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/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/version.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 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #include <linux/fscrypt.h>
  44 #include <linux/fsverity.h>
  45
  46 #include <linux/compiler.h>
  47
  48 /*
  49  * The fourth extended filesystem constants/structures
  50  */
  51
  52 /*
  53  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  54  * structures. these checks slow things down a lot
  55  */
  56 #define AGGRESSIVE_CHECK__
  57
  58 /*
  59  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  60  * bitmaps, maintains and uses them to check for double allocations
  61  */
  62 #define DOUBLE_CHECK__
  63
  64 /*
  65  * Define EXT4FS_DEBUG to produce debug messages
  66  */
  67 #undef EXT4FS_DEBUG
  68
  69 /*
  70  * Debug code
  71  */
  72 #ifdef EXT4FS_DEBUG
  73 #define ext4_debug(f, a...)                                             \
  74         do {                                                            \
  75                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  76                         __FILE__, __LINE__, __func__);                  \
  77                 printk(KERN_DEBUG f, ## a);                             \
  78         } while (0)
  79 #else
  80 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  81 #endif
  82
  83 /*
  84  * Turn on EXT_DEBUG to get lots of info about extents operations.
  85  */
  86 #define EXT_DEBUG__
  87 #ifdef EXT_DEBUG
  88 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  89 #else
  90 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  91 #endif
  92
  93 /* data type for block offset of block group */
  94 typedef int ext4_grpblk_t;
  95
  96 /* data type for filesystem-wide blocks number */
  97 typedef unsigned long long ext4_fsblk_t;
  98
  99 /* data type for file logical block number */
 100 typedef __u32 ext4_lblk_t;
 101
 102 /* data type for block group number */
 103 typedef unsigned int ext4_group_t;
 104
 105 enum SHIFT_DIRECTION {
 106         SHIFT_LEFT = 0,
 107         SHIFT_RIGHT,
 108 };
 109
 110 /*
 111  * Flags used in mballoc's allocation_context flags field.
 112  *
 113  * Also used to show what's going on for debugging purposes when the
 114  * flag field is exported via the traceport interface
 115  */
 116
 117 /* prefer goal again. length */
 118 #define EXT4_MB_HINT_MERGE              0x0001
 119 /* blocks already reserved */
 120 #define EXT4_MB_HINT_RESERVED           0x0002
 121 /* metadata is being allocated */
 122 #define EXT4_MB_HINT_METADATA           0x0004
 123 /* first blocks in the file */
 124 #define EXT4_MB_HINT_FIRST              0x0008
 125 /* search for the best chunk */
 126 #define EXT4_MB_HINT_BEST               0x0010
 127 /* data is being allocated */
 128 #define EXT4_MB_HINT_DATA               0x0020
 129 /* don't preallocate (for tails) */
 130 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 131 /* allocate for locality group */
 132 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 133 /* allocate goal blocks or none */
 134 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 135 /* goal is meaningful */
 136 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 137 /* blocks already pre-reserved by delayed allocation */
 138 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 139 /* We are doing stream allocation */
 140 #define EXT4_MB_STREAM_ALLOC            0x0800
 141 /* Use reserved root blocks if needed */
 142 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 143 /* Use blocks from reserved pool */
 144 #define EXT4_MB_USE_RESERVED            0x2000
 145
 146 struct ext4_allocation_request {
 147         /* target inode for block we're allocating */
 148         struct inode *inode;
 149         /* how many blocks we want to allocate */
 150         unsigned int len;
 151         /* logical block in target inode */
 152         ext4_lblk_t logical;
 153         /* the closest logical allocated block to the left */
 154         ext4_lblk_t lleft;
 155         /* the closest logical allocated block to the right */
 156         ext4_lblk_t lright;
 157         /* phys. target (a hint) */
 158         ext4_fsblk_t goal;
 159         /* phys. block for the closest logical allocated block to the left */
 160         ext4_fsblk_t pleft;
 161         /* phys. block for the closest logical allocated block to the right */
 162         ext4_fsblk_t pright;
 163         /* flags. see above EXT4_MB_HINT_* */
 164         unsigned int flags;
 165 };
 166
 167 /*
 168  * Logical to physical block mapping, used by ext4_map_blocks()
 169  *
 170  * This structure is used to pass requests into ext4_map_blocks() as
 171  * well as to store the information returned by ext4_map_blocks().  It
 172  * takes less room on the stack than a struct buffer_head.
 173  */
 174 #define EXT4_MAP_NEW            (1 << BH_New)
 175 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 176 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 177 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 178 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 179                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 180
 181 struct ext4_map_blocks {
 182         ext4_fsblk_t m_pblk;
 183         ext4_lblk_t m_lblk;
 184         unsigned int m_len;
 185         unsigned int m_flags;
 186 };
 187
 188 /*
 189  * Block validity checking, system zone rbtree.
 190  */
 191 struct ext4_system_blocks {
 192         struct rb_root root;
 193         struct rcu_head rcu;
 194 };
 195
 196 /*
 197  * Flags for ext4_io_end->flags
 198  */
 199 #define EXT4_IO_END_UNWRITTEN   0x0001
 200
 201 struct ext4_io_end_vec {
 202         struct list_head list;          /* list of io_end_vec */
 203         loff_t offset;                  /* offset in the file */
 204         ssize_t size;                   /* size of the extent */
 205 };
 206
 207 /*
 208  * For converting unwritten extents on a work queue. 'handle' is used for
 209  * buffered writeback.
 210  */
 211 typedef struct ext4_io_end {
 212         struct list_head        list;           /* per-file finished IO list */
 213         handle_t                *handle;        /* handle reserved for extent
 214                                                  * conversion */
 215         struct inode            *inode;         /* file being written to */
 216         struct bio              *bio;           /* Linked list of completed
 217                                                  * bios covering the extent */
 218         unsigned int            flag;           /* unwritten or not */
 219         atomic_t                count;          /* reference counter */
 220         struct list_head        list_vec;       /* list of ext4_io_end_vec */
 221 } ext4_io_end_t;
 222
 223 struct ext4_io_submit {
 224         struct writeback_control *io_wbc;
 225         struct bio              *io_bio;
 226         ext4_io_end_t           *io_end;
 227         sector_t                io_next_block;
 228 };
 229
 230 /*
 231  * Special inodes numbers
 232  */
 233 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 234 #define EXT4_ROOT_INO            2      /* Root inode */
 235 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 236 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 237 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 238 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 239 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 240 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 241
 242 /* First non-reserved inode for old ext4 filesystems */
 243 #define EXT4_GOOD_OLD_FIRST_INO 11
 244
 245 /*
 246  * Maximal count of links to a file
 247  */
 248 #define EXT4_LINK_MAX           65000
 249
 250 /*
 251  * Macro-instructions used to manage several block sizes
 252  */
 253 #define EXT4_MIN_BLOCK_SIZE             1024
 254 #define EXT4_MAX_BLOCK_SIZE             65536
 255 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 256 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 257 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 258 #ifdef __KERNEL__
 259 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 260 #else
 261 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 262 #endif
 263 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 264 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 265                                          EXT4_SB(s)->s_cluster_bits)
 266 #ifdef __KERNEL__
 267 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 268 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 269 #else
 270 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 271 #endif
 272 #ifdef __KERNEL__
 273 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 274 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 275 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 276 #else
 277 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 278                                  EXT4_GOOD_OLD_INODE_SIZE : \
 279                                  (s)->s_inode_size)
 280 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 281                                  EXT4_GOOD_OLD_FIRST_INO : \
 282                                  (s)->s_first_ino)
 283 #endif
 284 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 285 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 286         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 287                                                                   blkbits))
 288
 289 /* Translate a block number to a cluster number */
 290 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 291 /* Translate a cluster number to a block number */
 292 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 293 /* Translate # of blks to # of clusters */
 294 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 295                                  (sbi)->s_cluster_bits)
 296 /* Mask out the low bits to get the starting block of the cluster */
 297 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 298                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 299 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 300                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 301 /* Fill in the low bits to get the last block of the cluster */
 302 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 303                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 304 /* Get the cluster offset */
 305 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 306                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 307 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 308                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 309
 310 /*
 311  * Structure of a blocks group descriptor
 312  */
 313 struct ext4_group_desc
 314 {
 315         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 316         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 317         __le32  bg_inode_table_lo;      /* Inodes table block */
 318         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 319         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 320         __le16  bg_used_dirs_count_lo;  /* Directories count */
 321         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 322         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 323         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 324         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 325         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 326         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 327         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 328         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 329         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 330         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 331         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 332         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 333         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 334         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 335         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 336         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 337         __u32   bg_reserved;
 338 };
 339
 340 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 341         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 342          sizeof(__le16))
 343 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 344         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 345          sizeof(__le16))
 346
 347 /*
 348  * Structure of a flex block group info
 349  */
 350
 351 struct flex_groups {
 352         atomic64_t      free_clusters;
 353         atomic_t        free_inodes;
 354         atomic_t        used_dirs;
 355 };
 356
 357 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 358 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 359 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 360
 361 /*
 362  * Macro-instructions used to manage group descriptors
 363  */
 364 #define EXT4_MIN_DESC_SIZE              32
 365 #define EXT4_MIN_DESC_SIZE_64BIT        64
 366 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 367 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 368 #ifdef __KERNEL__
 369 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 370 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 371 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 372 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 373 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 374 #else
 375 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 376 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 377 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 378 #endif
 379
 380 /*
 381  * Constants relative to the data blocks
 382  */
 383 #define EXT4_NDIR_BLOCKS                12
 384 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 385 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 386 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 387 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 388
 389 /*
 390  * Inode flags
 391  */
 392 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 393 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 394 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 395 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 396 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 397 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 398 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 399 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 400 /* Reserved for compression usage... */
 401 #define EXT4_DIRTY_FL                   0x00000100
 402 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 403 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 404         /* nb: was previously EXT2_ECOMPR_FL */
 405 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 406 /* End compression flags --- maybe not all used */
 407 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 408 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 409 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 410 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 411 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 412 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 413 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 414 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 415 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 416 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 417 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 418 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 419 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 420 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded file */
 421 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 422
 423 #define EXT4_FL_USER_VISIBLE            0x705BDFFF /* User visible flags */
 424 #define EXT4_FL_USER_MODIFIABLE         0x604BC0FF /* User modifiable flags */
 425
 426 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 427 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 428                                          EXT4_IMMUTABLE_FL | \
 429                                          EXT4_APPEND_FL | \
 430                                          EXT4_NODUMP_FL | \
 431                                          EXT4_NOATIME_FL | \
 432                                          EXT4_PROJINHERIT_FL)
 433
 434 /* Flags that should be inherited by new inodes from their parent. */
 435 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 436                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 437                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 438                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 439                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
 440
 441 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 442 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 443                            EXT4_PROJINHERIT_FL))
 444
 445 /* Flags that are appropriate for non-directories/regular files. */
 446 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 447
 448 /* The only flags that should be swapped */
 449 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 450
 451 /* Mask out flags that are inappropriate for the given type of inode. */
 452 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 453 {
 454         if (S_ISDIR(mode))
 455                 return flags;
 456         else if (S_ISREG(mode))
 457                 return flags & EXT4_REG_FLMASK;
 458         else
 459                 return flags & EXT4_OTHER_FLMASK;
 460 }
 461
 462 /*
 463  * Inode flags used for atomic set/get
 464  */
 465 enum {
 466         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 467         EXT4_INODE_UNRM         = 1,    /* Undelete */
 468         EXT4_INODE_COMPR        = 2,    /* Compress file */
 469         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 470         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 471         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 472         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 473         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 474 /* Reserved for compression usage... */
 475         EXT4_INODE_DIRTY        = 8,
 476         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 477         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 478         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 479 /* End compression flags --- maybe not all used */
 480         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 481         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 482         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 483         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 484         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 485         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 486         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 487         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 488         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 489         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 490         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 491         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 492         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 493         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 494 };
 495
 496 /*
 497  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 498  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 499  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 500  * any extra space in the compiled kernel image, otherwise, the build will fail.
