fs/ext4/ext4.h

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