1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/version.h> 30 #include <linux/wait.h> 31 #include <linux/blockgroup_lock.h> 32 #include <linux/percpu_counter.h> 33 #include <linux/ratelimit.h> 34 #include <crypto/hash.h> 35 #include <linux/falloc.h> 36 #ifdef __KERNEL__ 37 #include <linux/compat.h> 38 #endif 39 40 /* 41 * The fourth extended filesystem constants/structures 42 */ 43 44 /* 45 * with AGGRESSIVE_CHECK allocator runs consistency checks over 46 * structures. these checks slow things down a lot 47 */ 48 #define AGGRESSIVE_CHECK__ 49 50 /* 51 * with DOUBLE_CHECK defined mballoc creates persistent in-core 52 * bitmaps, maintains and uses them to check for double allocations 53 */ 54 #define DOUBLE_CHECK__ 55 56 /* 57 * Define EXT4FS_DEBUG to produce debug messages 58 */ 59 #undef EXT4FS_DEBUG 60 61 /* 62 * Debug code 63 */ 64 #ifdef EXT4FS_DEBUG 65 #define ext4_debug(f, a...) \ 66 do { \ 67 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 68 __FILE__, __LINE__, __func__); \ 69 printk(KERN_DEBUG f, ## a); \ 70 } while (0) 71 #else 72 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 73 #endif 74 75 /* 76 * Turn on EXT_DEBUG to get lots of info about extents operations. 77 */ 78 #define EXT_DEBUG__ 79 #ifdef EXT_DEBUG 80 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 81 #else 82 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 83 #endif 84 85 /* data type for block offset of block group */ 86 typedef int ext4_grpblk_t; 87 88 /* data type for filesystem-wide blocks number */ 89 typedef unsigned long long ext4_fsblk_t; 90 91 /* data type for file logical block number */ 92 typedef __u32 ext4_lblk_t; 93 94 /* data type for block group number */ 95 typedef unsigned int ext4_group_t; 96 97 enum SHIFT_DIRECTION { 98 SHIFT_LEFT = 0, 99 SHIFT_RIGHT, 100 }; 101 102 /* 103 * Flags used in mballoc's allocation_context flags field. 104 * 105 * Also used to show what's going on for debugging purposes when the 106 * flag field is exported via the traceport interface 107 */ 108 109 /* prefer goal again. length */ 110 #define EXT4_MB_HINT_MERGE 0x0001 111 /* blocks already reserved */ 112 #define EXT4_MB_HINT_RESERVED 0x0002 113 /* metadata is being allocated */ 114 #define EXT4_MB_HINT_METADATA 0x0004 115 /* first blocks in the file */ 116 #define EXT4_MB_HINT_FIRST 0x0008 117 /* search for the best chunk */ 118 #define EXT4_MB_HINT_BEST 0x0010 119 /* data is being allocated */ 120 #define EXT4_MB_HINT_DATA 0x0020 121 /* don't preallocate (for tails) */ 122 #define EXT4_MB_HINT_NOPREALLOC 0x0040 123 /* allocate for locality group */ 124 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 125 /* allocate goal blocks or none */ 126 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 127 /* goal is meaningful */ 128 #define EXT4_MB_HINT_TRY_GOAL 0x0200 129 /* blocks already pre-reserved by delayed allocation */ 130 #define EXT4_MB_DELALLOC_RESERVED 0x0400 131 /* We are doing stream allocation */ 132 #define EXT4_MB_STREAM_ALLOC 0x0800 133 /* Use reserved root blocks if needed */ 134 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 135 /* Use blocks from reserved pool */ 136 #define EXT4_MB_USE_RESERVED 0x2000 137 138 struct ext4_allocation_request { 139 /* target inode for block we're allocating */ 140 struct inode *inode; 141 /* how many blocks we want to allocate */ 142 unsigned int len; 143 /* logical block in target inode */ 144 ext4_lblk_t logical; 145 /* the closest logical allocated block to the left */ 146 ext4_lblk_t lleft; 147 /* the closest logical allocated block to the right */ 148 ext4_lblk_t lright; 149 /* phys. target (a hint) */ 150 ext4_fsblk_t goal; 151 /* phys. block for the closest logical allocated block to the left */ 152 ext4_fsblk_t pleft; 153 /* phys. block for the closest logical allocated block to the right */ 154 ext4_fsblk_t pright; 155 /* flags. see above EXT4_MB_HINT_* */ 156 unsigned int flags; 157 }; 158 159 /* 160 * Logical to physical block mapping, used by ext4_map_blocks() 161 * 162 * This structure is used to pass requests into ext4_map_blocks() as 163 * well as to store the information returned by ext4_map_blocks(). It 164 * takes less room on the stack than a struct buffer_head. 165 */ 166 #define EXT4_MAP_NEW (1 << BH_New) 167 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 168 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 169 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 170 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 171 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 172 173 struct ext4_map_blocks { 174 ext4_fsblk_t m_pblk; 175 ext4_lblk_t m_lblk; 176 unsigned int m_len; 177 unsigned int m_flags; 178 }; 179 180 /* 181 * Flags for ext4_io_end->flags 182 */ 183 #define EXT4_IO_END_UNWRITTEN 0x0001 184 185 /* 186 * For converting unwritten extents on a work queue. 'handle' is used for 187 * buffered writeback. 188 */ 189 typedef struct ext4_io_end { 190 struct list_head list; /* per-file finished IO list */ 191 handle_t *handle; /* handle reserved for extent 192 * conversion */ 193 struct inode *inode; /* file being written to */ 194 struct bio *bio; /* Linked list of completed 195 * bios covering the extent */ 196 unsigned int flag; /* unwritten or not */ 197 atomic_t count; /* reference counter */ 198 loff_t offset; /* offset in the file */ 199 ssize_t size; /* size of the extent */ 200 } ext4_io_end_t; 201 202 struct ext4_io_submit { 203 struct writeback_control *io_wbc; 204 struct bio *io_bio; 205 ext4_io_end_t *io_end; 206 sector_t io_next_block; 207 }; 208 209 /* 210 * Special inodes numbers 211 */ 212 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 213 #define EXT4_ROOT_INO 2 /* Root inode */ 214 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 215 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 216 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 217 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 218 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 219 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 220 221 /* First non-reserved inode for old ext4 filesystems */ 222 #define EXT4_GOOD_OLD_FIRST_INO 11 223 224 /* 225 * Maximal count of links to a file 226 */ 227 #define EXT4_LINK_MAX 65000 228 229 /* 230 * Macro-instructions used to manage several block sizes 231 */ 232 #define EXT4_MIN_BLOCK_SIZE 1024 233 #define EXT4_MAX_BLOCK_SIZE 65536 234 #define EXT4_MIN_BLOCK_LOG_SIZE 10 235 #define EXT4_MAX_BLOCK_LOG_SIZE 16 236 #ifdef __KERNEL__ 237 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 238 #else 239 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 240 #endif 241 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 242 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 243 EXT4_SB(s)->s_cluster_bits) 244 #ifdef __KERNEL__ 245 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 246 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 247 #else 248 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 249 #endif 250 #ifdef __KERNEL__ 251 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 252 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 253 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 254 #else 255 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 256 EXT4_GOOD_OLD_INODE_SIZE : \ 257 (s)->s_inode_size) 258 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 259 EXT4_GOOD_OLD_FIRST_INO : \ 260 (s)->s_first_ino) 261 #endif 262 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 263 264 /* Translate a block number to a cluster number */ 265 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 266 /* Translate a cluster number to a block number */ 267 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 268 /* Translate # of blks to # of clusters */ 269 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 270 (sbi)->s_cluster_bits) 271 /* Mask out the low bits to get the starting block of the cluster */ 272 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 273 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 274 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 275 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 276 /* Get the cluster offset */ 277 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 278 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 279 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 280 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 281 282 /* 283 * Structure of a blocks group descriptor 284 */ 285 struct ext4_group_desc 286 { 287 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 288 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 289 __le32 bg_inode_table_lo; /* Inodes table block */ 290 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 291 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 292 __le16 bg_used_dirs_count_lo; /* Directories count */ 293 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 294 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 295 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 296 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 297 __le16 bg_itable_unused_lo; /* Unused inodes count */ 298 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 299 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 300 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 301 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 302 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 303 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 304 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 305 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 306 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 307 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 308 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 309 __u32 bg_reserved; 310 }; 311 312 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 313 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 314 sizeof(__le16)) 315 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 316 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 317 sizeof(__le16)) 318 319 /* 320 * Structure of a flex block group info 321 */ 322 323 struct flex_groups { 324 atomic64_t free_clusters; 325 atomic_t free_inodes; 326 atomic_t used_dirs; 327 }; 328 329 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 330 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 331 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 332 333 /* 334 * Macro-instructions used to manage group descriptors 335 */ 336 #define EXT4_MIN_DESC_SIZE 32 337 #define EXT4_MIN_DESC_SIZE_64BIT 64 338 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 339 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 340 #ifdef __KERNEL__ 341 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 342 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 343 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 344 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 345 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 346 #else 347 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 348 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 349 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 350 #endif 351 352 /* 353 * Constants relative to the data blocks 354 */ 355 #define EXT4_NDIR_BLOCKS 12 356 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 357 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 358 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 359 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 360 361 /* 362 * Inode flags 363 */ 364 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 365 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 366 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 367 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 368 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 369 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 370 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 371 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 372 /* Reserved for compression usage... */ 373 #define EXT4_DIRTY_FL 0x00000100 374 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 375 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 376 /* nb: was previously EXT2_ECOMPR_FL */ 377 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 378 /* End compression flags --- maybe not all used */ 379 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 380 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 381 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 382 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 383 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 384 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 385 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 386 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 387 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 388 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 389 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 390 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 391 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 392 393 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 394 #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */ 395 396 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 397 EXT4_IMMUTABLE_FL | \ 398 EXT4_APPEND_FL | \ 399 EXT4_NODUMP_FL | \ 400 EXT4_NOATIME_FL | \ 401 EXT4_PROJINHERIT_FL) 402 403 /* Flags that should be inherited by new inodes from their parent. */ 404 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 405 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 406 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 407 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 408 EXT4_PROJINHERIT_FL) 409 410 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 411 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 412 413 /* Flags that are appropriate for non-directories/regular files. */ 414 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 415 416 /* Mask out flags that are inappropriate for the given type of inode. */ 417 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 418 { 419 if (S_ISDIR(mode)) 420 return flags; 421 else if (S_ISREG(mode)) 422 return flags & EXT4_REG_FLMASK; 423 else 424 return flags & EXT4_OTHER_FLMASK; 425 } 426 427 /* 428 * Inode flags used for atomic set/get 429 */ 430 enum { 431 EXT4_INODE_SECRM = 0, /* Secure deletion */ 432 EXT4_INODE_UNRM = 1, /* Undelete */ 433 EXT4_INODE_COMPR = 2, /* Compress file */ 434 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 435 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 436 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 437 EXT4_INODE_NODUMP = 6, /* do not dump file */ 438 EXT4_INODE_NOATIME = 7, /* do not update atime */ 439 /* Reserved for compression usage... */ 440 EXT4_INODE_DIRTY = 8, 441 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 442 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 443 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 444 /* End compression flags --- maybe not all used */ 445 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 446 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 447 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 448 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 449 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 450 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 451 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 452 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 453 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 454 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 455 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 456 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 457 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 458 }; 459 460 /* 461 * Since it's pretty easy to mix up bit numbers and hex values, we use a 462 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 463 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 464 * any extra space in the compiled kernel image, otherwise, the build will fail. 465 * It's important that these values are the same, since we are using 466 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 467 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 468 * values found in ext2, ext3 and ext4 filesystems, and of course the values 469 * defined in e2fsprogs. 