1// SPDX-License-Identifier: GPL-2.0 2/* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17#ifndef _EXT4_H 18#define _EXT4_H 19 20#include <linux/refcount.h> 21#include <linux/types.h> 22#include <linux/blkdev.h> 23#include <linux/magic.h> 24#include <linux/jbd2.h> 25#include <linux/quota.h> 26#include <linux/rwsem.h> 27#include <linux/rbtree.h> 28#include <linux/seqlock.h> 29#include <linux/mutex.h> 30#include <linux/timer.h> 31#include <linux/wait.h> 32#include <linux/sched/signal.h> 33#include <linux/blockgroup_lock.h> 34#include <linux/percpu_counter.h> 35#include <linux/ratelimit.h> 36#include <crypto/hash.h> 37#include <linux/falloc.h> 38#include <linux/percpu-rwsem.h> 39#include <linux/fiemap.h> 40#ifdef __KERNEL__ 41#include <linux/compat.h> 42#endif 43#include <uapi/linux/ext4.h> 44 45#include <linux/fscrypt.h> 46#include <linux/fsverity.h> 47 48#include <linux/compiler.h> 49 50/* 51 * The fourth extended filesystem constants/structures 52 */ 53 54/* 55 * with AGGRESSIVE_CHECK allocator runs consistency checks over 56 * structures. these checks slow things down a lot 57 */ 58#define AGGRESSIVE_CHECK__ 59 60/* 61 * with DOUBLE_CHECK defined mballoc creates persistent in-core 62 * bitmaps, maintains and uses them to check for double allocations 63 */ 64#define DOUBLE_CHECK__ 65 66/* 67 * Define EXT4FS_DEBUG to produce debug messages 68 */ 69#undef EXT4FS_DEBUG 70 71/* 72 * Debug code 73 */ 74#ifdef EXT4FS_DEBUG 75#define ext4_debug(f, a...) \ 76 do { \ 77 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 78 __FILE__, __LINE__, __func__); \ 79 printk(KERN_DEBUG f, ## a); \ 80 } while (0) 81#else 82#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 83#endif 84 85 /* 86 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 87 */ 88#define EXT_DEBUG__ 89 90/* 91 * Dynamic printk for controlled extents debugging. 92 */ 93#ifdef CONFIG_EXT4_DEBUG 94#define ext_debug(ino, fmt, ...) \ 95 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 96 current->comm, task_pid_nr(current), \ 97 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 98 __func__, ##__VA_ARGS__) 99#else 100#define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 101#endif 102 103#define ASSERT(assert) \ 104do { \ 105 if (unlikely(!(assert))) { \ 106 printk(KERN_EMERG \ 107 "Assertion failure in %s() at %s:%d: '%s'\n", \ 108 __func__, __FILE__, __LINE__, #assert); \ 109 BUG(); \ 110 } \ 111} while (0) 112 113/* data type for block offset of block group */ 114typedef int ext4_grpblk_t; 115 116/* data type for filesystem-wide blocks number */ 117typedef unsigned long long ext4_fsblk_t; 118 119/* data type for file logical block number */ 120typedef __u32 ext4_lblk_t; 121 122/* data type for block group number */ 123typedef unsigned int ext4_group_t; 124 125enum SHIFT_DIRECTION { 126 SHIFT_LEFT = 0, 127 SHIFT_RIGHT, 128}; 129 130/* 131 * For each criteria, mballoc has slightly different way of finding 132 * the required blocks nad usually, higher the criteria the slower the 133 * allocation. We start at lower criterias and keep falling back to 134 * higher ones if we are not able to find any blocks. Lower (earlier) 135 * criteria are faster. 136 */ 137enum criteria { 138 /* 139 * Used when number of blocks needed is a power of 2. This 140 * doesn't trigger any disk IO except prefetch and is the 141 * fastest criteria. 142 */ 143 CR_POWER2_ALIGNED, 144 145 /* 146 * Tries to lookup in-memory data structures to find the most 147 * suitable group that satisfies goal request. No disk IO 148 * except block prefetch. 149 */ 150 CR_GOAL_LEN_FAST, 151 152 /* 153 * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal 154 * length to the best available length for faster allocation. 155 */ 156 CR_BEST_AVAIL_LEN, 157 158 /* 159 * Reads each block group sequentially, performing disk IO if 160 * necessary, to find find_suitable block group. Tries to 161 * allocate goal length but might trim the request if nothing 162 * is found after enough tries. 163 */ 164 CR_GOAL_LEN_SLOW, 165 166 /* 167 * Finds the first free set of blocks and allocates 168 * those. This is only used in rare cases when 169 * CR_GOAL_LEN_SLOW also fails to allocate anything. 170 */ 171 CR_ANY_FREE, 172 173 /* 174 * Number of criterias defined. 175 */ 176 EXT4_MB_NUM_CRS 177}; 178 179/* 180 * Flags used in mballoc's allocation_context flags field. 181 * 182 * Also used to show what's going on for debugging purposes when the 183 * flag field is exported via the traceport interface 184 */ 185 186/* prefer goal again. length */ 187#define EXT4_MB_HINT_MERGE 0x0001 188/* blocks already reserved */ 189#define EXT4_MB_HINT_RESERVED 0x0002 190/* metadata is being allocated */ 191#define EXT4_MB_HINT_METADATA 0x0004 192/* first blocks in the file */ 193#define EXT4_MB_HINT_FIRST 0x0008 194/* search for the best chunk */ 195#define EXT4_MB_HINT_BEST 0x0010 196/* data is being allocated */ 197#define EXT4_MB_HINT_DATA 0x0020 198/* don't preallocate (for tails) */ 199#define EXT4_MB_HINT_NOPREALLOC 0x0040 200/* allocate for locality group */ 201#define EXT4_MB_HINT_GROUP_ALLOC 0x0080 202/* allocate goal blocks or none */ 203#define EXT4_MB_HINT_GOAL_ONLY 0x0100 204/* goal is meaningful */ 205#define EXT4_MB_HINT_TRY_GOAL 0x0200 206/* blocks already pre-reserved by delayed allocation */ 207#define EXT4_MB_DELALLOC_RESERVED 0x0400 208/* We are doing stream allocation */ 209#define EXT4_MB_STREAM_ALLOC 0x0800 210/* Use reserved root blocks if needed */ 211#define EXT4_MB_USE_ROOT_BLOCKS 0x1000 212/* Use blocks from reserved pool */ 213#define EXT4_MB_USE_RESERVED 0x2000 214/* Do strict check for free blocks while retrying block allocation */ 215#define EXT4_MB_STRICT_CHECK 0x4000 216/* Large fragment size list lookup succeeded at least once for cr = 0 */ 217#define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED 0x8000 218/* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ 219#define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED 0x00010000 220/* Avg fragment size rb tree lookup succeeded at least once for cr = 1.5 */ 221#define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED 0x00020000 222 223struct ext4_allocation_request { 224 /* target inode for block we're allocating */ 225 struct inode *inode; 226 /* how many blocks we want to allocate */ 227 unsigned int len; 228 /* logical block in target inode */ 229 ext4_lblk_t logical; 230 /* the closest logical allocated block to the left */ 231 ext4_lblk_t lleft; 232 /* the closest logical allocated block to the right */ 233 ext4_lblk_t lright; 234 /* phys. target (a hint) */ 235 ext4_fsblk_t goal; 236 /* phys. block for the closest logical allocated block to the left */ 237 ext4_fsblk_t pleft; 238 /* phys. block for the closest logical allocated block to the right */ 239 ext4_fsblk_t pright; 240 /* flags. see above EXT4_MB_HINT_* */ 241 unsigned int flags; 242}; 243 244/* 245 * Logical to physical block mapping, used by ext4_map_blocks() 246 * 247 * This structure is used to pass requests into ext4_map_blocks() as 248 * well as to store the information returned by ext4_map_blocks(). It 249 * takes less room on the stack than a struct buffer_head. 250 */ 251#define EXT4_MAP_NEW BIT(BH_New) 252#define EXT4_MAP_MAPPED BIT(BH_Mapped) 253#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 254#define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 255#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 256 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 257 258struct ext4_map_blocks { 259 ext4_fsblk_t m_pblk; 260 ext4_lblk_t m_lblk; 261 unsigned int m_len; 262 unsigned int m_flags; 263}; 264 265/* 266 * Block validity checking, system zone rbtree. 267 */ 268struct ext4_system_blocks { 269 struct rb_root root; 270 struct rcu_head rcu; 271}; 272 273/* 274 * Flags for ext4_io_end->flags 275 */ 276#define EXT4_IO_END_UNWRITTEN 0x0001 277 278struct ext4_io_end_vec { 279 struct list_head list; /* list of io_end_vec */ 280 loff_t offset; /* offset in the file */ 281 ssize_t size; /* size of the extent */ 282}; 283 284/* 285 * For converting unwritten extents on a work queue. 'handle' is used for 286 * buffered writeback. 287 */ 288typedef struct ext4_io_end { 289 struct list_head list; /* per-file finished IO list */ 290 handle_t *handle; /* handle reserved for extent 291 * conversion */ 292 struct inode *inode; /* file being written to */ 293 struct bio *bio; /* Linked list of completed 294 * bios covering the extent */ 295 unsigned int flag; /* unwritten or not */ 296 refcount_t count; /* reference counter */ 297 struct list_head list_vec; /* list of ext4_io_end_vec */ 298} ext4_io_end_t; 299 300struct ext4_io_submit { 301 struct writeback_control *io_wbc; 302 struct bio *io_bio; 303 ext4_io_end_t *io_end; 304 sector_t io_next_block; 305}; 306 307/* 308 * Special inodes numbers 309 */ 310#define EXT4_BAD_INO 1 /* Bad blocks inode */ 311#define EXT4_ROOT_INO 2 /* Root inode */ 312#define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 313#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 314#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 315#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 316#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 317#define EXT4_JOURNAL_INO 8 /* Journal inode */ 318 319/* First non-reserved inode for old ext4 filesystems */ 320#define EXT4_GOOD_OLD_FIRST_INO 11 321 322/* 323 * Maximal count of links to a file 324 */ 325#define EXT4_LINK_MAX 65000 326 327/* 328 * Macro-instructions used to manage several block sizes 329 */ 330#define EXT4_MIN_BLOCK_SIZE 1024 331#define EXT4_MAX_BLOCK_SIZE 65536 332#define EXT4_MIN_BLOCK_LOG_SIZE 10 333#define EXT4_MAX_BLOCK_LOG_SIZE 16 334#define EXT4_MAX_CLUSTER_LOG_SIZE 30 335#ifdef __KERNEL__ 336# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 337#else 338# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 339#endif 340#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 341#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 342 EXT4_SB(s)->s_cluster_bits) 343#ifdef __KERNEL__ 344# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 345# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 346#else 347# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 348#endif 349#ifdef __KERNEL__ 350#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 351#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 352#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 353#else 354#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 355 EXT4_GOOD_OLD_INODE_SIZE : \ 356 (s)->s_inode_size) 357#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 358 EXT4_GOOD_OLD_FIRST_INO : \ 359 (s)->s_first_ino) 360#endif 361#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 362#define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 363 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 364 blkbits)) 365 366/* Translate a block number to a cluster number */ 367#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 368/* Translate a cluster number to a block number */ 369#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 370/* Translate # of blks to # of clusters */ 371#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 372 (sbi)->s_cluster_bits) 373/* Mask out the low bits to get the starting block of the cluster */ 374#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 375 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 376#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 377 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 378/* Fill in the low bits to get the last block of the cluster */ 379#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 380 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 381/* Get the cluster offset */ 382#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 383 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 384#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 385 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 386 387/* 388 * Structure of a blocks group descriptor 389 */ 390struct ext4_group_desc 391{ 392 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 393 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 394 __le32 bg_inode_table_lo; /* Inodes table block */ 395 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 396 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 397 __le16 bg_used_dirs_count_lo; /* Directories count */ 398 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 399 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 400 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 401 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 402 __le16 bg_itable_unused_lo; /* Unused inodes count */ 403 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 404 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 405 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 406 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 407 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 408 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 409 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 410 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 411 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 412 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 413 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 414 __u32 bg_reserved; 415}; 416 417#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 418 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 419 sizeof(__le16)) 420#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 421 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 422 sizeof(__le16)) 423 424/* 425 * Structure of a flex block group info 426 */ 427 428struct flex_groups { 429 atomic64_t free_clusters; 430 atomic_t free_inodes; 431 atomic_t used_dirs; 432}; 433 434#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 435#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 436#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 437 438/* 439 * Macro-instructions used to manage group descriptors 440 */ 441#define EXT4_MIN_DESC_SIZE 32 442#define EXT4_MIN_DESC_SIZE_64BIT 64 443#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 444#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 445#ifdef __KERNEL__ 446# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 447# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 448# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 449# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 450# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 451#else 452# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 453# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 454# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 455#endif 456 457/* 458 * Constants relative to the data blocks 459 */ 460#define EXT4_NDIR_BLOCKS 12 461#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 462#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 463#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 464#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 465 466/* 467 * Inode flags 468 */ 469#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 470#define EXT4_UNRM_FL 0x00000002 /* Undelete */ 471#define EXT4_COMPR_FL 0x00000004 /* Compress file */ 472#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 473#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 474#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 475#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 476#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 477/* Reserved for compression usage... */ 478#define EXT4_DIRTY_FL 0x00000100 479#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 480#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 481 /* nb: was previously EXT2_ECOMPR_FL */ 482#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 483/* End compression flags --- maybe not all used */ 484#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 485#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 486#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 487#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 488#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 489#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 490#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 491#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 492#define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 493#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 494/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 495 496#define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 497 498#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 499#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 500#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 501#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 502 503/* User modifiable flags */ 504#define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 505 EXT4_UNRM_FL | \ 506 EXT4_COMPR_FL | \ 507 EXT4_SYNC_FL | \ 508 EXT4_IMMUTABLE_FL | \ 509 EXT4_APPEND_FL | \ 510 EXT4_NODUMP_FL | \ 511 EXT4_NOATIME_FL | \ 512 EXT4_JOURNAL_DATA_FL | \ 513 EXT4_NOTAIL_FL | \ 514 EXT4_DIRSYNC_FL | \ 515 EXT4_TOPDIR_FL | \ 516 EXT4_EXTENTS_FL | \ 517 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 518 EXT4_DAX_FL | \ 519 EXT4_PROJINHERIT_FL | \ 520 EXT4_CASEFOLD_FL) 521 522/* User visible flags */ 523#define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 524 EXT4_DIRTY_FL | \ 525 EXT4_COMPRBLK_FL | \ 526 EXT4_NOCOMPR_FL | \ 527 EXT4_ENCRYPT_FL | \ 528 