGIC); 471 CHECK_FLAG_VALUE(JOURNAL_DATA); 472 CHECK_FLAG_VALUE(NOTAIL); 473 CHECK_FLAG_VALUE(DIRSYNC); 474 CHECK_FLAG_VALUE(TOPDIR); 475 CHECK_FLAG_VALUE(HUGE_FILE); 476 CHECK_FLAG_VALUE(EXTENTS); 477 CHECK_FLAG_VALUE(EA_INODE); 478 CHECK_FLAG_VALUE(EOFBLOCKS); 479 CHECK_FLAG_VALUE(INLINE_DATA); 480 CHECK_FLAG_VALUE(PROJINHERIT); 481 CHECK_FLAG_VALUE(RESERVED); 482 } 483 484 /* Used to pass group descriptor data when online resize is done */ 485 struct ext4_new_group_input { 486 __u32 group; /* Group number for this data */ 487 __u64 block_bitmap; /* Absolute block number of block bitmap */ 488 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 489 __u64 inode_table; /* Absolute block number of inode table start */ 490 __u32 blocks_count; /* Total number of blocks in this group */ 491 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 492 __u16 unused; 493 }; 494 495 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 496 struct compat_ext4_new_group_input { 497 u32 group; 498 compat_u64 block_bitmap; 499 compat_u64 inode_bitmap; 500 compat_u64 inode_table; 501 u32 blocks_count; 502 u16 reserved_blocks; 503 u16 unused; 504 }; 505 #endif 506 507 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 508 struct ext4_new_group_data { 509 __u32 group; 510 __u64 block_bitmap; 511 __u64 inode_bitmap; 512 __u64 inode_table; 513 __u32 blocks_count; 514 __u16 reserved_blocks; 515 __u16 unused; 516 __u32 free_blocks_count; 517 }; 518 519 /* Indexes used to index group tables in ext4_new_group_data */ 520 enum { 521 BLOCK_BITMAP = 0, /* block bitmap */ 522 INODE_BITMAP, /* inode bitmap */ 523 INODE_TABLE, /* inode tables */ 524 GROUP_TABLE_COUNT, 525 }; 526 527 /* 528 * Flags used by ext4_map_blocks() 529 */ 530 /* Allocate any needed blocks and/or convert an unwritten 531 extent to be an initialized ext4 */ 532 #define EXT4_GET_BLOCKS_CREATE 0x0001 533 /* Request the creation of an unwritten extent */ 534 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 535 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 536 EXT4_GET_BLOCKS_CREATE) 537 /* Caller is from the delayed allocation writeout path 538 * finally doing the actual allocation of delayed blocks */ 539 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 540 /* caller is from the direct IO path, request to creation of an 541 unwritten extents if not allocated, split the unwritten 542 extent if blocks has been preallocated already*/ 543 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 544 #define EXT4_GET_BLOCKS_CONVERT 0x0010 545 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 546 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 547 /* Convert extent to initialized after IO complete */ 548 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 549 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 550 /* Eventual metadata allocation (due to growing extent tree) 551 * should not fail, so try to use reserved blocks for that.*/ 552 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 553 /* Don't normalize allocation size (used for fallocate) */ 554 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 555 /* Request will not result in inode size update (user for fallocate) */ 556 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 557 /* Do not take i_data_sem locking in ext4_map_blocks */ 558 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 559 /* Convert written extents to unwritten */ 560 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200 561 562 /* 563 * The bit position of these flags must not overlap with any of the 564 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 565 * read_extent_tree_block(), ext4_split_extent_at(), 566 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 567 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 568 * caching the extents when reading from the extent tree while a 569 * truncate or punch hole operation is in progress. 570 */ 571 #define EXT4_EX_NOCACHE 0x40000000 572 #define EXT4_EX_FORCE_CACHE 0x20000000 573 574 /* 575 * Flags used by ext4_free_blocks 576 */ 577 #define EXT4_FREE_BLOCKS_METADATA 0x0001 578 #define EXT4_FREE_BLOCKS_FORGET 0x0002 579 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 580 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 581 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 582 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 583 584 /* Encryption algorithms */ 585 #define EXT4_ENCRYPTION_MODE_INVALID 0 586 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 587 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 588 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 589 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 590 591 #include "ext4_crypto.h" 592 593 /* 594 * ioctl commands 595 */ 596 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 597 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 598 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 599 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 600 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 601 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 602 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 603 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 604 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 605 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 606 #define EXT4_IOC_MIGRATE _IO('f', 9) 607 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 608 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 609 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 610 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 611 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 612 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 613 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 614 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 615 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 616 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 617 618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 619 /* 620 * ioctl commands in 32 bit emulation 621 */ 622 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 623 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 624 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 625 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 626 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 627 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 628 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 629 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 630 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 631 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 632 #endif 633 634 /* Max physical block we can address w/o extents */ 635 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 636 637 /* 638 * Structure of an inode on the disk 639 */ 640 struct ext4_inode { 641 __le16 i_mode; /* File mode */ 642 __le16 i_uid; /* Low 16 bits of Owner Uid */ 643 __le32 i_size_lo; /* Size in bytes */ 644 __le32 i_atime; /* Access time */ 645 __le32 i_ctime; /* Inode Change time */ 646 __le32 i_mtime; /* Modification time */ 647 __le32 i_dtime; /* Deletion Time */ 648 __le16 i_gid; /* Low 16 bits of Group Id */ 649 __le16 i_links_count; /* Links count */ 650 __le32 i_blocks_lo; /* Blocks count */ 651 __le32 i_flags; /* File flags */ 652 union { 653 struct { 654 __le32 l_i_version; 655 } linux1; 656 struct { 657 __u32 h_i_translator; 658 } hurd1; 659 struct { 660 __u32 m_i_reserved1; 661 } masix1; 662 } osd1; /* OS dependent 1 */ 663 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 664 __le32 i_generation; /* File version (for NFS) */ 665 __le32 i_file_acl_lo; /* File ACL */ 666 __le32 i_size_high; 667 __le32 i_obso_faddr; /* Obsoleted fragment address */ 668 union { 669 struct { 670 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 671 __le16 l_i_file_acl_high; 672 __le16 l_i_uid_high; /* these 2 fields */ 673 __le16 l_i_gid_high; /* were reserved2[0] */ 674 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 675 __le16 l_i_reserved; 676 } linux2; 677 struct { 678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 679 __u16 h_i_mode_high; 680 __u16 h_i_uid_high; 681 __u16 h_i_gid_high; 682 __u32 h_i_author; 683 } hurd2; 684 struct { 685 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 686 __le16 m_i_file_acl_high; 687 __u32 m_i_reserved2[2]; 688 } masix2; 689 } osd2; /* OS dependent 2 */ 690 __le16 i_extra_isize; 691 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 692 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 693 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 694 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 695 __le32 i_crtime; /* File Creation time */ 696 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 697 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 698 __le32 i_projid; /* Project ID */ 699 }; 700 701 struct move_extent { 702 __u32 reserved; /* should be zero */ 703 __u32 donor_fd; /* donor file descriptor */ 704 __u64 orig_start; /* logical start offset in block for orig */ 705 __u64 donor_start; /* logical start offset in block for donor */ 706 __u64 len; /* block length to be moved */ 707 __u64 moved_len; /* moved block length */ 708 }; 709 710 #define EXT4_EPOCH_BITS 2 711 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 712 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 713 714 /* 715 * Extended fields will fit into an inode if the filesystem was formatted 716 * with large inodes (-I 256 or larger) and there are not currently any EAs 717 * consuming all of the available space. For new inodes we always reserve 718 * enough space for the kernel's known extended fields, but for inodes 719 * created with an old kernel this might not have been the case. None of 720 * the extended inode fields is critical for correct filesystem operation. 721 * This macro checks if a certain field fits in the inode. Note that 722 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 723 */ 724 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 725 ((offsetof(typeof(*ext4_inode), field) + \ 726 sizeof((ext4_inode)->field)) \ 727 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 728 (einode)->i_extra_isize)) \ 729 730 static inline __le32 ext4_encode_extra_time(struct timespec *time) 731 { 732 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 733 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 734 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 735 } 736 737 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 738 { 739 if (sizeof(time->tv_sec) > 4) 740 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 741 << 32; 742 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 743 } 744 745 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 746 do { \ 747 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 748 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 749 (raw_inode)->xtime ## _extra = \ 750 ext4_encode_extra_time(&(inode)->xtime); \ 751 } while (0) 752 753 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 754 do { \ 755 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 756 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 758 (raw_inode)->xtime ## _extra = \ 759 ext4_encode_extra_time(&(einode)->xtime); \ 760 } while (0) 761 762 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 763 do { \ 764 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 765 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 766 ext4_decode_extra_time(&(inode)->xtime, \ 767 raw_inode->xtime ## _extra); \ 768 else \ 769 (inode)->xtime.tv_nsec = 0; \ 770 } while (0) 771 772 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 773 do { \ 774 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 775 (einode)->xtime.tv_sec = \ 776 (signed)le32_to_cpu((raw_inode)->xtime); \ 777 else \ 778 (einode)->xtime.tv_sec = 0; \ 779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 780 ext4_decode_extra_time(&(einode)->xtime, \ 781 raw_inode->xtime ## _extra); \ 782 else \ 783 (einode)->xtime.tv_nsec = 0; \ 784 } while (0) 785 786 #define i_disk_version osd1.linux1.l_i_version 787 788 #if defined(__KERNEL__) || defined(__linux__) 789 #define i_reserved1 osd1.linux1.l_i_reserved1 790 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 791 #define i_blocks_high osd2.linux2.l_i_blocks_high 792 #define i_uid_low i_uid 793 #define i_gid_low i_gid 794 #define i_uid_high osd2.linux2.l_i_uid_high 795 #define i_gid_high osd2.linux2.l_i_gid_high 796 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 797 798 #elif defined(__GNU__) 799 800 #define i_translator osd1.hurd1.h_i_translator 801 #define i_uid_high osd2.hurd2.h_i_uid_high 802 #define i_gid_high osd2.hurd2.h_i_gid_high 803 #define i_author osd2.hurd2.h_i_author 804 805 #elif defined(__masix__) 806 807 #define i_reserved1 osd1.masix1.m_i_reserved1 808 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 809 #define i_reserved2 osd2.masix2.m_i_reserved2 810 811 #endif /* defined(__KERNEL__) || defined(__linux__) */ 812 813 #include "extents_status.h" 814 815 /* 816 * fourth extended file system inode data in memory 817 */ 818 struct ext4_inode_info { 819 __le32 i_data[15]; /* unconverted */ 820 __u32 i_dtime; 821 ext4_fsblk_t i_file_acl; 822 823 /* 824 * i_block_group is the number of the block group which contains 825 * this file's inode. Constant across the lifetime of the inode, 826 * it is ued for making block allocation decisions - we try to 827 * place a file's data blocks near its inode block, and new inodes 828 * near to their parent directory's inode. 