 501  * It's important that these values are the same, since we are using
 502  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 503  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 504  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 505  * defined in e2fsprogs.
 506  *
 507  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 508  */
 509 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 510 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 511
 512 static inline void ext4_check_flag_values(void)
 513 {
 514         CHECK_FLAG_VALUE(SECRM);
 515         CHECK_FLAG_VALUE(UNRM);
 516         CHECK_FLAG_VALUE(COMPR);
 517         CHECK_FLAG_VALUE(SYNC);
 518         CHECK_FLAG_VALUE(IMMUTABLE);
 519         CHECK_FLAG_VALUE(APPEND);
 520         CHECK_FLAG_VALUE(NODUMP);
 521         CHECK_FLAG_VALUE(NOATIME);
 522         CHECK_FLAG_VALUE(DIRTY);
 523         CHECK_FLAG_VALUE(COMPRBLK);
 524         CHECK_FLAG_VALUE(NOCOMPR);
 525         CHECK_FLAG_VALUE(ENCRYPT);
 526         CHECK_FLAG_VALUE(INDEX);
 527         CHECK_FLAG_VALUE(IMAGIC);
 528         CHECK_FLAG_VALUE(JOURNAL_DATA);
 529         CHECK_FLAG_VALUE(NOTAIL);
 530         CHECK_FLAG_VALUE(DIRSYNC);
 531         CHECK_FLAG_VALUE(TOPDIR);
 532         CHECK_FLAG_VALUE(HUGE_FILE);
 533         CHECK_FLAG_VALUE(EXTENTS);
 534         CHECK_FLAG_VALUE(VERITY);
 535         CHECK_FLAG_VALUE(EA_INODE);
 536         CHECK_FLAG_VALUE(EOFBLOCKS);
 537         CHECK_FLAG_VALUE(INLINE_DATA);
 538         CHECK_FLAG_VALUE(PROJINHERIT);
 539         CHECK_FLAG_VALUE(RESERVED);
 540 }
 541
 542 /* Used to pass group descriptor data when online resize is done */
 543 struct ext4_new_group_input {
 544         __u32 group;            /* Group number for this data */
 545         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 546         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 547         __u64 inode_table;      /* Absolute block number of inode table start */
 548         __u32 blocks_count;     /* Total number of blocks in this group */
 549         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 550         __u16 unused;
 551 };
 552
 553 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 554 struct compat_ext4_new_group_input {
 555         u32 group;
 556         compat_u64 block_bitmap;
 557         compat_u64 inode_bitmap;
 558         compat_u64 inode_table;
 559         u32 blocks_count;
 560         u16 reserved_blocks;
 561         u16 unused;
 562 };
 563 #endif
 564
 565 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 566 struct ext4_new_group_data {
 567         __u32 group;
 568         __u64 block_bitmap;
 569         __u64 inode_bitmap;
 570         __u64 inode_table;
 571         __u32 blocks_count;
 572         __u16 reserved_blocks;
 573         __u16 mdata_blocks;
 574         __u32 free_clusters_count;
 575 };
 576
 577 /* Indexes used to index group tables in ext4_new_group_data */
 578 enum {
 579         BLOCK_BITMAP = 0,       /* block bitmap */
 580         INODE_BITMAP,           /* inode bitmap */
 581         INODE_TABLE,            /* inode tables */
 582         GROUP_TABLE_COUNT,
 583 };
 584
 585 /*
 586  * Flags used by ext4_map_blocks()
 587  */
 588         /* Allocate any needed blocks and/or convert an unwritten
 589            extent to be an initialized ext4 */
 590 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 591         /* Request the creation of an unwritten extent */
 592 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 593 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 594                                                  EXT4_GET_BLOCKS_CREATE)
 595         /* Caller is from the delayed allocation writeout path
 596          * finally doing the actual allocation of delayed blocks */
 597 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 598         /* caller is from the direct IO path, request to creation of an
 599         unwritten extents if not allocated, split the unwritten
 600         extent if blocks has been preallocated already*/
 601 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 602 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 603 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 604                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 605         /* Convert extent to initialized after IO complete */
 606 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 607                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 608         /* Eventual metadata allocation (due to growing extent tree)
 609          * should not fail, so try to use reserved blocks for that.*/
 610 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 611         /* Don't normalize allocation size (used for fallocate) */
 612 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 613         /* Request will not result in inode size update (user for fallocate) */
 614 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 615         /* Convert written extents to unwritten */
 616 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 617         /* Write zeros to newly created written extents */
 618 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 619 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 620                                         EXT4_GET_BLOCKS_ZERO)
 621         /* Caller will submit data before dropping transaction handle. This
 622          * allows jbd2 to avoid submitting data before commit. */
 623 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 624
 625 /*
 626  * The bit position of these flags must not overlap with any of the
 627  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 628  * read_extent_tree_block(), ext4_split_extent_at(),
 629  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 630  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 631  * caching the extents when reading from the extent tree while a
 632  * truncate or punch hole operation is in progress.
 633  */
 634 #define EXT4_EX_NOCACHE                         0x40000000
 635 #define EXT4_EX_FORCE_CACHE                     0x20000000
 636
 637 /*
 638  * Flags used by ext4_free_blocks
 639  */
 640 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 641 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 642 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 643 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 644 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 645 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 646 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 647
 648 /*
 649  * ioctl commands
 650  */
 651 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 652 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 653 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 654 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 655 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 656 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 657 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 658 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 659 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 660 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 661 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 662  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 663  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 664 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 665 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 666 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 667 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 668 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 669 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 670 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 671 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 672 /* ioctl codes 19--39 are reserved for fscrypt */
 673 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 674 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 675 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 676
 677 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 678 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 679
 680 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 681
 682 /*
 683  * Flags for going down operation
 684  */
 685 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 686 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 687 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 688
 689 /*
 690  * Flags returned by EXT4_IOC_GETSTATE
 691  *
 692  * We only expose to userspace a subset of the state flags in
 693  * i_state_flags
 694  */
 695 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 696 #define EXT4_STATE_FLAG_NEW             0x00000002
 697 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 698 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 699
 700 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 701 /*
 702  * ioctl commands in 32 bit emulation
 703  */
 704 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 705 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 706 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 707 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 708 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 709 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 710 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 711 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 712 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 713 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 714 #endif
 715
 716 /*
 717  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 718  * It indicates that the entry in extent status cache is for a hole.
 719  */
 720 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 721
 722 /* Max physical block we can address w/o extents */
 723 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 724
 725 /* Max logical block we can support */
 726 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 727
 728 /*
 729  * Structure of an inode on the disk
 730  */
 731 struct ext4_inode {
 732         __le16  i_mode;         /* File mode */
 733         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 734         __le32  i_size_lo;      /* Size in bytes */
 735         __le32  i_atime;        /* Access time */
 736         __le32  i_ctime;        /* Inode Change time */
 737         __le32  i_mtime;        /* Modification time */
 738         __le32  i_dtime;        /* Deletion Time */
 739         __le16  i_gid;          /* Low 16 bits of Group Id */
 740         __le16  i_links_count;  /* Links count */
 741         __le32  i_blocks_lo;    /* Blocks count */
 742         __le32  i_flags;        /* File flags */
 743         union {
 744                 struct {
 745                         __le32  l_i_version;
 746                 } linux1;
 747                 struct {
 748                         __u32  h_i_translator;
 749                 } hurd1;
 750                 struct {
 751                         __u32  m_i_reserved1;
 752                 } masix1;
 753         } osd1;                         /* OS dependent 1 */
 754         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 755         __le32  i_generation;   /* File version (for NFS) */
 756         __le32  i_file_acl_lo;  /* File ACL */
 757         __le32  i_size_high;
 758         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 759         union {
 760                 struct {
 761                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 762                         __le16  l_i_file_acl_high;
 763                         __le16  l_i_uid_high;   /* these 2 fields */
 764                         __le16  l_i_gid_high;   /* were reserved2[0] */
 765                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 766                         __le16  l_i_reserved;
 767                 } linux2;
 768                 struct {
 769                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 770                         __u16   h_i_mode_high;
 771                         __u16   h_i_uid_high;
 772                         __u16   h_i_gid_high;
 773                         __u32   h_i_author;
 774                 } hurd2;
 775                 struct {
 776                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 777                         __le16  m_i_file_acl_high;
 778                         __u32   m_i_reserved2[2];
 779                 } masix2;
 780         } osd2;                         /* OS dependent 2 */
 781         __le16  i_extra_isize;
 782         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 783         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 784         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 785         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 786         __le32  i_crtime;       /* File Creation time */
 787         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 788         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 789         __le32  i_projid;       /* Project ID */
 790 };
 791
 792 struct move_extent {
 793         __u32 reserved;         /* should be zero */
 794         __u32 donor_fd;         /* donor file descriptor */
 795         __u64 orig_start;       /* logical start offset in block for orig */
 796         __u64 donor_start;      /* logical start offset in block for donor */
 797         __u64 len;              /* block length to be moved */
 798         __u64 moved_len;        /* moved block length */
 799 };
 800
 801 #define EXT4_EPOCH_BITS 2
 802 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 803 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 804
 805 /*
 806  * Extended fields will fit into an inode if the filesystem was formatted
 807  * with large inodes (-I 256 or larger) and there are not currently any EAs
 808  * consuming all of the available space. For new inodes we always reserve
 809  * enough space for the kernel's known extended fields, but for inodes
 810  * created with an old kernel this might not have been the case. None of
 811  * the extended inode fields is critical for correct filesystem operation.
 812  * This macro checks if a certain field fits in the inode. Note that
 813  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 814  */
 815 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 816         ((offsetof(typeof(*ext4_inode), field) +        \
 817           sizeof((ext4_inode)->field))                  \
 818         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 819             (einode)->i_extra_isize))                   \
 820
 821 /*
 822  * We use an encoding that preserves the times for extra epoch "00":
 823  *
 824  * extra  msb of                         adjust for signed
 825  * epoch  32-bit                         32-bit tv_sec to
 826  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 827  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 828  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 829  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 830  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 831  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 832  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 833  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 834  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 835  *
 836  * Note that previous versions of the kernel on 64-bit systems would
 837  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 838  * 1970.  e2fsck will correct this, assuming that it is run on the
 839  * affected filesystem before 2242.