EXT4_INDEX_FL | \ 529 EXT4_VERITY_FL | \ 530 EXT4_INLINE_DATA_FL) 531 532/* Flags that should be inherited by new inodes from their parent. */ 533#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 534 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 535 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 536 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 537 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 538 EXT4_DAX_FL) 539 540/* Flags that are appropriate for regular files (all but dir-specific ones). */ 541#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 542 EXT4_PROJINHERIT_FL)) 543 544/* Flags that are appropriate for non-directories/regular files. */ 545#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 546 547/* The only flags that should be swapped */ 548#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 549 550/* Flags which are mutually exclusive to DAX */ 551#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 552 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 553 554/* Mask out flags that are inappropriate for the given type of inode. */ 555static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 556{ 557 if (S_ISDIR(mode)) 558 return flags; 559 else if (S_ISREG(mode)) 560 return flags & EXT4_REG_FLMASK; 561 else 562 return flags & EXT4_OTHER_FLMASK; 563} 564 565/* 566 * Inode flags used for atomic set/get 567 */ 568enum { 569 EXT4_INODE_SECRM = 0, /* Secure deletion */ 570 EXT4_INODE_UNRM = 1, /* Undelete */ 571 EXT4_INODE_COMPR = 2, /* Compress file */ 572 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 573 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 574 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 575 EXT4_INODE_NODUMP = 6, /* do not dump file */ 576 EXT4_INODE_NOATIME = 7, /* do not update atime */ 577/* Reserved for compression usage... */ 578 EXT4_INODE_DIRTY = 8, 579 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 580 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 581 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 582/* End compression flags --- maybe not all used */ 583 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 584 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 585 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 586 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 587 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 588 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 589 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 590 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 591 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 592 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 593/* 22 was formerly EXT4_INODE_EOFBLOCKS */ 594 EXT4_INODE_DAX = 25, /* Inode is DAX */ 595 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 596 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 597 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 598 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 599}; 600 601/* 602 * Since it's pretty easy to mix up bit numbers and hex values, we use a 603 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 604 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 605 * any extra space in the compiled kernel image, otherwise, the build will fail. 606 * It's important that these values are the same, since we are using 607 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 608 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 609 * values found in ext2, ext3 and ext4 filesystems, and of course the values 610 * defined in e2fsprogs. 611 * 612 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 613 */ 614#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG)) 615#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 616 617static inline void ext4_check_flag_values(void) 618{ 619 CHECK_FLAG_VALUE(SECRM); 620 CHECK_FLAG_VALUE(UNRM); 621 CHECK_FLAG_VALUE(COMPR); 622 CHECK_FLAG_VALUE(SYNC); 623 CHECK_FLAG_VALUE(IMMUTABLE); 624 CHECK_FLAG_VALUE(APPEND); 625 CHECK_FLAG_VALUE(NODUMP); 626 CHECK_FLAG_VALUE(NOATIME); 627 CHECK_FLAG_VALUE(DIRTY); 628 CHECK_FLAG_VALUE(COMPRBLK); 629 CHECK_FLAG_VALUE(NOCOMPR); 630 CHECK_FLAG_VALUE(ENCRYPT); 631 CHECK_FLAG_VALUE(INDEX); 632 CHECK_FLAG_VALUE(IMAGIC); 633 CHECK_FLAG_VALUE(JOURNAL_DATA); 634 CHECK_FLAG_VALUE(NOTAIL); 635 CHECK_FLAG_VALUE(DIRSYNC); 636 CHECK_FLAG_VALUE(TOPDIR); 637 CHECK_FLAG_VALUE(HUGE_FILE); 638 CHECK_FLAG_VALUE(EXTENTS); 639 CHECK_FLAG_VALUE(VERITY); 640 CHECK_FLAG_VALUE(EA_INODE); 641 CHECK_FLAG_VALUE(INLINE_DATA); 642 CHECK_FLAG_VALUE(PROJINHERIT); 643 CHECK_FLAG_VALUE(CASEFOLD); 644 CHECK_FLAG_VALUE(RESERVED); 645} 646 647#if defined(__KERNEL__) && defined(CONFIG_COMPAT) 648struct compat_ext4_new_group_input { 649 u32 group; 650 compat_u64 block_bitmap; 651 compat_u64 inode_bitmap; 652 compat_u64 inode_table; 653 u32 blocks_count; 654 u16 reserved_blocks; 655 u16 unused; 656}; 657#endif 658 659/* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 660struct ext4_new_group_data { 661 __u32 group; 662 __u64 block_bitmap; 663 __u64 inode_bitmap; 664 __u64 inode_table; 665 __u32 blocks_count; 666 __u16 reserved_blocks; 667 __u16 mdata_blocks; 668 __u32 free_clusters_count; 669}; 670 671/* Indexes used to index group tables in ext4_new_group_data */ 672enum { 673 BLOCK_BITMAP = 0, /* block bitmap */ 674 INODE_BITMAP, /* inode bitmap */ 675 INODE_TABLE, /* inode tables */ 676 GROUP_TABLE_COUNT, 677}; 678 679/* 680 * Flags used by ext4_map_blocks() 681 */ 682 /* Allocate any needed blocks and/or convert an unwritten 683 extent to be an initialized ext4 */ 684#define EXT4_GET_BLOCKS_CREATE 0x0001 685 /* Request the creation of an unwritten extent */ 686#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 687#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 688 EXT4_GET_BLOCKS_CREATE) 689 /* Caller is from the delayed allocation writeout path 690 * finally doing the actual allocation of delayed blocks */ 691#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 692 /* caller is from the direct IO path, request to creation of an 693 unwritten extents if not allocated, split the unwritten 694 extent if blocks has been preallocated already*/ 695#define EXT4_GET_BLOCKS_PRE_IO 0x0008 696#define EXT4_GET_BLOCKS_CONVERT 0x0010 697#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 698 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 699 /* Convert extent to initialized after IO complete */ 700#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 701 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 702 /* Eventual metadata allocation (due to growing extent tree) 703 * should not fail, so try to use reserved blocks for that.*/ 704#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 705 /* Don't normalize allocation size (used for fallocate) */ 706#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 707 /* Convert written extents to unwritten */ 708#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 709 /* Write zeros to newly created written extents */ 710#define EXT4_GET_BLOCKS_ZERO 0x0200 711#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 712 EXT4_GET_BLOCKS_ZERO) 713 /* Caller will submit data before dropping transaction handle. This 714 * allows jbd2 to avoid submitting data before commit. */ 715#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 716 /* Caller is in the atomic contex, find extent if it has been cached */ 717#define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 718 719/* 720 * The bit position of these flags must not overlap with any of the 721 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 722 * read_extent_tree_block(), ext4_split_extent_at(), 723 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 724 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 725 * caching the extents when reading from the extent tree while a 726 * truncate or punch hole operation is in progress. 727 */ 728#define EXT4_EX_NOCACHE 0x40000000 729#define EXT4_EX_FORCE_CACHE 0x20000000 730#define EXT4_EX_NOFAIL 0x10000000 731 732/* 733 * Flags used by ext4_free_blocks 734 */ 735#define EXT4_FREE_BLOCKS_METADATA 0x0001 736#define EXT4_FREE_BLOCKS_FORGET 0x0002 737#define EXT4_FREE_BLOCKS_VALIDATED 0x0004 738#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 739#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 740#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 741#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 742 743#if defined(__KERNEL__) && defined(CONFIG_COMPAT) 744/* 745 * ioctl commands in 32 bit emulation 746 */ 747#define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 748#define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 749#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 750#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 751#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 752#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 753#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 754#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 755#endif 756 757/* Max physical block we can address w/o extents */ 758#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 759 760/* Max logical block we can support */ 761#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 762 763/* 764 * Structure of an inode on the disk 765 */ 766struct ext4_inode { 767 __le16 i_mode; /* File mode */ 768 __le16 i_uid; /* Low 16 bits of Owner Uid */ 769 __le32 i_size_lo; /* Size in bytes */ 770 __le32 i_atime; /* Access time */ 771 __le32 i_ctime; /* Inode Change time */ 772 __le32 i_mtime; /* Modification time */ 773 __le32 i_dtime; /* Deletion Time */ 774 __le16 i_gid; /* Low 16 bits of Group Id */ 775 __le16 i_links_count; /* Links count */ 776 __le32 i_blocks_lo; /* Blocks count */ 777 __le32 i_flags; /* File flags */ 778 union { 779 struct { 780 __le32 l_i_version; 781 } linux1; 782 struct { 783 __u32 h_i_translator; 784 } hurd1; 785 struct { 786 __u32 m_i_reserved1; 787 } masix1; 788 } osd1; /* OS dependent 1 */ 789 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 790 __le32 i_generation; /* File version (for NFS) */ 791 __le32 i_file_acl_lo; /* File ACL */ 792 __le32 i_size_high; 793 __le32 i_obso_faddr; /* Obsoleted fragment address */ 794 union { 795 struct { 796 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 797 __le16 l_i_file_acl_high; 798 __le16 l_i_uid_high; /* these 2 fields */ 799 __le16 l_i_gid_high; /* were reserved2[0] */ 800 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 801 __le16 l_i_reserved; 802 } linux2; 803 struct { 804 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 805 __u16 h_i_mode_high; 806 __u16 h_i_uid_high; 807 __u16 h_i_gid_high; 808 __u32 h_i_author; 809 } hurd2; 810 struct { 811 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 812 __le16 m_i_file_acl_high; 813 __u32 m_i_reserved2[2]; 814 } masix2; 815 } osd2; /* OS dependent 2 */ 816 __le16 i_extra_isize; 817 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 818 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 819 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 820 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 821 __le32 i_crtime; /* File Creation time */ 822 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 823 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 824 __le32 i_projid; /* Project ID */ 825}; 826 827#define EXT4_EPOCH_BITS 2 828#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 829#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 830 831/* 832 * Extended fields will fit into an inode if the filesystem was formatted 833 * with large inodes (-I 256 or larger) and there are not currently any EAs 834 * consuming all of the available space. For new inodes we always reserve 835 * enough space for the kernel's known extended fields, but for inodes 836 * created with an old kernel this might not have been the case. None of 837 * the extended inode fields is critical for correct filesystem operation. 838 * This macro checks if a certain field fits in the inode. Note that 839 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 840 */ 841#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 842 ((offsetof(typeof(*ext4_inode), field) + \ 843 sizeof((ext4_inode)->field)) \ 844 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 845 (einode)->i_extra_isize)) \ 846 847/* 848 * We use an encoding that preserves the times for extra epoch "00": 849 * 850 * extra msb of adjust for signed 851 * epoch 32-bit 32-bit tv_sec to 852 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 853 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 854 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 855 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 856 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 857 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 858 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 859 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 860 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 861 * 862 * Note that previous versions of the kernel on 64-bit systems would 863 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 864 * 1970. e2fsck will correct this, assuming that it is run on the 865 * affected filesystem before 2242. 866 */ 867 868static inline __le32 ext4_encode_extra_time(struct timespec64 ts) 869{ 870 u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK; 871 return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS)); 872} 873 874static inline struct timespec64 ext4_decode_extra_time(__le32 base, 875 __le32 extra) 876{ 877 struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) }; 878 879 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 880 ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 881 ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 882 return ts; 883} 884 885#define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \ 886do { \ 887 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 888 (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \ 889 (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \ 890 } else \ 891 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \ 892} while (0) 893 894#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 895 EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, (inode)->xtime) 896 897#define EXT4_INODE_SET_CTIME(inode, raw_inode) \ 898 EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode)) 899 900#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 901 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 902 EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \ 903 raw_inode, (einode)->xtime) 904 905#define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \ 906 (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \ 907 ext4_decode_extra_time((raw_inode)->xtime, \ 908 (raw_inode)->xtime ## _extra) : \ 909 (struct timespec64) { \ 910 .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \ 911 }) 912 913#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 914do { \ 915 (inode)->xtime = EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode); \ 916} while (0) 917 918#define EXT4_INODE_GET_CTIME(inode, raw_inode) \ 919do { \ 920 inode_set_ctime_to_ts(inode, \ 921 EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \ 922} while (0) 923 924#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 925do { \ 926 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 927 (einode)->xtime = \ 928 EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \ 929 raw_inode); \ 930 else \ 931 (einode)->xtime = (struct timespec64){0, 0}; \ 932} while (0) 933 934#define i_disk_version osd1.linux1.l_i_version 935 936#if defined(__KERNEL__) || defined(__linux__) 937#define i_reserved1 osd1.linux1.l_i_reserved1 938#define i_file_acl_high osd2.linux2.l_i_file_acl_high 939#define i_blocks_high osd2.linux2.l_i_blocks_high 940#define i_uid_low i_uid 941#define i_gid_low i_gid 942#define i_uid_high osd2.linux2.l_i_uid_high 943#define i_gid_high osd2.linux2.l_i_gid_high 944#define i_checksum_lo osd2.linux2.l_i_checksum_lo 945 946#elif defined(__GNU__) 947 948#define i_translator osd1.hurd1.h_i_translator 949#define i_uid_high osd2.hurd2.h_i_uid_high 950#define i_gid_high osd2.hurd2.h_i_gid_high 951#define i_author osd2.hurd2.h_i_author 952 953#elif defined(__masix__) 954 955#define i_reserved1 osd1.masix1.m_i_reserved1 956#define i_file_acl_high osd2.masix2.m_i_file_acl_high 957#define i_reserved2 osd2.masix2.m_i_reserved2 958 959#endif /* defined(__KERNEL__) || defined(__linux__) */ 960 961#include "extents_status.h" 962#include "fast_commit.h" 963 964/* 965 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 966 * 967 * These are needed to avoid lockdep false positives when we need to 968 * allocate blocks to the quota inode during ext4_map_blocks(), while 969 * holding i_data_sem for a normal (non-quota) inode. Since we don't 970 * do quota tracking for the quota inode, this avoids deadlock (as 971 * well as infinite recursion, since it isn't turtles all the way 972 * down...) 973 * 974 * I_DATA_SEM_NORMAL - Used for most inodes 975 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 976 * where the second inode has larger inode number 977 * than the first 978 * I_DATA_SEM_QUOTA - Used for quota inodes only 979 * I_DATA_SEM_EA - Used for ea_inodes only 980 */ 981enum { 982 I_DATA_SEM_NORMAL = 0, 983 I_DATA_SEM_OTHER, 984 I_DATA_SEM_QUOTA, 985 I_DATA_SEM_EA 986}; 987 988 989/* 990 * fourth extended file system inode data in memory 991 */ 992struct ext4_inode_info { 993 __le32 i_data[15]; /* unconverted */ 994 __u32 i_dtime; 995 ext4_fsblk_t i_file_acl; 996 997 /* 998 * i_block_group is the number of the block group which contains 999 * this file's inode. Constant across the lifetime of the inode, 1000 * it is used for making block allocation decisions - we try to 1001 * place a file's data blocks near its inode block, and new inodes 1002 * near to their parent directory's inode. 