829 */ 830 ext4_group_t i_block_group; 831 ext4_lblk_t i_dir_start_lookup; 832 #if (BITS_PER_LONG < 64) 833 unsigned long i_state_flags; /* Dynamic state flags */ 834 #endif 835 unsigned long i_flags; 836 837 /* 838 * Extended attributes can be read independently of the main file 839 * data. Taking i_mutex even when reading would cause contention 840 * between readers of EAs and writers of regular file data, so 841 * instead we synchronize on xattr_sem when reading or changing 842 * EAs. 843 */ 844 struct rw_semaphore xattr_sem; 845 846 struct list_head i_orphan; /* unlinked but open inodes */ 847 848 /* 849 * i_disksize keeps track of what the inode size is ON DISK, not 850 * in memory. During truncate, i_size is set to the new size by 851 * the VFS prior to calling ext4_truncate(), but the filesystem won't 852 * set i_disksize to 0 until the truncate is actually under way. 853 * 854 * The intent is that i_disksize always represents the blocks which 855 * are used by this file. This allows recovery to restart truncate 856 * on orphans if we crash during truncate. We actually write i_disksize 857 * into the on-disk inode when writing inodes out, instead of i_size. 858 * 859 * The only time when i_disksize and i_size may be different is when 860 * a truncate is in progress. The only things which change i_disksize 861 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 862 */ 863 loff_t i_disksize; 864 865 /* 866 * i_data_sem is for serialising ext4_truncate() against 867 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 868 * data tree are chopped off during truncate. We can't do that in 869 * ext4 because whenever we perform intermediate commits during 870 * truncate, the inode and all the metadata blocks *must* be in a 871 * consistent state which allows truncation of the orphans to restart 872 * during recovery. Hence we must fix the get_block-vs-truncate race 873 * by other means, so we have i_data_sem. 874 */ 875 struct rw_semaphore i_data_sem; 876 struct inode vfs_inode; 877 struct jbd2_inode *jinode; 878 879 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 880 881 /* 882 * File creation time. Its function is same as that of 883 * struct timespec i_{a,c,m}time in the generic inode. 884 */ 885 struct timespec i_crtime; 886 887 /* mballoc */ 888 struct list_head i_prealloc_list; 889 spinlock_t i_prealloc_lock; 890 891 /* extents status tree */ 892 struct ext4_es_tree i_es_tree; 893 rwlock_t i_es_lock; 894 struct list_head i_es_list; 895 unsigned int i_es_all_nr; /* protected by i_es_lock */ 896 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 897 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 898 extents to shrink. Protected by 899 i_es_lock */ 900 901 /* ialloc */ 902 ext4_group_t i_last_alloc_group; 903 904 /* allocation reservation info for delalloc */ 905 /* In case of bigalloc, these refer to clusters rather than blocks */ 906 unsigned int i_reserved_data_blocks; 907 unsigned int i_reserved_meta_blocks; 908 unsigned int i_allocated_meta_blocks; 909 ext4_lblk_t i_da_metadata_calc_last_lblock; 910 int i_da_metadata_calc_len; 911 912 /* on-disk additional length */ 913 __u16 i_extra_isize; 914 915 /* Indicate the inline data space. */ 916 u16 i_inline_off; 917 u16 i_inline_size; 918 919 #ifdef CONFIG_QUOTA 920 /* quota space reservation, managed internally by quota code */ 921 qsize_t i_reserved_quota; 922 #endif 923 924 /* Lock protecting lists below */ 925 spinlock_t i_completed_io_lock; 926 /* 927 * Completed IOs that need unwritten extents handling and have 928 * transaction reserved 929 */ 930 struct list_head i_rsv_conversion_list; 931 /* 932 * Completed IOs that need unwritten extents handling and don't have 933 * transaction reserved 934 */ 935 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 936 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 937 struct work_struct i_rsv_conversion_work; 938 939 spinlock_t i_block_reservation_lock; 940 941 /* 942 * Transactions that contain inode's metadata needed to complete 943 * fsync and fdatasync, respectively. 944 */ 945 tid_t i_sync_tid; 946 tid_t i_datasync_tid; 947 948 #ifdef CONFIG_QUOTA 949 struct dquot *i_dquot[MAXQUOTAS]; 950 #endif 951 952 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 953 __u32 i_csum_seed; 954 955 #ifdef CONFIG_EXT4_FS_ENCRYPTION 956 /* Encryption params */ 957 struct ext4_crypt_info *i_crypt_info; 958 #endif 959 }; 960 961 /* 962 * File system states 963 */ 964 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 965 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 966 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 967 968 /* 969 * Misc. filesystem flags 970 */ 971 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 972 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 973 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 974 975 /* 976 * Mount flags set via mount options or defaults 977 */ 978 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 979 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 980 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 981 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 982 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 983 #define EXT4_MOUNT_ERRORS_MASK 0x00070 984 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 985 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 986 #ifdef CONFIG_FS_DAX 987 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 988 #else 989 #define EXT4_MOUNT_DAX 0 990 #endif 991 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 992 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 993 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 994 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 995 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 996 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 997 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 998 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 999 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1000 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1001 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1002 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1003 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1004 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1005 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1006 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1007 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1008 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1009 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1010 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1011 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1012 1013 /* 1014 * Mount flags set either automatically (could not be set by mount option) 1015 * based on per file system feature or property or in special cases such as 1016 * distinguishing between explicit mount option definition and default. 1017 */ 1018 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1019 specified delalloc */ 1020 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1021 size of blocksize * 8 1022 blocks */ 1023 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1024 file systems */ 1025 1026 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1027 ~EXT4_MOUNT_##opt 1028 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1029 EXT4_MOUNT_##opt 1030 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1031 EXT4_MOUNT_##opt) 1032 1033 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1034 ~EXT4_MOUNT2_##opt 1035 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1036 EXT4_MOUNT2_##opt 1037 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1038 EXT4_MOUNT2_##opt) 1039 1040 #define ext4_test_and_set_bit __test_and_set_bit_le 1041 #define ext4_set_bit __set_bit_le 1042 #define ext4_set_bit_atomic ext2_set_bit_atomic 1043 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1044 #define ext4_clear_bit __clear_bit_le 1045 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1046 #define ext4_test_bit test_bit_le 1047 #define ext4_find_next_zero_bit find_next_zero_bit_le 1048 #define ext4_find_next_bit find_next_bit_le 1049 1050 extern void ext4_set_bits(void *bm, int cur, int len); 1051 1052 /* 1053 * Maximal mount counts between two filesystem checks 1054 */ 1055 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1056 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1057 1058 /* 1059 * Behaviour when detecting errors 1060 */ 1061 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1062 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1063 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1064 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1065 1066 /* Metadata checksum algorithm codes */ 1067 #define EXT4_CRC32C_CHKSUM 1 1068 1069 /* 1070 * Structure of the super block 1071 */ 1072 struct ext4_super_block { 1073 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1074 __le32 s_blocks_count_lo; /* Blocks count */ 1075 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1076 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1077 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1078 __le32 s_first_data_block; /* First Data Block */ 1079 __le32 s_log_block_size; /* Block size */ 1080 __le32 s_log_cluster_size; /* Allocation cluster size */ 1081 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1082 __le32 s_clusters_per_group; /* # Clusters per group */ 1083 __le32 s_inodes_per_group; /* # Inodes per group */ 1084 __le32 s_mtime; /* Mount time */ 1085 /*30*/ __le32 s_wtime; /* Write time */ 1086 __le16 s_mnt_count; /* Mount count */ 1087 __le16 s_max_mnt_count; /* Maximal mount count */ 1088 __le16 s_magic; /* Magic signature */ 1089 __le16 s_state; /* File system state */ 1090 __le16 s_errors; /* Behaviour when detecting errors */ 1091 __le16 s_minor_rev_level; /* minor revision level */ 1092 /*40*/ __le32 s_lastcheck; /* time of last check */ 1093 __le32 s_checkinterval; /* max. time between checks */ 1094 __le32 s_creator_os; /* OS */ 1095 __le32 s_rev_level; /* Revision level */ 1096 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1097 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1098 /* 1099 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1100 * 1101 * Note: the difference between the compatible feature set and 1102 * the incompatible feature set is that if there is a bit set 1103 * in the incompatible feature set that the kernel doesn't 1104 * know about, it should refuse to mount the filesystem. 1105 * 1106 * e2fsck's requirements are more strict; if it doesn't know 1107 * about a feature in either the compatible or incompatible 1108 * feature set, it must abort and not try to meddle with 1109 * things it doesn't understand... 