470 * 471 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 472 */ 473 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 474 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 475 476 static inline void ext4_check_flag_values(void) 477 { 478 CHECK_FLAG_VALUE(SECRM); 479 CHECK_FLAG_VALUE(UNRM); 480 CHECK_FLAG_VALUE(COMPR); 481 CHECK_FLAG_VALUE(SYNC); 482 CHECK_FLAG_VALUE(IMMUTABLE); 483 CHECK_FLAG_VALUE(APPEND); 484 CHECK_FLAG_VALUE(NODUMP); 485 CHECK_FLAG_VALUE(NOATIME); 486 CHECK_FLAG_VALUE(DIRTY); 487 CHECK_FLAG_VALUE(COMPRBLK); 488 CHECK_FLAG_VALUE(NOCOMPR); 489 CHECK_FLAG_VALUE(ENCRYPT); 490 CHECK_FLAG_VALUE(INDEX); 491 CHECK_FLAG_VALUE(IMAGIC); 492 CHECK_FLAG_VALUE(JOURNAL_DATA); 493 CHECK_FLAG_VALUE(NOTAIL); 494 CHECK_FLAG_VALUE(DIRSYNC); 495 CHECK_FLAG_VALUE(TOPDIR); 496 CHECK_FLAG_VALUE(HUGE_FILE); 497 CHECK_FLAG_VALUE(EXTENTS); 498 CHECK_FLAG_VALUE(EA_INODE); 499 CHECK_FLAG_VALUE(EOFBLOCKS); 500 CHECK_FLAG_VALUE(INLINE_DATA); 501 CHECK_FLAG_VALUE(PROJINHERIT); 502 CHECK_FLAG_VALUE(RESERVED); 503 } 504 505 /* Used to pass group descriptor data when online resize is done */ 506 struct ext4_new_group_input { 507 __u32 group; /* Group number for this data */ 508 __u64 block_bitmap; /* Absolute block number of block bitmap */ 509 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 510 __u64 inode_table; /* Absolute block number of inode table start */ 511 __u32 blocks_count; /* Total number of blocks in this group */ 512 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 513 __u16 unused; 514 }; 515 516 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 517 struct compat_ext4_new_group_input { 518 u32 group; 519 compat_u64 block_bitmap; 520 compat_u64 inode_bitmap; 521 compat_u64 inode_table; 522 u32 blocks_count; 523 u16 reserved_blocks; 524 u16 unused; 525 }; 526 #endif 527 528 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 529 struct ext4_new_group_data { 530 __u32 group; 531 __u64 block_bitmap; 532 __u64 inode_bitmap; 533 __u64 inode_table; 534 __u32 blocks_count; 535 __u16 reserved_blocks; 536 __u16 unused; 537 __u32 free_blocks_count; 538 }; 539 540 /* Indexes used to index group tables in ext4_new_group_data */ 541 enum { 542 BLOCK_BITMAP = 0, /* block bitmap */ 543 INODE_BITMAP, /* inode bitmap */ 544 INODE_TABLE, /* inode tables */ 545 GROUP_TABLE_COUNT, 546 }; 547 548 /* 549 * Flags used by ext4_map_blocks() 550 */ 551 /* Allocate any needed blocks and/or convert an unwritten 552 extent to be an initialized ext4 */ 553 #define EXT4_GET_BLOCKS_CREATE 0x0001 554 /* Request the creation of an unwritten extent */ 555 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 556 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 557 EXT4_GET_BLOCKS_CREATE) 558 /* Caller is from the delayed allocation writeout path 559 * finally doing the actual allocation of delayed blocks */ 560 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 561 /* caller is from the direct IO path, request to creation of an 562 unwritten extents if not allocated, split the unwritten 563 extent if blocks has been preallocated already*/ 564 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 565 #define EXT4_GET_BLOCKS_CONVERT 0x0010 566 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 567 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 568 /* Convert extent to initialized after IO complete */ 569 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 570 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 571 /* Eventual metadata allocation (due to growing extent tree) 572 * should not fail, so try to use reserved blocks for that.*/ 573 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 574 /* Don't normalize allocation size (used for fallocate) */ 575 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 576 /* Request will not result in inode size update (user for fallocate) */ 577 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 578 /* Convert written extents to unwritten */ 579 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 580 /* Write zeros to newly created written extents */ 581 #define EXT4_GET_BLOCKS_ZERO 0x0200 582 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 583 EXT4_GET_BLOCKS_ZERO) 584 585 /* 586 * The bit position of these flags must not overlap with any of the 587 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 588 * read_extent_tree_block(), ext4_split_extent_at(), 589 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 590 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 591 * caching the extents when reading from the extent tree while a 592 * truncate or punch hole operation is in progress. 593 */ 594 #define EXT4_EX_NOCACHE 0x40000000 595 #define EXT4_EX_FORCE_CACHE 0x20000000 596 597 /* 598 * Flags used by ext4_free_blocks 599 */ 600 #define EXT4_FREE_BLOCKS_METADATA 0x0001 601 #define EXT4_FREE_BLOCKS_FORGET 0x0002 602 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 603 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 604 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 605 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 606 607 /* Encryption algorithms */ 608 #define EXT4_ENCRYPTION_MODE_INVALID 0 609 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 610 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 611 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 612 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 613 614 #include "ext4_crypto.h" 615 616 /* 617 * ioctl commands 618 */ 619 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 620 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 621 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 622 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 623 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 624 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 625 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 626 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 627 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 628 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 629 #define EXT4_IOC_MIGRATE _IO('f', 9) 630 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 631 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 632 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 633 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 634 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 635 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 636 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 637 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 638 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 639 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 640 641 #ifndef FS_IOC_FSGETXATTR 642 /* Until the uapi changes get merged for project quota... */ 643 644 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 645 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 646 647 /* 648 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 649 */ 650 struct fsxattr { 651 __u32 fsx_xflags; /* xflags field value (get/set) */ 652 __u32 fsx_extsize; /* extsize field value (get/set)*/ 653 __u32 fsx_nextents; /* nextents field value (get) */ 654 __u32 fsx_projid; /* project identifier (get/set) */ 655 unsigned char fsx_pad[12]; 656 }; 657 658 /* 659 * Flags for the fsx_xflags field 660 */ 661 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 662 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 663 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 664 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 665 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 666 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 667 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 668 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 669 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 670 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 671 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 672 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 673 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 674 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 675 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 676 #endif /* !defined(FS_IOC_FSGETXATTR) */ 677 678 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 679 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 680 681 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 682 /* 683 * ioctl commands in 32 bit emulation 684 */ 685 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 686 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 687 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 688 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 689 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 690 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 691 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 692 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 693 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 694 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 695 #endif 696 697 /* Max physical block we can address w/o extents */ 698 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 699 700 /* 701 * Structure of an inode on the disk 702 */ 703 struct ext4_inode { 704 __le16 i_mode; /* File mode */ 705 __le16 i_uid; /* Low 16 bits of Owner Uid */ 706 __le32 i_size_lo; /* Size in bytes */ 707 __le32 i_atime; /* Access time */ 708 __le32 i_ctime; /* Inode Change time */ 709 __le32 i_mtime; /* Modification time */ 710 __le32 i_dtime; /* Deletion Time */ 711 __le16 i_gid; /* Low 16 bits of Group Id */ 712 __le16 i_links_count; /* Links count */ 713 __le32 i_blocks_lo; /* Blocks count */ 714 __le32 i_flags; /* File flags */ 715 union { 716 struct { 717 __le32 l_i_version; 718 } linux1; 719 struct { 720 __u32 h_i_translator; 721 } hurd1; 722 struct { 723 __u32 m_i_reserved1; 724 } masix1; 725 } osd1; /* OS dependent 1 */ 726 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 727 __le32 i_generation; /* File version (for NFS) */ 728 __le32 i_file_acl_lo; /* File ACL */ 729 __le32 i_size_high; 730 __le32 i_obso_faddr; /* Obsoleted fragment address */ 731 union { 732 struct { 733 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 734 __le16 l_i_file_acl_high; 735 __le16 l_i_uid_high; /* these 2 fields */ 736 __le16 l_i_gid_high; /* were reserved2[0] */ 737 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 738 __le16 l_i_reserved; 739 } linux2; 740 struct { 741 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 742 __u16 h_i_mode_high; 743 __u16 h_i_uid_high; 744 __u16 h_i_gid_high; 745 __u32 h_i_author; 746 } hurd2; 747 struct { 748 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 749 __le16 m_i_file_acl_high; 750 __u32 m_i_reserved2[2]; 751 } masix2; 752 } osd2; /* OS dependent 2 */ 753 __le16 i_extra_isize; 754 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 755 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 756 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 757 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 758 __le32 i_crtime; /* File Creation time */ 759 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 760 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 761 __le32 i_projid; /* Project ID */ 762 }; 763 764 struct move_extent { 765 __u32 reserved; /* should be zero */ 766 __u32 donor_fd; /* donor file descriptor */ 767 __u64 orig_start; /* logical start offset in block for orig */ 768 __u64 donor_start; /* logical start offset in block for donor */ 769 __u64 len; /* block length to be moved */ 770 __u64 moved_len; /* moved block length */ 771 }; 772 773 #define EXT4_EPOCH_BITS 2 774 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 775 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 776 777 /* 778 * Extended fields will fit into an inode if the filesystem was formatted 779 * with large inodes (-I 256 or larger) and there are not currently any EAs 780 * consuming all of the available space. For new inodes we always reserve 781 * enough space for the kernel's known extended fields, but for inodes 782 * created with an old kernel this might not have been the case. None of 783 * the extended inode fields is critical for correct filesystem operation. 784 * This macro checks if a certain field fits in the inode. Note that 785 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 786 */ 787 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 788 ((offsetof(typeof(*ext4_inode), field) + \ 789 sizeof((ext4_inode)->field)) \ 790 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 791 (einode)->i_extra_isize)) \ 792 793 /* 794 * We use an encoding that preserves the times for extra epoch "00": 795 * 796 * extra msb of adjust for signed 797 * epoch 32-bit 32-bit tv_sec to 798 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 799 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 800 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 801 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 802 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 803 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 804 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 805 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 806 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 807 * 808 * Note that previous versions of the kernel on 64-bit systems would 809 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 810 * 1970. e2fsck will correct this, assuming that it is run on the 811 * affected filesystem before 2242. 812 */ 813 814 static inline __le32 ext4_encode_extra_time(struct timespec *time) 815 { 816 u32 extra = sizeof(time->tv_sec) > 4 ? 817 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 818 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 819 } 820 821 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 822 { 823 if (unlikely(sizeof(time->tv_sec) > 4 && 824 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 825 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 826 /* Handle legacy encoding of pre-1970 dates with epoch 827 * bits 1,1. We assume that by kernel version 4.20, 828 * everyone will have run fsck over the affected 829 * filesystems to correct the problem. (This 830 * backwards compatibility may be removed before this 831 * time, at the discretion of the ext4 developers.) 