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ext4.h
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linux-6.19.14/fs/ext4/ext4.h
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 <linux/crc32c.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 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/* first blocks in the file */ 189#define EXT4_MB_HINT_FIRST 0x0008 190/* data is being allocated */ 191#define EXT4_MB_HINT_DATA 0x0020 192/* don't preallocate (for tails) */ 193#define EXT4_MB_HINT_NOPREALLOC 0x0040 194/* allocate for locality group */ 195#define EXT4_MB_HINT_GROUP_ALLOC 0x0080 196/* allocate goal blocks or none */ 197#define EXT4_MB_HINT_GOAL_ONLY 0x0100 198/* goal is meaningful */ 199#define EXT4_MB_HINT_TRY_GOAL 0x0200 200/* blocks already pre-reserved by delayed allocation */ 201#define EXT4_MB_DELALLOC_RESERVED 0x0400 202/* We are doing stream allocation */ 203#define EXT4_MB_STREAM_ALLOC 0x0800 204/* Use reserved root blocks if needed */ 205#define EXT4_MB_USE_ROOT_BLOCKS 0x1000 206/* Use blocks from reserved pool */ 207#define EXT4_MB_USE_RESERVED 0x2000 208/* Do strict check for free blocks while retrying block allocation */ 209#define EXT4_MB_STRICT_CHECK 0x4000 210 211struct ext4_allocation_request { 212 /* target inode for block we're allocating */ 213 struct inode *inode; 214 /* how many blocks we want to allocate */ 215 unsigned int len; 216 /* logical block in target inode */ 217 ext4_lblk_t logical; 218 /* the closest logical allocated block to the left */ 219 ext4_lblk_t lleft; 220 /* the closest logical allocated block to the right */ 221 ext4_lblk_t lright; 222 /* phys. target (a hint) */ 223 ext4_fsblk_t goal; 224 /* phys. block for the closest logical allocated block to the left */ 225 ext4_fsblk_t pleft; 226 /* phys. block for the closest logical allocated block to the right */ 227 ext4_fsblk_t pright; 228 /* flags. see above EXT4_MB_HINT_* */ 229 unsigned int flags; 230}; 231 232/* 233 * Logical to physical block mapping, used by ext4_map_blocks() 234 * 235 * This structure is used to pass requests into ext4_map_blocks() as 236 * well as to store the information returned by ext4_map_blocks(). It 237 * takes less room on the stack than a struct buffer_head. 238 */ 239#define EXT4_MAP_NEW BIT(BH_New) 240#define EXT4_MAP_MAPPED BIT(BH_Mapped) 241#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 242#define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 243#define EXT4_MAP_DELAYED BIT(BH_Delay) 244/* 245 * This is for use in ext4_map_query_blocks() for a special case where we can 246 * have a physically and logically contiguous blocks split across two leaf 247 * nodes instead of a single extent. This is required in case of atomic writes 248 * to know whether the returned extent is last in leaf. If yes, then lookup for 249 * next in leaf block in ext4_map_query_blocks_next_in_leaf(). 250 * - This is never going to be added to any buffer head state. 251 * - We use the next available bit after BH_BITMAP_UPTODATE. 252 */ 253#define EXT4_MAP_QUERY_LAST_IN_LEAF BIT(BH_BITMAP_UPTODATE + 1) 254#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 255 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 256 EXT4_MAP_DELAYED | EXT4_MAP_QUERY_LAST_IN_LEAF) 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 u64 m_seq; 264}; 265 266/* 267 * Block validity checking, system zone rbtree. 268 */ 269struct ext4_system_blocks { 270 struct rb_root root; 271 struct rcu_head rcu; 272}; 273 274/* 275 * Flags for ext4_io_end->flags 276 */ 277#define EXT4_IO_END_UNWRITTEN 0x0001 278#define EXT4_IO_END_FAILED 0x0002 279 280#define EXT4_IO_END_DEFER_COMPLETION (EXT4_IO_END_UNWRITTEN | EXT4_IO_END_FAILED) 281 282struct ext4_io_end_vec { 283 struct list_head list; /* list of io_end_vec */ 284 loff_t offset; /* offset in the file */ 285 ssize_t size; /* size of the extent */ 286}; 287 288/* 289 * For converting unwritten extents on a work queue. 'handle' is used for 290 * buffered writeback. 291 */ 292typedef struct ext4_io_end { 293 struct list_head list; /* per-file finished IO list */ 294 handle_t *handle; /* handle reserved for extent 295 * conversion */ 296 struct inode *inode; /* file being written to */ 297 struct bio *bio; /* Linked list of completed 298 * bios covering the extent */ 299 unsigned int flag; /* unwritten or not */ 300 refcount_t count; /* reference counter */ 301 struct list_head list_vec; /* list of ext4_io_end_vec */ 302} ext4_io_end_t; 303 304struct ext4_io_submit { 305 struct writeback_control *io_wbc; 306 struct bio *io_bio; 307 ext4_io_end_t *io_end; 308 sector_t io_next_block; 309}; 310 311/* 312 * Special inodes numbers 313 */ 314#define EXT4_BAD_INO 1 /* Bad blocks inode */ 315#define EXT4_ROOT_INO 2 /* Root inode */ 316#define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 317#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 318#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 319#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 320#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 321#define EXT4_JOURNAL_INO 8 /* Journal inode */ 322 323/* First non-reserved inode for old ext4 filesystems */ 324#define EXT4_GOOD_OLD_FIRST_INO 11 325 326/* 327 * Maximal count of links to a file 328 */ 329#define EXT4_LINK_MAX 65000 330 331/* 332 * Macro-instructions used to manage several block sizes 333 */ 334#define EXT4_MIN_BLOCK_SIZE 1024 335#define EXT4_MAX_BLOCK_SIZE 65536 336#define EXT4_MIN_BLOCK_LOG_SIZE 10 337#define EXT4_MAX_BLOCK_LOG_SIZE 16 338#define EXT4_MAX_CLUSTER_LOG_SIZE 30 339#ifdef __KERNEL__ 340# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 341#else 342# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 343#endif 344#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 345#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 346 EXT4_SB(s)->s_cluster_bits) 347#ifdef __KERNEL__ 348# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 349# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 350#else 351# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 352#endif 353#ifdef __KERNEL__ 354#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 355#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 356#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 357#else 358#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 359 EXT4_GOOD_OLD_INODE_SIZE : \ 360 (s)->s_inode_size) 361#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 362 EXT4_GOOD_OLD_FIRST_INO : \ 363 (s)->s_first_ino) 364#endif 365#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 366#define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 367 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 368 blkbits)) 369#define EXT4_B_TO_LBLK(inode, offset) \ 370 (round_up((offset), i_blocksize(inode)) >> (inode)->i_blkbits) 371#define EXT4_LBLK_TO_B(inode, lblk) ((loff_t)(lblk) << (inode)->i_blkbits) 372 373/* Translate a block number to a page index */ 374#define EXT4_LBLK_TO_PG(inode, lblk) (EXT4_LBLK_TO_B((inode), (lblk)) >> \ 375 PAGE_SHIFT) 376/* Translate a page index to a block number */ 377#define EXT4_PG_TO_LBLK(inode, pnum) (((loff_t)(pnum) << PAGE_SHIFT) >> \ 378 (inode)->i_blkbits) 379/* Translate a block number to a cluster number */ 380#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 381/* Translate a cluster number to a block number */ 382#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 383/* Translate # of blks to # of clusters */ 384#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 385 (sbi)->s_cluster_bits) 386/* Mask out the low bits to get the starting block of the cluster */ 387#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 388 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 389#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 390 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 391/* Fill in the low bits to get the last block of the cluster */ 392#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 393 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 394/* Get the cluster offset */ 395#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 396 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 397#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 398 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 399 400/* 401 * Structure of a blocks group descriptor 402 */ 403struct ext4_group_desc 404{ 405 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 406 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 407 __le32 bg_inode_table_lo; /* Inodes table block */ 408 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 409 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 410 __le16 bg_used_dirs_count_lo; /* Directories count */ 411 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 412 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 413 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 414 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 415 __le16 bg_itable_unused_lo; /* Unused inodes count */ 416 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 417 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 418 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 419 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 420 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 421 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 422 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 423 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 424 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 425 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 426 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 427 __u32 bg_reserved; 428}; 429 430#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 431 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 432 sizeof(__le16)) 433#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 434 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 435 sizeof(__le16)) 436 437/* 438 * Structure of a flex block group info 439 */ 440 441struct flex_groups { 442 atomic64_t free_clusters; 443 atomic_t free_inodes; 444 atomic_t used_dirs; 445}; 446 447#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 448#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 449#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 450 451/* 452 * Macro-instructions used to manage group descriptors 453 */ 454#define EXT4_MIN_DESC_SIZE 32 455#define EXT4_MIN_DESC_SIZE_64BIT 64 456#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 457#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 458#ifdef __KERNEL__ 459# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 460# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 461# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 462# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 463# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 464#else 465# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 466# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 467# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 468#endif 469 470/* 471 * Constants relative to the data blocks 472 */ 473#define EXT4_NDIR_BLOCKS 12 474#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 475#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 476#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 477#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 478 479/* 480 * Inode flags 481 */ 482#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 483#define EXT4_UNRM_FL 0x00000002 /* Undelete */ 484#define EXT4_COMPR_FL 0x00000004 /* Compress file */ 485#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 486#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 487#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 488#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 489#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 490/* Reserved for compression usage... */ 491#define EXT4_DIRTY_FL 0x00000100 492#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 493#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 494 /* nb: was previously EXT2_ECOMPR_FL */ 495#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 496/* End compression flags --- maybe not all used */ 497#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 498#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 499#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 500#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 501#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 502#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 503#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 504#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 505#define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 506#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 507/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 508 509#define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 510 511#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 512#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 513#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 514#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 515 516/* User modifiable flags */ 517#define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 518 EXT4_UNRM_FL | \ 519 EXT4_COMPR_FL | \ 520 EXT4_SYNC_FL | \ 521 EXT4_IMMUTABLE_FL | \ 522 EXT4_APPEND_FL | \ 523 EXT4_NODUMP_FL | \ 524 EXT4_NOATIME_FL | \ 525 EXT4_JOURNAL_DATA_FL | \ 526 EXT4_NOTAIL_FL | \ 527 EXT4_DIRSYNC_FL | \ 528 EXT4_TOPDIR_FL | \ 529 EXT4_EXTENTS_FL | \ 530 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 531 EXT4_DAX_FL | \ 532 EXT4_PROJINHERIT_FL | \ 533 EXT4_CASEFOLD_FL) 534 535/* User visible flags */ 536#define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 537 EXT4_DIRTY_FL | \ 538 EXT4_COMPRBLK_FL | \ 539 EXT4_NOCOMPR_FL | \ 540 EXT4_ENCRYPT_FL | \ 541 EXT4_INDEX_FL | \ 542 EXT4_VERITY_FL | \ 543 EXT4_INLINE_DATA_FL) 544 545/* Flags that should be inherited by new inodes from their parent. */ 546#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 547 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 548 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 549 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 550 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 551 EXT4_DAX_FL) 552 553/* Flags that are appropriate for regular files (all but dir-specific ones). */ 554#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 555 EXT4_PROJINHERIT_FL)) 556 557/* Flags that are appropriate for non-directories/regular files. */ 558#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 559 560/* The only flags that should be swapped */ 561#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 562 563/* Flags which are mutually exclusive to DAX */ 564#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 565 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 566 567/* Mask out flags that are inappropriate for the given type of inode. */ 568static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 569{ 570 if (S_ISDIR(mode)) 571 return flags; 572 else if (S_ISREG(mode)) 573 return flags & EXT4_REG_FLMASK; 574 else 575 return flags & EXT4_OTHER_FLMASK; 576} 577 578/* 579 * Inode flags used for atomic set/get 580 */ 581enum { 582 EXT4_INODE_SECRM = 0, /* Secure deletion */ 583 EXT4_INODE_UNRM = 1, /* Undelete */ 584 EXT4_INODE_COMPR = 2, /* Compress file */ 585 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 586 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 587 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 588 EXT4_INODE_NODUMP = 6, /* do not dump file */ 589 EXT4_INODE_NOATIME = 7, /* do not update atime */ 590/* Reserved for compression usage... */ 591 EXT4_INODE_DIRTY = 8, 592 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 593 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 594 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 595/* End compression flags --- maybe not all used */ 596 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 597 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 598 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 599 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 600 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 601 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 602 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 603 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 604 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 605 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 606/* 22 was formerly EXT4_INODE_EOFBLOCKS */ 607 EXT4_INODE_DAX = 25, /* Inode is DAX */ 608 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 609 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 610 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 611 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 612}; 613 614/* 615 * Since it's pretty easy to mix up bit numbers and hex values, we use a 616 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 617 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 618 * any extra space in the compiled kernel image, otherwise, the build will fail. 619 * It's important that these values are the same, since we are using 620 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 621 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 622 * values found in ext2, ext3 and ext4 filesystems, and of course the values 623 * defined in e2fsprogs. 