1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/version.h> 30 #include <linux/wait.h> 31 #include <linux/blockgroup_lock.h> 32 #include <linux/percpu_counter.h> 33 #include <linux/ratelimit.h> 34 #include <crypto/hash.h> 35 #include <linux/falloc.h> 36 #ifdef __KERNEL__ 37 #include <linux/compat.h> 38 #endif 39 40 /* 41 * The fourth extended filesystem constants/structures 42 */ 43 44 /* 45 * Define EXT4FS_DEBUG to produce debug messages 46 */ 47 #undef EXT4FS_DEBUG 48 49 /* 50 * Debug code 51 */ 52 #ifdef EXT4FS_DEBUG 53 #define ext4_debug(f, a...) \ 54 do { \ 55 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 56 __FILE__, __LINE__, __func__); \ 57 printk(KERN_DEBUG f, ## a); \ 58 } while (0) 59 #else 60 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 61 #endif 62 63 /* 64 * Turn on EXT_DEBUG to get lots of info about extents operations. 65 */ 66 #define EXT_DEBUG__ 67 #ifdef EXT_DEBUG 68 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 69 #else 70 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 71 #endif 72 73 /* data type for block offset of block group */ 74 typedef int ext4_grpblk_t; 75 76 /* data type for filesystem-wide blocks number */ 77 typedef unsigned long long ext4_fsblk_t; 78 79 /* data type for file logical block number */ 80 typedef __u32 ext4_lblk_t; 81 82 /* data type for block group number */ 83 typedef unsigned int ext4_group_t; 84 85 enum SHIFT_DIRECTION { 86 SHIFT_LEFT = 0, 87 SHIFT_RIGHT, 88 }; 89 90 /* 91 * Flags used in mballoc's allocation_context flags field. 92 * 93 * Also used to show what's going on for debugging purposes when the 94 * flag field is exported via the traceport interface 95 */ 96 97 /* prefer goal again. length */ 98 #define EXT4_MB_HINT_MERGE 0x0001 99 /* blocks already reserved */ 100 #define EXT4_MB_HINT_RESERVED 0x0002 101 /* metadata is being allocated */ 102 #define EXT4_MB_HINT_METADATA 0x0004 103 /* first blocks in the file */ 104 #define EXT4_MB_HINT_FIRST 0x0008 105 /* search for the best chunk */ 106 #define EXT4_MB_HINT_BEST 0x0010 107 /* data is being allocated */ 108 #define EXT4_MB_HINT_DATA 0x0020 109 /* don't preallocate (for tails) */ 110 #define EXT4_MB_HINT_NOPREALLOC 0x0040 111 /* allocate for locality group */ 112 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 113 /* allocate goal blocks or none */ 114 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 115 /* goal is meaningful */ 116 #define EXT4_MB_HINT_TRY_GOAL 0x0200 117 /* blocks already pre-reserved by delayed allocation */ 118 #define EXT4_MB_DELALLOC_RESERVED 0x0400 119 /* We are doing stream allocation */ 120 #define EXT4_MB_STREAM_ALLOC 0x0800 121 /* Use reserved root blocks if needed */ 122 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 123 /* Use blocks from reserved pool */ 124 #define EXT4_MB_USE_RESERVED 0x2000 125 126 struct ext4_allocation_request { 127 /* target inode for block we're allocating */ 128 struct inode *inode; 129 /* how many blocks we want to allocate */ 130 unsigned int len; 131 /* logical block in target inode */ 132 ext4_lblk_t logical; 133 /* the closest logical allocated block to the left */ 134 ext4_lblk_t lleft; 135 /* the closest logical allocated block to the right */ 136 ext4_lblk_t lright; 137 /* phys. target (a hint) */ 138 ext4_fsblk_t goal; 139 /* phys. block for the closest logical allocated block to the left */ 140 ext4_fsblk_t pleft; 141 /* phys. block for the closest logical allocated block to the right */ 142 ext4_fsblk_t pright; 143 /* flags. see above EXT4_MB_HINT_* */ 144 unsigned int flags; 145 }; 146 147 /* 148 * Logical to physical block mapping, used by ext4_map_blocks() 149 * 150 * This structure is used to pass requests into ext4_map_blocks() as 151 * well as to store the information returned by ext4_map_blocks(). It 152 * takes less room on the stack than a struct buffer_head. 153 */ 154 #define EXT4_MAP_NEW (1 << BH_New) 155 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 156 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 157 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 158 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 159 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 160 161 struct ext4_map_blocks { 162 ext4_fsblk_t m_pblk; 163 ext4_lblk_t m_lblk; 164 unsigned int m_len; 165 unsigned int m_flags; 166 }; 167 168 /* 169 * Flags for ext4_io_end->flags 170 */ 171 #define EXT4_IO_END_UNWRITTEN 0x0001 172 173 /* 174 * For converting unwritten extents on a work queue. 'handle' is used for 175 * buffered writeback. 176 */ 177 typedef struct ext4_io_end { 178 struct list_head list; /* per-file finished IO list */ 179 handle_t *handle; /* handle reserved for extent 180 * conversion */ 181 struct inode *inode; /* file being written to */ 182 struct bio *bio; /* Linked list of completed 183 * bios covering the extent */ 184 unsigned int flag; /* unwritten or not */ 185 loff_t offset; /* offset in the file */ 186 ssize_t size; /* size of the extent */ 187 atomic_t count; /* reference counter */ 188 } ext4_io_end_t; 189 190 struct ext4_io_submit { 191 struct writeback_control *io_wbc; 192 struct bio *io_bio; 193 ext4_io_end_t *io_end; 194 sector_t io_next_block; 195 }; 196 197 /* 198 * Special inodes numbers 199 */ 200 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 201 #define EXT4_ROOT_INO 2 /* Root inode */ 202 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 203 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 204 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 205 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 206 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 207 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 208 209 /* First non-reserved inode for old ext4 filesystems */ 210 #define EXT4_GOOD_OLD_FIRST_INO 11 211 212 /* 213 * Maximal count of links to a file 214 */ 215 #define EXT4_LINK_MAX 65000 216 217 /* 218 * Macro-instructions used to manage several block sizes 219 */ 220 #define EXT4_MIN_BLOCK_SIZE 1024 221 #define EXT4_MAX_BLOCK_SIZE 65536 222 #define EXT4_MIN_BLOCK_LOG_SIZE 10 223 #define EXT4_MAX_BLOCK_LOG_SIZE 16 224 #ifdef __KERNEL__ 225 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 226 #else 227 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 228 #endif 229 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 230 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 231 EXT4_SB(s)->s_cluster_bits) 232 #ifdef __KERNEL__ 233 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 234 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 235 #else 236 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 237 #endif 238 #ifdef __KERNEL__ 239 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 240 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 241 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 242 #else 243 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 244 EXT4_GOOD_OLD_INODE_SIZE : \ 245 (s)->s_inode_size) 246 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 247 EXT4_GOOD_OLD_FIRST_INO : \ 248 (s)->s_first_ino) 249 #endif 250 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 251 252 /* Translate a block number to a cluster number */ 253 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 254 /* Translate a cluster number to a block number */ 255 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 256 /* Translate # of blks to # of clusters */ 257 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 258 (sbi)->s_cluster_bits) 259 /* Mask out the low bits to get the starting block of the cluster */ 260 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 261 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 262 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 263 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 264 /* Get the cluster offset */ 265 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 266 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 267 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 268 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 269 270 /* 271 * Structure of a blocks group descriptor 272 */ 273 struct ext4_group_desc 274 { 275 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 276 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 277 __le32 bg_inode_table_lo; /* Inodes table block */ 278 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 279 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 280 __le16 bg_used_dirs_count_lo; /* Directories count */ 281 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 282 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 283 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 284 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 285 __le16 bg_itable_unused_lo; /* Unused inodes count */ 286 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 287 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 288 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 289 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 290 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 291 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 292 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 293 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 294 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 295 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 296 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 297 __u32 bg_reserved; 298 }; 299 300 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 301 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 302 sizeof(__le16)) 303 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 304 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 305 sizeof(__le16)) 306 307 /* 308 * Structure of a flex block group info 309 */ 310 311 struct flex_groups { 312 atomic64_t free_clusters; 313 atomic_t free_inodes; 314 atomic_t used_dirs; 315 }; 316 317 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 318 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 319 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 320 321 /* 322 * Macro-instructions used to manage group descriptors 323 */ 324 #define EXT4_MIN_DESC_SIZE 32 325 #define EXT4_MIN_DESC_SIZE_64BIT 64 326 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 327 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 328 #ifdef __KERNEL__ 329 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 330 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 331 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 332 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 333 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 334 #else 335 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 336 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 337 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 338 #endif 339 340 /* 341 * Constants relative to the data blocks 342 */ 343 #define EXT4_NDIR_BLOCKS 12 344 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 345 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 346 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 347 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 348 349 /* 350 * Inode flags 351 */ 352 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 353 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 354 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 355 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 356 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 357 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 358 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 359 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 360 /* Reserved for compression usage... */ 361 #define EXT4_DIRTY_FL 0x00000100 362 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 363 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 364 /* nb: was previously EXT2_ECOMPR_FL */ 365 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 366 /* End compression flags --- maybe not all used */ 367 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 368 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 369 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 370 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 371 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 372 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 373 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 374 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 375 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 376 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 377 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 378 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 379 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 380 381 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 382 #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */ 383 384 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 385 EXT4_IMMUTABLE_FL | \ 386 EXT4_APPEND_FL | \ 387 EXT4_NODUMP_FL | \ 388 EXT4_NOATIME_FL | \ 389 EXT4_PROJINHERIT_FL) 390 391 /* Flags that should be inherited by new inodes from their parent. */ 392 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 393 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 394 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 395 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 396 EXT4_PROJINHERIT_FL) 397 398 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 399 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 400 401 /* Flags that are appropriate for non-directories/regular files. */ 402 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 403 404 /* Mask out flags that are inappropriate for the given type of inode. */ 405 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 406 { 407 if (S_ISDIR(mode)) 408 return flags; 409 else if (S_ISREG(mode)) 410 return flags & EXT4_REG_FLMASK; 411 else 412 return flags & EXT4_OTHER_FLMASK; 413 } 414 415 /* 416 * Inode flags used for atomic set/get 417 */ 418 enum { 419 EXT4_INODE_SECRM = 0, /* Secure deletion */ 420 EXT4_INODE_UNRM = 1, /* Undelete */ 421 EXT4_INODE_COMPR = 2, /* Compress file */ 422 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 423 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 424 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 425 EXT4_INODE_NODUMP = 6, /* do not dump file */ 426 EXT4_INODE_NOATIME = 7, /* do not update atime */ 427 /* Reserved for compression usage... */ 428 EXT4_INODE_DIRTY = 8, 429 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 430 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 431 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 432 /* End compression flags --- maybe not all used */ 433 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 434 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 435 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 436 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 437 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 438 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 439 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 440 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 441 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 442 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 443 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 444 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 445 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 446 }; 447 448 /* 449 * Since it's pretty easy to mix up bit numbers and hex values, we use a 450 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 451 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 452 * any extra space in the compiled kernel image, otherwise, the build will fail. 453 * It's important that these values are the same, since we are using 454 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 455 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 456 * values found in ext2, ext3 and ext4 filesystems, and of course the values 457 * defined in e2fsprogs. 