832 */ 833 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 834 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 835 extra_bits = 0; 836 time->tv_sec += extra_bits << 32; 837 #else 838 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 839 #endif 840 } 841 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 842 } 843 844 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 845 do { \ 846 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 847 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 848 (raw_inode)->xtime ## _extra = \ 849 ext4_encode_extra_time(&(inode)->xtime); \ 850 } while (0) 851 852 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 853 do { \ 854 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 855 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 856 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 857 (raw_inode)->xtime ## _extra = \ 858 ext4_encode_extra_time(&(einode)->xtime); \ 859 } while (0) 860 861 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 862 do { \ 863 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 864 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 865 ext4_decode_extra_time(&(inode)->xtime, \ 866 raw_inode->xtime ## _extra); \ 867 else \ 868 (inode)->xtime.tv_nsec = 0; \ 869 } while (0) 870 871 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 872 do { \ 873 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 874 (einode)->xtime.tv_sec = \ 875 (signed)le32_to_cpu((raw_inode)->xtime); \ 876 else \ 877 (einode)->xtime.tv_sec = 0; \ 878 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 879 ext4_decode_extra_time(&(einode)->xtime, \ 880 raw_inode->xtime ## _extra); \ 881 else \ 882 (einode)->xtime.tv_nsec = 0; \ 883 } while (0) 884 885 #define i_disk_version osd1.linux1.l_i_version 886 887 #if defined(__KERNEL__) || defined(__linux__) 888 #define i_reserved1 osd1.linux1.l_i_reserved1 889 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 890 #define i_blocks_high osd2.linux2.l_i_blocks_high 891 #define i_uid_low i_uid 892 #define i_gid_low i_gid 893 #define i_uid_high osd2.linux2.l_i_uid_high 894 #define i_gid_high osd2.linux2.l_i_gid_high 895 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 896 897 #elif defined(__GNU__) 898 899 #define i_translator osd1.hurd1.h_i_translator 900 #define i_uid_high osd2.hurd2.h_i_uid_high 901 #define i_gid_high osd2.hurd2.h_i_gid_high 902 #define i_author osd2.hurd2.h_i_author 903 904 #elif defined(__masix__) 905 906 #define i_reserved1 osd1.masix1.m_i_reserved1 907 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 908 #define i_reserved2 osd2.masix2.m_i_reserved2 909 910 #endif /* defined(__KERNEL__) || defined(__linux__) */ 911 912 #include "extents_status.h" 913 914 /* 915 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 916 * 917 * These are needed to avoid lockdep false positives when we need to 918 * allocate blocks to the quota inode during ext4_map_blocks(), while 919 * holding i_data_sem for a normal (non-quota) inode. Since we don't 920 * do quota tracking for the quota inode, this avoids deadlock (as 921 * well as infinite recursion, since it isn't turtles all the way 922 * down...) 923 * 924 * I_DATA_SEM_NORMAL - Used for most inodes 925 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 926 * where the second inode has larger inode number 927 * than the first 928 * I_DATA_SEM_QUOTA - Used for quota inodes only 929 */ 930 enum { 931 I_DATA_SEM_NORMAL = 0, 932 I_DATA_SEM_OTHER, 933 I_DATA_SEM_QUOTA, 934 }; 935 936 937 /* 938 * fourth extended file system inode data in memory 939 */ 940 struct ext4_inode_info { 941 __le32 i_data[15]; /* unconverted */ 942 __u32 i_dtime; 943 ext4_fsblk_t i_file_acl; 944 945 /* 946 * i_block_group is the number of the block group which contains 947 * this file's inode. Constant across the lifetime of the inode, 948 * it is ued for making block allocation decisions - we try to 949 * place a file's data blocks near its inode block, and new inodes 950 * near to their parent directory's inode. 951 */ 952 ext4_group_t i_block_group; 953 ext4_lblk_t i_dir_start_lookup; 954 #if (BITS_PER_LONG < 64) 955 unsigned long i_state_flags; /* Dynamic state flags */ 956 #endif 957 unsigned long i_flags; 958 959 /* 960 * Extended attributes can be read independently of the main file 961 * data. Taking i_mutex even when reading would cause contention 962 * between readers of EAs and writers of regular file data, so 963 * instead we synchronize on xattr_sem when reading or changing 964 * EAs. 965 */ 966 struct rw_semaphore xattr_sem; 967 968 struct list_head i_orphan; /* unlinked but open inodes */ 969 970 /* 971 * i_disksize keeps track of what the inode size is ON DISK, not 972 * in memory. During truncate, i_size is set to the new size by 973 * the VFS prior to calling ext4_truncate(), but the filesystem won't 974 * set i_disksize to 0 until the truncate is actually under way. 975 * 976 * The intent is that i_disksize always represents the blocks which 977 * are used by this file. This allows recovery to restart truncate 978 * on orphans if we crash during truncate. We actually write i_disksize 979 * into the on-disk inode when writing inodes out, instead of i_size. 980 * 981 * The only time when i_disksize and i_size may be different is when 982 * a truncate is in progress. The only things which change i_disksize 983 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 984 */ 985 loff_t i_disksize; 986 987 /* 988 * i_data_sem is for serialising ext4_truncate() against 989 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 990 * data tree are chopped off during truncate. We can't do that in 991 * ext4 because whenever we perform intermediate commits during 992 * truncate, the inode and all the metadata blocks *must* be in a 993 * consistent state which allows truncation of the orphans to restart 994 * during recovery. Hence we must fix the get_block-vs-truncate race 995 * by other means, so we have i_data_sem. 996 */ 997 struct rw_semaphore i_data_sem; 998 /* 999 * i_mmap_sem is for serializing page faults with truncate / punch hole 1000 * operations. We have to make sure that new page cannot be faulted in 1001 * a section of the inode that is being punched. We cannot easily use 1002 * i_data_sem for this since we need protection for the whole punch 1003 * operation and i_data_sem ranks below transaction start so we have 1004 * to occasionally drop it. 1005 */ 1006 struct rw_semaphore i_mmap_sem; 1007 struct inode vfs_inode; 1008 struct jbd2_inode *jinode; 1009 1010 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1011 1012 /* 1013 * File creation time. Its function is same as that of 1014 * struct timespec i_{a,c,m}time in the generic inode. 1015 */ 1016 struct timespec i_crtime; 1017 1018 /* mballoc */ 1019 struct list_head i_prealloc_list; 1020 spinlock_t i_prealloc_lock; 1021 1022 /* extents status tree */ 1023 struct ext4_es_tree i_es_tree; 1024 rwlock_t i_es_lock; 1025 struct list_head i_es_list; 1026 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1027 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1028 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1029 extents to shrink. Protected by 1030 i_es_lock */ 1031 1032 /* ialloc */ 1033 ext4_group_t i_last_alloc_group; 1034 1035 /* allocation reservation info for delalloc */ 1036 /* In case of bigalloc, these refer to clusters rather than blocks */ 1037 unsigned int i_reserved_data_blocks; 1038 unsigned int i_reserved_meta_blocks; 1039 unsigned int i_allocated_meta_blocks; 1040 ext4_lblk_t i_da_metadata_calc_last_lblock; 1041 int i_da_metadata_calc_len; 1042 1043 /* on-disk additional length */ 1044 __u16 i_extra_isize; 1045 1046 /* Indicate the inline data space. */ 1047 u16 i_inline_off; 1048 u16 i_inline_size; 1049 1050 #ifdef CONFIG_QUOTA 1051 /* quota space reservation, managed internally by quota code */ 1052 qsize_t i_reserved_quota; 1053 #endif 1054 1055 /* Lock protecting lists below */ 1056 spinlock_t i_completed_io_lock; 1057 /* 1058 * Completed IOs that need unwritten extents handling and have 1059 * transaction reserved 1060 */ 1061 struct list_head i_rsv_conversion_list; 1062 struct work_struct i_rsv_conversion_work; 1063 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1064 1065 spinlock_t i_block_reservation_lock; 1066 1067 /* 1068 * Transactions that contain inode's metadata needed to complete 1069 * fsync and fdatasync, respectively. 1070 */ 1071 tid_t i_sync_tid; 1072 tid_t i_datasync_tid; 1073 1074 #ifdef CONFIG_QUOTA 1075 struct dquot *i_dquot[MAXQUOTAS]; 1076 #endif 1077 1078 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1079 __u32 i_csum_seed; 1080 1081 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1082 /* Encryption params */ 1083 struct ext4_crypt_info *i_crypt_info; 1084 #endif 1085 kprojid_t i_projid; 1086 }; 1087 1088 /* 1089 * File system states 1090 */ 1091 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1092 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1093 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1094 1095 /* 1096 * Misc. filesystem flags 1097 */ 1098 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1099 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1100 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1101 1102 /* 1103 * Mount flags set via mount options or defaults 1104 */ 1105 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1106 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1107 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1108 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1109 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1110 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1111 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1112 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1113 #ifdef CONFIG_FS_DAX 1114 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1115 #else 1116 #define EXT4_MOUNT_DAX 0 1117 #endif 1118 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1119 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1120 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1121 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1122 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1123 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1124 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1125 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1126 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1127 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1128 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1129 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1130 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1131 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1132 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1133 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1134 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1135 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1136 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1137 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1138 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1139 1140 /* 1141 * Mount flags set either automatically (could not be set by mount option) 1142 * based on per file system feature or property or in special cases such as 1143 * distinguishing between explicit mount option definition and default. 1144 */ 1145 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1146 specified delalloc */ 1147 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1148 size of blocksize * 8 1149 blocks */ 1150 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1151 file systems */ 1152 1153 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1154 specified journal checksum */ 1155 1156 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1157 ~EXT4_MOUNT_##opt 1158 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1159 EXT4_MOUNT_##opt 1160 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1161 EXT4_MOUNT_##opt) 1162 1163 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1164 ~EXT4_MOUNT2_##opt 1165 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1166 EXT4_MOUNT2_##opt 1167 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1168 EXT4_MOUNT2_##opt) 1169 1170 #define ext4_test_and_set_bit __test_and_set_bit_le 1171 #define ext4_set_bit __set_bit_le 1172 #define ext4_set_bit_atomic ext2_set_bit_atomic 1173 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1174 #define ext4_clear_bit __clear_bit_le 1175 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1176 #define ext4_test_bit test_bit_le 1177 #define ext4_find_next_zero_bit find_next_zero_bit_le 1178 #define ext4_find_next_bit find_next_bit_le 1179 1180 extern void ext4_set_bits(void *bm, int cur, int len); 1181 1182 /* 1183 * Maximal mount counts between two filesystem checks 1184 */ 1185 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1186 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1187 1188 /* 1189 * Behaviour when detecting errors 1190 */ 1191 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1192 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1193 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1194 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1195 1196 /* Metadata checksum algorithm codes */ 1197 #define EXT4_CRC32C_CHKSUM 1 1198 1199 /* 1200 * Structure of the super block 1201 */ 1202 struct ext4_super_block { 1203 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1204 __le32 s_blocks_count_lo; /* Blocks count */ 1205 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1206 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1207 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1208 __le32 s_first_data_block; /* First Data Block */ 1209 __le32 s_log_block_size; /* Block size */ 1210 __le32 s_log_cluster_size; /* Allocation cluster size */ 1211 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1212 __le32 s_clusters_per_group; /* # Clusters per group */ 1213 __le32 s_inodes_per_group; /* # Inodes per group */ 1214 __le32 s_mtime; /* Mount time */ 1215 /*30*/ __le32 s_wtime; /* Write time */ 1216 __le16 s_mnt_count; /* Mount count */ 1217 __le16 s_max_mnt_count; /* Maximal mount count */ 1218 __le16 s_magic; /* Magic signature */ 1219 __le16 s_state; /* File system state */ 1220 __le16 s_errors; /* Behaviour when detecting errors */ 1221 __le16 s_minor_rev_level; /* minor revision level */ 1222 /*40*/ __le32 s_lastcheck; /* time of last check */ 1223 __le32 s_checkinterval; /* max. time between checks */ 1224 __le32 s_creator_os; /* OS */ 1225 __le32 s_rev_level; /* Revision level */ 1226 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1227 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1228 /* 1229 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1230 * 1231 * Note: the difference between the compatible feature set and 1232 * the incompatible feature set is that if there is a bit set 1233 * in the incompatible feature set that the kernel doesn't 1234 * know about, it should refuse to mount the filesystem. 1235 * 1236 * e2fsck's requirements are more strict; if it doesn't know 1237 * about a feature in either the compatible or incompatible 1238 * feature set, it must abort and not try to meddle with 1239 * things it doesn't understand... 