624 * 625 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 626 */ 627#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG)) 628#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 629 630static inline void ext4_check_flag_values(void) 631{ 632 CHECK_FLAG_VALUE(SECRM); 633 CHECK_FLAG_VALUE(UNRM); 634 CHECK_FLAG_VALUE(COMPR); 635 CHECK_FLAG_VALUE(SYNC); 636 CHECK_FLAG_VALUE(IMMUTABLE); 637 CHECK_FLAG_VALUE(APPEND); 638 CHECK_FLAG_VALUE(NODUMP); 639 CHECK_FLAG_VALUE(NOATIME); 640 CHECK_FLAG_VALUE(DIRTY); 641 CHECK_FLAG_VALUE(COMPRBLK); 642 CHECK_FLAG_VALUE(NOCOMPR); 643 CHECK_FLAG_VALUE(ENCRYPT); 644 CHECK_FLAG_VALUE(INDEX); 645 CHECK_FLAG_VALUE(IMAGIC); 646 CHECK_FLAG_VALUE(JOURNAL_DATA); 647 CHECK_FLAG_VALUE(NOTAIL); 648 CHECK_FLAG_VALUE(DIRSYNC); 649 CHECK_FLAG_VALUE(TOPDIR); 650 CHECK_FLAG_VALUE(HUGE_FILE); 651 CHECK_FLAG_VALUE(EXTENTS); 652 CHECK_FLAG_VALUE(VERITY); 653 CHECK_FLAG_VALUE(EA_INODE); 654 CHECK_FLAG_VALUE(INLINE_DATA); 655 CHECK_FLAG_VALUE(PROJINHERIT); 656 CHECK_FLAG_VALUE(CASEFOLD); 657 CHECK_FLAG_VALUE(RESERVED); 658} 659 660#if defined(__KERNEL__) && defined(CONFIG_COMPAT) 661struct compat_ext4_new_group_input { 662 u32 group; 663 compat_u64 block_bitmap; 664 compat_u64 inode_bitmap; 665 compat_u64 inode_table; 666 u32 blocks_count; 667 u16 reserved_blocks; 668 u16 unused; 669}; 670#endif 671 672/* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 673struct ext4_new_group_data { 674 __u32 group; 675 __u64 block_bitmap; 676 __u64 inode_bitmap; 677 __u64 inode_table; 678 __u32 blocks_count; 679 __u16 reserved_blocks; 680 __u16 mdata_blocks; 681 __u32 free_clusters_count; 682}; 683 684/* Indexes used to index group tables in ext4_new_group_data */ 685enum { 686 BLOCK_BITMAP = 0, /* block bitmap */ 687 INODE_BITMAP, /* inode bitmap */ 688 INODE_TABLE, /* inode tables */ 689 GROUP_TABLE_COUNT, 690}; 691 692/* 693 * Flags used by ext4_map_blocks() 694 */ 695 /* Allocate any needed blocks and/or convert an unwritten 696 extent to be an initialized ext4 */ 697#define EXT4_GET_BLOCKS_CREATE 0x0001 698 /* Request the creation of an unwritten extent */ 699#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 700#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 701 EXT4_GET_BLOCKS_CREATE) 702 /* Caller is from the delayed allocation writeout path 703 * finally doing the actual allocation of delayed blocks */ 704#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 705 /* 706 * This means that we cannot merge newly allocated extents, and if we 707 * found an unwritten extent, we need to split it. 708 */ 709#define EXT4_GET_BLOCKS_SPLIT_NOMERGE 0x0008 710 /* 711 * Caller is from the dio or dioread_nolock buffered IO, reqest to 712 * create an unwritten extent if it does not exist or split the 713 * found unwritten extent. Also do not merge the newly created 714 * unwritten extent, io end will convert unwritten to written, 715 * and try to merge the written extent. 716 */ 717#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_SPLIT_NOMERGE|\ 718 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 719 /* Convert unwritten extent to initialized. */ 720#define EXT4_GET_BLOCKS_CONVERT 0x0010 721 /* Eventual metadata allocation (due to growing extent tree) 722 * should not fail, so try to use reserved blocks for that.*/ 723#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 724 /* Don't normalize allocation size (used for fallocate) */ 725#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 726 /* Convert written extents to unwritten */ 727#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 728 /* Write zeros to newly created written extents */ 729#define EXT4_GET_BLOCKS_ZERO 0x0200 730#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 731 EXT4_GET_BLOCKS_ZERO) 732 /* Caller is in the context of data submission, such as writeback, 733 * fsync, etc. Especially, in the generic writeback path, caller will 734 * submit data before dropping transaction handle. This allows jbd2 735 * to avoid submitting data before commit. */ 736#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 737 /* Convert extent to initialized after IO complete */ 738#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT |\ 739 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |\ 740 EXT4_GET_BLOCKS_IO_SUBMIT) 741 /* Caller is in the atomic contex, find extent if it has been cached */ 742#define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 743/* 744 * Atomic write caller needs this to query in the slow path of mixed mapping 745 * case, when a contiguous extent can be split across two adjacent leaf nodes. 746 * Look EXT4_MAP_QUERY_LAST_IN_LEAF. 747 */ 748#define EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF 0x1000 749 750/* 751 * The bit position of these flags must not overlap with any of the 752 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 753 * read_extent_tree_block(), ext4_split_extent_at(), 754 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 755 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 756 * caching the extents when reading from the extent tree while a 757 * truncate or punch hole operation is in progress. 758 */ 759#define EXT4_EX_NOCACHE 0x40000000 760#define EXT4_EX_FORCE_CACHE 0x20000000 761#define EXT4_EX_NOFAIL 0x10000000 762/* 763 * ext4_map_query_blocks() uses this filter mask to filter the flags needed to 764 * pass while lookup/querying of on disk extent tree. 765 */ 766#define EXT4_EX_QUERY_FILTER (EXT4_EX_NOCACHE | EXT4_EX_FORCE_CACHE |\ 767 EXT4_EX_NOFAIL |\ 768 EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF) 769 770/* 771 * Flags used by ext4_free_blocks 772 */ 773#define EXT4_FREE_BLOCKS_METADATA 0x0001 774#define EXT4_FREE_BLOCKS_FORGET 0x0002 775#define EXT4_FREE_BLOCKS_VALIDATED 0x0004 776#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 777#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 778#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 779#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 780 781#if defined(__KERNEL__) && defined(CONFIG_COMPAT) 782/* 783 * ioctl commands in 32 bit emulation 784 */ 785#define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 786#define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 787#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 788#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 789#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 790#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 791#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 792#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 793#endif 794 795/* Max physical block we can address w/o extents */ 796#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 797 798/* Max logical block we can support */ 799#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 800 801/* 802 * Structure of an inode on the disk 803 */ 804struct ext4_inode { 805 __le16 i_mode; /* File mode */ 806 __le16 i_uid; /* Low 16 bits of Owner Uid */ 807 __le32 i_size_lo; /* Size in bytes */ 808 __le32 i_atime; /* Access time */ 809 __le32 i_ctime; /* Inode Change time */ 810 __le32 i_mtime; /* Modification time */ 811 __le32 i_dtime; /* Deletion Time */ 812 __le16 i_gid; /* Low 16 bits of Group Id */ 813 __le16 i_links_count; /* Links count */ 814 __le32 i_blocks_lo; /* Blocks count */ 815 __le32 i_flags; /* File flags */ 816 union { 817 struct { 818 __le32 l_i_version; 819 } linux1; 820 struct { 821 __u32 h_i_translator; 822 } hurd1; 823 struct { 824 __u32 m_i_reserved1; 825 } masix1; 826 } osd1; /* OS dependent 1 */ 827 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 828 __le32 i_generation; /* File version (for NFS) */ 829 __le32 i_file_acl_lo; /* File ACL */ 830 __le32 i_size_high; 831 __le32 i_obso_faddr; /* Obsoleted fragment address */ 832 union { 833 struct { 834 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 835 __le16 l_i_file_acl_high; 836 __le16 l_i_uid_high; /* these 2 fields */ 837 __le16 l_i_gid_high; /* were reserved2[0] */ 838 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 839 __le16 l_i_reserved; 840 } linux2; 841 struct { 842 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 843 __u16 h_i_mode_high; 844 __u16 h_i_uid_high; 845 __u16 h_i_gid_high; 846 __u32 h_i_author; 847 } hurd2; 848 struct { 849 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 850 __le16 m_i_file_acl_high; 851 __u32 m_i_reserved2[2]; 852 } masix2; 853 } osd2; /* OS dependent 2 */ 854 __le16 i_extra_isize; 855 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 856 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 857 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 858 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 859 __le32 i_crtime; /* File Creation time */ 860 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 861 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 862 __le32 i_projid; /* Project ID */ 863}; 864 865#define EXT4_EPOCH_BITS 2 866#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 867#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 868 869/* 870 * Extended fields will fit into an inode if the filesystem was formatted 871 * with large inodes (-I 256 or larger) and there are not currently any EAs 872 * consuming all of the available space. For new inodes we always reserve 873 * enough space for the kernel's known extended fields, but for inodes 874 * created with an old kernel this might not have been the case. None of 875 * the extended inode fields is critical for correct filesystem operation. 876 * This macro checks if a certain field fits in the inode. Note that 877 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 878 */ 879#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 880 ((offsetof(typeof(*ext4_inode), field) + \ 881 sizeof((ext4_inode)->field)) \ 882 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 883 (einode)->i_extra_isize)) \ 884 885/* 886 * We use an encoding that preserves the times for extra epoch "00": 887 * 888 * extra msb of adjust for signed 889 * epoch 32-bit 32-bit tv_sec to 890 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 891 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 892 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 893 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 894 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 895 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 896 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 897 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 898 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 899 * 900 * Note that previous versions of the kernel on 64-bit systems would 901 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 902 * 1970. e2fsck will correct this, assuming that it is run on the 903 * affected filesystem before 2242. 904 */ 905 906static inline __le32 ext4_encode_extra_time(struct timespec64 ts) 907{ 908 u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK; 909 return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS)); 910} 911 912static inline struct timespec64 ext4_decode_extra_time(__le32 base, 913 __le32 extra) 914{ 915 struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) }; 916 917 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 918 ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 919 ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 920 return ts; 921} 922 923#define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \ 924do { \ 925 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 926 (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \ 927 (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \ 928 } else \ 929 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \ 930} while (0) 931 932#define EXT4_INODE_SET_ATIME(inode, raw_inode) \ 933 EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode)) 934 935#define EXT4_INODE_SET_MTIME(inode, raw_inode) \ 936 EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode)) 937 938#define EXT4_INODE_SET_CTIME(inode, raw_inode) \ 939 EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode)) 940 941#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 942 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 943 EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \ 944 raw_inode, (einode)->xtime) 945 946#define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \ 947 (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \ 948 ext4_decode_extra_time((raw_inode)->xtime, \ 949 (raw_inode)->xtime ## _extra) : \ 950 (struct timespec64) { \ 951 .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \ 952 }) 953 954#define EXT4_INODE_GET_ATIME(inode, raw_inode) \ 955do { \ 956 inode_set_atime_to_ts(inode, \ 957 EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode)); \ 958} while (0) 959 960#define EXT4_INODE_GET_MTIME(inode, raw_inode) \ 961do { \ 962 inode_set_mtime_to_ts(inode, \ 963 EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode)); \ 964} while (0) 965 966#define EXT4_INODE_GET_CTIME(inode, raw_inode) \ 967do { \ 968 inode_set_ctime_to_ts(inode, \ 969 EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \ 970} while (0) 971 972#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 973do { \ 974 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 975 (einode)->xtime = \ 976 EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \ 977 raw_inode); \ 978 else \ 979 (einode)->xtime = (struct timespec64){0, 0}; \ 980} while (0) 981 982#define i_disk_version osd1.linux1.l_i_version 983 984#if defined(__KERNEL__) || defined(__linux__) 985#define i_reserved1 osd1.linux1.l_i_reserved1 986#define i_file_acl_high osd2.linux2.l_i_file_acl_high 987#define i_blocks_high osd2.linux2.l_i_blocks_high 988#define i_uid_low i_uid 989#define i_gid_low i_gid 990#define i_uid_high osd2.linux2.l_i_uid_high 991#define i_gid_high osd2.linux2.l_i_gid_high 992#define i_checksum_lo osd2.linux2.l_i_checksum_lo 993 994#elif defined(__GNU__) 995 996#define i_translator osd1.hurd1.h_i_translator 997#define i_uid_high osd2.hurd2.h_i_uid_high 998#define i_gid_high osd2.hurd2.h_i_gid_high 999#define i_author osd2.hurd2.h_i_author 1000 1001#elif defined(__masix__) 1002 1003#define i_reserved1 osd1.masix1.m_i_reserved1 1004#define i_file_acl_high osd2.masix2.m_i_file_acl_high 1005#define i_reserved2 osd2.masix2.m_i_reserved2 1006 1007#endif /* defined(__KERNEL__) || defined(__linux__) */ 1008 1009#include "extents_status.h" 1010#include "fast_commit.h" 1011 1012/* 1013 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 1014 * 1015 * These are needed to avoid lockdep false positives when we need to 1016 * allocate blocks to the quota inode during ext4_map_blocks(), while 1017 * holding i_data_sem for a normal (non-quota) inode. Since we don't 1018 * do quota tracking for the quota inode, this avoids deadlock (as 1019 * well as infinite recursion, since it isn't turtles all the way 1020 * down...) 1021 * 1022 * I_DATA_SEM_NORMAL - Used for most inodes 1023 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 1024 * where the second inode has larger inode number 1025 * than the first 1026 * I_DATA_SEM_QUOTA - Used for quota inodes only 1027 * I_DATA_SEM_EA - Used for ea_inodes only 1028 */ 1029enum { 1030 I_DATA_SEM_NORMAL = 0, 1031 I_DATA_SEM_OTHER, 1032 I_DATA_SEM_QUOTA, 1033 I_DATA_SEM_EA 1034}; 1035 1036 1037/* 1038 * fourth extended file system inode data in memory 1039 */ 1040struct ext4_inode_info { 1041 __le32 i_data[15]; /* unconverted */ 1042 __u32 i_dtime; 1043 ext4_fsblk_t i_file_acl; 1044 1045 /* 1046 * i_block_group is the number of the block group which contains 1047 * this file's inode. Constant across the lifetime of the inode, 1048 * it is used for making block allocation decisions - we try to 1049 * place a file's data blocks near its inode block, and new inodes 1050 * near to their parent directory's inode. 1051 */ 1052 ext4_group_t i_block_group; 1053 ext4_lblk_t i_dir_start_lookup; 1054#if (BITS_PER_LONG < 64) 1055 unsigned long i_state_flags; /* Dynamic state flags */ 1056#endif 1057 unsigned long i_flags; 1058 1059 /* 1060 * Extended attributes can be read independently of the main file 1061 * data. Taking i_rwsem even when reading would cause contention 1062 * between readers of EAs and writers of regular file data, so 1063 * instead we synchronize on xattr_sem when reading or changing 1064 * EAs. 1065 */ 1066 struct rw_semaphore xattr_sem; 1067 1068 /* 1069 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise 1070 * i_orphan is used. 1071 */ 1072 union { 1073 struct list_head i_orphan; /* unlinked but open inodes */ 1074 unsigned int i_orphan_idx; /* Index in orphan file */ 1075 }; 1076 1077 /* Fast commit related info */ 1078 1079 /* For tracking dentry create updates */ 1080 struct list_head i_fc_dilist; 1081 struct list_head i_fc_list; /* 1082 * inodes that need fast commit 1083 * protected by sbi->s_fc_lock. 1084 */ 1085 1086 /* Start of lblk range that needs to be committed in this fast commit */ 1087 ext4_lblk_t i_fc_lblk_start; 1088 1089 /* End of lblk range that needs to be committed in this fast commit */ 1090 ext4_lblk_t i_fc_lblk_len; 1091 1092 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1093 1094 /* Fast commit wait queue for this inode */ 1095 wait_queue_head_t i_fc_wait; 1096 1097 /* 1098 * Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len 1099 * and inode's EXT4_FC_STATE_COMMITTING state bit. 1100 */ 1101 spinlock_t i_fc_lock; 1102 1103 /* 1104 * i_disksize keeps track of what the inode size is ON DISK, not 1105 * in memory. During truncate, i_size is set to the new size by 1106 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1107 * set i_disksize to 0 until the truncate is actually under way. 1108 * 1109 * The intent is that i_disksize always represents the blocks which 1110 * are used by this file. This allows recovery to restart truncate 1111 * on orphans if we crash during truncate. We actually write i_disksize 1112 * into the on-disk inode when writing inodes out, instead of i_size. 1113 * 1114 * The only time when i_disksize and i_size may be different is when 1115 * a truncate is in progress. The only things which change i_disksize 1116 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1117 */ 1118 loff_t i_disksize; 1119 1120 /* 1121 * i_data_sem is for serialising ext4_truncate() against 1122 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1123 * data tree are chopped off during truncate. We can't do that in 1124 * ext4 because whenever we perform intermediate commits during 1125 * truncate, the inode and all the metadata blocks *must* be in a 1126 * consistent state which allows truncation of the orphans to restart 1127 * during recovery. Hence we must fix the get_block-vs-truncate race 1128 * by other means, so we have i_data_sem. 1129 */ 1130 struct rw_semaphore i_data_sem; 1131 struct inode vfs_inode; 1132 struct jbd2_inode *jinode; 1133 1134 /* 1135 * File creation time. Its function is same as that of 1136 * struct timespec64 i_{a,c,m}time in the generic inode. 