1110 */ 1111 __le32 s_first_ino; /* First non-reserved inode */ 1112 __le16 s_inode_size; /* size of inode structure */ 1113 __le16 s_block_group_nr; /* block group # of this superblock */ 1114 __le32 s_feature_compat; /* compatible feature set */ 1115 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1116 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1117 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1118 /*78*/ char s_volume_name[16]; /* volume name */ 1119 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1120 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1121 /* 1122 * Performance hints. Directory preallocation should only 1123 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1124 */ 1125 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1126 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1127 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1128 /* 1129 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1130 */ 1131 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1132 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1133 __le32 s_journal_dev; /* device number of journal file */ 1134 __le32 s_last_orphan; /* start of list of inodes to delete */ 1135 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1136 __u8 s_def_hash_version; /* Default hash version to use */ 1137 __u8 s_jnl_backup_type; 1138 __le16 s_desc_size; /* size of group descriptor */ 1139 /*100*/ __le32 s_default_mount_opts; 1140 __le32 s_first_meta_bg; /* First metablock block group */ 1141 __le32 s_mkfs_time; /* When the filesystem was created */ 1142 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1143 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1144 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1145 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1146 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1147 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1148 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1149 __le32 s_flags; /* Miscellaneous flags */ 1150 __le16 s_raid_stride; /* RAID stride */ 1151 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1152 __le64 s_mmp_block; /* Block for multi-mount protection */ 1153 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1154 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1155 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1156 __u8 s_encryption_level; /* versioning level for encryption */ 1157 __u8 s_reserved_pad; /* Padding to next 32bits */ 1158 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1159 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1160 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1161 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1162 snapshot's future use */ 1163 __le32 s_snapshot_list; /* inode number of the head of the 1164 on-disk snapshot list */ 1165 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1166 __le32 s_error_count; /* number of fs errors */ 1167 __le32 s_first_error_time; /* first time an error happened */ 1168 __le32 s_first_error_ino; /* inode involved in first error */ 1169 __le64 s_first_error_block; /* block involved of first error */ 1170 __u8 s_first_error_func[32]; /* function where the error happened */ 1171 __le32 s_first_error_line; /* line number where error happened */ 1172 __le32 s_last_error_time; /* most recent time of an error */ 1173 __le32 s_last_error_ino; /* inode involved in last error */ 1174 __le32 s_last_error_line; /* line number where error happened */ 1175 __le64 s_last_error_block; /* block involved of last error */ 1176 __u8 s_last_error_func[32]; /* function where the error happened */ 1177 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1178 __u8 s_mount_opts[64]; 1179 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1180 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1181 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1182 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1183 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1184 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1185 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1186 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1187 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1188 __le32 s_reserved[98]; /* Padding to the end of the block */ 1189 __le32 s_checksum; /* crc32c(superblock) */ 1190 }; 1191 1192 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1193 1194 #ifdef __KERNEL__ 1195 1196 /* 1197 * run-time mount flags 1198 */ 1199 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1200 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1201 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1202 1203 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1204 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1205 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1206 #else 1207 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1208 #endif 1209 1210 /* Number of quota types we support */ 1211 #define EXT4_MAXQUOTAS 2 1212 1213 /* 1214 * fourth extended-fs super-block data in memory 1215 */ 1216 struct ext4_sb_info { 1217 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1218 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1219 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1220 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1221 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1222 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1223 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1224 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1225 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1226 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1227 unsigned long s_overhead; /* # of fs overhead clusters */ 1228 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1229 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1230 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1231 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1232 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1233 struct buffer_head **s_group_desc; 1234 unsigned int s_mount_opt; 1235 unsigned int s_mount_opt2; 1236 unsigned int s_mount_flags; 1237 unsigned int s_def_mount_opt; 1238 ext4_fsblk_t s_sb_block; 1239 atomic64_t s_resv_clusters; 1240 kuid_t s_resuid; 1241 kgid_t s_resgid; 1242 unsigned short s_mount_state; 1243 unsigned short s_pad; 1244 int s_addr_per_block_bits; 1245 int s_desc_per_block_bits; 1246 int s_inode_size; 1247 int s_first_ino; 1248 unsigned int s_inode_readahead_blks; 1249 unsigned int s_inode_goal; 1250 spinlock_t s_next_gen_lock; 1251 u32 s_next_generation; 1252 u32 s_hash_seed[4]; 1253 int s_def_hash_version; 1254 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1255 struct percpu_counter s_freeclusters_counter; 1256 struct percpu_counter s_freeinodes_counter; 1257 struct percpu_counter s_dirs_counter; 1258 struct percpu_counter s_dirtyclusters_counter; 1259 struct blockgroup_lock *s_blockgroup_lock; 1260 struct proc_dir_entry *s_proc; 1261 struct kobject s_kobj; 1262 struct completion s_kobj_unregister; 1263 struct super_block *s_sb; 1264 1265 /* Journaling */ 1266 struct journal_s *s_journal; 1267 struct list_head s_orphan; 1268 struct mutex s_orphan_lock; 1269 unsigned long s_resize_flags; /* Flags indicating if there 1270 is a resizer */ 1271 unsigned long s_commit_interval; 1272 u32 s_max_batch_time; 1273 u32 s_min_batch_time; 1274 struct block_device *journal_bdev; 1275 #ifdef CONFIG_QUOTA 1276 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1277 int s_jquota_fmt; /* Format of quota to use */ 1278 #endif 1279 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1280 struct rb_root system_blks; 1281 1282 #ifdef EXTENTS_STATS 1283 /* ext4 extents stats */ 1284 unsigned long s_ext_min; 1285 unsigned long s_ext_max; 1286 unsigned long s_depth_max; 1287 spinlock_t s_ext_stats_lock; 1288 unsigned long s_ext_blocks; 1289 unsigned long s_ext_extents; 1290 #endif 1291 1292 /* for buddy allocator */ 1293 struct ext4_group_info ***s_group_info; 1294 struct inode *s_buddy_cache; 1295 spinlock_t s_md_lock; 1296 unsigned short *s_mb_offsets; 1297 unsigned int *s_mb_maxs; 1298 unsigned int s_group_info_size; 1299 1300 /* tunables */ 1301 unsigned long s_stripe; 1302 unsigned int s_mb_stream_request; 1303 unsigned int s_mb_max_to_scan; 1304 unsigned int s_mb_min_to_scan; 1305 unsigned int s_mb_stats; 1306 unsigned int s_mb_order2_reqs; 1307 unsigned int s_mb_group_prealloc; 1308 unsigned int s_max_dir_size_kb; 1309 /* where last allocation was done - for stream allocation */ 1310 unsigned long s_mb_last_group; 1311 unsigned long s_mb_last_start; 1312 1313 /* stats for buddy allocator */ 1314 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1315 atomic_t s_bal_success; /* we found long enough chunks */ 1316 atomic_t s_bal_allocated; /* in blocks */ 1317 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1318 atomic_t s_bal_goals; /* goal hits */ 1319 atomic_t s_bal_breaks; /* too long searches */ 1320 atomic_t s_bal_2orders; /* 2^order hits */ 1321 spinlock_t s_bal_lock; 1322 unsigned long s_mb_buddies_generated; 1323 unsigned long long s_mb_generation_time; 1324 atomic_t s_mb_lost_chunks; 1325 atomic_t s_mb_preallocated; 1326 atomic_t s_mb_discarded; 1327 atomic_t s_lock_busy; 1328 1329 /* locality groups */ 1330 struct ext4_locality_group __percpu *s_locality_groups; 1331 1332 /* for write statistics */ 1333 unsigned long s_sectors_written_start; 1334 u64 s_kbytes_written; 1335 1336 /* the size of zero-out chunk */ 1337 unsigned int s_extent_max_zeroout_kb; 1338 1339 unsigned int s_log_groups_per_flex; 1340 struct flex_groups *s_flex_groups; 1341 ext4_group_t s_flex_groups_allocated; 1342 1343 /* workqueue for reserved extent conversions (buffered io) */ 1344 struct workqueue_struct *rsv_conversion_wq; 1345 1346 /* timer for periodic error stats printing */ 1347 struct timer_list s_err_report; 1348 1349 /* Lazy inode table initialization info */ 1350 struct ext4_li_request *s_li_request; 1351 /* Wait multiplier for lazy initialization thread */ 1352 unsigned int s_li_wait_mult; 1353 1354 /* Kernel thread for multiple mount protection */ 1355 struct task_struct *s_mmp_tsk; 1356 1357 /* record the last minlen when FITRIM is called. */ 1358 atomic_t s_last_trim_minblks; 1359 1360 /* Reference to checksum algorithm driver via cryptoapi */ 1361 struct crypto_shash *s_chksum_driver; 1362 1363 /* Precomputed FS UUID checksum for seeding other checksums */ 1364 __u32 s_csum_seed; 1365 1366 /* Reclaim extents from extent status tree */ 1367 struct shrinker s_es_shrinker; 1368 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1369 long s_es_nr_inode; 1370 struct ext4_es_stats s_es_stats; 1371 struct mb_cache *s_mb_cache; 1372 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1373 1374 /* Ratelimit ext4 messages. */ 1375 struct ratelimit_state s_err_ratelimit_state; 1376 struct ratelimit_state s_warning_ratelimit_state; 1377 struct ratelimit_state s_msg_ratelimit_state; 1378 }; 1379 1380 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1381 { 1382 return sb->s_fs_info; 1383 } 1384 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1385 { 1386 return container_of(inode, struct ext4_inode_info, vfs_inode); 1387 } 1388 1389 static inline struct timespec ext4_current_time(struct inode *inode) 1390 { 1391 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1392 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1393 } 1394 1395 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1396 { 1397 return ino == EXT4_ROOT_INO || 1398 ino == EXT4_USR_QUOTA_INO || 1399 ino == EXT4_GRP_QUOTA_INO || 1400 ino == EXT4_BOOT_LOADER_INO || 1401 ino == EXT4_JOURNAL_INO || 1402 ino == EXT4_RESIZE_INO || 1403 (ino >= EXT4_FIRST_INO(sb) && 1404 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1405 } 1406 1407 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1408 struct ext4_io_end *io_end) 1409 { 1410 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1411 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1412 atomic_inc(&EXT4_I(inode)->i_unwritten); 1413 } 1414 } 1415 1416 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1417 { 1418 return inode->i_private; 1419 } 1420 1421 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1422 { 1423 inode->i_private = io; 1424 } 1425 1426 /* 1427 * Inode dynamic state flags 1428 */ 1429 enum { 1430 EXT4_STATE_JDATA, /* journaled data exists */ 1431 EXT4_STATE_NEW, /* inode is newly created */ 1432 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1433 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1434 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1435 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1436 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1437 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1438 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1439 nolocking */ 1440 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1441 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1442 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1443 }; 1444 1445 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1446 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1447 { \ 1448 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1449 } \ 1450 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1451 { \ 1452 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1453 } \ 1454 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1455 { \ 1456 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1457 } 1458 1459 /* Add these