458 * 459 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 460 */ 461 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 462 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 463 464 static inline void ext4_check_flag_values(void) 465 { 466 CHECK_FLAG_VALUE(SECRM); 467 CHECK_FLAG_VALUE(UNRM); 468 CHECK_FLAG_VALUE(COMPR); 469 CHECK_FLAG_VALUE(SYNC); 470 CHECK_FLAG_VALUE(IMMUTABLE); 471 CHECK_FLAG_VALUE(APPEND); 472 CHECK_FLAG_VALUE(NODUMP); 473 CHECK_FLAG_VALUE(NOATIME); 474 CHECK_FLAG_VALUE(DIRTY); 475 CHECK_FLAG_VALUE(COMPRBLK); 476 CHECK_FLAG_VALUE(NOCOMPR); 477 CHECK_FLAG_VALUE(ENCRYPT); 478 CHECK_FLAG_VALUE(INDEX); 479 CHECK_FLAG_VALUE(IMAGIC); 480 CHECK_FLAG_VALUE(JOURNAL_DATA); 481 CHECK_FLAG_VALUE(NOTAIL); 482 CHECK_FLAG_VALUE(DIRSYNC); 483 CHECK_FLAG_VALUE(TOPDIR); 484 CHECK_FLAG_VALUE(HUGE_FILE); 485 CHECK_FLAG_VALUE(EXTENTS); 486 CHECK_FLAG_VALUE(EA_INODE); 487 CHECK_FLAG_VALUE(EOFBLOCKS); 488 CHECK_FLAG_VALUE(INLINE_DATA); 489 CHECK_FLAG_VALUE(PROJINHERIT); 490 CHECK_FLAG_VALUE(RESERVED); 491 } 492 493 /* Used to pass group descriptor data when online resize is done */ 494 struct ext4_new_group_input { 495 __u32 group; /* Group number for this data */ 496 __u64 block_bitmap; /* Absolute block number of block bitmap */ 497 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 498 __u64 inode_table; /* Absolute block number of inode table start */ 499 __u32 blocks_count; /* Total number of blocks in this group */ 500 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 501 __u16 unused; 502 }; 503 504 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 505 struct compat_ext4_new_group_input { 506 u32 group; 507 compat_u64 block_bitmap; 508 compat_u64 inode_bitmap; 509 compat_u64 inode_table; 510 u32 blocks_count; 511 u16 reserved_blocks; 512 u16 unused; 513 }; 514 #endif 515 516 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 517 struct ext4_new_group_data { 518 __u32 group; 519 __u64 block_bitmap; 520 __u64 inode_bitmap; 521 __u64 inode_table; 522 __u32 blocks_count; 523 __u16 reserved_blocks; 524 __u16 unused; 525 __u32 free_blocks_count; 526 }; 527 528 /* Indexes used to index group tables in ext4_new_group_data */ 529 enum { 530 BLOCK_BITMAP = 0, /* block bitmap */ 531 INODE_BITMAP, /* inode bitmap */ 532 INODE_TABLE, /* inode tables */ 533 GROUP_TABLE_COUNT, 534 }; 535 536 /* 537 * Flags used by ext4_map_blocks() 538 */ 539 /* Allocate any needed blocks and/or convert an unwritten 540 extent to be an initialized ext4 */ 541 #define EXT4_GET_BLOCKS_CREATE 0x0001 542 /* Request the creation of an unwritten extent */ 543 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 544 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 545 EXT4_GET_BLOCKS_CREATE) 546 /* Caller is from the delayed allocation writeout path 547 * finally doing the actual allocation of delayed blocks */ 548 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 549 /* caller is from the direct IO path, request to creation of an 550 unwritten extents if not allocated, split the unwritten 551 extent if blocks has been preallocated already*/ 552 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 553 #define EXT4_GET_BLOCKS_CONVERT 0x0010 554 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 555 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 556 /* Convert extent to initialized after IO complete */ 557 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 558 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 559 /* Eventual metadata allocation (due to growing extent tree) 560 * should not fail, so try to use reserved blocks for that.*/ 561 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 562 /* Don't normalize allocation size (used for fallocate) */ 563 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 564 /* Request will not result in inode size update (user for fallocate) */ 565 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 566 /* Convert written extents to unwritten */ 567 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 568 /* Write zeros to newly created written extents */ 569 #define EXT4_GET_BLOCKS_ZERO 0x0200 570 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 571 EXT4_GET_BLOCKS_ZERO) 572 573 /* 574 * The bit position of these flags must not overlap with any of the 575 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 576 * read_extent_tree_block(), ext4_split_extent_at(), 577 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 578 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 579 * caching the extents when reading from the extent tree while a 580 * truncate or punch hole operation is in progress. 581 */ 582 #define EXT4_EX_NOCACHE 0x40000000 583 #define EXT4_EX_FORCE_CACHE 0x20000000 584 585 /* 586 * Flags used by ext4_free_blocks 587 */ 588 #define EXT4_FREE_BLOCKS_METADATA 0x0001 589 #define EXT4_FREE_BLOCKS_FORGET 0x0002 590 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 591 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 592 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 593 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 594 595 /* Encryption algorithms */ 596 #define EXT4_ENCRYPTION_MODE_INVALID 0 597 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 598 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 599 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 600 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 601 602 #include "ext4_crypto.h" 603 604 /* 605 * ioctl commands 606 */ 607 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 608 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 609 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 610 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 611 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 612 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 613 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 614 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 615 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 616 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 617 #define EXT4_IOC_MIGRATE _IO('f', 9) 618 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 619 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 620 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 621 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 622 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 623 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 624 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 625 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 626 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 627 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 628 629 #ifndef FS_IOC_FSGETXATTR 630 /* Until the uapi changes get merged for project quota... */ 631 632 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 633 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 634 635 /* 636 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 637 */ 638 struct fsxattr { 639 __u32 fsx_xflags; /* xflags field value (get/set) */ 640 __u32 fsx_extsize; /* extsize field value (get/set)*/ 641 __u32 fsx_nextents; /* nextents field value (get) */ 642 __u32 fsx_projid; /* project identifier (get/set) */ 643 unsigned char fsx_pad[12]; 644 }; 645 646 /* 647 * Flags for the fsx_xflags field 648 */ 649 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 650 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 651 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 652 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 653 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 654 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 655 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 656 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 657 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 658 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 659 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 660 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 661 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 662 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 663 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 664 #endif /* !defined(FS_IOC_FSGETXATTR) */ 665 666 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 667 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 668 669 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 670 /* 671 * ioctl commands in 32 bit emulation 672 */ 673 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 674 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 675 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 676 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 677 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 678 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 679 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 680 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 681 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 682 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 683 #endif 684 685 /* Max physical block we can address w/o extents */ 686 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 687 688 /* 689 * Structure of an inode on the disk 690 */ 691 struct ext4_inode { 692 __le16 i_mode; /* File mode */ 693 __le16 i_uid; /* Low 16 bits of Owner Uid */ 694 __le32 i_size_lo; /* Size in bytes */ 695 __le32 i_atime; /* Access time */ 696 __le32 i_ctime; /* Inode Change time */ 697 __le32 i_mtime; /* Modification time */ 698 __le32 i_dtime; /* Deletion Time */ 699 __le16 i_gid; /* Low 16 bits of Group Id */ 700 __le16 i_links_count; /* Links count */ 701 __le32 i_blocks_lo; /* Blocks count */ 702 __le32 i_flags; /* File flags */ 703 union { 704 struct { 705 __le32 l_i_version; 706 } linux1; 707 struct { 708 __u32 h_i_translator; 709 } hurd1; 710 struct { 711 __u32 m_i_reserved1; 712 } masix1; 713 } osd1; /* OS dependent 1 */ 714 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 715 __le32 i_generation; /* File version (for NFS) */ 716 __le32 i_file_acl_lo; /* File ACL */ 717 __le32 i_size_high; 718 __le32 i_obso_faddr; /* Obsoleted fragment address */ 719 union { 720 struct { 721 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 722 __le16 l_i_file_acl_high; 723 __le16 l_i_uid_high; /* these 2 fields */ 724 __le16 l_i_gid_high; /* were reserved2[0] */ 725 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 726 __le16 l_i_reserved; 727 } linux2; 728 struct { 729 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 730 __u16 h_i_mode_high; 731 __u16 h_i_uid_high; 732 __u16 h_i_gid_high; 733 __u32 h_i_author; 734 } hurd2; 735 struct { 736 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 737 __le16 m_i_file_acl_high; 738 __u32 m_i_reserved2[2]; 739 } masix2; 740 } osd2; /* OS dependent 2 */ 741 __le16 i_extra_isize; 742 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 743 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 744 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 745 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 746 __le32 i_crtime; /* File Creation time */ 747 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 748 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 749 __le32 i_projid; /* Project ID */ 750 }; 751 752 struct move_extent { 753 __u32 reserved; /* should be zero */ 754 __u32 donor_fd; /* donor file descriptor */ 755 __u64 orig_start; /* logical start offset in block for orig */ 756 __u64 donor_start; /* logical start offset in block for donor */ 757 __u64 len; /* block length to be moved */ 758 __u64 moved_len; /* moved block length */ 759 }; 760 761 #define EXT4_EPOCH_BITS 2 762 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 763 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 764 765 /* 766 * Extended fields will fit into an inode if the filesystem was formatted 767 * with large inodes (-I 256 or larger) and there are not currently any EAs 768 * consuming all of the available space. For new inodes we always reserve 769 * enough space for the kernel's known extended fields, but for inodes 770 * created with an old kernel this might not have been the case. None of 771 * the extended inode fields is critical for correct filesystem operation. 772 * This macro checks if a certain field fits in the inode. Note that 773 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 774 */ 775 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 776 ((offsetof(typeof(*ext4_inode), field) + \ 777 sizeof((ext4_inode)->field)) \ 778 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 779 (einode)->i_extra_isize)) \ 780 781 /* 782 * We use an encoding that preserves the times for extra epoch "00": 783 * 784 * extra msb of adjust for signed 785 * epoch 32-bit 32-bit tv_sec to 786 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 787 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 788 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 789 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 790 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 791 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 792 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 793 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 794 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 795 * 796 * Note that previous versions of the kernel on 64-bit systems would 797 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 798 * 1970. e2fsck will correct this, assuming that it is run on the 799 * affected filesystem before 2242. 800 */ 801 802 static inline __le32 ext4_encode_extra_time(struct timespec *time) 803 { 804 u32 extra = sizeof(time->tv_sec) > 4 ? 805 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 806 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 807 } 808 809 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 810 { 811 if (unlikely(sizeof(time->tv_sec) > 4 && 812 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 813 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 814 /* Handle legacy encoding of pre-1970 dates with epoch 815 * bits 1,1. We assume that by kernel version 4.20, 816 * everyone will have run fsck over the affected 817 * filesystems to correct the problem. (This 818 * backwards compatibility may be removed before this 819 * time, at the discretion of the ext4 developers.) 