1137 */ 1138 struct timespec64 i_crtime; 1139 1140 /* mballoc */ 1141 atomic_t i_prealloc_active; 1142 1143 /* allocation reservation info for delalloc */ 1144 /* In case of bigalloc, this refer to clusters rather than blocks */ 1145 unsigned int i_reserved_data_blocks; 1146 struct rb_root i_prealloc_node; 1147 rwlock_t i_prealloc_lock; 1148 1149 /* extents status tree */ 1150 struct ext4_es_tree i_es_tree; 1151 rwlock_t i_es_lock; 1152 struct list_head i_es_list; 1153 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1154 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1155 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1156 extents to shrink. Protected by 1157 i_es_lock */ 1158 u64 i_es_seq; /* Change counter for extents. 1159 Protected by i_es_lock */ 1160 1161 /* ialloc */ 1162 ext4_group_t i_last_alloc_group; 1163 1164 /* pending cluster reservations for bigalloc file systems */ 1165 struct ext4_pending_tree i_pending_tree; 1166 1167 /* on-disk additional length */ 1168 __u16 i_extra_isize; 1169 1170 /* Indicate the inline data space. */ 1171 u16 i_inline_off; 1172 u16 i_inline_size; 1173 1174#ifdef CONFIG_QUOTA 1175 /* quota space reservation, managed internally by quota code */ 1176 qsize_t i_reserved_quota; 1177#endif 1178 spinlock_t i_block_reservation_lock; 1179 1180 /* Lock protecting lists below */ 1181 spinlock_t i_completed_io_lock; 1182 /* 1183 * Completed IOs that need unwritten extents handling and have 1184 * transaction reserved 1185 */ 1186 struct list_head i_rsv_conversion_list; 1187 struct work_struct i_rsv_conversion_work; 1188 1189 /* 1190 * Transactions that contain inode's metadata needed to complete 1191 * fsync and fdatasync, respectively. 1192 */ 1193 tid_t i_sync_tid; 1194 tid_t i_datasync_tid; 1195 1196#ifdef CONFIG_QUOTA 1197 struct dquot __rcu *i_dquot[MAXQUOTAS]; 1198#endif 1199 1200 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1201 __u32 i_csum_seed; 1202 1203 kprojid_t i_projid; 1204 1205#ifdef CONFIG_FS_ENCRYPTION 1206 struct fscrypt_inode_info *i_crypt_info; 1207#endif 1208 1209#ifdef CONFIG_FS_VERITY 1210 struct fsverity_info *i_verity_info; 1211#endif 1212}; 1213 1214/* 1215 * File system states 1216 */ 1217#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1218#define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1219#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1220#define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1221 1222/* 1223 * Misc. filesystem flags 1224 */ 1225#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1226#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1227#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1228 1229/* 1230 * Mount flags set via mount options or defaults 1231 */ 1232#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1233#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1234#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1235#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1236#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1237#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1238#define EXT4_MOUNT_ERRORS_MASK 0x00070 1239#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1240#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1241#ifdef CONFIG_FS_DAX 1242#define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1243#else 1244#define EXT4_MOUNT_DAX_ALWAYS 0 1245#endif 1246#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1247#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1248#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1249#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1250#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1251#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1252#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1253#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1254#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1255#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1256#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1257#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1258 * enable enforcement for hidden 1259 * quota files */ 1260#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1261 * enforcement for hidden quota 1262 * files */ 1263#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1264 * enforcement */ 1265#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1266#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1267#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1268#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1269#define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1270#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1271#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1272#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1273#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1274#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1275 1276/* 1277 * Mount flags set either automatically (could not be set by mount option) 1278 * based on per file system feature or property or in special cases such as 1279 * distinguishing between explicit mount option definition and default. 1280 */ 1281#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1282 specified delalloc */ 1283#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1284 size of blocksize * 8 1285 blocks */ 1286#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1287 file systems */ 1288#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1289 specified journal checksum */ 1290 1291#define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1292#define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1293#define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1294#define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1295 * scanning in mballoc 1296 */ 1297#define EXT4_MOUNT2_ABORT 0x00000100 /* Abort filesystem */ 1298 1299#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1300 ~EXT4_MOUNT_##opt 1301#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1302 EXT4_MOUNT_##opt 1303#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1304 EXT4_MOUNT_##opt) 1305 1306#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1307 ~EXT4_MOUNT2_##opt 1308#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1309 EXT4_MOUNT2_##opt 1310#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1311 EXT4_MOUNT2_##opt) 1312 1313#define ext4_test_and_set_bit __test_and_set_bit_le 1314#define ext4_set_bit __set_bit_le 1315#define ext4_test_and_clear_bit __test_and_clear_bit_le 1316#define ext4_clear_bit __clear_bit_le 1317#define ext4_test_bit test_bit_le 1318#define ext4_find_next_zero_bit find_next_zero_bit_le 1319#define ext4_find_next_bit find_next_bit_le 1320 1321extern void mb_set_bits(void *bm, int cur, int len); 1322 1323/* 1324 * Maximal mount counts between two filesystem checks 1325 */ 1326#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1327#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1328 1329/* 1330 * Behaviour when detecting errors 1331 */ 1332#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1333#define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1334#define EXT4_ERRORS_PANIC 3 /* Panic */ 1335#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1336 1337/* Metadata checksum algorithm codes */ 1338#define EXT4_CRC32C_CHKSUM 1 1339 1340#define EXT4_LABEL_MAX 16 1341 1342/* 1343 * Structure of the super block 1344 */ 1345struct ext4_super_block { 1346/*00*/ __le32 s_inodes_count; /* Inodes count */ 1347 __le32 s_blocks_count_lo; /* Blocks count */ 1348 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1349 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1350/*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1351 __le32 s_first_data_block; /* First Data Block */ 1352 __le32 s_log_block_size; /* Block size */ 1353 __le32 s_log_cluster_size; /* Allocation cluster size */ 1354/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1355 __le32 s_clusters_per_group; /* # Clusters per group */ 1356 __le32 s_inodes_per_group; /* # Inodes per group */ 1357 __le32 s_mtime; /* Mount time */ 1358/*30*/ __le32 s_wtime; /* Write time */ 1359 __le16 s_mnt_count; /* Mount count */ 1360 __le16 s_max_mnt_count; /* Maximal mount count */ 1361 __le16 s_magic; /* Magic signature */ 1362 __le16 s_state; /* File system state */ 1363 __le16 s_errors; /* Behaviour when detecting errors */ 1364 __le16 s_minor_rev_level; /* minor revision level */ 1365/*40*/ __le32 s_lastcheck; /* time of last check */ 1366 __le32 s_checkinterval; /* max. time between checks */ 1367 __le32 s_creator_os; /* OS */ 1368 __le32 s_rev_level; /* Revision level */ 1369/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1370 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1371 /* 1372 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1373 * 1374 * Note: the difference between the compatible feature set and 1375 * the incompatible feature set is that if there is a bit set 1376 * in the incompatible feature set that the kernel doesn't 1377 * know about, it should refuse to mount the filesystem. 1378 * 1379 * e2fsck's requirements are more strict; if it doesn't know 1380 * about a feature in either the compatible or incompatible 1381 * feature set, it must abort and not try to meddle with 1382 * things it doesn't understand... 1383 */ 1384 __le32 s_first_ino; /* First non-reserved inode */ 1385 __le16 s_inode_size; /* size of inode structure */ 1386 __le16 s_block_group_nr; /* block group # of this superblock */ 1387 __le32 s_feature_compat; /* compatible feature set */ 1388/*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1389 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1390/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1391/*78*/ char s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */ 1392/*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1393/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1394 /* 1395 * Performance hints. Directory preallocation should only 1396 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1397 */ 1398 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1399 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1400 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1401 /* 1402 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1403 */ 1404/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1405/*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1406 __le32 s_journal_dev; /* device number of journal file */ 1407 __le32 s_last_orphan; /* start of list of inodes to delete */ 1408 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1409 __u8 s_def_hash_version; /* Default hash version to use */ 1410 __u8 s_jnl_backup_type; 1411 __le16 s_desc_size; /* size of group descriptor */ 1412/*100*/ __le32 s_default_mount_opts; 1413 __le32 s_first_meta_bg; /* First metablock block group */ 1414 __le32 s_mkfs_time; /* When the filesystem was created */ 1415 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1416 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */ 1417/*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1418 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1419 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1420 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1421 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1422 __le32 s_flags; /* Miscellaneous flags */ 1423 __le16 s_raid_stride; /* RAID stride */ 1424 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1425 __le64 s_mmp_block; /* Block for multi-mount protection */ 1426 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1427 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1428 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1429 __u8 s_encryption_level; /* versioning level for encryption */ 1430 __u8 s_reserved_pad; /* Padding to next 32bits */ 1431 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1432 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1433 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1434 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1435 snapshot's future use */ 1436 __le32 s_snapshot_list; /* inode number of the head of the 1437 on-disk snapshot list */ 1438#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1439 __le32 s_error_count; /* number of fs errors */ 1440 __le32 s_first_error_time; /* first time an error happened */ 1441 __le32 s_first_error_ino; /* inode involved in first error */ 1442 __le64 s_first_error_block; /* block involved of first error */ 1443 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1444 __le32 s_first_error_line; /* line number where error happened */ 1445 __le32 s_last_error_time; /* most recent time of an error */ 1446 __le32 s_last_error_ino; /* inode involved in last error */ 1447 __le32 s_last_error_line; /* line number where error happened */ 1448 __le64 s_last_error_block; /* block involved of last error */ 1449 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1450#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1451 __u8 s_mount_opts[64]; 1452 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1453 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1454 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1455 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1456 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1457 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1458 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1459 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1460 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1461 __u8 s_wtime_hi; 1462 __u8 s_mtime_hi; 1463 __u8 s_mkfs_time_hi; 1464 __u8 s_lastcheck_hi; 1465 __u8 s_first_error_time_hi; 1466 __u8 s_last_error_time_hi; 1467 __u8 s_first_error_errcode; 1468 __u8 s_last_error_errcode; 1469 __le16 s_encoding; /* Filename charset encoding */ 1470 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1471 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ 1472 __le16 s_def_resuid_hi; 1473 __le16 s_def_resgid_hi; 1474 __le32 s_reserved[93]; /* Padding to the end of the block */ 1475 __le32 s_checksum; /* crc32c(superblock) */ 1476}; 1477 1478#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1479 1480#ifdef __KERNEL__ 1481 1482/* Number of quota types we support */ 1483#define EXT4_MAXQUOTAS 3 1484 1485#define EXT4_ENC_UTF8_12_1 1 1486 1487/* Types of ext4 journal triggers */ 1488enum ext4_journal_trigger_type { 1489 EXT4_JTR_ORPHAN_FILE, 1490 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ 1491}; 1492 1493#define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE 1494 1495struct ext4_journal_trigger { 1496 struct jbd2_buffer_trigger_type tr_triggers; 1497 struct super_block *sb; 1498}; 1499 1500static inline struct ext4_journal_trigger *EXT4_TRIGGER( 1501 struct jbd2_buffer_trigger_type *trigger) 1502{ 1503 return container_of(trigger, struct ext4_journal_trigger, tr_triggers); 1504} 1505 1506#define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 1507 1508/* Structure at the tail of orphan block */ 1509struct ext4_orphan_block_tail { 1510 __le32 ob_magic; 1511 __le32 ob_checksum; 1512}; 1513 1514static inline int ext4_inodes_per_orphan_block(struct super_block *sb) 1515{ 1516 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / 1517 sizeof(u32); 1518} 1519 1520struct ext4_orphan_block { 1521 atomic_t ob_free_entries; /* Number of free orphan entries in block */ 1522 struct buffer_head *ob_bh; /* Buffer for orphan block */ 1523}; 1524 1525/* 1526 * Info about orphan file. 1527 */ 1528struct ext4_orphan_info { 1529 int of_blocks; /* Number of orphan blocks in a file */ 1530 __u32 of_csum_seed; /* Checksum seed for orphan file */ 1531 struct ext4_orphan_block *of_binfo; /* Array with info about orphan 1532 * file blocks */ 1533}; 1534 1535/* 1536 * fourth extended-fs super-block data in memory 1537 */ 1538struct ext4_sb_info { 1539 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1540 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1541 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1542 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1543 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1544 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1545 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1546 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1547 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1548 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1549 unsigned long s_overhead; /* # of fs overhead clusters */ 1550 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1551 