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/types.h> 21#include <linux/blkdev.h> 22#include <linux/magic.h> 23#include <linux/jbd2.h> 24#include <linux/quota.h> 25#include <linux/rwsem.h> 26#include <linux/rbtree.h> 27#include <linux/seqlock.h> 28#include <linux/mutex.h> 29#include <linux/timer.h> 30#include <linux/wait.h> 31#include <linux/sched/signal.h> 32#include <linux/blockgroup_lock.h> 33#include <linux/percpu_counter.h> 34#include <linux/ratelimit.h> 35#include <crypto/hash.h> 36#include <linux/falloc.h> 37#include <linux/percpu-rwsem.h> 38#include <linux/fiemap.h> 39#ifdef __KERNEL__ 40#include <linux/compat.h> 41#endif 42 43#include <linux/fscrypt.h> 44#include <linux/fsverity.h> 45 46#include <linux/compiler.h> 47 48/* 49 * The fourth extended filesystem constants/structures 50 */ 51 52/* 53 * with AGGRESSIVE_CHECK allocator runs consistency checks over 54 * structures. these checks slow things down a lot 55 */ 56#define AGGRESSIVE_CHECK__ 57 58/* 59 * with DOUBLE_CHECK defined mballoc creates persistent in-core 60 * bitmaps, maintains and uses them to check for double allocations 61 */ 62#define DOUBLE_CHECK__ 63 64/* 65 * Define EXT4FS_DEBUG to produce debug messages 66 */ 67#undef EXT4FS_DEBUG 68 69/* 70 * Debug code 71 */ 72#ifdef EXT4FS_DEBUG 73#define ext4_debug(f, a...) \ 74 do { \ 75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 76 __FILE__, __LINE__, __func__); \ 77 printk(KERN_DEBUG f, ## a); \ 78 } while (0) 79#else 80#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81#endif 82 83 /* 84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 85 */ 86#define EXT_DEBUG__ 87 88/* 89 * Dynamic printk for controlled extents debugging. 90 */ 91#ifdef CONFIG_EXT4_DEBUG 92#define ext_debug(ino, fmt, ...) \ 93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 94 current->comm, task_pid_nr(current), \ 95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 96 __func__, ##__VA_ARGS__) 97#else 98#define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 99#endif 100 101/* data type for block offset of block group */ 102typedef int ext4_grpblk_t; 103 104/* data type for filesystem-wide blocks number */ 105typedef unsigned long long ext4_fsblk_t; 106 107/* data type for file logical block number */ 108typedef __u32 ext4_lblk_t; 109 110/* data type for block group number */ 111typedef unsigned int ext4_group_t; 112 113enum SHIFT_DIRECTION { 114 SHIFT_LEFT = 0, 115 SHIFT_RIGHT, 116}; 117 118/* 119 * Flags used in mballoc's allocation_context flags field. 120 * 121 * Also used to show what's going on for debugging purposes when the 122 * flag field is exported via the traceport interface 123 */ 124 125/* prefer goal again. length */ 126#define EXT4_MB_HINT_MERGE 0x0001 127/* blocks already reserved */ 128#define EXT4_MB_HINT_RESERVED 0x0002 129/* metadata is being allocated */ 130#define EXT4_MB_HINT_METADATA 0x0004 131/* first blocks in the file */ 132#define EXT4_MB_HINT_FIRST 0x0008 133/* search for the best chunk */ 134#define EXT4_MB_HINT_BEST 0x0010 135/* data is being allocated */ 136#define EXT4_MB_HINT_DATA 0x0020 137/* don't preallocate (for tails) */ 138#define EXT4_MB_HINT_NOPREALLOC 0x0040 139/* allocate for locality group */ 140#define EXT4_MB_HINT_GROUP_ALLOC 0x0080 141/* allocate goal blocks or none */ 142#define EXT4_MB_HINT_GOAL_ONLY 0x0100 143/* goal is meaningful */ 144#define EXT4_MB_HINT_TRY_GOAL 0x0200 145/* blocks already pre-reserved by delayed allocation */ 146#define EXT4_MB_DELALLOC_RESERVED 0x0400 147/* We are doing stream allocation */ 148#define EXT4_MB_STREAM_ALLOC 0x0800 149/* Use reserved root blocks if needed */ 150#define EXT4_MB_USE_ROOT_BLOCKS 0x1000 151/* Use blocks from reserved pool */ 152#define EXT4_MB_USE_RESERVED 0x2000 153/* Do strict check for free blocks while retrying block allocation */ 154#define EXT4_MB_STRICT_CHECK 0x4000 155 156struct ext4_allocation_request { 157 /* target inode for block we're allocating */ 158 struct inode *inode; 159 /* how many blocks we want to allocate */ 160 unsigned int len; 161 /* logical block in target inode */ 162 ext4_lblk_t logical; 163 /* the closest logical allocated block to the left */ 164 ext4_lblk_t lleft; 165 /* the closest logical allocated block to the right */ 166 ext4_lblk_t lright; 167 /* phys. target (a hint) */ 168 ext4_fsblk_t goal; 169 /* phys. block for the closest logical allocated block to the left */ 170 ext4_fsblk_t pleft; 171 /* phys. block for the closest logical allocated block to the right */ 172 ext4_fsblk_t pright; 173 /* flags. see above EXT4_MB_HINT_* */ 174 unsigned int flags; 175}; 176 177/* 178 * Logical to physical block mapping, used by ext4_map_blocks() 179 * 180 * This structure is used to pass requests into ext4_map_blocks() as 181 * well as to store the information returned by ext4_map_blocks(). It 182 * takes less room on the stack than a struct buffer_head. 183 */ 184#define EXT4_MAP_NEW BIT(BH_New) 185#define EXT4_MAP_MAPPED BIT(BH_Mapped) 186#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 187#define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 188#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 189 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 190 191struct ext4_map_blocks { 192 ext4_fsblk_t m_pblk; 193 ext4_lblk_t m_lblk; 194 unsigned int m_len; 195 unsigned int m_flags; 196}; 197 198/* 199 * Block validity checking, system zone rbtree. 200 */ 201struct ext4_system_blocks { 202 struct rb_root root; 203 struct rcu_head rcu; 204}; 205 206/* 207 * Flags for ext4_io_end->flags 208 */ 209#define EXT4_IO_END_UNWRITTEN 0x0001 210 211struct ext4_io_end_vec { 212 struct list_head list; /* list of io_end_vec */ 213 loff_t offset; /* offset in the file */ 214 ssize_t size; /* size of the extent */ 215}; 216 217/* 218 * For converting unwritten extents on a work queue. 'handle' is used for 219 * buffered writeback. 220 */ 221typedef struct ext4_io_end { 222 struct list_head list; /* per-file finished IO list */ 223 handle_t *handle; /* handle reserved for extent 224 * conversion */ 225 struct inode *inode; /* file being written to */ 226 struct bio *bio; /* Linked list of completed 227 * bios covering the extent */ 228 unsigned int flag; /* unwritten or not */ 229 atomic_t count; /* reference counter */ 230 struct list_head list_vec; /* list of ext4_io_end_vec */ 231} ext4_io_end_t; 232 233struct ext4_io_submit { 234 struct writeback_control *io_wbc; 235 struct bio *io_bio; 236 ext4_io_end_t *io_end; 237 sector_t io_next_block; 238}; 239 240/* 241 * Special inodes numbers 242 */ 243#define EXT4_BAD_INO 1 /* Bad blocks inode */ 244#define EXT4_ROOT_INO 2 /* Root inode */ 245#define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 246#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 247#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 248#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 249#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 250#define EXT4_JOURNAL_INO 8 /* Journal inode */ 251 252/* First non-reserved inode for old ext4 filesystems */ 253#define EXT4_GOOD_OLD_FIRST_INO 11 254 255/* 256 * Maximal count of links to a file 257 */ 258#define EXT4_LINK_MAX 65000 259 260/* 261 * Macro-instructions used to manage several block sizes 262 */ 263#define EXT4_MIN_BLOCK_SIZE 1024 264#define EXT4_MAX_BLOCK_SIZE 65536 265#define EXT4_MIN_BLOCK_LOG_SIZE 10 266#define EXT4_MAX_BLOCK_LOG_SIZE 16 267#define EXT4_MAX_CLUSTER_LOG_SIZE 30 268#ifdef __KERNEL__ 269# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 270#else 271# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 272#endif 273#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 274#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 275 EXT4_SB(s)->s_cluster_bits) 276#ifdef __KERNEL__ 277# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 278# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 279#else 280# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 281#endif 282#ifdef __KERNEL__ 283#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 284#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 285#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 286#else 287#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 288 EXT4_GOOD_OLD_INODE_SIZE : \ 289 (s)->s_inode_size) 290#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 291 EXT4_GOOD_OLD_FIRST_INO : \ 292 (s)->s_first_ino) 293#endif 294#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 295#define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 296 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 297 blkbits)) 298 299/* Translate a block number to a cluster number */ 300#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 301/* Translate a cluster number to a block number */ 302#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 303/* Translate # of blks to # of clusters */ 304#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 305 (sbi)->s_cluster_bits) 306/* Mask out the low bits to get the starting block of the cluster */ 307#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 308 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 309#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 310 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 311/* Fill in the low bits to get the last block of the cluster */ 312#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 313 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 314/* Get the cluster offset */ 315#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 316 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 317#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 318 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 319 320/* 321 * Structure of a blocks group descriptor 322 */ 323struct ext4_group_desc 324{ 325 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 326 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 327 __le32 bg_inode_table_lo; /* Inodes table block */ 328 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 329 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 330 __le16 bg_used_dirs_count_lo; /* Directories count */ 331 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 332 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 333 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 334 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 335 __le16 bg_itable_unused_lo; /* Unused inodes count */ 336 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 337 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 338 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 339 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 340 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 341 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 342 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 343 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 344 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 345 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 346 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 347 __u32 bg_reserved; 348}; 349 350#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 351 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 352 sizeof(__le16)) 353#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 354 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 355 sizeof(__le16)) 356 357/* 358 * Structure of a flex block group info 359 */ 360 361struct flex_groups { 362 atomic64_t free_clusters; 363 atomic_t free_inodes; 364 atomic_t used_dirs; 365}; 366 367#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 368#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 369#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 370 371/* 372 * Macro-instructions used to manage group descriptors 373 */ 374#define EXT4_MIN_DESC_SIZE 32 375#define EXT4_MIN_DESC_SIZE_64BIT 64 376#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 377#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 378#ifdef __KERNEL__ 379# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 380# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 381# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 382# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 383# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 384#else 385# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 386# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 387# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 388#endif 389 390/* 391 * Constants relative to the data blocks 392 */ 393#define EXT4_NDIR_BLOCKS 12 394#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 395#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 396#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 397#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 398 399/* 400 * Inode flags 401 */ 402#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 403#define EXT4_UNRM_FL 0x00000002 /* Undelete */ 404#define EXT4_COMPR_FL 0x00000004 /* Compress file */ 405#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 406#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 407#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 408#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 409#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 410/* Reserved for compression usage... */ 411#define EXT4_DIRTY_FL 0x00000100 412#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 413#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 414 /* nb: was previously EXT2_ECOMPR_FL */ 415#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 416/* End compression flags --- maybe not all used */ 417#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 418#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 419#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 420#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 421#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 422#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 423#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 424#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 425#define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 426#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 427/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 428 429#define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 430 431#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 432#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 433#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 434#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 435 436/* User modifiable flags */ 437#define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 438 EXT4_UNRM_FL | \ 439 EXT4_COMPR_FL | \ 440 EXT4_SYNC_FL | \ 441 EXT4_IMMUTABLE_FL | \ 442 EXT4_APPEND_FL | \ 443 EXT4_NODUMP_FL | \ 444 EXT4_NOATIME_FL | \ 445 EXT4_JOURNAL_DATA_FL | \ 446 EXT4_NOTAIL_FL | \ 447 EXT4_DIRSYNC_FL | \ 448 EXT4_TOPDIR_FL | \ 449 EXT4_EXTENTS_FL | \ 450 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 451 EXT4_DAX_FL | \ 452 EXT4_PROJINHERIT_FL | \ 453 EXT4_CASEFOLD_FL) 454 455/* User visible flags */ 456#define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 457 EXT4_DIRTY_FL | \ 458 EXT4_COMPRBLK_FL | \ 459 EXT4_NOCOMPR_FL | \ 460 EXT4_ENCRYPT_FL | \ 461 EXT4_INDEX_FL | \ 462 EXT4_VERITY_FL | \ 463 EXT4_INLINE_DATA_FL) 464 465/* Flags we can manipulate with through FS_IOC_FSSETXATTR */ 466#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 467 EXT4_IMMUTABLE_FL | \ 468 EXT4_APPEND_FL | \ 469 EXT4_NODUMP_FL | \ 470 EXT4_NOATIME_FL | \ 471 EXT4_PROJINHERIT_FL | \ 472 EXT4_DAX_FL) 473 474/* Flags that should be inherited by new inodes from their parent. */ 475#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 476 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 477 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 478 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 479 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 480 EXT4_DAX_FL) 481 482/* Flags that are appropriate for regular files (all but dir-specific ones). */ 483#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 484 EXT4_PROJINHERIT_FL)) 485 486/* Flags that are appropriate for non-directories/regular files. */ 487#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 488 489/* The only flags that should be swapped */ 490#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 491 492/* Flags which are mutually exclusive to DAX */ 493#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 494 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 495 496/* Mask out flags that are inappropriate for the given type of inode. */ 497static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 498{ 499 if (S_ISDIR(mode)) 500 return flags; 501 else if (S_ISREG(mode)) 502 return flags & EXT4_REG_FLMASK; 503 else 504 return flags & EXT4_OTHER_FLMASK; 505} 506 507/* 508 * Inode flags used for atomic set/get 509 */ 510enum { 511 EXT4_INODE_SECRM = 0, /* Secure deletion */ 512 EXT4_INODE_UNRM = 1, /* Undelete */ 513 EXT4_INODE_COMPR = 2, /* Compress file */ 514 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 515 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 516 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 517 EXT4_INODE_NODUMP = 6, /* do not dump file */ 518 EXT4_INODE_NOATIME = 7, /* do not update atime */ 519/* Reserved for compression usage... */ 520 EXT4_INODE_DIRTY = 8, 521 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 522 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 523 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 524/* End compression flags --- maybe not all used */ 525 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 526 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 527 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 528 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 529 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 530 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 531 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 532 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 533 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 534 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 535/* 22 was formerly EXT4_INODE_EOFBLOCKS */ 536 EXT4_INODE_DAX = 25, /* Inode is DAX */ 537 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 538 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 539 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 540 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 541}; 542 543/* 544 * Since it's pretty easy to mix up bit numbers and hex values, we use a 545 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 546 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 547 * any extra space in the compiled kernel image, otherwise, the build will fail. 548 * It's important that these values are the same, since we are using 549 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 550 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 551 * values found in ext2, ext3 and ext4 filesystems, and of course the values 552 * defined in e2fsprogs. 