1240 */ 1241 __le32 s_first_ino; /* First non-reserved inode */ 1242 __le16 s_inode_size; /* size of inode structure */ 1243 __le16 s_block_group_nr; /* block group # of this superblock */ 1244 __le32 s_feature_compat; /* compatible feature set */ 1245 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1246 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1247 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1248 /*78*/ char s_volume_name[16]; /* volume name */ 1249 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1250 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1251 /* 1252 * Performance hints. Directory preallocation should only 1253 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1254 */ 1255 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1256 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1257 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1258 /* 1259 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1260 */ 1261 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1262 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1263 __le32 s_journal_dev; /* device number of journal file */ 1264 __le32 s_last_orphan; /* start of list of inodes to delete */ 1265 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1266 __u8 s_def_hash_version; /* Default hash version to use */ 1267 __u8 s_jnl_backup_type; 1268 __le16 s_desc_size; /* size of group descriptor */ 1269 /*100*/ __le32 s_default_mount_opts; 1270 __le32 s_first_meta_bg; /* First metablock block group */ 1271 __le32 s_mkfs_time; /* When the filesystem was created */ 1272 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1273 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1274 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1275 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1276 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1277 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1278 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1279 __le32 s_flags; /* Miscellaneous flags */ 1280 __le16 s_raid_stride; /* RAID stride */ 1281 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1282 __le64 s_mmp_block; /* Block for multi-mount protection */ 1283 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1284 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1285 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1286 __u8 s_encryption_level; /* versioning level for encryption */ 1287 __u8 s_reserved_pad; /* Padding to next 32bits */ 1288 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1289 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1290 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1291 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1292 snapshot's future use */ 1293 __le32 s_snapshot_list; /* inode number of the head of the 1294 on-disk snapshot list */ 1295 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1296 __le32 s_error_count; /* number of fs errors */ 1297 __le32 s_first_error_time; /* first time an error happened */ 1298 __le32 s_first_error_ino; /* inode involved in first error */ 1299 __le64 s_first_error_block; /* block involved of first error */ 1300 __u8 s_first_error_func[32]; /* function where the error happened */ 1301 __le32 s_first_error_line; /* line number where error happened */ 1302 __le32 s_last_error_time; /* most recent time of an error */ 1303 __le32 s_last_error_ino; /* inode involved in last error */ 1304 __le32 s_last_error_line; /* line number where error happened */ 1305 __le64 s_last_error_block; /* block involved of last error */ 1306 __u8 s_last_error_func[32]; /* function where the error happened */ 1307 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1308 __u8 s_mount_opts[64]; 1309 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1310 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1311 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1312 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1313 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1314 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1315 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1316 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1317 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1318 __le32 s_reserved[98]; /* Padding to the end of the block */ 1319 __le32 s_checksum; /* crc32c(superblock) */ 1320 }; 1321 1322 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1323 1324 #ifdef __KERNEL__ 1325 1326 /* 1327 * run-time mount flags 1328 */ 1329 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1330 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1331 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1332 1333 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1334 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1335 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1336 #else 1337 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1338 #endif 1339 1340 /* Number of quota types we support */ 1341 #define EXT4_MAXQUOTAS 3 1342 1343 /* 1344 * fourth extended-fs super-block data in memory 1345 */ 1346 struct ext4_sb_info { 1347 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1348 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1349 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1350 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1351 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1352 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1353 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1354 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1355 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1356 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1357 unsigned long s_overhead; /* # of fs overhead clusters */ 1358 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1359 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1360 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1361 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1362 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1363 struct buffer_head **s_group_desc; 1364 unsigned int s_mount_opt; 1365 unsigned int s_mount_opt2; 1366 unsigned int s_mount_flags; 1367 unsigned int s_def_mount_opt; 1368 ext4_fsblk_t s_sb_block; 1369 atomic64_t s_resv_clusters; 1370 kuid_t s_resuid; 1371 kgid_t s_resgid; 1372 unsigned short s_mount_state; 1373 unsigned short s_pad; 1374 int s_addr_per_block_bits; 1375 int s_desc_per_block_bits; 1376 int s_inode_size; 1377 int s_first_ino; 1378 unsigned int s_inode_readahead_blks; 1379 unsigned int s_inode_goal; 1380 spinlock_t s_next_gen_lock; 1381 u32 s_next_generation; 1382 u32 s_hash_seed[4]; 1383 int s_def_hash_version; 1384 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1385 struct percpu_counter s_freeclusters_counter; 1386 struct percpu_counter s_freeinodes_counter; 1387 struct percpu_counter s_dirs_counter; 1388 struct percpu_counter s_dirtyclusters_counter; 1389 struct blockgroup_lock *s_blockgroup_lock; 1390 struct proc_dir_entry *s_proc; 1391 struct kobject s_kobj; 1392 struct completion s_kobj_unregister; 1393 struct super_block *s_sb; 1394 1395 /* Journaling */ 1396 struct journal_s *s_journal; 1397 struct list_head s_orphan; 1398 struct mutex s_orphan_lock; 1399 unsigned long s_resize_flags; /* Flags indicating if there 1400 is a resizer */ 1401 unsigned long s_commit_interval; 1402 u32 s_max_batch_time; 1403 u32 s_min_batch_time; 1404 struct block_device *journal_bdev; 1405 #ifdef CONFIG_QUOTA 1406 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1407 int s_jquota_fmt; /* Format of quota to use */ 1408 #endif 1409 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1410 struct rb_root system_blks; 1411 1412 #ifdef EXTENTS_STATS 1413 /* ext4 extents stats */ 1414 unsigned long s_ext_min; 1415 unsigned long s_ext_max; 1416 unsigned long s_depth_max; 1417 spinlock_t s_ext_stats_lock; 1418 unsigned long s_ext_blocks; 1419 unsigned long s_ext_extents; 1420 #endif 1421 1422 /* for buddy allocator */ 1423 struct ext4_group_info ***s_group_info; 1424 struct inode *s_buddy_cache; 1425 spinlock_t s_md_lock; 1426 unsigned short *s_mb_offsets; 1427 unsigned int *s_mb_maxs; 1428 unsigned int s_group_info_size; 1429 1430 /* tunables */ 1431 unsigned long s_stripe; 1432 unsigned int s_mb_stream_request; 1433 unsigned int s_mb_max_to_scan; 1434 unsigned int s_mb_min_to_scan; 1435 unsigned int s_mb_stats; 1436 unsigned int s_mb_order2_reqs; 1437 unsigned int s_mb_group_prealloc; 1438 unsigned int s_max_dir_size_kb; 1439 /* where last allocation was done - for stream allocation */ 1440 unsigned long s_mb_last_group; 1441 unsigned long s_mb_last_start; 1442 1443 /* stats for buddy allocator */ 1444 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1445 atomic_t s_bal_success; /* we found long enough chunks */ 1446 atomic_t s_bal_allocated; /* in blocks */ 1447 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1448 atomic_t s_bal_goals; /* goal hits */ 1449 atomic_t s_bal_breaks; /* too long searches */ 1450 atomic_t s_bal_2orders; /* 2^order hits */ 1451 spinlock_t s_bal_lock; 1452 unsigned long s_mb_buddies_generated; 1453 unsigned long long s_mb_generation_time; 1454 atomic_t s_mb_lost_chunks; 1455 atomic_t s_mb_preallocated; 1456 atomic_t s_mb_discarded; 1457 atomic_t s_lock_busy; 1458 1459 /* locality groups */ 1460 struct ext4_locality_group __percpu *s_locality_groups; 1461 1462 /* for write statistics */ 1463 unsigned long s_sectors_written_start; 1464 u64 s_kbytes_written; 1465 1466 /* the size of zero-out chunk */ 1467 unsigned int s_extent_max_zeroout_kb; 1468 1469 unsigned int s_log_groups_per_flex; 1470 struct flex_groups *s_flex_groups; 1471 ext4_group_t s_flex_groups_allocated; 1472 1473 /* workqueue for reserved extent conversions (buffered io) */ 1474 struct workqueue_struct *rsv_conversion_wq; 1475 1476 /* timer for periodic error stats printing */ 1477 struct timer_list s_err_report; 1478 1479 /* Lazy inode table initialization info */ 1480 struct ext4_li_request *s_li_request; 1481 /* Wait multiplier for lazy initialization thread */ 1482 unsigned int s_li_wait_mult; 1483 1484 /* Kernel thread for multiple mount protection */ 1485 struct task_struct *s_mmp_tsk; 1486 1487 /* record the last minlen when FITRIM is called. */ 1488 atomic_t s_last_trim_minblks; 1489 1490 /* Reference to checksum algorithm driver via cryptoapi */ 1491 struct crypto_shash *s_chksum_driver; 1492 1493 /* Precomputed FS UUID checksum for seeding other checksums */ 1494 __u32 s_csum_seed; 1495 1496 /* Reclaim extents from extent status tree */ 1497 struct shrinker s_es_shrinker; 1498 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1499 long s_es_nr_inode; 1500 struct ext4_es_stats s_es_stats; 1501 struct mb_cache *s_mb_cache; 1502 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1503 1504 /* Ratelimit ext4 messages. */ 1505 struct ratelimit_state s_err_ratelimit_state; 1506 struct ratelimit_state s_warning_ratelimit_state; 1507 struct ratelimit_state s_msg_ratelimit_state; 1508 }; 1509 1510 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1511 { 1512 return sb->s_fs_info; 1513 } 1514 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1515 { 1516 return container_of(inode, struct ext4_inode_info, vfs_inode); 1517 } 1518 1519 static inline struct timespec ext4_current_time(struct inode *inode) 1520 { 1521 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1522 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1523 } 1524 1525 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1526 { 1527 return ino == EXT4_ROOT_INO || 1528 ino == EXT4_USR_QUOTA_INO || 1529 ino == EXT4_GRP_QUOTA_INO || 1530 ino == EXT4_BOOT_LOADER_INO || 1531 ino == EXT4_JOURNAL_INO || 1532 ino == EXT4_RESIZE_INO || 1533 (ino >= EXT4_FIRST_INO(sb) && 1534 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1535 } 1536 1537 /* 1538 * Inode dynamic state flags 1539 */ 1540 enum { 1541 EXT4_STATE_JDATA, /* journaled data exists */ 1542 EXT4_STATE_NEW, /* inode is newly created */ 1543 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1544 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1545 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1546 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1547 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1548 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1549 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1550 nolocking */ 1551 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1552 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1553 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1554 }; 1555 1556 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1557 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1558 { \ 1559 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1560 } \ 1561 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1562 { \ 1563 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1564 } \ 1565 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1566 { \ 1567 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1568 } 1569 1570 /* Add these declarations here only so that these functions can be 1571 * found by name. Otherwise, they are very hard to locate. */ 1572 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1573 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1574 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1575 EXT4_INODE_BIT_FNS(flag, flags, 0) 1576 1577 /* Add these declarations here only so that these functions can be 1578 * found by name. Otherwise, they are very hard to locate. */ 1579 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1580 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1581 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1582 #if (BITS_PER_LONG < 64) 1583 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1584 1585 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1586 { 1587 (ei)->i_state_flags = 0; 1588 } 1589 #else 1590 EXT4_INODE_BIT_FNS(state, flags, 32) 1591 1592 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1593 { 1594 /* We depend on the fact that callers will set i_flags */ 1595 } 1596 #endif 1597 #else 1598 /* Assume that user mode programs are passing in an ext4fs superblock, not 1599 * a kernel struct super_block. This will allow us to call the feature-test 1600 * macros from user land. */ 1601 #define EXT4_SB(sb) (sb) 1602 #endif 1603 1604 /* 1605 * Returns true if the inode is inode is encrypted 1606 */ 1607 static inline int ext4_encrypted_inode(struct inode *inode) 1608 { 1609 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1610 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1611 #else 1612 return 0; 1613 #endif 1614 } 1615 1616 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1617 1618 /* 1619 * Codes for operating systems 1620 */ 1621 #define EXT4_OS_LINUX 0 1622 #define EXT4_OS_HURD 1 1623 #define EXT4_OS_MASIX 2 1624 #define EXT4_OS_FREEBSD 3 1625 #define EXT4_OS_LITES 4 1626 1627 /* 1628 * Revision levels 1629 */ 1630 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1631 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1632 1633 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1634 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1635 1636 #define EXT4_GOOD_OLD_INODE_SIZE 128 1637 1638 /* 1639 * Feature set definitions 1640 */ 1641 1642 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */ 1643 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1644 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1645 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1646 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1647 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1648 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1649 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1650 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1651 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1652 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1653 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1654 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1655 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1656 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1657 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1658 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1659 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1660 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1661 1662 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1663 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1664 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1665 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1666 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1667 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1668 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1669 1670 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1671 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1672 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1673 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1674 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1675 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1676 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1677 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1678 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1679 /* 1680 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1681 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1682 * all other data structures' checksums. However, the METADATA_CSUM and 1683 * GDT_CSUM bits are mutually exclusive. 