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1552 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1553 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1554 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1555 /* Array of bh's for the block group descriptors */ 1556 struct buffer_head * __rcu *s_group_desc; 1557 unsigned int s_mount_opt; 1558 unsigned int s_mount_opt2; 1559 unsigned long s_mount_flags; 1560 unsigned int s_def_mount_opt; 1561 unsigned int s_def_mount_opt2; 1562 ext4_fsblk_t s_sb_block; 1563 atomic64_t s_resv_clusters; 1564 kuid_t s_resuid; 1565 kgid_t s_resgid; 1566 unsigned short s_mount_state; 1567 unsigned short s_pad; 1568 int s_addr_per_block_bits; 1569 int s_desc_per_block_bits; 1570 int s_inode_size; 1571 int s_first_ino; 1572 unsigned int s_inode_readahead_blks; 1573 unsigned int s_inode_goal; 1574 u32 s_hash_seed[4]; 1575 int s_def_hash_version; 1576 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1577 struct percpu_counter s_freeclusters_counter; 1578 struct percpu_counter s_freeinodes_counter; 1579 struct percpu_counter s_dirs_counter; 1580 struct percpu_counter s_dirtyclusters_counter; 1581 struct percpu_counter s_sra_exceeded_retry_limit; 1582 struct blockgroup_lock *s_blockgroup_lock; 1583 struct proc_dir_entry *s_proc; 1584 struct kobject s_kobj; 1585 struct completion s_kobj_unregister; 1586 struct mutex s_error_notify_mutex; /* protects sysfs_notify vs kobject_del */ 1587 struct super_block *s_sb; 1588 struct buffer_head *s_mmp_bh; 1589 1590 /* Journaling */ 1591 struct journal_s *s_journal; 1592 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1593 struct mutex s_orphan_lock; /* Protects on disk list changes */ 1594 struct list_head s_orphan; /* List of orphaned inodes in on disk 1595 list */ 1596 struct ext4_orphan_info s_orphan_info; 1597 unsigned long s_commit_interval; 1598 u32 s_max_batch_time; 1599 u32 s_min_batch_time; 1600 struct file *s_journal_bdev_file; 1601#ifdef CONFIG_QUOTA 1602 /* Names of quota files with journalled quota */ 1603 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1604 int s_jquota_fmt; /* Format of quota to use */ 1605#endif 1606 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1607 struct ext4_system_blocks __rcu *s_system_blks; 1608 1609#ifdef EXTENTS_STATS 1610 /* ext4 extents stats */ 1611 unsigned long s_ext_min; 1612 unsigned long s_ext_max; 1613 unsigned long s_depth_max; 1614 spinlock_t s_ext_stats_lock; 1615 unsigned long s_ext_blocks; 1616 unsigned long s_ext_extents; 1617#endif 1618 1619 /* for buddy allocator */ 1620 struct ext4_group_info ** __rcu *s_group_info; 1621 struct inode *s_buddy_cache; 1622 spinlock_t s_md_lock; 1623 unsigned short *s_mb_offsets; 1624 unsigned int *s_mb_maxs; 1625 unsigned int s_group_info_size; 1626 atomic_t s_mb_free_pending; 1627 struct list_head s_freed_data_list[2]; /* List of blocks to be freed 1628 after commit completed */ 1629 struct list_head s_discard_list; 1630 struct work_struct s_discard_work; 1631 atomic_t s_retry_alloc_pending; 1632 struct xarray *s_mb_avg_fragment_size; 1633 struct xarray *s_mb_largest_free_orders; 1634 1635 /* tunables */ 1636 unsigned long s_stripe; 1637 unsigned int s_mb_max_linear_groups; 1638 unsigned int s_mb_stream_request; 1639 unsigned int s_mb_max_to_scan; 1640 unsigned int s_mb_min_to_scan; 1641 unsigned int s_mb_stats; 1642 unsigned int s_mb_order2_reqs; 1643 unsigned int s_mb_group_prealloc; 1644 unsigned int s_max_dir_size_kb; 1645 unsigned int s_mb_prefetch; 1646 unsigned int s_mb_prefetch_limit; 1647 unsigned int s_mb_best_avail_max_trim_order; 1648 unsigned int s_sb_update_sec; 1649 unsigned int s_sb_update_kb; 1650 1651 /* where last allocation was done - for stream allocation */ 1652 ext4_group_t *s_mb_last_groups; 1653 unsigned int s_mb_nr_global_goals; 1654 1655 /* stats for buddy allocator */ 1656 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1657 atomic_t s_bal_success; /* we found long enough chunks */ 1658 atomic_t s_bal_allocated; /* in blocks */ 1659 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1660 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */ 1661 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1662 atomic_t s_bal_goals; /* goal hits */ 1663 atomic_t s_bal_stream_goals; /* stream allocation global goal hits */ 1664 atomic_t s_bal_len_goals; /* len goal hits */ 1665 atomic_t s_bal_breaks; /* too long searches */ 1666 atomic_t s_bal_2orders; /* 2^order hits */ 1667 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS]; 1668 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS]; 1669 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */ 1670 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1671 atomic64_t s_mb_generation_time; 1672 atomic_t s_mb_lost_chunks; 1673 atomic_t s_mb_preallocated; 1674 atomic_t s_mb_discarded; 1675 atomic_t s_lock_busy; 1676 1677 /* locality groups */ 1678 struct ext4_locality_group __percpu *s_locality_groups; 1679 1680 /* for write statistics */ 1681 unsigned long s_sectors_written_start; 1682 u64 s_kbytes_written; 1683 1684 /* the size of zero-out chunk */ 1685 unsigned int s_extent_max_zeroout_kb; 1686 1687 unsigned int s_log_groups_per_flex; 1688 struct flex_groups * __rcu *s_flex_groups; 1689 ext4_group_t s_flex_groups_allocated; 1690 1691 /* workqueue for reserved extent conversions (buffered io) */ 1692 struct workqueue_struct *rsv_conversion_wq; 1693 1694 /* timer for periodic error stats printing */ 1695 struct timer_list s_err_report; 1696 1697 /* Lazy inode table initialization info */ 1698 struct ext4_li_request *s_li_request; 1699 /* Wait multiplier for lazy initialization thread */ 1700 unsigned int s_li_wait_mult; 1701 1702 /* Kernel thread for multiple mount protection */ 1703 struct task_struct *s_mmp_tsk; 1704 1705 /* record the last minlen when FITRIM is called. */ 1706 unsigned long s_last_trim_minblks; 1707 1708 /* minimum folio order of a page cache allocation */ 1709 u16 s_min_folio_order; 1710 /* supported maximum folio order, 0 means not supported */ 1711 u16 s_max_folio_order; 1712 1713 /* Precomputed FS UUID checksum for seeding other checksums */ 1714 __u32 s_csum_seed; 1715 1716 /* Reclaim extents from extent status tree */ 1717 struct shrinker *s_es_shrinker; 1718 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1719 long s_es_nr_inode; 1720 struct ext4_es_stats s_es_stats; 1721 struct mb_cache *s_ea_block_cache; 1722 struct mb_cache *s_ea_inode_cache; 1723 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1724 1725 /* Journal triggers for checksum computation */ 1726 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; 1727 1728 /* Ratelimit ext4 messages. */ 1729 struct ratelimit_state s_err_ratelimit_state; 1730 struct ratelimit_state s_warning_ratelimit_state; 1731 struct ratelimit_state s_msg_ratelimit_state; 1732 atomic_t s_warning_count; 1733 atomic_t s_msg_count; 1734 1735 /* Encryption policy for '-o test_dummy_encryption' */ 1736 struct fscrypt_dummy_policy s_dummy_enc_policy; 1737 1738 /* 1739 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1740 * or EXTENTS flag or between writepages ops and changing DELALLOC or 1741 * DIOREAD_NOLOCK mount options on remount. 1742 */ 1743 struct percpu_rw_semaphore s_writepages_rwsem; 1744 struct dax_device *s_daxdev; 1745 u64 s_dax_part_off; 1746#ifdef CONFIG_EXT4_DEBUG 1747 unsigned long s_simulate_fail; 1748#endif 1749 /* Record the errseq of the backing block device */ 1750 errseq_t s_bdev_wb_err; 1751 spinlock_t s_bdev_wb_lock; 1752 1753 /* Information about errors that happened during this mount */ 1754 spinlock_t s_error_lock; 1755 int s_add_error_count; 1756 int s_first_error_code; 1757 __u32 s_first_error_line; 1758 __u32 s_first_error_ino; 1759 __u64 s_first_error_block; 1760 const char *s_first_error_func; 1761 time64_t s_first_error_time; 1762 int s_last_error_code; 1763 __u32 s_last_error_line; 1764 __u32 s_last_error_ino; 1765 __u64 s_last_error_block; 1766 const char *s_last_error_func; 1767 time64_t s_last_error_time; 1768 /* 1769 * If we are in a context where we cannot update the on-disk 1770 * superblock, we queue the work here. This is used to update 1771 * the error information in the superblock, and for periodic 1772 * updates of the superblock called from the commit callback 1773 * function. 1774 */ 1775 struct work_struct s_sb_upd_work; 1776 1777 /* Atomic write unit values in bytes */ 1778 unsigned int s_awu_min; 1779 unsigned int s_awu_max; 1780 1781 /* Ext4 fast commit sub transaction ID */ 1782 atomic_t s_fc_subtid; 1783 1784 /* 1785 * After commit starts, the main queue gets locked, and the further 1786 * updates get added in the staging queue. 1787 */ 1788#define FC_Q_MAIN 0 1789#define FC_Q_STAGING 1 1790 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1791 * that have data changes in them. 1792 */ 1793 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1794 unsigned int s_fc_bytes; 1795 /* 1796 * Main fast commit lock. This lock protects accesses to the 1797 * following fields: 1798 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1799 * 1800 * s_fc_lock can be taken from reclaim context (inode eviction) and is 1801 * thus reclaim unsafe. Use ext4_fc_lock()/ext4_fc_unlock() helpers 1802 * when acquiring / releasing the lock. 1803 */ 1804 struct mutex s_fc_lock; 1805 struct buffer_head *s_fc_bh; 1806 struct ext4_fc_stats s_fc_stats; 1807 tid_t s_fc_ineligible_tid; 1808#ifdef CONFIG_EXT4_DEBUG 1809 int s_fc_debug_max_replay; 1810#endif 1811 struct ext4_fc_replay_state s_fc_replay_state; 1812}; 1813 1814static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1815{ 1816 return sb->s_fs_info; 1817} 1818static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1819{ 1820 return container_of(inode, struct ext4_inode_info, vfs_inode); 1821} 1822 1823static inline int ext4_writepages_down_read(struct super_block *sb) 1824{ 1825 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem); 1826 return memalloc_nofs_save(); 1827} 1828 1829static inline void ext4_writepages_up_read(struct super_block *sb, int ctx) 1830{ 1831 memalloc_nofs_restore(ctx); 1832 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem); 1833} 1834 1835static inline int ext4_writepages_down_write(struct super_block *sb) 1836{ 1837 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem); 1838 return memalloc_nofs_save(); 1839} 1840 1841static inline void ext4_writepages_up_write(struct super_block *sb, int ctx) 1842{ 1843 memalloc_nofs_restore(ctx); 1844 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem); 1845} 1846 1847static inline int ext4_fc_lock(struct super_block *sb) 1848{ 1849 mutex_lock(&EXT4_SB(sb)->s_fc_lock); 1850 return memalloc_nofs_save(); 1851} 1852 1853static inline void ext4_fc_unlock(struct super_block *sb, int ctx) 1854{ 1855 memalloc_nofs_restore(ctx); 1856 mutex_unlock(&EXT4_SB(sb)->s_fc_lock); 1857} 1858 1859static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1860{ 1861 return ino == EXT4_ROOT_INO || 1862 (ino >= EXT4_FIRST_INO(sb) && 1863 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1864} 1865 1866static inline int ext4_get_resuid(struct ext4_super_block *es) 1867{ 1868 return le16_to_cpu(es->s_def_resuid) | 1869 le16_to_cpu(es->s_def_resuid_hi) << 16; 1870} 1871 1872static inline int ext4_get_resgid(struct ext4_super_block *es) 1873{ 1874 return le16_to_cpu(es->s_def_resgid) | 1875 le16_to_cpu(es->s_def_resgid_hi) << 16; 1876} 1877 1878/* 1879 * Returns: sbi->field[index] 1880 * Used to access an array element from the following sbi fields which require 1881 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1882 * - s_group_desc 1883 * - s_group_info 1884 * - s_flex_group 1885 */ 1886#define sbi_array_rcu_deref(sbi, field, index) \ 1887({ \ 1888 typeof(*((sbi)->field)) _v; \ 1889 rcu_read_lock(); \ 1890 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1891 rcu_read_unlock(); \ 1892 _v; \ 1893}) 1894 1895/* 1896 * run-time mount flags 1897 */ 1898enum { 1899 EXT4_MF_MNTDIR_SAMPLED, 1900 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ 1901 EXT4_MF_JOURNAL_DESTROY /* Journal is in process of destroying */ 1902}; 1903 1904static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1905{ 1906 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1907} 1908 1909static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1910{ 1911 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1912} 1913 1914static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1915{ 1916 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1917} 1918 1919 1920/* 1921 * Simulate_fail codes 1922 */ 1923#define EXT4_SIM_BBITMAP_EIO 1 1924#define EXT4_SIM_BBITMAP_CRC 2 1925#define EXT4_SIM_IBITMAP_EIO 3 1926#define EXT4_SIM_IBITMAP_CRC 4 1927#define EXT4_SIM_INODE_EIO 5 1928#define EXT4_SIM_INODE_CRC 6 1929#define EXT4_SIM_DIRBLOCK_EIO 7 1930#define EXT4_SIM_DIRBLOCK_CRC 8 1931 1932static inline bool ext4_simulate_fail(struct super_block *sb, 1933 unsigned long code) 1934{ 1935#ifdef CONFIG_EXT4_DEBUG 1936 struct ext4_sb_info *sbi = EXT4_SB(sb); 1937 1938 if (unlikely(sbi->s_simulate_fail == code)) { 1939 sbi->s_simulate_fail = 0; 1940 return true; 1941 } 1942#endif 1943 return false; 1944} 1945 1946/* 1947 * Error number codes for s_{first,last}_error_errno 1948 * 1949 * Linux errno numbers are architecture specific, so we need to translate 1950 * them into something which is architecture independent. We don't define 1951 * codes for all errno's; just the ones which are most likely to be the cause 1952 * of an ext4_error() call. 1953 */ 1954#define EXT4_ERR_UNKNOWN 1 1955#define EXT4_ERR_EIO 2 1956#define EXT4_ERR_ENOMEM 3 1957#define EXT4_ERR_EFSBADCRC 4 1958#define EXT4_ERR_EFSCORRUPTED 5 1959#define EXT4_ERR_ENOSPC 6 1960#define EXT4_ERR_ENOKEY 7 1961#define EXT4_ERR_EROFS 8 1962#define EXT4_ERR_EFBIG 9 1963#define EXT4_ERR_EEXIST 10 1964#define EXT4_ERR_ERANGE 11 1965#define EXT4_ERR_EOVERFLOW 12 1966#define EXT4_ERR_EBUSY 13 1967#define EXT4_ERR_ENOTDIR 14 1968#define EXT4_ERR_ENOTEMPTY 15 1969#define EXT4_ERR_ESHUTDOWN 16 1970#define EXT4_ERR_EFAULT 17 1971 1972/* 1973 * Inode dynamic state flags 1974 */ 1975enum { 1976 EXT4_STATE_NEW, /* inode is newly created */ 1977 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1978 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1979 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1980 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1981 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1982 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1983 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1984 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1985 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1986 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1987 EXT4_STATE_FC_FLUSHING_DATA, /* Fast commit flushing data */ 1988 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ 1989}; 1990 1991#define EXT4_INODE_BIT_FNS(name, field, offset) \ 1992static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1993{ \ 1994 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1995} \ 1996static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1997{ \ 1998 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1999} \ 2000static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 2001{ \ 2002 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 2003} 2004 2005/* Add these declarations here only so that these functions can be 2006 * found by name. Otherwise, they are very hard to locate. */ 2007static inline int ext4_test_inode_flag(struct inode *inode, int bit); 2008static inline void ext4_set_inode_flag(struct inode *inode, int bit); 2009static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 2010EXT4_INODE_BIT_FNS(flag, flags, 0) 2011 2012/* Add these declarations here only so that these functions can be 2013 * found by name. Otherwise, they are very hard to locate. */ 2014static inline int ext4_test_inode_state(struct inode *inode, int bit); 2015static inline void ext4_set_inode_state(struct inode *inode, int bit); 2016static inline void ext4_clear_inode_state(struct inode *inode, int bit); 2017#if (BITS_PER_LONG < 64) 2018EXT4_INODE_BIT_FNS(state, state_flags, 0) 2019 2020static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 2021{ 2022 (ei)->i_state_flags = 0; 2023} 2024#else 2025EXT4_INODE_BIT_FNS(state, flags, 32) 2026 2027static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 2028{ 2029 /* We depend on the fact that callers will set i_flags */ 2030} 2031#endif 2032#else 2033/* Assume that user mode programs are passing in an ext4fs superblock, not 2034 * a kernel struct super_block. This will allow us to call the feature-test 2035 * macros from user land. */ 2036#define EXT4_SB(sb) (sb) 2037#endif 2038 2039static inline bool ext4_verity_in_progress(struct inode *inode) 2040{ 2041 return IS_ENABLED(CONFIG_FS_VERITY) && 2042 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 2043} 2044 2045#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 2046 2047/* 2048 * Check whether the inode is tracked as orphan (either in orphan file or 2049 * orphan list). 