 840  */
 841
 842 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 843 {
 844         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 845         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 846 }
 847
 848 static inline void ext4_decode_extra_time(struct timespec64 *time,
 849                                           __le32 extra)
 850 {
 851         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 852                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 853         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 854 }
 855
 856 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 857 do {                                                                            \
 858         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 859                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 860                 (raw_inode)->xtime ## _extra =                                  \
 861                                 ext4_encode_extra_time(&(inode)->xtime);        \
 862                 }                                                               \
 863         else    \
 864                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 865 } while (0)
 866
 867 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 868 do {                                                                           \
 869         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 870                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 871         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 872                 (raw_inode)->xtime ## _extra =                                 \
 873                                 ext4_encode_extra_time(&(einode)->xtime);      \
 874 } while (0)
 875
 876 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 877 do {                                                                            \
 878         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 879         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 880                 ext4_decode_extra_time(&(inode)->xtime,                         \
 881                                        raw_inode->xtime ## _extra);             \
 882                 }                                                               \
 883         else                                                                    \
 884                 (inode)->xtime.tv_nsec = 0;                                     \
 885 } while (0)
 886
 887
 888 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 889 do {                                                                           \
 890         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 891                 (einode)->xtime.tv_sec =                                       \
 892                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 893         else                                                                   \
 894                 (einode)->xtime.tv_sec = 0;                                    \
 895         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 896                 ext4_decode_extra_time(&(einode)->xtime,                       \
 897                                        raw_inode->xtime ## _extra);            \
 898         else                                                                   \
 899                 (einode)->xtime.tv_nsec = 0;                                   \
 900 } while (0)
 901
 902 #define i_disk_version osd1.linux1.l_i_version
 903
 904 #if defined(__KERNEL__) || defined(__linux__)
 905 #define i_reserved1     osd1.linux1.l_i_reserved1
 906 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 907 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 908 #define i_uid_low       i_uid
 909 #define i_gid_low       i_gid
 910 #define i_uid_high      osd2.linux2.l_i_uid_high
 911 #define i_gid_high      osd2.linux2.l_i_gid_high
 912 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 913
 914 #elif defined(__GNU__)
 915
 916 #define i_translator    osd1.hurd1.h_i_translator
 917 #define i_uid_high      osd2.hurd2.h_i_uid_high
 918 #define i_gid_high      osd2.hurd2.h_i_gid_high
 919 #define i_author        osd2.hurd2.h_i_author
 920
 921 #elif defined(__masix__)
 922
 923 #define i_reserved1     osd1.masix1.m_i_reserved1
 924 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 925 #define i_reserved2     osd2.masix2.m_i_reserved2
 926
 927 #endif /* defined(__KERNEL__) || defined(__linux__) */
 928
 929 #include "extents_status.h"
 930
 931 /*
 932  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 933  *
 934  * These are needed to avoid lockdep false positives when we need to
 935  * allocate blocks to the quota inode during ext4_map_blocks(), while
 936  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 937  * do quota tracking for the quota inode, this avoids deadlock (as
 938  * well as infinite recursion, since it isn't turtles all the way
 939  * down...)
 940  *
 941  *  I_DATA_SEM_NORMAL - Used for most inodes
 942  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 943  *                        where the second inode has larger inode number
 944  *                        than the first
 945  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 946  */
 947 enum {
 948         I_DATA_SEM_NORMAL = 0,
 949         I_DATA_SEM_OTHER,
 950         I_DATA_SEM_QUOTA,
 951 };
 952
 953
 954 /*
 955  * fourth extended file system inode data in memory
 956  */
 957 struct ext4_inode_info {
 958         __le32  i_data[15];     /* unconverted */
 959         __u32   i_dtime;
 960         ext4_fsblk_t    i_file_acl;
 961
 962         /*
 963          * i_block_group is the number of the block group which contains
 964          * this file's inode.  Constant across the lifetime of the inode,
 965          * it is used for making block allocation decisions - we try to
 966          * place a file's data blocks near its inode block, and new inodes
 967          * near to their parent directory's inode.
 968          */
 969         ext4_group_t    i_block_group;
 970         ext4_lblk_t     i_dir_start_lookup;
 971 #if (BITS_PER_LONG < 64)
 972         unsigned long   i_state_flags;          /* Dynamic state flags */
 973 #endif
 974         unsigned long   i_flags;
 975
 976         /*
 977          * Extended attributes can be read independently of the main file
 978          * data. Taking i_mutex even when reading would cause contention
 979          * between readers of EAs and writers of regular file data, so
 980          * instead we synchronize on xattr_sem when reading or changing
 981          * EAs.
 982          */
 983         struct rw_semaphore xattr_sem;
 984
 985         struct list_head i_orphan;      /* unlinked but open inodes */
 986
 987         /*
 988          * i_disksize keeps track of what the inode size is ON DISK, not
 989          * in memory.  During truncate, i_size is set to the new size by
 990          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 991          * set i_disksize to 0 until the truncate is actually under way.
 992          *
 993          * The intent is that i_disksize always represents the blocks which
 994          * are used by this file.  This allows recovery to restart truncate
 995          * on orphans if we crash during truncate.  We actually write i_disksize
 996          * into the on-disk inode when writing inodes out, instead of i_size.
 997          *
 998          * The only time when i_disksize and i_size may be different is when
 999          * a truncate is in progress.  The only things which change i_disksize
1000          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1001          */
1002         loff_t  i_disksize;
1003
1004         /*
1005          * i_data_sem is for serialising ext4_truncate() against
1006          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1007          * data tree are chopped off during truncate. We can't do that in
1008          * ext4 because whenever we perform intermediate commits during
1009          * truncate, the inode and all the metadata blocks *must* be in a
1010          * consistent state which allows truncation of the orphans to restart
1011          * during recovery.  Hence we must fix the get_block-vs-truncate race
1012          * by other means, so we have i_data_sem.
1013          */
1014         struct rw_semaphore i_data_sem;
1015         /*
1016          * i_mmap_sem is for serializing page faults with truncate / punch hole
1017          * operations. We have to make sure that new page cannot be faulted in
1018          * a section of the inode that is being punched. We cannot easily use
1019          * i_data_sem for this since we need protection for the whole punch
1020          * operation and i_data_sem ranks below transaction start so we have
1021          * to occasionally drop it.
1022          */
1023         struct rw_semaphore i_mmap_sem;
1024         struct inode vfs_inode;
1025         struct jbd2_inode *jinode;
1026
1027         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1028
1029         /*
1030          * File creation time. Its function is same as that of
1031          * struct timespec64 i_{a,c,m}time in the generic inode.
1032          */
1033         struct timespec64 i_crtime;
1034
1035         /* mballoc */
1036         struct list_head i_prealloc_list;
1037         spinlock_t i_prealloc_lock;
1038
1039         /* extents status tree */
1040         struct ext4_es_tree i_es_tree;
1041         rwlock_t i_es_lock;
1042         struct list_head i_es_list;
1043         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1044         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1045         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1046                                            extents to shrink. Protected by
1047                                            i_es_lock  */
1048
1049         /* ialloc */
1050         ext4_group_t    i_last_alloc_group;
1051
1052         /* allocation reservation info for delalloc */
1053         /* In case of bigalloc, this refer to clusters rather than blocks */
1054         unsigned int i_reserved_data_blocks;
1055         ext4_lblk_t i_da_metadata_calc_last_lblock;
1056         int i_da_metadata_calc_len;
1057
1058         /* pending cluster reservations for bigalloc file systems */
1059         struct ext4_pending_tree i_pending_tree;
1060
1061         /* on-disk additional length */
1062         __u16 i_extra_isize;
1063
1064         /* Indicate the inline data space. */
1065         u16 i_inline_off;
1066         u16 i_inline_size;
1067
1068 #ifdef CONFIG_QUOTA
1069         /* quota space reservation, managed internally by quota code */
1070         qsize_t i_reserved_quota;
1071 #endif
1072
1073         /* Lock protecting lists below */
1074         spinlock_t i_completed_io_lock;
1075         /*
1076          * Completed IOs that need unwritten extents handling and have
1077          * transaction reserved
1078          */
1079         struct list_head i_rsv_conversion_list;
1080         struct work_struct i_rsv_conversion_work;
1081         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1082
1083         spinlock_t i_block_reservation_lock;
1084
1085         /*
1086          * Transactions that contain inode's metadata needed to complete
1087          * fsync and fdatasync, respectively.
1088          */
1089         tid_t i_sync_tid;
1090         tid_t i_datasync_tid;
1091
1092 #ifdef CONFIG_QUOTA
1093         struct dquot *i_dquot[MAXQUOTAS];
1094 #endif
1095
1096         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1097         __u32 i_csum_seed;
1098
1099         kprojid_t i_projid;
1100 };
1101
1102 /*
1103  * File system states
1104  */
1105 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1106 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1107 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1108
1109 /*
1110  * Misc. filesystem flags
1111  */
1112 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1113 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1114 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1115
1116 /*
1117  * Mount flags set via mount options or defaults
1118  */
1119 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1120 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1121 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1122 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1123 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1124 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1125 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1126 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1127 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1128 #ifdef CONFIG_FS_DAX
1129 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1130 #else
1131 #define EXT4_MOUNT_DAX                  0
1132 #endif
1133 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1134 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1135 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1136 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1137 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1138 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1139 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1140 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1141 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1142 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1143 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1144 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1145                                                  * enable enforcement for hidden
1146                                                  * quota files */
1147 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1148                                                   * enforcement for hidden quota
1149                                                   * files */
1150 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1151                                                   * enforcement */
1152 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1153 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1154 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1155 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1156 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1157 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1158 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1159 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1160 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1161
1162 /*
1163  * Mount flags set either automatically (could not be set by mount option)
1164  * based on per file system feature or property or in special cases such as
1165  * distinguishing between explicit mount option definition and default.
1166  */
1167 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1168                                                       specified delalloc */
1169 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1170                                                       size of blocksize * 8
1171                                                       blocks */
1172 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1173                                                       file systems */
1174
1175 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1176                                                 specified journal checksum */
1177
1178 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1179                                                 ~EXT4_MOUNT_##opt
1180 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1181                                                 EXT4_MOUNT_##opt
1182 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1183                                          EXT4_MOUNT_##opt)
1184
1185 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1186                                                 ~EXT4_MOUNT2_##opt
1187 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1188                                                 EXT4_MOUNT2_##opt
1189 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1190                                          EXT4_MOUNT2_##opt)
1191
1192 #define ext4_test_and_set_bit           __test_and_set_bit_le
1193 #define ext4_set_bit                    __set_bit_le
1194 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1195 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1196 #define ext4_clear_bit                  __clear_bit_le
1197 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1198 #define ext4_test_bit                   test_bit_le
1199 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1200 #define ext4_find_next_bit              find_next_bit_le
1201
1202 extern void ext4_set_bits(void *bm, int cur, int len);
1203
1204 /*
1205  * Maximal mount counts between two filesystem checks
1206  */
1207 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1208 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1209
1210 /*
1211  * Behaviour when detecting errors
1212  */
1213 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1214 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1215 #define EXT4_ERRORS_PANIC               3       /* Panic */
1216 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1217
1218 /* Metadata checksum algorithm codes */
1219 #define EXT4_CRC32C_CHKSUM              1
1220
1221 /*
1222  * Structure of the super block
1223  */
1224 struct ext4_super_block {
1225 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1226         __le32  s_blocks_count_lo;      /* Blocks count */
1227         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1228         __le32  s_free_blocks_count_lo; /* Free blocks count */
1229 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1230         __le32  s_first_data_block;     /* First Data Block */
1231         __le32  s_log_block_size;       /* Block size */
1232         __le32  s_log_cluster_size;     /* Allocation cluster size */
1233 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1234         __le32  s_clusters_per_group;   /* # Clusters per group */
1235         __le32  s_inodes_per_group;     /* # Inodes per group */
1236         __le32  s_mtime;                /* Mount time */
1237 /*30*/  __le32  s_wtime;                /* Write time */
1238         __le16  s_mnt_count;            /* Mount count */
1239         __le16  s_max_mnt_count;        /* Maximal mount count */
1240         __le16  s_magic;                /* Magic signature */
1241         __le16  s_state;                /* File system state */
1242         __le16  s_errors;               /* Behaviour when detecting errors */
1243         __le16  s_minor_rev_level;      /* minor revision level */
1244 /*40*/  __le32  s_lastcheck;            /* time of last check */
1245         __le32  s_checkinterval;        /* max. time between checks */
1246         __le32  s_creator_os;           /* OS */
1247         __le32  s_rev_level;            /* Revision level */
1248 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1249         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1250         /*
1251          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1252          *
1253          * Note: the difference between the compatible feature set and
1254          * the incompatible feature set is that if there is a bit set
1255          * in the incompatible feature set that the kernel doesn't
1256          * know about, it should refuse to mount the filesystem.