820 */ 821 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 822 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 823 extra_bits = 0; 824 time->tv_sec += extra_bits << 32; 825 #else 826 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 827 #endif 828 } 829 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 830 } 831 832 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 833 do { \ 834 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 835 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 836 (raw_inode)->xtime ## _extra = \ 837 ext4_encode_extra_time(&(inode)->xtime); \ 838 } while (0) 839 840 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 841 do { \ 842 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 843 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 844 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 845 (raw_inode)->xtime ## _extra = \ 846 ext4_encode_extra_time(&(einode)->xtime); \ 847 } while (0) 848 849 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 850 do { \ 851 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 852 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 853 ext4_decode_extra_time(&(inode)->xtime, \ 854 raw_inode->xtime ## _extra); \ 855 else \ 856 (inode)->xtime.tv_nsec = 0; \ 857 } while (0) 858 859 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 860 do { \ 861 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 862 (einode)->xtime.tv_sec = \ 863 (signed)le32_to_cpu((raw_inode)->xtime); \ 864 else \ 865 (einode)->xtime.tv_sec = 0; \ 866 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 867 ext4_decode_extra_time(&(einode)->xtime, \ 868 raw_inode->xtime ## _extra); \ 869 else \ 870 (einode)->xtime.tv_nsec = 0; \ 871 } while (0) 872 873 #define i_disk_version osd1.linux1.l_i_version 874 875 #if defined(__KERNEL__) || defined(__linux__) 876 #define i_reserved1 osd1.linux1.l_i_reserved1 877 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 878 #define i_blocks_high osd2.linux2.l_i_blocks_high 879 #define i_uid_low i_uid 880 #define i_gid_low i_gid 881 #define i_uid_high osd2.linux2.l_i_uid_high 882 #define i_gid_high osd2.linux2.l_i_gid_high 883 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 884 885 #elif defined(__GNU__) 886 887 #define i_translator osd1.hurd1.h_i_translator 888 #define i_uid_high osd2.hurd2.h_i_uid_high 889 #define i_gid_high osd2.hurd2.h_i_gid_high 890 #define i_author osd2.hurd2.h_i_author 891 892 #elif defined(__masix__) 893 894 #define i_reserved1 osd1.masix1.m_i_reserved1 895 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 896 #define i_reserved2 osd2.masix2.m_i_reserved2 897 898 #endif /* defined(__KERNEL__) || defined(__linux__) */ 899 900 #include "extents_status.h" 901 902 /* 903 * fourth extended file system inode data in memory 904 */ 905 struct ext4_inode_info { 906 __le32 i_data[15]; /* unconverted */ 907 __u32 i_dtime; 908 ext4_fsblk_t i_file_acl; 909 910 /* 911 * i_block_group is the number of the block group which contains 912 * this file's inode. Constant across the lifetime of the inode, 913 * it is ued for making block allocation decisions - we try to 914 * place a file's data blocks near its inode block, and new inodes 915 * near to their parent directory's inode. 916 */ 917 ext4_group_t i_block_group; 918 ext4_lblk_t i_dir_start_lookup; 919 #if (BITS_PER_LONG < 64) 920 unsigned long i_state_flags; /* Dynamic state flags */ 921 #endif 922 unsigned long i_flags; 923 924 /* 925 * Extended attributes can be read independently of the main file 926 * data. Taking i_mutex even when reading would cause contention 927 * between readers of EAs and writers of regular file data, so 928 * instead we synchronize on xattr_sem when reading or changing 929 * EAs. 930 */ 931 struct rw_semaphore xattr_sem; 932 933 struct list_head i_orphan; /* unlinked but open inodes */ 934 935 /* 936 * i_disksize keeps track of what the inode size is ON DISK, not 937 * in memory. During truncate, i_size is set to the new size by 938 * the VFS prior to calling ext4_truncate(), but the filesystem won't 939 * set i_disksize to 0 until the truncate is actually under way. 940 * 941 * The intent is that i_disksize always represents the blocks which 942 * are used by this file. This allows recovery to restart truncate 943 * on orphans if we crash during truncate. We actually write i_disksize 944 * into the on-disk inode when writing inodes out, instead of i_size. 945 * 946 * The only time when i_disksize and i_size may be different is when 947 * a truncate is in progress. The only things which change i_disksize 948 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 949 */ 950 loff_t i_disksize; 951 952 /* 953 * i_data_sem is for serialising ext4_truncate() against 954 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 955 * data tree are chopped off during truncate. We can't do that in 956 * ext4 because whenever we perform intermediate commits during 957 * truncate, the inode and all the metadata blocks *must* be in a 958 * consistent state which allows truncation of the orphans to restart 959 * during recovery. Hence we must fix the get_block-vs-truncate race 960 * by other means, so we have i_data_sem. 961 */ 962 struct rw_semaphore i_data_sem; 963 /* 964 * i_mmap_sem is for serializing page faults with truncate / punch hole 965 * operations. We have to make sure that new page cannot be faulted in 966 * a section of the inode that is being punched. We cannot easily use 967 * i_data_sem for this since we need protection for the whole punch 968 * operation and i_data_sem ranks below transaction start so we have 969 * to occasionally drop it. 970 */ 971 struct rw_semaphore i_mmap_sem; 972 struct inode vfs_inode; 973 struct jbd2_inode *jinode; 974 975 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 976 977 /* 978 * File creation time. Its function is same as that of 979 * struct timespec i_{a,c,m}time in the generic inode. 980 */ 981 struct timespec i_crtime; 982 983 /* mballoc */ 984 struct list_head i_prealloc_list; 985 spinlock_t i_prealloc_lock; 986 987 /* extents status tree */ 988 struct ext4_es_tree i_es_tree; 989 rwlock_t i_es_lock; 990 struct list_head i_es_list; 991 unsigned int i_es_all_nr; /* protected by i_es_lock */ 992 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 993 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 994 extents to shrink. Protected by 995 i_es_lock */ 996 997 /* ialloc */ 998 ext4_group_t i_last_alloc_group; 999 1000 /* allocation reservation info for delalloc */ 1001 /* In case of bigalloc, these refer to clusters rather than blocks */ 1002 unsigned int i_reserved_data_blocks; 1003 unsigned int i_reserved_meta_blocks; 1004 unsigned int i_allocated_meta_blocks; 1005 ext4_lblk_t i_da_metadata_calc_last_lblock; 1006 int i_da_metadata_calc_len; 1007 1008 /* on-disk additional length */ 1009 __u16 i_extra_isize; 1010 1011 /* Indicate the inline data space. */ 1012 u16 i_inline_off; 1013 u16 i_inline_size; 1014 1015 #ifdef CONFIG_QUOTA 1016 /* quota space reservation, managed internally by quota code */ 1017 qsize_t i_reserved_quota; 1018 #endif 1019 1020 /* Lock protecting lists below */ 1021 spinlock_t i_completed_io_lock; 1022 /* 1023 * Completed IOs that need unwritten extents handling and have 1024 * transaction reserved 1025 */ 1026 struct list_head i_rsv_conversion_list; 1027 /* 1028 * Completed IOs that need unwritten extents handling and don't have 1029 * transaction reserved 1030 */ 1031 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 1032 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1033 struct work_struct i_rsv_conversion_work; 1034 1035 spinlock_t i_block_reservation_lock; 1036 1037 /* 1038 * Transactions that contain inode's metadata needed to complete 1039 * fsync and fdatasync, respectively. 1040 */ 1041 tid_t i_sync_tid; 1042 tid_t i_datasync_tid; 1043 1044 #ifdef CONFIG_QUOTA 1045 struct dquot *i_dquot[MAXQUOTAS]; 1046 #endif 1047 1048 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1049 __u32 i_csum_seed; 1050 1051 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1052 /* Encryption params */ 1053 struct ext4_crypt_info *i_crypt_info; 1054 #endif 1055 kprojid_t i_projid; 1056 }; 1057 1058 /* 1059 * File system states 1060 */ 1061 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1062 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1063 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1064 1065 /* 1066 * Misc. filesystem flags 1067 */ 1068 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1069 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1070 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1071 1072 /* 1073 * Mount flags set via mount options or defaults 1074 */ 1075 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1076 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1077 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1078 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1079 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1080 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1081 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1082 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1083 #ifdef CONFIG_FS_DAX 1084 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1085 #else 1086 #define EXT4_MOUNT_DAX 0 1087 #endif 1088 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1089 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1090 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1091 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1092 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1093 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1094 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1095 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1096 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1097 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1098 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1099 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1100 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1101 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1102 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1103 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1104 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1105 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1106 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1107 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1108 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1109 1110 /* 1111 * Mount flags set either automatically (could not be set by mount option) 1112 * based on per file system feature or property or in special cases such as 1113 * distinguishing between explicit mount option definition and default. 1114 */ 1115 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1116 specified delalloc */ 1117 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1118 size of blocksize * 8 1119 blocks */ 1120 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1121 file systems */ 1122 1123 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1124 specified journal checksum */ 1125 1126 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1127 ~EXT4_MOUNT_##opt 1128 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1129 EXT4_MOUNT_##opt 1130 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1131 EXT4_MOUNT_##opt) 1132 1133 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1134 ~EXT4_MOUNT2_##opt 1135 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1136 EXT4_MOUNT2_##opt 1137 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1138 EXT4_MOUNT2_##opt) 1139 1140 #define ext4_test_and_set_bit __test_and_set_bit_le 1141 #define ext4_set_bit __set_bit_le 1142 #define ext4_set_bit_atomic ext2_set_bit_atomic 1143 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1144 #define ext4_clear_bit __clear_bit_le 1145 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1146 #define ext4_test_bit test_bit_le 1147 #define ext4_find_next_zero_bit find_next_zero_bit_le 1148 #define ext4_find_next_bit find_next_bit_le 1149 1150 extern void ext4_set_bits(void *bm, int cur, int len); 1151 1152 /* 1153 * Maximal mount counts between two filesystem checks 1154 */ 1155 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1156 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1157 1158 /* 1159 * Behaviour when detecting errors 1160 */ 1161 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1162 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1163 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1164 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1165 1166 /* Metadata checksum algorithm codes */ 1167 #define EXT4_CRC32C_CHKSUM 1 1168 1169 /* 1170 * Structure of the super block 1171 */ 1172 struct ext4_super_block { 1173 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1174 __le32 s_blocks_count_lo; /* Blocks count */ 1175 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1176 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1177 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1178 __le32 s_first_data_block; /* First Data Block */ 1179 __le32 s_log_block_size; /* Block size */ 1180 __le32 s_log_cluster_size; /* Allocation cluster size */ 1181 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1182 __le32 s_clusters_per_group; /* # Clusters per group */ 1183 __le32 s_inodes_per_group; /* # Inodes per group */ 1184 __le32 s_mtime; /* Mount time */ 1185 /*30*/ __le32 s_wtime; /* Write time */ 1186 __le16 s_mnt_count; /* Mount count */ 1187 __le16 s_max_mnt_count; /* Maximal mount count */ 1188 __le16 s_magic; /* Magic signature */ 1189 __le16 s_state; /* File system state */ 1190 __le16 s_errors; /* Behaviour when detecting errors */ 1191 __le16 s_minor_rev_level; /* minor revision level */ 1192 /*40*/ __le32 s_lastcheck; /* time of last check */ 1193 __le32 s_checkinterval; /* max. time between checks */ 1194 __le32 s_creator_os; /* OS */ 1195 __le32 s_rev_level; /* Revision level */ 1196 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1197 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1198 /* 1199 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1200 * 1201 * Note: the difference between the compatible feature set and 1202 * the incompatible feature set is that if there is a bit set 1203 * in the incompatible feature set that the kernel doesn't 1204 * know about, it should refuse to mount the filesystem. 1205 * 1206 * e2fsck's requirements are more strict; if it doesn't know 1207 * about a feature in either the compatible or incompatible 1208 * feature set, it must abort and not try to meddle with 1209 * things it doesn't understand... 