1684 */ 1685 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1686 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1687 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1688 1689 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1690 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1691 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1692 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1693 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1694 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1695 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1696 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1697 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1698 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1699 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1700 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1701 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1702 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1703 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1704 1705 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1706 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1707 { \ 1708 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1709 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1710 } \ 1711 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1712 { \ 1713 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1714 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1715 } \ 1716 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1717 { \ 1718 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1719 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1720 } 1721 1722 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1723 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1724 { \ 1725 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1726 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1727 } \ 1728 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1729 { \ 1730 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1731 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1732 } \ 1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1734 { \ 1735 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1736 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1737 } 1738 1739 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1740 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1741 { \ 1742 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1743 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1744 } \ 1745 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1746 { \ 1747 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1748 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1749 } \ 1750 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1751 { \ 1752 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1753 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1754 } 1755 1756 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1757 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1758 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1759 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1760 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1761 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1762 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1763 1764 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1765 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1766 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1767 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1768 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1769 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1770 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1771 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1772 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1773 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1774 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1775 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1776 1777 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1778 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1779 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1780 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1781 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1782 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1783 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1784 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1785 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1786 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1787 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1788 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1789 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1790 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1791 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1792 1793 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1794 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1795 EXT4_FEATURE_INCOMPAT_META_BG) 1796 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1797 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1798 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1799 1800 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1801 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1802 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1803 EXT4_FEATURE_INCOMPAT_META_BG) 1804 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1805 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1806 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1807 1808 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1809 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1810 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1811 EXT4_FEATURE_INCOMPAT_META_BG| \ 1812 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1813 EXT4_FEATURE_INCOMPAT_64BIT| \ 1814 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1815 EXT4_FEATURE_INCOMPAT_MMP | \ 1816 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1817 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1818 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1819 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1820 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1821 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1822 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1823 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1824 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1825 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1826 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1827 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1828 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1829 EXT4_FEATURE_RO_COMPAT_PROJECT) 1830 1831 #define EXTN_FEATURE_FUNCS(ver) \ 1832 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1833 { \ 1834 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1835 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1836 } \ 1837 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1838 { \ 1839 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1840 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1841 } \ 1842 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1843 { \ 1844 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1845 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1846 } 1847 1848 EXTN_FEATURE_FUNCS(2) 1849 EXTN_FEATURE_FUNCS(3) 1850 EXTN_FEATURE_FUNCS(4) 1851 1852 static inline bool ext4_has_compat_features(struct super_block *sb) 1853 { 1854 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1855 } 1856 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1857 { 1858 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1859 } 1860 static inline bool ext4_has_incompat_features(struct super_block *sb) 1861 { 1862 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1863 } 1864 1865 /* 1866 * Default values for user and/or group using reserved blocks 1867 */ 1868 #define EXT4_DEF_RESUID 0 1869 #define EXT4_DEF_RESGID 0 1870 1871 /* 1872 * Default project ID 1873 */ 1874 #define EXT4_DEF_PROJID 0 1875 1876 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1877 1878 /* 1879 * Default mount options 1880 */ 1881 #define EXT4_DEFM_DEBUG 0x0001 1882 #define EXT4_DEFM_BSDGROUPS 0x0002 1883 #define EXT4_DEFM_XATTR_USER 0x0004 1884 #define EXT4_DEFM_ACL 0x0008 1885 #define EXT4_DEFM_UID16 0x0010 1886 #define EXT4_DEFM_JMODE 0x0060 1887 #define EXT4_DEFM_JMODE_DATA 0x0020 1888 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1889 #define EXT4_DEFM_JMODE_WBACK 0x0060 1890 #define EXT4_DEFM_NOBARRIER 0x0100 1891 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1892 #define EXT4_DEFM_DISCARD 0x0400 1893 #define EXT4_DEFM_NODELALLOC 0x0800 1894 1895 /* 1896 * Default journal batch times 1897 */ 1898 #define EXT4_DEF_MIN_BATCH_TIME 0 1899 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1900 1901 /* 1902 * Minimum number of groups in a flexgroup before we separate out 1903 * directories into the first block group of a flexgroup 1904 */ 1905 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1906 1907 /* 1908 * Structure of a directory entry 1909 */ 1910 #define EXT4_NAME_LEN 255 1911 1912 struct ext4_dir_entry { 1913 __le32 inode; /* Inode number */ 1914 __le16 rec_len; /* Directory entry length */ 1915 __le16 name_len; /* Name length */ 1916 char name[EXT4_NAME_LEN]; /* File name */ 1917 }; 1918 1919 /* 1920 * The new version of the directory entry. Since EXT4 structures are 1921 * stored in intel byte order, and the name_len field could never be 1922 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1923 * file_type field. 1924 */ 1925 struct ext4_dir_entry_2 { 1926 __le32 inode; /* Inode number */ 1927 __le16 rec_len; /* Directory entry length */ 1928 __u8 name_len; /* Name length */ 1929 __u8 file_type; 1930 char name[EXT4_NAME_LEN]; /* File name */ 1931 }; 1932 1933 /* 1934 * This is a bogus directory entry at the end of each leaf block that 1935 * records checksums. 1936 */ 1937 struct ext4_dir_entry_tail { 1938 __le32 det_reserved_zero1; /* Pretend to be unused */ 1939 __le16 det_rec_len; /* 12 */ 1940 __u8 det_reserved_zero2; /* Zero name length */ 1941 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1942 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1943 }; 1944 1945 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1946 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1947 ((blocksize) - \ 1948 sizeof(struct ext4_dir_entry_tail)))) 1949 1950 /* 1951 * Ext4 directory file types. Only the low 3 bits are used. The 1952 * other bits are reserved for now. 1953 */ 1954 #define EXT4_FT_UNKNOWN 0 1955 #define EXT4_FT_REG_FILE 1 1956 #define EXT4_FT_DIR 2 1957 #define EXT4_FT_CHRDEV 3 1958 #define EXT4_FT_BLKDEV 4 1959 #define EXT4_FT_FIFO 5 1960 #define EXT4_FT_SOCK 6 1961 #define EXT4_FT_SYMLINK 7 1962 1963 #define EXT4_FT_MAX 8 1964 1965 #define EXT4_FT_DIR_CSUM 0xDE 1966 1967 /* 1968 * EXT4_DIR_PAD defines the directory entries boundaries 1969 * 1970 * NOTE: It must be a multiple of 4 1971 */ 1972 #define EXT4_DIR_PAD 4 1973 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1974 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1975 ~EXT4_DIR_ROUND) 1976 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1977 1978 /* 1979 * If we ever get support for fs block sizes > page_size, we'll need 1980 * to remove the #if statements in the next two functions... 1981 */ 1982 static inline unsigned int 1983 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1984 { 1985 unsigned len = le16_to_cpu(dlen); 1986 1987 #if (PAGE_SIZE >= 65536) 1988 if (len == EXT4_MAX_REC_LEN || len == 0) 1989 return blocksize; 1990 return (len & 65532) | ((len & 3) << 16); 1991 #else 1992 return len; 1993 #endif 1994 } 1995 1996 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1997 { 1998 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1999 BUG(); 2000 #if (PAGE_SIZE >= 65536) 2001 if (len < 65536) 2002 return cpu_to_le16(len); 2003 if (len == blocksize) { 2004 if (blocksize == 65536) 2005 return cpu_to_le16(EXT4_MAX_REC_LEN); 2006 else 2007 return cpu_to_le16(0); 2008 } 2009 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2010 #else 2011 return cpu_to_le16(len); 2012 #endif 2013 } 2014 2015 /* 2016 * Hash Tree Directory indexing 2017 * (c) Daniel Phillips, 2001 2018 */ 2019 2020 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2021 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2022 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 2023 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2024 2025 /* Legal values for the dx_root hash_version field: */ 2026 2027 #define DX_HASH_LEGACY 0 2028 #define DX_HASH_HALF_MD4 1 2029 #define DX_HASH_TEA 2 2030 #define DX_HASH_LEGACY_UNSIGNED 3 2031 #define DX_HASH_HALF_MD4_UNSIGNED 4 2032 #define DX_HASH_TEA_UNSIGNED 5 2033 2034 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2035 const void *address, unsigned int length) 2036 { 2037 struct { 2038 struct shash_desc shash; 2039 char ctx[4]; 2040 } desc; 2041 int err; 2042 2043 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2044 2045 desc.shash.tfm = sbi->s_chksum_driver; 2046 desc.shash.flags = 0; 2047 *(u32 *)desc.ctx = crc; 2048 2049 err = crypto_shash_update(&desc.shash, address, length); 2050 BUG_ON(err); 2051 2052 return *(u32 *)desc.ctx; 2053 } 2054 2055 #ifdef __KERNEL__ 2056 2057 /* hash info structure used by the directory hash */ 2058 struct dx_hash_info 2059 { 2060 u32 hash; 2061 u32 minor_hash; 2062 int hash_version; 2063 u32 *seed; 2064 }; 2065 2066 2067 /* 32 and 64 bit signed EOF for dx directories */ 2068 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2069 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2070 2071 2072 /* 2073 * Control parameters used by ext4_htree_next_block 2074 */ 2075 #define HASH_NB_ALWAYS 1 2076 2077 struct ext4_filename { 2078 const struct qstr *usr_fname; 2079 struct ext4_str disk_name; 2080 struct dx_hash_info hinfo; 2081 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2082 struct ext4_str crypto_buf; 2083 #endif 2084 }; 2085 2086 #define fname_name(p) ((p)->disk_name.name) 2087 #define fname_len(p) ((p)->disk_name.len) 2088 2089 /* 2090 * Describe an inode's exact location on disk and in memory 2091 */ 2092 struct ext4_iloc 2093 { 2094 struct buffer_head *bh; 2095 unsigned long offset; 2096 ext4_group_t block_group; 2097 }; 2098 2099 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2100 { 2101 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2102 } 2103 2104 /* 2105 * This structure is stuffed into the struct file's private_data field 2106 * for directories. It is where we put information so that we can do 2107 * readdir operations in hash tree order. 