1003 */ 1004 ext4_group_t i_block_group; 1005 ext4_lblk_t i_dir_start_lookup; 1006#if (BITS_PER_LONG < 64) 1007 unsigned long i_state_flags; /* Dynamic state flags */ 1008#endif 1009 unsigned long i_flags; 1010 1011 /* 1012 * Extended attributes can be read independently of the main file 1013 * data. Taking i_rwsem even when reading would cause contention 1014 * between readers of EAs and writers of regular file data, so 1015 * instead we synchronize on xattr_sem when reading or changing 1016 * EAs. 1017 */ 1018 struct rw_semaphore xattr_sem; 1019 1020 /* 1021 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise 1022 * i_orphan is used. 1023 */ 1024 union { 1025 struct list_head i_orphan; /* unlinked but open inodes */ 1026 unsigned int i_orphan_idx; /* Index in orphan file */ 1027 }; 1028 1029 /* Fast commit related info */ 1030 1031 /* For tracking dentry create updates */ 1032 struct list_head i_fc_dilist; 1033 struct list_head i_fc_list; /* 1034 * inodes that need fast commit 1035 * protected by sbi->s_fc_lock. 1036 */ 1037 1038 /* Start of lblk range that needs to be committed in this fast commit */ 1039 ext4_lblk_t i_fc_lblk_start; 1040 1041 /* End of lblk range that needs to be committed in this fast commit */ 1042 ext4_lblk_t i_fc_lblk_len; 1043 1044 /* Number of ongoing updates on this inode */ 1045 atomic_t i_fc_updates; 1046 1047 /* Fast commit wait queue for this inode */ 1048 wait_queue_head_t i_fc_wait; 1049 1050 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1051 struct mutex i_fc_lock; 1052 1053 /* 1054 * i_disksize keeps track of what the inode size is ON DISK, not 1055 * in memory. During truncate, i_size is set to the new size by 1056 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1057 * set i_disksize to 0 until the truncate is actually under way. 1058 * 1059 * The intent is that i_disksize always represents the blocks which 1060 * are used by this file. This allows recovery to restart truncate 1061 * on orphans if we crash during truncate. We actually write i_disksize 1062 * into the on-disk inode when writing inodes out, instead of i_size. 1063 * 1064 * The only time when i_disksize and i_size may be different is when 1065 * a truncate is in progress. The only things which change i_disksize 1066 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1067 */ 1068 loff_t i_disksize; 1069 1070 /* 1071 * i_data_sem is for serialising ext4_truncate() against 1072 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1073 * data tree are chopped off during truncate. We can't do that in 1074 * ext4 because whenever we perform intermediate commits during 1075 * truncate, the inode and all the metadata blocks *must* be in a 1076 * consistent state which allows truncation of the orphans to restart 1077 * during recovery. Hence we must fix the get_block-vs-truncate race 1078 * by other means, so we have i_data_sem. 1079 */ 1080 struct rw_semaphore i_data_sem; 1081 struct inode vfs_inode; 1082 struct jbd2_inode *jinode; 1083 1084 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1085 1086 /* 1087 * File creation time. Its function is same as that of 1088 * struct timespec64 i_{a,c,m}time in the generic inode. 1089 */ 1090 struct timespec64 i_crtime; 1091 1092 /* mballoc */ 1093 atomic_t i_prealloc_active; 1094 struct rb_root i_prealloc_node; 1095 rwlock_t i_prealloc_lock; 1096 1097 /* extents status tree */ 1098 struct ext4_es_tree i_es_tree; 1099 rwlock_t i_es_lock; 1100 struct list_head i_es_list; 1101 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1102 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1103 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1104 extents to shrink. Protected by 1105 i_es_lock */ 1106 1107 /* ialloc */ 1108 ext4_group_t i_last_alloc_group; 1109 1110 /* allocation reservation info for delalloc */ 1111 /* In case of bigalloc, this refer to clusters rather than blocks */ 1112 unsigned int i_reserved_data_blocks; 1113 1114 /* pending cluster reservations for bigalloc file systems */ 1115 struct ext4_pending_tree i_pending_tree; 1116 1117 /* on-disk additional length */ 1118 __u16 i_extra_isize; 1119 1120 /* Indicate the inline data space. */ 1121 u16 i_inline_off; 1122 u16 i_inline_size; 1123 1124#ifdef CONFIG_QUOTA 1125 /* quota space reservation, managed internally by quota code */ 1126 qsize_t i_reserved_quota; 1127#endif 1128 1129 /* Lock protecting lists below */ 1130 spinlock_t i_completed_io_lock; 1131 /* 1132 * Completed IOs that need unwritten extents handling and have 1133 * transaction reserved 1134 */ 1135 struct list_head i_rsv_conversion_list; 1136 struct work_struct i_rsv_conversion_work; 1137 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1138 1139 spinlock_t i_block_reservation_lock; 1140 1141 /* 1142 * Transactions that contain inode's metadata needed to complete 1143 * fsync and fdatasync, respectively. 1144 */ 1145 tid_t i_sync_tid; 1146 tid_t i_datasync_tid; 1147 1148#ifdef CONFIG_QUOTA 1149 struct dquot __rcu *i_dquot[MAXQUOTAS]; 1150#endif 1151 1152 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1153 __u32 i_csum_seed; 1154 1155 kprojid_t i_projid; 1156}; 1157 1158/* 1159 * File system states 1160 */ 1161#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1162#define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1163#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1164#define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1165 1166/* 1167 * Misc. filesystem flags 1168 */ 1169#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1170#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1171#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1172 1173/* 1174 * Mount flags set via mount options or defaults 1175 */ 1176#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1177#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1178#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1179#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1180#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1181#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1182#define EXT4_MOUNT_ERRORS_MASK 0x00070 1183#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1184#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1185#ifdef CONFIG_FS_DAX 1186#define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1187#else 1188#define EXT4_MOUNT_DAX_ALWAYS 0 1189#endif 1190#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1191#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1192#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1193#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1194#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1195#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1196#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1197#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1198#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1199#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1200#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1201#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1202 * enable enforcement for hidden 1203 * quota files */ 1204#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1205 * enforcement for hidden quota 1206 * files */ 1207#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1208 * enforcement */ 1209#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1210#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1211#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1212#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1213#define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1214#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1215#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1216#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1217#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1218#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1219 1220/* 1221 * Mount flags set either automatically (could not be set by mount option) 1222 * based on per file system feature or property or in special cases such as 1223 * distinguishing between explicit mount option definition and default. 1224 */ 1225#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1226 specified delalloc */ 1227#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1228 size of blocksize * 8 1229 blocks */ 1230#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1231 file systems */ 1232#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1233 specified journal checksum */ 1234 1235#define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1236#define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1237#define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1238#define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1239 * scanning in mballoc 1240 */ 1241#define EXT4_MOUNT2_ABORT 0x00000100 /* Abort filesystem */ 1242 1243#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1244 ~EXT4_MOUNT_##opt 1245#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1246 EXT4_MOUNT_##opt 1247#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1248 EXT4_MOUNT_##opt) 1249 1250#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1251 ~EXT4_MOUNT2_##opt 1252#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1253 EXT4_MOUNT2_##opt 1254#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1255 EXT4_MOUNT2_##opt) 1256 1257#define ext4_test_and_set_bit __test_and_set_bit_le 1258#define ext4_set_bit __set_bit_le 1259#define ext4_test_and_clear_bit __test_and_clear_bit_le 1260#define ext4_clear_bit __clear_bit_le 1261#define ext4_test_bit test_bit_le 1262#define ext4_find_next_zero_bit find_next_zero_bit_le 1263#define ext4_find_next_bit find_next_bit_le 1264 1265extern void mb_set_bits(void *bm, int cur, int len); 1266 1267/* 1268 * Maximal mount counts between two filesystem checks 1269 */ 1270#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1271#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1272 1273/* 1274 * Behaviour when detecting errors 1275 */ 1276#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1277#define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1278#define EXT4_ERRORS_PANIC 3 /* Panic */ 1279#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1280 1281/* Metadata checksum algorithm codes */ 1282#define EXT4_CRC32C_CHKSUM 1 1283 1284#define EXT4_LABEL_MAX 16 1285 1286/* 1287 * Structure of the super block 1288 */ 1289struct ext4_super_block { 1290/*00*/ __le32 s_inodes_count; /* Inodes count */ 1291 __le32 s_blocks_count_lo; /* Blocks count */ 1292 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1293 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1294/*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1295 __le32 s_first_data_block; /* First Data Block */ 1296 __le32 s_log_block_size; /* Block size */ 1297 __le32 s_log_cluster_size; /* Allocation cluster size */ 1298/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1299 __le32 s_clusters_per_group; /* # Clusters per group */ 1300 __le32 s_inodes_per_group; /* # Inodes per group */ 1301 __le32 s_mtime; /* Mount time */ 1302/*30*/ __le32 s_wtime; /* Write time */ 1303 __le16 s_mnt_count; /* Mount count */ 1304 __le16 s_max_mnt_count; /* Maximal mount count */ 1305 __le16 s_magic; /* Magic signature */ 1306 __le16 s_state; /* File system state */ 1307 __le16 s_errors; /* Behaviour when detecting errors */ 1308 __le16 s_minor_rev_level; /* minor revision level */ 1309/*40*/ __le32 s_lastcheck; /* time of last check */ 1310 __le32 s_checkinterval; /* max. time between checks */ 1311 __le32 s_creator_os; /* OS */ 1312 __le32 s_rev_level; /* Revision level */ 1313/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1314 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1315 /* 1316 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1317 * 1318 * Note: the difference between the compatible feature set and 1319 * the incompatible feature set is that if there is a bit set 1320 * in the incompatible feature set that the kernel doesn't 1321 * know about, it should refuse to mount the filesystem. 1322 * 1323 * e2fsck's requirements are more strict; if it doesn't know 1324 * about a feature in either the compatible or incompatible 1325 * feature set, it must abort and not try to meddle with 1326 * things it doesn't understand... 1327 */ 1328 __le32 s_first_ino; /* First non-reserved inode */ 1329 __le16 s_inode_size; /* size of inode structure */ 1330 __le16 s_block_group_nr; /* block group # of this superblock */ 1331 __le32 s_feature_compat; /* compatible feature set */ 1332/*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1333 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1334/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1335/*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */ 1336/*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1337/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1338 /* 1339 * Performance hints. Directory preallocation should only 1340 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1341 */ 1342 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1343 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1344 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1345 /* 1346 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1347 */ 1348/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1349/*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1350 __le32 s_journal_dev; /* device number of journal file */ 1351 __le32 s_last_orphan; /* start of list of inodes to delete */ 1352 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1353 __u8 s_def_hash_version; /* Default hash version to use */ 1354 __u8 s_jnl_backup_type; 1355 __le16 s_desc_size; /* size of group descriptor */ 1356/*100*/ __le32 s_default_mount_opts; 1357 __le32 s_first_meta_bg; /* First metablock block group */ 1358 __le32 s_mkfs_time; /* When the filesystem was created */ 1359 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1360 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */ 1361/*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1362 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1363 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1364 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1365 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1366 __le32 s_flags; /* Miscellaneous flags */ 1367 __le16 s_raid_stride; /* RAID stride */ 1368 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1369 __le64 s_mmp_block; /* Block for multi-mount protection */ 1370 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1371 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1372 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1373 __u8 s_encryption_level; /* versioning level for encryption */ 1374 __u8 s_reserved_pad; /* Padding to next 32bits */ 1375 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1376 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1377 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1378 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1379 snapshot's future use */ 1380 __le32 s_snapshot_list; /* inode number of the head of the 1381 on-disk snapshot list */ 1382#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1383 __le32 s_error_count; /* number of fs errors */ 1384 __le32 s_first_error_time; /* first time an error happened */ 1385 __le32 s_first_error_ino; /* inode involved in first error */ 1386 __le64 s_first_error_block; /* block involved of first error */ 1387 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1388 __le32 s_first_error_line; /* line number where error happened */ 1389 __le32 s_last_error_time; /* most recent time of an error */ 1390 __le32 s_last_error_ino; /* inode involved in last error */ 1391 __le32 s_last_error_line; /* line number where error happened */ 1392 __le64 s_last_error_block; /* block involved of last error */ 1393 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1394#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1395 __u8 s_mount_opts[64]; 1396 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1397 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1398 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1399 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1400 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1401 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1402 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1403 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1404 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1405 __u8 s_wtime_hi; 1406 __u8 s_mtime_hi; 1407 __u8 s_mkfs_time_hi; 1408 __u8 s_lastcheck_hi; 1409 __u8 s_first_error_time_hi; 1410 __u8 s_last_error_time_hi; 1411 __u8 s_first_error_errcode; 1412 __u8 s_last_error_errcode; 1413 __le16 s_encoding; /* Filename charset encoding */ 1414 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1415 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ 1416 __le32 s_reserved[94]; /* Padding to the end of the block */ 1417 __le32 s_checksum; /* crc32c(superblock) */ 1418}; 1419 1420#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1421 