1210 */ 1211 __le32 s_first_ino; /* First non-reserved inode */ 1212 __le16 s_inode_size; /* size of inode structure */ 1213 __le16 s_block_group_nr; /* block group # of this superblock */ 1214 __le32 s_feature_compat; /* compatible feature set */ 1215 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1216 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1217 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1218 /*78*/ char s_volume_name[16]; /* volume name */ 1219 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1220 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1221 /* 1222 * Performance hints. Directory preallocation should only 1223 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1224 */ 1225 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1226 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1227 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1228 /* 1229 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1230 */ 1231 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1232 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1233 __le32 s_journal_dev; /* device number of journal file */ 1234 __le32 s_last_orphan; /* start of list of inodes to delete */ 1235 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1236 __u8 s_def_hash_version; /* Default hash version to use */ 1237 __u8 s_jnl_backup_type; 1238 __le16 s_desc_size; /* size of group descriptor */ 1239 /*100*/ __le32 s_default_mount_opts; 1240 __le32 s_first_meta_bg; /* First metablock block group */ 1241 __le32 s_mkfs_time; /* When the filesystem was created */ 1242 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1243 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1244 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1245 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1246 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1247 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1248 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1249 __le32 s_flags; /* Miscellaneous flags */ 1250 __le16 s_raid_stride; /* RAID stride */ 1251 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1252 __le64 s_mmp_block; /* Block for multi-mount protection */ 1253 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1254 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1255 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1256 __u8 s_encryption_level; /* versioning level for encryption */ 1257 __u8 s_reserved_pad; /* Padding to next 32bits */ 1258 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1259 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1260 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1261 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1262 snapshot's future use */ 1263 __le32 s_snapshot_list; /* inode number of the head of the 1264 on-disk snapshot list */ 1265 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1266 __le32 s_error_count; /* number of fs errors */ 1267 __le32 s_first_error_time; /* first time an error happened */ 1268 __le32 s_first_error_ino; /* inode involved in first error */ 1269 __le64 s_first_error_block; /* block involved of first error */ 1270 __u8 s_first_error_func[32]; /* function where the error happened */ 1271 __le32 s_first_error_line; /* line number where error happened */ 1272 __le32 s_last_error_time; /* most recent time of an error */ 1273 __le32 s_last_error_ino; /* inode involved in last error */ 1274 __le32 s_last_error_line; /* line number where error happened */ 1275 __le64 s_last_error_block; /* block involved of last error */ 1276 __u8 s_last_error_func[32]; /* function where the error happened */ 1277 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1278 __u8 s_mount_opts[64]; 1279 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1280 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1281 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1282 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1283 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1284 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1285 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1286 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1287 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1288 __le32 s_reserved[98]; /* Padding to the end of the block */ 1289 __le32 s_checksum; /* crc32c(superblock) */ 1290 }; 1291 1292 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1293 1294 #ifdef __KERNEL__ 1295 1296 /* 1297 * run-time mount flags 1298 */ 1299 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1300 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1301 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1302 1303 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1304 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1305 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1306 #else 1307 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1308 #endif 1309 1310 /* Number of quota types we support */ 1311 #define EXT4_MAXQUOTAS 3 1312 1313 /* 1314 * fourth extended-fs super-block data in memory 1315 */ 1316 struct ext4_sb_info { 1317 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1318 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1319 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1320 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1321 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1322 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1323 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1324 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1325 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1326 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1327 unsigned long s_overhead; /* # of fs overhead clusters */ 1328 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1329 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1330 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1331 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1332 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1333 struct buffer_head **s_group_desc; 1334 unsigned int s_mount_opt; 1335 unsigned int s_mount_opt2; 1336 unsigned int s_mount_flags; 1337 unsigned int s_def_mount_opt; 1338 ext4_fsblk_t s_sb_block; 1339 atomic64_t s_resv_clusters; 1340 kuid_t s_resuid; 1341 kgid_t s_resgid; 1342 unsigned short s_mount_state; 1343 unsigned short s_pad; 1344 int s_addr_per_block_bits; 1345 int s_desc_per_block_bits; 1346 int s_inode_size; 1347 int s_first_ino; 1348 unsigned int s_inode_readahead_blks; 1349 unsigned int s_inode_goal; 1350 spinlock_t s_next_gen_lock; 1351 u32 s_next_generation; 1352 u32 s_hash_seed[4]; 1353 int s_def_hash_version; 1354 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1355 struct percpu_counter s_freeclusters_counter; 1356 struct percpu_counter s_freeinodes_counter; 1357 struct percpu_counter s_dirs_counter; 1358 struct percpu_counter s_dirtyclusters_counter; 1359 struct blockgroup_lock *s_blockgroup_lock; 1360 struct proc_dir_entry *s_proc; 1361 struct kobject s_kobj; 1362 struct completion s_kobj_unregister; 1363 struct super_block *s_sb; 1364 1365 /* Journaling */ 1366 struct journal_s *s_journal; 1367 struct list_head s_orphan; 1368 struct mutex s_orphan_lock; 1369 unsigned long s_resize_flags; /* Flags indicating if there 1370 is a resizer */ 1371 unsigned long s_commit_interval; 1372 u32 s_max_batch_time; 1373 u32 s_min_batch_time; 1374 struct block_device *journal_bdev; 1375 #ifdef CONFIG_QUOTA 1376 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1377 int s_jquota_fmt; /* Format of quota to use */ 1378 #endif 1379 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1380 struct rb_root system_blks; 1381 1382 #ifdef EXTENTS_STATS 1383 /* ext4 extents stats */ 1384 unsigned long s_ext_min; 1385 unsigned long s_ext_max; 1386 unsigned long s_depth_max; 1387 spinlock_t s_ext_stats_lock; 1388 unsigned long s_ext_blocks; 1389 unsigned long s_ext_extents; 1390 #endif 1391 1392 /* for buddy allocator */ 1393 struct ext4_group_info ***s_group_info; 1394 struct inode *s_buddy_cache; 1395 spinlock_t s_md_lock; 1396 unsigned short *s_mb_offsets; 1397 unsigned int *s_mb_maxs; 1398 unsigned int s_group_info_size; 1399 1400 /* tunables */ 1401 unsigned long s_stripe; 1402 unsigned int s_mb_stream_request; 1403 unsigned int s_mb_max_to_scan; 1404 unsigned int s_mb_min_to_scan; 1405 unsigned int s_mb_stats; 1406 unsigned int s_mb_order2_reqs; 1407 unsigned int s_mb_group_prealloc; 1408 unsigned int s_max_dir_size_kb; 1409 /* where last allocation was done - for stream allocation */ 1410 unsigned long s_mb_last_group; 1411 unsigned long s_mb_last_start; 1412 1413 /* stats for buddy allocator */ 1414 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1415 atomic_t s_bal_success; /* we found long enough chunks */ 1416 atomic_t s_bal_allocated; /* in blocks */ 1417 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1418 atomic_t s_bal_goals; /* goal hits */ 1419 atomic_t s_bal_breaks; /* too long searches */ 1420 atomic_t s_bal_2orders; /* 2^order hits */ 1421 spinlock_t s_bal_lock; 1422 unsigned long s_mb_buddies_generated; 1423 unsigned long long s_mb_generation_time; 1424 atomic_t s_mb_lost_chunks; 1425 atomic_t s_mb_preallocated; 1426 atomic_t s_mb_discarded; 1427 atomic_t s_lock_busy; 1428 1429 /* locality groups */ 1430 struct ext4_locality_group __percpu *s_locality_groups; 1431 1432 /* for write statistics */ 1433 unsigned long s_sectors_written_start; 1434 u64 s_kbytes_written; 1435 1436 /* the size of zero-out chunk */ 1437 unsigned int s_extent_max_zeroout_kb; 1438 1439 unsigned int s_log_groups_per_flex; 1440 struct flex_groups *s_flex_groups; 1441 ext4_group_t s_flex_groups_allocated; 1442 1443 /* workqueue for reserved extent conversions (buffered io) */ 1444 struct workqueue_struct *rsv_conversion_wq; 1445 1446 /* timer for periodic error stats printing */ 1447 struct timer_list s_err_report; 1448 1449 /* Lazy inode table initialization info */ 1450 struct ext4_li_request *s_li_request; 1451 /* Wait multiplier for lazy initialization thread */ 1452 unsigned int s_li_wait_mult; 1453 1454 /* Kernel thread for multiple mount protection */ 1455 struct task_struct *s_mmp_tsk; 1456 1457 /* record the last minlen when FITRIM is called. */ 1458 atomic_t s_last_trim_minblks; 1459 1460 /* Reference to checksum algorithm driver via cryptoapi */ 1461 struct crypto_shash *s_chksum_driver; 1462 1463 /* Precomputed FS UUID checksum for seeding other checksums */ 1464 __u32 s_csum_seed; 1465 1466 /* Reclaim extents from extent status tree */ 1467 struct shrinker s_es_shrinker; 1468 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1469 long s_es_nr_inode; 1470 struct ext4_es_stats s_es_stats; 1471 struct mb_cache *s_mb_cache; 1472 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1473 1474 /* Ratelimit ext4 messages. */ 1475 struct ratelimit_state s_err_ratelimit_state; 1476 struct ratelimit_state s_warning_ratelimit_state; 1477 struct ratelimit_state s_msg_ratelimit_state; 1478 }; 1479 1480 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1481 { 1482 return sb->s_fs_info; 1483 } 1484 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1485 { 1486 return container_of(inode, struct ext4_inode_info, vfs_inode); 1487 } 1488 1489 static inline struct timespec ext4_current_time(struct inode *inode) 1490 { 1491 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1492 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1493 } 1494 1495 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1496 { 1497 return ino == EXT4_ROOT_INO || 1498 ino == EXT4_USR_QUOTA_INO || 1499 ino == EXT4_GRP_QUOTA_INO || 1500 ino == EXT4_BOOT_LOADER_INO || 1501 ino == EXT4_JOURNAL_INO || 1502 ino == EXT4_RESIZE_INO || 1503 (ino >= EXT4_FIRST_INO(sb) && 1504 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1505 } 1506 1507 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1508 struct ext4_io_end *io_end) 1509 { 1510 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1511 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1512 atomic_inc(&EXT4_I(inode)->i_unwritten); 1513 } 1514 } 1515 1516 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1517 { 1518 return inode->i_private; 1519 } 1520 1521 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1522 { 1523 inode->i_private = io; 1524 } 1525 1526 /* 1527 * Inode dynamic state flags 1528 */ 1529 enum { 1530 EXT4_STATE_JDATA, /* journaled data exists */ 1531 EXT4_STATE_NEW, /* inode is newly created */ 1532 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1533 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1534 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1535 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1536 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1537 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1538 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1539 nolocking */ 1540 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1541 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1542 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1543 }; 1544 1545 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1546 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1547 { \ 1548 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1549 } \ 1550 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1551 { \ 1552 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1553 } \ 1554 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1555 { \ 1556 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1557 } 1558 1559 /* Add these declarations here only so that these functions can be 1560 * found by name. Otherwise, they are very hard to locate. */ 1561 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1562 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1563 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1564 EXT4_INODE_BIT_FNS(flag, flags, 0) 1565 1566 /* Add these declarations here only so that these functions can be 1567 * found by name. Otherwise, they are very hard to locate. */ 1568 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1569 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1570 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1571 #if (BITS_PER_LONG < 64) 1572 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1573 1574 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1575 { 1576 (ei)->i_state_flags = 0; 1577 } 1578 #else 1579 EXT4_INODE_BIT_FNS(state, flags, 32) 1580 1581 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1582 { 1583 /* We depend on the fact that callers will set i_flags */ 1584 } 1585 #endif 1586 #else 1587 /* Assume that user mode programs are passing in an ext4fs superblock, not 1588 * a kernel struct super_block. This will allow us to call the feature-test 1589 * macros from user land. */ 1590 #define EXT4_SB(sb) (sb) 1591 #endif 1592 1593 /* 1594 * Returns true if the inode is inode is encrypted 1595 */ 1596 static inline int ext4_encrypted_inode(struct inode *inode) 1597 { 1598 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1599 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1600 #else 1601 return 0; 1602 #endif 1603 } 1604 1605 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1606 1607 /* 1608 * Codes for operating systems 1609 */ 1610 #define EXT4_OS_LINUX 0 1611 #define EXT4_OS_HURD 1 1612 #define EXT4_OS_MASIX 2 1613 #define EXT4_OS_FREEBSD 3 1614 #define EXT4_OS_LITES 4 1615 1616 /* 1617 * Revision levels 1618 */ 1619 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1620 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1621 1622 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1623 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1624 1625 #define EXT4_GOOD_OLD_INODE_SIZE 128 1626 1627 /* 1628 * Feature set definitions 1629 */ 1630 1631 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */ 1632 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1633 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1634 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1635 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1636 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1637 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1638 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1639 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1640 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1641 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1642 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1643 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1644 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1645 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1646 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1647 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1648 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1649 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1650 1651 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1652 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1653 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1654 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1655 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1656 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1657 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1658 1659 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1660 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1661 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1662 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1663 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1664 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1665 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1666 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1667 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1668 /* 1669 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1670 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1671 * all other data structures' checksums. However, the METADATA_CSUM and 1672 * GDT_CSUM bits are mutually exclusive. 