declarations here only so that these functions can be 1460 * found by name. Otherwise, they are very hard to locate. */ 1461 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1462 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1463 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1464 EXT4_INODE_BIT_FNS(flag, flags, 0) 1465 1466 /* Add these declarations here only so that these functions can be 1467 * found by name. Otherwise, they are very hard to locate. */ 1468 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1469 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1470 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1471 #if (BITS_PER_LONG < 64) 1472 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1473 1474 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1475 { 1476 (ei)->i_state_flags = 0; 1477 } 1478 #else 1479 EXT4_INODE_BIT_FNS(state, flags, 32) 1480 1481 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1482 { 1483 /* We depend on the fact that callers will set i_flags */ 1484 } 1485 #endif 1486 #else 1487 /* Assume that user mode programs are passing in an ext4fs superblock, not 1488 * a kernel struct super_block. This will allow us to call the feature-test 1489 * macros from user land. */ 1490 #define EXT4_SB(sb) (sb) 1491 #endif 1492 1493 /* 1494 * Returns true if the inode is inode is encrypted 1495 */ 1496 static inline int ext4_encrypted_inode(struct inode *inode) 1497 { 1498 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1499 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1500 #else 1501 return 0; 1502 #endif 1503 } 1504 1505 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1506 1507 /* 1508 * Codes for operating systems 1509 */ 1510 #define EXT4_OS_LINUX 0 1511 #define EXT4_OS_HURD 1 1512 #define EXT4_OS_MASIX 2 1513 #define EXT4_OS_FREEBSD 3 1514 #define EXT4_OS_LITES 4 1515 1516 /* 1517 * Revision levels 1518 */ 1519 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1520 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1521 1522 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1523 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1524 1525 #define EXT4_GOOD_OLD_INODE_SIZE 128 1526 1527 /* 1528 * Feature set definitions 1529 */ 1530 1531 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */ 1532 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1533 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1534 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1535 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1536 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1537 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1538 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1539 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1540 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1541 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1542 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1543 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1544 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1545 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1546 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1547 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1548 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1549 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1550 1551 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1552 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1553 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1554 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1555 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1556 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1557 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1558 1559 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1560 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1561 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1562 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1563 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1564 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1565 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1566 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1567 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1568 /* 1569 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1570 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1571 * all other data structures' checksums. However, the METADATA_CSUM and 1572 * GDT_CSUM bits are mutually exclusive. 1573 */ 1574 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1575 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1576 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1577 1578 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1579 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1580 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1581 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1582 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1583 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1584 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1585 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1586 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1587 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1588 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1589 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1590 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1591 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1592 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1593 1594 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1595 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1596 { \ 1597 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1598 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1599 } \ 1600 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1601 { \ 1602 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1603 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1604 } \ 1605 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1606 { \ 1607 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1608 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1609 } 1610 1611 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1612 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1613 { \ 1614 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1615 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1616 } \ 1617 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1618 { \ 1619 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1620 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1621 } \ 1622 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1623 { \ 1624 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1625 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1626 } 1627 1628 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1629 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1630 { \ 1631 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1632 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1633 } \ 1634 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1635 { \ 1636 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1637 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1638 } \ 1639 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1640 { \ 1641 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1642 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1643 } 1644 1645 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1646 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1647 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1648 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1649 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1650 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1651 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1652 1653 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1654 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1655 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1656 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1657 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1658 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1659 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1660 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1661 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1662 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1663 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1664 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1665 1666 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1667 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1668 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1669 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1670 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1671 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1672 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1673 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1674 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1675 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1676 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1677 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1678 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1679 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1680 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1681 1682 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1683 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1684 EXT4_FEATURE_INCOMPAT_META_BG) 1685 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1686 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1687 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1688 1689 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1690 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1691 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1692 EXT4_FEATURE_INCOMPAT_META_BG) 1693 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1694 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1695 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1696 1697 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1698 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1699 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1700 EXT4_FEATURE_INCOMPAT_META_BG| \ 1701 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1702 EXT4_FEATURE_INCOMPAT_64BIT| \ 1703 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1704 EXT4_FEATURE_INCOMPAT_MMP | \ 1705 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1706 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1707 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1708 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1709 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1710 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1711 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1712 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1713 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1714 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1715 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1716 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1717 EXT4_FEATURE_RO_COMPAT_QUOTA) 1718 1719 #define EXTN_FEATURE_FUNCS(ver) \ 1720 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1721 { \ 1722 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1723 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1724 } \ 1725 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1726 { \ 1727 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1728 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1729 } \ 1730 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1731 { \ 1732 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1733 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1734 } 1735 1736 EXTN_FEATURE_FUNCS(2) 1737 EXTN_FEATURE_FUNCS(3) 1738 EXTN_FEATURE_FUNCS(4) 1739 1740 static inline bool ext4_has_compat_features(struct super_block *sb) 1741 { 1742 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1743 } 1744 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1745 { 1746 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1747 } 1748 static inline bool ext4_has_incompat_features(struct super_block *sb) 1749 { 1750 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1751 } 1752 1753 /* 1754 * Default values for user and/or group using reserved blocks 1755 */ 1756 #define EXT4_DEF_RESUID 0 1757 #define EXT4_DEF_RESGID 0 1758 1759 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1760 1761 /* 1762 * Default mount options 1763 */ 1764 #define EXT4_DEFM_DEBUG 0x0001 1765 #define EXT4_DEFM_BSDGROUPS 0x0002 1766 #define EXT4_DEFM_XATTR_USER 0x0004 1767 #define EXT4_DEFM_ACL 0x0008 1768 #define EXT4_DEFM_UID16 0x0010 1769 #define EXT4_DEFM_JMODE 0x0060 1770 #define EXT4_DEFM_JMODE_DATA 0x0020 1771 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1772 #define EXT4_DEFM_JMODE_WBACK 0x0060 1773 #define EXT4_DEFM_NOBARRIER 0x0100 1774 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1775 #define EXT4_DEFM_DISCARD 0x0400 1776 #define EXT4_DEFM_NODELALLOC 0x0800 1777 1778 /* 1779 * Default journal batch times 1780 */ 1781 #define EXT4_DEF_MIN_BATCH_TIME 0 1782 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1783 1784 /* 1785 * Minimum number of groups in a flexgroup before we separate out 1786 * directories into the first block group of a flexgroup 1787 */ 1788 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1789 1790 /* 1791 * Structure of a directory entry 1792 */ 1793 #define EXT4_NAME_LEN 255 1794 1795 struct ext4_dir_entry { 1796 __le32 inode; /* Inode number */ 1797 __le16 rec_len; /* Directory entry length */ 1798 __le16 name_len; /* Name length */ 1799 char name[EXT4_NAME_LEN]; /* File name */ 1800 }; 1801 1802 /* 1803 * The new version of the directory entry. Since EXT4 structures are 1804 * stored in intel byte order, and the name_len field could never be 1805 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1806 * file_type field. 