1422#ifdef __KERNEL__ 1423 1424/* Number of quota types we support */ 1425#define EXT4_MAXQUOTAS 3 1426 1427#define EXT4_ENC_UTF8_12_1 1 1428 1429/* Types of ext4 journal triggers */ 1430enum ext4_journal_trigger_type { 1431 EXT4_JTR_ORPHAN_FILE, 1432 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ 1433}; 1434 1435#define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE 1436 1437struct ext4_journal_trigger { 1438 struct jbd2_buffer_trigger_type tr_triggers; 1439 struct super_block *sb; 1440}; 1441 1442static inline struct ext4_journal_trigger *EXT4_TRIGGER( 1443 struct jbd2_buffer_trigger_type *trigger) 1444{ 1445 return container_of(trigger, struct ext4_journal_trigger, tr_triggers); 1446} 1447 1448#define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 1449 1450/* Structure at the tail of orphan block */ 1451struct ext4_orphan_block_tail { 1452 __le32 ob_magic; 1453 __le32 ob_checksum; 1454}; 1455 1456static inline int ext4_inodes_per_orphan_block(struct super_block *sb) 1457{ 1458 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / 1459 sizeof(u32); 1460} 1461 1462struct ext4_orphan_block { 1463 atomic_t ob_free_entries; /* Number of free orphan entries in block */ 1464 struct buffer_head *ob_bh; /* Buffer for orphan block */ 1465}; 1466 1467/* 1468 * Info about orphan file. 1469 */ 1470struct ext4_orphan_info { 1471 int of_blocks; /* Number of orphan blocks in a file */ 1472 __u32 of_csum_seed; /* Checksum seed for orphan file */ 1473 struct ext4_orphan_block *of_binfo; /* Array with info about orphan 1474 * file blocks */ 1475}; 1476 1477/* 1478 * fourth extended-fs super-block data in memory 1479 */ 1480struct ext4_sb_info { 1481 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1482 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1483 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1484 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1485 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1486 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1487 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1488 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1489 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1490 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1491 unsigned long s_overhead; /* # of fs overhead clusters */ 1492 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1493 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1494 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1495 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1496 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1497 struct buffer_head * __rcu *s_group_desc; 1498 unsigned int s_mount_opt; 1499 unsigned int s_mount_opt2; 1500 unsigned long s_mount_flags; 1501 unsigned int s_def_mount_opt; 1502 unsigned int s_def_mount_opt2; 1503 ext4_fsblk_t s_sb_block; 1504 atomic64_t s_resv_clusters; 1505 kuid_t s_resuid; 1506 kgid_t s_resgid; 1507 unsigned short s_mount_state; 1508 unsigned short s_pad; 1509 int s_addr_per_block_bits; 1510 int s_desc_per_block_bits; 1511 int s_inode_size; 1512 int s_first_ino; 1513 unsigned int s_inode_readahead_blks; 1514 unsigned int s_inode_goal; 1515 u32 s_hash_seed[4]; 1516 int s_def_hash_version; 1517 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1518 struct percpu_counter s_freeclusters_counter; 1519 struct percpu_counter s_freeinodes_counter; 1520 struct percpu_counter s_dirs_counter; 1521 struct percpu_counter s_dirtyclusters_counter; 1522 struct percpu_counter s_sra_exceeded_retry_limit; 1523 struct blockgroup_lock *s_blockgroup_lock; 1524 struct proc_dir_entry *s_proc; 1525 struct kobject s_kobj; 1526 struct completion s_kobj_unregister; 1527 struct super_block *s_sb; 1528 struct buffer_head *s_mmp_bh; 1529 1530 /* Journaling */ 1531 struct journal_s *s_journal; 1532 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1533 struct mutex s_orphan_lock; /* Protects on disk list changes */ 1534 struct list_head s_orphan; /* List of orphaned inodes in on disk 1535 list */ 1536 struct ext4_orphan_info s_orphan_info; 1537 unsigned long s_commit_interval; 1538 u32 s_max_batch_time; 1539 u32 s_min_batch_time; 1540 struct block_device *s_journal_bdev; 1541#ifdef CONFIG_QUOTA 1542 /* Names of quota files with journalled quota */ 1543 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1544 int s_jquota_fmt; /* Format of quota to use */ 1545#endif 1546 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1547 struct ext4_system_blocks __rcu *s_system_blks; 1548 1549#ifdef EXTENTS_STATS 1550 /* ext4 extents stats */ 1551 unsigned long s_ext_min; 1552 unsigned long s_ext_max; 1553 unsigned long s_depth_max; 1554 spinlock_t s_ext_stats_lock; 1555 unsigned long s_ext_blocks; 1556 unsigned long s_ext_extents; 1557#endif 1558 1559 /* for buddy allocator */ 1560 struct ext4_group_info ** __rcu *s_group_info; 1561 struct inode *s_buddy_cache; 1562 spinlock_t s_md_lock; 1563 unsigned short *s_mb_offsets; 1564 unsigned int *s_mb_maxs; 1565 unsigned int s_group_info_size; 1566 unsigned int s_mb_free_pending; 1567 struct list_head s_freed_data_list; /* List of blocks to be freed 1568 after commit completed */ 1569 struct list_head s_discard_list; 1570 struct work_struct s_discard_work; 1571 atomic_t s_retry_alloc_pending; 1572 struct list_head *s_mb_avg_fragment_size; 1573 rwlock_t *s_mb_avg_fragment_size_locks; 1574 struct list_head *s_mb_largest_free_orders; 1575 rwlock_t *s_mb_largest_free_orders_locks; 1576 1577 /* tunables */ 1578 unsigned long s_stripe; 1579 unsigned int s_mb_max_linear_groups; 1580 unsigned int s_mb_stream_request; 1581 unsigned int s_mb_max_to_scan; 1582 unsigned int s_mb_min_to_scan; 1583 unsigned int s_mb_stats; 1584 unsigned int s_mb_order2_reqs; 1585 unsigned int s_mb_group_prealloc; 1586 unsigned int s_max_dir_size_kb; 1587 /* where last allocation was done - for stream allocation */ 1588 unsigned long s_mb_last_group; 1589 unsigned long s_mb_last_start; 1590 unsigned int s_mb_prefetch; 1591 unsigned int s_mb_prefetch_limit; 1592 unsigned int s_mb_best_avail_max_trim_order; 1593 1594 /* stats for buddy allocator */ 1595 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1596 atomic_t s_bal_success; /* we found long enough chunks */ 1597 atomic_t s_bal_allocated; /* in blocks */ 1598 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1599 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */ 1600 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1601 atomic_t s_bal_goals; /* goal hits */ 1602 atomic_t s_bal_len_goals; /* len goal hits */ 1603 atomic_t s_bal_breaks; /* too long searches */ 1604 atomic_t s_bal_2orders; /* 2^order hits */ 1605 atomic_t s_bal_p2_aligned_bad_suggestions; 1606 atomic_t s_bal_goal_fast_bad_suggestions; 1607 atomic_t s_bal_best_avail_bad_suggestions; 1608 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS]; 1609 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS]; 1610 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */ 1611 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1612 atomic64_t s_mb_generation_time; 1613 atomic_t s_mb_lost_chunks; 1614 atomic_t s_mb_preallocated; 1615 atomic_t s_mb_discarded; 1616 atomic_t s_lock_busy; 1617 1618 /* locality groups */ 1619 struct ext4_locality_group __percpu *s_locality_groups; 1620 1621 /* for write statistics */ 1622 unsigned long s_sectors_written_start; 1623 u64 s_kbytes_written; 1624 1625 /* the size of zero-out chunk */ 1626 unsigned int s_extent_max_zeroout_kb; 1627 1628 unsigned int s_log_groups_per_flex; 1629 struct flex_groups * __rcu *s_flex_groups; 1630 ext4_group_t s_flex_groups_allocated; 1631 1632 /* workqueue for reserved extent conversions (buffered io) */ 1633 struct workqueue_struct *rsv_conversion_wq; 1634 1635 /* timer for periodic error stats printing */ 1636 struct timer_list s_err_report; 1637 1638 /* Lazy inode table initialization info */ 1639 struct ext4_li_request *s_li_request; 1640 /* Wait multiplier for lazy initialization thread */ 1641 unsigned int s_li_wait_mult; 1642 1643 /* Kernel thread for multiple mount protection */ 1644 struct task_struct *s_mmp_tsk; 1645 1646 /* record the last minlen when FITRIM is called. */ 1647 unsigned long s_last_trim_minblks; 1648 1649 /* Reference to checksum algorithm driver via cryptoapi */ 1650 struct crypto_shash *s_chksum_driver; 1651 1652 /* Precomputed FS UUID checksum for seeding other checksums */ 1653 __u32 s_csum_seed; 1654 1655 /* Reclaim extents from extent status tree */ 1656 struct shrinker s_es_shrinker; 1657 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1658 long s_es_nr_inode; 1659 struct ext4_es_stats s_es_stats; 1660 struct mb_cache *s_ea_block_cache; 1661 struct mb_cache *s_ea_inode_cache; 1662 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1663 1664 /* Journal triggers for checksum computation */ 1665 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; 1666 1667 /* Ratelimit ext4 messages. */ 1668 struct ratelimit_state s_err_ratelimit_state; 1669 struct ratelimit_state s_warning_ratelimit_state; 1670 struct ratelimit_state s_msg_ratelimit_state; 1671 atomic_t s_warning_count; 1672 atomic_t s_msg_count; 1673 1674 /* Encryption policy for '-o test_dummy_encryption' */ 1675 struct fscrypt_dummy_policy s_dummy_enc_policy; 1676 1677 /* 1678 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1679 * or EXTENTS flag or between writepages ops and changing DELALLOC or 1680 * DIOREAD_NOLOCK mount options on remount. 1681 */ 1682 struct percpu_rw_semaphore s_writepages_rwsem; 1683 struct dax_device *s_daxdev; 1684 u64 s_dax_part_off; 1685#ifdef CONFIG_EXT4_DEBUG 1686 unsigned long s_simulate_fail; 1687#endif 1688 /* Record the errseq of the backing block device */ 1689 errseq_t s_bdev_wb_err; 1690 spinlock_t s_bdev_wb_lock; 1691 1692 /* Information about errors that happened during this mount */ 1693 spinlock_t s_error_lock; 1694 int s_add_error_count; 1695 int s_first_error_code; 1696 __u32 s_first_error_line; 1697 __u32 s_first_error_ino; 1698 __u64 s_first_error_block; 1699 const char *s_first_error_func; 1700 time64_t s_first_error_time; 1701 int s_last_error_code; 1702 __u32 s_last_error_line; 1703 __u32 s_last_error_ino; 1704 __u64 s_last_error_block; 1705 const char *s_last_error_func; 1706 time64_t s_last_error_time; 1707 /* 1708 * If we are in a context where we cannot update the on-disk 1709 * superblock, we queue the work here. This is used to update 1710 * the error information in the superblock, and for periodic 1711 * updates of the superblock called from the commit callback 1712 * function. 1713 */ 1714 struct work_struct s_sb_upd_work; 1715 1716 /* Ext4 fast commit sub transaction ID */ 1717 atomic_t s_fc_subtid; 1718 1719 /* 1720 * After commit starts, the main queue gets locked, and the further 1721 * updates get added in the staging queue. 1722 */ 1723#define FC_Q_MAIN 0 1724#define FC_Q_STAGING 1 1725 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1726 * that have data changes in them. 1727 */ 1728 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1729 unsigned int s_fc_bytes; 1730 /* 1731 * Main fast commit lock. This lock protects accesses to the 1732 * following fields: 1733 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1734 */ 1735 spinlock_t s_fc_lock; 1736 struct buffer_head *s_fc_bh; 1737 struct ext4_fc_stats s_fc_stats; 1738 tid_t s_fc_ineligible_tid; 1739#ifdef CONFIG_EXT4_DEBUG 1740 int s_fc_debug_max_replay; 1741#endif 1742 struct ext4_fc_replay_state s_fc_replay_state; 1743}; 1744 1745static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1746{ 1747 return sb->s_fs_info; 1748} 1749static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1750{ 1751 return container_of(inode, struct ext4_inode_info, vfs_inode); 1752} 1753 1754static inline int ext4_writepages_down_read(struct super_block *sb) 1755{ 1756 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem); 1757 return memalloc_nofs_save(); 1758} 1759 1760static inline void ext4_writepages_up_read(struct super_block *sb, int ctx) 1761{ 1762 memalloc_nofs_restore(ctx); 1763 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem); 1764} 1765 1766static inline int ext4_writepages_down_write(struct super_block *sb) 1767{ 1768 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem); 1769 return memalloc_nofs_save(); 1770} 1771 1772static inline void ext4_writepages_up_write(struct super_block *sb, int ctx) 1773{ 1774 memalloc_nofs_restore(ctx); 1775 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem); 1776} 1777 1778static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1779{ 1780 return ino == EXT4_ROOT_INO || 1781 (ino >= EXT4_FIRST_INO(sb) && 1782 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1783} 1784 1785/* 1786 * Returns: sbi->field[index] 1787 * Used to access an array element from the following sbi fields which require 1788 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1789 * - s_group_desc 1790 * - s_group_info 1791 * - s_flex_group 1792 */ 1793#define sbi_array_rcu_deref(sbi, field, index) \ 1794({ \ 1795 typeof(*((sbi)->field)) _v; \ 1796 rcu_read_lock(); \ 1797 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1798 rcu_read_unlock(); \ 1799 _v; \ 1800}) 1801 1802/* 1803 * run-time mount flags 1804 */ 1805enum { 1806 EXT4_MF_MNTDIR_SAMPLED, 1807 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */ 1808}; 1809 1810static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1811{ 1812 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1813} 1814 1815static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1816{ 1817 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1818} 1819 1820static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1821{ 1822 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1823} 1824 1825 1826/* 1827 * Simulate_fail codes 1828 */ 1829#define EXT4_SIM_BBITMAP_EIO 1 1830#define EXT4_SIM_BBITMAP_CRC 2 1831#define EXT4_SIM_IBITMAP_EIO 3 1832#define EXT4_SIM_IBITMAP_CRC 4 1833#define EXT4_SIM_INODE_EIO 5 1834#define EXT4_SIM_INODE_CRC 6 1835#define EXT4_SIM_DIRBLOCK_EIO 7 1836#define EXT4_SIM_DIRBLOCK_CRC 8 1837 1838static inline bool ext4_simulate_fail(struct super_block *sb, 1839 unsigned long code) 1840{ 1841#ifdef CONFIG_EXT4_DEBUG 1842 struct ext4_sb_info *sbi = EXT4_SB(sb); 1843 1844 if (unlikely(sbi->s_simulate_fail == code)) { 1845 sbi->s_simulate_fail = 0; 1846 return true; 1847 } 1848#endif 1849 return false; 1850} 1851 1852static inline void ext4_simulate_fail_bh(struct super_block *sb, 1853 struct buffer_head *bh, 1854 unsigned long code) 1855{ 1856 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1857 clear_buffer_uptodate(bh); 1858} 1859 1860/* 1861 * Error number codes for s_{first,last}_error_errno 1862 * 1863 * Linux errno numbers are architecture specific, so we need to translate 1864 * them into something which is architecture independent. We don't define 1865 * codes for all errno's; just the ones which are most likely to be the cause 1866 * of an ext4_error() call. 1867 */ 1868#define EXT4_ERR_UNKNOWN 1 1869#define EXT4_ERR_EIO 2 1870#define EXT4_ERR_ENOMEM 3 1871#define EXT4_ERR_EFSBADCRC 4 1872#define EXT4_ERR_EFSCORRUPTED 5 1873#define EXT4_ERR_ENOSPC 6 1874#define EXT4_ERR_ENOKEY 7 1875#define EXT4_ERR_EROFS 8 1876#define EXT4_ERR_EFBIG 9 1877#define EXT4_ERR_EEXIST 10 1878#define EXT4_ERR_ERANGE 11 1879#define EXT4_ERR_EOVERFLOW 12 1880#define EXT4_ERR_EBUSY 13 1881#define EXT4_ERR_ENOTDIR 14 1882#define EXT4_ERR_ENOTEMPTY 15 1883#define EXT4_ERR_ESHUTDOWN 16 1884#define EXT4_ERR_EFAULT 17 1885 1886/* 1887 * Inode dynamic state flags 1888 */ 1889enum { 1890 EXT4_STATE_NEW, /* inode is newly created */ 1891 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1892 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1893 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1894 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1895 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1896 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1897 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1898 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1899 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1900 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1901 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ 1902}; 1903 1904#define EXT4_INODE_BIT_FNS(name, field, offset) \ 1905static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1906{ \ 1907 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1908} \ 1909static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1910{ \ 1911 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1912} \ 1913static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1914{ \ 1915 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1916} 1917 1918/* Add these declarations here only so that these functions can be 1919 * found by name. Otherwise, they are very hard to locate. */ 1920static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1921static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1922static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1923EXT4_INODE_BIT_FNS(flag, flags, 0) 1924 1925/* Add these declarations here only so that these functions can be 1926 * found by name. Otherwise, they are very hard to locate. */ 1927static inline int ext4_test_inode_state(struct inode *inode, int bit); 1928static inline void ext4_set_inode_state(struct inode *inode, int bit); 1929static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1930#if (BITS_PER_LONG < 64) 1931EXT4_INODE_BIT_FNS(state, state_flags, 0) 1932 1933static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1934{ 1935 (ei)->i_state_flags = 0; 1936} 1937#else 1938EXT4_INODE_BIT_FNS(state, flags, 32) 1939 1940static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1941{ 1942 /* We depend on the fact that callers will set i_flags */ 1943} 1944#endif 1945#else 1946/* Assume that user mode programs are passing in an ext4fs superblock, not 1947 * a kernel struct super_block. This will allow us to call the feature-test 1948 * macros from user land. */ 1949#define EXT4_SB(sb) (sb) 1950#endif 1951 1952static inline bool ext4_verity_in_progress(struct inode *inode) 1953{ 1954 return IS_ENABLED(CONFIG_FS_VERITY) && 1955 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1956} 1957 1958#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1959 1960/* 1961 * Codes for operating systems 1962 */ 1963#define EXT4_OS_LINUX 0 1964#define EXT4_OS_HURD 1 1965#define EXT4_OS_MASIX 2 1966#define EXT4_OS_FREEBSD 3 1967#define EXT4_OS_LITES 4 1968 1969/* 1970 * Revision levels 1971 */ 1972#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1973#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1974 1975#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1976 1977#define EXT4_GOOD_OLD_INODE_SIZE 128 1978 1979#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1980#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1981#define EXT4_TIMESTAMP_MIN S32_MIN 1982 1983/* 1984 * Feature set definitions 1985 */ 1986 1987#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1988#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1989#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1990#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1991#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1992#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1993#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1994/* 1995 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1996 * incompatible only if fast commit blocks are present in the FS. Since we 1997 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1998 * incompatible. We also have a JBD2 incompat feature, which gets set when 1999 * there are fast commit blocks present in the journal. 