1673 */ 1674 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1675 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1676 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1677 1678 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1679 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1680 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1681 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1682 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1683 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1684 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1685 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1686 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1687 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1688 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1689 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1690 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1691 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1692 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1693 1694 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1695 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1696 { \ 1697 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1698 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1699 } \ 1700 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1701 { \ 1702 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1703 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1704 } \ 1705 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1706 { \ 1707 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1708 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1709 } 1710 1711 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1712 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1713 { \ 1714 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1715 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1716 } \ 1717 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1718 { \ 1719 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1720 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1721 } \ 1722 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1723 { \ 1724 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1725 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1726 } 1727 1728 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1729 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1730 { \ 1731 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1732 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1733 } \ 1734 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1735 { \ 1736 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1737 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1738 } \ 1739 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1740 { \ 1741 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1742 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1743 } 1744 1745 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1746 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1747 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1748 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1749 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1750 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1751 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1752 1753 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1754 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1755 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1756 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1757 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1758 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1759 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1760 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1761 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1762 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1763 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1764 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1765 1766 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1767 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1768 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1769 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1770 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1771 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1772 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1773 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1774 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1775 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1776 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1777 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1778 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1779 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1780 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1781 1782 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1783 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1784 EXT4_FEATURE_INCOMPAT_META_BG) 1785 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1786 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1787 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1788 1789 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1790 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1791 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1792 EXT4_FEATURE_INCOMPAT_META_BG) 1793 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1794 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1795 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1796 1797 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1798 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1799 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1800 EXT4_FEATURE_INCOMPAT_META_BG| \ 1801 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1802 EXT4_FEATURE_INCOMPAT_64BIT| \ 1803 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1804 EXT4_FEATURE_INCOMPAT_MMP | \ 1805 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1806 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1807 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1808 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1809 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1810 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1811 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1812 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1813 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1814 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1815 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1816 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1817 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1818 EXT4_FEATURE_RO_COMPAT_PROJECT) 1819 1820 #define EXTN_FEATURE_FUNCS(ver) \ 1821 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1822 { \ 1823 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1824 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1825 } \ 1826 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1827 { \ 1828 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1829 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1830 } \ 1831 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1832 { \ 1833 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1834 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1835 } 1836 1837 EXTN_FEATURE_FUNCS(2) 1838 EXTN_FEATURE_FUNCS(3) 1839 EXTN_FEATURE_FUNCS(4) 1840 1841 static inline bool ext4_has_compat_features(struct super_block *sb) 1842 { 1843 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1844 } 1845 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1846 { 1847 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1848 } 1849 static inline bool ext4_has_incompat_features(struct super_block *sb) 1850 { 1851 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1852 } 1853 1854 /* 1855 * Default values for user and/or group using reserved blocks 1856 */ 1857 #define EXT4_DEF_RESUID 0 1858 #define EXT4_DEF_RESGID 0 1859 1860 /* 1861 * Default project ID 1862 */ 1863 #define EXT4_DEF_PROJID 0 1864 1865 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1866 1867 /* 1868 * Default mount options 1869 */ 1870 #define EXT4_DEFM_DEBUG 0x0001 1871 #define EXT4_DEFM_BSDGROUPS 0x0002 1872 #define EXT4_DEFM_XATTR_USER 0x0004 1873 #define EXT4_DEFM_ACL 0x0008 1874 #define EXT4_DEFM_UID16 0x0010 1875 #define EXT4_DEFM_JMODE 0x0060 1876 #define EXT4_DEFM_JMODE_DATA 0x0020 1877 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1878 #define EXT4_DEFM_JMODE_WBACK 0x0060 1879 #define EXT4_DEFM_NOBARRIER 0x0100 1880 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1881 #define EXT4_DEFM_DISCARD 0x0400 1882 #define EXT4_DEFM_NODELALLOC 0x0800 1883 1884 /* 1885 * Default journal batch times 1886 */ 1887 #define EXT4_DEF_MIN_BATCH_TIME 0 1888 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1889 1890 /* 1891 * Minimum number of groups in a flexgroup before we separate out 1892 * directories into the first block group of a flexgroup 1893 */ 1894 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1895 1896 /* 1897 * Structure of a directory entry 1898 */ 1899 #define EXT4_NAME_LEN 255 1900 1901 struct ext4_dir_entry { 1902 __le32 inode; /* Inode number */ 1903 __le16 rec_len; /* Directory entry length */ 1904 __le16 name_len; /* Name length */ 1905 char name[EXT4_NAME_LEN]; /* File name */ 1906 }; 1907 1908 /* 1909 * The new version of the directory entry. Since EXT4 structures are 1910 * stored in intel byte order, and the name_len field could never be 1911 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1912 * file_type field. 1913 */ 1914 struct ext4_dir_entry_2 { 1915 __le32 inode; /* Inode number */ 1916 __le16 rec_len; /* Directory entry length */ 1917 __u8 name_len; /* Name length */ 1918 __u8 file_type; 1919 char name[EXT4_NAME_LEN]; /* File name */ 1920 }; 1921 1922 /* 1923 * This is a bogus directory entry at the end of each leaf block that 1924 * records checksums. 1925 */ 1926 struct ext4_dir_entry_tail { 1927 __le32 det_reserved_zero1; /* Pretend to be unused */ 1928 __le16 det_rec_len; /* 12 */ 1929 __u8 det_reserved_zero2; /* Zero name length */ 1930 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1931 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1932 }; 1933 1934 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1935 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1936 ((blocksize) - \ 1937 sizeof(struct ext4_dir_entry_tail)))) 1938 1939 /* 1940 * Ext4 directory file types. Only the low 3 bits are used. The 1941 * other bits are reserved for now. 1942 */ 1943 #define EXT4_FT_UNKNOWN 0 1944 #define EXT4_FT_REG_FILE 1 1945 #define EXT4_FT_DIR 2 1946 #define EXT4_FT_CHRDEV 3 1947 #define EXT4_FT_BLKDEV 4 1948 #define EXT4_FT_FIFO 5 1949 #define EXT4_FT_SOCK 6 1950 #define EXT4_FT_SYMLINK 7 1951 1952 #define EXT4_FT_MAX 8 1953 1954 #define EXT4_FT_DIR_CSUM 0xDE 1955 1956 /* 1957 * EXT4_DIR_PAD defines the directory entries boundaries 1958 * 1959 * NOTE: It must be a multiple of 4 1960 */ 1961 #define EXT4_DIR_PAD 4 1962 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1963 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1964 ~EXT4_DIR_ROUND) 1965 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1966 1967 /* 1968 * If we ever get support for fs block sizes > page_size, we'll need 1969 * to remove the #if statements in the next two functions... 1970 */ 1971 static inline unsigned int 1972 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1973 { 1974 unsigned len = le16_to_cpu(dlen); 1975 1976 #if (PAGE_CACHE_SIZE >= 65536) 1977 if (len == EXT4_MAX_REC_LEN || len == 0) 1978 return blocksize; 1979 return (len & 65532) | ((len & 3) << 16); 1980 #else 1981 return len; 1982 #endif 1983 } 1984 1985 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1986 { 1987 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1988 BUG(); 1989 #if (PAGE_CACHE_SIZE >= 65536) 1990 if (len < 65536) 1991 return cpu_to_le16(len); 1992 if (len == blocksize) { 1993 if (blocksize == 65536) 1994 return cpu_to_le16(EXT4_MAX_REC_LEN); 1995 else 1996 return cpu_to_le16(0); 1997 } 1998 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1999 #else 2000 return cpu_to_le16(len); 2001 #endif 2002 } 2003 2004 /* 2005 * Hash Tree Directory indexing 2006 * (c) Daniel Phillips, 2001 2007 */ 2008 2009 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2010 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2011 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 2012 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2013 2014 /* Legal values for the dx_root hash_version field: */ 2015 2016 #define DX_HASH_LEGACY 0 2017 #define DX_HASH_HALF_MD4 1 2018 #define DX_HASH_TEA 2 2019 #define DX_HASH_LEGACY_UNSIGNED 3 2020 #define DX_HASH_HALF_MD4_UNSIGNED 4 2021 #define DX_HASH_TEA_UNSIGNED 5 2022 2023 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2024 const void *address, unsigned int length) 2025 { 2026 struct { 2027 struct shash_desc shash; 2028 char ctx[4]; 2029 } desc; 2030 int err; 2031 2032 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2033 2034 desc.shash.tfm = sbi->s_chksum_driver; 2035 desc.shash.flags = 0; 2036 *(u32 *)desc.ctx = crc; 2037 2038 err = crypto_shash_update(&desc.shash, address, length); 2039 BUG_ON(err); 2040 2041 return *(u32 *)desc.ctx; 2042 } 2043 2044 #ifdef __KERNEL__ 2045 2046 /* hash info structure used by the directory hash */ 2047 struct dx_hash_info 2048 { 2049 u32 hash; 2050 u32 minor_hash; 2051 int hash_version; 2052 u32 *seed; 2053 }; 2054 2055 2056 /* 32 and 64 bit signed EOF for dx directories */ 2057 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2058 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2059 2060 2061 /* 2062 * Control parameters used by ext4_htree_next_block 2063 */ 2064 #define HASH_NB_ALWAYS 1 2065 2066 struct ext4_filename { 2067 const struct qstr *usr_fname; 2068 struct ext4_str disk_name; 2069 struct dx_hash_info hinfo; 2070 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2071 struct ext4_str crypto_buf; 2072 #endif 2073 }; 2074 2075 #define fname_name(p) ((p)->disk_name.name) 2076 #define fname_len(p) ((p)->disk_name.len) 2077 2078 /* 2079 * Describe an inode's exact location on disk and in memory 2080 */ 2081 struct ext4_iloc 2082 { 2083 struct buffer_head *bh; 2084 unsigned long offset; 2085 ext4_group_t block_group; 2086 }; 2087 2088 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2089 { 2090 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2091 } 2092 2093 /* 2094 * This structure is stuffed into the struct file's private_data field 2095 * for directories. It is where we put information so that we can do 2096 * readdir operations in hash tree order. 