2108 */ 2109 struct dir_private_info { 2110 struct rb_root root; 2111 struct rb_node *curr_node; 2112 struct fname *extra_fname; 2113 loff_t last_pos; 2114 __u32 curr_hash; 2115 __u32 curr_minor_hash; 2116 __u32 next_hash; 2117 }; 2118 2119 /* calculate the first block number of the group */ 2120 static inline ext4_fsblk_t 2121 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2122 { 2123 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2124 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2125 } 2126 2127 /* 2128 * Special error return code only used by dx_probe() and its callers. 2129 */ 2130 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2131 2132 /* 2133 * Timeout and state flag for lazy initialization inode thread. 2134 */ 2135 #define EXT4_DEF_LI_WAIT_MULT 10 2136 #define EXT4_DEF_LI_MAX_START_DELAY 5 2137 #define EXT4_LAZYINIT_QUIT 0x0001 2138 #define EXT4_LAZYINIT_RUNNING 0x0002 2139 2140 /* 2141 * Lazy inode table initialization info 2142 */ 2143 struct ext4_lazy_init { 2144 unsigned long li_state; 2145 struct list_head li_request_list; 2146 struct mutex li_list_mtx; 2147 }; 2148 2149 struct ext4_li_request { 2150 struct super_block *lr_super; 2151 struct ext4_sb_info *lr_sbi; 2152 ext4_group_t lr_next_group; 2153 struct list_head lr_request; 2154 unsigned long lr_next_sched; 2155 unsigned long lr_timeout; 2156 }; 2157 2158 struct ext4_features { 2159 struct kobject f_kobj; 2160 struct completion f_kobj_unregister; 2161 }; 2162 2163 /* 2164 * This structure will be used for multiple mount protection. It will be 2165 * written into the block number saved in the s_mmp_block field in the 2166 * superblock. Programs that check MMP should assume that if 2167 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2168 * to use the filesystem, regardless of how old the timestamp is. 2169 */ 2170 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2171 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2172 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2173 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2174 2175 struct mmp_struct { 2176 __le32 mmp_magic; /* Magic number for MMP */ 2177 __le32 mmp_seq; /* Sequence no. updated periodically */ 2178 2179 /* 2180 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2181 * purposes and do not affect the correctness of the algorithm 2182 */ 2183 __le64 mmp_time; /* Time last updated */ 2184 char mmp_nodename[64]; /* Node which last updated MMP block */ 2185 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2186 2187 /* 2188 * mmp_check_interval is used to verify if the MMP block has been 2189 * updated on the block device. The value is updated based on the 2190 * maximum time to write the MMP block during an update cycle. 2191 */ 2192 __le16 mmp_check_interval; 2193 2194 __le16 mmp_pad1; 2195 __le32 mmp_pad2[226]; 2196 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2197 }; 2198 2199 /* arguments passed to the mmp thread */ 2200 struct mmpd_data { 2201 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2202 struct super_block *sb; /* super block of the fs */ 2203 }; 2204 2205 /* 2206 * Check interval multiplier 2207 * The MMP block is written every update interval and initially checked every 2208 * update interval x the multiplier (the value is then adapted based on the 2209 * write latency). The reason is that writes can be delayed under load and we 2210 * don't want readers to incorrectly assume that the filesystem is no longer 2211 * in use. 2212 */ 2213 #define EXT4_MMP_CHECK_MULT 2UL 2214 2215 /* 2216 * Minimum interval for MMP checking in seconds. 2217 */ 2218 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2219 2220 /* 2221 * Maximum interval for MMP checking in seconds. 2222 */ 2223 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2224 2225 /* 2226 * Function prototypes 2227 */ 2228 2229 /* 2230 * Ok, these declarations are also in <linux/kernel.h> but none of the 2231 * ext4 source programs needs to include it so they are duplicated here. 2232 */ 2233 # define NORET_TYPE /**/ 2234 # define ATTRIB_NORET __attribute__((noreturn)) 2235 # define NORET_AND noreturn, 2236 2237 /* bitmap.c */ 2238 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2239 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2240 struct ext4_group_desc *gdp, 2241 struct buffer_head *bh, int sz); 2242 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2243 struct ext4_group_desc *gdp, 2244 struct buffer_head *bh, int sz); 2245 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2246 struct ext4_group_desc *gdp, 2247 struct buffer_head *bh); 2248 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2249 struct ext4_group_desc *gdp, 2250 struct buffer_head *bh); 2251 2252 /* balloc.c */ 2253 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2254 ext4_fsblk_t blocknr, 2255 ext4_group_t *blockgrpp, 2256 ext4_grpblk_t *offsetp); 2257 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2258 ext4_fsblk_t block); 2259 2260 extern unsigned int ext4_block_group(struct super_block *sb, 2261 ext4_fsblk_t blocknr); 2262 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2263 ext4_fsblk_t blocknr); 2264 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2265 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2266 ext4_group_t group); 2267 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2268 ext4_fsblk_t goal, 2269 unsigned int flags, 2270 unsigned long *count, 2271 int *errp); 2272 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2273 s64 nclusters, unsigned int flags); 2274 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2275 extern void ext4_check_blocks_bitmap(struct super_block *); 2276 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2277 ext4_group_t block_group, 2278 struct buffer_head ** bh); 2279 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2280 2281 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2282 ext4_group_t block_group); 2283 extern int ext4_wait_block_bitmap(struct super_block *sb, 2284 ext4_group_t block_group, 2285 struct buffer_head *bh); 2286 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2287 ext4_group_t block_group); 2288 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2289 ext4_group_t block_group, 2290 struct ext4_group_desc *gdp); 2291 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2292 2293 /* crypto_policy.c */ 2294 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2295 struct inode *child); 2296 int ext4_inherit_context(struct inode *parent, struct inode *child); 2297 void ext4_to_hex(char *dst, char *src, size_t src_size); 2298 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2299 struct inode *inode); 2300 int ext4_get_policy(struct inode *inode, 2301 struct ext4_encryption_policy *policy); 2302 2303 /* crypto.c */ 2304 extern struct kmem_cache *ext4_crypt_info_cachep; 2305 bool ext4_valid_contents_enc_mode(uint32_t mode); 2306 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2307 extern struct workqueue_struct *ext4_read_workqueue; 2308 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode, 2309 gfp_t gfp_flags); 2310 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2311 void ext4_restore_control_page(struct page *data_page); 2312 struct page *ext4_encrypt(struct inode *inode, 2313 struct page *plaintext_page, 2314 gfp_t gfp_flags); 2315 int ext4_decrypt(struct page *page); 2316 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk, 2317 ext4_fsblk_t pblk, ext4_lblk_t len); 2318 extern const struct dentry_operations ext4_encrypted_d_ops; 2319 2320 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2321 int ext4_init_crypto(void); 2322 void ext4_exit_crypto(void); 2323 static inline int ext4_sb_has_crypto(struct super_block *sb) 2324 { 2325 return ext4_has_feature_encrypt(sb); 2326 } 2327 #else 2328 static inline int ext4_init_crypto(void) { return 0; } 2329 static inline void ext4_exit_crypto(void) { } 2330 static inline int ext4_sb_has_crypto(struct super_block *sb) 2331 { 2332 return 0; 2333 } 2334 #endif 2335 2336 /* crypto_fname.c */ 2337 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2338 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2339 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); 2340 int ext4_fname_crypto_alloc_buffer(struct inode *inode, 2341 u32 ilen, struct ext4_str *crypto_str); 2342 int _ext4_fname_disk_to_usr(struct inode *inode, 2343 struct dx_hash_info *hinfo, 2344 const struct ext4_str *iname, 2345 struct ext4_str *oname); 2346 int ext4_fname_disk_to_usr(struct inode *inode, 2347 struct dx_hash_info *hinfo, 2348 const struct ext4_dir_entry_2 *de, 2349 struct ext4_str *oname); 2350 int ext4_fname_usr_to_disk(struct inode *inode, 2351 const struct qstr *iname, 2352 struct ext4_str *oname); 2353 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2354 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2355 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2356 int lookup, struct ext4_filename *fname); 2357 void ext4_fname_free_filename(struct ext4_filename *fname); 2358 #else 2359 static inline 2360 int ext4_setup_fname_crypto(struct inode *inode) 2361 { 2362 return 0; 2363 } 2364 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2365 static inline int ext4_fname_setup_filename(struct inode *dir, 2366 const struct qstr *iname, 2367 int lookup, struct ext4_filename *fname) 2368 { 2369 fname->usr_fname = iname; 2370 fname->disk_name.name = (unsigned char *) iname->name; 2371 fname->disk_name.len = iname->len; 2372 return 0; 2373 } 2374 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2375 #endif 2376 2377 2378 /* crypto_key.c */ 2379 void ext4_free_crypt_info(struct ext4_crypt_info *ci); 2380 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); 2381 int _ext4_get_encryption_info(struct inode *inode); 2382 2383 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2384 int ext4_has_encryption_key(struct inode *inode); 2385 2386 static inline int ext4_get_encryption_info(struct inode *inode) 2387 { 2388 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; 2389 2390 if (!ci || 2391 (ci->ci_keyring_key && 2392 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | 2393 (1 << KEY_FLAG_REVOKED) | 2394 (1 << KEY_FLAG_DEAD))))) 2395 return _ext4_get_encryption_info(inode); 2396 return 0; 2397 } 2398 2399 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2400 { 2401 return EXT4_I(inode)->i_crypt_info; 2402 } 2403 2404 #else 2405 static inline int ext4_has_encryption_key(struct inode *inode) 2406 { 2407 return 0; 2408 } 2409 static inline int ext4_get_encryption_info(struct inode *inode) 2410 { 2411 return 0; 2412 } 2413 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2414 { 2415 return NULL; 2416 } 2417 #endif 2418 2419 2420 /* dir.c */ 2421 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2422 struct file *, 2423 struct ext4_dir_entry_2 *, 2424 struct buffer_head *, char *, int, 2425 unsigned int); 2426 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2427 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2428 (de), (bh), (buf), (size), (offset))) 2429 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2430 __u32 minor_hash, 2431 struct ext4_dir_entry_2 *dirent, 2432 struct ext4_str *ent_name); 2433 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2434 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2435 struct buffer_head *bh, 2436 void *buf, int buf_size, 2437 struct ext4_filename *fname, 2438 struct ext4_dir_entry_2 **dest_de); 2439 int ext4_insert_dentry(struct inode *dir, 2440 struct inode *inode, 2441 struct ext4_dir_entry_2 *de, 2442 int buf_size, 2443 struct ext4_filename *fname); 2444 static inline void ext4_update_dx_flag(struct inode *inode) 2445 { 2446 if (!ext4_has_feature_dir_index(inode->i_sb)) 2447 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2448 } 2449 static unsigned char ext4_filetype_table[] = { 2450 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2451 }; 2452 2453 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2454 { 2455 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2456 return DT_UNKNOWN; 2457 2458 return ext4_filetype_table[filetype]; 2459 } 2460 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2461 void *buf, int buf_size); 2462 2463 /* fsync.c */ 2464 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2465 2466 /* hash.c */ 2467 extern int ext4fs_dirhash(const char *name, int len, struct 2468 dx_hash_info *hinfo); 2469 2470 /* ialloc.c */ 2471 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2472 const struct qstr *qstr, __u32 goal, 2473 uid_t *owner, int handle_type, 2474 unsigned int line_no, int nblocks); 2475 2476 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2477 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2478 0, 0, 0) 2479 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2480 type, nblocks) \ 2481 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2482 (type), __LINE__, (nblocks)) 2483 2484 2485 extern void ext4_free_inode(handle_t *, struct inode *); 2486 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2487 extern unsigned long ext4_count_free_inodes(struct super_block *); 2488 extern unsigned long ext4_count_dirs(struct super_block *); 2489 extern void ext4_check_inodes_bitmap(struct super_block *); 2490 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2491 extern int ext4_init_inode_table(struct super_block *sb, 2492 ext4_group_t group, int barrier); 2493 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2494 2495 /* mballoc.c */ 2496 extern const struct file_operations ext4_seq_mb_groups_fops; 2497 extern long ext4_mb_stats; 2498 extern long ext4_mb_max_to_scan; 2499 extern int ext4_mb_init(struct super_block *); 2500 extern int ext4_mb_release(struct super_block *); 2501 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2502 struct ext4_allocation_request *, int *); 2503 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2504 extern void ext4_discard_preallocations(struct inode *); 2505 extern int __init ext4_init_mballoc(void); 2506 extern void ext4_exit_mballoc(void); 2507 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2508 struct buffer_head *bh, ext4_fsblk_t block, 2509 unsigned long count, int flags); 2510 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2511 