1257          *
1258          * e2fsck's requirements are more strict; if it doesn't know
1259          * about a feature in either the compatible or incompatible
1260          * feature set, it must abort and not try to meddle with
1261          * things it doesn't understand...
1262          */
1263         __le32  s_first_ino;            /* First non-reserved inode */
1264         __le16  s_inode_size;           /* size of inode structure */
1265         __le16  s_block_group_nr;       /* block group # of this superblock */
1266         __le32  s_feature_compat;       /* compatible feature set */
1267 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1268         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1269 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1270 /*78*/  char    s_volume_name[16];      /* volume name */
1271 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1272 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1273         /*
1274          * Performance hints.  Directory preallocation should only
1275          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1276          */
1277         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1278         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1279         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1280         /*
1281          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1282          */
1283 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1284 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1285         __le32  s_journal_dev;          /* device number of journal file */
1286         __le32  s_last_orphan;          /* start of list of inodes to delete */
1287         __le32  s_hash_seed[4];         /* HTREE hash seed */
1288         __u8    s_def_hash_version;     /* Default hash version to use */
1289         __u8    s_jnl_backup_type;
1290         __le16  s_desc_size;            /* size of group descriptor */
1291 /*100*/ __le32  s_default_mount_opts;
1292         __le32  s_first_meta_bg;        /* First metablock block group */
1293         __le32  s_mkfs_time;            /* When the filesystem was created */
1294         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1295         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1296 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1297         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1298         __le32  s_free_blocks_count_hi; /* Free blocks count */
1299         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1300         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1301         __le32  s_flags;                /* Miscellaneous flags */
1302         __le16  s_raid_stride;          /* RAID stride */
1303         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1304         __le64  s_mmp_block;            /* Block for multi-mount protection */
1305         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1306         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1307         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1308         __u8    s_encryption_level;     /* versioning level for encryption */
1309         __u8    s_reserved_pad;         /* Padding to next 32bits */
1310         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1311         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1312         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1313         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1314                                               snapshot's future use */
1315         __le32  s_snapshot_list;        /* inode number of the head of the
1316                                            on-disk snapshot list */
1317 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1318         __le32  s_error_count;          /* number of fs errors */
1319         __le32  s_first_error_time;     /* first time an error happened */
1320         __le32  s_first_error_ino;      /* inode involved in first error */
1321         __le64  s_first_error_block;    /* block involved of first error */
1322         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1323         __le32  s_first_error_line;     /* line number where error happened */
1324         __le32  s_last_error_time;      /* most recent time of an error */
1325         __le32  s_last_error_ino;       /* inode involved in last error */
1326         __le32  s_last_error_line;      /* line number where error happened */
1327         __le64  s_last_error_block;     /* block involved of last error */
1328         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1329 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1330         __u8    s_mount_opts[64];
1331         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1332         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1333         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1334         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1335         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1336         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1337         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1338         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1339         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1340         __u8    s_wtime_hi;
1341         __u8    s_mtime_hi;
1342         __u8    s_mkfs_time_hi;
1343         __u8    s_lastcheck_hi;
1344         __u8    s_first_error_time_hi;
1345         __u8    s_last_error_time_hi;
1346         __u8    s_pad[2];
1347         __le16  s_encoding;             /* Filename charset encoding */
1348         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1349         __le32  s_reserved[95];         /* Padding to the end of the block */
1350         __le32  s_checksum;             /* crc32c(superblock) */
1351 };
1352
1353 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1354
1355 #ifdef __KERNEL__
1356
1357 /*
1358  * run-time mount flags
1359  */
1360 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1361 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1362 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1363
1364 #ifdef CONFIG_FS_ENCRYPTION
1365 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1366                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1367 #else
1368 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1369 #endif
1370
1371 /* Number of quota types we support */
1372 #define EXT4_MAXQUOTAS 3
1373
1374 #define EXT4_ENC_UTF8_12_1      1
1375
1376 /*
1377  * Flags for ext4_sb_info.s_encoding_flags.
1378  */
1379 #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1380
1381 #define ext4_has_strict_mode(sbi) \
1382         (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1383
1384 /*
1385  * fourth extended-fs super-block data in memory
1386  */
1387 struct ext4_sb_info {
1388         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1389         unsigned long s_inodes_per_block;/* Number of inodes per block */
1390         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1391         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1392         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1393         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1394         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1395         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1396         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1397         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1398         unsigned long s_overhead;  /* # of fs overhead clusters */
1399         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1400         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1401         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1402         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1403         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1404         struct buffer_head **s_group_desc;
1405         unsigned int s_mount_opt;
1406         unsigned int s_mount_opt2;
1407         unsigned int s_mount_flags;
1408         unsigned int s_def_mount_opt;
1409         ext4_fsblk_t s_sb_block;
1410         atomic64_t s_resv_clusters;
1411         kuid_t s_resuid;
1412         kgid_t s_resgid;
1413         unsigned short s_mount_state;
1414         unsigned short s_pad;
1415         int s_addr_per_block_bits;
1416         int s_desc_per_block_bits;
1417         int s_inode_size;
1418         int s_first_ino;
1419         unsigned int s_inode_readahead_blks;
1420         unsigned int s_inode_goal;
1421         u32 s_hash_seed[4];
1422         int s_def_hash_version;
1423         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1424         struct percpu_counter s_freeclusters_counter;
1425         struct percpu_counter s_freeinodes_counter;
1426         struct percpu_counter s_dirs_counter;
1427         struct percpu_counter s_dirtyclusters_counter;
1428         struct blockgroup_lock *s_blockgroup_lock;
1429         struct proc_dir_entry *s_proc;
1430         struct kobject s_kobj;
1431         struct completion s_kobj_unregister;
1432         struct super_block *s_sb;
1433 #ifdef CONFIG_UNICODE
1434         struct unicode_map *s_encoding;
1435         __u16 s_encoding_flags;
1436 #endif
1437
1438         /* Journaling */
1439         struct journal_s *s_journal;
1440         struct list_head s_orphan;
1441         struct mutex s_orphan_lock;
1442         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1443         unsigned long s_commit_interval;
1444         u32 s_max_batch_time;
1445         u32 s_min_batch_time;
1446         struct block_device *journal_bdev;
1447 #ifdef CONFIG_QUOTA
1448         /* Names of quota files with journalled quota */
1449         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1450         int s_jquota_fmt;                       /* Format of quota to use */
1451 #endif
1452         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1453         struct ext4_system_blocks __rcu *system_blks;
1454
1455 #ifdef EXTENTS_STATS
1456         /* ext4 extents stats */
1457         unsigned long s_ext_min;
1458         unsigned long s_ext_max;
1459         unsigned long s_depth_max;
1460         spinlock_t s_ext_stats_lock;
1461         unsigned long s_ext_blocks;
1462         unsigned long s_ext_extents;
1463 #endif
1464
1465         /* for buddy allocator */
1466         struct ext4_group_info ***s_group_info;
1467         struct inode *s_buddy_cache;
1468         spinlock_t s_md_lock;
1469         unsigned short *s_mb_offsets;
1470         unsigned int *s_mb_maxs;
1471         unsigned int s_group_info_size;
1472         unsigned int s_mb_free_pending;
1473         struct list_head s_freed_data_list;     /* List of blocks to be freed
1474                                                    after commit completed */
1475
1476         /* tunables */
1477         unsigned long s_stripe;
1478         unsigned int s_mb_stream_request;
1479         unsigned int s_mb_max_to_scan;
1480         unsigned int s_mb_min_to_scan;
1481         unsigned int s_mb_stats;
1482         unsigned int s_mb_order2_reqs;
1483         unsigned int s_mb_group_prealloc;
1484         unsigned int s_max_dir_size_kb;
1485         /* where last allocation was done - for stream allocation */
1486         unsigned long s_mb_last_group;
1487         unsigned long s_mb_last_start;
1488
1489         /* stats for buddy allocator */
1490         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1491         atomic_t s_bal_success; /* we found long enough chunks */
1492         atomic_t s_bal_allocated;       /* in blocks */
1493         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1494         atomic_t s_bal_goals;   /* goal hits */
1495         atomic_t s_bal_breaks;  /* too long searches */
1496         atomic_t s_bal_2orders; /* 2^order hits */
1497         spinlock_t s_bal_lock;
1498         unsigned long s_mb_buddies_generated;
1499         unsigned long long s_mb_generation_time;
1500         atomic_t s_mb_lost_chunks;
1501         atomic_t s_mb_preallocated;
1502         atomic_t s_mb_discarded;
1503         atomic_t s_lock_busy;
1504
1505         /* locality groups */
1506         struct ext4_locality_group __percpu *s_locality_groups;
1507
1508         /* for write statistics */
1509         unsigned long s_sectors_written_start;
1510         u64 s_kbytes_written;
1511
1512         /* the size of zero-out chunk */
1513         unsigned int s_extent_max_zeroout_kb;
1514
1515         unsigned int s_log_groups_per_flex;
1516         struct flex_groups *s_flex_groups;
1517         ext4_group_t s_flex_groups_allocated;
1518
1519         /* workqueue for reserved extent conversions (buffered io) */
1520         struct workqueue_struct *rsv_conversion_wq;
1521
1522         /* timer for periodic error stats printing */
1523         struct timer_list s_err_report;
1524
1525         /* Lazy inode table initialization info */
1526         struct ext4_li_request *s_li_request;
1527         /* Wait multiplier for lazy initialization thread */
1528         unsigned int s_li_wait_mult;
1529
1530         /* Kernel thread for multiple mount protection */
1531         struct task_struct *s_mmp_tsk;
1532
1533         /* record the last minlen when FITRIM is called. */
1534         atomic_t s_last_trim_minblks;
1535
1536         /* Reference to checksum algorithm driver via cryptoapi */
1537         struct crypto_shash *s_chksum_driver;
1538
1539         /* Precomputed FS UUID checksum for seeding other checksums */
1540         __u32 s_csum_seed;
1541
1542         /* Reclaim extents from extent status tree */
1543         struct shrinker s_es_shrinker;
1544         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1545         long s_es_nr_inode;
1546         struct ext4_es_stats s_es_stats;
1547         struct mb_cache *s_ea_block_cache;
1548         struct mb_cache *s_ea_inode_cache;
1549         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1550
1551         /* Ratelimit ext4 messages. */
1552         struct ratelimit_state s_err_ratelimit_state;
1553         struct ratelimit_state s_warning_ratelimit_state;
1554         struct ratelimit_state s_msg_ratelimit_state;
1555
1556         /* Barrier between changing inodes' journal flags and writepages ops. */
1557         struct percpu_rw_semaphore s_journal_flag_rwsem;
1558         struct dax_device *s_daxdev;
1559 };
1560
1561 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1562 {
1563         return sb->s_fs_info;
1564 }
1565 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1566 {
1567         return container_of(inode, struct ext4_inode_info, vfs_inode);
1568 }
1569
1570 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1571 {
1572         return ino == EXT4_ROOT_INO ||
1573                 (ino >= EXT4_FIRST_INO(sb) &&
1574                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1575 }
1576
1577 /*
1578  * Inode dynamic state flags
1579  */
1580 enum {
1581         EXT4_STATE_JDATA,               /* journaled data exists */
1582         EXT4_STATE_NEW,                 /* inode is newly created */
1583         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1584         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1585         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1586         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1587         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1588         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1589         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1590         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1591         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1592 };
1593
1594 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1595 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1596 {                                                                       \
1597         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1598 }                                                                       \
1599 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1600 {                                                                       \
1601         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1602 }                                                                       \
1603 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1604 {                                                                       \
1605         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1606 }
1607
1608 /* Add these declarations here only so that these functions can be
1609  * found by name.  Otherwise, they are very hard to locate. */
1610 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1611 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1612 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1613 EXT4_INODE_BIT_FNS(flag, flags, 0)
1614
1615 /* Add these declarations here only so that these functions can be
1616  * found by name.  Otherwise, they are very hard to locate. */
1617 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1618 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1619 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1620 #if (BITS_PER_LONG < 64)
1621 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1622
1623 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1624 {
1625         (ei)->i_state_flags = 0;
1626 }
1627 #else
1628 EXT4_INODE_BIT_FNS(state, flags, 32)
1629
1630 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1631 {
1632         /* We depend on the fact that callers will set i_flags */
1633 }
1634 #endif
1635 #else
1636 /* Assume that user mode programs are passing in an ext4fs superblock, not
1637  * a kernel struct super_block.  This will allow us to call the feature-test
1638  * macros from user land. */
1639 #define EXT4_SB(sb)     (sb)
1640 #endif
1641
1642 static inline bool ext4_verity_in_progress(struct inode *inode)
1643 {
1644         return IS_ENABLED(CONFIG_FS_VERITY) &&
1645                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1646 }
1647
1648 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1649
1650 /*
1651  * Codes for operating systems
1652  */
1653 #define EXT4_OS_LINUX           0
1654 #define EXT4_OS_HURD            1
1655 #define EXT4_OS_MASIX           2
1656 #define EXT4_OS_FREEBSD         3
1657 #define EXT4_OS_LITES           4
1658
1659 /*
1660  * Revision levels
1661  */
1662 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1663 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1664
1665 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1666 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1667
1668 #define EXT4_GOOD_OLD_INODE_SIZE 128
1669
1670 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1671 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1672 #define EXT4_TIMESTAMP_MIN              S32_MIN
1673
1674 /*
1675  * Feature set definitions
1676  */
1677
1678 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1679 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1680 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1681 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1682 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1683 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1684 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1685 #define EXT4_FEATURE_COMPAT_STABLE_INODES       0x0800
1686
1687 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1688 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1689 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1690 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1691 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1692 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1693 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1694 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1695 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1696 /*
1697  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1698  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1699  * all other data structures' checksums.  However, the METADATA_CSUM and
1700  * GDT_CSUM bits are mutually exclusive.