2000 */ 2001#define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 2002#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 2003#define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ 2004 2005#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 2006#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 2007#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 2008#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 2009#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 2010#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 2011#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 2012#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 2013#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 2014/* 2015 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 2016 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 2017 * all other data structures' checksums. However, the METADATA_CSUM and 2018 * GDT_CSUM bits are mutually exclusive. 2019 */ 2020#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 2021#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 2022#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 2023#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 2024#define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be 2025 non-empty */ 2026 2027#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 2028#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 2029#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 2030#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 2031#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 2032#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 2033#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 2034#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 2035#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 2036#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 2037#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 2038#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 2039#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 2040#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 2041#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 2042#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 2043 2044extern void ext4_update_dynamic_rev(struct super_block *sb); 2045 2046#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 2047static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2048{ \ 2049 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2050 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 2051} \ 2052static inline void ext4_set_feature_##name(struct super_block *sb) \ 2053{ \ 2054 ext4_update_dynamic_rev(sb); \ 2055 EXT4_SB(sb)->s_es->s_feature_compat |= \ 2056 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2057} \ 2058static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2059{ \ 2060 EXT4_SB(sb)->s_es->s_feature_compat &= \ 2061 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2062} 2063 2064#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2065static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2066{ \ 2067 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2068 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2069} \ 2070static inline void ext4_set_feature_##name(struct super_block *sb) \ 2071{ \ 2072 ext4_update_dynamic_rev(sb); \ 2073 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2074 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2075} \ 2076static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2077{ \ 2078 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2079 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2080} 2081 2082#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2083static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2084{ \ 2085 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2086 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2087} \ 2088static inline void ext4_set_feature_##name(struct super_block *sb) \ 2089{ \ 2090 ext4_update_dynamic_rev(sb); \ 2091 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2092 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2093} \ 2094static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2095{ \ 2096 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2097 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2098} 2099 2100EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2101EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2102EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2103EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2104EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2105EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2106EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2107EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2108EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2109EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) 2110 2111EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2112EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2113EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2114EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2115EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2116EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2117EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2118EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2119EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2120EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2121EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2122EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2123EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2124EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) 2125 2126EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2127EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2128EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2129EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2130EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2131EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2132EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2133EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2134EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2135EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2136EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2137EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2138EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2139EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2140EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2141EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2142 2143#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2144#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2145 EXT4_FEATURE_INCOMPAT_META_BG) 2146#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2147 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2148 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2149 2150#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2151#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2152 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2153 EXT4_FEATURE_INCOMPAT_META_BG) 2154#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2155 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2156 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2157 2158#define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ 2159 EXT4_FEATURE_COMPAT_ORPHAN_FILE) 2160#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2161 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2162 EXT4_FEATURE_INCOMPAT_META_BG| \ 2163 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2164 EXT4_FEATURE_INCOMPAT_64BIT| \ 2165 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2166 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2167 EXT4_FEATURE_INCOMPAT_MMP | \ 2168 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2169 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2170 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2171 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2172 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2173#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2174 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2175 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2176 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2177 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2178 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2179 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2180 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2181 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2182 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2183 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2184 EXT4_FEATURE_RO_COMPAT_VERITY |\ 2185 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) 2186 2187#define EXTN_FEATURE_FUNCS(ver) \ 2188static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2189{ \ 2190 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2191 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2192} \ 2193static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2194{ \ 2195 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2196 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2197} \ 2198static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2199{ \ 2200 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2201 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2202} 2203 2204EXTN_FEATURE_FUNCS(2) 2205EXTN_FEATURE_FUNCS(3) 2206EXTN_FEATURE_FUNCS(4) 2207 2208static inline bool ext4_has_compat_features(struct super_block *sb) 2209{ 2210 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2211} 2212static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2213{ 2214 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2215} 2216static inline bool ext4_has_incompat_features(struct super_block *sb) 2217{ 2218 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2219} 2220 2221extern int ext4_feature_set_ok(struct super_block *sb, int readonly); 2222 2223/* 2224 * Superblock flags 2225 */ 2226#define EXT4_FLAGS_RESIZING 0 2227#define EXT4_FLAGS_SHUTDOWN 1 2228#define EXT4_FLAGS_BDEV_IS_DAX 2 2229 2230static inline int ext4_forced_shutdown(struct super_block *sb) 2231{ 2232 return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags); 2233} 2234 2235/* 2236 * Default values for user and/or group using reserved blocks 2237 */ 2238#define EXT4_DEF_RESUID 0 2239#define EXT4_DEF_RESGID 0 2240 2241/* 2242 * Default project ID 2243 */ 2244#define EXT4_DEF_PROJID 0 2245 2246#define EXT4_DEF_INODE_READAHEAD_BLKS 32 2247 2248/* 2249 * Default mount options 2250 */ 2251#define EXT4_DEFM_DEBUG 0x0001 2252#define EXT4_DEFM_BSDGROUPS 0x0002 2253#define EXT4_DEFM_XATTR_USER 0x0004 2254#define EXT4_DEFM_ACL 0x0008 2255#define EXT4_DEFM_UID16 0x0010 2256#define EXT4_DEFM_JMODE 0x0060 2257#define EXT4_DEFM_JMODE_DATA 0x0020 2258#define EXT4_DEFM_JMODE_ORDERED 0x0040 2259#define EXT4_DEFM_JMODE_WBACK 0x0060 2260#define EXT4_DEFM_NOBARRIER 0x0100 2261#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2262#define EXT4_DEFM_DISCARD 0x0400 2263#define EXT4_DEFM_NODELALLOC 0x0800 2264 2265/* 2266 * Default journal batch times 2267 */ 2268#define EXT4_DEF_MIN_BATCH_TIME 0 2269#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2270 2271/* 2272 * Minimum number of groups in a flexgroup before we separate out 2273 * directories into the first block group of a flexgroup 2274 */ 2275#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2276 2277/* 2278 * Structure of a directory entry 2279 */ 2280#define EXT4_NAME_LEN 255 2281/* 2282 * Base length of the ext4 directory entry excluding the name length 2283 */ 2284#define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) 2285 2286struct ext4_dir_entry { 2287 __le32 inode; /* Inode number */ 2288 __le16 rec_len; /* Directory entry length */ 2289 __le16 name_len; /* Name length */ 2290 char name[EXT4_NAME_LEN]; /* File name */ 2291}; 2292 2293 2294/* 2295 * Encrypted Casefolded entries require saving the hash on disk. This structure 2296 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2297 * boundary. 2298 */ 2299struct ext4_dir_entry_hash { 2300 __le32 hash; 2301 __le32 minor_hash; 2302}; 2303 2304/* 2305 * The new version of the directory entry. Since EXT4 structures are 2306 * stored in intel byte order, and the name_len field could never be 2307 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2308 * file_type field. 2309 */ 2310struct ext4_dir_entry_2 { 2311 __le32 inode; /* Inode number */ 2312 __le16 rec_len; /* Directory entry length */ 2313 __u8 name_len; /* Name length */ 2314 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2315 char name[EXT4_NAME_LEN]; /* File name */ 2316}; 2317 2318/* 2319 * Access the hashes at the end of ext4_dir_entry_2 2320 */ 2321#define EXT4_DIRENT_HASHES(entry) \ 2322 ((struct ext4_dir_entry_hash *) \ 2323 (((void *)(entry)) + \ 2324 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2325#define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) 2326#define EXT4_DIRENT_MINOR_HASH(entry) \ 2327 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) 2328 2329static inline bool ext4_hash_in_dirent(const struct inode *inode) 2330{ 2331 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2332} 2333 2334/* 2335 * This is a bogus directory entry at the end of each leaf block that 2336 * records checksums. 2337 */ 2338struct ext4_dir_entry_tail { 2339 __le32 det_reserved_zero1; /* Pretend to be unused */ 2340 __le16 det_rec_len; /* 12 */ 2341 __u8 det_reserved_zero2; /* Zero name length */ 2342 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2343 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2344}; 2345 2346#define EXT4_DIRENT_TAIL(block, blocksize) \ 2347 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2348 ((blocksize) - \ 2349 sizeof(struct ext4_dir_entry_tail)))) 2350 2351/* 2352 * Ext4 directory file types. Only the low 3 bits are used. The 2353 * other bits are reserved for now. 2354 */ 2355#define EXT4_FT_UNKNOWN 0 2356#define EXT4_FT_REG_FILE 1 2357#define EXT4_FT_DIR 2 2358#define EXT4_FT_CHRDEV 3 2359#define EXT4_FT_BLKDEV 4 2360#define EXT4_FT_FIFO 5 2361#define EXT4_FT_SOCK 6 2362#define EXT4_FT_SYMLINK 7 2363 2364#define EXT4_FT_MAX 8 2365 2366#define EXT4_FT_DIR_CSUM 0xDE 2367 2368/* 2369 * EXT4_DIR_PAD defines the directory entries boundaries 2370 * 2371 * NOTE: It must be a multiple of 4 2372 */ 2373#define EXT4_DIR_PAD 4 2374#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2375#define EXT4_MAX_REC_LEN ((1<<16)-1) 2376 2377/* 2378 * The rec_len is dependent on the type of directory. Directories that are 2379 * casefolded and encrypted need to store the hash as well, so we add room for 2380 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2381 * pass NULL for dir, as those entries do not use the extra fields. 2382 */ 2383static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2384 const struct inode *dir) 2385{ 2386 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2387 2388 if (dir && ext4_hash_in_dirent(dir)) 2389 rec_len += sizeof(struct ext4_dir_entry_hash); 2390 return (rec_len & ~EXT4_DIR_ROUND); 2391} 2392 2393/* 2394 * If we ever get support for fs block sizes > page_size, we'll need 2395 * to remove the #if statements in the next two functions... 