2050 */ 2051static inline bool ext4_inode_orphan_tracked(struct inode *inode) 2052{ 2053 return ext4_test_inode_state(inode, EXT4_STATE_ORPHAN_FILE) || 2054 !list_empty(&EXT4_I(inode)->i_orphan); 2055} 2056 2057/* 2058 * Codes for operating systems 2059 */ 2060#define EXT4_OS_LINUX 0 2061#define EXT4_OS_HURD 1 2062#define EXT4_OS_MASIX 2 2063#define EXT4_OS_FREEBSD 3 2064#define EXT4_OS_LITES 4 2065 2066/* 2067 * Revision levels 2068 */ 2069#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 2070#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 2071 2072#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 2073 2074#define EXT4_GOOD_OLD_INODE_SIZE 128 2075 2076#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 2077#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 2078#define EXT4_TIMESTAMP_MIN S32_MIN 2079 2080/* 2081 * Feature set definitions 2082 */ 2083 2084#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 2085#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 2086#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 2087#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 2088#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 2089#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 2090#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 2091/* 2092 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 2093 * incompatible only if fast commit blocks are present in the FS. Since we 2094 * clear the journal (and thus the fast commit blocks), we don't mark FS as 2095 * incompatible. We also have a JBD2 incompat feature, which gets set when 2096 * there are fast commit blocks present in the journal. 2097 */ 2098#define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 2099#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 2100#define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ 2101 2102#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 2103#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 2104#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 2105#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 2106#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 2107#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 2108#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 2109#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 2110#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 2111/* 2112 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 2113 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 2114 * all other data structures' checksums. However, the METADATA_CSUM and 2115 * GDT_CSUM bits are mutually exclusive. 2116 */ 2117#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 2118#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 2119#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 2120#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 2121#define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be 2122 non-empty */ 2123 2124#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 2125#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 2126#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 2127#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 2128#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 2129#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 2130#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 2131#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 2132#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 2133#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 2134#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 2135#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 2136#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 2137#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 2138#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 2139#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 2140 2141extern void ext4_update_dynamic_rev(struct super_block *sb); 2142 2143#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 2144static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2145{ \ 2146 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2147 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 2148} \ 2149static inline void ext4_set_feature_##name(struct super_block *sb) \ 2150{ \ 2151 ext4_update_dynamic_rev(sb); \ 2152 EXT4_SB(sb)->s_es->s_feature_compat |= \ 2153 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2154} \ 2155static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2156{ \ 2157 EXT4_SB(sb)->s_es->s_feature_compat &= \ 2158 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2159} 2160 2161#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2162static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2163{ \ 2164 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2165 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2166} \ 2167static inline void ext4_set_feature_##name(struct super_block *sb) \ 2168{ \ 2169 ext4_update_dynamic_rev(sb); \ 2170 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2171 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2172} \ 2173static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2174{ \ 2175 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2176 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2177} 2178 2179#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2180static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2181{ \ 2182 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2183 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2184} \ 2185static inline void ext4_set_feature_##name(struct super_block *sb) \ 2186{ \ 2187 ext4_update_dynamic_rev(sb); \ 2188 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2189 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2190} \ 2191static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2192{ \ 2193 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2194 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2195} 2196 2197EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2198EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2199EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2200EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2201EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2202EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2203EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2204EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2205EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2206EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) 2207 2208EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2209EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2210EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2211EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2212EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2213EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2214EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2215EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2216EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2217EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2218EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2219EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2220EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2221EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) 2222 2223EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2224EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2225EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2226EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2227EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2228EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2229EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2230EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2231EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2232EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2233EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2234EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2235EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2236EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2237EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2238EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2239 2240#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2241#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2242 EXT4_FEATURE_INCOMPAT_META_BG) 2243#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2244 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2245 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2246 2247#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2248#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2249 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2250 EXT4_FEATURE_INCOMPAT_META_BG) 2251#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2252 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2253 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2254 2255#define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ 2256 EXT4_FEATURE_COMPAT_ORPHAN_FILE) 2257#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2258 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2259 EXT4_FEATURE_INCOMPAT_META_BG| \ 2260 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2261 EXT4_FEATURE_INCOMPAT_64BIT| \ 2262 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2263 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2264 EXT4_FEATURE_INCOMPAT_MMP | \ 2265 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2266 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2267 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2268 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2269 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2270#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2271 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2272 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2273 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2274 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2275 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2276 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2277 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2278 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2279 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2280 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2281 EXT4_FEATURE_RO_COMPAT_VERITY |\ 2282 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) 2283 2284#define EXTN_FEATURE_FUNCS(ver) \ 2285static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2286{ \ 2287 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2288 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2289} \ 2290static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2291{ \ 2292 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2293 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2294} \ 2295static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2296{ \ 2297 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2298 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2299} 2300 2301EXTN_FEATURE_FUNCS(2) 2302EXTN_FEATURE_FUNCS(3) 2303EXTN_FEATURE_FUNCS(4) 2304 2305static inline bool ext4_has_compat_features(struct super_block *sb) 2306{ 2307 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2308} 2309static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2310{ 2311 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2312} 2313static inline bool ext4_has_incompat_features(struct super_block *sb) 2314{ 2315 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2316} 2317 2318extern int ext4_feature_set_ok(struct super_block *sb, int readonly); 2319 2320/* 2321 * Superblock flags 2322 */ 2323enum { 2324 EXT4_FLAGS_RESIZING, /* Avoid superblock update and resize race */ 2325 EXT4_FLAGS_SHUTDOWN, /* Prevent access to the file system */ 2326 EXT4_FLAGS_BDEV_IS_DAX, /* Current block device support DAX */ 2327 EXT4_FLAGS_EMERGENCY_RO,/* Emergency read-only due to fs errors */ 2328}; 2329 2330static inline int ext4_forced_shutdown(struct super_block *sb) 2331{ 2332 return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags); 2333} 2334 2335static inline int ext4_emergency_ro(struct super_block *sb) 2336{ 2337 return test_bit(EXT4_FLAGS_EMERGENCY_RO, &EXT4_SB(sb)->s_ext4_flags); 2338} 2339 2340static inline int ext4_emergency_state(struct super_block *sb) 2341{ 2342 if (unlikely(ext4_forced_shutdown(sb))) 2343 return -EIO; 2344 if (unlikely(ext4_emergency_ro(sb))) 2345 return -EROFS; 2346 return 0; 2347} 2348 2349/* 2350 * Default values for user and/or group using reserved blocks 2351 */ 2352#define EXT4_DEF_RESUID 0 2353#define EXT4_DEF_RESGID 0 2354 2355/* 2356 * Default project ID 2357 */ 2358#define EXT4_DEF_PROJID 0 2359 2360#define EXT4_DEF_INODE_READAHEAD_BLKS 32 2361 2362/* 2363 * Default mount options 2364 */ 2365#define EXT4_DEFM_DEBUG 0x0001 2366#define EXT4_DEFM_BSDGROUPS 0x0002 2367#define EXT4_DEFM_XATTR_USER 0x0004 2368#define EXT4_DEFM_ACL 0x0008 2369#define EXT4_DEFM_UID16 0x0010 2370#define EXT4_DEFM_JMODE 0x0060 2371#define EXT4_DEFM_JMODE_DATA 0x0020 2372#define EXT4_DEFM_JMODE_ORDERED 0x0040 2373#define EXT4_DEFM_JMODE_WBACK 0x0060 2374#define EXT4_DEFM_NOBARRIER 0x0100 2375#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2376#define EXT4_DEFM_DISCARD 0x0400 2377#define EXT4_DEFM_NODELALLOC 0x0800 2378 2379/* 2380 * Default journal batch times and ioprio. 2381 */ 2382#define EXT4_DEF_MIN_BATCH_TIME 0 2383#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2384#define EXT4_DEF_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 2385 2386 2387/* 2388 * Default values for superblock update 2389 */ 2390#define EXT4_DEF_SB_UPDATE_INTERVAL_SEC (3600) /* seconds (1 hour) */ 2391#define EXT4_DEF_SB_UPDATE_INTERVAL_KB (16384) /* kilobytes (16MB) */ 2392 2393 2394/* 2395 * Minimum number of groups in a flexgroup before we separate out 2396 * directories into the first block group of a flexgroup 2397 */ 2398#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2399 2400/* 2401 * Structure of a directory entry 2402 */ 2403#define EXT4_NAME_LEN 255 2404/* 2405 * Base length of the ext4 directory entry excluding the name length 2406 */ 2407#define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) 2408 2409struct ext4_dir_entry { 2410 __le32 inode; /* Inode number */ 2411 __le16 rec_len; /* Directory entry length */ 2412 __le16 name_len; /* Name length */ 2413 char name[EXT4_NAME_LEN]; /* File name */ 2414}; 2415 2416 2417/* 2418 * Encrypted Casefolded entries require saving the hash on disk. This structure 2419 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2420 * boundary. 2421 */ 2422struct ext4_dir_entry_hash { 2423 __le32 hash; 2424 __le32 minor_hash; 2425}; 2426 2427/* 2428 * The new version of the directory entry. Since EXT4 structures are 2429 * stored in intel byte order, and the name_len field could never be 2430 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2431 * file_type field. 2432 */ 2433struct ext4_dir_entry_2 { 2434 __le32 inode; /* Inode number */ 2435 __le16 rec_len; /* Directory entry length */ 2436 __u8 name_len; /* Name length */ 2437 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2438 char name[EXT4_NAME_LEN]; /* File name */ 2439}; 2440 2441/* 2442 * Access the hashes at the end of ext4_dir_entry_2 2443 */ 2444#define EXT4_DIRENT_HASHES(entry) \ 2445 ((struct ext4_dir_entry_hash *) \ 2446 (((void *)(entry)) + \ 2447 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2448#define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(entry)->hash) 2449#define EXT4_DIRENT_MINOR_HASH(entry) \ 2450 le32_to_cpu(EXT4_DIRENT_HASHES(entry)->minor_hash) 2451 2452static inline bool ext4_hash_in_dirent(const struct inode *inode) 2453{ 2454 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2455} 2456 2457/* 2458 * This is a bogus directory entry at the end of each leaf block that 2459 * records checksums. 2460 */ 2461struct ext4_dir_entry_tail { 2462 __le32 det_reserved_zero1; /* Pretend to be unused */ 2463 __le16 det_rec_len; /* 12 */ 2464 __u8 det_reserved_zero2; /* Zero name length */ 2465 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2466 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2467}; 2468 2469#define EXT4_DIRENT_TAIL(block, blocksize) \ 2470 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2471 ((blocksize) - \ 2472 sizeof(struct ext4_dir_entry_tail)))) 2473 2474/* 2475 * Ext4 directory file types. Only the low 3 bits are used. The 2476 * other bits are reserved for now. 2477 */ 2478#define EXT4_FT_UNKNOWN 0 2479#define EXT4_FT_REG_FILE 1 2480#define EXT4_FT_DIR 2 2481#define EXT4_FT_CHRDEV 3 2482#define EXT4_FT_BLKDEV 4 2483#define EXT4_FT_FIFO 5 2484#define EXT4_FT_SOCK 6 2485#define EXT4_FT_SYMLINK 7 2486 2487#define EXT4_FT_MAX 8 2488 2489#define EXT4_FT_DIR_CSUM 0xDE 2490 2491/* 2492 * EXT4_DIR_PAD defines the directory entries boundaries 2493 * 2494 * NOTE: It must be a multiple of 4 2495 */ 2496#define EXT4_DIR_PAD 4 2497#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2498#define EXT4_MAX_REC_LEN ((1<<16)-1) 2499 2500/* 2501 * The rec_len is dependent on the type of directory. Directories that are 2502 * casefolded and encrypted need to store the hash as well, so we add room for 2503 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2504 * pass NULL for dir, as those entries do not use the extra fields. 