553 * 554 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 555 */ 556#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG)) 557#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 558 559static inline void ext4_check_flag_values(void) 560{ 561 CHECK_FLAG_VALUE(SECRM); 562 CHECK_FLAG_VALUE(UNRM); 563 CHECK_FLAG_VALUE(COMPR); 564 CHECK_FLAG_VALUE(SYNC); 565 CHECK_FLAG_VALUE(IMMUTABLE); 566 CHECK_FLAG_VALUE(APPEND); 567 CHECK_FLAG_VALUE(NODUMP); 568 CHECK_FLAG_VALUE(NOATIME); 569 CHECK_FLAG_VALUE(DIRTY); 570 CHECK_FLAG_VALUE(COMPRBLK); 571 CHECK_FLAG_VALUE(NOCOMPR); 572 CHECK_FLAG_VALUE(ENCRYPT); 573 CHECK_FLAG_VALUE(INDEX); 574 CHECK_FLAG_VALUE(IMAGIC); 575 CHECK_FLAG_VALUE(JOURNAL_DATA); 576 CHECK_FLAG_VALUE(NOTAIL); 577 CHECK_FLAG_VALUE(DIRSYNC); 578 CHECK_FLAG_VALUE(TOPDIR); 579 CHECK_FLAG_VALUE(HUGE_FILE); 580 CHECK_FLAG_VALUE(EXTENTS); 581 CHECK_FLAG_VALUE(VERITY); 582 CHECK_FLAG_VALUE(EA_INODE); 583 CHECK_FLAG_VALUE(INLINE_DATA); 584 CHECK_FLAG_VALUE(PROJINHERIT); 585 CHECK_FLAG_VALUE(CASEFOLD); 586 CHECK_FLAG_VALUE(RESERVED); 587} 588 589/* Used to pass group descriptor data when online resize is done */ 590struct ext4_new_group_input { 591 __u32 group; /* Group number for this data */ 592 __u64 block_bitmap; /* Absolute block number of block bitmap */ 593 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 594 __u64 inode_table; /* Absolute block number of inode table start */ 595 __u32 blocks_count; /* Total number of blocks in this group */ 596 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 597 __u16 unused; 598}; 599 600#if defined(__KERNEL__) && defined(CONFIG_COMPAT) 601struct compat_ext4_new_group_input { 602 u32 group; 603 compat_u64 block_bitmap; 604 compat_u64 inode_bitmap; 605 compat_u64 inode_table; 606 u32 blocks_count; 607 u16 reserved_blocks; 608 u16 unused; 609}; 610#endif 611 612/* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 613struct ext4_new_group_data { 614 __u32 group; 615 __u64 block_bitmap; 616 __u64 inode_bitmap; 617 __u64 inode_table; 618 __u32 blocks_count; 619 __u16 reserved_blocks; 620 __u16 mdata_blocks; 621 __u32 free_clusters_count; 622}; 623 624/* Indexes used to index group tables in ext4_new_group_data */ 625enum { 626 BLOCK_BITMAP = 0, /* block bitmap */ 627 INODE_BITMAP, /* inode bitmap */ 628 INODE_TABLE, /* inode tables */ 629 GROUP_TABLE_COUNT, 630}; 631 632/* 633 * Flags used by ext4_map_blocks() 634 */ 635 /* Allocate any needed blocks and/or convert an unwritten 636 extent to be an initialized ext4 */ 637#define EXT4_GET_BLOCKS_CREATE 0x0001 638 /* Request the creation of an unwritten extent */ 639#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 640#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 641 EXT4_GET_BLOCKS_CREATE) 642 /* Caller is from the delayed allocation writeout path 643 * finally doing the actual allocation of delayed blocks */ 644#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 645 /* caller is from the direct IO path, request to creation of an 646 unwritten extents if not allocated, split the unwritten 647 extent if blocks has been preallocated already*/ 648#define EXT4_GET_BLOCKS_PRE_IO 0x0008 649#define EXT4_GET_BLOCKS_CONVERT 0x0010 650#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 651 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 652 /* Convert extent to initialized after IO complete */ 653#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 654 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 655 /* Eventual metadata allocation (due to growing extent tree) 656 * should not fail, so try to use reserved blocks for that.*/ 657#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 658 /* Don't normalize allocation size (used for fallocate) */ 659#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 660 /* Convert written extents to unwritten */ 661#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 662 /* Write zeros to newly created written extents */ 663#define EXT4_GET_BLOCKS_ZERO 0x0200 664#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 665 EXT4_GET_BLOCKS_ZERO) 666 /* Caller will submit data before dropping transaction handle. This 667 * allows jbd2 to avoid submitting data before commit. */ 668#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 669 670/* 671 * The bit position of these flags must not overlap with any of the 672 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 673 * read_extent_tree_block(), ext4_split_extent_at(), 674 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 675 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 676 * caching the extents when reading from the extent tree while a 677 * truncate or punch hole operation is in progress. 678 */ 679#define EXT4_EX_NOCACHE 0x40000000 680#define EXT4_EX_FORCE_CACHE 0x20000000 681#define EXT4_EX_NOFAIL 0x10000000 682 683/* 684 * Flags used by ext4_free_blocks 685 */ 686#define EXT4_FREE_BLOCKS_METADATA 0x0001 687#define EXT4_FREE_BLOCKS_FORGET 0x0002 688#define EXT4_FREE_BLOCKS_VALIDATED 0x0004 689#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 690#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 691#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 692#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 693 694/* 695 * ioctl commands 696 */ 697#define EXT4_IOC_GETVERSION _IOR('f', 3, long) 698#define EXT4_IOC_SETVERSION _IOW('f', 4, long) 699#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 700#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 701#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 702#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 703#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 704#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 705#define EXT4_IOC_MIGRATE _IO('f', 9) 706 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 707 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 708#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 709#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 710#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 711#define EXT4_IOC_SWAP_BOOT _IO('f', 17) 712#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 713/* ioctl codes 19--39 are reserved for fscrypt */ 714#define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 715#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 716#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 717 718#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 719 720/* 721 * Flags for going down operation 722 */ 723#define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 724#define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 725#define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 726 727/* 728 * Flags returned by EXT4_IOC_GETSTATE 729 * 730 * We only expose to userspace a subset of the state flags in 731 * i_state_flags 732 */ 733#define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 734#define EXT4_STATE_FLAG_NEW 0x00000002 735#define EXT4_STATE_FLAG_NEWENTRY 0x00000004 736#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 737 738#if defined(__KERNEL__) && defined(CONFIG_COMPAT) 739/* 740 * ioctl commands in 32 bit emulation 741 */ 742#define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 743#define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 744#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 745#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 746#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 747#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 748#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 749#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 750#endif 751 752/* 753 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 754 * It indicates that the entry in extent status cache is for a hole. 755 */ 756#define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 757 758/* Max physical block we can address w/o extents */ 759#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 760 761/* Max logical block we can support */ 762#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 763 764/* 765 * Structure of an inode on the disk 766 */ 767struct ext4_inode { 768 __le16 i_mode; /* File mode */ 769 __le16 i_uid; /* Low 16 bits of Owner Uid */ 770 __le32 i_size_lo; /* Size in bytes */ 771 __le32 i_atime; /* Access time */ 772 __le32 i_ctime; /* Inode Change time */ 773 __le32 i_mtime; /* Modification time */ 774 __le32 i_dtime; /* Deletion Time */ 775 __le16 i_gid; /* Low 16 bits of Group Id */ 776 __le16 i_links_count; /* Links count */ 777 __le32 i_blocks_lo; /* Blocks count */ 778 __le32 i_flags; /* File flags */ 779 union { 780 struct { 781 __le32 l_i_version; 782 } linux1; 783 struct { 784 __u32 h_i_translator; 785 } hurd1; 786 struct { 787 __u32 m_i_reserved1; 788 } masix1; 789 } osd1; /* OS dependent 1 */ 790 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 791 __le32 i_generation; /* File version (for NFS) */ 792 __le32 i_file_acl_lo; /* File ACL */ 793 __le32 i_size_high; 794 __le32 i_obso_faddr; /* Obsoleted fragment address */ 795 union { 796 struct { 797 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 798 __le16 l_i_file_acl_high; 799 __le16 l_i_uid_high; /* these 2 fields */ 800 __le16 l_i_gid_high; /* were reserved2[0] */ 801 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 802 __le16 l_i_reserved; 803 } linux2; 804 struct { 805 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 806 __u16 h_i_mode_high; 807 __u16 h_i_uid_high; 808 __u16 h_i_gid_high; 809 __u32 h_i_author; 810 } hurd2; 811 struct { 812 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 813 __le16 m_i_file_acl_high; 814 __u32 m_i_reserved2[2]; 815 } masix2; 816 } osd2; /* OS dependent 2 */ 817 __le16 i_extra_isize; 818 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 819 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 820 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 821 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 822 __le32 i_crtime; /* File Creation time */ 823 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 824 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 825 __le32 i_projid; /* Project ID */ 826}; 827 828struct move_extent { 829 __u32 reserved; /* should be zero */ 830 __u32 donor_fd; /* donor file descriptor */ 831 __u64 orig_start; /* logical start offset in block for orig */ 832 __u64 donor_start; /* logical start offset in block for donor */ 833 __u64 len; /* block length to be moved */ 834 __u64 moved_len; /* moved block length */ 835}; 836 837#define EXT4_EPOCH_BITS 2 838#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 839#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 840 841/* 842 * Extended fields will fit into an inode if the filesystem was formatted 843 * with large inodes (-I 256 or larger) and there are not currently any EAs 844 * consuming all of the available space. For new inodes we always reserve 845 * enough space for the kernel's known extended fields, but for inodes 846 * created with an old kernel this might not have been the case. None of 847 * the extended inode fields is critical for correct filesystem operation. 848 * This macro checks if a certain field fits in the inode. Note that 849 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 850 */ 851#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 852 ((offsetof(typeof(*ext4_inode), field) + \ 853 sizeof((ext4_inode)->field)) \ 854 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 855 (einode)->i_extra_isize)) \ 856 857/* 858 * We use an encoding that preserves the times for extra epoch "00": 859 * 860 * extra msb of adjust for signed 861 * epoch 32-bit 32-bit tv_sec to 862 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 863 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 864 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 865 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 866 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 867 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 868 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 869 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 870 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 871 * 872 * Note that previous versions of the kernel on 64-bit systems would 873 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 874 * 1970. e2fsck will correct this, assuming that it is run on the 875 * affected filesystem before 2242. 876 */ 877 878static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 879{ 880 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 881 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 882} 883 884static inline void ext4_decode_extra_time(struct timespec64 *time, 885 __le32 extra) 886{ 887 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 888 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 889 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 890} 891 892#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 893do { \ 894 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 895 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 896 (raw_inode)->xtime ## _extra = \ 897 ext4_encode_extra_time(&(inode)->xtime); \ 898 } \ 899 else \ 900 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 901} while (0) 902 903#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 904do { \ 905 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 906 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 907 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 908 (raw_inode)->xtime ## _extra = \ 909 ext4_encode_extra_time(&(einode)->xtime); \ 910} while (0) 911 912#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 913do { \ 914 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 915 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 916 ext4_decode_extra_time(&(inode)->xtime, \ 917 raw_inode->xtime ## _extra); \ 918 } \ 919 else \ 920 (inode)->xtime.tv_nsec = 0; \ 921} while (0) 922 923 924#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 925do { \ 926 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 927 (einode)->xtime.tv_sec = \ 928 (signed)le32_to_cpu((raw_inode)->xtime); \ 929 else \ 930 (einode)->xtime.tv_sec = 0; \ 931 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 932 ext4_decode_extra_time(&(einode)->xtime, \ 933 raw_inode->xtime ## _extra); \ 934 else \ 935 (einode)->xtime.tv_nsec = 0; \ 936} while (0) 937 938#define i_disk_version osd1.linux1.l_i_version 939 940#if defined(__KERNEL__) || defined(__linux__) 941#define i_reserved1 osd1.linux1.l_i_reserved1 942#define i_file_acl_high osd2.linux2.l_i_file_acl_high 943#define i_blocks_high osd2.linux2.l_i_blocks_high 944#define i_uid_low i_uid 945#define i_gid_low i_gid 946#define i_uid_high osd2.linux2.l_i_uid_high 947#define i_gid_high osd2.linux2.l_i_gid_high 948#define i_checksum_lo osd2.linux2.l_i_checksum_lo 949 950#elif defined(__GNU__) 951 952#define i_translator osd1.hurd1.h_i_translator 953#define i_uid_high osd2.hurd2.h_i_uid_high 954#define i_gid_high osd2.hurd2.h_i_gid_high 955#define i_author osd2.hurd2.h_i_author 956 957#elif defined(__masix__) 958 959#define i_reserved1 osd1.masix1.m_i_reserved1 960#define i_file_acl_high osd2.masix2.m_i_file_acl_high 961#define i_reserved2 osd2.masix2.m_i_reserved2 962 963#endif /* defined(__KERNEL__) || defined(__linux__) */ 964 965#include "extents_status.h" 966#include "fast_commit.h" 967 968/* 969 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 970 * 971 * These are needed to avoid lockdep false positives when we need to 972 * allocate blocks to the quota inode during ext4_map_blocks(), while 973 * holding i_data_sem for a normal (non-quota) inode. Since we don't 974 * do quota tracking for the quota inode, this avoids deadlock (as 975 * well as infinite recursion, since it isn't turtles all the way 976 * down...) 977 * 978 * I_DATA_SEM_NORMAL - Used for most inodes 979 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 980 * where the second inode has larger inode number 981 * than the first 982 * I_DATA_SEM_QUOTA - Used for quota inodes only 983 * I_DATA_SEM_EA - Used for ea_inodes only 984 */ 985enum { 986 I_DATA_SEM_NORMAL = 0, 987 I_DATA_SEM_OTHER, 988 I_DATA_SEM_QUOTA, 989 I_DATA_SEM_EA 990}; 991 992 993/* 994 * fourth extended file system inode data in memory 995 */ 996struct ext4_inode_info { 997 __le32 i_data[15]; /* unconverted */ 998 __u32 i_dtime; 999 ext4_fsblk_t i_file_acl; 1000 1001 /* 1002 * i_block_group is the number of the block group which contains 1003 * this file's inode. Constant across the lifetime of the inode, 1004 * it is used for making block allocation decisions - we try to 1005 * place a file's data blocks near its inode block, and new inodes 1006 * near to their parent directory's inode. 