2396 */ 2397static inline unsigned int 2398ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2399{ 2400 unsigned len = le16_to_cpu(dlen); 2401 2402#if (PAGE_SIZE >= 65536) 2403 if (len == EXT4_MAX_REC_LEN || len == 0) 2404 return blocksize; 2405 return (len & 65532) | ((len & 3) << 16); 2406#else 2407 return len; 2408#endif 2409} 2410 2411static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2412{ 2413 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); 2414#if (PAGE_SIZE >= 65536) 2415 if (len < 65536) 2416 return cpu_to_le16(len); 2417 if (len == blocksize) { 2418 if (blocksize == 65536) 2419 return cpu_to_le16(EXT4_MAX_REC_LEN); 2420 else 2421 return cpu_to_le16(0); 2422 } 2423 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2424#else 2425 return cpu_to_le16(len); 2426#endif 2427} 2428 2429/* 2430 * Hash Tree Directory indexing 2431 * (c) Daniel Phillips, 2001 2432 */ 2433 2434#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2435 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2436#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2437 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2438#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2439 2440/* Legal values for the dx_root hash_version field: */ 2441 2442#define DX_HASH_LEGACY 0 2443#define DX_HASH_HALF_MD4 1 2444#define DX_HASH_TEA 2 2445#define DX_HASH_LEGACY_UNSIGNED 3 2446#define DX_HASH_HALF_MD4_UNSIGNED 4 2447#define DX_HASH_TEA_UNSIGNED 5 2448#define DX_HASH_SIPHASH 6 2449 2450static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2451 const void *address, unsigned int length) 2452{ 2453 struct { 2454 struct shash_desc shash; 2455 char ctx[4]; 2456 } desc; 2457 2458 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2459 2460 desc.shash.tfm = sbi->s_chksum_driver; 2461 *(u32 *)desc.ctx = crc; 2462 2463 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2464 2465 return *(u32 *)desc.ctx; 2466} 2467 2468#ifdef __KERNEL__ 2469 2470/* hash info structure used by the directory hash */ 2471struct dx_hash_info 2472{ 2473 u32 hash; 2474 u32 minor_hash; 2475 int hash_version; 2476 u32 *seed; 2477}; 2478 2479 2480/* 32 and 64 bit signed EOF for dx directories */ 2481#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2482#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2483 2484 2485/* 2486 * Control parameters used by ext4_htree_next_block 2487 */ 2488#define HASH_NB_ALWAYS 1 2489 2490struct ext4_filename { 2491 const struct qstr *usr_fname; 2492 struct fscrypt_str disk_name; 2493 struct dx_hash_info hinfo; 2494#ifdef CONFIG_FS_ENCRYPTION 2495 struct fscrypt_str crypto_buf; 2496#endif 2497#if IS_ENABLED(CONFIG_UNICODE) 2498 struct fscrypt_str cf_name; 2499#endif 2500}; 2501 2502#define fname_name(p) ((p)->disk_name.name) 2503#define fname_usr_name(p) ((p)->usr_fname->name) 2504#define fname_len(p) ((p)->disk_name.len) 2505 2506/* 2507 * Describe an inode's exact location on disk and in memory 2508 */ 2509struct ext4_iloc 2510{ 2511 struct buffer_head *bh; 2512 unsigned long offset; 2513 ext4_group_t block_group; 2514}; 2515 2516static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2517{ 2518 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2519} 2520 2521static inline bool ext4_is_quota_file(struct inode *inode) 2522{ 2523 return IS_NOQUOTA(inode) && 2524 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2525} 2526 2527/* 2528 * This structure is stuffed into the struct file's private_data field 2529 * for directories. It is where we put information so that we can do 2530 * readdir operations in hash tree order. 2531 */ 2532struct dir_private_info { 2533 struct rb_root root; 2534 struct rb_node *curr_node; 2535 struct fname *extra_fname; 2536 loff_t last_pos; 2537 __u32 curr_hash; 2538 __u32 curr_minor_hash; 2539 __u32 next_hash; 2540}; 2541 2542/* calculate the first block number of the group */ 2543static inline ext4_fsblk_t 2544ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2545{ 2546 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2547 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2548} 2549 2550/* 2551 * Special error return code only used by dx_probe() and its callers. 2552 */ 2553#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2554 2555/* htree levels for ext4 */ 2556#define EXT4_HTREE_LEVEL_COMPAT 2 2557#define EXT4_HTREE_LEVEL 3 2558 2559static inline int ext4_dir_htree_level(struct super_block *sb) 2560{ 2561 return ext4_has_feature_largedir(sb) ? 2562 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2563} 2564 2565/* 2566 * Timeout and state flag for lazy initialization inode thread. 2567 */ 2568#define EXT4_DEF_LI_WAIT_MULT 10 2569#define EXT4_DEF_LI_MAX_START_DELAY 5 2570#define EXT4_LAZYINIT_QUIT 0x0001 2571#define EXT4_LAZYINIT_RUNNING 0x0002 2572 2573/* 2574 * Lazy inode table initialization info 2575 */ 2576struct ext4_lazy_init { 2577 unsigned long li_state; 2578 struct list_head li_request_list; 2579 struct mutex li_list_mtx; 2580}; 2581 2582enum ext4_li_mode { 2583 EXT4_LI_MODE_PREFETCH_BBITMAP, 2584 EXT4_LI_MODE_ITABLE, 2585}; 2586 2587struct ext4_li_request { 2588 struct super_block *lr_super; 2589 enum ext4_li_mode lr_mode; 2590 ext4_group_t lr_first_not_zeroed; 2591 ext4_group_t lr_next_group; 2592 struct list_head lr_request; 2593 unsigned long lr_next_sched; 2594 unsigned long lr_timeout; 2595}; 2596 2597struct ext4_features { 2598 struct kobject f_kobj; 2599 struct completion f_kobj_unregister; 2600}; 2601 2602/* 2603 * This structure will be used for multiple mount protection. It will be 2604 * written into the block number saved in the s_mmp_block field in the 2605 * superblock. Programs that check MMP should assume that if 2606 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2607 * to use the filesystem, regardless of how old the timestamp is. 2608 */ 2609#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2610#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2611#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2612#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2613 2614struct mmp_struct { 2615 __le32 mmp_magic; /* Magic number for MMP */ 2616 __le32 mmp_seq; /* Sequence no. updated periodically */ 2617 2618 /* 2619 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2620 * purposes and do not affect the correctness of the algorithm 2621 */ 2622 __le64 mmp_time; /* Time last updated */ 2623 char mmp_nodename[64]; /* Node which last updated MMP block */ 2624 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2625 2626 /* 2627 * mmp_check_interval is used to verify if the MMP block has been 2628 * updated on the block device. The value is updated based on the 2629 * maximum time to write the MMP block during an update cycle. 2630 */ 2631 __le16 mmp_check_interval; 2632 2633 __le16 mmp_pad1; 2634 __le32 mmp_pad2[226]; 2635 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2636}; 2637 2638/* arguments passed to the mmp thread */ 2639struct mmpd_data { 2640 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2641 struct super_block *sb; /* super block of the fs */ 2642}; 2643 2644/* 2645 * Check interval multiplier 2646 * The MMP block is written every update interval and initially checked every 2647 * update interval x the multiplier (the value is then adapted based on the 2648 * write latency). The reason is that writes can be delayed under load and we 2649 * don't want readers to incorrectly assume that the filesystem is no longer 2650 * in use. 2651 */ 2652#define EXT4_MMP_CHECK_MULT 2UL 2653 2654/* 2655 * Minimum interval for MMP checking in seconds. 2656 */ 2657#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2658 2659/* 2660 * Maximum interval for MMP checking in seconds. 2661 */ 2662#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2663 2664/* 2665 * Function prototypes 2666 */ 2667 2668/* 2669 * Ok, these declarations are also in <linux/kernel.h> but none of the 2670 * ext4 source programs needs to include it so they are duplicated here. 2671 */ 2672# define NORET_TYPE /**/ 2673# define ATTRIB_NORET __attribute__((noreturn)) 2674# define NORET_AND noreturn, 2675 2676/* bitmap.c */ 2677extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2678void ext4_inode_bitmap_csum_set(struct super_block *sb, 2679 struct ext4_group_desc *gdp, 2680 struct buffer_head *bh, int sz); 2681int ext4_inode_bitmap_csum_verify(struct super_block *sb, 2682 struct ext4_group_desc *gdp, 2683 struct buffer_head *bh, int sz); 2684void ext4_block_bitmap_csum_set(struct super_block *sb, 2685 struct ext4_group_desc *gdp, 2686 struct buffer_head *bh); 2687int ext4_block_bitmap_csum_verify(struct super_block *sb, 2688 struct ext4_group_desc *gdp, 2689 struct buffer_head *bh); 2690 2691/* balloc.c */ 2692extern void ext4_get_group_no_and_offset(struct super_block *sb, 2693 ext4_fsblk_t blocknr, 2694 ext4_group_t *blockgrpp, 2695 ext4_grpblk_t *offsetp); 2696extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2697 ext4_fsblk_t block); 2698 2699extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2700extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2701 ext4_group_t group); 2702extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2703 ext4_fsblk_t goal, 2704 unsigned int flags, 2705 unsigned long *count, 2706 int *errp); 2707extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2708 s64 nclusters, unsigned int flags); 2709extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2710extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2711 ext4_group_t block_group, 2712 struct buffer_head ** bh); 2713extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2714 ext4_group_t group); 2715extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2716 2717extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2718 ext4_group_t block_group, 2719 bool ignore_locked); 2720extern int ext4_wait_block_bitmap(struct super_block *sb, 2721 ext4_group_t block_group, 2722 struct buffer_head *bh); 2723extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2724 ext4_group_t block_group); 2725extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2726 ext4_group_t block_group, 2727 struct ext4_group_desc *gdp); 2728ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2729 2730#if IS_ENABLED(CONFIG_UNICODE) 2731extern int ext4_fname_setup_ci_filename(struct inode *dir, 2732 const struct qstr *iname, 2733 struct ext4_filename *fname); 2734#endif 2735 2736/* ext4 encryption related stuff goes here crypto.c */ 2737#ifdef CONFIG_FS_ENCRYPTION 2738extern const struct fscrypt_operations ext4_cryptops; 2739 2740int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2741 int lookup, struct ext4_filename *fname); 2742 2743int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry, 2744 struct ext4_filename *fname); 2745 2746void ext4_fname_free_filename(struct ext4_filename *fname); 2747 2748int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg); 2749 2750#else /* !CONFIG_FS_ENCRYPTION */ 2751static inline int ext4_fname_setup_filename(struct inode *dir, 2752 const struct qstr *iname, 2753 int lookup, 2754 struct ext4_filename *fname) 2755{ 2756 int err = 0; 2757 fname->usr_fname = iname; 2758 fname->disk_name.name = (unsigned char *) iname->name; 2759 fname->disk_name.len = iname->len; 2760 2761#if IS_ENABLED(CONFIG_UNICODE) 2762 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2763#endif 2764 2765 return err; 2766} 2767 2768static inline int ext4_fname_prepare_lookup(struct inode *dir, 2769 struct dentry *dentry, 2770 struct ext4_filename *fname) 2771{ 2772 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2773} 2774 2775static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2776{ 2777#if IS_ENABLED(CONFIG_UNICODE) 2778 kfree(fname->cf_name.name); 2779 fname->cf_name.name = NULL; 2780#endif 2781} 2782 2783static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp, 2784 void __user *arg) 2785{ 2786 return -EOPNOTSUPP; 2787} 2788#endif /* !CONFIG_FS_ENCRYPTION */ 2789 2790/* dir.c */ 2791extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2792 struct file *, 2793 struct ext4_dir_entry_2 *, 2794 struct buffer_head *, char *, int, 2795 unsigned int); 2796#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2797 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2798 (de), (bh), (buf), (size), (offset))) 2799extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2800 __u32 minor_hash, 2801 struct ext4_dir_entry_2 *dirent, 2802 struct fscrypt_str *ent_name); 2803extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2804extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2805 struct buffer_head *bh, 2806 void *buf, int buf_size, 2807 struct ext4_filename *fname, 2808 struct ext4_dir_entry_2 **dest_de); 2809void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2810 struct ext4_dir_entry_2 *de, 2811 int buf_size, 2812 struct ext4_filename *fname); 2813static inline void ext4_update_dx_flag(struct inode *inode) 2814{ 2815 if (!ext4_has_feature_dir_index(inode->i_sb) && 2816 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2817 /* ext4_iget() should have caught this... */ 2818 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2819 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2820 } 2821} 2822static const unsigned char ext4_filetype_table[] = { 2823 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2824}; 2825 2826static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2827{ 2828 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2829 return DT_UNKNOWN; 2830 2831 return ext4_filetype_table[filetype]; 2832} 2833extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2834 void *buf, int buf_size); 2835 2836/* fsync.c */ 2837extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2838 2839/* hash.c */ 2840extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2841 struct dx_hash_info *hinfo); 2842 2843/* ialloc.c */ 2844extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2845extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *, 2846 struct inode *, umode_t, 2847 const struct qstr *qstr, __u32 goal, 2848 uid_t *owner, __u32 i_flags, 2849 int handle_type, unsigned int line_no, 2850 int nblocks); 2851 2852#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2853 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \ 2854 (goal), (owner), i_flags, 0, 0, 0) 2855#define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \ 2856 type, nblocks) \ 2857 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2858 0, (type), __LINE__, (nblocks)) 2859 2860 2861extern void ext4_free_inode(handle_t *, struct inode *); 2862extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2863extern unsigned long ext4_count_free_inodes(struct super_block *); 2864extern unsigned long ext4_count_dirs(struct super_block *); 2865extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2866extern int ext4_init_inode_table(struct super_block *sb, 2867 ext4_group_t group, int barrier); 2868extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2869 2870/* fast_commit.c */ 2871int ext4_fc_info_show(struct seq_file *seq, void *v); 2872void ext4_fc_init(struct super_block *sb, journal_t *journal); 2873void ext4_fc_init_inode(struct inode *inode); 2874void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2875 ext4_lblk_t end); 2876void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2877 struct dentry *dentry); 2878void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2879 struct dentry *dentry); 2880void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2881void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2882void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2883 struct dentry *dentry); 2884void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2885void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2886void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); 2887void ext4_fc_start_update(struct inode *inode); 2888void ext4_fc_stop_update(struct inode *inode); 2889void ext4_fc_del(struct inode *inode); 2890bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2891void ext4_fc_replay_cleanup(struct super_block *sb); 2892int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2893int __init ext4_fc_init_dentry_cache(void); 2894void ext4_fc_destroy_dentry_cache(void); 2895int ext4_fc_record_regions(struct super_block *sb, int ino, 2896 ext4_lblk_t lblk, ext4_fsblk_t pblk, 2897 int len, int replay); 2898 2899/* mballoc.c */ 2900extern const struct seq_operations ext4_mb_seq_groups_ops; 2901extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2902extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2903extern int ext4_mb_init(struct super_block *); 2904extern int ext4_mb_release(struct super_block *); 2905extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2906 struct ext4_allocation_request *, int *); 2907extern void ext4_discard_preallocations(struct inode *, unsigned int); 2908extern int __init ext4_init_mballoc(void); 2909extern void ext4_exit_mballoc(void); 2910extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2911 ext4_group_t group, 2912 unsigned int nr, int *cnt); 2913extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2914 unsigned int nr); 2915 2916extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2917 struct buffer_head *bh, ext4_fsblk_t block, 2918 unsigned long count, int flags); 2919extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2920 ext4_group_t ngroups); 2921extern int