1807 */ 1808 struct ext4_dir_entry_2 { 1809 __le32 inode; /* Inode number */ 1810 __le16 rec_len; /* Directory entry length */ 1811 __u8 name_len; /* Name length */ 1812 __u8 file_type; 1813 char name[EXT4_NAME_LEN]; /* File name */ 1814 }; 1815 1816 /* 1817 * This is a bogus directory entry at the end of each leaf block that 1818 * records checksums. 1819 */ 1820 struct ext4_dir_entry_tail { 1821 __le32 det_reserved_zero1; /* Pretend to be unused */ 1822 __le16 det_rec_len; /* 12 */ 1823 __u8 det_reserved_zero2; /* Zero name length */ 1824 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1825 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1826 }; 1827 1828 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1829 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1830 ((blocksize) - \ 1831 sizeof(struct ext4_dir_entry_tail)))) 1832 1833 /* 1834 * Ext4 directory file types. Only the low 3 bits are used. The 1835 * other bits are reserved for now. 1836 */ 1837 #define EXT4_FT_UNKNOWN 0 1838 #define EXT4_FT_REG_FILE 1 1839 #define EXT4_FT_DIR 2 1840 #define EXT4_FT_CHRDEV 3 1841 #define EXT4_FT_BLKDEV 4 1842 #define EXT4_FT_FIFO 5 1843 #define EXT4_FT_SOCK 6 1844 #define EXT4_FT_SYMLINK 7 1845 1846 #define EXT4_FT_MAX 8 1847 1848 #define EXT4_FT_DIR_CSUM 0xDE 1849 1850 /* 1851 * EXT4_DIR_PAD defines the directory entries boundaries 1852 * 1853 * NOTE: It must be a multiple of 4 1854 */ 1855 #define EXT4_DIR_PAD 4 1856 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1857 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1858 ~EXT4_DIR_ROUND) 1859 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1860 1861 /* 1862 * If we ever get support for fs block sizes > page_size, we'll need 1863 * to remove the #if statements in the next two functions... 1864 */ 1865 static inline unsigned int 1866 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1867 { 1868 unsigned len = le16_to_cpu(dlen); 1869 1870 #if (PAGE_CACHE_SIZE >= 65536) 1871 if (len == EXT4_MAX_REC_LEN || len == 0) 1872 return blocksize; 1873 return (len & 65532) | ((len & 3) << 16); 1874 #else 1875 return len; 1876 #endif 1877 } 1878 1879 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1880 { 1881 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1882 BUG(); 1883 #if (PAGE_CACHE_SIZE >= 65536) 1884 if (len < 65536) 1885 return cpu_to_le16(len); 1886 if (len == blocksize) { 1887 if (blocksize == 65536) 1888 return cpu_to_le16(EXT4_MAX_REC_LEN); 1889 else 1890 return cpu_to_le16(0); 1891 } 1892 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1893 #else 1894 return cpu_to_le16(len); 1895 #endif 1896 } 1897 1898 /* 1899 * Hash Tree Directory indexing 1900 * (c) Daniel Phillips, 2001 1901 */ 1902 1903 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 1904 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1905 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1906 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1907 1908 /* Legal values for the dx_root hash_version field: */ 1909 1910 #define DX_HASH_LEGACY 0 1911 #define DX_HASH_HALF_MD4 1 1912 #define DX_HASH_TEA 2 1913 #define DX_HASH_LEGACY_UNSIGNED 3 1914 #define DX_HASH_HALF_MD4_UNSIGNED 4 1915 #define DX_HASH_TEA_UNSIGNED 5 1916 1917 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1918 const void *address, unsigned int length) 1919 { 1920 struct { 1921 struct shash_desc shash; 1922 char ctx[4]; 1923 } desc; 1924 int err; 1925 1926 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1927 1928 desc.shash.tfm = sbi->s_chksum_driver; 1929 desc.shash.flags = 0; 1930 *(u32 *)desc.ctx = crc; 1931 1932 err = crypto_shash_update(&desc.shash, address, length); 1933 BUG_ON(err); 1934 1935 return *(u32 *)desc.ctx; 1936 } 1937 1938 #ifdef __KERNEL__ 1939 1940 /* hash info structure used by the directory hash */ 1941 struct dx_hash_info 1942 { 1943 u32 hash; 1944 u32 minor_hash; 1945 int hash_version; 1946 u32 *seed; 1947 }; 1948 1949 1950 /* 32 and 64 bit signed EOF for dx directories */ 1951 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1952 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1953 1954 1955 /* 1956 * Control parameters used by ext4_htree_next_block 1957 */ 1958 #define HASH_NB_ALWAYS 1 1959 1960 struct ext4_filename { 1961 const struct qstr *usr_fname; 1962 struct ext4_str disk_name; 1963 struct dx_hash_info hinfo; 1964 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1965 struct ext4_str crypto_buf; 1966 #endif 1967 }; 1968 1969 #define fname_name(p) ((p)->disk_name.name) 1970 #define fname_len(p) ((p)->disk_name.len) 1971 1972 /* 1973 * Describe an inode's exact location on disk and in memory 1974 */ 1975 struct ext4_iloc 1976 { 1977 struct buffer_head *bh; 1978 unsigned long offset; 1979 ext4_group_t block_group; 1980 }; 1981 1982 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1983 { 1984 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1985 } 1986 1987 /* 1988 * This structure is stuffed into the struct file's private_data field 1989 * for directories. It is where we put information so that we can do 1990 * readdir operations in hash tree order. 1991 */ 1992 struct dir_private_info { 1993 struct rb_root root; 1994 struct rb_node *curr_node; 1995 struct fname *extra_fname; 1996 loff_t last_pos; 1997 __u32 curr_hash; 1998 __u32 curr_minor_hash; 1999 __u32 next_hash; 2000 }; 2001 2002 /* calculate the first block number of the group */ 2003 static inline ext4_fsblk_t 2004 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2005 { 2006 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2007 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2008 } 2009 2010 /* 2011 * Special error return code only used by dx_probe() and its callers. 2012 */ 2013 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2014 2015 /* 2016 * Timeout and state flag for lazy initialization inode thread. 2017 */ 2018 #define EXT4_DEF_LI_WAIT_MULT 10 2019 #define EXT4_DEF_LI_MAX_START_DELAY 5 2020 #define EXT4_LAZYINIT_QUIT 0x0001 2021 #define EXT4_LAZYINIT_RUNNING 0x0002 2022 2023 /* 2024 * Lazy inode table initialization info 2025 */ 2026 struct ext4_lazy_init { 2027 unsigned long li_state; 2028 struct list_head li_request_list; 2029 struct mutex li_list_mtx; 2030 }; 2031 2032 struct ext4_li_request { 2033 struct super_block *lr_super; 2034 struct ext4_sb_info *lr_sbi; 2035 ext4_group_t lr_next_group; 2036 struct list_head lr_request; 2037 unsigned long lr_next_sched; 2038 unsigned long lr_timeout; 2039 }; 2040 2041 struct ext4_features { 2042 struct kobject f_kobj; 2043 struct completion f_kobj_unregister; 2044 }; 2045 2046 /* 2047 * This structure will be used for multiple mount protection. It will be 2048 * written into the block number saved in the s_mmp_block field in the 2049 * superblock. Programs that check MMP should assume that if 2050 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2051 * to use the filesystem, regardless of how old the timestamp is. 2052 */ 2053 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2054 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2055 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2056 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2057 2058 struct mmp_struct { 2059 __le32 mmp_magic; /* Magic number for MMP */ 2060 __le32 mmp_seq; /* Sequence no. updated periodically */ 2061 2062 /* 2063 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2064 * purposes and do not affect the correctness of the algorithm 2065 */ 2066 __le64 mmp_time; /* Time last updated */ 2067 char mmp_nodename[64]; /* Node which last updated MMP block */ 2068 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2069 2070 /* 2071 * mmp_check_interval is used to verify if the MMP block has been 2072 * updated on the block device. The value is updated based on the 2073 * maximum time to write the MMP block during an update cycle. 2074 */ 2075 __le16 mmp_check_interval; 2076 2077 __le16 mmp_pad1; 2078 __le32 mmp_pad2[226]; 2079 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2080 }; 2081 2082 /* arguments passed to the mmp thread */ 2083 struct mmpd_data { 2084 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2085 struct super_block *sb; /* super block of the fs */ 2086 }; 2087 2088 /* 2089 * Check interval multiplier 2090 * The MMP block is written every update interval and initially checked every 2091 * update interval x the multiplier (the value is then adapted based on the 2092 * write latency). The reason is that writes can be delayed under load and we 2093 * don't want readers to incorrectly assume that the filesystem is no longer 2094 * in use. 2095 */ 2096 #define EXT4_MMP_CHECK_MULT 2UL 2097 2098 /* 2099 * Minimum interval for MMP checking in seconds. 2100 */ 2101 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2102 2103 /* 2104 * Maximum interval for MMP checking in seconds. 2105 */ 2106 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2107 2108 /* 2109 * Function prototypes 2110 */ 2111 2112 /* 2113 * Ok, these declarations are also in <linux/kernel.h> but none of the 2114 * ext4 source programs needs to include it so they are duplicated here. 2115 */ 2116 # define NORET_TYPE /**/ 2117 # define ATTRIB_NORET __attribute__((noreturn)) 2118 # define NORET_AND noreturn, 2119 2120 /* bitmap.c */ 2121 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2122 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2123 struct ext4_group_desc *gdp, 2124 struct buffer_head *bh, int sz); 2125 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2126 struct ext4_group_desc *gdp, 2127 struct buffer_head *bh, int sz); 2128 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2129 struct ext4_group_desc *gdp, 2130 struct buffer_head *bh); 2131 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2132 struct ext4_group_desc *gdp, 2133 struct buffer_head *bh); 2134 2135 /* balloc.c */ 2136 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2137 ext4_fsblk_t blocknr, 2138 ext4_group_t *blockgrpp, 2139 ext4_grpblk_t *offsetp); 2140 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2141 ext4_fsblk_t block); 2142 2143 extern unsigned int ext4_block_group(struct super_block *sb, 2144 ext4_fsblk_t blocknr); 2145 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2146 ext4_fsblk_t blocknr); 2147 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2148 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2149 ext4_group_t group); 2150 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2151 ext4_fsblk_t goal, 2152 unsigned int flags, 2153 unsigned long *count, 2154 int *errp); 2155 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2156 s64 nclusters, unsigned int flags); 2157 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2158 extern void ext4_check_blocks_bitmap(struct super_block *); 2159 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2160 ext4_group_t block_group, 2161 struct buffer_head ** bh); 2162 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2163 2164 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2165 ext4_group_t block_group); 2166 extern int ext4_wait_block_bitmap(struct super_block *sb, 2167 ext4_group_t block_group, 2168 struct buffer_head *bh); 