ext4_group_t ngroups); 2512 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2513 ext4_group_t i, struct ext4_group_desc *desc); 2514 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2515 ext4_fsblk_t block, unsigned long count); 2516 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2517 2518 /* inode.c */ 2519 int ext4_inode_is_fast_symlink(struct inode *inode); 2520 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2521 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2522 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2523 struct buffer_head *bh_result, int create); 2524 int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock, 2525 struct buffer_head *bh_result, int create); 2526 int ext4_get_block(struct inode *inode, sector_t iblock, 2527 struct buffer_head *bh_result, int create); 2528 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2529 struct buffer_head *bh_result, int create); 2530 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2531 struct buffer_head *bh, int create); 2532 int ext4_walk_page_buffers(handle_t *handle, 2533 struct buffer_head *head, 2534 unsigned from, 2535 unsigned to, 2536 int *partial, 2537 int (*fn)(handle_t *handle, 2538 struct buffer_head *bh)); 2539 int do_journal_get_write_access(handle_t *handle, 2540 struct buffer_head *bh); 2541 #define FALL_BACK_TO_NONDELALLOC 1 2542 #define CONVERT_INLINE_DATA 2 2543 2544 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2545 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2546 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2547 extern int ext4_setattr(struct dentry *, struct iattr *); 2548 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2549 struct kstat *stat); 2550 extern void ext4_evict_inode(struct inode *); 2551 extern void ext4_clear_inode(struct inode *); 2552 extern int ext4_sync_inode(handle_t *, struct inode *); 2553 extern void ext4_dirty_inode(struct inode *, int); 2554 extern int ext4_change_inode_journal_flag(struct inode *, int); 2555 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2556 extern int ext4_inode_attach_jinode(struct inode *inode); 2557 extern int ext4_can_truncate(struct inode *inode); 2558 extern void ext4_truncate(struct inode *); 2559 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2560 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2561 extern void ext4_set_inode_flags(struct inode *); 2562 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2563 extern int ext4_alloc_da_blocks(struct inode *inode); 2564 extern void ext4_set_aops(struct inode *inode); 2565 extern int ext4_writepage_trans_blocks(struct inode *); 2566 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2567 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2568 loff_t lstart, loff_t lend); 2569 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2570 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 2571 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2572 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2573 extern void ext4_da_update_reserve_space(struct inode *inode, 2574 int used, int quota_claim); 2575 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2576 ext4_fsblk_t pblk, ext4_lblk_t len); 2577 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, 2578 unsigned int map_len, 2579 struct extent_status *result); 2580 2581 /* indirect.c */ 2582 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2583 struct ext4_map_blocks *map, int flags); 2584 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter); 2585 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2586 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2587 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2588 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2589 ext4_lblk_t start, ext4_lblk_t end); 2590 2591 /* ioctl.c */ 2592 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2593 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2594 2595 /* migrate.c */ 2596 extern int ext4_ext_migrate(struct inode *); 2597 extern int ext4_ind_migrate(struct inode *inode); 2598 2599 /* namei.c */ 2600 extern int ext4_dirent_csum_verify(struct inode *inode, 2601 struct ext4_dir_entry *dirent); 2602 extern int ext4_orphan_add(handle_t *, struct inode *); 2603 extern int ext4_orphan_del(handle_t *, struct inode *); 2604 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2605 __u32 start_minor_hash, __u32 *next_hash); 2606 extern int ext4_search_dir(struct buffer_head *bh, 2607 char *search_buf, 2608 int buf_size, 2609 struct inode *dir, 2610 struct ext4_filename *fname, 2611 const struct qstr *d_name, 2612 unsigned int offset, 2613 struct ext4_dir_entry_2 **res_dir); 2614 extern int ext4_generic_delete_entry(handle_t *handle, 2615 struct inode *dir, 2616 struct ext4_dir_entry_2 *de_del, 2617 struct buffer_head *bh, 2618 void *entry_buf, 2619 int buf_size, 2620 int csum_size); 2621 extern int ext4_empty_dir(struct inode *inode); 2622 2623 /* resize.c */ 2624 extern int ext4_group_add(struct super_block *sb, 2625 struct ext4_new_group_data *input); 2626 extern int ext4_group_extend(struct super_block *sb, 2627 struct ext4_super_block *es, 2628 ext4_fsblk_t n_blocks_count); 2629 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2630 2631 /* super.c */ 2632 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2633 extern int ext4_calculate_overhead(struct super_block *sb); 2634 extern void ext4_superblock_csum_set(struct super_block *sb); 2635 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2636 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2637 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2638 ext4_group_t ngroup); 2639 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2640 char nbuf[16]); 2641 2642 extern __printf(4, 5) 2643 void __ext4_error(struct super_block *, const char *, unsigned int, 2644 const char *, ...); 2645 extern __printf(5, 6) 2646 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2647 const char *, ...); 2648 extern __printf(5, 6) 2649 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2650 const char *, ...); 2651 extern void __ext4_std_error(struct super_block *, const char *, 2652 unsigned int, int); 2653 extern __printf(4, 5) 2654 void __ext4_abort(struct super_block *, const char *, unsigned int, 2655 const char *, ...); 2656 extern __printf(4, 5) 2657 void __ext4_warning(struct super_block *, const char *, unsigned int, 2658 const char *, ...); 2659 extern __printf(4, 5) 2660 void __ext4_warning_inode(const struct inode *inode, const char *function, 2661 unsigned int line, const char *fmt, ...); 2662 extern __printf(3, 4) 2663 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2664 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2665 const char *, unsigned int, const char *); 2666 extern __printf(7, 8) 2667 void __ext4_grp_locked_error(const char *, unsigned int, 2668 struct super_block *, ext4_group_t, 2669 unsigned long, ext4_fsblk_t, 2670 const char *, ...); 2671 2672 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2673 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2674 2675 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2676 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2677 2678 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2679 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2680 2681 #ifdef CONFIG_PRINTK 2682 2683 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2684 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2685 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2686 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2687 #define ext4_error(sb, fmt, ...) \ 2688 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2689 #define ext4_abort(sb, fmt, ...) \ 2690 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2691 #define ext4_warning(sb, fmt, ...) \ 2692 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2693 #define ext4_warning_inode(inode, fmt, ...) \ 2694 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2695 #define ext4_msg(sb, level, fmt, ...) \ 2696 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2697 #define dump_mmp_msg(sb, mmp, msg) \ 2698 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2699 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2700 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2701 fmt, ##__VA_ARGS__) 2702 2703 #else 2704 2705 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2706 do { \ 2707 no_printk(fmt, ##__VA_ARGS__); \ 2708 __ext4_error_inode(inode, "", 0, block, " "); \ 2709 } while (0) 2710 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2711 do { \ 2712 no_printk(fmt, ##__VA_ARGS__); \ 2713 __ext4_error_file(file, "", 0, block, " "); \ 2714 } while (0) 2715 #define ext4_error(sb, fmt, ...) \ 2716 do { \ 2717 no_printk(fmt, ##__VA_ARGS__); \ 2718 __ext4_error(sb, "", 0, " "); \ 2719 } while (0) 2720 #define ext4_abort(sb, fmt, ...) \ 2721 do { \ 2722 no_printk(fmt, ##__VA_ARGS__); \ 2723 __ext4_abort(sb, "", 0, " "); \ 2724 } while (0) 2725 #define ext4_warning(sb, fmt, ...) \ 2726 do { \ 2727 no_printk(fmt, ##__VA_ARGS__); \ 2728 __ext4_warning(sb, "", 0, " "); \ 2729 } while (0) 2730 #define ext4_warning_inode(inode, fmt, ...) \ 2731 do { \ 2732 no_printk(fmt, ##__VA_ARGS__); \ 2733 __ext4_warning_inode(inode, "", 0, " "); \ 2734 } while (0) 2735 #define ext4_msg(sb, level, fmt, ...) \ 2736 do { \ 2737 no_printk(fmt, ##__VA_ARGS__); \ 2738 __ext4_msg(sb, "", " "); \ 2739 } while (0) 2740 #define dump_mmp_msg(sb, mmp, msg) \ 2741 __dump_mmp_msg(sb, mmp, "", 0, "") 2742 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2743 do { \ 2744 no_printk(fmt, ##__VA_ARGS__); \ 2745 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2746 } while (0) 2747 2748 #endif 2749 2750 extern void ext4_update_dynamic_rev(struct super_block *sb); 2751 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2752 __u32 compat); 2753 extern int ext4_update_rocompat_feature(handle_t *handle, 2754 struct super_block *sb, __u32 rocompat); 2755 extern int ext4_update_incompat_feature(handle_t *handle, 2756 struct super_block *sb, __u32 incompat); 2757 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2758 struct ext4_group_desc *bg); 2759 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2760 struct ext4_group_desc *bg); 2761 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2762 struct ext4_group_desc *bg); 2763 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2764 struct ext4_group_desc *bg); 2765 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2766 struct ext4_group_desc *bg); 2767 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2768 struct ext4_group_desc *bg); 2769 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2770 struct ext4_group_desc *bg); 2771 extern void ext4_block_bitmap_set(struct super_block *sb, 2772 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2773 extern void ext4_inode_bitmap_set(struct super_block *sb, 2774 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2775 extern void ext4_inode_table_set(struct super_block *sb, 2776 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2777 extern void ext4_free_group_clusters_set(struct super_block *sb, 2778 struct ext4_group_desc *bg, 2779 __u32 count); 2780 extern void ext4_free_inodes_set(struct super_block *sb, 2781 struct ext4_group_desc *bg, __u32 count); 2782 extern void ext4_used_dirs_set(struct super_block *sb, 2783 struct ext4_group_desc *bg, __u32 count); 2784 extern void ext4_itable_unused_set(struct super_block *sb, 2785 struct ext4_group_desc *bg, __u32 count); 2786 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2787 struct ext4_group_desc *gdp); 2788 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2789 struct ext4_group_desc *gdp); 2790 extern int ext4_register_li_request(struct super_block *sb, 2791 ext4_group_t first_not_zeroed); 2792 2793 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2794 { 2795 return ext4_has_feature_gdt_csum(sb) || 2796 EXT4_SB(sb)->s_chksum_driver != NULL; 2797 } 2798 2799 static inline int ext4_has_metadata_csum(struct super_block *sb) 2800 { 2801 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2802 !EXT4_SB(sb)->s_chksum_driver); 2803 2804 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2805 } 2806 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2807 { 2808 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2809 le32_to_cpu(es->s_blocks_count_lo); 2810 } 2811 2812 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2813 { 2814 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2815 le32_to_cpu(es->s_r_blocks_count_lo); 2816 } 2817 2818 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2819 { 2820 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2821 le32_to_cpu(es->s_free_blocks_count_lo); 2822 } 2823 2824 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2825 ext4_fsblk_t blk) 2826 { 2827 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2828 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2829 } 2830 2831 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2832 ext4_fsblk_t blk) 2833 { 2834 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2835 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2836 } 2837 2838 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2839 ext4_fsblk_t blk) 2840 { 2841 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2842 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2843 } 2844 2845 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2846 { 2847 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2848 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2849 le32_to_cpu(raw_inode->i_size_lo); 2850 else 2851 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2852 } 2853 2854 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2855 { 2856 raw_inode->i_size_lo = cpu_to_le32(i_size); 2857 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2858 } 2859 2860 static inline 2861 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2862 ext4_group_t group) 2863 { 2864 struct ext4_group_info ***grp_info; 2865 long indexv, indexh; 2866 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2867 grp_info = EXT4_SB(sb)->s_group_info; 2868 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2869 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2870 return grp_info[indexv][indexh]; 2871 } 2872 2873 /* 2874 * Reading s_groups_count requires using smp_rmb() afterwards. See 2875 * the locking protocol documented in the comments of ext4_group_add() 2876 * in resize.c 2877 */ 2878 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2879 { 2880 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2881 2882 smp_rmb(); 2883 return ngroups; 2884 } 2885 2886 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2887 ext4_group_t block_group) 2888 { 2889 return block_group >> sbi->s_log_groups_per_flex; 2890 } 2891 2892 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2893 { 2894 return 1 << sbi->s_log_groups_per_flex; 2895 } 2896 2897 #define ext4_std_error(sb, errno) \ 2898 do { \ 2899 if ((errno)) \ 2900 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2901 } while (0) 2902 2903 #ifdef CONFIG_SMP 2904 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2905 * counters. So we need to make sure we have free clusters more 2906 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2907 */ 2908 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2909 #else 2910 #define EXT4_FREECLUSTERS_WATERMARK 0 2911 #endif 2912 2913 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2914 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2915 { 2916 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2917 !inode_is_locked(inode)); 2918 down_write(&EXT4_I(inode)->i_data_sem); 2919 if (newsize > EXT4_I(inode)->i_disksize) 2920 EXT4_I(inode)->i_disksize = newsize; 2921 up_write(&EXT4_I(inode)->i_data_sem); 2922 } 2923 2924 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2925 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2926 { 2927 int changed = 0; 2928 2929 if (newsize > inode->i_size) { 2930 i_size_write(inode, newsize); 2931 changed = 1; 2932 } 2933 if (newsize > EXT4_I(inode)->i_disksize) { 2934 ext4_update_i_disksize(inode, newsize); 2935 changed |= 2; 2936 } 2937 return changed; 2938 } 2939 2940 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2941 loff_t len); 2942 2943 struct ext4_group_info { 2944 unsigned long bb_state; 2945 struct rb_root bb_free_root; 2946 ext4_grpblk_t bb_first_free; /* first free block */ 2947 ext4_grpblk_t bb_free; /* total free blocks */ 2948 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2949 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2950 struct list_head bb_prealloc_list; 2951 #ifdef DOUBLE_CHECK 2952 void *bb_bitmap; 2953 #endif 2954 struct rw_semaphore alloc_sem; 2955 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2956 * regions, index is order. 