ext4_mb_add_groupinfo(struct super_block *sb, 2922 ext4_group_t i, struct ext4_group_desc *desc); 2923extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2924 ext4_fsblk_t block, unsigned long count); 2925extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2926extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2927extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2928 int len, int state); 2929static inline bool ext4_mb_cr_expensive(enum criteria cr) 2930{ 2931 return cr >= CR_GOAL_LEN_SLOW; 2932} 2933 2934/* inode.c */ 2935void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2936 struct ext4_inode_info *ei); 2937int ext4_inode_is_fast_symlink(struct inode *inode); 2938struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2939struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2940int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2941 bool wait, struct buffer_head **bhs); 2942int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2943 struct buffer_head *bh_result, int create); 2944int ext4_get_block(struct inode *inode, sector_t iblock, 2945 struct buffer_head *bh_result, int create); 2946int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2947 struct buffer_head *bh, int create); 2948int ext4_walk_page_buffers(handle_t *handle, 2949 struct inode *inode, 2950 struct buffer_head *head, 2951 unsigned from, 2952 unsigned to, 2953 int *partial, 2954 int (*fn)(handle_t *handle, struct inode *inode, 2955 struct buffer_head *bh)); 2956int do_journal_get_write_access(handle_t *handle, struct inode *inode, 2957 struct buffer_head *bh); 2958#define FALL_BACK_TO_NONDELALLOC 1 2959#define CONVERT_INLINE_DATA 2 2960 2961typedef enum { 2962 EXT4_IGET_NORMAL = 0, 2963 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2964 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */ 2965 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */ 2966 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */ 2967} ext4_iget_flags; 2968 2969extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2970 ext4_iget_flags flags, const char *function, 2971 unsigned int line); 2972 2973#define ext4_iget(sb, ino, flags) \ 2974 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2975 2976extern int ext4_write_inode(struct inode *, struct writeback_control *); 2977extern int ext4_setattr(struct mnt_idmap *, struct dentry *, 2978 struct iattr *); 2979extern u32 ext4_dio_alignment(struct inode *inode); 2980extern int ext4_getattr(struct mnt_idmap *, const struct path *, 2981 struct kstat *, u32, unsigned int); 2982extern void ext4_evict_inode(struct inode *); 2983extern void ext4_clear_inode(struct inode *); 2984extern int ext4_file_getattr(struct mnt_idmap *, const struct path *, 2985 struct kstat *, u32, unsigned int); 2986extern void ext4_dirty_inode(struct inode *, int); 2987extern int ext4_change_inode_journal_flag(struct inode *, int); 2988extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2989extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 2990 struct ext4_iloc *iloc); 2991extern int ext4_inode_attach_jinode(struct inode *inode); 2992extern int ext4_can_truncate(struct inode *inode); 2993extern int ext4_truncate(struct inode *); 2994extern int ext4_break_layouts(struct inode *); 2995extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 2996extern void ext4_set_inode_flags(struct inode *, bool init); 2997extern int ext4_alloc_da_blocks(struct inode *inode); 2998extern void ext4_set_aops(struct inode *inode); 2999extern int ext4_writepage_trans_blocks(struct inode *); 3000extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode); 3001extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 3002extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 3003 loff_t lstart, loff_t lend); 3004extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 3005extern qsize_t *ext4_get_reserved_space(struct inode *inode); 3006extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 3007extern void ext4_da_release_space(struct inode *inode, int to_free); 3008extern void ext4_da_update_reserve_space(struct inode *inode, 3009 int used, int quota_claim); 3010extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 3011 ext4_fsblk_t pblk, ext4_lblk_t len); 3012 3013/* indirect.c */ 3014extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 3015 struct ext4_map_blocks *map, int flags); 3016extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 3017extern void ext4_ind_truncate(handle_t *, struct inode *inode); 3018extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 3019 ext4_lblk_t start, ext4_lblk_t end); 3020 3021/* ioctl.c */ 3022extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 3023extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 3024int ext4_fileattr_set(struct mnt_idmap *idmap, 3025 struct dentry *dentry, struct fileattr *fa); 3026int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); 3027extern void ext4_reset_inode_seed(struct inode *inode); 3028int ext4_update_overhead(struct super_block *sb, bool force); 3029int ext4_force_shutdown(struct super_block *sb, u32 flags); 3030 3031/* migrate.c */ 3032extern int ext4_ext_migrate(struct inode *); 3033extern int ext4_ind_migrate(struct inode *inode); 3034 3035/* namei.c */ 3036extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3037 struct inode *inode); 3038extern int ext4_dirblock_csum_verify(struct inode *inode, 3039 struct buffer_head *bh); 3040extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3041 __u32 start_minor_hash, __u32 *next_hash); 3042extern int ext4_search_dir(struct buffer_head *bh, 3043 char *search_buf, 3044 int buf_size, 3045 struct inode *dir, 3046 struct ext4_filename *fname, 3047 unsigned int offset, 3048 struct ext4_dir_entry_2 **res_dir); 3049extern int ext4_generic_delete_entry(struct inode *dir, 3050 struct ext4_dir_entry_2 *de_del, 3051 struct buffer_head *bh, 3052 void *entry_buf, 3053 int buf_size, 3054 int csum_size); 3055extern bool ext4_empty_dir(struct inode *inode); 3056 3057/* resize.c */ 3058extern void ext4_kvfree_array_rcu(void *to_free); 3059extern int ext4_group_add(struct super_block *sb, 3060 struct ext4_new_group_data *input); 3061extern int ext4_group_extend(struct super_block *sb, 3062 struct ext4_super_block *es, 3063 ext4_fsblk_t n_blocks_count); 3064extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3065extern unsigned int ext4_list_backups(struct super_block *sb, 3066 unsigned int *three, unsigned int *five, 3067 unsigned int *seven); 3068 3069/* super.c */ 3070extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3071 sector_t block, blk_opf_t op_flags); 3072extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3073 sector_t block); 3074extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, 3075 bh_end_io_t *end_io); 3076extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, 3077 bh_end_io_t *end_io); 3078extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait); 3079extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3080extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3081extern int ext4_calculate_overhead(struct super_block *sb); 3082extern __le32 ext4_superblock_csum(struct super_block *sb, 3083 struct ext4_super_block *es); 3084extern void ext4_superblock_csum_set(struct super_block *sb); 3085extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3086 ext4_group_t ngroup); 3087extern const char *ext4_decode_error(struct super_block *sb, int errno, 3088 char nbuf[16]); 3089extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3090 ext4_group_t block_group, 3091 unsigned int flags); 3092extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb, 3093 ext4_group_t block_group); 3094 3095extern __printf(7, 8) 3096void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3097 int, __u64, const char *, ...); 3098extern __printf(6, 7) 3099void __ext4_error_inode(struct inode *, const char *, unsigned int, 3100 ext4_fsblk_t, int, const char *, ...); 3101extern __printf(5, 6) 3102void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3103 const char *, ...); 3104extern void __ext4_std_error(struct super_block *, const char *, 3105 unsigned int, int); 3106extern __printf(4, 5) 3107void __ext4_warning(struct super_block *, const char *, unsigned int, 3108 const char *, ...); 3109extern __printf(4, 5) 3110void __ext4_warning_inode(const struct inode *inode, const char *function, 3111 unsigned int line, const char *fmt, ...); 3112extern __printf(3, 4) 3113void __ext4_msg(struct super_block *, const char *, const char *, ...); 3114extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3115 const char *, unsigned int, const char *); 3116extern __printf(7, 8) 3117void __ext4_grp_locked_error(const char *, unsigned int, 3118 struct super_block *, ext4_group_t, 3119 unsigned long, ext4_fsblk_t, 3120 const char *, ...); 3121 3122#define EXT4_ERROR_INODE(inode, fmt, a...) \ 3123 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3124 3125#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3126 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3127 3128#define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3129 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3130 (fmt), ## a) 3131 3132#define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3133 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3134 3135#define ext4_abort(sb, err, fmt, a...) \ 3136 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3137 3138#ifdef CONFIG_PRINTK 3139 3140#define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3141 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3142#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3143 __ext4_error_inode((inode), (func), (line), (block), \ 3144 (err), (fmt), ##__VA_ARGS__) 3145#define ext4_error_file(file, func, line, block, fmt, ...) \ 3146 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3147#define ext4_error(sb, fmt, ...) \ 3148 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3149 ##__VA_ARGS__) 3150#define ext4_error_err(sb, err, fmt, ...) \ 3151 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3152 ##__VA_ARGS__) 3153#define ext4_warning(sb, fmt, ...) \ 3154 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3155#define ext4_warning_inode(inode, fmt, ...) \ 3156 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3157#define ext4_msg(sb, level, fmt, ...) \ 3158 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3159#define dump_mmp_msg(sb, mmp, msg) \ 3160 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3161#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3162 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3163 fmt, ##__VA_ARGS__) 3164 3165#else 3166 3167#define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3168do { \ 3169 no_printk(fmt, ##__VA_ARGS__); \ 3170 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3171} while (0) 3172#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3173do { \ 3174 no_printk(fmt, ##__VA_ARGS__); \ 3175 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3176} while (0) 3177#define ext4_error_file(file, func, line, block, fmt, ...) \ 3178do { \ 3179 no_printk(fmt, ##__VA_ARGS__); \ 3180 __ext4_error_file(file, "", 0, block, " "); \ 3181} while (0) 3182#define ext4_error(sb, fmt, ...) \ 3183do { \ 3184 no_printk(fmt, ##__VA_ARGS__); \ 3185 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3186} while (0) 3187#define ext4_error_err(sb, err, fmt, ...) \ 3188do { \ 3189 no_printk(fmt, ##__VA_ARGS__); \ 3190 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3191} while (0) 3192#define ext4_warning(sb, fmt, ...) \ 3193do { \ 3194 no_printk(fmt, ##__VA_ARGS__); \ 3195 __ext4_warning(sb, "", 0, " "); \ 3196} while (0) 3197#define ext4_warning_inode(inode, fmt, ...) \ 3198do { \ 3199 no_printk(fmt, ##__VA_ARGS__); \ 3200 __ext4_warning_inode(inode, "", 0, " "); \ 3201} while (0) 3202#define ext4_msg(sb, level, fmt, ...) \ 3203do { \ 3204 no_printk(fmt, ##__VA_ARGS__); \ 3205 __ext4_msg(sb, "", " "); \ 3206} while (0) 3207#define dump_mmp_msg(sb, mmp, msg) \ 3208 __dump_mmp_msg(sb, mmp, "", 0, "") 3209#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3210do { \ 3211 no_printk(fmt, ##__VA_ARGS__); \ 3212 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3213} while (0) 3214 3215#endif 3216 3217extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3218 struct ext4_group_desc *bg); 3219extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3220 struct ext4_group_desc *bg); 3221extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3222 struct ext4_group_desc *bg); 3223extern __u32 ext4_free_group_clusters(struct super_block *sb, 3224 struct ext4_group_desc *bg); 3225extern __u32 ext4_free_inodes_count(struct super_block *sb, 3226 struct ext4_group_desc *bg); 3227extern __u32 ext4_used_dirs_count(struct super_block *sb, 3228 struct ext4_group_desc *bg); 3229extern __u32 ext4_itable_unused_count(struct super_block *sb, 3230 struct ext4_group_desc *bg); 3231extern void ext4_block_bitmap_set(struct super_block *sb, 3232 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3233extern void ext4_inode_bitmap_set(struct super_block *sb, 3234 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3235extern void ext4_inode_table_set(struct super_block *sb, 3236 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3237extern void ext4_free_group_clusters_set(struct super_block *sb, 3238 struct ext4_group_desc *bg, 3239 __u32 count); 3240extern void ext4_free_inodes_set(struct super_block *sb, 3241 struct ext4_group_desc *bg, __u32 count); 3242extern void ext4_used_dirs_set(struct super_block *sb, 3243 struct ext4_group_desc *bg, __u32 count); 3244extern void ext4_itable_unused_set(struct super_block *sb, 3245 struct ext4_group_desc *bg, __u32 count); 3246extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3247 struct ext4_group_desc *gdp); 3248extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3249 struct ext4_group_desc *gdp); 3250extern int ext4_register_li_request(struct super_block *sb, 3251 ext4_group_t first_not_zeroed); 3252 3253static inline int ext4_has_metadata_csum(struct super_block *sb) 3254{ 3255 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3256 !EXT4_SB(sb)->s_chksum_driver); 3257 3258 return ext4_has_feature_metadata_csum(sb) && 3259 (EXT4_SB(sb)->s_chksum_driver != NULL); 3260} 3261 3262static inline int ext4_has_group_desc_csum(struct super_block *sb) 3263{ 3264 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3265} 3266 3267#define ext4_read_incompat_64bit_val(es, name) \ 3268 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3269 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3270 le32_to_cpu(es->name##_lo)) 3271 3272static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3273{ 3274 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3275} 3276 3277static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3278{ 3279 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3280} 3281 3282static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3283{ 3284 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3285} 3286 3287static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3288 ext4_fsblk_t blk) 3289{ 3290 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3291 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3292} 3293 3294static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3295 ext4_fsblk_t blk) 3296{ 3297 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3298 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3299} 3300 3301static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3302 ext4_fsblk_t blk) 3303{ 3304 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3305 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3306} 3307 3308static inline loff_t ext4_isize(struct super_block *sb, 3309 struct ext4_inode *raw_inode) 3310{ 3311 if (ext4_has_feature_largedir(sb) || 3312 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3313 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3314 le32_to_cpu(raw_inode->i_size_lo); 3315 3316 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3317} 3318 3319static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3320{ 3321 raw_inode->i_size_lo = cpu_to_le32(i_size); 3322 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3323} 3324 3325/* 3326 * Reading s_groups_count requires using smp_rmb() afterwards. See 3327 * the locking protocol documented in the comments of ext4_group_add() 3328 * in resize.c 3329 */ 3330static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3331{ 3332 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3333 3334 smp_rmb(); 3335 return ngroups; 3336} 3337 3338static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3339 ext4_group_t block_group) 3340{ 3341 return block_group >> sbi->s_log_groups_per_flex; 3342} 3343 3344static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3345{ 3346 return 1 << sbi->s_log_groups_per_flex; 3347} 3348 3349#define ext4_std_error(sb, errno) \ 3350do { \ 3351 if ((errno)) \ 3352 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3353} while (0) 3354 3355#ifdef CONFIG_SMP 3356/* Each CPU can accumulate percpu_counter_batch clusters in their local 3357 * counters. So we need to make sure we have free clusters more 3358 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3359 */ 3360#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3361#else 3362#define EXT4_FREECLUSTERS_WATERMARK 0 3363#endif 3364 3365/* Update i_disksize. Requires i_rwsem to avoid races with truncate */ 3366static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3367{ 3368 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3369 !inode_is_locked(inode)); 3370 down_write(&EXT4_I(inode)->i_data_sem); 3371 if (newsize > EXT4_I(inode)->i_disksize) 3372 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3373 up_write(&EXT4_I(inode)->i_data_sem); 3374} 3375 3376/* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ 3377static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3378{ 3379 int changed = 0; 3380 3381 if (newsize > inode->i_size) { 3382 i_size_write(inode, newsize); 3383 changed = 1; 3384 } 3385 if (newsize > EXT4_I(inode)->i_disksize) { 3386 ext4_update_i_disksize(inode, newsize); 3387 changed |= 2; 3388 } 3389 return changed; 3390} 3391 3392int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3393 loff_t len); 3394 3395struct ext4_group_info { 3396 unsigned long bb_state; 3397#ifdef AGGRESSIVE_CHECK 3398 unsigned long bb_check_counter; 3399#endif 3400 struct rb_root bb_free_root; 3401 ext4_grpblk_t bb_first_free; /* first free block */ 3402 ext4_grpblk_t bb_free; /* total free blocks */ 3403 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3404 int bb_avg_fragment_size_order; /* order of average 3405 fragment in BG */ 3406 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3407 ext4_group_t bb_group; /* Group number */ 3408 struct list_head bb_prealloc_list; 3409#ifdef DOUBLE_CHECK 3410 void *bb_bitmap; 3411#endif 3412 struct rw_semaphore alloc_sem; 3413 struct list_head bb_avg_fragment_size_node; 3414 struct list_head bb_largest_free_order_node; 3415 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3416 * regions, index is order. 