1007 */ 1008 ext4_group_t i_block_group; 1009 ext4_lblk_t i_dir_start_lookup; 1010#if (BITS_PER_LONG < 64) 1011 unsigned long i_state_flags; /* Dynamic state flags */ 1012#endif 1013 unsigned long i_flags; 1014 1015 /* 1016 * Extended attributes can be read independently of the main file 1017 * data. Taking i_mutex even when reading would cause contention 1018 * between readers of EAs and writers of regular file data, so 1019 * instead we synchronize on xattr_sem when reading or changing 1020 * EAs. 1021 */ 1022 struct rw_semaphore xattr_sem; 1023 1024 struct list_head i_orphan; /* unlinked but open inodes */ 1025 1026 /* Fast commit related info */ 1027 1028 struct list_head i_fc_list; /* 1029 * inodes that need fast commit 1030 * protected by sbi->s_fc_lock. 1031 */ 1032 1033 /* Start of lblk range that needs to be committed in this fast commit */ 1034 ext4_lblk_t i_fc_lblk_start; 1035 1036 /* End of lblk range that needs to be committed in this fast commit */ 1037 ext4_lblk_t i_fc_lblk_len; 1038 1039 /* Number of ongoing updates on this inode */ 1040 atomic_t i_fc_updates; 1041 1042 /* Fast commit wait queue for this inode */ 1043 wait_queue_head_t i_fc_wait; 1044 1045 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1046 struct mutex i_fc_lock; 1047 1048 /* 1049 * i_disksize keeps track of what the inode size is ON DISK, not 1050 * in memory. During truncate, i_size is set to the new size by 1051 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1052 * set i_disksize to 0 until the truncate is actually under way. 1053 * 1054 * The intent is that i_disksize always represents the blocks which 1055 * are used by this file. This allows recovery to restart truncate 1056 * on orphans if we crash during truncate. We actually write i_disksize 1057 * into the on-disk inode when writing inodes out, instead of i_size. 1058 * 1059 * The only time when i_disksize and i_size may be different is when 1060 * a truncate is in progress. The only things which change i_disksize 1061 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1062 */ 1063 loff_t i_disksize; 1064 1065 /* 1066 * i_data_sem is for serialising ext4_truncate() against 1067 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1068 * data tree are chopped off during truncate. We can't do that in 1069 * ext4 because whenever we perform intermediate commits during 1070 * truncate, the inode and all the metadata blocks *must* be in a 1071 * consistent state which allows truncation of the orphans to restart 1072 * during recovery. Hence we must fix the get_block-vs-truncate race 1073 * by other means, so we have i_data_sem. 1074 */ 1075 struct rw_semaphore i_data_sem; 1076 /* 1077 * i_mmap_sem is for serializing page faults with truncate / punch hole 1078 * operations. We have to make sure that new page cannot be faulted in 1079 * a section of the inode that is being punched. We cannot easily use 1080 * i_data_sem for this since we need protection for the whole punch 1081 * operation and i_data_sem ranks below transaction start so we have 1082 * to occasionally drop it. 1083 */ 1084 struct rw_semaphore i_mmap_sem; 1085 struct inode vfs_inode; 1086 struct jbd2_inode *jinode; 1087 1088 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1089 1090 /* 1091 * File creation time. Its function is same as that of 1092 * struct timespec64 i_{a,c,m}time in the generic inode. 1093 */ 1094 struct timespec64 i_crtime; 1095 1096 /* mballoc */ 1097 atomic_t i_prealloc_active; 1098 struct list_head i_prealloc_list; 1099 spinlock_t i_prealloc_lock; 1100 1101 /* extents status tree */ 1102 struct ext4_es_tree i_es_tree; 1103 rwlock_t i_es_lock; 1104 struct list_head i_es_list; 1105 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1106 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1107 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1108 extents to shrink. Protected by 1109 i_es_lock */ 1110 1111 /* ialloc */ 1112 ext4_group_t i_last_alloc_group; 1113 1114 /* allocation reservation info for delalloc */ 1115 /* In case of bigalloc, this refer to clusters rather than blocks */ 1116 unsigned int i_reserved_data_blocks; 1117 1118 /* pending cluster reservations for bigalloc file systems */ 1119 struct ext4_pending_tree i_pending_tree; 1120 1121 /* on-disk additional length */ 1122 __u16 i_extra_isize; 1123 1124 /* Indicate the inline data space. */ 1125 u16 i_inline_off; 1126 u16 i_inline_size; 1127 1128#ifdef CONFIG_QUOTA 1129 /* quota space reservation, managed internally by quota code */ 1130 qsize_t i_reserved_quota; 1131#endif 1132 1133 /* Lock protecting lists below */ 1134 spinlock_t i_completed_io_lock; 1135 /* 1136 * Completed IOs that need unwritten extents handling and have 1137 * transaction reserved 1138 */ 1139 struct list_head i_rsv_conversion_list; 1140 struct work_struct i_rsv_conversion_work; 1141 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1142 1143 spinlock_t i_block_reservation_lock; 1144 1145 /* 1146 * Transactions that contain inode's metadata needed to complete 1147 * fsync and fdatasync, respectively. 1148 */ 1149 tid_t i_sync_tid; 1150 tid_t i_datasync_tid; 1151 1152#ifdef CONFIG_QUOTA 1153 struct dquot *i_dquot[MAXQUOTAS]; 1154#endif 1155 1156 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1157 __u32 i_csum_seed; 1158 1159 kprojid_t i_projid; 1160}; 1161 1162/* 1163 * File system states 1164 */ 1165#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1166#define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1167#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1168#define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1169 1170/* 1171 * Misc. filesystem flags 1172 */ 1173#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1174#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1175#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1176 1177/* 1178 * Mount flags set via mount options or defaults 1179 */ 1180#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1181#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1182#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1183#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1184#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1185#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1186#define EXT4_MOUNT_ERRORS_MASK 0x00070 1187#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1188#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1189#ifdef CONFIG_FS_DAX 1190#define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1191#else 1192#define EXT4_MOUNT_DAX_ALWAYS 0 1193#endif 1194#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1195#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1196#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1197#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1198#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1199#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1200#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1201#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1202#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1203#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1204#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1205#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1206 * enable enforcement for hidden 1207 * quota files */ 1208#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1209 * enforcement for hidden quota 1210 * files */ 1211#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1212 * enforcement */ 1213#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1214#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1215#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1216#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1217#define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000 1218#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1219#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1220#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1221#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1222#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1223 1224/* 1225 * Mount flags set either automatically (could not be set by mount option) 1226 * based on per file system feature or property or in special cases such as 1227 * distinguishing between explicit mount option definition and default. 1228 */ 1229#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1230 specified delalloc */ 1231#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1232 size of blocksize * 8 1233 blocks */ 1234#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1235 file systems */ 1236#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1237 specified journal checksum */ 1238 1239#define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1240#define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1241#define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1242 1243 1244#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1245 ~EXT4_MOUNT_##opt 1246#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1247 EXT4_MOUNT_##opt 1248#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1249 EXT4_MOUNT_##opt) 1250 1251#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1252 ~EXT4_MOUNT2_##opt 1253#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1254 EXT4_MOUNT2_##opt 1255#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1256 EXT4_MOUNT2_##opt) 1257 1258#define ext4_test_and_set_bit __test_and_set_bit_le 1259#define ext4_set_bit __set_bit_le 1260#define ext4_set_bit_atomic ext2_set_bit_atomic 1261#define ext4_test_and_clear_bit __test_and_clear_bit_le 1262#define ext4_clear_bit __clear_bit_le 1263#define ext4_clear_bit_atomic ext2_clear_bit_atomic 1264#define ext4_test_bit test_bit_le 1265#define ext4_find_next_zero_bit find_next_zero_bit_le 1266#define ext4_find_next_bit find_next_bit_le 1267 1268extern void ext4_set_bits(void *bm, int cur, int len); 1269 1270/* 1271 * Maximal mount counts between two filesystem checks 1272 */ 1273#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1274#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1275 1276/* 1277 * Behaviour when detecting errors 1278 */ 1279#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1280#define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1281#define EXT4_ERRORS_PANIC 3 /* Panic */ 1282#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1283 1284/* Metadata checksum algorithm codes */ 1285#define EXT4_CRC32C_CHKSUM 1 1286 1287/* 1288 * Structure of the super block 1289 */ 1290struct ext4_super_block { 1291/*00*/ __le32 s_inodes_count; /* Inodes count */ 1292 __le32 s_blocks_count_lo; /* Blocks count */ 1293 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1294 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1295/*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1296 __le32 s_first_data_block; /* First Data Block */ 1297 __le32 s_log_block_size; /* Block size */ 1298 __le32 s_log_cluster_size; /* Allocation cluster size */ 1299/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1300 __le32 s_clusters_per_group; /* # Clusters per group */ 1301 __le32 s_inodes_per_group; /* # Inodes per group */ 1302 __le32 s_mtime; /* Mount time */ 1303/*30*/ __le32 s_wtime; /* Write time */ 1304 __le16 s_mnt_count; /* Mount count */ 1305 __le16 s_max_mnt_count; /* Maximal mount count */ 1306 __le16 s_magic; /* Magic signature */ 1307 __le16 s_state; /* File system state */ 1308 __le16 s_errors; /* Behaviour when detecting errors */ 1309 __le16 s_minor_rev_level; /* minor revision level */ 1310/*40*/ __le32 s_lastcheck; /* time of last check */ 1311 __le32 s_checkinterval; /* max. time between checks */ 1312 __le32 s_creator_os; /* OS */ 1313 __le32 s_rev_level; /* Revision level */ 1314/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1315 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1316 /* 1317 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1318 * 1319 * Note: the difference between the compatible feature set and 1320 * the incompatible feature set is that if there is a bit set 1321 * in the incompatible feature set that the kernel doesn't 1322 * know about, it should refuse to mount the filesystem. 1323 * 1324 * e2fsck's requirements are more strict; if it doesn't know 1325 * about a feature in either the compatible or incompatible 1326 * feature set, it must abort and not try to meddle with 1327 * things it doesn't understand... 1328 */ 1329 __le32 s_first_ino; /* First non-reserved inode */ 1330 __le16 s_inode_size; /* size of inode structure */ 1331 __le16 s_block_group_nr; /* block group # of this superblock */ 1332 __le32 s_feature_compat; /* compatible feature set */ 1333/*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1334 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1335/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1336/*78*/ char s_volume_name[16]; /* volume name */ 1337/*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1338/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1339 /* 1340 * Performance hints. Directory preallocation should only 1341 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1342 */ 1343 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1344 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1345 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1346 /* 1347 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1348 */ 1349/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1350/*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1351 __le32 s_journal_dev; /* device number of journal file */ 1352 __le32 s_last_orphan; /* start of list of inodes to delete */ 1353 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1354 __u8 s_def_hash_version; /* Default hash version to use */ 1355 __u8 s_jnl_backup_type; 1356 __le16 s_desc_size; /* size of group descriptor */ 1357/*100*/ __le32 s_default_mount_opts; 1358 __le32 s_first_meta_bg; /* First metablock block group */ 1359 __le32 s_mkfs_time; /* When the filesystem was created */ 1360 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1361 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1362/*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1363 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1364 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1365 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1366 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1367 __le32 s_flags; /* Miscellaneous flags */ 1368 __le16 s_raid_stride; /* RAID stride */ 1369 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1370 __le64 s_mmp_block; /* Block for multi-mount protection */ 1371 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1372 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1373 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1374 __u8 s_encryption_level; /* versioning level for encryption */ 1375 __u8 s_reserved_pad; /* Padding to next 32bits */ 1376 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1377 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1378 