2097 */ 2098 struct dir_private_info { 2099 struct rb_root root; 2100 struct rb_node *curr_node; 2101 struct fname *extra_fname; 2102 loff_t last_pos; 2103 __u32 curr_hash; 2104 __u32 curr_minor_hash; 2105 __u32 next_hash; 2106 }; 2107 2108 /* calculate the first block number of the group */ 2109 static inline ext4_fsblk_t 2110 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2111 { 2112 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2113 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2114 } 2115 2116 /* 2117 * Special error return code only used by dx_probe() and its callers. 2118 */ 2119 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2120 2121 /* 2122 * Timeout and state flag for lazy initialization inode thread. 2123 */ 2124 #define EXT4_DEF_LI_WAIT_MULT 10 2125 #define EXT4_DEF_LI_MAX_START_DELAY 5 2126 #define EXT4_LAZYINIT_QUIT 0x0001 2127 #define EXT4_LAZYINIT_RUNNING 0x0002 2128 2129 /* 2130 * Lazy inode table initialization info 2131 */ 2132 struct ext4_lazy_init { 2133 unsigned long li_state; 2134 struct list_head li_request_list; 2135 struct mutex li_list_mtx; 2136 }; 2137 2138 struct ext4_li_request { 2139 struct super_block *lr_super; 2140 struct ext4_sb_info *lr_sbi; 2141 ext4_group_t lr_next_group; 2142 struct list_head lr_request; 2143 unsigned long lr_next_sched; 2144 unsigned long lr_timeout; 2145 }; 2146 2147 struct ext4_features { 2148 struct kobject f_kobj; 2149 struct completion f_kobj_unregister; 2150 }; 2151 2152 /* 2153 * This structure will be used for multiple mount protection. It will be 2154 * written into the block number saved in the s_mmp_block field in the 2155 * superblock. Programs that check MMP should assume that if 2156 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2157 * to use the filesystem, regardless of how old the timestamp is. 2158 */ 2159 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2160 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2161 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2162 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2163 2164 struct mmp_struct { 2165 __le32 mmp_magic; /* Magic number for MMP */ 2166 __le32 mmp_seq; /* Sequence no. updated periodically */ 2167 2168 /* 2169 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2170 * purposes and do not affect the correctness of the algorithm 2171 */ 2172 __le64 mmp_time; /* Time last updated */ 2173 char mmp_nodename[64]; /* Node which last updated MMP block */ 2174 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2175 2176 /* 2177 * mmp_check_interval is used to verify if the MMP block has been 2178 * updated on the block device. The value is updated based on the 2179 * maximum time to write the MMP block during an update cycle. 2180 */ 2181 __le16 mmp_check_interval; 2182 2183 __le16 mmp_pad1; 2184 __le32 mmp_pad2[226]; 2185 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2186 }; 2187 2188 /* arguments passed to the mmp thread */ 2189 struct mmpd_data { 2190 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2191 struct super_block *sb; /* super block of the fs */ 2192 }; 2193 2194 /* 2195 * Check interval multiplier 2196 * The MMP block is written every update interval and initially checked every 2197 * update interval x the multiplier (the value is then adapted based on the 2198 * write latency). The reason is that writes can be delayed under load and we 2199 * don't want readers to incorrectly assume that the filesystem is no longer 2200 * in use. 2201 */ 2202 #define EXT4_MMP_CHECK_MULT 2UL 2203 2204 /* 2205 * Minimum interval for MMP checking in seconds. 2206 */ 2207 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2208 2209 /* 2210 * Maximum interval for MMP checking in seconds. 2211 */ 2212 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2213 2214 /* 2215 * Function prototypes 2216 */ 2217 2218 /* 2219 * Ok, these declarations are also in <linux/kernel.h> but none of the 2220 * ext4 source programs needs to include it so they are duplicated here. 2221 */ 2222 # define NORET_TYPE /**/ 2223 # define ATTRIB_NORET __attribute__((noreturn)) 2224 # define NORET_AND noreturn, 2225 2226 /* bitmap.c */ 2227 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2228 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2229 struct ext4_group_desc *gdp, 2230 struct buffer_head *bh, int sz); 2231 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2232 struct ext4_group_desc *gdp, 2233 struct buffer_head *bh, int sz); 2234 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2235 struct ext4_group_desc *gdp, 2236 struct buffer_head *bh); 2237 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2238 struct ext4_group_desc *gdp, 2239 struct buffer_head *bh); 2240 2241 /* balloc.c */ 2242 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2243 ext4_fsblk_t blocknr, 2244 ext4_group_t *blockgrpp, 2245 ext4_grpblk_t *offsetp); 2246 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2247 ext4_fsblk_t block); 2248 2249 extern unsigned int ext4_block_group(struct super_block *sb, 2250 ext4_fsblk_t blocknr); 2251 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2252 ext4_fsblk_t blocknr); 2253 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2254 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2255 ext4_group_t group); 2256 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2257 ext4_fsblk_t goal, 2258 unsigned int flags, 2259 unsigned long *count, 2260 int *errp); 2261 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2262 s64 nclusters, unsigned int flags); 2263 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2264 extern void ext4_check_blocks_bitmap(struct super_block *); 2265 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2266 ext4_group_t block_group, 2267 struct buffer_head ** bh); 2268 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2269 2270 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2271 ext4_group_t block_group); 2272 extern int ext4_wait_block_bitmap(struct super_block *sb, 2273 ext4_group_t block_group, 2274 struct buffer_head *bh); 2275 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2276 ext4_group_t block_group); 2277 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2278 ext4_group_t block_group, 2279 struct ext4_group_desc *gdp); 2280 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2281 2282 /* crypto_policy.c */ 2283 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2284 struct inode *child); 2285 int ext4_inherit_context(struct inode *parent, struct inode *child); 2286 void ext4_to_hex(char *dst, char *src, size_t src_size); 2287 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2288 struct inode *inode); 2289 int ext4_get_policy(struct inode *inode, 2290 struct ext4_encryption_policy *policy); 2291 2292 /* crypto.c */ 2293 extern struct kmem_cache *ext4_crypt_info_cachep; 2294 bool ext4_valid_contents_enc_mode(uint32_t mode); 2295 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2296 extern struct workqueue_struct *ext4_read_workqueue; 2297 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); 2298 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2299 void ext4_restore_control_page(struct page *data_page); 2300 struct page *ext4_encrypt(struct inode *inode, 2301 struct page *plaintext_page); 2302 int ext4_decrypt(struct page *page); 2303 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk, 2304 ext4_fsblk_t pblk, ext4_lblk_t len); 2305 2306 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2307 int ext4_init_crypto(void); 2308 void ext4_exit_crypto(void); 2309 static inline int ext4_sb_has_crypto(struct super_block *sb) 2310 { 2311 return ext4_has_feature_encrypt(sb); 2312 } 2313 #else 2314 static inline int ext4_init_crypto(void) { return 0; } 2315 static inline void ext4_exit_crypto(void) { } 2316 static inline int ext4_sb_has_crypto(struct super_block *sb) 2317 { 2318 return 0; 2319 } 2320 #endif 2321 2322 /* crypto_fname.c */ 2323 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2324 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2325 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); 2326 int ext4_fname_crypto_alloc_buffer(struct inode *inode, 2327 u32 ilen, struct ext4_str *crypto_str); 2328 int _ext4_fname_disk_to_usr(struct inode *inode, 2329 struct dx_hash_info *hinfo, 2330 const struct ext4_str *iname, 2331 struct ext4_str *oname); 2332 int ext4_fname_disk_to_usr(struct inode *inode, 2333 struct dx_hash_info *hinfo, 2334 const struct ext4_dir_entry_2 *de, 2335 struct ext4_str *oname); 2336 int ext4_fname_usr_to_disk(struct inode *inode, 2337 const struct qstr *iname, 2338 struct ext4_str *oname); 2339 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2340 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2341 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2342 int lookup, struct ext4_filename *fname); 2343 void ext4_fname_free_filename(struct ext4_filename *fname); 2344 #else 2345 static inline 2346 int ext4_setup_fname_crypto(struct inode *inode) 2347 { 2348 return 0; 2349 } 2350 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2351 static inline int ext4_fname_setup_filename(struct inode *dir, 2352 const struct qstr *iname, 2353 int lookup, struct ext4_filename *fname) 2354 { 2355 fname->usr_fname = iname; 2356 fname->disk_name.name = (unsigned char *) iname->name; 2357 fname->disk_name.len = iname->len; 2358 return 0; 2359 } 2360 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2361 #endif 2362 2363 2364 /* crypto_key.c */ 2365 void ext4_free_crypt_info(struct ext4_crypt_info *ci); 2366 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); 2367 int _ext4_get_encryption_info(struct inode *inode); 2368 2369 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2370 int ext4_has_encryption_key(struct inode *inode); 2371 2372 static inline int ext4_get_encryption_info(struct inode *inode) 2373 { 2374 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; 2375 2376 if (!ci || 2377 (ci->ci_keyring_key && 2378 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | 2379 (1 << KEY_FLAG_REVOKED) | 2380 (1 << KEY_FLAG_DEAD))))) 2381 return _ext4_get_encryption_info(inode); 2382 return 0; 2383 } 2384 2385 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2386 { 2387 return EXT4_I(inode)->i_crypt_info; 2388 } 2389 2390 #else 2391 static inline int ext4_has_encryption_key(struct inode *inode) 2392 { 2393 return 0; 2394 } 2395 static inline int ext4_get_encryption_info(struct inode *inode) 2396 { 2397 return 0; 2398 } 2399 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2400 { 2401 return NULL; 2402 } 2403 #endif 2404 2405 2406 /* dir.c */ 2407 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2408 struct file *, 2409 struct ext4_dir_entry_2 *, 2410 struct buffer_head *, char *, int, 2411 unsigned int); 2412 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2413 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2414 (de), (bh), (buf), (size), (offset))) 2415 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2416 __u32 minor_hash, 2417 struct ext4_dir_entry_2 *dirent, 2418 struct ext4_str *ent_name); 2419 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2420 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2421 struct buffer_head *bh, 2422 void *buf, int buf_size, 2423 struct ext4_filename *fname, 2424 struct ext4_dir_entry_2 **dest_de); 2425 int ext4_insert_dentry(struct inode *dir, 2426 struct inode *inode, 2427 struct ext4_dir_entry_2 *de, 2428 int buf_size, 2429 struct ext4_filename *fname); 2430 static inline void ext4_update_dx_flag(struct inode *inode) 2431 { 2432 if (!ext4_has_feature_dir_index(inode->i_sb)) 2433 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2434 } 2435 static unsigned char ext4_filetype_table[] = { 2436 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2437 }; 2438 2439 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2440 { 2441 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2442 return DT_UNKNOWN; 2443 2444 return ext4_filetype_table[filetype]; 2445 } 2446 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2447 void *buf, int buf_size); 2448 2449 /* fsync.c */ 2450 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2451 2452 /* hash.c */ 2453 extern int ext4fs_dirhash(const char *name, int len, struct 2454 dx_hash_info *hinfo); 2455 2456 /* ialloc.c */ 2457 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2458 const struct qstr *qstr, __u32 goal, 2459 uid_t *owner, int handle_type, 2460 unsigned int line_no, int nblocks); 2461 2462 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2463 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2464 0, 0, 0) 2465 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2466 type, nblocks) \ 2467 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2468 (type), __LINE__, (nblocks)) 2469 2470 2471 extern void ext4_free_inode(handle_t *, struct inode *); 2472 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2473 extern unsigned long ext4_count_free_inodes(struct super_block *); 2474 extern unsigned long ext4_count_dirs(struct super_block *); 2475 extern void ext4_check_inodes_bitmap(struct super_block *); 2476 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2477 extern int ext4_init_inode_table(struct super_block *sb, 2478 ext4_group_t group, int barrier); 2479 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2480 2481 /* mballoc.c */ 2482 extern const struct file_operations ext4_seq_mb_groups_fops; 2483 extern long ext4_mb_stats; 2484 extern long ext4_mb_max_to_scan; 2485 extern int ext4_mb_init(struct super_block *); 2486 extern int ext4_mb_release(struct super_block *); 2487 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2488 struct ext4_allocation_request *, int *); 2489 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2490 extern void ext4_discard_preallocations(struct inode *); 2491 extern int __init ext4_init_mballoc(void); 2492 extern void ext4_exit_mballoc(void); 2493 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2494 struct buffer_head *bh, ext4_fsblk_t block, 2495 unsigned long count, int flags); 2496 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2497 ext4_group_t ngroups); 2498 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2499 ext4_group_t i, struct ext4_group_desc *desc); 2500 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2501 ext4_fsblk_t block, unsigned long count); 2502 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2503 2504 /* inode.c */ 2505 int ext4_inode_is_fast_symlink(struct inode *inode); 2506 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2507 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2508 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2509 struct buffer_head *bh_result, int create); 2510 int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock, 2511 struct buffer_head *bh_result, int create); 2512 int ext4_get_block(struct inode *inode, sector_t iblock, 2513 struct buffer_head *bh_result, int create); 2514 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2515 struct buffer_head *bh, int create); 2516 int ext4_walk_page_buffers(handle_t *handle, 2517 struct buffer_head *head, 2518 unsigned from, 2519 unsigned to, 2520 int *partial, 2521 int (*fn)(handle_t *handle, 2522 struct buffer_head *bh)); 2523 int do_journal_get_write_access(handle_t *handle, 2524 struct buffer_head *bh); 2525 #define FALL_BACK_TO_NONDELALLOC 1 2526 #define CONVERT_INLINE_DATA 2 2527 2528 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2529 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2530 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2531 extern int ext4_setattr(struct dentry *, struct iattr *); 2532 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2533 struct kstat *stat); 2534 extern void ext4_evict_inode(struct inode *); 2535 extern void ext4_clear_inode(struct inode *); 2536 extern int ext4_sync_inode(handle_t *, struct inode *); 2537 extern void ext4_dirty_inode(struct inode *, int); 2538 extern int ext4_change_inode_journal_flag(struct inode *, int); 2539 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2540 extern int ext4_inode_attach_jinode(struct inode *inode); 2541 extern int ext4_can_truncate(struct inode *inode); 2542 extern void ext4_truncate(struct inode *); 2543 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2544 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2545 extern void ext4_set_inode_flags(struct inode *); 2546 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2547 extern int ext4_alloc_da_blocks(struct inode *inode); 2548 extern void ext4_set_aops(struct inode *inode); 2549 extern int ext4_writepage_trans_blocks(struct inode *); 2550 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2551 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2552 loff_t lstart, loff_t lend); 2553 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2554 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 2555 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2556 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2557 extern void ext4_da_update_reserve_space(struct inode *inode, 2558 int used, int quota_claim); 2559 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2560 ext4_fsblk_t pblk, ext4_lblk_t len); 2561 2562 /* indirect.c */ 2563 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2564 struct ext4_map_blocks *map, int flags); 2565 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 2566 loff_t offset); 2567 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2568 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2569 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2570 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2571 ext4_lblk_t start, ext4_lblk_t end); 2572 2573 /* ioctl.c */ 2574 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2575 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2576 2577 /* migrate.c */ 2578 extern int ext4_ext_migrate(struct inode *); 2579 extern int ext4_ind_migrate(struct inode *inode); 2580 2581 /* namei.c */ 2582 extern int ext4_dirent_csum_verify(struct inode *inode, 2583 struct ext4_dir_entry *dirent); 2584 extern int ext4_orphan_add(handle_t *, struct inode *); 2585 extern int ext4_orphan_del(handle_t *, struct inode *); 2586 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2587 __u32 start_minor_hash, __u32 *next_hash); 2588 extern int ext4_search_dir(struct buffer_head *bh, 2589 char *search_buf, 2590 int buf_size, 2591 struct inode *dir, 2592 struct ext4_filename *fname, 2593 const struct qstr *d_name, 2594 unsigned int offset, 2595 struct ext4_dir_entry_2 **res_dir); 2596 extern int ext4_generic_delete_entry(handle_t *handle, 2597 struct inode *dir, 2598 struct ext4_dir_entry_2 *de_del, 2599 struct buffer_head *bh, 2600 void *entry_buf, 2601 int buf_size, 2602 int csum_size); 2603 extern int ext4_empty_dir(struct inode *inode); 2604 2605 /* resize.c */ 2606 extern int ext4_group_add(struct super_block *sb, 2607 struct ext4_new_group_data *input); 2608 extern int ext4_group_extend(struct super_block *sb, 2609 struct ext4_super_block *es, 2610 ext4_fsblk_t n_blocks_count); 2611 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2612 2613 /* super.c */ 2614 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2615 extern int ext4_calculate_overhead(struct super_block *sb); 2616 extern void ext4_superblock_csum_set(struct super_block *sb); 2617 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2618 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2619 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2620 ext4_group_t ngroup); 2621 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2622 char nbuf[16]); 2623 2624 extern __printf(4, 5) 2625 void __ext4_error(struct super_block *, const char *, unsigned int, 2626 const char *, ...); 2627 extern __printf(5, 6) 2628 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2629 const char *, ...); 2630 extern __printf(5, 6) 2631 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2632 const char *, ...); 2633 extern void __ext4_std_error(struct super_block *, const char *, 2634 unsigned int, int); 2635 extern __printf(4, 5) 2636 void __ext4_abort(struct super_block *, const char *, unsigned int, 2637 const char *, ...); 2638 extern __printf(4, 5) 2639 void __ext4_warning(struct super_block *, const char *, unsigned int, 2640 const char *, ...); 2641 extern __printf(4, 5) 2642 void __ext4_warning_inode(const struct inode *inode, const char *function, 2643 unsigned int line, const char *fmt, ...); 2644 extern __printf(3, 4) 2645 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2646 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2647 const char *, unsigned int, const char *); 2648 extern __printf(7, 8) 2649 void __ext4_grp_locked_error(const char *, unsigned int, 2650 struct super_block *, ext4_group_t, 2651 unsigned long, ext4_fsblk_t, 2652 const char *, ...); 2653 2654 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2655 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2656 2657 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2658 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2659 2660 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2661 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2662 2663 #ifdef CONFIG_PRINTK 2664 2665 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2666 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2667 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2668 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2669 #define ext4_error(sb, fmt, ...) \ 2670 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2671 #define ext4_abort(sb, fmt, ...) \ 2672 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2673 #define ext4_warning(sb, fmt, ...) \ 2674 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2675 #define ext4_warning_inode(inode, fmt, ...) \ 2676 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2677 #define ext4_msg(sb, level, fmt, ...) \ 2678 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2679 #define dump_mmp_msg(sb, mmp, msg) \ 2680 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2681 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2682 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2683 fmt, ##__VA_ARGS__) 2684 2685 #else 2686 2687 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2688 do { \ 2689 no_printk(fmt, ##__VA_ARGS__); \ 2690 __ext4_error_inode(inode, "", 0, block, " "); \ 2691 } while (0) 2692 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2693 do { \ 2694 no_printk(fmt, ##__VA_ARGS__); \ 2695 __ext4_error_file(file, "", 0, block, " "); \ 2696 } while (0) 2697 #define ext4_error(sb, fmt, ...) \ 2698 do { \ 2699 no_printk(fmt, ##__VA_ARGS__); \ 2700 __ext4_error(sb, "", 0, " "); \ 2701 } while (0) 2702 #define ext4_abort(sb, fmt, ...) \ 2703 do { \ 2704 no_printk(fmt, ##__VA_ARGS__); \ 2705 __ext4_abort(sb, "", 0, " "); \ 2706 } while (0) 2707 #define ext4_warning(sb, fmt, ...) \ 2708 do { \ 2709 no_printk(fmt, ##__VA_ARGS__); \ 2710 __ext4_warning(sb, "", 0, " "); \ 2711 } while (0) 2712 #define ext4_warning_inode(inode, fmt, ...) \ 2713 do { \ 2714 no_printk(fmt, ##__VA_ARGS__); \ 2715 __ext4_warning_inode(inode, "", 0, " "); \ 2716 } while (0) 2717 #define ext4_msg(sb, level, fmt, ...) \ 2718 do { \ 2719 no_printk(fmt, ##__VA_ARGS__); \ 2720 __ext4_msg(sb, "", " "); \ 2721 } while (0) 2722 #define dump_mmp_msg(sb, mmp, msg) \ 2723 __dump_mmp_msg(sb, mmp, "", 0, "") 2724 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2725 do { \ 2726 no_printk(fmt, ##__VA_ARGS__); \ 2727 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2728 } while (0) 2729 2730 #endif 2731 2732 extern void ext4_update_dynamic_rev(struct super_block *sb); 2733 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2734 __u32 compat); 2735 extern int ext4_update_rocompat_feature(handle_t *handle, 2736 struct super_block *sb, __u32 rocompat); 2737 extern int ext4_update_incompat_feature(handle_t *handle, 2738 struct super_block *sb, __u32 incompat); 2739 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2740 struct ext4_group_desc *bg); 2741 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2742 struct ext4_group_desc *bg); 2743 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2744 struct ext4_group_desc *bg); 2745 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2746 struct ext4_group_desc *bg); 2747 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2748 struct ext4_group_desc *bg); 2749 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2750 struct ext4_group_desc *bg); 2751 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2752 struct ext4_group_desc *bg); 2753 extern void ext4_block_bitmap_set(struct super_block *sb, 2754 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2755 extern void ext4_inode_bitmap_set(struct super_block *sb, 2756 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2757 extern void ext4_inode_table_set(struct super_block *sb, 2758 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2759 extern void ext4_free_group_clusters_set(struct super_block *sb, 2760 struct ext4_group_desc *bg, 2761 __u32 count); 2762 extern void ext4_free_inodes_set(struct super_block *sb, 2763 struct ext4_group_desc *bg, __u32 count); 2764 extern void ext4_used_dirs_set(struct super_block *sb, 2765 struct ext4_group_desc *bg, __u32 count); 2766 extern void ext4_itable_unused_set(struct super_block *sb, 2767 struct ext4_group_desc *bg, __u32 count); 2768 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2769 struct ext4_group_desc *gdp); 2770 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2771 struct ext4_group_desc *gdp); 2772 extern int ext4_register_li_request(struct super_block *sb, 2773 ext4_group_t first_not_zeroed); 2774 2775 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2776 { 2777 return ext4_has_feature_gdt_csum(sb) || 2778 EXT4_SB(sb)->s_chksum_driver != NULL; 2779 } 2780 2781 static inline int ext4_has_metadata_csum(struct super_block *sb) 2782 { 2783 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2784 !EXT4_SB(sb)->s_chksum_driver); 2785 2786 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2787 } 2788 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2789 { 2790 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2791 le32_to_cpu(es->s_blocks_count_lo); 2792 } 2793 2794 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2795 { 2796 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2797 le32_to_cpu(es->s_r_blocks_count_lo); 2798 } 2799 2800 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2801 { 2802 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2803 le32_to_cpu(es->s_free_blocks_count_lo); 2804 } 2805 2806 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2807 ext4_fsblk_t blk) 2808 { 2809 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2810 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2811 } 2812 2813 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2814 ext4_fsblk_t blk) 2815 { 2816 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2817 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2818 } 2819 2820 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2821 ext4_fsblk_t blk) 2822 { 2823 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2824 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2825 } 2826 2827 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2828 { 2829 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2830 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2831 le32_to_cpu(raw_inode->i_size_lo); 2832 else 2833 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2834 } 2835 2836 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2837 { 2838 raw_inode->i_size_lo = cpu_to_le32(i_size); 2839 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2840 } 2841 2842 static inline 2843 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2844 ext4_group_t group) 2845 { 2846 struct ext4_group_info ***grp_info; 2847 long indexv, indexh; 2848 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2849 grp_info = EXT4_SB(sb)->s_group_info; 2850 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2851 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2852 return grp_info[indexv][indexh]; 2853 } 2854 2855 /* 2856 * Reading s_groups_count requires using smp_rmb() afterwards. See 2857 * the locking protocol documented in the comments of ext4_group_add() 2858 * in resize.c 2859 */ 2860 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2861 { 2862 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2863 2864 smp_rmb(); 2865 return ngroups; 2866 } 2867 2868 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2869 ext4_group_t block_group) 2870 { 2871 return block_group >> sbi->s_log_groups_per_flex; 2872 } 2873 2874 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2875 { 2876 return 1 << sbi->s_log_groups_per_flex; 2877 } 2878 2879 #define ext4_std_error(sb, errno) \ 2880 do { \ 2881 if ((errno)) \ 2882 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2883 } while (0) 2884 2885 #ifdef CONFIG_SMP 2886 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2887 * counters. So we need to make sure we have free clusters more 2888 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2889 */ 2890 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2891 #else 2892 #define EXT4_FREECLUSTERS_WATERMARK 0 2893 #endif 2894 2895 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2896 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2897 { 2898 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2899 !inode_is_locked(inode)); 2900 down_write(&EXT4_I(inode)->i_data_sem); 2901 if (newsize > EXT4_I(inode)->i_disksize) 2902 EXT4_I(inode)->i_disksize = newsize; 2903 up_write(&EXT4_I(inode)->i_data_sem); 2904 } 2905 2906 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2907 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2908 { 2909 int changed = 0; 2910 2911 if (newsize > inode->i_size) { 2912 i_size_write(inode, newsize); 2913 changed = 1; 2914 } 2915 if (newsize > EXT4_I(inode)->i_disksize) { 2916 ext4_update_i_disksize(inode, newsize); 2917 changed |= 2; 2918 } 2919 return changed; 2920 } 2921 2922 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2923 loff_t len); 2924 2925 struct ext4_group_info { 2926 unsigned long bb_state; 2927 struct rb_root bb_free_root; 2928 ext4_grpblk_t bb_first_free; /* first free block */ 2929 ext4_grpblk_t bb_free; /* total free blocks */ 2930 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2931 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2932 struct list_head bb_prealloc_list; 2933 #ifdef DOUBLE_CHECK 2934 void *bb_bitmap; 2935 #endif 2936 struct rw_semaphore alloc_sem; 2937 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2938 * regions, index is order. 