3417 * bb_counters[3] = 5 means 3418 * 5 free 8-block regions. */ 3419}; 3420 3421#define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3422#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3423#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3424#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3425#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3426 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3427#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3428 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3429#define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3430 3431#define EXT4_MB_GRP_NEED_INIT(grp) \ 3432 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3433#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3434 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3435#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3436 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3437 3438#define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3439 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3440#define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3441 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3442#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3443 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3444#define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3445 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3446 3447#define EXT4_MAX_CONTENTION 8 3448#define EXT4_CONTENTION_THRESHOLD 2 3449 3450static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3451 ext4_group_t group) 3452{ 3453 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3454} 3455 3456/* 3457 * Returns true if the filesystem is busy enough that attempts to 3458 * access the block group locks has run into contention. 3459 */ 3460static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3461{ 3462 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3463} 3464 3465static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3466{ 3467 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3468 if (spin_trylock(lock)) 3469 /* 3470 * We're able to grab the lock right away, so drop the 3471 * lock contention counter. 3472 */ 3473 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3474 else { 3475 /* 3476 * The lock is busy, so bump the contention counter, 3477 * and then wait on the spin lock. 3478 */ 3479 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3480 EXT4_MAX_CONTENTION); 3481 spin_lock(lock); 3482 } 3483} 3484 3485static inline void ext4_unlock_group(struct super_block *sb, 3486 ext4_group_t group) 3487{ 3488 spin_unlock(ext4_group_lock_ptr(sb, group)); 3489} 3490 3491#ifdef CONFIG_QUOTA 3492static inline bool ext4_quota_capable(struct super_block *sb) 3493{ 3494 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3495} 3496 3497static inline bool ext4_is_quota_journalled(struct super_block *sb) 3498{ 3499 struct ext4_sb_info *sbi = EXT4_SB(sb); 3500 3501 return (ext4_has_feature_quota(sb) || 3502 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3503} 3504int ext4_enable_quotas(struct super_block *sb); 3505#endif 3506 3507/* 3508 * Block validity checking 3509 */ 3510#define ext4_check_indirect_blockref(inode, bh) \ 3511 ext4_check_blockref(__func__, __LINE__, inode, \ 3512 (__le32 *)(bh)->b_data, \ 3513 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3514 3515#define ext4_ind_check_inode(inode) \ 3516 ext4_check_blockref(__func__, __LINE__, inode, \ 3517 EXT4_I(inode)->i_data, \ 3518 EXT4_NDIR_BLOCKS) 3519 3520/* 3521 * Inodes and files operations 3522 */ 3523 3524/* dir.c */ 3525extern const struct file_operations ext4_dir_operations; 3526 3527/* file.c */ 3528extern const struct inode_operations ext4_file_inode_operations; 3529extern const struct file_operations ext4_file_operations; 3530extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3531 3532/* inline.c */ 3533extern int ext4_get_max_inline_size(struct inode *inode); 3534extern int ext4_find_inline_data_nolock(struct inode *inode); 3535extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3536 3537int ext4_readpage_inline(struct inode *inode, struct folio *folio); 3538extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3539 struct inode *inode, 3540 loff_t pos, unsigned len, 3541 struct page **pagep); 3542int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, 3543 unsigned copied, struct folio *folio); 3544extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3545 struct inode *inode, 3546 loff_t pos, unsigned len, 3547 struct page **pagep, 3548 void **fsdata); 3549extern int ext4_try_add_inline_entry(handle_t *handle, 3550 struct ext4_filename *fname, 3551 struct inode *dir, struct inode *inode); 3552extern int ext4_try_create_inline_dir(handle_t *handle, 3553 struct inode *parent, 3554 struct inode *inode); 3555extern int ext4_read_inline_dir(struct file *filp, 3556 struct dir_context *ctx, 3557 int *has_inline_data); 3558extern int ext4_inlinedir_to_tree(struct file *dir_file, 3559 struct inode *dir, ext4_lblk_t block, 3560 struct dx_hash_info *hinfo, 3561 __u32 start_hash, __u32 start_minor_hash, 3562 int *has_inline_data); 3563extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3564 struct ext4_filename *fname, 3565 struct ext4_dir_entry_2 **res_dir, 3566 int *has_inline_data); 3567extern int ext4_delete_inline_entry(handle_t *handle, 3568 struct inode *dir, 3569 struct ext4_dir_entry_2 *de_del, 3570 struct buffer_head *bh, 3571 int *has_inline_data); 3572extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3573extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3574 struct ext4_dir_entry_2 **parent_de, 3575 int *retval); 3576extern void *ext4_read_inline_link(struct inode *inode); 3577 3578struct iomap; 3579extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3580 3581extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3582 3583extern int ext4_convert_inline_data(struct inode *inode); 3584 3585static inline int ext4_has_inline_data(struct inode *inode) 3586{ 3587 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3588 EXT4_I(inode)->i_inline_off; 3589} 3590 3591/* namei.c */ 3592extern const struct inode_operations ext4_dir_inode_operations; 3593extern const struct inode_operations ext4_special_inode_operations; 3594extern struct dentry *ext4_get_parent(struct dentry *child); 3595extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3596 struct ext4_dir_entry_2 *de, 3597 int blocksize, int csum_size, 3598 unsigned int parent_ino, int dotdot_real_len); 3599extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3600 unsigned int blocksize); 3601extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3602 struct buffer_head *bh); 3603extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, 3604 struct inode *inode, struct dentry *dentry); 3605extern int __ext4_link(struct inode *dir, struct inode *inode, 3606 struct dentry *dentry); 3607 3608#define S_SHIFT 12 3609static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3610 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3611 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3612 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3613 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3614 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3615 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3616 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3617}; 3618 3619static inline void ext4_set_de_type(struct super_block *sb, 3620 struct ext4_dir_entry_2 *de, 3621 umode_t mode) { 3622 if (ext4_has_feature_filetype(sb)) 3623 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3624} 3625 3626/* readpages.c */ 3627extern int ext4_mpage_readpages(struct inode *inode, 3628 struct readahead_control *rac, struct folio *folio); 3629extern int __init ext4_init_post_read_processing(void); 3630extern void ext4_exit_post_read_processing(void); 3631 3632/* symlink.c */ 3633extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3634extern const struct inode_operations ext4_symlink_inode_operations; 3635extern const struct inode_operations ext4_fast_symlink_inode_operations; 3636 3637/* sysfs.c */ 3638extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3639extern int ext4_register_sysfs(struct super_block *sb); 3640extern void ext4_unregister_sysfs(struct super_block *sb); 3641extern int __init ext4_init_sysfs(void); 3642extern void ext4_exit_sysfs(void); 3643 3644/* block_validity */ 3645extern void ext4_release_system_zone(struct super_block *sb); 3646extern int ext4_setup_system_zone(struct super_block *sb); 3647extern int __init ext4_init_system_zone(void); 3648extern void ext4_exit_system_zone(void); 3649extern int ext4_inode_block_valid(struct inode *inode, 3650 ext4_fsblk_t start_blk, 3651 unsigned int count); 3652extern int ext4_check_blockref(const char *, unsigned int, 3653 struct inode *, __le32 *, unsigned int); 3654extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, 3655 ext4_fsblk_t start_blk, unsigned int count); 3656 3657 3658/* extents.c */ 3659struct ext4_ext_path; 3660struct ext4_extent; 3661 3662/* 3663 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3664 * __le32. 3665 */ 3666#define EXT_MAX_BLOCKS 0xffffffff 3667 3668extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3669extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3670extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3671 struct ext4_map_blocks *map, int flags); 3672extern int ext4_ext_truncate(handle_t *, struct inode *); 3673extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3674 ext4_lblk_t end); 3675extern void ext4_ext_init(struct super_block *); 3676extern void ext4_ext_release(struct super_block *); 3677extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3678 loff_t len); 3679extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3680 loff_t offset, ssize_t len); 3681extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3682 ext4_io_end_t *io_end); 3683extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3684 struct ext4_map_blocks *map, int flags); 3685extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3686 int num, 3687 struct ext4_ext_path *path); 3688extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3689 struct ext4_ext_path **, 3690 struct ext4_extent *, int); 3691extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3692 struct ext4_ext_path **, 3693 int flags); 3694extern void ext4_free_ext_path(struct ext4_ext_path *); 3695extern int ext4_ext_check_inode(struct inode *inode); 3696extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3697extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3698 __u64 start, __u64 len); 3699extern int ext4_get_es_cache(struct inode *inode, 3700 struct fiemap_extent_info *fieinfo, 3701 __u64 start, __u64 len); 3702extern int ext4_ext_precache(struct inode *inode); 3703extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3704 struct inode *inode2, ext4_lblk_t lblk1, 3705 ext4_lblk_t lblk2, ext4_lblk_t count, 3706 int mark_unwritten,int *err); 3707extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3708extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3709 int check_cred, int restart_cred, 3710 int revoke_cred); 3711extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3712extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3713extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3714 int len, int unwritten, ext4_fsblk_t pblk); 3715extern int ext4_ext_clear_bb(struct inode *inode); 3716 3717 3718/* move_extent.c */ 3719extern void ext4_double_down_write_data_sem(struct inode *first, 3720 struct inode *second); 3721extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3722 struct inode *donor_inode); 3723extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3724 __u64 start_orig, __u64 start_donor, 3725 __u64 len, __u64 *moved_len); 3726 3727/* page-io.c */ 3728extern int __init ext4_init_pageio(void); 3729extern void ext4_exit_pageio(void); 3730extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3731extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3732extern int ext4_put_io_end(ext4_io_end_t *io_end); 3733extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3734extern void ext4_io_submit_init(struct ext4_io_submit *io, 3735 struct writeback_control *wbc); 3736extern void ext4_end_io_rsv_work(struct work_struct *work); 3737extern void ext4_io_submit(struct ext4_io_submit *io); 3738int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page, 3739 size_t len); 3740extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3741extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3742 3743/* mmp.c */ 3744extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3745 3746/* mmp.c */ 3747extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3748 3749/* verity.c */ 3750extern const struct fsverity_operations ext4_verityops; 3751 3752/* orphan.c */ 3753extern int ext4_orphan_add(handle_t *, struct inode *); 3754extern int ext4_orphan_del(handle_t *, struct inode *); 3755extern void ext4_orphan_cleanup(struct super_block *sb, 3756 struct ext4_super_block *es); 3757extern void ext4_release_orphan_info(struct super_block *sb); 3758extern int ext4_init_orphan_info(struct super_block *sb); 3759extern int ext4_orphan_file_empty(struct super_block *sb); 3760extern void ext4_orphan_file_block_trigger( 3761 struct jbd2_buffer_trigger_type *triggers, 3762 struct buffer_head *bh, 3763 void *data, size_t size); 3764 3765/* 3766 * Add new method to test whether block and inode bitmaps are properly 3767 * initialized. With uninit_bg reading the block from disk is not enough 3768 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3769 */ 3770#define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3771 3772static inline int bitmap_uptodate(struct buffer_head *bh) 3773{ 3774 return (buffer_uptodate(bh) && 3775 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3776} 3777static inline void set_bitmap_uptodate(struct buffer_head *bh) 3778{ 3779 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3780} 3781 3782/* For ioend & aio unwritten conversion wait queues */ 3783#define EXT4_WQ_HASH_SZ 37 3784#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3785 EXT4_WQ_HASH_SZ]) 3786extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3787 3788extern int ext4_resize_begin(struct super_block *sb); 3789extern int ext4_resize_end(struct super_block *sb, bool update_backups); 3790 3791static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3792 struct ext4_io_end *io_end) 3793{ 3794 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3795 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3796 atomic_inc(&EXT4_I(inode)->i_unwritten); 3797 } 3798} 3799 3800static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3801{ 3802 struct inode *inode = io_end->inode; 3803 3804 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3805 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3806 /* Wake up anyone waiting on unwritten extent conversion */ 3807 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3808 wake_up_all(ext4_ioend_wq(inode)); 3809 } 3810} 3811 3812extern const struct iomap_ops ext4_iomap_ops; 3813extern const struct iomap_ops ext4_iomap_overwrite_ops; 3814extern const struct iomap_ops ext4_iomap_report_ops; 3815 3816static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3817{ 3818 /* 3819 * If the buffer has the write error flag, we have failed 3820 * to write out data in the block. In this case, we don't 3821 * have to read the block because we may read the old data 3822 * successfully. 3823 */ 3824 if (buffer_write_io_error(bh)) 3825 set_buffer_uptodate(bh); 3826 return buffer_uptodate(bh); 3827} 3828 3829#endif /* __KERNEL__ */ 3830 3831#define EFSBADCRC EBADMSG /* Bad CRC detected */ 3832#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3833 3834#endif /* _EXT4_H */ 3835