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1379 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1380 snapshot's future use */ 1381 __le32 s_snapshot_list; /* inode number of the head of the 1382 on-disk snapshot list */ 1383#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1384 __le32 s_error_count; /* number of fs errors */ 1385 __le32 s_first_error_time; /* first time an error happened */ 1386 __le32 s_first_error_ino; /* inode involved in first error */ 1387 __le64 s_first_error_block; /* block involved of first error */ 1388 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1389 __le32 s_first_error_line; /* line number where error happened */ 1390 __le32 s_last_error_time; /* most recent time of an error */ 1391 __le32 s_last_error_ino; /* inode involved in last error */ 1392 __le32 s_last_error_line; /* line number where error happened */ 1393 __le64 s_last_error_block; /* block involved of last error */ 1394 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1395#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1396 __u8 s_mount_opts[64]; 1397 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1398 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1399 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1400 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1401 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1402 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1403 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1404 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1405 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1406 __u8 s_wtime_hi; 1407 __u8 s_mtime_hi; 1408 __u8 s_mkfs_time_hi; 1409 __u8 s_lastcheck_hi; 1410 __u8 s_first_error_time_hi; 1411 __u8 s_last_error_time_hi; 1412 __u8 s_first_error_errcode; 1413 __u8 s_last_error_errcode; 1414 __le16 s_encoding; /* Filename charset encoding */ 1415 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1416 __le32 s_reserved[95]; /* Padding to the end of the block */ 1417 __le32 s_checksum; /* crc32c(superblock) */ 1418}; 1419 1420#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1421 1422#ifdef __KERNEL__ 1423 1424/* Number of quota types we support */ 1425#define EXT4_MAXQUOTAS 3 1426 1427#define EXT4_ENC_UTF8_12_1 1 1428 1429/* 1430 * fourth extended-fs super-block data in memory 1431 */ 1432struct ext4_sb_info { 1433 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1434 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1435 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1436 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1437 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1438 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1439 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1440 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1441 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1442 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1443 unsigned long s_overhead; /* # of fs overhead clusters */ 1444 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1445 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1446 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1447 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1448 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1449 struct buffer_head * __rcu *s_group_desc; 1450 unsigned int s_mount_opt; 1451 unsigned int s_mount_opt2; 1452 unsigned long s_mount_flags; 1453 unsigned int s_def_mount_opt; 1454 ext4_fsblk_t s_sb_block; 1455 atomic64_t s_resv_clusters; 1456 kuid_t s_resuid; 1457 kgid_t s_resgid; 1458 unsigned short s_mount_state; 1459 unsigned short s_pad; 1460 int s_addr_per_block_bits; 1461 int s_desc_per_block_bits; 1462 int s_inode_size; 1463 int s_first_ino; 1464 unsigned int s_inode_readahead_blks; 1465 unsigned int s_inode_goal; 1466 u32 s_hash_seed[4]; 1467 int s_def_hash_version; 1468 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1469 struct percpu_counter s_freeclusters_counter; 1470 struct percpu_counter s_freeinodes_counter; 1471 struct percpu_counter s_dirs_counter; 1472 struct percpu_counter s_dirtyclusters_counter; 1473 struct percpu_counter s_sra_exceeded_retry_limit; 1474 struct blockgroup_lock *s_blockgroup_lock; 1475 struct proc_dir_entry *s_proc; 1476 struct kobject s_kobj; 1477 struct completion s_kobj_unregister; 1478 struct super_block *s_sb; 1479 struct buffer_head *s_mmp_bh; 1480 1481 /* Journaling */ 1482 struct journal_s *s_journal; 1483 struct list_head s_orphan; 1484 struct mutex s_orphan_lock; 1485 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1486 unsigned long s_commit_interval; 1487 u32 s_max_batch_time; 1488 u32 s_min_batch_time; 1489 struct block_device *s_journal_bdev; 1490#ifdef CONFIG_QUOTA 1491 /* Names of quota files with journalled quota */ 1492 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1493 int s_jquota_fmt; /* Format of quota to use */ 1494#endif 1495 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1496 struct ext4_system_blocks __rcu *s_system_blks; 1497 1498#ifdef EXTENTS_STATS 1499 /* ext4 extents stats */ 1500 unsigned long s_ext_min; 1501 unsigned long s_ext_max; 1502 unsigned long s_depth_max; 1503 spinlock_t s_ext_stats_lock; 1504 unsigned long s_ext_blocks; 1505 unsigned long s_ext_extents; 1506#endif 1507 1508 /* for buddy allocator */ 1509 struct ext4_group_info ** __rcu *s_group_info; 1510 struct inode *s_buddy_cache; 1511 spinlock_t s_md_lock; 1512 unsigned short *s_mb_offsets; 1513 unsigned int *s_mb_maxs; 1514 unsigned int s_group_info_size; 1515 unsigned int s_mb_free_pending; 1516 struct list_head s_freed_data_list; /* List of blocks to be freed 1517 after commit completed */ 1518 1519 /* tunables */ 1520 unsigned long s_stripe; 1521 unsigned int s_mb_stream_request; 1522 unsigned int s_mb_max_to_scan; 1523 unsigned int s_mb_min_to_scan; 1524 unsigned int s_mb_stats; 1525 unsigned int s_mb_order2_reqs; 1526 unsigned int s_mb_group_prealloc; 1527 unsigned int s_mb_max_inode_prealloc; 1528 unsigned int s_max_dir_size_kb; 1529 /* where last allocation was done - for stream allocation */ 1530 unsigned long s_mb_last_group; 1531 unsigned long s_mb_last_start; 1532 unsigned int s_mb_prefetch; 1533 unsigned int s_mb_prefetch_limit; 1534 1535 /* stats for buddy allocator */ 1536 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1537 atomic_t s_bal_success; /* we found long enough chunks */ 1538 atomic_t s_bal_allocated; /* in blocks */ 1539 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1540 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1541 atomic_t s_bal_goals; /* goal hits */ 1542 atomic_t s_bal_breaks; /* too long searches */ 1543 atomic_t s_bal_2orders; /* 2^order hits */ 1544 atomic64_t s_bal_cX_groups_considered[4]; 1545 atomic64_t s_bal_cX_hits[4]; 1546 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */ 1547 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1548 atomic64_t s_mb_generation_time; 1549 atomic_t s_mb_lost_chunks; 1550 atomic_t s_mb_preallocated; 1551 atomic_t s_mb_discarded; 1552 atomic_t s_lock_busy; 1553 1554 /* locality groups */ 1555 struct ext4_locality_group __percpu *s_locality_groups; 1556 1557 /* for write statistics */ 1558 unsigned long s_sectors_written_start; 1559 u64 s_kbytes_written; 1560 1561 /* the size of zero-out chunk */ 1562 unsigned int s_extent_max_zeroout_kb; 1563 1564 unsigned int s_log_groups_per_flex; 1565 struct flex_groups * __rcu *s_flex_groups; 1566 ext4_group_t s_flex_groups_allocated; 1567 1568 /* workqueue for reserved extent conversions (buffered io) */ 1569 struct workqueue_struct *rsv_conversion_wq; 1570 1571 /* timer for periodic error stats printing */ 1572 struct timer_list s_err_report; 1573 1574 /* Lazy inode table initialization info */ 1575 struct ext4_li_request *s_li_request; 1576 /* Wait multiplier for lazy initialization thread */ 1577 unsigned int s_li_wait_mult; 1578 1579 /* Kernel thread for multiple mount protection */ 1580 struct task_struct *s_mmp_tsk; 1581 1582 /* record the last minlen when FITRIM is called. */ 1583 unsigned long s_last_trim_minblks; 1584 1585 /* Reference to checksum algorithm driver via cryptoapi */ 1586 struct crypto_shash *s_chksum_driver; 1587 1588 /* Precomputed FS UUID checksum for seeding other checksums */ 1589 __u32 s_csum_seed; 1590 1591 /* Reclaim extents from extent status tree */ 1592 struct shrinker s_es_shrinker; 1593 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1594 long s_es_nr_inode; 1595 struct ext4_es_stats s_es_stats; 1596 struct mb_cache *s_ea_block_cache; 1597 struct mb_cache *s_ea_inode_cache; 1598 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1599 1600 /* Ratelimit ext4 messages. */ 1601 struct ratelimit_state s_err_ratelimit_state; 1602 struct ratelimit_state s_warning_ratelimit_state; 1603 struct ratelimit_state s_msg_ratelimit_state; 1604 atomic_t s_warning_count; 1605 atomic_t s_msg_count; 1606 1607 /* Encryption policy for '-o test_dummy_encryption' */ 1608 struct fscrypt_dummy_policy s_dummy_enc_policy; 1609 1610 /* 1611 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1612 * or EXTENTS flag. 1613 */ 1614 struct percpu_rw_semaphore s_writepages_rwsem; 1615 struct dax_device *s_daxdev; 1616#ifdef CONFIG_EXT4_DEBUG 1617 unsigned long s_simulate_fail; 1618#endif 1619 /* Record the errseq of the backing block device */ 1620 errseq_t s_bdev_wb_err; 1621 spinlock_t s_bdev_wb_lock; 1622 1623 /* Information about errors that happened during this mount */ 1624 spinlock_t s_error_lock; 1625 int s_add_error_count; 1626 int s_first_error_code; 1627 __u32 s_first_error_line; 1628 __u32 s_first_error_ino; 1629 __u64 s_first_error_block; 1630 const char *s_first_error_func; 1631 time64_t s_first_error_time; 1632 int s_last_error_code; 1633 __u32 s_last_error_line; 1634 __u32 s_last_error_ino; 1635 __u64 s_last_error_block; 1636 const char *s_last_error_func; 1637 time64_t s_last_error_time; 1638 /* 1639 * If we are in a context where we cannot update error information in 1640 * the on-disk superblock, we queue this work to do it. 1641 */ 1642 struct work_struct s_error_work; 1643 1644 /* Ext4 fast commit stuff */ 1645 atomic_t s_fc_subtid; 1646 atomic_t s_fc_ineligible_updates; 1647 /* 1648 * After commit starts, the main queue gets locked, and the further 1649 * updates get added in the staging queue. 1650 */ 1651#define FC_Q_MAIN 0 1652#define FC_Q_STAGING 1 1653 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1654 * that have data changes in them. 1655 */ 1656 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1657 unsigned int s_fc_bytes; 1658 /* 1659 * Main fast commit lock. This lock protects accesses to the 1660 * following fields: 1661 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1662 */ 1663 spinlock_t s_fc_lock; 1664 struct buffer_head *s_fc_bh; 1665 struct ext4_fc_stats s_fc_stats; 1666 u64 s_fc_avg_commit_time; 1667#ifdef CONFIG_EXT4_DEBUG 1668 int s_fc_debug_max_replay; 1669#endif 1670 struct ext4_fc_replay_state s_fc_replay_state; 1671}; 1672 1673static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1674{ 1675 return sb->s_fs_info; 1676} 1677static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1678{ 1679 return container_of(inode, struct ext4_inode_info, vfs_inode); 1680} 1681 1682static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1683{ 1684 return ino == EXT4_ROOT_INO || 1685 (ino >= EXT4_FIRST_INO(sb) && 1686 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1687} 1688 1689/* 1690 * Returns: sbi->field[index] 1691 * Used to access an array element from the following sbi fields which require 1692 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1693 * - s_group_desc 1694 * - s_group_info 1695 * - s_flex_group 1696 */ 1697#define sbi_array_rcu_deref(sbi, field, index) \ 1698({ \ 1699 typeof(*((sbi)->field)) _v; \ 1700 rcu_read_lock(); \ 1701 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1702 rcu_read_unlock(); \ 1703 _v; \ 1704}) 1705 1706/* 1707 * run-time mount flags 1708 */ 1709enum { 1710 EXT4_MF_MNTDIR_SAMPLED, 1711 EXT4_MF_FS_ABORTED, /* Fatal error detected */ 1712 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ 1713 EXT4_MF_FC_COMMITTING /* File system underoing a fast 1714 * commit. 1715 */ 1716}; 1717 1718static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1719{ 1720 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1721} 1722 1723static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1724{ 1725 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1726} 1727 1728static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1729{ 1730 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1731} 1732 1733 1734/* 1735 * Simulate_fail codes 1736 */ 1737#define EXT4_SIM_BBITMAP_EIO 1 1738#define EXT4_SIM_BBITMAP_CRC 2 1739#define EXT4_SIM_IBITMAP_EIO 3 1740#define EXT4_SIM_IBITMAP_CRC 4 1741#define EXT4_SIM_INODE_EIO 5 1742#define EXT4_SIM_INODE_CRC 6 1743#define EXT4_SIM_DIRBLOCK_EIO 7 1744#define EXT4_SIM_DIRBLOCK_CRC 8 1745 1746static inline bool ext4_simulate_fail(struct super_block *sb, 1747 unsigned long code) 1748{ 1749#ifdef CONFIG_EXT4_DEBUG 1750 struct ext4_sb_info *sbi = EXT4_SB(sb); 1751 1752 if (unlikely(sbi->s_simulate_fail == code)) { 1753 sbi->s_simulate_fail = 0; 1754 return true; 1755 } 1756#endif 1757 return false; 1758} 1759 1760static inline void ext4_simulate_fail_bh(struct super_block *sb, 1761 struct buffer_head *bh, 1762 unsigned long code) 1763{ 1764 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1765 clear_buffer_uptodate(bh); 1766} 1767 1768/* 1769 * Error number codes for s_{first,last}_error_errno 1770 * 1771 * Linux errno numbers are architecture specific, so we need to translate 1772 * them into something which is architecture independent. We don't define 1773 * codes for all errno's; just the ones which are most likely to be the cause 1774 * of an ext4_error() call. 1775 */ 1776#define EXT4_ERR_UNKNOWN 1 1777#define EXT4_ERR_EIO 2 1778#define EXT4_ERR_ENOMEM 3 1779#define EXT4_ERR_EFSBADCRC 4 1780#define EXT4_ERR_EFSCORRUPTED 5 1781#define EXT4_ERR_ENOSPC 6 1782#define EXT4_ERR_ENOKEY 7 1783#define EXT4_ERR_EROFS 8 1784#define EXT4_ERR_EFBIG 9 1785#define EXT4_ERR_EEXIST 10 1786#define EXT4_ERR_ERANGE 11 1787#define EXT4_ERR_EOVERFLOW 12 1788#define EXT4_ERR_EBUSY 13 1789#define EXT4_ERR_ENOTDIR 14 1790#define EXT4_ERR_ENOTEMPTY 15 1791#define EXT4_ERR_ESHUTDOWN 16 1792#define EXT4_ERR_EFAULT 17 1793 1794/* 1795 * Inode dynamic state flags 1796 */ 1797enum { 1798 EXT4_STATE_JDATA, /* journaled data exists */ 1799 EXT4_STATE_NEW, /* inode is newly created */ 1800 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1801 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1802 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1803 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1804 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1805 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1806 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1807 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1808 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1809 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1810}; 1811 1812#define EXT4_INODE_BIT_FNS(name, field, offset) \ 1813static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1814{ \ 1815 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1816} \ 1817static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1818{ \ 1819 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1820} \ 1821static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1822{ \ 1823 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1824} 1825 1826/* Add these declarations here only so that these functions can be 1827 * found by name. Otherwise, they are very hard to locate. */ 1828static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1829static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1830static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1831EXT4_INODE_BIT_FNS(flag, flags, 0) 1832 1833/* Add these declarations here only so that these functions can be 1834 * found by name. Otherwise, they are very hard to locate. */ 1835static inline int ext4_test_inode_state(struct inode *inode, int bit); 1836static inline void ext4_set_inode_state(struct inode *inode, int bit); 1837static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1838#if (BITS_PER_LONG < 64) 1839EXT4_INODE_BIT_FNS(state, state_flags, 0) 1840 1841static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1842{ 1843 (ei)->i_state_flags = 0; 1844} 1845#else 1846EXT4_INODE_BIT_FNS(state, flags, 32) 1847 1848static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1849{ 1850 /* We depend on the fact that callers will set i_flags */ 1851} 1852#endif 1853#else 1854/* Assume that user mode programs are passing in an ext4fs superblock, not 1855 * a kernel struct super_block. This will allow us to call the feature-test 1856 * macros from user land. */ 1857#define EXT4_SB(sb) (sb) 1858#endif 1859 1860static inline bool ext4_verity_in_progress(struct inode *inode) 1861{ 1862 return IS_ENABLED(CONFIG_FS_VERITY) && 1863 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1864} 1865 1866#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1867 1868/* 1869 * Codes for operating systems 1870 */ 1871#define EXT4_OS_LINUX 0 1872#define EXT4_OS_HURD 1 1873#define EXT4_OS_MASIX 2 1874#define EXT4_OS_FREEBSD 3 1875#define EXT4_OS_LITES 4 1876 1877/* 1878 * Revision levels 1879 */ 1880#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1881#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1882 1883#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1884#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1885 1886#define EXT4_GOOD_OLD_INODE_SIZE 128 1887 1888#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1889#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1890#define EXT4_TIMESTAMP_MIN S32_MIN 1891 1892/* 1893 * Feature set definitions 1894 */ 1895 1896#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1897#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1898#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1899#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1900#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1901#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1902#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1903/* 1904 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1905 * incompatible only if fast commit blocks are present in the FS. Since we 1906 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1907 * incompatible. We also have a JBD2 incompat feature, which gets set when 1908 * there are fast commit blocks present in the journal. 