2505 */ 2506static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2507 const struct inode *dir) 2508{ 2509 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2510 2511 if (dir && ext4_hash_in_dirent(dir)) 2512 rec_len += sizeof(struct ext4_dir_entry_hash); 2513 return (rec_len & ~EXT4_DIR_ROUND); 2514} 2515 2516static inline unsigned int 2517ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2518{ 2519 unsigned len = le16_to_cpu(dlen); 2520 2521 if (len == EXT4_MAX_REC_LEN || len == 0) 2522 return blocksize; 2523 return (len & 65532) | ((len & 3) << 16); 2524} 2525 2526static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2527{ 2528 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); 2529 if (len < 65536) 2530 return cpu_to_le16(len); 2531 if (len == blocksize) { 2532 if (blocksize == 65536) 2533 return cpu_to_le16(EXT4_MAX_REC_LEN); 2534 else 2535 return cpu_to_le16(0); 2536 } 2537 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2538} 2539 2540/* 2541 * Hash Tree Directory indexing 2542 * (c) Daniel Phillips, 2001 2543 */ 2544 2545#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2546 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2547#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2548 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2549#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2550 2551/* Legal values for the dx_root hash_version field: */ 2552 2553#define DX_HASH_LEGACY 0 2554#define DX_HASH_HALF_MD4 1 2555#define DX_HASH_TEA 2 2556#define DX_HASH_LEGACY_UNSIGNED 3 2557#define DX_HASH_HALF_MD4_UNSIGNED 4 2558#define DX_HASH_TEA_UNSIGNED 5 2559#define DX_HASH_SIPHASH 6 2560#define DX_HASH_LAST DX_HASH_SIPHASH 2561 2562static inline u32 ext4_chksum(u32 crc, const void *address, unsigned int length) 2563{ 2564 return crc32c(crc, address, length); 2565} 2566 2567#ifdef __KERNEL__ 2568 2569/* hash info structure used by the directory hash */ 2570struct dx_hash_info 2571{ 2572 u32 hash; 2573 u32 minor_hash; 2574 int hash_version; 2575 u32 *seed; 2576}; 2577 2578 2579/* 32 and 64 bit signed EOF for dx directories */ 2580#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2581#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2582 2583 2584/* 2585 * Control parameters used by ext4_htree_next_block 2586 */ 2587#define HASH_NB_ALWAYS 1 2588 2589struct ext4_filename { 2590 const struct qstr *usr_fname; 2591 struct fscrypt_str disk_name; 2592 struct dx_hash_info hinfo; 2593#ifdef CONFIG_FS_ENCRYPTION 2594 struct fscrypt_str crypto_buf; 2595#endif 2596#if IS_ENABLED(CONFIG_UNICODE) 2597 struct qstr cf_name; 2598#endif 2599}; 2600 2601#define fname_name(p) ((p)->disk_name.name) 2602#define fname_usr_name(p) ((p)->usr_fname->name) 2603#define fname_len(p) ((p)->disk_name.len) 2604 2605/* 2606 * Describe an inode's exact location on disk and in memory 2607 */ 2608struct ext4_iloc 2609{ 2610 struct buffer_head *bh; 2611 unsigned long offset; 2612 ext4_group_t block_group; 2613}; 2614 2615static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2616{ 2617 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2618} 2619 2620static inline bool ext4_is_quota_file(struct inode *inode) 2621{ 2622 return IS_NOQUOTA(inode) && 2623 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2624} 2625 2626/* 2627 * This structure is stuffed into the struct file's private_data field 2628 * for directories. It is where we put information so that we can do 2629 * readdir operations in hash tree order. 2630 */ 2631struct dir_private_info { 2632 struct rb_root root; 2633 struct rb_node *curr_node; 2634 struct fname *extra_fname; 2635 loff_t last_pos; 2636 __u32 curr_hash; 2637 __u32 curr_minor_hash; 2638 __u32 next_hash; 2639 u64 cookie; 2640 bool initialized; 2641}; 2642 2643/* calculate the first block number of the group */ 2644static inline ext4_fsblk_t 2645ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2646{ 2647 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2648 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2649} 2650 2651/* 2652 * Special error return code only used by dx_probe() and its callers. 2653 */ 2654#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2655 2656/* htree levels for ext4 */ 2657#define EXT4_HTREE_LEVEL_COMPAT 2 2658#define EXT4_HTREE_LEVEL 3 2659 2660static inline int ext4_dir_htree_level(struct super_block *sb) 2661{ 2662 return ext4_has_feature_largedir(sb) ? 2663 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2664} 2665 2666/* 2667 * Timeout and state flag for lazy initialization inode thread. 2668 */ 2669#define EXT4_DEF_LI_WAIT_MULT 10 2670#define EXT4_DEF_LI_MAX_START_DELAY 5 2671#define EXT4_LAZYINIT_QUIT 0x0001 2672#define EXT4_LAZYINIT_RUNNING 0x0002 2673 2674/* 2675 * Lazy inode table initialization info 2676 */ 2677struct ext4_lazy_init { 2678 unsigned long li_state; 2679 struct list_head li_request_list; 2680 struct mutex li_list_mtx; 2681}; 2682 2683enum ext4_li_mode { 2684 EXT4_LI_MODE_PREFETCH_BBITMAP, 2685 EXT4_LI_MODE_ITABLE, 2686}; 2687 2688struct ext4_li_request { 2689 struct super_block *lr_super; 2690 enum ext4_li_mode lr_mode; 2691 ext4_group_t lr_first_not_zeroed; 2692 ext4_group_t lr_next_group; 2693 struct list_head lr_request; 2694 unsigned long lr_next_sched; 2695 unsigned long lr_timeout; 2696}; 2697 2698struct ext4_features { 2699 struct kobject f_kobj; 2700 struct completion f_kobj_unregister; 2701}; 2702 2703/* 2704 * This structure will be used for multiple mount protection. It will be 2705 * written into the block number saved in the s_mmp_block field in the 2706 * superblock. Programs that check MMP should assume that if 2707 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2708 * to use the filesystem, regardless of how old the timestamp is. 2709 */ 2710#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2711#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2712#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2713#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2714 2715struct mmp_struct { 2716 __le32 mmp_magic; /* Magic number for MMP */ 2717 __le32 mmp_seq; /* Sequence no. updated periodically */ 2718 2719 /* 2720 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2721 * purposes and do not affect the correctness of the algorithm 2722 */ 2723 __le64 mmp_time; /* Time last updated */ 2724 char mmp_nodename[64]; /* Node which last updated MMP block */ 2725 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2726 2727 /* 2728 * mmp_check_interval is used to verify if the MMP block has been 2729 * updated on the block device. The value is updated based on the 2730 * maximum time to write the MMP block during an update cycle. 2731 */ 2732 __le16 mmp_check_interval; 2733 2734 __le16 mmp_pad1; 2735 __le32 mmp_pad2[226]; 2736 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2737}; 2738 2739/* arguments passed to the mmp thread */ 2740struct mmpd_data { 2741 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2742 struct super_block *sb; /* super block of the fs */ 2743}; 2744 2745/* 2746 * Check interval multiplier 2747 * The MMP block is written every update interval and initially checked every 2748 * update interval x the multiplier (the value is then adapted based on the 2749 * write latency). The reason is that writes can be delayed under load and we 2750 * don't want readers to incorrectly assume that the filesystem is no longer 2751 * in use. 2752 */ 2753#define EXT4_MMP_CHECK_MULT 2UL 2754 2755/* 2756 * Minimum interval for MMP checking in seconds. 2757 */ 2758#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2759 2760/* 2761 * Maximum interval for MMP checking in seconds. 2762 */ 2763#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2764 2765/* 2766 * Function prototypes 2767 */ 2768 2769/* 2770 * Ok, these declarations are also in <linux/kernel.h> but none of the 2771 * ext4 source programs needs to include it so they are duplicated here. 2772 */ 2773# define NORET_TYPE /**/ 2774# define ATTRIB_NORET __attribute__((noreturn)) 2775# define NORET_AND noreturn, 2776 2777/* bitmap.c */ 2778extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2779void ext4_inode_bitmap_csum_set(struct super_block *sb, 2780 struct ext4_group_desc *gdp, 2781 struct buffer_head *bh); 2782int ext4_inode_bitmap_csum_verify(struct super_block *sb, 2783 struct ext4_group_desc *gdp, 2784 struct buffer_head *bh); 2785void ext4_block_bitmap_csum_set(struct super_block *sb, 2786 struct ext4_group_desc *gdp, 2787 struct buffer_head *bh); 2788int ext4_block_bitmap_csum_verify(struct super_block *sb, 2789 struct ext4_group_desc *gdp, 2790 struct buffer_head *bh); 2791 2792/* balloc.c */ 2793extern void ext4_get_group_no_and_offset(struct super_block *sb, 2794 ext4_fsblk_t blocknr, 2795 ext4_group_t *blockgrpp, 2796 ext4_grpblk_t *offsetp); 2797extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2798 ext4_fsblk_t block); 2799 2800extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2801extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2802 ext4_group_t group); 2803extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2804 ext4_fsblk_t goal, 2805 unsigned int flags, 2806 unsigned long *count, 2807 int *errp); 2808extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2809 s64 nclusters, unsigned int flags); 2810extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2811extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2812 ext4_group_t block_group, 2813 struct buffer_head ** bh); 2814extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2815 ext4_group_t group); 2816extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2817 2818extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2819 ext4_group_t block_group, 2820 bool ignore_locked); 2821extern int ext4_wait_block_bitmap(struct super_block *sb, 2822 ext4_group_t block_group, 2823 struct buffer_head *bh); 2824extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2825 ext4_group_t block_group); 2826extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2827 ext4_group_t block_group, 2828 struct ext4_group_desc *gdp); 2829ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2830 2831#if IS_ENABLED(CONFIG_UNICODE) 2832extern int ext4_fname_setup_ci_filename(struct inode *dir, 2833 const struct qstr *iname, 2834 struct ext4_filename *fname); 2835 2836static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname) 2837{ 2838 kfree(fname->cf_name.name); 2839 fname->cf_name.name = NULL; 2840} 2841#else 2842static inline int ext4_fname_setup_ci_filename(struct inode *dir, 2843 const struct qstr *iname, 2844 struct ext4_filename *fname) 2845{ 2846 return 0; 2847} 2848 2849static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname) 2850{ 2851} 2852#endif 2853 2854/* ext4 encryption related stuff goes here crypto.c */ 2855#ifdef CONFIG_FS_ENCRYPTION 2856extern const struct fscrypt_operations ext4_cryptops; 2857 2858int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2859 int lookup, struct ext4_filename *fname); 2860 2861int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry, 2862 struct ext4_filename *fname); 2863 2864void ext4_fname_free_filename(struct ext4_filename *fname); 2865 2866int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg); 2867 2868#else /* !CONFIG_FS_ENCRYPTION */ 2869static inline int ext4_fname_setup_filename(struct inode *dir, 2870 const struct qstr *iname, 2871 int lookup, 2872 struct ext4_filename *fname) 2873{ 2874 fname->usr_fname = iname; 2875 fname->disk_name.name = (unsigned char *) iname->name; 2876 fname->disk_name.len = iname->len; 2877 2878 return ext4_fname_setup_ci_filename(dir, iname, fname); 2879} 2880 2881static inline int ext4_fname_prepare_lookup(struct inode *dir, 2882 struct dentry *dentry, 2883 struct ext4_filename *fname) 2884{ 2885 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2886} 2887 2888static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2889{ 2890 ext4_fname_free_ci_filename(fname); 2891} 2892 2893static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp, 2894 void __user *arg) 2895{ 2896 return -EOPNOTSUPP; 2897} 2898#endif /* !CONFIG_FS_ENCRYPTION */ 2899 2900/* dir.c */ 2901extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2902 struct file *, 2903 struct ext4_dir_entry_2 *, 2904 struct buffer_head *, char *, int, 2905 unsigned int); 2906#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2907 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2908 (de), (bh), (buf), (size), (offset))) 2909extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2910 __u32 minor_hash, 2911 struct ext4_dir_entry_2 *dirent, 2912 struct fscrypt_str *ent_name); 2913extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2914extern int ext4_find_dest_de(struct inode *dir, struct buffer_head *bh, 2915 void *buf, int buf_size, 2916 struct ext4_filename *fname, 2917 struct ext4_dir_entry_2 **dest_de); 2918void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2919 struct ext4_dir_entry_2 *de, 2920 int buf_size, 2921 struct ext4_filename *fname); 2922static inline void ext4_update_dx_flag(struct inode *inode) 2923{ 2924 if (!ext4_has_feature_dir_index(inode->i_sb) && 2925 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2926 /* ext4_iget() should have caught this... */ 2927 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2928 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2929 } 2930} 2931static const unsigned char ext4_filetype_table[] = { 2932 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2933}; 2934 2935static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2936{ 2937 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2938 return DT_UNKNOWN; 2939 2940 return ext4_filetype_table[filetype]; 2941} 2942extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2943 void *buf, int buf_size); 2944 2945/* fsync.c */ 2946extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2947 2948/* hash.c */ 2949extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2950 struct dx_hash_info *hinfo); 2951 2952/* ialloc.c */ 2953extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2954extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *, 2955 struct inode *, umode_t, 2956 const struct qstr *qstr, __u32 goal, 2957 uid_t *owner, __u32 i_flags, 2958 int handle_type, unsigned int line_no, 2959 int nblocks); 2960 2961#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2962 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \ 2963 (goal), (owner), i_flags, 0, 0, 0) 2964#define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \ 2965 type, nblocks) \ 2966 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2967 0, (type), __LINE__, (nblocks)) 2968 2969 2970extern void ext4_free_inode(handle_t *, struct inode *); 2971extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2972extern unsigned long ext4_count_free_inodes(struct super_block *); 2973extern unsigned long ext4_count_dirs(struct super_block *); 2974extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2975extern int ext4_init_inode_table(struct super_block *sb, 2976 ext4_group_t group, int barrier); 2977extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2978 2979/* fast_commit.c */ 2980int ext4_fc_info_show(struct seq_file *seq, void *v); 2981void ext4_fc_init(struct super_block *sb, journal_t *journal); 2982void ext4_fc_init_inode(struct inode *inode); 2983void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2984 ext4_lblk_t end); 2985void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2986 struct dentry *dentry); 2987void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2988 struct dentry *dentry); 2989void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2990void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2991void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2992 struct dentry *dentry); 2993void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2994void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2995void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); 2996void ext4_fc_del(struct inode *inode); 2997bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2998void ext4_fc_replay_cleanup(struct super_block *sb); 2999int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 3000int __init ext4_fc_init_dentry_cache(void); 3001void ext4_fc_destroy_dentry_cache(void); 3002int ext4_fc_record_regions(struct super_block *sb, int ino, 3003 ext4_lblk_t lblk, ext4_fsblk_t pblk, 3004 int len, int replay); 3005 3006/* mballoc.c */ 3007extern const struct seq_operations ext4_mb_seq_groups_ops; 3008extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 3009extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 3010extern int ext4_mb_init(struct super_block *); 3011extern void ext4_mb_release(struct super_block *); 3012extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 3013 struct ext4_allocation_request *, int *); 3014extern void ext4_discard_preallocations(struct inode *); 3015extern int __init ext4_init_mballoc(void); 3016extern void ext4_exit_mballoc(void); 3017extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 3018 ext4_group_t group, 3019 unsigned int nr, int *cnt); 3020extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 3021 unsigned int nr); 3022 3023extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 3024 struct buffer_head *bh, ext4_fsblk_t block, 3025 unsigned long count, int flags); 3026extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 3027 ext4_group_t ngroups); 3028extern int ext4_mb_add_groupinfo(struct super_block *sb, 3029 ext4_group_t i, struct ext4_group_desc *desc); 3030extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 3031 ext4_fsblk_t block, unsigned long count); 3032extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 3033extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 3034extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 3035 int len, bool state); 3036static inline bool ext4_mb_cr_expensive(enum criteria cr) 3037{ 3038 return cr >= CR_GOAL_LEN_SLOW; 3039} 3040 3041/* inode.c */ 3042void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 3043 struct ext4_inode_info *ei); 3044int ext4_inode_is_fast_symlink(struct inode *inode); 3045void ext4_check_map_extents_env(struct inode *inode); 3046struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 3047struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 3048int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 3049 bool wait, struct buffer_head **bhs); 3050int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 3051 struct buffer_head *bh_result, int create); 3052int ext4_get_block(struct inode *inode, sector_t iblock, 3053 struct buffer_head *bh_result, int create); 3054int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 3055 struct buffer_head *bh, int create); 3056int ext4_walk_page_buffers(handle_t *handle, 3057 struct inode *inode, 3058 struct buffer_head *head, 3059 unsigned from, 3060 unsigned to, 3061 int *partial, 3062 int (*fn)(handle_t *handle, struct inode *inode, 3063 struct buffer_head *bh)); 3064int do_journal_get_write_access(handle_t *handle, struct inode *inode, 3065 struct buffer_head *bh); 3066void ext4_set_inode_mapping_order(struct inode *inode); 3067#define FALL_BACK_TO_NONDELALLOC 1 3068#define CONVERT_INLINE_DATA 2 3069 3070typedef enum { 3071 EXT4_IGET_NORMAL = 0, 3072 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 3073 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */ 3074 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */ 3075 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */ 3076} ext4_iget_flags; 3077 3078extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 3079 ext4_iget_flags flags, const char *function, 3080 unsigned int line); 3081 3082#define ext4_iget(sb, ino, flags) \ 3083 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 3084 3085extern int ext4_write_inode(struct inode *, struct writeback_control *); 3086extern int ext4_setattr(struct mnt_idmap *, struct dentry *, 3087 struct iattr *); 3088extern u32 ext4_dio_alignment(struct inode *inode); 3089extern int ext4_getattr(struct mnt_idmap *, const struct path *, 3090 struct kstat *, u32, unsigned int); 3091extern void ext4_evict_inode(struct inode *); 3092extern void ext4_clear_inode(struct inode *); 3093extern int ext4_file_getattr(struct mnt_idmap *, const struct path *, 3094 struct kstat *, u32, unsigned int); 3095extern void ext4_dirty_inode(struct inode *, int); 3096extern int ext4_change_inode_journal_flag(struct inode *, int); 3097extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 3098extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 3099 struct ext4_iloc *iloc); 3100extern int ext4_inode_attach_jinode(struct inode *inode); 3101extern int ext4_can_truncate(struct inode *inode); 3102extern int ext4_truncate(struct inode *); 3103extern int ext4_break_layouts(struct inode *); 3104extern int ext4_truncate_page_cache_block_range(struct inode *inode, 3105 loff_t start, loff_t end); 3106extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 3107extern void ext4_set_inode_flags(struct inode *, bool init); 3108extern int ext4_alloc_da_blocks(struct inode *inode); 3109extern void ext4_set_aops(struct inode *inode); 3110extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode); 3111extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 3112extern int ext4_chunk_trans_extent(struct inode *inode, int nrblocks); 3113extern int ext4_meta_trans_blocks(struct inode *inode, int lblocks, 3114 int pextents); 3115extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 3116 loff_t lstart, loff_t lend); 3117extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 3118extern qsize_t *ext4_get_reserved_space(struct inode *inode); 3119extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 3120extern void ext4_da_release_space(struct inode *inode, int to_free); 3121extern void ext4_da_update_reserve_space(struct inode *inode, 3122 int used, int quota_claim); 3123extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 3124 ext4_fsblk_t pblk, ext4_lblk_t len); 3125 3126static inline bool is_special_ino(struct super_block *sb, unsigned long ino) 3127{ 3128 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 3129 3130 return (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) || 3131 ino == le32_to_cpu(es->s_usr_quota_inum) || 3132 ino == le32_to_cpu(es->s_grp_quota_inum) || 3133 ino == le32_to_cpu(es->s_prj_quota_inum) || 3134 ino == le32_to_cpu(es->s_orphan_file_inum); 3135} 3136 3137/* indirect.c */ 3138extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 3139 struct ext4_map_blocks *map, int flags); 3140extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 3141extern void ext4_ind_truncate(handle_t *, struct inode *inode); 3142extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 3143 ext4_lblk_t start, ext4_lblk_t end); 3144 3145/* ioctl.c */ 3146extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 3147extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 3148int ext4_fileattr_set(struct mnt_idmap *idmap, 3149 struct dentry *dentry, struct file_kattr *fa); 3150int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa); 3151extern void ext4_reset_inode_seed(struct inode *inode); 3152int ext4_update_overhead(struct super_block *sb, bool force); 3153int ext4_force_shutdown(struct super_block *sb, u32 flags); 3154 3155/* migrate.c */ 3156extern int ext4_ext_migrate(struct inode *); 3157extern int ext4_ind_migrate(struct inode *inode); 3158 3159/* namei.c */ 3160extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3161 struct inode *inode); 3162extern int ext4_dirblock_csum_verify(struct inode *inode, 3163 struct buffer_head *bh); 3164extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3165 __u32 start_minor_hash, __u32 *next_hash); 3166extern int ext4_search_dir(struct buffer_head *bh, 3167 char *search_buf, 3168 int buf_size, 3169 struct inode *dir, 3170 struct ext4_filename *fname, 3171 unsigned int offset, 3172 struct ext4_dir_entry_2 **res_dir); 3173extern int ext4_generic_delete_entry(struct inode *dir, 3174 struct ext4_dir_entry_2 *de_del, 3175 struct buffer_head *bh, 3176 void *entry_buf, 3177 int buf_size, 3178 int csum_size); 3179extern bool ext4_empty_dir(struct inode *inode); 3180 3181/* resize.c */ 3182extern void ext4_kvfree_array_rcu(void *to_free); 3183extern int ext4_group_add(struct super_block *sb, 3184 struct ext4_new_group_data *input); 3185extern int ext4_group_extend(struct super_block *sb, 3186 struct ext4_super_block *es, 3187 ext4_fsblk_t n_blocks_count); 3188extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3189extern unsigned int ext4_list_backups(struct super_block *sb, 3190 unsigned int *three, unsigned int *five, 3191 unsigned int *seven); 3192 3193/* super.c */ 3194extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3195 sector_t block, blk_opf_t op_flags); 3196extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3197 sector_t block); 3198extern struct buffer_head *ext4_sb_bread_nofail(struct super_block *sb, 3199 sector_t block); 3200extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, 3201 bh_end_io_t *end_io, bool simu_fail); 3202extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, 3203 bh_end_io_t *end_io, bool simu_fail); 3204extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait); 3205extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3206extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3207extern int ext4_calculate_overhead(struct super_block *sb); 3208extern __le32 ext4_superblock_csum(struct ext4_super_block *es); 3209extern void ext4_superblock_csum_set(struct super_block *sb); 3210extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3211 ext4_group_t ngroup); 3212extern const char *ext4_decode_error(struct super_block *sb, int errno, 3213 char nbuf[16]); 3214extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3215 ext4_group_t block_group, 3216 unsigned int flags); 3217extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb, 3218 ext4_group_t block_group); 3219 3220extern __printf(7, 8) 3221void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3222 int, __u64, const char *, ...); 3223extern __printf(6, 7) 3224void __ext4_error_inode(struct inode *, const char *, unsigned int, 3225 ext4_fsblk_t, int, const char *, ...); 3226extern __printf(5, 6) 3227void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3228 const char *, ...); 3229extern void __ext4_std_error(struct super_block *, const char *, 3230 unsigned int, int); 3231extern __printf(4, 5) 3232void __ext4_warning(struct super_block *, const char *, unsigned int, 3233 const char *, ...); 3234extern __printf(4, 5) 3235void __ext4_warning_inode(const struct inode *inode, const char *function, 3236 unsigned int line, const char *fmt, ...); 3237extern __printf(3, 4) 3238void __ext4_msg(struct super_block *, const char *, const char *, ...); 3239extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3240 const char *, unsigned int, const char *); 3241extern __printf(7, 8) 3242void __ext4_grp_locked_error(const char *, unsigned int, 3243 struct super_block *, ext4_group_t, 3244 unsigned long, ext4_fsblk_t, 3245 const char *, ...); 3246 3247#define EXT4_ERROR_INODE(inode, fmt, a...) \ 3248 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3249 3250#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3251 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3252 3253#define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3254 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3255 (fmt), ## a) 3256 3257#define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3258 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3259 3260#define ext4_abort(sb, err, fmt, a...) \ 3261 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3262 3263#ifdef CONFIG_PRINTK 3264 3265#define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3266 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3267#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3268 __ext4_error_inode((inode), (func), (line), (block), \ 3269 (err), (fmt), ##__VA_ARGS__) 3270#define ext4_error_file(file, func, line, block, fmt, ...) \ 3271 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3272#define ext4_error(sb, fmt, ...) \ 3273 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3274 ##__VA_ARGS__) 3275#define ext4_error_err(sb, err, fmt, ...) \ 3276 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3277 ##__VA_ARGS__) 3278#define ext4_warning(sb, fmt, ...) \ 3279 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3280#define ext4_warning_inode(inode, fmt, ...) \ 3281 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3282#define ext4_msg(sb, level, fmt, ...) \ 3283 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3284#define dump_mmp_msg(sb, mmp, msg) \ 3285 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3286#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3287 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3288 fmt, ##__VA_ARGS__) 3289 3290#else 3291 3292#define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3293do { \ 3294 no_printk(fmt, ##__VA_ARGS__); \ 3295 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3296} while (0) 3297#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3298do { \ 3299 no_printk(fmt, ##__VA_ARGS__); \ 3300 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3301} while (0) 3302#define ext4_error_file(file, func, line, block, fmt, ...) \ 3303do { \ 3304 no_printk(fmt, ##__VA_ARGS__); \ 3305 __ext4_error_file(file, "", 0, block, " "); \ 3306} while (0) 3307#define ext4_error(sb, fmt, ...) \ 3308do { \ 3309 no_printk(fmt, ##__VA_ARGS__); \ 3310 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3311} while (0) 3312#define ext4_error_err(sb, err, fmt, ...) \ 3313do { \ 3314 no_printk(fmt, ##__VA_ARGS__); \ 3315 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3316} while (0) 3317#define ext4_warning(sb, fmt, ...) \ 3318do { \ 3319 no_printk(fmt, ##__VA_ARGS__); \ 3320 __ext4_warning(sb, "", 0, " "); \ 3321} while (0) 3322#define ext4_warning_inode(inode, fmt, ...) \ 3323do { \ 3324 no_printk(fmt, ##__VA_ARGS__); \ 3325 __ext4_warning_inode(inode, "", 0, " "); \ 3326} while (0) 3327#define ext4_msg(sb, level, fmt, ...) \ 3328do { \ 3329 no_printk(fmt, ##__VA_ARGS__); \ 3330 __ext4_msg(sb, "", " "); \ 3331} while (0) 3332#define dump_mmp_msg(sb, mmp, msg) \ 3333 __dump_mmp_msg(sb, mmp, "", 0, "") 3334#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3335do { \ 3336 no_printk(fmt, ##__VA_ARGS__); \ 3337 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3338} while (0) 3339 3340#endif 3341 3342extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3343 struct ext4_group_desc *bg); 3344extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3345 struct ext4_group_desc *bg); 3346extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3347 struct ext4_group_desc *bg); 3348extern __u32 ext4_free_group_clusters(struct super_block *sb, 3349 struct ext4_group_desc *bg); 3350extern __u32 ext4_free_inodes_count(struct super_block *sb, 3351 struct ext4_group_desc *bg); 3352extern __u32 ext4_used_dirs_count(struct super_block *sb, 3353 struct ext4_group_desc *bg); 3354extern __u32 ext4_itable_unused_count(struct super_block *sb, 3355 struct ext4_group_desc *bg); 3356extern void ext4_block_bitmap_set(struct super_block *sb, 3357 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3358extern void ext4_inode_bitmap_set(struct super_block *sb, 3359 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3360extern void ext4_inode_table_set(struct super_block *sb, 3361 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3362extern void ext4_free_group_clusters_set(struct super_block *sb, 3363 struct ext4_group_desc *bg, 3364 __u32 count); 3365extern void ext4_free_inodes_set(struct super_block *sb, 3366 struct ext4_group_desc *bg, __u32 count); 3367extern void ext4_used_dirs_set(struct super_block *sb, 3368 struct ext4_group_desc *bg, __u32 count); 3369extern void ext4_itable_unused_set(struct super_block *sb, 3370 struct ext4_group_desc *bg, __u32 count); 3371extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3372 struct ext4_group_desc *gdp); 3373extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3374 struct ext4_group_desc *gdp); 3375extern int ext4_register_li_request(struct super_block *sb, 3376 ext4_group_t first_not_zeroed); 3377 3378static inline int ext4_has_group_desc_csum(struct super_block *sb) 3379{ 3380 return ext4_has_feature_gdt_csum(sb) || 3381 ext4_has_feature_metadata_csum(sb); 3382} 3383 3384#define ext4_read_incompat_64bit_val(es, name) \ 3385 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3386 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3387 le32_to_cpu(es->name##_lo)) 3388 3389static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3390{ 3391 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3392} 3393 3394static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3395{ 3396 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3397} 3398 3399static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3400{ 3401 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3402} 3403 3404static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3405 ext4_fsblk_t blk) 3406{ 3407 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3408 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3409} 3410 3411static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3412 ext4_fsblk_t blk) 3413{ 3414 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3415 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3416} 3417 3418static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3419 ext4_fsblk_t blk) 3420{ 3421 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3422 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3423} 3424 3425static inline loff_t ext4_isize(struct super_block *sb, 3426 struct ext4_inode *raw_inode) 3427{ 3428 if (ext4_has_feature_largedir(sb) || 3429 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3430 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3431 le32_to_cpu(raw_inode->i_size_lo); 3432 3433 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3434} 3435 3436static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3437{ 3438 raw_inode->i_size_lo = cpu_to_le32(i_size); 3439 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3440} 3441 3442/* 3443 * Reading s_groups_count requires using smp_rmb() afterwards. See 3444 * the locking protocol documented in the comments of ext4_group_add() 3445 * in resize.c 3446 */ 3447static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3448{ 3449 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3450 3451 smp_rmb(); 3452 return ngroups; 3453} 3454 3455static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3456 ext4_group_t block_group) 3457{ 3458 return block_group >> sbi->s_log_groups_per_flex; 3459} 3460 3461static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3462{ 3463 return 1 << sbi->s_log_groups_per_flex; 3464} 3465 3466static inline loff_t ext4_get_maxbytes(struct inode *inode) 3467{ 3468 if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) 3469 return inode->i_sb->s_maxbytes; 3470 return EXT4_SB(inode->i_sb)->s_bitmap_maxbytes; 3471} 3472 3473#define ext4_std_error(sb, errno) \ 3474do { \ 3475 if ((errno)) \ 3476 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3477} while (0) 3478 3479#ifdef CONFIG_SMP 3480/* Each CPU can accumulate percpu_counter_batch clusters in their local 3481 * counters. So we need to make sure we have free clusters more 3482 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3483 */ 3484#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3485#else 3486#define EXT4_FREECLUSTERS_WATERMARK 0 3487#endif 3488 3489/* Update i_disksize. Requires i_rwsem to avoid races with truncate */ 3490static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3491{ 3492 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3493 !inode_is_locked(inode)); 3494 down_write(&EXT4_I(inode)->i_data_sem); 3495 if (newsize > EXT4_I(inode)->i_disksize) 3496 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3497 up_write(&EXT4_I(inode)->i_data_sem); 3498} 3499 3500/* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ 3501static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3502{ 3503 int changed = 0; 3504 3505 if (newsize > inode->i_size) { 3506 i_size_write(inode, newsize); 3507 changed = 1; 3508 } 3509 if (newsize > EXT4_I(inode)->i_disksize) { 3510 ext4_update_i_disksize(inode, newsize); 3511 changed |= 2; 3512 } 3513 return changed; 3514} 3515 3516int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3517 loff_t len); 3518 3519struct ext4_group_info { 3520 unsigned long bb_state; 3521#ifdef AGGRESSIVE_CHECK 3522 unsigned long bb_check_counter; 3523#endif 3524 struct rb_root bb_free_root; 3525 ext4_grpblk_t bb_first_free; /* first free block */ 3526 ext4_grpblk_t bb_free; /* total free blocks */ 3527 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3528 int bb_avg_fragment_size_order; /* order of average 3529 fragment in BG */ 3530 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3531 ext4_group_t bb_group; /* Group number */ 3532 struct list_head bb_prealloc_list; 3533#ifdef DOUBLE_CHECK 3534 void *bb_bitmap; 3535#endif 3536 struct rw_semaphore alloc_sem; 3537 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3538 * regions, index is order. 