1701  */
1702 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1703 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1704 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1705 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
1706
1707 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1708 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1709 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1710 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1711 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1712 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1713 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1714 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1715 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1716 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1717 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1718 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1719 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1720 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1721 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1722 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1723
1724 extern void ext4_update_dynamic_rev(struct super_block *sb);
1725
1726 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1727 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1728 { \
1729         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1730                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1731 } \
1732 static inline void ext4_set_feature_##name(struct super_block *sb) \
1733 { \
1734         ext4_update_dynamic_rev(sb); \
1735         EXT4_SB(sb)->s_es->s_feature_compat |= \
1736                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1737 } \
1738 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1739 { \
1740         EXT4_SB(sb)->s_es->s_feature_compat &= \
1741                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1742 }
1743
1744 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1745 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1746 { \
1747         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1748                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1749 } \
1750 static inline void ext4_set_feature_##name(struct super_block *sb) \
1751 { \
1752         ext4_update_dynamic_rev(sb); \
1753         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1754                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1755 } \
1756 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1757 { \
1758         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1759                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1760 }
1761
1762 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1763 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1764 { \
1765         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1766                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1767 } \
1768 static inline void ext4_set_feature_##name(struct super_block *sb) \
1769 { \
1770         ext4_update_dynamic_rev(sb); \
1771         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1772                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1773 } \
1774 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1775 { \
1776         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1777                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1778 }
1779
1780 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1781 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1782 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1783 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1784 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1785 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1786 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1787 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,        STABLE_INODES)
1788
1789 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1790 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1791 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1792 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1793 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1794 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1795 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1796 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1797 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1798 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1799 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1800 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1801 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
1802
1803 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1804 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1805 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1806 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1807 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1808 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1809 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1810 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1811 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1812 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1813 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1814 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1815 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1816 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1817 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1818 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
1819
1820 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1821 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1822                                          EXT4_FEATURE_INCOMPAT_META_BG)
1823 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1824                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1825                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1826
1827 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1828 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1829                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1830                                          EXT4_FEATURE_INCOMPAT_META_BG)
1831 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1832                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1833                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1834
1835 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1836 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1837                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1838                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1839                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1840                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1841                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1842                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1843                                          EXT4_FEATURE_INCOMPAT_MMP | \
1844                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1845                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1846                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1847                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1848                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1849 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1850                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1851                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1852                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1853                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1854                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1855                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1856                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1857                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1858                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1859                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
1860                                          EXT4_FEATURE_RO_COMPAT_VERITY)
1861
1862 #define EXTN_FEATURE_FUNCS(ver) \
1863 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1864 { \
1865         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1866                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1867 } \
1868 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1869 { \
1870         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1871                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1872 } \
1873 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1874 { \
1875         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1876                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1877 }
1878
1879 EXTN_FEATURE_FUNCS(2)
1880 EXTN_FEATURE_FUNCS(3)
1881 EXTN_FEATURE_FUNCS(4)
1882
1883 static inline bool ext4_has_compat_features(struct super_block *sb)
1884 {
1885         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1886 }
1887 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1888 {
1889         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1890 }
1891 static inline bool ext4_has_incompat_features(struct super_block *sb)
1892 {
1893         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1894 }
1895
1896 /*
1897  * Superblock flags
1898  */
1899 #define EXT4_FLAGS_RESIZING     0
1900 #define EXT4_FLAGS_SHUTDOWN     1
1901
1902 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1903 {
1904         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1905 }
1906
1907
1908 /*
1909  * Default values for user and/or group using reserved blocks
1910  */
1911 #define EXT4_DEF_RESUID         0
1912 #define EXT4_DEF_RESGID         0
1913
1914 /*
1915  * Default project ID
1916  */
1917 #define EXT4_DEF_PROJID         0
1918
1919 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1920
1921 /*
1922  * Default mount options
1923  */
1924 #define EXT4_DEFM_DEBUG         0x0001
1925 #define EXT4_DEFM_BSDGROUPS     0x0002
1926 #define EXT4_DEFM_XATTR_USER    0x0004
1927 #define EXT4_DEFM_ACL           0x0008
1928 #define EXT4_DEFM_UID16         0x0010
1929 #define EXT4_DEFM_JMODE         0x0060
1930 #define EXT4_DEFM_JMODE_DATA    0x0020
1931 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1932 #define EXT4_DEFM_JMODE_WBACK   0x0060
1933 #define EXT4_DEFM_NOBARRIER     0x0100
1934 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1935 #define EXT4_DEFM_DISCARD       0x0400
1936 #define EXT4_DEFM_NODELALLOC    0x0800
1937
1938 /*
1939  * Default journal batch times
1940  */
1941 #define EXT4_DEF_MIN_BATCH_TIME 0
1942 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1943
1944 /*
1945  * Minimum number of groups in a flexgroup before we separate out
1946  * directories into the first block group of a flexgroup
1947  */
1948 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1949
1950 /*
1951  * Structure of a directory entry
1952  */
1953 #define EXT4_NAME_LEN 255
1954
1955 struct ext4_dir_entry {
1956         __le32  inode;                  /* Inode number */
1957         __le16  rec_len;                /* Directory entry length */
1958         __le16  name_len;               /* Name length */
1959         char    name[EXT4_NAME_LEN];    /* File name */
1960 };
1961
1962 /*
1963  * The new version of the directory entry.  Since EXT4 structures are
1964  * stored in intel byte order, and the name_len field could never be
1965  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1966  * file_type field.
1967  */
1968 struct ext4_dir_entry_2 {
1969         __le32  inode;                  /* Inode number */
1970         __le16  rec_len;                /* Directory entry length */
1971         __u8    name_len;               /* Name length */
1972         __u8    file_type;
1973         char    name[EXT4_NAME_LEN];    /* File name */
1974 };
1975
1976 /*
1977  * This is a bogus directory entry at the end of each leaf block that
1978  * records checksums.
1979  */
1980 struct ext4_dir_entry_tail {
1981         __le32  det_reserved_zero1;     /* Pretend to be unused */
1982         __le16  det_rec_len;            /* 12 */
1983         __u8    det_reserved_zero2;     /* Zero name length */
1984         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1985         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1986 };
1987
1988 #define EXT4_DIRENT_TAIL(block, blocksize) \
1989         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1990                                         ((blocksize) - \
1991                                          sizeof(struct ext4_dir_entry_tail))))
1992
1993 /*
1994  * Ext4 directory file types.  Only the low 3 bits are used.  The
1995  * other bits are reserved for now.
1996  */
1997 #define EXT4_FT_UNKNOWN         0
1998 #define EXT4_FT_REG_FILE        1
1999 #define EXT4_FT_DIR             2
2000 #define EXT4_FT_CHRDEV          3
2001 #define EXT4_FT_BLKDEV          4
2002 #define EXT4_FT_FIFO            5
2003 #define EXT4_FT_SOCK            6
2004 #define EXT4_FT_SYMLINK         7
2005
2006 #define EXT4_FT_MAX             8
2007
2008 #define EXT4_FT_DIR_CSUM        0xDE
2009
2010 /*
2011  * EXT4_DIR_PAD defines the directory entries boundaries
2012  *
2013  * NOTE: It must be a multiple of 4
2014  */
2015 #define EXT4_DIR_PAD                    4
2016 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2017 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
2018                                          ~EXT4_DIR_ROUND)
2019 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2020
2021 /*
2022  * If we ever get support for fs block sizes > page_size, we'll need
2023  * to remove the #if statements in the next two functions...