2939 * bb_counters[3] = 5 means 2940 * 5 free 8-block regions. */ 2941 }; 2942 2943 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2944 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2945 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2946 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2947 2948 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2949 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2950 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2951 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2952 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2953 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2954 2955 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2956 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2957 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2958 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2959 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2960 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2961 2962 #define EXT4_MAX_CONTENTION 8 2963 #define EXT4_CONTENTION_THRESHOLD 2 2964 2965 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2966 ext4_group_t group) 2967 { 2968 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2969 } 2970 2971 /* 2972 * Returns true if the filesystem is busy enough that attempts to 2973 * access the block group locks has run into contention. 2974 */ 2975 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2976 { 2977 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2978 } 2979 2980 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2981 { 2982 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2983 if (spin_trylock(lock)) 2984 /* 2985 * We're able to grab the lock right away, so drop the 2986 * lock contention counter. 2987 */ 2988 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2989 else { 2990 /* 2991 * The lock is busy, so bump the contention counter, 2992 * and then wait on the spin lock. 2993 */ 2994 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2995 EXT4_MAX_CONTENTION); 2996 spin_lock(lock); 2997 } 2998 } 2999 3000 static inline void ext4_unlock_group(struct super_block *sb, 3001 ext4_group_t group) 3002 { 3003 spin_unlock(ext4_group_lock_ptr(sb, group)); 3004 } 3005 3006 /* 3007 * Block validity checking 3008 */ 3009 #define ext4_check_indirect_blockref(inode, bh) \ 3010 ext4_check_blockref(__func__, __LINE__, inode, \ 3011 (__le32 *)(bh)->b_data, \ 3012 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3013 3014 #define ext4_ind_check_inode(inode) \ 3015 ext4_check_blockref(__func__, __LINE__, inode, \ 3016 EXT4_I(inode)->i_data, \ 3017 EXT4_NDIR_BLOCKS) 3018 3019 /* 3020 * Inodes and files operations 3021 */ 3022 3023 /* dir.c */ 3024 extern const struct file_operations ext4_dir_operations; 3025 3026 /* file.c */ 3027 extern const struct inode_operations ext4_file_inode_operations; 3028 extern const struct file_operations ext4_file_operations; 3029 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3030 3031 /* inline.c */ 3032 extern int ext4_get_max_inline_size(struct inode *inode); 3033 extern int ext4_find_inline_data_nolock(struct inode *inode); 3034 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3035 unsigned int len); 3036 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3037 3038 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3039 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3040 struct inode *inode, 3041 loff_t pos, unsigned len, 3042 unsigned flags, 3043 struct page **pagep); 3044 extern int ext4_write_inline_data_end(struct inode *inode, 3045 loff_t pos, unsigned len, 3046 unsigned copied, 3047 struct page *page); 3048 extern struct buffer_head * 3049 ext4_journalled_write_inline_data(struct inode *inode, 3050 unsigned len, 3051 struct page *page); 3052 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3053 struct inode *inode, 3054 loff_t pos, unsigned len, 3055 unsigned flags, 3056 struct page **pagep, 3057 void **fsdata); 3058 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3059 unsigned len, unsigned copied, 3060 struct page *page); 3061 extern int ext4_try_add_inline_entry(handle_t *handle, 3062 struct ext4_filename *fname, 3063 struct inode *dir, struct inode *inode); 3064 extern int ext4_try_create_inline_dir(handle_t *handle, 3065 struct inode *parent, 3066 struct inode *inode); 3067 extern int ext4_read_inline_dir(struct file *filp, 3068 struct dir_context *ctx, 3069 int *has_inline_data); 3070 extern int htree_inlinedir_to_tree(struct file *dir_file, 3071 struct inode *dir, ext4_lblk_t block, 3072 struct dx_hash_info *hinfo, 3073 __u32 start_hash, __u32 start_minor_hash, 3074 int *has_inline_data); 3075 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3076 struct ext4_filename *fname, 3077 const struct qstr *d_name, 3078 struct ext4_dir_entry_2 **res_dir, 3079 int *has_inline_data); 3080 extern int ext4_delete_inline_entry(handle_t *handle, 3081 struct inode *dir, 3082 struct ext4_dir_entry_2 *de_del, 3083 struct buffer_head *bh, 3084 int *has_inline_data); 3085 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 3086 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3087 struct ext4_dir_entry_2 **parent_de, 3088 int *retval); 3089 extern int ext4_inline_data_fiemap(struct inode *inode, 3090 struct fiemap_extent_info *fieinfo, 3091 int *has_inline, __u64 start, __u64 len); 3092 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3093 struct inode *inode, 3094 int needed); 3095 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3096 3097 extern int ext4_convert_inline_data(struct inode *inode); 3098 3099 static inline int ext4_has_inline_data(struct inode *inode) 3100 { 3101 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3102 EXT4_I(inode)->i_inline_off; 3103 } 3104 3105 /* namei.c */ 3106 extern const struct inode_operations ext4_dir_inode_operations; 3107 extern const struct inode_operations ext4_special_inode_operations; 3108 extern struct dentry *ext4_get_parent(struct dentry *child); 3109 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3110 struct ext4_dir_entry_2 *de, 3111 int blocksize, int csum_size, 3112 unsigned int parent_ino, int dotdot_real_len); 3113 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3114 unsigned int blocksize); 3115 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3116 struct inode *inode, 3117 struct buffer_head *bh); 3118 #define S_SHIFT 12 3119 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3120 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3121 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3122 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3123 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3124 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3125 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3126 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3127 }; 3128 3129 static inline void ext4_set_de_type(struct super_block *sb, 3130 struct ext4_dir_entry_2 *de, 3131 umode_t mode) { 3132 if (ext4_has_feature_filetype(sb)) 3133 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3134 } 3135 3136 /* readpages.c */ 3137 extern int ext4_mpage_readpages(struct address_space *mapping, 3138 struct list_head *pages, struct page *page, 3139 unsigned nr_pages); 3140 3141 /* symlink.c */ 3142 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3143 extern const struct inode_operations ext4_symlink_inode_operations; 3144 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3145 3146 /* sysfs.c */ 3147 extern int ext4_register_sysfs(struct super_block *sb); 3148 extern void ext4_unregister_sysfs(struct super_block *sb); 3149 extern int __init ext4_init_sysfs(void); 3150 extern void ext4_exit_sysfs(void); 3151 3152 /* block_validity */ 3153 extern void ext4_release_system_zone(struct super_block *sb); 3154 extern int ext4_setup_system_zone(struct super_block *sb); 3155 extern int __init ext4_init_system_zone(void); 3156 extern void ext4_exit_system_zone(void); 3157 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3158 ext4_fsblk_t start_blk, 3159 unsigned int count); 3160 extern int ext4_check_blockref(const char *, unsigned int, 3161 struct inode *, __le32 *, unsigned int); 3162 3163 /* extents.c */ 3164 struct ext4_ext_path; 3165 struct ext4_extent; 3166 3167 /* 3168 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3169 * __le32. 3170 */ 3171 #define EXT_MAX_BLOCKS 0xffffffff 3172 3173 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3174 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3175 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3176 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3177 struct ext4_map_blocks *map, int flags); 3178 extern void ext4_ext_truncate(handle_t *, struct inode *); 3179 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3180 ext4_lblk_t end); 3181 extern void ext4_ext_init(struct super_block *); 3182 extern void ext4_ext_release(struct super_block *); 3183 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3184 loff_t len); 3185 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3186 loff_t offset, ssize_t len); 3187 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3188 struct ext4_map_blocks *map, int flags); 3189 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3190 ext4_lblk_t lblocks); 3191 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3192 int num, 3193 struct ext4_ext_path *path); 3194 extern int ext4_can_extents_be_merged(struct inode *inode, 3195 struct ext4_extent *ex1, 3196 struct ext4_extent *ex2); 3197 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3198 struct ext4_ext_path **, 3199 struct ext4_extent *, int); 3200 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3201 struct ext4_ext_path **, 3202 int flags); 3203 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3204 extern int ext4_ext_check_inode(struct inode *inode); 3205 extern int ext4_find_delalloc_range(struct inode *inode, 3206 ext4_lblk_t lblk_start, 3207 ext4_lblk_t lblk_end); 3208 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3209 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3210 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3211 __u64 start, __u64 len); 3212 extern int ext4_ext_precache(struct inode *inode); 3213 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3214 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3215 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3216 struct inode *inode2, ext4_lblk_t lblk1, 3217 ext4_lblk_t lblk2, ext4_lblk_t count, 3218 int mark_unwritten,int *err); 3219 3220 /* move_extent.c */ 3221 extern void ext4_double_down_write_data_sem(struct inode *first, 3222 struct inode *second); 3223 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3224 struct inode *donor_inode); 3225 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3226 __u64 start_orig, __u64 start_donor, 3227 __u64 len, __u64 *moved_len); 3228 3229 /* page-io.c */ 3230 extern int __init ext4_init_pageio(void); 3231 extern void ext4_exit_pageio(void); 3232 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3233 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3234 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3235 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3236 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3237 struct writeback_control *wbc); 3238 extern void ext4_end_io_rsv_work(struct work_struct *work); 3239 extern void ext4_io_submit(struct ext4_io_submit *io); 3240 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3241 struct page *page, 3242 int len, 3243 struct writeback_control *wbc, 3244 bool keep_towrite); 3245 3246 /* mmp.c */ 3247 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3248 3249 /* 3250 * Add new method to test whether block and inode bitmaps are properly 3251 * initialized. With uninit_bg reading the block from disk is not enough 3252 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3253 */ 3254 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3255 3256 static inline int bitmap_uptodate(struct buffer_head *bh) 3257 { 3258 return (buffer_uptodate(bh) && 3259 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3260 } 3261 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3262 { 3263 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3264 } 3265 3266 /* 3267 * Disable DIO read nolock optimization, so new dioreaders will be forced 3268 * to grab i_mutex 3269 */ 3270 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3271 { 3272 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3273 smp_mb(); 3274 } 3275 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3276 { 3277 smp_mb(); 3278 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3279 } 3280 3281 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3282 3283 /* For ioend & aio unwritten conversion wait queues */ 3284 #define EXT4_WQ_HASH_SZ 37 3285 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3286 EXT4_WQ_HASH_SZ]) 3287 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 3288 EXT4_WQ_HASH_SZ]) 3289 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3290 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 3291 3292 #define EXT4_RESIZING 0 3293 extern int ext4_resize_begin(struct super_block *sb); 3294 extern void ext4_resize_end(struct super_block *sb); 3295 3296 #endif /* __KERNEL__ */ 3297 3298 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3299 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3300 3301 #endif /* _EXT4_H */ 3302