2169 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2170 ext4_group_t block_group); 2171 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2172 ext4_group_t block_group, 2173 struct ext4_group_desc *gdp); 2174 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2175 2176 /* crypto_policy.c */ 2177 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2178 struct inode *child); 2179 int ext4_inherit_context(struct inode *parent, struct inode *child); 2180 void ext4_to_hex(char *dst, char *src, size_t src_size); 2181 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2182 struct inode *inode); 2183 int ext4_get_policy(struct inode *inode, 2184 struct ext4_encryption_policy *policy); 2185 2186 /* crypto.c */ 2187 extern struct kmem_cache *ext4_crypt_info_cachep; 2188 bool ext4_valid_contents_enc_mode(uint32_t mode); 2189 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2190 extern struct workqueue_struct *ext4_read_workqueue; 2191 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); 2192 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2193 void ext4_restore_control_page(struct page *data_page); 2194 struct page *ext4_encrypt(struct inode *inode, 2195 struct page *plaintext_page); 2196 int ext4_decrypt(struct page *page); 2197 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex); 2198 2199 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2200 int ext4_init_crypto(void); 2201 void ext4_exit_crypto(void); 2202 static inline int ext4_sb_has_crypto(struct super_block *sb) 2203 { 2204 return ext4_has_feature_encrypt(sb); 2205 } 2206 #else 2207 static inline int ext4_init_crypto(void) { return 0; } 2208 static inline void ext4_exit_crypto(void) { } 2209 static inline int ext4_sb_has_crypto(struct super_block *sb) 2210 { 2211 return 0; 2212 } 2213 #endif 2214 2215 /* crypto_fname.c */ 2216 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2217 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2218 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); 2219 int ext4_fname_crypto_alloc_buffer(struct inode *inode, 2220 u32 ilen, struct ext4_str *crypto_str); 2221 int _ext4_fname_disk_to_usr(struct inode *inode, 2222 struct dx_hash_info *hinfo, 2223 const struct ext4_str *iname, 2224 struct ext4_str *oname); 2225 int ext4_fname_disk_to_usr(struct inode *inode, 2226 struct dx_hash_info *hinfo, 2227 const struct ext4_dir_entry_2 *de, 2228 struct ext4_str *oname); 2229 int ext4_fname_usr_to_disk(struct inode *inode, 2230 const struct qstr *iname, 2231 struct ext4_str *oname); 2232 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2233 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2234 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2235 int lookup, struct ext4_filename *fname); 2236 void ext4_fname_free_filename(struct ext4_filename *fname); 2237 #else 2238 static inline 2239 int ext4_setup_fname_crypto(struct inode *inode) 2240 { 2241 return 0; 2242 } 2243 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2244 static inline int ext4_fname_setup_filename(struct inode *dir, 2245 const struct qstr *iname, 2246 int lookup, struct ext4_filename *fname) 2247 { 2248 fname->usr_fname = iname; 2249 fname->disk_name.name = (unsigned char *) iname->name; 2250 fname->disk_name.len = iname->len; 2251 return 0; 2252 } 2253 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2254 #endif 2255 2256 2257 /* crypto_key.c */ 2258 void ext4_free_crypt_info(struct ext4_crypt_info *ci); 2259 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); 2260 int _ext4_get_encryption_info(struct inode *inode); 2261 2262 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2263 int ext4_has_encryption_key(struct inode *inode); 2264 2265 static inline int ext4_get_encryption_info(struct inode *inode) 2266 { 2267 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; 2268 2269 if (!ci || 2270 (ci->ci_keyring_key && 2271 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | 2272 (1 << KEY_FLAG_REVOKED) | 2273 (1 << KEY_FLAG_DEAD))))) 2274 return _ext4_get_encryption_info(inode); 2275 return 0; 2276 } 2277 2278 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2279 { 2280 return EXT4_I(inode)->i_crypt_info; 2281 } 2282 2283 #else 2284 static inline int ext4_has_encryption_key(struct inode *inode) 2285 { 2286 return 0; 2287 } 2288 static inline int ext4_get_encryption_info(struct inode *inode) 2289 { 2290 return 0; 2291 } 2292 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2293 { 2294 return NULL; 2295 } 2296 #endif 2297 2298 2299 /* dir.c */ 2300 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2301 struct file *, 2302 struct ext4_dir_entry_2 *, 2303 struct buffer_head *, char *, int, 2304 unsigned int); 2305 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2306 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2307 (de), (bh), (buf), (size), (offset))) 2308 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2309 __u32 minor_hash, 2310 struct ext4_dir_entry_2 *dirent, 2311 struct ext4_str *ent_name); 2312 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2313 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2314 struct buffer_head *bh, 2315 void *buf, int buf_size, 2316 struct ext4_filename *fname, 2317 struct ext4_dir_entry_2 **dest_de); 2318 int ext4_insert_dentry(struct inode *dir, 2319 struct inode *inode, 2320 struct ext4_dir_entry_2 *de, 2321 int buf_size, 2322 struct ext4_filename *fname); 2323 static inline void ext4_update_dx_flag(struct inode *inode) 2324 { 2325 if (!ext4_has_feature_dir_index(inode->i_sb)) 2326 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2327 } 2328 static unsigned char ext4_filetype_table[] = { 2329 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2330 }; 2331 2332 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2333 { 2334 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2335 return DT_UNKNOWN; 2336 2337 return ext4_filetype_table[filetype]; 2338 } 2339 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2340 void *buf, int buf_size); 2341 2342 /* fsync.c */ 2343 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2344 2345 /* hash.c */ 2346 extern int ext4fs_dirhash(const char *name, int len, struct 2347 dx_hash_info *hinfo); 2348 2349 /* ialloc.c */ 2350 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2351 const struct qstr *qstr, __u32 goal, 2352 uid_t *owner, int handle_type, 2353 unsigned int line_no, int nblocks); 2354 2355 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2356 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2357 0, 0, 0) 2358 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2359 type, nblocks) \ 2360 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2361 (type), __LINE__, (nblocks)) 2362 2363 2364 extern void ext4_free_inode(handle_t *, struct inode *); 2365 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2366 extern unsigned long ext4_count_free_inodes(struct super_block *); 2367 extern unsigned long ext4_count_dirs(struct super_block *); 2368 extern void ext4_check_inodes_bitmap(struct super_block *); 2369 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2370 extern int ext4_init_inode_table(struct super_block *sb, 2371 ext4_group_t group, int barrier); 2372 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2373 2374 /* mballoc.c */ 2375 extern const struct file_operations ext4_seq_mb_groups_fops; 2376 extern long ext4_mb_stats; 2377 extern long ext4_mb_max_to_scan; 2378 extern int ext4_mb_init(struct super_block *); 2379 extern int ext4_mb_release(struct super_block *); 2380 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2381 struct ext4_allocation_request *, int *); 2382 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2383 extern void ext4_discard_preallocations(struct inode *); 2384 extern int __init ext4_init_mballoc(void); 2385 extern void ext4_exit_mballoc(void); 2386 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2387 struct buffer_head *bh, ext4_fsblk_t block, 2388 unsigned long count, int flags); 2389 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2390 ext4_group_t ngroups); 2391 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2392 ext4_group_t i, struct ext4_group_desc *desc); 2393 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2394 ext4_fsblk_t block, unsigned long count); 2395 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2396 2397 /* inode.c */ 2398 int ext4_inode_is_fast_symlink(struct inode *inode); 2399 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2400 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2401 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2402 struct buffer_head *bh_result, int create); 2403 int ext4_get_block_dax(struct inode *inode, sector_t iblock, 2404 struct buffer_head *bh_result, int create); 2405 int ext4_get_block(struct inode *inode, sector_t iblock, 2406 struct buffer_head *bh_result, int create); 2407 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2408 struct buffer_head *bh, int create); 2409 int ext4_walk_page_buffers(handle_t *handle, 2410 struct buffer_head *head, 2411 unsigned from, 2412 unsigned to, 2413 int *partial, 2414 int (*fn)(handle_t *handle, 2415 struct buffer_head *bh)); 2416 int do_journal_get_write_access(handle_t *handle, 2417 struct buffer_head *bh); 2418 #define FALL_BACK_TO_NONDELALLOC 1 2419 #define CONVERT_INLINE_DATA 2 2420 2421 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2422 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2423 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2424 extern int ext4_setattr(struct dentry *, struct iattr *); 2425 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2426 struct kstat *stat); 2427 extern void ext4_evict_inode(struct inode *); 2428 extern void ext4_clear_inode(struct inode *); 2429 extern int ext4_sync_inode(handle_t *, struct inode *); 2430 extern void ext4_dirty_inode(struct inode *, int); 2431 extern int ext4_change_inode_journal_flag(struct inode *, int); 2432 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2433 extern int ext4_inode_attach_jinode(struct inode *inode); 2434 extern int ext4_can_truncate(struct inode *inode); 2435 extern void ext4_truncate(struct inode *); 2436 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2437 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2438 extern void ext4_set_inode_flags(struct inode *); 2439 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2440 extern int ext4_alloc_da_blocks(struct inode *inode); 2441 extern void ext4_set_aops(struct inode *inode); 2442 extern int ext4_writepage_trans_blocks(struct inode *); 2443 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2444 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2445 loff_t lstart, loff_t lend); 2446 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2447 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2448 extern void ext4_da_update_reserve_space(struct inode *inode, 2449 int used, int quota_claim); 2450 2451 /* indirect.c */ 2452 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2453 struct ext4_map_blocks *map, int flags); 2454 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 2455 loff_t offset); 2456 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2457 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2458 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2459 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2460 ext4_lblk_t start, ext4_lblk_t end); 2461 2462 /* ioctl.c */ 2463 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2464 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2465 2466 /* migrate.c */ 2467 extern int ext4_ext_migrate(struct inode *); 2468 extern int ext4_ind_migrate(struct inode *inode); 2469 2470 /* namei.c */ 2471 extern int ext4_dirent_csum_verify(struct inode *inode, 2472 struct ext4_dir_entry *dirent); 2473 extern int ext4_orphan_add(handle_t *, struct inode *); 2474 extern int ext4_orphan_del(handle_t *, struct inode *); 2475 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2476 __u32 start_minor_hash, __u32 *next_hash); 2477 extern int ext4_search_dir(struct buffer_head *bh, 2478 char *search_buf, 2479 int buf_size, 2480 struct inode *dir, 2481 struct ext4_filename *fname, 2482 const struct qstr *d_name, 2483 unsigned int offset, 2484 struct ext4_dir_entry_2 **res_dir); 2485 extern int ext4_generic_delete_entry(handle_t *handle, 2486 struct inode *dir, 2487 struct ext4_dir_entry_2 *de_del, 2488 struct buffer_head *bh, 2489 void *entry_buf, 2490 int buf_size, 2491 int csum_size); 2492 extern int ext4_empty_dir(struct inode *inode); 2493 2494 /* resize.c */ 2495 extern int ext4_group_add(struct super_block *sb, 2496 struct