2024  */
2025 static inline unsigned int
2026 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2027 {
2028         unsigned len = le16_to_cpu(dlen);
2029
2030 #if (PAGE_SIZE >= 65536)
2031         if (len == EXT4_MAX_REC_LEN || len == 0)
2032                 return blocksize;
2033         return (len & 65532) | ((len & 3) << 16);
2034 #else
2035         return len;
2036 #endif
2037 }
2038
2039 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2040 {
2041         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2042                 BUG();
2043 #if (PAGE_SIZE >= 65536)
2044         if (len < 65536)
2045                 return cpu_to_le16(len);
2046         if (len == blocksize) {
2047                 if (blocksize == 65536)
2048                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2049                 else
2050                         return cpu_to_le16(0);
2051         }
2052         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2053 #else
2054         return cpu_to_le16(len);
2055 #endif
2056 }
2057
2058 /*
2059  * Hash Tree Directory indexing
2060  * (c) Daniel Phillips, 2001
2061  */
2062
2063 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2064                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2065 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2066                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2067 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2068
2069 /* Legal values for the dx_root hash_version field: */
2070
2071 #define DX_HASH_LEGACY                  0
2072 #define DX_HASH_HALF_MD4                1
2073 #define DX_HASH_TEA                     2
2074 #define DX_HASH_LEGACY_UNSIGNED         3
2075 #define DX_HASH_HALF_MD4_UNSIGNED       4
2076 #define DX_HASH_TEA_UNSIGNED            5
2077
2078 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2079                               const void *address, unsigned int length)
2080 {
2081         struct {
2082                 struct shash_desc shash;
2083                 char ctx[4];
2084         } desc;
2085
2086         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2087
2088         desc.shash.tfm = sbi->s_chksum_driver;
2089         *(u32 *)desc.ctx = crc;
2090
2091         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2092
2093         return *(u32 *)desc.ctx;
2094 }
2095
2096 #ifdef __KERNEL__
2097
2098 /* hash info structure used by the directory hash */
2099 struct dx_hash_info
2100 {
2101         u32             hash;
2102         u32             minor_hash;
2103         int             hash_version;
2104         u32             *seed;
2105 };
2106
2107
2108 /* 32 and 64 bit signed EOF for dx directories */
2109 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2110 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2111
2112
2113 /*
2114  * Control parameters used by ext4_htree_next_block
2115  */
2116 #define HASH_NB_ALWAYS          1
2117
2118 struct ext4_filename {
2119         const struct qstr *usr_fname;
2120         struct fscrypt_str disk_name;
2121         struct dx_hash_info hinfo;
2122 #ifdef CONFIG_FS_ENCRYPTION
2123         struct fscrypt_str crypto_buf;
2124 #endif
2125 #ifdef CONFIG_UNICODE
2126         struct fscrypt_str cf_name;
2127 #endif
2128 };
2129
2130 #define fname_name(p) ((p)->disk_name.name)
2131 #define fname_len(p)  ((p)->disk_name.len)
2132
2133 /*
2134  * Describe an inode's exact location on disk and in memory
2135  */
2136 struct ext4_iloc
2137 {
2138         struct buffer_head *bh;
2139         unsigned long offset;
2140         ext4_group_t block_group;
2141 };
2142
2143 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2144 {
2145         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2146 }
2147
2148 static inline bool ext4_is_quota_file(struct inode *inode)
2149 {
2150         return IS_NOQUOTA(inode) &&
2151                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2152 }
2153
2154 /*
2155  * This structure is stuffed into the struct file's private_data field
2156  * for directories.  It is where we put information so that we can do
2157  * readdir operations in hash tree order.
2158  */
2159 struct dir_private_info {
2160         struct rb_root  root;
2161         struct rb_node  *curr_node;
2162         struct fname    *extra_fname;
2163         loff_t          last_pos;
2164         __u32           curr_hash;
2165         __u32           curr_minor_hash;
2166         __u32           next_hash;
2167 };
2168
2169 /* calculate the first block number of the group */
2170 static inline ext4_fsblk_t
2171 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2172 {
2173         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2174                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2175 }
2176
2177 /*
2178  * Special error return code only used by dx_probe() and its callers.
2179  */
2180 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2181
2182 /* htree levels for ext4 */
2183 #define EXT4_HTREE_LEVEL_COMPAT 2
2184 #define EXT4_HTREE_LEVEL        3
2185
2186 static inline int ext4_dir_htree_level(struct super_block *sb)
2187 {
2188         return ext4_has_feature_largedir(sb) ?
2189                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2190 }
2191
2192 /*
2193  * Timeout and state flag for lazy initialization inode thread.
2194  */
2195 #define EXT4_DEF_LI_WAIT_MULT                   10
2196 #define EXT4_DEF_LI_MAX_START_DELAY             5
2197 #define EXT4_LAZYINIT_QUIT                      0x0001
2198 #define EXT4_LAZYINIT_RUNNING                   0x0002
2199
2200 /*
2201  * Lazy inode table initialization info
2202  */
2203 struct ext4_lazy_init {
2204         unsigned long           li_state;
2205         struct list_head        li_request_list;
2206         struct mutex            li_list_mtx;
2207 };
2208
2209 struct ext4_li_request {
2210         struct super_block      *lr_super;
2211         struct ext4_sb_info     *lr_sbi;
2212         ext4_group_t            lr_next_group;
2213         struct list_head        lr_request;
2214         unsigned long           lr_next_sched;
2215         unsigned long           lr_timeout;
2216 };
2217
2218 struct ext4_features {
2219         struct kobject f_kobj;
2220         struct completion f_kobj_unregister;
2221 };
2222
2223 /*
2224  * This structure will be used for multiple mount protection. It will be
2225  * written into the block number saved in the s_mmp_block field in the
2226  * superblock. Programs that check MMP should assume that if
2227  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2228  * to use the filesystem, regardless of how old the timestamp is.
2229  */
2230 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2231 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2232 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2233 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2234
2235 struct mmp_struct {
2236         __le32  mmp_magic;              /* Magic number for MMP */
2237         __le32  mmp_seq;                /* Sequence no. updated periodically */
2238
2239         /*
2240          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2241          * purposes and do not affect the correctness of the algorithm
2242          */
2243         __le64  mmp_time;               /* Time last updated */
2244         char    mmp_nodename[64];       /* Node which last updated MMP block */
2245         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2246
2247         /*
2248          * mmp_check_interval is used to verify if the MMP block has been
2249          * updated on the block device. The value is updated based on the
2250          * maximum time to write the MMP block during an update cycle.
2251          */
2252         __le16  mmp_check_interval;
2253
2254         __le16  mmp_pad1;
2255         __le32  mmp_pad2[226];
2256         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2257 };
2258
2259 /* arguments passed to the mmp thread */
2260 struct mmpd_data {
2261         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2262         struct super_block *sb;  /* super block of the fs */
2263 };
2264
2265 /*
2266  * Check interval multiplier
2267  * The MMP block is written every update interval and initially checked every
2268  * update interval x the multiplier (the value is then adapted based on the
2269  * write latency). The reason is that writes can be delayed under load and we
2270  * don't want readers to incorrectly assume that the filesystem is no longer
2271  * in use.
2272  */
2273 #define EXT4_MMP_CHECK_MULT             2UL
2274
2275 /*
2276  * Minimum interval for MMP checking in seconds.
2277  */
2278 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2279
2280 /*
2281  * Maximum interval for MMP checking in seconds.
2282  */
2283 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2284
2285 /*
2286  * Function prototypes
2287  */
2288
2289 /*
2290  * Ok, these declarations are also in <linux/kernel.h> but none of the
2291  * ext4 source programs needs to include it so they are duplicated here.
2292  */
2293 # define NORET_TYPE     /**/
2294 # define ATTRIB_NORET   __attribute__((noreturn))
2295 # define NORET_AND      noreturn,
2296
2297 /* bitmap.c */
2298 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2299 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2300                                 struct ext4_group_desc *gdp,
2301                                 struct buffer_head *bh, int sz);
2302 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2303                                   struct ext4_group_desc *gdp,
2304                                   struct buffer_head *bh, int sz);
2305 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2306                                 struct ext4_group_desc *gdp,
2307                                 struct buffer_head *bh);
2308 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2309                                   struct ext4_group_desc *gdp,
2310                                   struct buffer_head *bh);
2311
2312 /* balloc.c */
2313 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2314                                          ext4_fsblk_t blocknr,
2315                                          ext4_group_t *blockgrpp,
2316                                          ext4_grpblk_t *offsetp);
2317 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2318                                           ext4_fsblk_t block);
2319
2320 extern unsigned int ext4_block_group(struct super_block *sb,
2321                         ext4_fsblk_t blocknr);
2322 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2323                         ext4_fsblk_t blocknr);
2324 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2325 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2326                         ext4_group_t group);
2327 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2328                                          ext4_fsblk_t goal,
2329                                          unsigned int flags,
2330                                          unsigned long *count,
2331                                          int *errp);
2332 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2333                                     s64 nclusters, unsigned int flags);
2334 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2335 extern void ext4_check_blocks_bitmap(struct super_block *);
2336 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2337                                                     ext4_group_t block_group,
2338                                                     struct buffer_head ** bh);
2339 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2340
2341 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2342                                                 ext4_group_t block_group);
2343 extern int ext4_wait_block_bitmap(struct super_block *sb,
2344                                   ext4_group_t block_group,
2345                                   struct buffer_head *bh);
2346 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2347                                                   ext4_group_t block_group);
2348 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2349                                               ext4_group_t block_group,
2350                                               struct ext4_group_desc *gdp);
2351 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2352
2353 #ifdef CONFIG_UNICODE
2354 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2355                                          const struct qstr *iname,
2356                                          struct fscrypt_str *fname);
2357 #endif
2358
2359 #ifdef CONFIG_FS_ENCRYPTION
2360 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2361                                                 const struct fscrypt_name *src)
2362 {
2363         memset(dst, 0, sizeof(*dst));
2364
2365         dst->usr_fname = src->usr_fname;
2366         dst->disk_name = src->disk_name;
2367         dst->hinfo.hash = src->hash;
2368         dst->hinfo.minor_hash = src->minor_hash;
2369         dst->crypto_buf = src->crypto_buf;
2370 }
2371
2372 static inline int ext4_fname_setup_filename(struct inode *dir,
2373                                             const struct qstr *iname,
2374                                             int lookup,
2375                                             struct ext4_filename *fname)
2376 {
2377         struct fscrypt_name name;
2378         int err;
2379
2380         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2381         if (err)
2382                 return err;
2383
2384         ext4_fname_from_fscrypt_name(fname, &name);
2385
2386 #ifdef CONFIG_UNICODE
2387         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2388 #endif
2389         return 0;
2390 }
2391
2392 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2393                                             struct dentry *dentry,
2394                                             struct ext4_filename *fname)
2395 {
2396         struct fscrypt_name name;
2397         int err;
2398
2399         err = fscrypt_prepare_lookup(dir, dentry, &name);
2400         if (err)
2401                 return err;
2402
2403         ext4_fname_from_fscrypt_name(fname, &name);
2404
2405 #ifdef CONFIG_UNICODE
2406         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2407 #endif
2408         return 0;
2409 }
2410
2411 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2412 {
2413         struct fscrypt_name name;
2414
2415         name.crypto_buf = fname->crypto_buf;
2416         fscrypt_free_filename(&name);
2417
2418         fname->crypto_buf.name = NULL;
2419         fname->usr_fname = NULL;
2420         fname->disk_name.name = NULL;
2421
2422 #ifdef CONFIG_UNICODE
2423         kfree(fname->cf_name.name);
2424         fname->cf_name.name = NULL;
2425 #endif
2426 }
2427 #else /* !CONFIG_FS_ENCRYPTION */
2428 static inline int ext4_fname_setup_filename(struct inode *dir,
2429                                             const struct qstr *iname,
2430                                             int lookup,
2431                                             struct ext4_filename *fname)
2432 {
2433         fname->usr_fname = iname;
2434         fname->disk_name.name = (unsigned char *) iname->name;
2435         fname->disk_name.len = iname->len;
2436
2437 #ifdef CONFIG_UNICODE
2438         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2439 #endif
2440
2441         return 0;
2442 }
2443
2444 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2445                                             struct dentry *dentry,
2446                                             struct ext4_filename *fname)
2447 {
2448         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2449 }
2450
2451 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2452 {
2453 #ifdef CONFIG_UNICODE
2454         kfree(fname->cf_name.name);
2455         fname->cf_name.name = NULL;
2456 #endif
2457 }
2458 #endif /* !CONFIG_FS_ENCRYPTION */
2459
2460 /* dir.c */
2461 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2462                                   struct file *,
2463                                   struct ext4_dir_entry_2 *,
2464                                   struct buffer_head *, char *, int,
2465                                   unsigned int);
2466 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2467         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2468                                         (de), (bh), (buf), (size), (offset)))
2469 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2470                                 __u32 minor_hash,
2471                                 struct ext4_dir_entry_2 *dirent,
2472                                 struct fscrypt_str *ent_name);