1909 */ 1910#define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1911#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1912 1913#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1914#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1915#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1916#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1917#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1918#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1919#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1920#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1921#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1922/* 1923 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1924 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1925 * all other data structures' checksums. However, the METADATA_CSUM and 1926 * GDT_CSUM bits are mutually exclusive. 1927 */ 1928#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1929#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1930#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1931#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1932 1933#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1934#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1935#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1936#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1937#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1938#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1939#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1940#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1941#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1942#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1943#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1944#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1945#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1946#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1947#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1948#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1949 1950extern void ext4_update_dynamic_rev(struct super_block *sb); 1951 1952#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1953static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1954{ \ 1955 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1956 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1957} \ 1958static inline void ext4_set_feature_##name(struct super_block *sb) \ 1959{ \ 1960 ext4_update_dynamic_rev(sb); \ 1961 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1962 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1963} \ 1964static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1965{ \ 1966 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1967 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1968} 1969 1970#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1971static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1972{ \ 1973 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1974 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1975} \ 1976static inline void ext4_set_feature_##name(struct super_block *sb) \ 1977{ \ 1978 ext4_update_dynamic_rev(sb); \ 1979 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1980 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1981} \ 1982static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1983{ \ 1984 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1985 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1986} 1987 1988#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1989static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1990{ \ 1991 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1992 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1993} \ 1994static inline void ext4_set_feature_##name(struct super_block *sb) \ 1995{ \ 1996 ext4_update_dynamic_rev(sb); \ 1997 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1998 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1999} \ 2000static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2001{ \ 2002 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2003 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2004} 2005 2006EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2007EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2008EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2009EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2010EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2011EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2012EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2013EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2014EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2015 2016EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2017EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2018EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2019EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2020EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2021EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2022EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2023EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2024EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2025EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2026EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2027EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2028EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2029 2030EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2031EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2032EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2033EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2034EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2035EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2036EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2037EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2038EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2039EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2040EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2041EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2042EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2043EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2044EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2045EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2046 2047#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2048#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2049 EXT4_FEATURE_INCOMPAT_META_BG) 2050#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2051 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2052 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2053 2054#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2055#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2056 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2057 EXT4_FEATURE_INCOMPAT_META_BG) 2058#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2059 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2060 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2061 2062#define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2063#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2064 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2065 EXT4_FEATURE_INCOMPAT_META_BG| \ 2066 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2067 EXT4_FEATURE_INCOMPAT_64BIT| \ 2068 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2069 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2070 EXT4_FEATURE_INCOMPAT_MMP | \ 2071 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2072 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2073 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2074 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2075 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2076#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2077 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2078 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2079 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2080 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2081 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2082 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2083 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2084 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2085 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2086 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2087 EXT4_FEATURE_RO_COMPAT_VERITY) 2088 2089#define EXTN_FEATURE_FUNCS(ver) \ 2090static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2091{ \ 2092 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2093 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2094} \ 2095static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2096{ \ 2097 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2098 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2099} \ 2100static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2101{ \ 2102 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2103 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2104} 2105 2106EXTN_FEATURE_FUNCS(2) 2107EXTN_FEATURE_FUNCS(3) 2108EXTN_FEATURE_FUNCS(4) 2109 2110static inline bool ext4_has_compat_features(struct super_block *sb) 2111{ 2112 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2113} 2114static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2115{ 2116 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2117} 2118static inline bool ext4_has_incompat_features(struct super_block *sb) 2119{ 2120 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2121} 2122 2123/* 2124 * Superblock flags 2125 */ 2126#define EXT4_FLAGS_RESIZING 0 2127#define EXT4_FLAGS_SHUTDOWN 1 2128#define EXT4_FLAGS_BDEV_IS_DAX 2 2129 2130static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2131{ 2132 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2133} 2134 2135 2136/* 2137 * Default values for user and/or group using reserved blocks 2138 */ 2139#define EXT4_DEF_RESUID 0 2140#define EXT4_DEF_RESGID 0 2141 2142/* 2143 * Default project ID 2144 */ 2145#define EXT4_DEF_PROJID 0 2146 2147#define EXT4_DEF_INODE_READAHEAD_BLKS 32 2148 2149/* 2150 * Default mount options 2151 */ 2152#define EXT4_DEFM_DEBUG 0x0001 2153#define EXT4_DEFM_BSDGROUPS 0x0002 2154#define EXT4_DEFM_XATTR_USER 0x0004 2155#define EXT4_DEFM_ACL 0x0008 2156#define EXT4_DEFM_UID16 0x0010 2157#define EXT4_DEFM_JMODE 0x0060 2158#define EXT4_DEFM_JMODE_DATA 0x0020 2159#define EXT4_DEFM_JMODE_ORDERED 0x0040 2160#define EXT4_DEFM_JMODE_WBACK 0x0060 2161#define EXT4_DEFM_NOBARRIER 0x0100 2162#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2163#define EXT4_DEFM_DISCARD 0x0400 2164#define EXT4_DEFM_NODELALLOC 0x0800 2165 2166/* 2167 * Default journal batch times 2168 */ 2169#define EXT4_DEF_MIN_BATCH_TIME 0 2170#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2171 2172/* 2173 * Minimum number of groups in a flexgroup before we separate out 2174 * directories into the first block group of a flexgroup 2175 */ 2176#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2177 2178/* 2179 * Structure of a directory entry 2180 */ 2181#define EXT4_NAME_LEN 255 2182/* 2183 * Base length of the ext4 directory entry excluding the name length 2184 */ 2185#define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) 2186 2187struct ext4_dir_entry { 2188 __le32 inode; /* Inode number */ 2189 __le16 rec_len; /* Directory entry length */ 2190 __le16 name_len; /* Name length */ 2191 char name[EXT4_NAME_LEN]; /* File name */ 2192}; 2193 2194/* 2195 * The new version of the directory entry. Since EXT4 structures are 2196 * stored in intel byte order, and the name_len field could never be 2197 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2198 * file_type field. 2199 */ 2200struct ext4_dir_entry_2 { 2201 __le32 inode; /* Inode number */ 2202 __le16 rec_len; /* Directory entry length */ 2203 __u8 name_len; /* Name length */ 2204 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2205 char name[EXT4_NAME_LEN]; /* File name */ 2206}; 2207 2208/* 2209 * This is a bogus directory entry at the end of each leaf block that 2210 * records checksums. 2211 */ 2212struct ext4_dir_entry_tail { 2213 __le32 det_reserved_zero1; /* Pretend to be unused */ 2214 __le16 det_rec_len; /* 12 */ 2215 __u8 det_reserved_zero2; /* Zero name length */ 2216 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2217 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2218}; 2219 2220#define EXT4_DIRENT_TAIL(block, blocksize) \ 2221 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2222 ((blocksize) - \ 2223 sizeof(struct ext4_dir_entry_tail)))) 2224 2225/* 2226 * Ext4 directory file types. Only the low 3 bits are used. The 2227 * other bits are reserved for now. 2228 */ 2229#define EXT4_FT_UNKNOWN 0 2230#define EXT4_FT_REG_FILE 1 2231#define EXT4_FT_DIR 2 2232#define EXT4_FT_CHRDEV 3 2233#define EXT4_FT_BLKDEV 4 2234#define EXT4_FT_FIFO 5 2235#define EXT4_FT_SOCK 6 2236#define EXT4_FT_SYMLINK 7 2237 2238#define EXT4_FT_MAX 8 2239 2240#define EXT4_FT_DIR_CSUM 0xDE 2241 2242/* 2243 * EXT4_DIR_PAD defines the directory entries boundaries 2244 * 2245 * NOTE: It must be a multiple of 4 2246 */ 2247#define EXT4_DIR_PAD 4 2248#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2249#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2250 ~EXT4_DIR_ROUND) 2251#define EXT4_MAX_REC_LEN ((1<<16)-1) 2252 2253/* 2254 * If we ever get support for fs block sizes > page_size, we'll need 2255 * to remove the #if statements in the next two functions... 