3539 * bb_counters[3] = 5 means 3540 * 5 free 8-block regions. */ 3541}; 3542 3543#define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3544#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3545#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3546#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3547#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3548 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3549#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3550 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3551#define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3552 3553#define EXT4_MB_GRP_NEED_INIT(grp) \ 3554 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3555#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3556 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3557#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3558 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3559 3560#define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3561 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3562#define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3563 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3564#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3565 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3566#define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3567 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3568 3569#define EXT4_MAX_CONTENTION 8 3570#define EXT4_CONTENTION_THRESHOLD 2 3571 3572static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3573 ext4_group_t group) 3574{ 3575 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3576} 3577 3578/* 3579 * Returns true if the filesystem is busy enough that attempts to 3580 * access the block group locks has run into contention. 3581 */ 3582static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3583{ 3584 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3585} 3586 3587static inline bool ext4_try_lock_group(struct super_block *sb, ext4_group_t group) 3588{ 3589 if (!spin_trylock(ext4_group_lock_ptr(sb, group))) 3590 return false; 3591 /* 3592 * We're able to grab the lock right away, so drop the lock 3593 * contention counter. 3594 */ 3595 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3596 return true; 3597} 3598 3599static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3600{ 3601 if (!ext4_try_lock_group(sb, group)) { 3602 /* 3603 * The lock is busy, so bump the contention counter, 3604 * and then wait on the spin lock. 3605 */ 3606 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3607 EXT4_MAX_CONTENTION); 3608 spin_lock(ext4_group_lock_ptr(sb, group)); 3609 } 3610} 3611 3612static inline void ext4_unlock_group(struct super_block *sb, 3613 ext4_group_t group) 3614{ 3615 spin_unlock(ext4_group_lock_ptr(sb, group)); 3616} 3617 3618#ifdef CONFIG_QUOTA 3619static inline bool ext4_quota_capable(struct super_block *sb) 3620{ 3621 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3622} 3623 3624static inline bool ext4_is_quota_journalled(struct super_block *sb) 3625{ 3626 struct ext4_sb_info *sbi = EXT4_SB(sb); 3627 3628 return (ext4_has_feature_quota(sb) || 3629 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3630} 3631int ext4_enable_quotas(struct super_block *sb); 3632#endif 3633 3634/* 3635 * Block validity checking 3636 */ 3637#define ext4_check_indirect_blockref(inode, bh) \ 3638 ext4_check_blockref(__func__, __LINE__, inode, \ 3639 (__le32 *)(bh)->b_data, \ 3640 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3641 3642#define ext4_ind_check_inode(inode) \ 3643 ext4_check_blockref(__func__, __LINE__, inode, \ 3644 EXT4_I(inode)->i_data, \ 3645 EXT4_NDIR_BLOCKS) 3646 3647/* 3648 * Inodes and files operations 3649 */ 3650 3651/* dir.c */ 3652extern const struct file_operations ext4_dir_operations; 3653 3654/* file.c */ 3655extern const struct inode_operations ext4_file_inode_operations; 3656extern const struct file_operations ext4_file_operations; 3657extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3658 3659/* inline.c */ 3660extern int ext4_get_max_inline_size(struct inode *inode); 3661extern int ext4_find_inline_data_nolock(struct inode *inode); 3662extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3663extern void ext4_update_final_de(void *de_buf, int old_size, int new_size); 3664 3665int ext4_readpage_inline(struct inode *inode, struct folio *folio); 3666extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3667 struct inode *inode, 3668 loff_t pos, unsigned len, 3669 struct folio **foliop); 3670int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, 3671 unsigned copied, struct folio *folio); 3672extern int ext4_generic_write_inline_data(struct address_space *mapping, 3673 struct inode *inode, 3674 loff_t pos, unsigned len, 3675 struct folio **foliop, 3676 void **fsdata, bool da); 3677extern int ext4_try_add_inline_entry(handle_t *handle, 3678 struct ext4_filename *fname, 3679 struct inode *dir, struct inode *inode); 3680extern int ext4_try_create_inline_dir(handle_t *handle, 3681 struct inode *parent, 3682 struct inode *inode); 3683extern int ext4_read_inline_dir(struct file *filp, 3684 struct dir_context *ctx, 3685 int *has_inline_data); 3686extern int ext4_inlinedir_to_tree(struct file *dir_file, 3687 struct inode *dir, ext4_lblk_t block, 3688 struct dx_hash_info *hinfo, 3689 __u32 start_hash, __u32 start_minor_hash, 3690 int *has_inline_data); 3691extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3692 struct ext4_filename *fname, 3693 struct ext4_dir_entry_2 **res_dir, 3694 int *has_inline_data); 3695extern int ext4_delete_inline_entry(handle_t *handle, 3696 struct inode *dir, 3697 struct ext4_dir_entry_2 *de_del, 3698 struct buffer_head *bh, 3699 int *has_inline_data); 3700extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3701extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3702 struct ext4_dir_entry_2 **parent_de, 3703 int *retval); 3704extern void *ext4_read_inline_link(struct inode *inode); 3705 3706struct iomap; 3707extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3708 3709extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3710 3711extern int ext4_convert_inline_data(struct inode *inode); 3712 3713static inline int ext4_has_inline_data(struct inode *inode) 3714{ 3715 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3716 EXT4_I(inode)->i_inline_off; 3717} 3718 3719/* namei.c */ 3720extern const struct inode_operations ext4_dir_inode_operations; 3721extern const struct inode_operations ext4_special_inode_operations; 3722extern struct dentry *ext4_get_parent(struct dentry *child); 3723extern int ext4_init_dirblock(handle_t *handle, struct inode *inode, 3724 struct buffer_head *dir_block, 3725 unsigned int parent_ino, void *inline_buf, 3726 int inline_size); 3727extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3728 unsigned int blocksize); 3729extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3730 struct buffer_head *bh); 3731extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, 3732 struct inode *inode, struct dentry *dentry); 3733extern int __ext4_link(struct inode *dir, struct inode *inode, 3734 struct dentry *dentry); 3735 3736#define S_SHIFT 12 3737static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3738 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3739 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3740 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3741 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3742 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3743 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3744 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3745}; 3746 3747static inline void ext4_set_de_type(struct super_block *sb, 3748 struct ext4_dir_entry_2 *de, 3749 umode_t mode) { 3750 if (ext4_has_feature_filetype(sb)) 3751 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3752} 3753 3754/* readpages.c */ 3755extern int ext4_mpage_readpages(struct inode *inode, 3756 struct readahead_control *rac, struct folio *folio); 3757extern int __init ext4_init_post_read_processing(void); 3758extern void ext4_exit_post_read_processing(void); 3759 3760/* symlink.c */ 3761extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3762extern const struct inode_operations ext4_symlink_inode_operations; 3763extern const struct inode_operations ext4_fast_symlink_inode_operations; 3764 3765/* sysfs.c */ 3766extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3767extern int ext4_register_sysfs(struct super_block *sb); 3768extern void ext4_unregister_sysfs(struct super_block *sb); 3769extern int __init ext4_init_sysfs(void); 3770extern void ext4_exit_sysfs(void); 3771 3772/* block_validity */ 3773extern void ext4_release_system_zone(struct super_block *sb); 3774extern int ext4_setup_system_zone(struct super_block *sb); 3775extern int __init ext4_init_system_zone(void); 3776extern void ext4_exit_system_zone(void); 3777extern int ext4_inode_block_valid(struct inode *inode, 3778 ext4_fsblk_t start_blk, 3779 unsigned int count); 3780extern int ext4_check_blockref(const char *, unsigned int, 3781 struct inode *, __le32 *, unsigned int); 3782extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, 3783 ext4_fsblk_t start_blk, unsigned int count); 3784 3785 3786/* extents.c */ 3787struct ext4_ext_path; 3788struct ext4_extent; 3789 3790/* 3791 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3792 * __le32. 3793 */ 3794#define EXT_MAX_BLOCKS 0xffffffff 3795 3796extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3797extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3798extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3799 struct ext4_map_blocks *map, int flags); 3800extern int ext4_ext_truncate(handle_t *, struct inode *); 3801extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3802 ext4_lblk_t end); 3803extern void ext4_ext_init(struct super_block *); 3804extern void ext4_ext_release(struct super_block *); 3805extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3806 loff_t len); 3807extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3808 loff_t offset, ssize_t len); 3809extern int ext4_convert_unwritten_extents_atomic(handle_t *handle, 3810 struct inode *inode, loff_t offset, ssize_t len); 3811extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3812 ext4_io_end_t *io_end); 3813extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3814 struct ext4_map_blocks *map, int flags); 3815extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3816 int num, 3817 struct ext4_ext_path *path); 3818extern struct ext4_ext_path *ext4_ext_insert_extent( 3819 handle_t *handle, struct inode *inode, 3820 struct ext4_ext_path *path, 3821 struct ext4_extent *newext, int gb_flags); 3822extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3823 struct ext4_ext_path *, 3824 int flags); 3825extern void ext4_free_ext_path(struct ext4_ext_path *); 3826extern int ext4_ext_check_inode(struct inode *inode); 3827extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3828extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3829 __u64 start, __u64 len); 3830extern int ext4_get_es_cache(struct inode *inode, 3831 struct fiemap_extent_info *fieinfo, 3832 __u64 start, __u64 len); 3833extern int ext4_ext_precache(struct inode *inode); 3834extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3835 struct inode *inode2, ext4_lblk_t lblk1, 3836 ext4_lblk_t lblk2, ext4_lblk_t count, 3837 int mark_unwritten,int *err); 3838extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3839extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3840 int check_cred, int restart_cred, 3841 int revoke_cred); 3842extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3843extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3844extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3845 int len, int unwritten, ext4_fsblk_t pblk); 3846extern int ext4_ext_clear_bb(struct inode *inode); 3847 3848 3849/* move_extent.c */ 3850extern void ext4_double_down_write_data_sem(struct inode *first, 3851 struct inode *second); 3852extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3853 struct inode *donor_inode); 3854extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3855 __u64 start_orig, __u64 start_donor, 3856 __u64 len, __u64 *moved_len); 3857 3858/* page-io.c */ 3859extern int __init ext4_init_pageio(void); 3860extern void ext4_exit_pageio(void); 3861extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3862extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3863extern int ext4_put_io_end(ext4_io_end_t *io_end); 3864extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3865extern void ext4_io_submit_init(struct ext4_io_submit *io, 3866 struct writeback_control *wbc); 3867extern void ext4_end_io_rsv_work(struct work_struct *work); 3868extern void ext4_io_submit(struct ext4_io_submit *io); 3869int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page, 3870 size_t len); 3871extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3872extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3873 3874/* mmp.c */ 3875extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3876 3877/* mmp.c */ 3878extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3879 3880/* verity.c */ 3881extern const struct fsverity_operations ext4_verityops; 3882 3883/* orphan.c */ 3884extern int ext4_orphan_add(handle_t *, struct inode *); 3885extern int ext4_orphan_del(handle_t *, struct inode *); 3886extern void ext4_orphan_cleanup(struct super_block *sb, 3887 struct ext4_super_block *es); 3888extern void ext4_release_orphan_info(struct super_block *sb); 3889extern int ext4_init_orphan_info(struct super_block *sb); 3890extern int ext4_orphan_file_empty(struct super_block *sb); 3891extern void ext4_orphan_file_block_trigger( 3892 struct jbd2_buffer_trigger_type *triggers, 3893 struct buffer_head *bh, 3894 void *data, size_t size); 3895 3896/* 3897 * Add new method to test whether block and inode bitmaps are properly 3898 * initialized. With uninit_bg reading the block from disk is not enough 3899 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3900 */ 3901#define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3902 3903static inline int bitmap_uptodate(struct buffer_head *bh) 3904{ 3905 return (buffer_uptodate(bh) && 3906 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3907} 3908static inline void set_bitmap_uptodate(struct buffer_head *bh) 3909{ 3910 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3911} 3912 3913extern int ext4_resize_begin(struct super_block *sb); 3914extern int ext4_resize_end(struct super_block *sb, bool update_backups); 3915 3916static inline void ext4_set_io_unwritten_flag(struct ext4_io_end *io_end) 3917{ 3918 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) 3919 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3920} 3921 3922static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3923{ 3924 if (io_end->flag & EXT4_IO_END_UNWRITTEN) 3925 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3926} 3927 3928extern const struct iomap_ops ext4_iomap_ops; 3929extern const struct iomap_ops ext4_iomap_overwrite_ops; 3930extern const struct iomap_ops ext4_iomap_report_ops; 3931 3932static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3933{ 3934 /* 3935 * If the buffer has the write error flag, we have failed 3936 * to write out data in the block. In this case, we don't 3937 * have to read the block because we may read the old data 3938 * successfully. 3939 */ 3940 if (buffer_write_io_error(bh)) 3941 set_buffer_uptodate(bh); 3942 return buffer_uptodate(bh); 3943} 3944 3945static inline bool ext4_inode_can_atomic_write(struct inode *inode) 3946{ 3947 3948 return S_ISREG(inode->i_mode) && 3949 ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && 3950 EXT4_SB(inode->i_sb)->s_awu_min > 0; 3951} 3952 3953extern int ext4_block_write_begin(handle_t *handle, struct folio *folio, 3954 loff_t pos, unsigned len, 3955 get_block_t *get_block); 3956 3957#if IS_ENABLED(CONFIG_EXT4_KUNIT_TESTS) 3958#define EXPORT_SYMBOL_FOR_EXT4_TEST(sym) \ 3959 EXPORT_SYMBOL_FOR_MODULES(sym, "ext4-test") 3960#endif 3961#endif /* __KERNEL__ */ 3962 3963#define EFSBADCRC EBADMSG /* Bad CRC detected */ 3964#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3965 3966#endif /* _EXT4_H */
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