ext4_new_group_data *input); 2497 extern int ext4_group_extend(struct super_block *sb, 2498 struct ext4_super_block *es, 2499 ext4_fsblk_t n_blocks_count); 2500 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2501 2502 /* super.c */ 2503 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2504 extern int ext4_calculate_overhead(struct super_block *sb); 2505 extern void ext4_superblock_csum_set(struct super_block *sb); 2506 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2507 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2508 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2509 ext4_group_t ngroup); 2510 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2511 char nbuf[16]); 2512 2513 extern __printf(4, 5) 2514 void __ext4_error(struct super_block *, const char *, unsigned int, 2515 const char *, ...); 2516 extern __printf(5, 6) 2517 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2518 const char *, ...); 2519 extern __printf(5, 6) 2520 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2521 const char *, ...); 2522 extern void __ext4_std_error(struct super_block *, const char *, 2523 unsigned int, int); 2524 extern __printf(4, 5) 2525 void __ext4_abort(struct super_block *, const char *, unsigned int, 2526 const char *, ...); 2527 extern __printf(4, 5) 2528 void __ext4_warning(struct super_block *, const char *, unsigned int, 2529 const char *, ...); 2530 extern __printf(4, 5) 2531 void __ext4_warning_inode(const struct inode *inode, const char *function, 2532 unsigned int line, const char *fmt, ...); 2533 extern __printf(3, 4) 2534 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2535 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2536 const char *, unsigned int, const char *); 2537 extern __printf(7, 8) 2538 void __ext4_grp_locked_error(const char *, unsigned int, 2539 struct super_block *, ext4_group_t, 2540 unsigned long, ext4_fsblk_t, 2541 const char *, ...); 2542 2543 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2544 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2545 2546 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2547 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2548 2549 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2550 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2551 2552 #ifdef CONFIG_PRINTK 2553 2554 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2555 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2556 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2557 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2558 #define ext4_error(sb, fmt, ...) \ 2559 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2560 #define ext4_abort(sb, fmt, ...) \ 2561 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2562 #define ext4_warning(sb, fmt, ...) \ 2563 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2564 #define ext4_warning_inode(inode, fmt, ...) \ 2565 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2566 #define ext4_msg(sb, level, fmt, ...) \ 2567 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2568 #define dump_mmp_msg(sb, mmp, msg) \ 2569 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2570 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2571 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2572 fmt, ##__VA_ARGS__) 2573 2574 #else 2575 2576 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2577 do { \ 2578 no_printk(fmt, ##__VA_ARGS__); \ 2579 __ext4_error_inode(inode, "", 0, block, " "); \ 2580 } while (0) 2581 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2582 do { \ 2583 no_printk(fmt, ##__VA_ARGS__); \ 2584 __ext4_error_file(file, "", 0, block, " "); \ 2585 } while (0) 2586 #define ext4_error(sb, fmt, ...) \ 2587 do { \ 2588 no_printk(fmt, ##__VA_ARGS__); \ 2589 __ext4_error(sb, "", 0, " "); \ 2590 } while (0) 2591 #define ext4_abort(sb, fmt, ...) \ 2592 do { \ 2593 no_printk(fmt, ##__VA_ARGS__); \ 2594 __ext4_abort(sb, "", 0, " "); \ 2595 } while (0) 2596 #define ext4_warning(sb, fmt, ...) \ 2597 do { \ 2598 no_printk(fmt, ##__VA_ARGS__); \ 2599 __ext4_warning(sb, "", 0, " "); \ 2600 } while (0) 2601 #define ext4_warning_inode(inode, fmt, ...) \ 2602 do { \ 2603 no_printk(fmt, ##__VA_ARGS__); \ 2604 __ext4_warning_inode(inode, "", 0, " "); \ 2605 } while (0) 2606 #define ext4_msg(sb, level, fmt, ...) \ 2607 do { \ 2608 no_printk(fmt, ##__VA_ARGS__); \ 2609 __ext4_msg(sb, "", " "); \ 2610 } while (0) 2611 #define dump_mmp_msg(sb, mmp, msg) \ 2612 __dump_mmp_msg(sb, mmp, "", 0, "") 2613 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2614 do { \ 2615 no_printk(fmt, ##__VA_ARGS__); \ 2616 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2617 } while (0) 2618 2619 #endif 2620 2621 extern void ext4_update_dynamic_rev(struct super_block *sb); 2622 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2623 __u32 compat); 2624 extern int ext4_update_rocompat_feature(handle_t *handle, 2625 struct super_block *sb, __u32 rocompat); 2626 extern int ext4_update_incompat_feature(handle_t *handle, 2627 struct super_block *sb, __u32 incompat); 2628 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2629 struct ext4_group_desc *bg); 2630 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2631 struct ext4_group_desc *bg); 2632 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2633 struct ext4_group_desc *bg); 2634 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2635 struct ext4_group_desc *bg); 2636 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2637 struct ext4_group_desc *bg); 2638 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2639 struct ext4_group_desc *bg); 2640 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2641 struct ext4_group_desc *bg); 2642 extern void ext4_block_bitmap_set(struct super_block *sb, 2643 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2644 extern void ext4_inode_bitmap_set(struct super_block *sb, 2645 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2646 extern void ext4_inode_table_set(struct super_block *sb, 2647 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2648 extern void ext4_free_group_clusters_set(struct super_block *sb, 2649 struct ext4_group_desc *bg, 2650 __u32 count); 2651 extern void ext4_free_inodes_set(struct super_block *sb, 2652 struct ext4_group_desc *bg, __u32 count); 2653 extern void ext4_used_dirs_set(struct super_block *sb, 2654 struct ext4_group_desc *bg, __u32 count); 2655 extern void ext4_itable_unused_set(struct super_block *sb, 2656 struct ext4_group_desc *bg, __u32 count); 2657 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2658 struct ext4_group_desc *gdp); 2659 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2660 struct ext4_group_desc *gdp); 2661 extern int ext4_register_li_request(struct super_block *sb, 2662 ext4_group_t first_not_zeroed); 2663 2664 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2665 { 2666 return ext4_has_feature_gdt_csum(sb) || 2667 EXT4_SB(sb)->s_chksum_driver != NULL; 2668 } 2669 2670 static inline int ext4_has_metadata_csum(struct super_block *sb) 2671 { 2672 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2673 !EXT4_SB(sb)->s_chksum_driver); 2674 2675 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2676 } 2677 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2678 { 2679 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2680 le32_to_cpu(es->s_blocks_count_lo); 2681 } 2682 2683 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2684 { 2685 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2686 le32_to_cpu(es->s_r_blocks_count_lo); 2687 } 2688 2689 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2690 { 2691 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2692 le32_to_cpu(es->s_free_blocks_count_lo); 2693 } 2694 2695 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2696 ext4_fsblk_t blk) 2697 { 2698 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2699 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2700 } 2701 2702 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2703 ext4_fsblk_t blk) 2704 { 2705 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2706 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2707 } 2708 2709 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2710 ext4_fsblk_t blk) 2711 { 2712 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2713 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2714 } 2715 2716 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2717 { 2718 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2719 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2720 le32_to_cpu(raw_inode->i_size_lo); 2721 else 2722 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2723 } 2724 2725 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2726 { 2727 raw_inode->i_size_lo = cpu_to_le32(i_size); 2728 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2729 } 2730 2731 static inline 2732 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2733 ext4_group_t group) 2734 { 2735 struct ext4_group_info ***grp_info; 2736 long indexv, indexh; 2737 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2738 grp_info = EXT4_SB(sb)->s_group_info; 2739 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2740 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2741 return grp_info[indexv][indexh]; 2742 } 2743 2744 /* 2745 * Reading s_groups_count requires using smp_rmb() afterwards. See 2746 * the locking protocol documented in the comments of ext4_group_add() 2747 * in resize.c 2748 */ 2749 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2750 { 2751 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2752 2753 smp_rmb(); 2754 return ngroups; 2755 } 2756 2757 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2758 ext4_group_t block_group) 2759 { 2760 return block_group >> sbi->s_log_groups_per_flex; 2761 } 2762 2763 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2764 { 2765 return 1 << sbi->s_log_groups_per_flex; 2766 } 2767 2768 #define ext4_std_error(sb, errno) \ 2769 do { \ 2770 if ((errno)) \ 2771 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2772 } while (0) 2773 2774 #ifdef CONFIG_SMP 2775 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2776 * counters. So we need to make sure we have free clusters more 2777 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2778 */ 2779 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2780 #else 2781 #define EXT4_FREECLUSTERS_WATERMARK 0 2782 #endif 2783 2784 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2785 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2786 { 2787 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2788 !mutex_is_locked(&inode->i_mutex)); 2789 down_write(&EXT4_I(inode)->i_data_sem); 2790 if (newsize > EXT4_I(inode)->i_disksize) 2791 EXT4_I(inode)->i_disksize = newsize; 2792 up_write(&EXT4_I(inode)->i_data_sem); 2793 } 2794 2795 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2796 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2797 { 2798 int changed = 0; 2799 2800 if (newsize > inode->i_size) { 2801 i_size_write(inode, newsize); 2802 changed = 1; 2803 } 2804 if (newsize > EXT4_I(inode)->i_disksize) { 2805 ext4_update_i_disksize(inode, newsize); 2806 changed |= 2; 2807 } 2808 return changed; 2809 } 2810 2811 struct ext4_group_info { 2812 unsigned long bb_state; 2813 struct rb_root bb_free_root; 2814 ext4_grpblk_t bb_first_free; /* first free block */ 2815 ext4_grpblk_t bb_free; /* total free blocks */ 2816 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2817 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2818 struct list_head bb_prealloc_list; 2819 #ifdef DOUBLE_CHECK 2820 void *bb_bitmap; 2821 #endif 2822 struct rw_semaphore alloc_sem; 2823 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2824 * regions, index is order. 2825 * bb_counters[3] = 5 means 2826 * 5 free 8-block regions. */ 2827 }; 2828 2829 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2830 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2831 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2832 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2833 2834 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2835 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2836 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2837 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2838 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2839 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2840 2841 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2842 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2843 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2844 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2845 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2846 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2847 2848 #define EXT4_MAX_CONTENTION 8 2849 #define EXT4_CONTENTION_THRESHOLD 2 2850 2851 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2852 ext4_group_t group) 2853 { 2854 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2855 } 2856 2857 /* 2858 * Returns true if the filesystem is busy enough that attempts to 2859 * access the block group locks has run into contention. 