2256 */ 2257static inline unsigned int 2258ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2259{ 2260 unsigned len = le16_to_cpu(dlen); 2261 2262#if (PAGE_SIZE >= 65536) 2263 if (len == EXT4_MAX_REC_LEN || len == 0) 2264 return blocksize; 2265 return (len & 65532) | ((len & 3) << 16); 2266#else 2267 return len; 2268#endif 2269} 2270 2271static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2272{ 2273 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2274 BUG(); 2275#if (PAGE_SIZE >= 65536) 2276 if (len < 65536) 2277 return cpu_to_le16(len); 2278 if (len == blocksize) { 2279 if (blocksize == 65536) 2280 return cpu_to_le16(EXT4_MAX_REC_LEN); 2281 else 2282 return cpu_to_le16(0); 2283 } 2284 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2285#else 2286 return cpu_to_le16(len); 2287#endif 2288} 2289 2290/* 2291 * Hash Tree Directory indexing 2292 * (c) Daniel Phillips, 2001 2293 */ 2294 2295#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2296 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2297#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2298 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2299#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2300 2301/* Legal values for the dx_root hash_version field: */ 2302 2303#define DX_HASH_LEGACY 0 2304#define DX_HASH_HALF_MD4 1 2305#define DX_HASH_TEA 2 2306#define DX_HASH_LEGACY_UNSIGNED 3 2307#define DX_HASH_HALF_MD4_UNSIGNED 4 2308#define DX_HASH_TEA_UNSIGNED 5 2309 2310static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2311 const void *address, unsigned int length) 2312{ 2313 struct { 2314 struct shash_desc shash; 2315 char ctx[4]; 2316 } desc; 2317 2318 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2319 2320 desc.shash.tfm = sbi->s_chksum_driver; 2321 *(u32 *)desc.ctx = crc; 2322 2323 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2324 2325 return *(u32 *)desc.ctx; 2326} 2327 2328#ifdef __KERNEL__ 2329 2330/* hash info structure used by the directory hash */ 2331struct dx_hash_info 2332{ 2333 u32 hash; 2334 u32 minor_hash; 2335 int hash_version; 2336 u32 *seed; 2337}; 2338 2339 2340/* 32 and 64 bit signed EOF for dx directories */ 2341#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2342#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2343 2344 2345/* 2346 * Control parameters used by ext4_htree_next_block 2347 */ 2348#define HASH_NB_ALWAYS 1 2349 2350struct ext4_filename { 2351 const struct qstr *usr_fname; 2352 struct fscrypt_str disk_name; 2353 struct dx_hash_info hinfo; 2354#ifdef CONFIG_FS_ENCRYPTION 2355 struct fscrypt_str crypto_buf; 2356#endif 2357#ifdef CONFIG_UNICODE 2358 struct fscrypt_str cf_name; 2359#endif 2360}; 2361 2362#define fname_name(p) ((p)->disk_name.name) 2363#define fname_len(p) ((p)->disk_name.len) 2364 2365/* 2366 * Describe an inode's exact location on disk and in memory 2367 */ 2368struct ext4_iloc 2369{ 2370 struct buffer_head *bh; 2371 unsigned long offset; 2372 ext4_group_t block_group; 2373}; 2374 2375static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2376{ 2377 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2378} 2379 2380static inline bool ext4_is_quota_file(struct inode *inode) 2381{ 2382 return IS_NOQUOTA(inode) && 2383 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2384} 2385 2386/* 2387 * This structure is stuffed into the struct file's private_data field 2388 * for directories. It is where we put information so that we can do 2389 * readdir operations in hash tree order. 2390 */ 2391struct dir_private_info { 2392 struct rb_root root; 2393 struct rb_node *curr_node; 2394 struct fname *extra_fname; 2395 loff_t last_pos; 2396 __u32 curr_hash; 2397 __u32 curr_minor_hash; 2398 __u32 next_hash; 2399}; 2400 2401/* calculate the first block number of the group */ 2402static inline ext4_fsblk_t 2403ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2404{ 2405 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2406 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2407} 2408 2409/* 2410 * Special error return code only used by dx_probe() and its callers. 2411 */ 2412#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2413 2414/* htree levels for ext4 */ 2415#define EXT4_HTREE_LEVEL_COMPAT 2 2416#define EXT4_HTREE_LEVEL 3 2417 2418static inline int ext4_dir_htree_level(struct super_block *sb) 2419{ 2420 return ext4_has_feature_largedir(sb) ? 2421 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2422} 2423 2424/* 2425 * Timeout and state flag for lazy initialization inode thread. 2426 */ 2427#define EXT4_DEF_LI_WAIT_MULT 10 2428#define EXT4_DEF_LI_MAX_START_DELAY 5 2429#define EXT4_LAZYINIT_QUIT 0x0001 2430#define EXT4_LAZYINIT_RUNNING 0x0002 2431 2432/* 2433 * Lazy inode table initialization info 2434 */ 2435struct ext4_lazy_init { 2436 unsigned long li_state; 2437 struct list_head li_request_list; 2438 struct mutex li_list_mtx; 2439}; 2440 2441enum ext4_li_mode { 2442 EXT4_LI_MODE_PREFETCH_BBITMAP, 2443 EXT4_LI_MODE_ITABLE, 2444}; 2445 2446struct ext4_li_request { 2447 struct super_block *lr_super; 2448 enum ext4_li_mode lr_mode; 2449 ext4_group_t lr_first_not_zeroed; 2450 ext4_group_t lr_next_group; 2451 struct list_head lr_request; 2452 unsigned long lr_next_sched; 2453 unsigned long lr_timeout; 2454}; 2455 2456struct ext4_features { 2457 struct kobject f_kobj; 2458 struct completion f_kobj_unregister; 2459}; 2460 2461/* 2462 * This structure will be used for multiple mount protection. It will be 2463 * written into the block number saved in the s_mmp_block field in the 2464 * superblock. Programs that check MMP should assume that if 2465 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2466 * to use the filesystem, regardless of how old the timestamp is. 2467 */ 2468#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2469#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2470#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2471#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2472 2473struct mmp_struct { 2474 __le32 mmp_magic; /* Magic number for MMP */ 2475 __le32 mmp_seq; /* Sequence no. updated periodically */ 2476 2477 /* 2478 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2479 * purposes and do not affect the correctness of the algorithm 2480 */ 2481 __le64 mmp_time; /* Time last updated */ 2482 char mmp_nodename[64]; /* Node which last updated MMP block */ 2483 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2484 2485 /* 2486 * mmp_check_interval is used to verify if the MMP block has been 2487 * updated on the block device. The value is updated based on the 2488 * maximum time to write the MMP block during an update cycle. 2489 */ 2490 __le16 mmp_check_interval; 2491 2492 __le16 mmp_pad1; 2493 __le32 mmp_pad2[226]; 2494 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2495}; 2496 2497/* arguments passed to the mmp thread */ 2498struct mmpd_data { 2499 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2500 struct super_block *sb; /* super block of the fs */ 2501}; 2502 2503/* 2504 * Check interval multiplier 2505 * The MMP block is written every update interval and initially checked every 2506 * update interval x the multiplier (the value is then adapted based on the 2507 * write latency). The reason is that writes can be delayed under load and we 2508 * don't want readers to incorrectly assume that the filesystem is no longer 2509 * in use. 2510 */ 2511#define EXT4_MMP_CHECK_MULT 2UL 2512 2513/* 2514 * Minimum interval for MMP checking in seconds. 2515 */ 2516#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2517 2518/* 2519 * Maximum interval for MMP checking in seconds. 2520 */ 2521#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2522 2523/* 2524 * Function prototypes 2525 */ 2526 2527/* 2528 * Ok, these declarations are also in <linux/kernel.h> but none of the 2529 * ext4 source programs needs to include it so they are duplicated here. 2530 */ 2531# define NORET_TYPE /**/ 2532# define ATTRIB_NORET __attribute__((noreturn)) 2533# define NORET_AND noreturn, 2534 2535/* bitmap.c */ 2536extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2537void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2538 struct ext4_group_desc *gdp, 2539 struct buffer_head *bh, int sz); 2540int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2541 struct ext4_group_desc *gdp, 2542 struct buffer_head *bh, int sz); 2543void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2544 struct ext4_group_desc *gdp, 2545 struct buffer_head *bh); 2546int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2547 struct ext4_group_desc *gdp, 2548 struct buffer_head *bh); 2549 2550/* balloc.c */ 2551extern void ext4_get_group_no_and_offset(struct super_block *sb, 2552 ext4_fsblk_t blocknr, 2553 ext4_group_t *blockgrpp, 2554 ext4_grpblk_t *offsetp); 2555extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2556 ext4_fsblk_t block); 2557 2558extern unsigned int ext4_block_group(struct super_block *sb, 2559 ext4_fsblk_t blocknr); 2560extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2561 ext4_fsblk_t blocknr); 2562extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2563extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2564 ext4_group_t group); 2565extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2566 ext4_fsblk_t goal, 2567 unsigned int flags, 2568 unsigned long *count, 2569 int *errp); 2570extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2571 s64 nclusters, unsigned int flags); 2572extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2573extern void ext4_check_blocks_bitmap(struct super_block *); 2574extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2575 ext4_group_t block_group, 2576 struct buffer_head ** bh); 2577extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2578 ext4_group_t group); 2579extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2580 2581extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2582 ext4_group_t block_group, 2583 bool ignore_locked); 2584extern int ext4_wait_block_bitmap(struct super_block *sb, 2585 ext4_group_t block_group, 2586 struct buffer_head *bh); 2587extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2588 ext4_group_t block_group); 2589extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2590 ext4_group_t block_group, 2591 struct ext4_group_desc *gdp); 2592ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2593 2594#ifdef CONFIG_UNICODE 2595extern void ext4_fname_setup_ci_filename(struct inode *dir, 2596 const struct qstr *iname, 2597 struct fscrypt_str *fname); 2598#endif 2599 2600#ifdef CONFIG_FS_ENCRYPTION 2601static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2602 const struct fscrypt_name *src) 2603{ 2604 memset(dst, 0, sizeof(*dst)); 2605 2606 dst->usr_fname = src->usr_fname; 2607 dst->disk_name = src->disk_name; 2608 dst->hinfo.hash = src->hash; 2609 dst->hinfo.minor_hash = src->minor_hash; 2610 dst->crypto_buf = src->crypto_buf; 2611} 2612 2613static inline int ext4_fname_setup_filename(struct inode *dir, 2614 const struct qstr *iname, 2615 int lookup, 2616 struct ext4_filename *fname) 2617{ 2618 struct fscrypt_name name; 2619 int err; 2620 2621 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2622 if (err) 2623 return err; 2624 2625 ext4_fname_from_fscrypt_name(fname, &name); 2626 2627#ifdef CONFIG_UNICODE 2628 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2629#endif 2630 return 0; 2631} 2632 2633static inline int ext4_fname_prepare_lookup(struct inode *dir, 2634 struct dentry *dentry, 2635 struct ext4_filename *fname) 2636{ 2637 struct fscrypt_name name; 2638 int err; 2639 2640 err = fscrypt_prepare_lookup(dir, dentry, &name); 2641 if (err) 2642 return err; 2643 2644 ext4_fname_from_fscrypt_name(fname, &name); 2645 2646#ifdef CONFIG_UNICODE 2647 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2648#endif 2649 return 0; 2650} 2651 2652static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2653{ 2654 struct fscrypt_name name; 2655 2656 name.crypto_buf = fname->crypto_buf; 2657 fscrypt_free_filename(&name); 2658 2659 fname->crypto_buf.name = NULL; 2660 fname->usr_fname = NULL; 2661 fname->disk_name.name = NULL; 2662 2663#ifdef CONFIG_UNICODE 2664 kfree(fname->cf_name.name); 2665 fname->cf_name.name = NULL; 2666#endif 2667} 2668#else /* !CONFIG_FS_ENCRYPTION */ 2669static inline int ext4_fname_setup_filename(struct inode *dir, 2670 const struct qstr *iname, 2671 int lookup, 2672 struct ext4_filename *fname) 2673{ 2674 fname->usr_fname = iname; 2675 fname->disk_name.name = (unsigned char *) iname->name; 2676 fname->disk_name.len = iname->len; 2677 2678#ifdef CONFIG_UNICODE 2679 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2680#endif 2681 2682 return 0; 2683} 2684 2685static inline int ext4_fname_prepare_lookup(struct inode *dir, 2686 struct dentry *dentry, 2687 struct ext4_filename *fname) 2688{ 2689 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2690} 2691 2692static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2693{ 2694#ifdef CONFIG_UNICODE 2695 kfree(fname->cf_name.name); 2696 fname->cf_name.name = NULL; 2697#endif 2698} 2699#endif /* !CONFIG_FS_ENCRYPTION */ 2700 2701/* dir.c */ 2702extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2703 struct file *, 2704 struct ext4_dir_entry_2 *, 2705 struct buffer_head *, char *, int, 2706 unsigned int); 2707#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2708 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2709 (de), (bh), (buf), (size), (offset))) 2710extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2711 __u32 minor_hash, 2712 struct ext4_dir_entry_2 *dirent, 2713 struct fscrypt_str *ent_name); 2714extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2715extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2716 struct buffer_head *bh, 2717 void *buf, int buf_size, 2718 struct ext4_filename *fname, 2719 struct ext4_dir_entry_2 **dest_de); 2720void ext4_insert_dentry(struct inode *inode, 2721 struct ext4_dir_entry_2 *de, 2722 int buf_size, 2723 struct ext4_filename *fname); 2724static inline void ext4_update_dx_flag(struct inode *inode) 2725{ 2726 if (!ext4_has_feature_dir_index(inode->i_sb) && 2727 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2728 /* ext4_iget() should have caught this... */ 2729 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2730 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2731 } 2732} 2733static const unsigned char ext4_filetype_table[] = { 2734 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2735}; 2736 2737static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2738{ 2739 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2740 return DT_UNKNOWN; 2741 2742 return ext4_filetype_table[filetype]; 2743} 2744extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2745 void *buf, int buf_size); 2746 2747/* fsync.c */ 2748extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2749 2750/* hash.c */ 2751extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2752 struct dx_hash_info *hinfo); 2753 2754/* ialloc.c */ 2755extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2756extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2757 const struct qstr *qstr, __u32 goal, 2758 uid_t *owner, __u32 i_flags, 2759 int handle_type, unsigned int line_no, 2760 int nblocks); 2761 2762#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2763 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2764 i_flags, 0, 0, 0) 2765#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2766 type, nblocks) \ 2767 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2768 0, (type), __LINE__, (nblocks)) 2769 2770 2771extern void ext4_free_inode(handle_t *, struct inode *); 2772extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2773extern unsigned long ext4_count_free_inodes(struct super_block *); 2774extern unsigned long ext4_count_dirs(struct super_block *); 2775extern void ext4_check_inodes_bitmap(struct super_block *); 2776extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2777extern int ext4_init_inode_table(struct super_block *sb, 2778 ext4_group_t group, int barrier); 2779extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2780 2781/* fast_commit.c */ 2782int ext4_fc_info_show(struct seq_file *seq, void *v); 2783void ext4_fc_init(struct super_block *sb, journal_t *journal); 2784void ext4_fc_init_inode(struct inode *inode); 2785void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2786 ext4_lblk_t end); 2787void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2788 struct dentry *dentry); 2789void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2790 struct dentry *dentry); 2791void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2792void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2793void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2794 struct dentry *dentry); 2795void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2796void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2797void ext4_fc_mark_ineligible(struct super_block *sb, int reason); 2798void ext4_fc_start_ineligible(struct super_block *sb, int reason); 2799void ext4_fc_stop_ineligible(struct super_block *sb); 2800void ext4_fc_start_update(struct inode *inode); 2801void ext4_fc_stop_update(struct inode *inode); 2802void ext4_fc_del(struct inode *inode); 2803bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2804void ext4_fc_replay_cleanup(struct super_block *sb); 2805int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2806int __init ext4_fc_init_dentry_cache(void); 2807void ext4_fc_destroy_dentry_cache(void); 2808int ext4_fc_record_regions(struct super_block *sb, int ino, 2809 ext4_lblk_t lblk, ext4_fsblk_t pblk, 2810 int len, int replay); 2811 2812/* mballoc.c */ 2813extern const struct seq_operations ext4_mb_seq_groups_ops; 2814extern long ext4_mb_stats; 2815extern long ext4_mb_max_to_scan; 2816extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2817extern int ext4_mb_init(struct super_block *); 2818extern int ext4_mb_release(struct super_block *); 2819extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2820 struct ext4_allocation_request *, int *); 2821extern int ext4_mb_reserve_blocks(struct super_block *, int); 2822extern void ext4_discard_preallocations(struct inode *, unsigned int); 2823extern int __init ext4_init_mballoc(void); 2824extern void ext4_exit_mballoc(void); 2825extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2826 ext4_group_t group, 2827 unsigned int nr, int *cnt); 2828extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2829 unsigned int nr); 2830 2831extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2832 