2957 * bb_counters[3] = 5 means 2958 * 5 free 8-block regions. */ 2959 }; 2960 2961 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2962 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2963 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2964 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2965 2966 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2967 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2968 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2969 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2970 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2971 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2972 2973 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2974 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2975 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2976 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2977 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2978 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2979 2980 #define EXT4_MAX_CONTENTION 8 2981 #define EXT4_CONTENTION_THRESHOLD 2 2982 2983 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2984 ext4_group_t group) 2985 { 2986 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2987 } 2988 2989 /* 2990 * Returns true if the filesystem is busy enough that attempts to 2991 * access the block group locks has run into contention. 2992 */ 2993 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2994 { 2995 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2996 } 2997 2998 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2999 { 3000 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3001 if (spin_trylock(lock)) 3002 /* 3003 * We're able to grab the lock right away, so drop the 3004 * lock contention counter. 3005 */ 3006 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3007 else { 3008 /* 3009 * The lock is busy, so bump the contention counter, 3010 * and then wait on the spin lock. 3011 */ 3012 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3013 EXT4_MAX_CONTENTION); 3014 spin_lock(lock); 3015 } 3016 } 3017 3018 static inline void ext4_unlock_group(struct super_block *sb, 3019 ext4_group_t group) 3020 { 3021 spin_unlock(ext4_group_lock_ptr(sb, group)); 3022 } 3023 3024 /* 3025 * Block validity checking 3026 */ 3027 #define ext4_check_indirect_blockref(inode, bh) \ 3028 ext4_check_blockref(__func__, __LINE__, inode, \ 3029 (__le32 *)(bh)->b_data, \ 3030 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3031 3032 #define ext4_ind_check_inode(inode) \ 3033 ext4_check_blockref(__func__, __LINE__, inode, \ 3034 EXT4_I(inode)->i_data, \ 3035 EXT4_NDIR_BLOCKS) 3036 3037 /* 3038 * Inodes and files operations 3039 */ 3040 3041 /* dir.c */ 3042 extern const struct file_operations ext4_dir_operations; 3043 3044 /* file.c */ 3045 extern const struct inode_operations ext4_file_inode_operations; 3046 extern const struct file_operations ext4_file_operations; 3047 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3048 3049 /* inline.c */ 3050 extern int ext4_get_max_inline_size(struct inode *inode); 3051 extern int ext4_find_inline_data_nolock(struct inode *inode); 3052 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3053 unsigned int len); 3054 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3055 3056 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3057 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3058 struct inode *inode, 3059 loff_t pos, unsigned len, 3060 unsigned flags, 3061 struct page **pagep); 3062 extern int ext4_write_inline_data_end(struct inode *inode, 3063 loff_t pos, unsigned len, 3064 unsigned copied, 3065 struct page *page); 3066 extern struct buffer_head * 3067 ext4_journalled_write_inline_data(struct inode *inode, 3068 unsigned len, 3069 struct page *page); 3070 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3071 struct inode *inode, 3072 loff_t pos, unsigned len, 3073 unsigned flags, 3074 struct page **pagep, 3075 void **fsdata); 3076 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3077 unsigned len, unsigned copied, 3078 struct page *page); 3079 extern int ext4_try_add_inline_entry(handle_t *handle, 3080 struct ext4_filename *fname, 3081 struct inode *dir, struct inode *inode); 3082 extern int ext4_try_create_inline_dir(handle_t *handle, 3083 struct inode *parent, 3084 struct inode *inode); 3085 extern int ext4_read_inline_dir(struct file *filp, 3086 struct dir_context *ctx, 3087 int *has_inline_data); 3088 extern int htree_inlinedir_to_tree(struct file *dir_file, 3089 struct inode *dir, ext4_lblk_t block, 3090 struct dx_hash_info *hinfo, 3091 __u32 start_hash, __u32 start_minor_hash, 3092 int *has_inline_data); 3093 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3094 struct ext4_filename *fname, 3095 const struct qstr *d_name, 3096 struct ext4_dir_entry_2 **res_dir, 3097 int *has_inline_data); 3098 extern int ext4_delete_inline_entry(handle_t *handle, 3099 struct inode *dir, 3100 struct ext4_dir_entry_2 *de_del, 3101 struct buffer_head *bh, 3102 int *has_inline_data); 3103 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 3104 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3105 struct ext4_dir_entry_2 **parent_de, 3106 int *retval); 3107 extern int ext4_inline_data_fiemap(struct inode *inode, 3108 struct fiemap_extent_info *fieinfo, 3109 int *has_inline, __u64 start, __u64 len); 3110 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3111 struct inode *inode, 3112 int needed); 3113 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3114 3115 extern int ext4_convert_inline_data(struct inode *inode); 3116 3117 static inline int ext4_has_inline_data(struct inode *inode) 3118 { 3119 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3120 EXT4_I(inode)->i_inline_off; 3121 } 3122 3123 /* namei.c */ 3124 extern const struct inode_operations ext4_dir_inode_operations; 3125 extern const struct inode_operations ext4_special_inode_operations; 3126 extern struct dentry *ext4_get_parent(struct dentry *child); 3127 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3128 struct ext4_dir_entry_2 *de, 3129 int blocksize, int csum_size, 3130 unsigned int parent_ino, int dotdot_real_len); 3131 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3132 unsigned int blocksize); 3133 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3134 struct inode *inode, 3135 struct buffer_head *bh); 3136 #define S_SHIFT 12 3137 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3138 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3139 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3140 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3141 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3142 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3143 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3144 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3145 }; 3146 3147 static inline void ext4_set_de_type(struct super_block *sb, 3148 struct ext4_dir_entry_2 *de, 3149 umode_t mode) { 3150 if (ext4_has_feature_filetype(sb)) 3151 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3152 } 3153 3154 /* readpages.c */ 3155 extern int ext4_mpage_readpages(struct address_space *mapping, 3156 struct list_head *pages, struct page *page, 3157 unsigned nr_pages); 3158 3159 /* symlink.c */ 3160 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3161 extern const struct inode_operations ext4_symlink_inode_operations; 3162 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3163 3164 /* sysfs.c */ 3165 extern int ext4_register_sysfs(struct super_block *sb); 3166 extern void ext4_unregister_sysfs(struct super_block *sb); 3167 extern int __init ext4_init_sysfs(void); 3168 extern void ext4_exit_sysfs(void); 3169 3170 /* block_validity */ 3171 extern void ext4_release_system_zone(struct super_block *sb); 3172 extern int ext4_setup_system_zone(struct super_block *sb); 3173 extern int __init ext4_init_system_zone(void); 3174 extern void ext4_exit_system_zone(void); 3175 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3176 ext4_fsblk_t start_blk, 3177 unsigned int count); 3178 extern int ext4_check_blockref(const char *, unsigned int, 3179 struct inode *, __le32 *, unsigned int); 3180 3181 /* extents.c */ 3182 struct ext4_ext_path; 3183 struct ext4_extent; 3184 3185 /* 3186 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3187 * __le32. 3188 */ 3189 #define EXT_MAX_BLOCKS 0xffffffff 3190 3191 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3192 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3193 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3194 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3195 struct ext4_map_blocks *map, int flags); 3196 extern void ext4_ext_truncate(handle_t *, struct inode *); 3197 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3198 ext4_lblk_t end); 3199 extern void ext4_ext_init(struct super_block *); 3200 extern void ext4_ext_release(struct super_block *); 3201 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3202 loff_t len); 3203 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3204 loff_t offset, ssize_t len); 3205 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3206 struct ext4_map_blocks *map, int flags); 3207 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3208 ext4_lblk_t lblocks); 3209 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3210 int num, 3211 struct ext4_ext_path *path); 3212 extern int ext4_can_extents_be_merged(struct inode *inode, 3213 struct ext4_extent *ex1, 3214 struct ext4_extent *ex2); 3215 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3216 struct ext4_ext_path **, 3217 struct ext4_extent *, int); 3218 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3219 struct ext4_ext_path **, 3220 int flags); 3221 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3222 extern int ext4_ext_check_inode(struct inode *inode); 3223 extern int ext4_find_delalloc_range(struct inode *inode, 3224 ext4_lblk_t lblk_start, 3225 ext4_lblk_t lblk_end); 3226 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3227 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3228 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3229 __u64 start, __u64 len); 3230 extern int ext4_ext_precache(struct inode *inode); 3231 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3232 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3233 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3234 struct inode *inode2, ext4_lblk_t lblk1, 3235 ext4_lblk_t lblk2, ext4_lblk_t count, 3236 int mark_unwritten,int *err); 3237 3238 /* move_extent.c */ 3239 extern void ext4_double_down_write_data_sem(struct inode *first, 3240 struct inode *second); 3241 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3242 struct inode *donor_inode); 3243 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3244 __u64 start_orig, __u64 start_donor, 3245 __u64 len, __u64 *moved_len); 3246 3247 /* page-io.c */ 3248 extern int __init ext4_init_pageio(void); 3249 extern void ext4_exit_pageio(void); 3250 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3251 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3252 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3253 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3254 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3255 struct writeback_control *wbc); 3256 extern void ext4_end_io_rsv_work(struct work_struct *work); 3257 extern void ext4_io_submit(struct ext4_io_submit *io); 3258 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3259 struct page *page, 3260 int len, 3261 struct writeback_control *wbc, 3262 bool keep_towrite); 3263 3264 /* mmp.c */ 3265 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3266 3267 /* 3268 * Add new method to test whether block and inode bitmaps are properly 3269 * initialized. With uninit_bg reading the block from disk is not enough 3270 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3271 */ 3272 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3273 3274 static inline int bitmap_uptodate(struct buffer_head *bh) 3275 { 3276 return (buffer_uptodate(bh) && 3277 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3278 } 3279 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3280 { 3281 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3282 } 3283 3284 /* 3285 * Disable DIO read nolock optimization, so new dioreaders will be forced 3286 * to grab i_mutex 3287 */ 3288 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3289 { 3290 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3291 smp_mb(); 3292 } 3293 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3294 { 3295 smp_mb(); 3296 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3297 } 3298 3299 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3300 3301 /* For ioend & aio unwritten conversion wait queues */ 3302 #define EXT4_WQ_HASH_SZ 37 3303 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3304 EXT4_WQ_HASH_SZ]) 3305 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3306 3307 #define EXT4_RESIZING 0 3308 extern int ext4_resize_begin(struct super_block *sb); 3309 extern void ext4_resize_end(struct super_block *sb); 3310 3311 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3312 struct ext4_io_end *io_end) 3313 { 3314 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3315 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3316 atomic_inc(&EXT4_I(inode)->i_unwritten); 3317 } 3318 } 3319 3320 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3321 { 3322 struct inode *inode = io_end->inode; 3323 3324 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3325 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3326 /* Wake up anyone waiting on unwritten extent conversion */ 3327 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3328 wake_up_all(ext4_ioend_wq(inode)); 3329 } 3330 } 3331 3332 #endif /* __KERNEL__ */ 3333 3334 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3335 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3336 3337 #endif /* _EXT4_H */ 3338