2860 */ 2861 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2862 { 2863 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2864 } 2865 2866 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2867 { 2868 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2869 if (spin_trylock(lock)) 2870 /* 2871 * We're able to grab the lock right away, so drop the 2872 * lock contention counter. 2873 */ 2874 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2875 else { 2876 /* 2877 * The lock is busy, so bump the contention counter, 2878 * and then wait on the spin lock. 2879 */ 2880 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2881 EXT4_MAX_CONTENTION); 2882 spin_lock(lock); 2883 } 2884 } 2885 2886 static inline void ext4_unlock_group(struct super_block *sb, 2887 ext4_group_t group) 2888 { 2889 spin_unlock(ext4_group_lock_ptr(sb, group)); 2890 } 2891 2892 /* 2893 * Block validity checking 2894 */ 2895 #define ext4_check_indirect_blockref(inode, bh) \ 2896 ext4_check_blockref(__func__, __LINE__, inode, \ 2897 (__le32 *)(bh)->b_data, \ 2898 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2899 2900 #define ext4_ind_check_inode(inode) \ 2901 ext4_check_blockref(__func__, __LINE__, inode, \ 2902 EXT4_I(inode)->i_data, \ 2903 EXT4_NDIR_BLOCKS) 2904 2905 /* 2906 * Inodes and files operations 2907 */ 2908 2909 /* dir.c */ 2910 extern const struct file_operations ext4_dir_operations; 2911 2912 /* file.c */ 2913 extern const struct inode_operations ext4_file_inode_operations; 2914 extern const struct file_operations ext4_file_operations; 2915 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2916 2917 /* inline.c */ 2918 extern int ext4_get_max_inline_size(struct inode *inode); 2919 extern int ext4_find_inline_data_nolock(struct inode *inode); 2920 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2921 unsigned int len); 2922 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2923 2924 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2925 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2926 struct inode *inode, 2927 loff_t pos, unsigned len, 2928 unsigned flags, 2929 struct page **pagep); 2930 extern int ext4_write_inline_data_end(struct inode *inode, 2931 loff_t pos, unsigned len, 2932 unsigned copied, 2933 struct page *page); 2934 extern struct buffer_head * 2935 ext4_journalled_write_inline_data(struct inode *inode, 2936 unsigned len, 2937 struct page *page); 2938 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2939 struct inode *inode, 2940 loff_t pos, unsigned len, 2941 unsigned flags, 2942 struct page **pagep, 2943 void **fsdata); 2944 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2945 unsigned len, unsigned copied, 2946 struct page *page); 2947 extern int ext4_try_add_inline_entry(handle_t *handle, 2948 struct ext4_filename *fname, 2949 struct dentry *dentry, 2950 struct inode *inode); 2951 extern int ext4_try_create_inline_dir(handle_t *handle, 2952 struct inode *parent, 2953 struct inode *inode); 2954 extern int ext4_read_inline_dir(struct file *filp, 2955 struct dir_context *ctx, 2956 int *has_inline_data); 2957 extern int htree_inlinedir_to_tree(struct file *dir_file, 2958 struct inode *dir, ext4_lblk_t block, 2959 struct dx_hash_info *hinfo, 2960 __u32 start_hash, __u32 start_minor_hash, 2961 int *has_inline_data); 2962 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2963 struct ext4_filename *fname, 2964 const struct qstr *d_name, 2965 struct ext4_dir_entry_2 **res_dir, 2966 int *has_inline_data); 2967 extern int ext4_delete_inline_entry(handle_t *handle, 2968 struct inode *dir, 2969 struct ext4_dir_entry_2 *de_del, 2970 struct buffer_head *bh, 2971 int *has_inline_data); 2972 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2973 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2974 struct ext4_dir_entry_2 **parent_de, 2975 int *retval); 2976 extern int ext4_inline_data_fiemap(struct inode *inode, 2977 struct fiemap_extent_info *fieinfo, 2978 int *has_inline, __u64 start, __u64 len); 2979 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2980 struct inode *inode, 2981 int needed); 2982 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2983 2984 extern int ext4_convert_inline_data(struct inode *inode); 2985 2986 static inline int ext4_has_inline_data(struct inode *inode) 2987 { 2988 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 2989 EXT4_I(inode)->i_inline_off; 2990 } 2991 2992 /* namei.c */ 2993 extern const struct inode_operations ext4_dir_inode_operations; 2994 extern const struct inode_operations ext4_special_inode_operations; 2995 extern struct dentry *ext4_get_parent(struct dentry *child); 2996 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2997 struct ext4_dir_entry_2 *de, 2998 int blocksize, int csum_size, 2999 unsigned int parent_ino, int dotdot_real_len); 3000 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3001 unsigned int blocksize); 3002 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3003 struct inode *inode, 3004 struct buffer_head *bh); 3005 #define S_SHIFT 12 3006 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3007 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3008 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3009 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3010 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3011 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3012 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3013 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3014 }; 3015 3016 static inline void ext4_set_de_type(struct super_block *sb, 3017 struct ext4_dir_entry_2 *de, 3018 umode_t mode) { 3019 if (ext4_has_feature_filetype(sb)) 3020 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3021 } 3022 3023 /* readpages.c */ 3024 extern int ext4_mpage_readpages(struct address_space *mapping, 3025 struct list_head *pages, struct page *page, 3026 unsigned nr_pages); 3027 3028 /* symlink.c */ 3029 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3030 extern const struct inode_operations ext4_symlink_inode_operations; 3031 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3032 3033 /* sysfs.c */ 3034 extern int ext4_register_sysfs(struct super_block *sb); 3035 extern void ext4_unregister_sysfs(struct super_block *sb); 3036 extern int __init ext4_init_sysfs(void); 3037 extern void ext4_exit_sysfs(void); 3038 3039 /* block_validity */ 3040 extern void ext4_release_system_zone(struct super_block *sb); 3041 extern int ext4_setup_system_zone(struct super_block *sb); 3042 extern int __init ext4_init_system_zone(void); 3043 extern void ext4_exit_system_zone(void); 3044 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3045 ext4_fsblk_t start_blk, 3046 unsigned int count); 3047 extern int ext4_check_blockref(const char *, unsigned int, 3048 struct inode *, __le32 *, unsigned int); 3049 3050 /* extents.c */ 3051 struct ext4_ext_path; 3052 struct ext4_extent; 3053 3054 /* 3055 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3056 * __le32. 3057 */ 3058 #define EXT_MAX_BLOCKS 0xffffffff 3059 3060 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3061 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3062 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3063 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3064 struct ext4_map_blocks *map, int flags); 3065 extern void ext4_ext_truncate(handle_t *, struct inode *); 3066 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3067 ext4_lblk_t end); 3068 extern void ext4_ext_init(struct super_block *); 3069 extern void ext4_ext_release(struct super_block *); 3070 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3071 loff_t len); 3072 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3073 loff_t offset, ssize_t len); 3074 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3075 struct ext4_map_blocks *map, int flags); 3076 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3077 ext4_lblk_t lblocks); 3078 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3079 int num, 3080 struct ext4_ext_path *path); 3081 extern int ext4_can_extents_be_merged(struct inode *inode, 3082 struct ext4_extent *ex1, 3083 struct ext4_extent *ex2); 3084 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3085 struct ext4_ext_path **, 3086 struct ext4_extent *, int); 3087 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3088 struct ext4_ext_path **, 3089 int flags); 3090 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3091 extern int ext4_ext_check_inode(struct inode *inode); 3092 extern int ext4_find_delalloc_range(struct inode *inode, 3093 ext4_lblk_t lblk_start, 3094 ext4_lblk_t lblk_end); 3095 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3096 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3097 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3098 __u64 start, __u64 len); 3099 extern int ext4_ext_precache(struct inode *inode); 3100 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3101 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3102 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3103 struct inode *inode2, ext4_lblk_t lblk1, 3104 ext4_lblk_t lblk2, ext4_lblk_t count, 3105 int mark_unwritten,int *err); 3106 3107 /* move_extent.c */ 3108 extern void ext4_double_down_write_data_sem(struct inode *first, 3109 struct inode *second); 3110 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3111 struct inode *donor_inode); 3112 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3113 __u64 start_orig, __u64 start_donor, 3114 __u64 len, __u64 *moved_len); 3115 3116 /* page-io.c */ 3117 extern int __init ext4_init_pageio(void); 3118 extern void ext4_exit_pageio(void); 3119 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3120 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3121 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3122 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3123 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3124 struct writeback_control *wbc); 3125 extern void ext4_end_io_rsv_work(struct work_struct *work); 3126 extern void ext4_io_submit(struct ext4_io_submit *io); 3127 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3128 struct page *page, 3129 int len, 3130 struct writeback_control *wbc, 3131 bool keep_towrite); 3132 3133 /* mmp.c */ 3134 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3135 3136 /* 3137 * Add new method to test whether block and inode bitmaps are properly 3138 * initialized. With uninit_bg reading the block from disk is not enough 3139 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3140 */ 3141 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3142 3143 static inline int bitmap_uptodate(struct buffer_head *bh) 3144 { 3145 return (buffer_uptodate(bh) && 3146 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3147 } 3148 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3149 { 3150 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3151 } 3152 3153 /* 3154 * Disable DIO read nolock optimization, so new dioreaders will be forced 3155 * to grab i_mutex 3156 */ 3157 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3158 { 3159 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3160 smp_mb(); 3161 } 3162 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3163 { 3164 smp_mb(); 3165 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3166 } 3167 3168 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3169 3170 /* For ioend & aio unwritten conversion wait queues */ 3171 #define EXT4_WQ_HASH_SZ 37 3172 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3173 EXT4_WQ_HASH_SZ]) 3174 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 3175 EXT4_WQ_HASH_SZ]) 3176 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3177 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 3178 3179 #define EXT4_RESIZING 0 3180 extern int ext4_resize_begin(struct super_block *sb); 3181 extern void ext4_resize_end(struct super_block *sb); 3182 3183 #endif /* __KERNEL__ */ 3184 3185 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3186 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3187 3188 #endif /* _EXT4_H */ 3189