2473 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2474 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2475                              struct buffer_head *bh,
2476                              void *buf, int buf_size,
2477                              struct ext4_filename *fname,
2478                              struct ext4_dir_entry_2 **dest_de);
2479 void ext4_insert_dentry(struct inode *inode,
2480                         struct ext4_dir_entry_2 *de,
2481                         int buf_size,
2482                         struct ext4_filename *fname);
2483 static inline void ext4_update_dx_flag(struct inode *inode)
2484 {
2485         if (!ext4_has_feature_dir_index(inode->i_sb))
2486                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2487 }
2488 static const unsigned char ext4_filetype_table[] = {
2489         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2490 };
2491
2492 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2493 {
2494         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2495                 return DT_UNKNOWN;
2496
2497         return ext4_filetype_table[filetype];
2498 }
2499 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2500                              void *buf, int buf_size);
2501
2502 /* fsync.c */
2503 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2504
2505 /* hash.c */
2506 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2507                           struct dx_hash_info *hinfo);
2508
2509 /* ialloc.c */
2510 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2511                                       const struct qstr *qstr, __u32 goal,
2512                                       uid_t *owner, __u32 i_flags,
2513                                       int handle_type, unsigned int line_no,
2514                                       int nblocks);
2515
2516 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2517         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2518                          i_flags, 0, 0, 0)
2519 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2520                                     type, nblocks)                  \
2521         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2522                          0, (type), __LINE__, (nblocks))
2523
2524
2525 extern void ext4_free_inode(handle_t *, struct inode *);
2526 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2527 extern unsigned long ext4_count_free_inodes(struct super_block *);
2528 extern unsigned long ext4_count_dirs(struct super_block *);
2529 extern void ext4_check_inodes_bitmap(struct super_block *);
2530 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2531 extern int ext4_init_inode_table(struct super_block *sb,
2532                                  ext4_group_t group, int barrier);
2533 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2534
2535 /* mballoc.c */
2536 extern const struct seq_operations ext4_mb_seq_groups_ops;
2537 extern long ext4_mb_stats;
2538 extern long ext4_mb_max_to_scan;
2539 extern int ext4_mb_init(struct super_block *);
2540 extern int ext4_mb_release(struct super_block *);
2541 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2542                                 struct ext4_allocation_request *, int *);
2543 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2544 extern void ext4_discard_preallocations(struct inode *);
2545 extern int __init ext4_init_mballoc(void);
2546 extern void ext4_exit_mballoc(void);
2547 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2548                              struct buffer_head *bh, ext4_fsblk_t block,
2549                              unsigned long count, int flags);
2550 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2551                                    ext4_group_t ngroups);
2552 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2553                 ext4_group_t i, struct ext4_group_desc *desc);
2554 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2555                                 ext4_fsblk_t block, unsigned long count);
2556 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2557 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2558
2559 /* inode.c */
2560 int ext4_inode_is_fast_symlink(struct inode *inode);
2561 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2562 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2563 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2564                      bool wait, struct buffer_head **bhs);
2565 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2566                              struct buffer_head *bh_result, int create);
2567 int ext4_get_block(struct inode *inode, sector_t iblock,
2568                    struct buffer_head *bh_result, int create);
2569 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2570                            struct buffer_head *bh, int create);
2571 int ext4_walk_page_buffers(handle_t *handle,
2572                            struct buffer_head *head,
2573                            unsigned from,
2574                            unsigned to,
2575                            int *partial,
2576                            int (*fn)(handle_t *handle,
2577                                      struct buffer_head *bh));
2578 int do_journal_get_write_access(handle_t *handle,
2579                                 struct buffer_head *bh);
2580 #define FALL_BACK_TO_NONDELALLOC 1
2581 #define CONVERT_INLINE_DATA      2
2582
2583 typedef enum {
2584         EXT4_IGET_NORMAL =      0,
2585         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2586         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2587 } ext4_iget_flags;
2588
2589 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2590                                  ext4_iget_flags flags, const char *function,
2591                                  unsigned int line);
2592
2593 #define ext4_iget(sb, ino, flags) \
2594         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2595
2596 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2597 extern int  ext4_setattr(struct dentry *, struct iattr *);
2598 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2599 extern void ext4_evict_inode(struct inode *);
2600 extern void ext4_clear_inode(struct inode *);
2601 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2602 extern int  ext4_sync_inode(handle_t *, struct inode *);
2603 extern void ext4_dirty_inode(struct inode *, int);
2604 extern int ext4_change_inode_journal_flag(struct inode *, int);
2605 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2606 extern int ext4_inode_attach_jinode(struct inode *inode);
2607 extern int ext4_can_truncate(struct inode *inode);
2608 extern int ext4_truncate(struct inode *);
2609 extern int ext4_break_layouts(struct inode *);
2610 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2611 extern void ext4_set_inode_flags(struct inode *);
2612 extern int ext4_alloc_da_blocks(struct inode *inode);
2613 extern void ext4_set_aops(struct inode *inode);
2614 extern int ext4_writepage_trans_blocks(struct inode *);
2615 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2616 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2617                              loff_t lstart, loff_t lend);
2618 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2619 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2620 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2621 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2622 extern void ext4_da_release_space(struct inode *inode, int to_free);
2623 extern void ext4_da_update_reserve_space(struct inode *inode,
2624                                         int used, int quota_claim);
2625 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2626                               ext4_fsblk_t pblk, ext4_lblk_t len);
2627
2628 /* indirect.c */
2629 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2630                                 struct ext4_map_blocks *map, int flags);
2631 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2632 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2633 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2634 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2635                                  ext4_lblk_t start, ext4_lblk_t end);
2636
2637 /* ioctl.c */
2638 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2639 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2640
2641 /* migrate.c */
2642 extern int ext4_ext_migrate(struct inode *);
2643 extern int ext4_ind_migrate(struct inode *inode);
2644
2645 /* namei.c */
2646 extern int ext4_dirblock_csum_verify(struct inode *inode,
2647                                      struct buffer_head *bh);
2648 extern int ext4_orphan_add(handle_t *, struct inode *);
2649 extern int ext4_orphan_del(handle_t *, struct inode *);
2650 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2651                                 __u32 start_minor_hash, __u32 *next_hash);
2652 extern int ext4_search_dir(struct buffer_head *bh,
2653                            char *search_buf,
2654                            int buf_size,
2655                            struct inode *dir,
2656                            struct ext4_filename *fname,
2657                            unsigned int offset,
2658                            struct ext4_dir_entry_2 **res_dir);
2659 extern int ext4_generic_delete_entry(handle_t *handle,
2660                                      struct inode *dir,
2661                                      struct ext4_dir_entry_2 *de_del,
2662                                      struct buffer_head *bh,
2663                                      void *entry_buf,
2664                                      int buf_size,
2665                                      int csum_size);
2666 extern bool ext4_empty_dir(struct inode *inode);
2667
2668 /* resize.c */
2669 extern int ext4_group_add(struct super_block *sb,
2670                                 struct ext4_new_group_data *input);
2671 extern int ext4_group_extend(struct super_block *sb,
2672                                 struct ext4_super_block *es,
2673                                 ext4_fsblk_t n_blocks_count);
2674 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2675
2676 /* super.c */
2677 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2678                                          sector_t block, int op_flags);
2679 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2680 extern int ext4_calculate_overhead(struct super_block *sb);
2681 extern void ext4_superblock_csum_set(struct super_block *sb);
2682 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2683 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2684 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2685                                     ext4_group_t ngroup);
2686 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2687                                      char nbuf[16]);
2688 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2689                                              ext4_group_t block_group,
2690                                              unsigned int flags);
2691
2692 extern __printf(4, 5)
2693 void __ext4_error(struct super_block *, const char *, unsigned int,
2694                   const char *, ...);
2695 extern __printf(5, 6)
2696 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2697                       const char *, ...);
2698 extern __printf(5, 6)
2699 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2700                      const char *, ...);
2701 extern void __ext4_std_error(struct super_block *, const char *,
2702                              unsigned int, int);
2703 extern __printf(4, 5)
2704 void __ext4_abort(struct super_block *, const char *, unsigned int,
2705                   const char *, ...);
2706 extern __printf(4, 5)
2707 void __ext4_warning(struct super_block *, const char *, unsigned int,
2708                     const char *, ...);
2709 extern __printf(4, 5)
2710 void __ext4_warning_inode(const struct inode *inode, const char *function,
2711                           unsigned int line, const char *fmt, ...);
2712 extern __printf(3, 4)
2713 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2714 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2715                            const char *, unsigned int, const char *);
2716 extern __printf(7, 8)
2717 void __ext4_grp_locked_error(const char *, unsigned int,
2718                              struct super_block *, ext4_group_t,
2719                              unsigned long, ext4_fsblk_t,
2720                              const char *, ...);
2721
2722 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2723         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2724
2725 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2726         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2727
2728 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2729         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2730
2731 #ifdef CONFIG_PRINTK
2732
2733 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2734         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2735 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2736         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2737 #define ext4_error(sb, fmt, ...)                                        \
2738         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2739 #define ext4_abort(sb, fmt, ...)                                        \
2740         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2741 #define ext4_warning(sb, fmt, ...)                                      \
2742         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2743 #define ext4_warning_inode(inode, fmt, ...)                             \
2744         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2745 #define ext4_msg(sb, level, fmt, ...)                           \
2746         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2747 #define dump_mmp_msg(sb, mmp, msg)                                      \
2748         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2749 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2750         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2751                                 fmt, ##__VA_ARGS__)
2752
2753 #else
2754
2755 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2756 do {                                                                    \
2757         no_printk(fmt, ##__VA_ARGS__);                                  \
2758         __ext4_error_inode(inode, "", 0, block, " ");                   \
2759 } while (0)
2760 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2761 do {                                                                    \
2762         no_printk(fmt, ##__VA_ARGS__);                                  \
2763         __ext4_error_file(file, "", 0, block, " ");                     \
2764 } while (0)
2765 #define ext4_error(sb, fmt, ...)                                        \
2766 do {                                                                    \
2767         no_printk(fmt, ##__VA_ARGS__);                                  \
2768         __ext4_error(sb, "", 0, " ");                                   \
2769 } while (0)
2770 #define ext4_abort(sb, fmt, ...)                                        \
2771 do {                                                                    \
2772         no_printk(fmt, ##__VA_ARGS__);                                  \
2773         __ext4_abort(sb, "", 0, " ");                                   \
2774 } while (0)
2775 #define ext4_warning(sb, fmt, ...)                                      \
2776 do {                                                                    \
2777         no_printk(fmt, ##__VA_ARGS__);                                  \
2778         __ext4_warning(sb, "", 0, " ");                                 \
2779 } while (0)
2780 #define ext4_warning_inode(inode, fmt, ...)                             \
2781 do {                                                                    \
2782         no_printk(fmt, ##__VA_ARGS__);                                  \
2783         __ext4_warning_inode(inode, "", 0, " ");                        \
2784 } while (0)
2785 #define ext4_msg(sb, level, fmt, ...)                                   \
2786 do {                                                                    \
2787         no_printk(fmt, ##__VA_ARGS__);                                  \
2788         __ext4_msg(sb, "", " ");                                        \
2789 } while (0)
2790 #define dump_mmp_msg(sb, mmp, msg)                                      \
2791         __dump_mmp_msg(sb, mmp, "", 0, "")