struct buffer_head *bh, ext4_fsblk_t block, 2833 unsigned long count, int flags); 2834extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2835 ext4_group_t ngroups); 2836extern int ext4_mb_add_groupinfo(struct super_block *sb, 2837 ext4_group_t i, struct ext4_group_desc *desc); 2838extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2839 ext4_fsblk_t block, unsigned long count); 2840extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2841extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2842extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2843 int len, int state); 2844 2845/* inode.c */ 2846void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2847 struct ext4_inode_info *ei); 2848int ext4_inode_is_fast_symlink(struct inode *inode); 2849struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2850struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2851int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2852 bool wait, struct buffer_head **bhs); 2853int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2854 struct buffer_head *bh_result, int create); 2855int ext4_get_block(struct inode *inode, sector_t iblock, 2856 struct buffer_head *bh_result, int create); 2857int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2858 struct buffer_head *bh, int create); 2859int ext4_walk_page_buffers(handle_t *handle, 2860 struct buffer_head *head, 2861 unsigned from, 2862 unsigned to, 2863 int *partial, 2864 int (*fn)(handle_t *handle, 2865 struct buffer_head *bh)); 2866int do_journal_get_write_access(handle_t *handle, 2867 struct buffer_head *bh); 2868#define FALL_BACK_TO_NONDELALLOC 1 2869#define CONVERT_INLINE_DATA 2 2870 2871typedef enum { 2872 EXT4_IGET_NORMAL = 0, 2873 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2874 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */ 2875 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */ 2876 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */ 2877} ext4_iget_flags; 2878 2879extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2880 ext4_iget_flags flags, const char *function, 2881 unsigned int line); 2882 2883#define ext4_iget(sb, ino, flags) \ 2884 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2885 2886extern int ext4_write_inode(struct inode *, struct writeback_control *); 2887extern int ext4_setattr(struct dentry *, struct iattr *); 2888extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2889extern void ext4_evict_inode(struct inode *); 2890extern void ext4_clear_inode(struct inode *); 2891extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2892extern int ext4_sync_inode(handle_t *, struct inode *); 2893extern void ext4_dirty_inode(struct inode *, int); 2894extern int ext4_change_inode_journal_flag(struct inode *, int); 2895extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2896extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 2897 struct ext4_iloc *iloc); 2898extern int ext4_inode_attach_jinode(struct inode *inode); 2899extern int ext4_can_truncate(struct inode *inode); 2900extern int ext4_truncate(struct inode *); 2901extern int ext4_break_layouts(struct inode *); 2902extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 2903extern void ext4_set_inode_flags(struct inode *, bool init); 2904extern int ext4_alloc_da_blocks(struct inode *inode); 2905extern void ext4_set_aops(struct inode *inode); 2906extern int ext4_writepage_trans_blocks(struct inode *); 2907extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2908extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2909 loff_t lstart, loff_t lend); 2910extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2911extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2912extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2913extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2914extern void ext4_da_release_space(struct inode *inode, int to_free); 2915extern void ext4_da_update_reserve_space(struct inode *inode, 2916 int used, int quota_claim); 2917extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2918 ext4_fsblk_t pblk, ext4_lblk_t len); 2919 2920/* indirect.c */ 2921extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2922 struct ext4_map_blocks *map, int flags); 2923extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2924extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2925extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2926 ext4_lblk_t start, ext4_lblk_t end); 2927 2928/* ioctl.c */ 2929extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2930extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2931extern void ext4_reset_inode_seed(struct inode *inode); 2932 2933/* migrate.c */ 2934extern int ext4_ext_migrate(struct inode *); 2935extern int ext4_ind_migrate(struct inode *inode); 2936 2937/* namei.c */ 2938extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 2939 struct inode *inode); 2940extern int ext4_dirblock_csum_verify(struct inode *inode, 2941 struct buffer_head *bh); 2942extern int ext4_orphan_add(handle_t *, struct inode *); 2943extern int ext4_orphan_del(handle_t *, struct inode *); 2944extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2945 __u32 start_minor_hash, __u32 *next_hash); 2946extern int ext4_search_dir(struct buffer_head *bh, 2947 char *search_buf, 2948 int buf_size, 2949 struct inode *dir, 2950 struct ext4_filename *fname, 2951 unsigned int offset, 2952 struct ext4_dir_entry_2 **res_dir); 2953extern int ext4_generic_delete_entry(struct inode *dir, 2954 struct ext4_dir_entry_2 *de_del, 2955 struct buffer_head *bh, 2956 void *entry_buf, 2957 int buf_size, 2958 int csum_size); 2959extern bool ext4_empty_dir(struct inode *inode); 2960 2961/* resize.c */ 2962extern void ext4_kvfree_array_rcu(void *to_free); 2963extern int ext4_group_add(struct super_block *sb, 2964 struct ext4_new_group_data *input); 2965extern int ext4_group_extend(struct super_block *sb, 2966 struct ext4_super_block *es, 2967 ext4_fsblk_t n_blocks_count); 2968extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2969 2970/* super.c */ 2971extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2972 sector_t block, int op_flags); 2973extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 2974 sector_t block); 2975extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 2976 bh_end_io_t *end_io); 2977extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 2978 bh_end_io_t *end_io); 2979extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 2980extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 2981extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2982extern int ext4_calculate_overhead(struct super_block *sb); 2983extern void ext4_superblock_csum_set(struct super_block *sb); 2984extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2985 ext4_group_t ngroup); 2986extern const char *ext4_decode_error(struct super_block *sb, int errno, 2987 char nbuf[16]); 2988extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2989 ext4_group_t block_group, 2990 unsigned int flags); 2991extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb, 2992 ext4_group_t block_group); 2993 2994extern __printf(7, 8) 2995void __ext4_error(struct super_block *, const char *, unsigned int, bool, 2996 int, __u64, const char *, ...); 2997extern __printf(6, 7) 2998void __ext4_error_inode(struct inode *, const char *, unsigned int, 2999 ext4_fsblk_t, int, const char *, ...); 3000extern __printf(5, 6) 3001void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3002 const char *, ...); 3003extern void __ext4_std_error(struct super_block *, const char *, 3004 unsigned int, int); 3005extern __printf(4, 5) 3006void __ext4_warning(struct super_block *, const char *, unsigned int, 3007 const char *, ...); 3008extern __printf(4, 5) 3009void __ext4_warning_inode(const struct inode *inode, const char *function, 3010 unsigned int line, const char *fmt, ...); 3011extern __printf(3, 4) 3012void __ext4_msg(struct super_block *, const char *, const char *, ...); 3013extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3014 const char *, unsigned int, const char *); 3015extern __printf(7, 8) 3016void __ext4_grp_locked_error(const char *, unsigned int, 3017 struct super_block *, ext4_group_t, 3018 unsigned long, ext4_fsblk_t, 3019 const char *, ...); 3020 3021#define EXT4_ERROR_INODE(inode, fmt, a...) \ 3022 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3023 3024#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3025 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3026 3027#define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3028 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3029 (fmt), ## a) 3030 3031#define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3032 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3033 3034#define ext4_abort(sb, err, fmt, a...) \ 3035 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3036 3037#ifdef CONFIG_PRINTK 3038 3039#define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3040 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3041#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3042 __ext4_error_inode((inode), (func), (line), (block), \ 3043 (err), (fmt), ##__VA_ARGS__) 3044#define ext4_error_file(file, func, line, block, fmt, ...) \ 3045 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3046#define ext4_error(sb, fmt, ...) \ 3047 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3048 ##__VA_ARGS__) 3049#define ext4_error_err(sb, err, fmt, ...) \ 3050 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3051 ##__VA_ARGS__) 3052#define ext4_warning(sb, fmt, ...) \ 3053 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3054#define ext4_warning_inode(inode, fmt, ...) \ 3055 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3056#define ext4_msg(sb, level, fmt, ...) \ 3057 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3058#define dump_mmp_msg(sb, mmp, msg) \ 3059 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3060#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3061 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3062 fmt, ##__VA_ARGS__) 3063 3064#else 3065 3066#define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3067do { \ 3068 no_printk(fmt, ##__VA_ARGS__); \ 3069 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3070} while (0) 3071#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3072do { \ 3073 no_printk(fmt, ##__VA_ARGS__); \ 3074 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3075} while (0) 3076#define ext4_error_file(file, func, line, block, fmt, ...) \ 3077do { \ 3078 no_printk(fmt, ##__VA_ARGS__); \ 3079 __ext4_error_file(file, "", 0, block, " "); \ 3080} while (0) 3081#define ext4_error(sb, fmt, ...) \ 3082do { \ 3083 no_printk(fmt, ##__VA_ARGS__); \ 3084 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3085} while (0) 3086#define ext4_error_err(sb, err, fmt, ...) \ 3087do { \ 3088 no_printk(fmt, ##__VA_ARGS__); \ 3089 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3090} while (0) 3091#define ext4_warning(sb, fmt, ...) \ 3092do { \ 3093 no_printk(fmt, ##__VA_ARGS__); \ 3094 __ext4_warning(sb, "", 0, " "); \ 3095} while (0) 3096#define ext4_warning_inode(inode, fmt, ...) \ 3097do { \ 3098 no_printk(fmt, ##__VA_ARGS__); \ 3099 __ext4_warning_inode(inode, "", 0, " "); \ 3100} while (0) 3101#define ext4_msg(sb, level, fmt, ...) \ 3102do { \ 3103 no_printk(fmt, ##__VA_ARGS__); \ 3104 __ext4_msg(sb, "", " "); \ 3105} while (0) 3106#define dump_mmp_msg(sb, mmp, msg) \ 3107 __dump_mmp_msg(sb, mmp, "", 0, "") 3108#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3109do { \ 3110 no_printk(fmt, ##__VA_ARGS__); \ 3111 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3112} while (0) 3113 3114#endif 3115 3116extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3117 struct ext4_group_desc *bg); 3118extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3119 struct ext4_group_desc *bg); 3120extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3121 struct ext4_group_desc *bg); 3122extern __u32 ext4_free_group_clusters(struct super_block *sb, 3123 struct ext4_group_desc *bg); 3124extern __u32 ext4_free_inodes_count(struct super_block *sb, 3125 struct ext4_group_desc *bg); 3126extern __u32 ext4_used_dirs_count(struct super_block *sb, 3127 struct ext4_group_desc *bg); 3128extern __u32 ext4_itable_unused_count(struct super_block *sb, 3129 struct ext4_group_desc *bg); 3130extern void ext4_block_bitmap_set(struct super_block *sb, 3131 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3132extern void ext4_inode_bitmap_set(struct super_block *sb, 3133 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3134extern void ext4_inode_table_set(struct super_block *sb, 3135 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3136extern void ext4_free_group_clusters_set(struct super_block *sb, 3137 struct ext4_group_desc *bg, 3138 __u32 count); 3139extern void ext4_free_inodes_set(struct super_block *sb, 3140 struct ext4_group_desc *bg, __u32 count); 3141extern void ext4_used_dirs_set(struct super_block *sb, 3142 struct ext4_group_desc *bg, __u32 count); 3143extern void ext4_itable_unused_set(struct super_block *sb, 3144 struct ext4_group_desc *bg, __u32 count); 3145extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3146 struct ext4_group_desc *gdp); 3147extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3148 struct ext4_group_desc *gdp); 3149extern int ext4_register_li_request(struct super_block *sb, 3150 ext4_group_t first_not_zeroed); 3151 3152static inline int ext4_has_metadata_csum(struct super_block *sb) 3153{ 3154 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3155 !EXT4_SB(sb)->s_chksum_driver); 3156 3157 return ext4_has_feature_metadata_csum(sb) && 3158 (EXT4_SB(sb)->s_chksum_driver != NULL); 3159} 3160 3161static inline int ext4_has_group_desc_csum(struct super_block *sb) 3162{ 3163 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3164} 3165 3166#define ext4_read_incompat_64bit_val(es, name) \ 3167 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3168 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3169 le32_to_cpu(es->name##_lo)) 3170 3171static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3172{ 3173 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3174} 3175 3176static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3177{ 3178 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3179} 3180 3181static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3182{ 3183 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3184} 3185 3186static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3187 ext4_fsblk_t blk) 3188{ 3189 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3190 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3191} 3192 3193static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3194 ext4_fsblk_t blk) 3195{ 3196 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3197 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3198} 3199 3200static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3201 ext4_fsblk_t blk) 3202{ 3203 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3204 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3205} 3206 3207static inline loff_t ext4_isize(struct super_block *sb, 3208 struct ext4_inode *raw_inode) 3209{ 3210 if (ext4_has_feature_largedir(sb) || 3211 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3212 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3213 le32_to_cpu(raw_inode->i_size_lo); 3214 3215 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3216} 3217 3218static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3219{ 3220 raw_inode->i_size_lo = cpu_to_le32(i_size); 3221 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3222} 3223 3224/* 3225 * Reading s_groups_count requires using smp_rmb() afterwards. See 3226 * the locking protocol documented in the comments of ext4_group_add() 3227 * in resize.c 3228 */ 3229static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3230{ 3231 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3232 3233 smp_rmb(); 3234 return ngroups; 3235} 3236 3237static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3238 ext4_group_t block_group) 3239{ 3240 return block_group >> sbi->s_log_groups_per_flex; 3241} 3242 3243static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3244{ 3245 return 1 << sbi->s_log_groups_per_flex; 3246} 3247 3248#define ext4_std_error(sb, errno) \ 3249do { \ 3250 if ((errno)) \ 3251 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3252} while (0) 3253 3254#ifdef CONFIG_SMP 3255/* Each CPU can accumulate percpu_counter_batch clusters in their local 3256 * counters. So we need to make sure we have free clusters more 3257 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3258 */ 3259#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3260#else 3261#define EXT4_FREECLUSTERS_WATERMARK 0 3262#endif 3263 3264/* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3265static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3266{ 3267 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3268 !inode_is_locked(inode)); 3269 down_write(&EXT4_I(inode)->i_data_sem); 3270 if (newsize > EXT4_I(inode)->i_disksize) 3271 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3272 up_write(&EXT4_I(inode)->i_data_sem); 3273} 3274 3275/* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3276static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3277{ 3278 int changed = 0; 3279 3280 if (newsize > inode->i_size) { 3281 i_size_write(inode, newsize); 3282 changed = 1; 3283 } 3284 if (newsize > EXT4_I(inode)->i_disksize) { 3285 ext4_update_i_disksize(inode, newsize); 3286 changed |= 2; 3287 } 3288 return changed; 3289} 3290 3291int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3292 loff_t len); 3293 3294struct ext4_group_info { 3295 unsigned long bb_state; 3296#ifdef AGGRESSIVE_CHECK 3297 unsigned long bb_check_counter; 3298#endif 3299 struct rb_root bb_free_root; 3300 ext4_grpblk_t bb_first_free; /* first free block */ 3301 ext4_grpblk_t bb_free; /* total free blocks */ 3302 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3303 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3304 struct list_head bb_prealloc_list; 3305#ifdef DOUBLE_CHECK 3306 void *bb_bitmap; 3307#endif 3308 struct rw_semaphore alloc_sem; 3309 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3310 * regions, index is order. 3311 * bb_counters[3] = 5 means 3312 * 5 free 8-block regions. */ 3313}; 3314 3315#define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3316#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3317#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3318#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3319#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3320 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3321#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3322 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3323#define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3324 3325#define EXT4_MB_GRP_NEED_INIT(grp) \ 3326 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3327#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3328 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3329#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3330 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3331 3332#define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3333 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3334#define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3335 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3336#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3337 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3338#define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3339 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3340 3341#define EXT4_MAX_CONTENTION 8 3342#define EXT4_CONTENTION_THRESHOLD 2 3343 3344static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3345 ext4_group_t group) 3346{ 3347 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3348} 3349 3350/* 3351 * Returns true if the filesystem is busy enough that attempts to 3352 * access the block group locks has run into contention. 3353 */ 3354static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3355{ 3356 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3357} 3358 3359static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3360{ 3361 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3362 if (spin_trylock(lock)) 3363 /* 3364 * We're able to grab the lock right away, so drop the 3365 * lock contention counter. 3366 */ 3367 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3368 else { 3369 /* 3370 * The lock is busy, so bump the contention counter, 3371 * and then wait on the spin lock. 3372 */ 3373 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3374 EXT4_MAX_CONTENTION); 3375 spin_lock(lock); 3376 } 3377} 3378 3379static inline void ext4_unlock_group(struct super_block *sb, 3380 ext4_group_t group) 3381{ 3382 spin_unlock(ext4_group_lock_ptr(sb, group)); 3383} 3384 3385/* 3386 * Block validity checking 3387 */ 3388#define ext4_check_indirect_blockref(inode, bh) \ 3389 ext4_check_blockref(__func__, __LINE__, inode, \ 3390 (__le32 *)(bh)->b_data, \ 3391 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3392 3393#define ext4_ind_check_inode(inode) \ 3394 ext4_check_blockref(__func__, __LINE__, inode, \ 3395 EXT4_I(inode)->i_data, \ 3396 EXT4_NDIR_BLOCKS) 3397 3398/* 3399 * Inodes and files operations 3400 */ 3401 3402/* dir.c */ 3403extern const struct file_operations ext4_dir_operations; 3404 3405#ifdef CONFIG_UNICODE 3406extern const struct dentry_operations ext4_dentry_ops; 3407#endif 3408 3409/* file.c */ 3410extern const struct inode_operations ext4_file_inode_operations; 3411extern const struct file_operations ext4_file_operations; 3412extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3413 3414/* inline.c */ 3415extern int ext4_get_max_inline_size(struct inode *inode); 3416extern int ext4_find_inline_data_nolock(struct inode *inode); 3417extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3418 unsigned int len); 3419extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3420 3421extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3422extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3423 struct inode *inode, 3424 loff_t pos, unsigned len, 3425 unsigned flags, 3426 struct page **pagep); 3427extern int ext4_write_inline_data_end(struct inode *inode, 3428 loff_t pos, unsigned len, 3429 unsigned copied, 3430 struct page *page); 3431extern struct buffer_head * 3432ext4_journalled_write_inline_data(struct inode *inode, 3433 unsigned len, 3434 struct page *page); 3435extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3436 struct inode *inode, 3437 loff_t pos, unsigned len, 3438 unsigned flags, 3439 struct page **pagep, 3440 void **fsdata); 3441extern int ext4_try_add_inline_entry(handle_t *handle, 3442 struct ext4_filename *fname, 3443 struct inode *dir, struct inode *inode); 3444extern int ext4_try_create_inline_dir(handle_t *handle, 3445 struct inode *parent, 3446 struct inode *inode); 3447extern int ext4_read_inline_dir(struct file *filp, 3448 struct dir_context *ctx, 3449 int *has_inline_data); 3450extern int ext4_inlinedir_to_tree(struct file *dir_file, 3451 struct inode *dir, ext4_lblk_t block, 3452 struct dx_hash_info *hinfo, 3453 __u32 start_hash, __u32 start_minor_hash, 3454 int *has_inline_data); 3455extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3456 struct ext4_filename *fname, 3457 struct ext4_dir_entry_2 **res_dir, 3458 int *has_inline_data); 3459extern int ext4_delete_inline_entry(handle_t *handle, 3460 struct inode *dir, 3461 struct ext4_dir_entry_2 *de_del, 3462 struct buffer_head *bh, 3463 int *has_inline_data); 3464extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3465extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3466 struct ext4_dir_entry_2 **parent_de, 3467 int *retval); 3468extern int ext4_inline_data_fiemap(struct inode *inode, 3469 struct fiemap_extent_info *fieinfo, 3470 int *has_inline, __u64 start, __u64 len); 3471 3472struct iomap; 3473extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3474 3475extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3476 3477extern int ext4_convert_inline_data(struct inode *inode); 3478 3479static inline int ext4_has_inline_data(struct inode *inode) 3480{ 3481 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3482 EXT4_I(inode)->i_inline_off; 3483} 3484 3485/* namei.c */ 3486extern const struct inode_operations ext4_dir_inode_operations; 3487extern const struct inode_operations ext4_special_inode_operations; 3488extern struct dentry *ext4_get_parent(struct dentry *child); 3489extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3490 struct ext4_dir_entry_2 *de, 3491 int blocksize, int csum_size, 3492 unsigned int parent_ino, int dotdot_real_len); 3493extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3494 unsigned int blocksize); 3495extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3496 struct buffer_head *bh); 3497extern int ext4_ci_compare(const struct inode *parent, 3498 const struct qstr *fname, 3499 const struct qstr *entry, bool quick); 3500extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, 3501 struct inode *inode, struct dentry *dentry); 3502extern int __ext4_link(struct inode *dir, struct inode *inode, 3503 struct dentry *dentry); 3504 3505#define S_SHIFT 12 3506static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3507 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3508 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3509 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3510 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3511 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3512 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3513 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3514}; 3515 3516static inline void ext4_set_de_type(struct super_block *sb, 3517 struct ext4_dir_entry_2 *de, 3518 umode_t mode) { 3519 if (ext4_has_feature_filetype(sb)) 3520 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3521} 3522 3523/* readpages.c */ 3524extern int ext4_mpage_readpages(struct inode *inode, 3525 struct readahead_control *rac, struct page *page); 3526extern int __init ext4_init_post_read_processing(void); 3527extern void ext4_exit_post_read_processing(void); 3528 3529/* symlink.c */ 3530extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3531extern const struct inode_operations ext4_symlink_inode_operations; 3532extern const struct inode_operations ext4_fast_symlink_inode_operations; 3533 3534/* sysfs.c */ 3535extern int ext4_register_sysfs(struct super_block *sb); 3536extern void ext4_unregister_sysfs(struct super_block *sb); 3537extern int __init ext4_init_sysfs(void); 3538extern void ext4_exit_sysfs(void); 3539 3540/* block_validity */ 3541extern void ext4_release_system_zone(struct super_block *sb); 3542extern int ext4_setup_system_zone(struct super_block *sb); 3543extern int __init ext4_init_system_zone(void); 3544extern void ext4_exit_system_zone(void); 3545extern int ext4_inode_block_valid(struct inode *inode, 3546 ext4_fsblk_t start_blk, 3547 unsigned int count); 3548extern int ext4_check_blockref(const char *, unsigned int, 3549 struct inode *, __le32 *, unsigned int); 3550extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, 3551 ext4_fsblk_t start_blk, unsigned int count); 3552 3553 3554/* extents.c */ 3555struct ext4_ext_path; 3556struct ext4_extent; 3557 3558/* 3559 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3560 * __le32. 3561 */ 3562#define EXT_MAX_BLOCKS 0xffffffff 3563 3564extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3565extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3566extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3567 struct ext4_map_blocks *map, int flags); 3568extern int ext4_ext_truncate(handle_t *, struct inode *); 3569extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3570 ext4_lblk_t end); 3571extern void ext4_ext_init(struct super_block *); 3572extern void ext4_ext_release(struct super_block *); 3573extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3574 loff_t len); 3575extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3576 loff_t offset, ssize_t len); 3577extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3578 ext4_io_end_t *io_end); 3579extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3580 struct ext4_map_blocks *map, int flags); 3581extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3582 int num, 3583 struct ext4_ext_path *path); 3584extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3585 struct ext4_ext_path **, 3586 struct ext4_extent *, int); 3587extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3588 struct ext4_ext_path **, 3589 int flags); 3590extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3591extern int ext4_ext_check_inode(struct inode *inode); 3592extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3593extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3594 __u64 start, __u64 len); 3595extern int ext4_get_es_cache(struct inode *inode, 3596 struct fiemap_extent_info *fieinfo, 3597 __u64 start, __u64 len); 3598extern int ext4_ext_precache(struct inode *inode); 3599extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3600 struct inode *inode2, ext4_lblk_t lblk1, 3601 ext4_lblk_t lblk2, ext4_lblk_t count, 3602 int mark_unwritten,int *err); 3603extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3604extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3605 int check_cred, int restart_cred, 3606 int revoke_cred); 3607extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3608extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3609extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3610 int len, int unwritten, ext4_fsblk_t pblk); 3611extern int ext4_ext_clear_bb(struct inode *inode); 3612 3613 3614/* move_extent.c */ 3615extern void ext4_double_down_write_data_sem(struct inode *first, 3616 struct inode *second); 3617extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3618 struct inode *donor_inode); 3619extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3620 __u64 start_orig, __u64 start_donor, 3621 __u64 len, __u64 *moved_len); 3622 3623/* page-io.c */ 3624extern int __init ext4_init_pageio(void); 3625extern void ext4_exit_pageio(void); 3626extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3627extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3628extern int ext4_put_io_end(ext4_io_end_t *io_end); 3629extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3630extern void ext4_io_submit_init(struct ext4_io_submit *io, 3631 struct writeback_control *wbc); 3632extern void ext4_end_io_rsv_work(struct work_struct *work); 3633extern void ext4_io_submit(struct ext4_io_submit *io); 3634extern int ext4_bio_write_page(struct ext4_io_submit *io, 3635 struct page *page, 3636 int len, 3637 struct writeback_control *wbc, 3638 bool keep_towrite); 3639extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3640extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3641 3642/* mmp.c */ 3643extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3644 3645/* mmp.c */ 3646extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3647 3648/* verity.c */ 3649extern const struct fsverity_operations ext4_verityops; 3650 3651/* 3652 * Add new method to test whether block and inode bitmaps are properly 3653 * initialized. With uninit_bg reading the block from disk is not enough 3654 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3655 */ 3656#define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3657 3658static inline int bitmap_uptodate(struct buffer_head *bh) 3659{ 3660 return (buffer_uptodate(bh) && 3661 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3662} 3663static inline void set_bitmap_uptodate(struct buffer_head *bh) 3664{ 3665 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3666} 3667 3668#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3669 3670/* For ioend & aio unwritten conversion wait queues */ 3671#define EXT4_WQ_HASH_SZ 37 3672#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3673 EXT4_WQ_HASH_SZ]) 3674extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3675 3676extern int ext4_resize_begin(struct super_block *sb); 3677extern void ext4_resize_end(struct super_block *sb); 3678 3679static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3680 struct ext4_io_end *io_end) 3681{ 3682 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3683 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3684 atomic_inc(&EXT4_I(inode)->i_unwritten); 3685 } 3686} 3687 3688static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3689{ 3690 struct inode *inode = io_end->inode; 3691 3692 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3693 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3694 /* Wake up anyone waiting on unwritten extent conversion */ 3695 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3696 wake_up_all(ext4_ioend_wq(inode)); 3697 } 3698} 3699 3700extern const struct iomap_ops ext4_iomap_ops; 3701extern const struct iomap_ops ext4_iomap_overwrite_ops; 3702extern const struct iomap_ops ext4_iomap_report_ops; 3703 3704static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3705{ 3706 /* 3707 * If the buffer has the write error flag, we have failed 3708 * to write out data in the block. In this case, we don't 3709 * have to read the block because we may read the old data 3710 * successfully. 3711 */ 3712 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3713 set_buffer_uptodate(bh); 3714 return buffer_uptodate(bh); 3715} 3716 3717#endif /* __KERNEL__ */ 3718 3719#define EFSBADCRC EBADMSG /* Bad CRC detected */ 3720#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3721 3722#endif /* _EXT4_H */ 3723