2792 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2793 do {                                                                    \
2794         no_printk(fmt, ##__VA_ARGS__);                          \
2795         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2796 } while (0)
2797
2798 #endif
2799
2800 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2801                                         __u32 compat);
2802 extern int ext4_update_rocompat_feature(handle_t *handle,
2803                                         struct super_block *sb, __u32 rocompat);
2804 extern int ext4_update_incompat_feature(handle_t *handle,
2805                                         struct super_block *sb, __u32 incompat);
2806 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2807                                       struct ext4_group_desc *bg);
2808 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2809                                       struct ext4_group_desc *bg);
2810 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2811                                      struct ext4_group_desc *bg);
2812 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2813                                       struct ext4_group_desc *bg);
2814 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2815                                  struct ext4_group_desc *bg);
2816 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2817                                 struct ext4_group_desc *bg);
2818 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2819                                    struct ext4_group_desc *bg);
2820 extern void ext4_block_bitmap_set(struct super_block *sb,
2821                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2822 extern void ext4_inode_bitmap_set(struct super_block *sb,
2823                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2824 extern void ext4_inode_table_set(struct super_block *sb,
2825                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2826 extern void ext4_free_group_clusters_set(struct super_block *sb,
2827                                          struct ext4_group_desc *bg,
2828                                          __u32 count);
2829 extern void ext4_free_inodes_set(struct super_block *sb,
2830                                 struct ext4_group_desc *bg, __u32 count);
2831 extern void ext4_used_dirs_set(struct super_block *sb,
2832                                 struct ext4_group_desc *bg, __u32 count);
2833 extern void ext4_itable_unused_set(struct super_block *sb,
2834                                    struct ext4_group_desc *bg, __u32 count);
2835 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2836                                        struct ext4_group_desc *gdp);
2837 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2838                                      struct ext4_group_desc *gdp);
2839 extern int ext4_register_li_request(struct super_block *sb,
2840                                     ext4_group_t first_not_zeroed);
2841
2842 static inline int ext4_has_metadata_csum(struct super_block *sb)
2843 {
2844         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2845                      !EXT4_SB(sb)->s_chksum_driver);
2846
2847         return ext4_has_feature_metadata_csum(sb) &&
2848                (EXT4_SB(sb)->s_chksum_driver != NULL);
2849 }
2850
2851 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2852 {
2853         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2854 }
2855
2856 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2857 {
2858         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2859                 le32_to_cpu(es->s_blocks_count_lo);
2860 }
2861
2862 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2863 {
2864         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2865                 le32_to_cpu(es->s_r_blocks_count_lo);
2866 }
2867
2868 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2869 {
2870         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2871                 le32_to_cpu(es->s_free_blocks_count_lo);
2872 }
2873
2874 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2875                                          ext4_fsblk_t blk)
2876 {
2877         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2878         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2879 }
2880
2881 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2882                                               ext4_fsblk_t blk)
2883 {
2884         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2885         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2886 }
2887
2888 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2889                                            ext4_fsblk_t blk)
2890 {
2891         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2892         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2893 }
2894
2895 static inline loff_t ext4_isize(struct super_block *sb,
2896                                 struct ext4_inode *raw_inode)
2897 {
2898         if (ext4_has_feature_largedir(sb) ||
2899             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2900                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2901                         le32_to_cpu(raw_inode->i_size_lo);
2902
2903         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2904 }
2905
2906 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2907 {
2908         raw_inode->i_size_lo = cpu_to_le32(i_size);
2909         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2910 }
2911
2912 static inline
2913 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2914                                             ext4_group_t group)
2915 {
2916          struct ext4_group_info ***grp_info;
2917          long indexv, indexh;
2918          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2919          grp_info = EXT4_SB(sb)->s_group_info;
2920          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2921          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2922          return grp_info[indexv][indexh];
2923 }
2924
2925 /*
2926  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2927  * the locking protocol documented in the comments of ext4_group_add()
2928  * in resize.c
2929  */
2930 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2931 {
2932         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2933
2934         smp_rmb();
2935         return ngroups;
2936 }
2937
2938 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2939                                              ext4_group_t block_group)
2940 {
2941         return block_group >> sbi->s_log_groups_per_flex;
2942 }
2943
2944 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2945 {
2946         return 1 << sbi->s_log_groups_per_flex;
2947 }
2948
2949 #define ext4_std_error(sb, errno)                               \
2950 do {                                                            \
2951         if ((errno))                                            \
2952                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2953 } while (0)
2954
2955 #ifdef CONFIG_SMP
2956 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2957  * counters. So we need to make sure we have free clusters more
2958  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2959  */
2960 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2961 #else
2962 #define EXT4_FREECLUSTERS_WATERMARK 0
2963 #endif
2964
2965 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2966 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2967 {
2968         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2969                      !inode_is_locked(inode));
2970         down_write(&EXT4_I(inode)->i_data_sem);
2971         if (newsize > EXT4_I(inode)->i_disksize)
2972                 EXT4_I(inode)->i_disksize = newsize;
2973         up_write(&EXT4_I(inode)->i_data_sem);
2974 }
2975
2976 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2977 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2978 {
2979         int changed = 0;
2980
2981         if (newsize > inode->i_size) {
2982                 i_size_write(inode, newsize);
2983                 changed = 1;
2984         }
2985         if (newsize > EXT4_I(inode)->i_disksize) {
2986                 ext4_update_i_disksize(inode, newsize);
2987                 changed |= 2;
2988         }
2989         return changed;
2990 }
2991
2992 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2993                                       loff_t len);
2994
2995 struct ext4_group_info {
2996         unsigned long   bb_state;
2997         struct rb_root  bb_free_root;
2998         ext4_grpblk_t   bb_first_free;  /* first free block */
2999         ext4_grpblk_t   bb_free;        /* total free blocks */
3000         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3001         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3002         struct          list_head bb_prealloc_list;
3003 #ifdef DOUBLE_CHECK
3004         void            *bb_bitmap;
3005 #endif
3006         struct rw_semaphore alloc_sem;
3007         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3008                                          * regions, index is order.
3009                                          * bb_counters[3] = 5 means
3010                                          * 5 free 8-block regions. */
3011 };
3012
3013 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3014 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3015 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3016 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3017 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3018         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3019 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3020         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3021
3022 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3023         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3024 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3025         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3026 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3027         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3028
3029 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3030         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3031 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3032         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3033 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3034         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3035
3036 #define EXT4_MAX_CONTENTION             8
3037 #define EXT4_CONTENTION_THRESHOLD       2
3038
3039 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3040                                               ext4_group_t group)
3041 {
3042         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3043 }
3044
3045 /*
3046  * Returns true if the filesystem is busy enough that attempts to
3047  * access the block group locks has run into contention.
3048  */
3049 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3050 {
3051         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3052 }
3053
3054 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3055 {
3056         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3057         if (spin_trylock(lock))
3058                 /*
3059                  * We're able to grab the lock right away, so drop the
3060                  * lock contention counter.
3061                  */
3062                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3063         else {
3064                 /*
3065                  * The lock is busy, so bump the contention counter,
3066                  * and then wait on the spin lock.
3067                  */
3068                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3069                                   EXT4_MAX_CONTENTION);
3070                 spin_lock(lock);
3071         }
3072 }
3073
3074 static inline void ext4_unlock_group(struct super_block *sb,
3075                                         ext4_group_t group)
3076 {
3077         spin_unlock(ext4_group_lock_ptr(sb, group));
3078 }
3079
3080 /*
3081  * Block validity checking
3082  */
3083 #define ext4_check_indirect_blockref(inode, bh)                         \
3084         ext4_check_blockref(__func__, __LINE__, inode,                  \
3085                             (__le32 *)(bh)->b_data,                     \
3086                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3087
3088 #define ext4_ind_check_inode(inode)                                     \
3089         ext4_check_blockref(__func__, __LINE__, inode,                  \
3090                             EXT4_I(inode)->i_data,                      \
3091                             EXT4_NDIR_BLOCKS)
3092
3093 /*
3094  * Inodes and files operations
3095  */
3096
3097 /* dir.c */
3098 extern const struct file_operations ext4_dir_operations;
3099
3100 #ifdef CONFIG_UNICODE
3101 extern const struct dentry_operations ext4_dentry_ops;
3102 #endif
3103
3104 /* file.c */
3105 extern const struct inode_operations ext4_file_inode_operations;
3106 extern const struct file_operations ext4_file_operations;
3107 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3108
3109 /* inline.c */
3110 extern int ext4_get_max_inline_size(struct inode *inode);
3111 extern int ext4_find_inline_data_nolock(struct inode *inode);
3112 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3113                                  unsigned int len);
3114 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3115
3116 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3117 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3118                                          struct inode *inode,
3119                                          loff_t pos, unsigned len,
3120                                          unsigned flags,
3121                                          struct page **pagep);
3122 extern int ext4_write_inline_data_end(struct inode *inode,
3123                                       loff_t pos, unsigned len,
3124                                       unsigned copied,
3125                                       struct page *page);
3126 extern struct buffer_head *
3127 ext4_journalled_write_inline_data(struct inode *inode,
3128                                   unsigned len,
3129                                   struct page *page);
3130 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3131                                            struct inode *inode,
3132                                            loff_t pos, unsigned len,
3133                                            unsigned flags,
3134                                            struct page **pagep,
3135                                            void **fsdata);
3136 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3137                                          unsigned len, unsigned copied,
3138                                          struct page *page);
3139 extern int ext4_try_add_inline_entry(handle_t *handle,
3140                                      struct ext4_filename *fname,
3141                                      struct inode *dir, struct inode *inode);
3142 extern int ext4_try_create_inline_dir(handle_t *handle,
3143                                       struct inode *parent,
3144                                       struct inode *inode);
3145 extern int ext4_read_inline_dir(struct file *filp,
3146                                 struct dir_context *ctx,
3147                                 int *has_inline_data);
3148 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3149                                   struct inode *dir, ext4_lblk_t block,
3150                                   struct dx_hash_info *hinfo,
3151                                   __u32 start_hash, __u32 start_minor_hash,
3152                                   int *has_inline_data);
3153 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3154                                         struct ext4_filename *fname,
3155                                         struct ext4_dir_entry_2 **res_dir,
3156                                         int *has_inline_data);
3157 extern int ext4_delete_inline_entry(handle_t *handle,
3158                                     struct inode *dir,
3159                                     struct ext4_dir_entry_2 *de_del,
3160                                     struct buffer_head *bh,
3161                                     int *has_inline_data);
3162 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3163 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3164                                         struct ext4_dir_entry_2 **parent_de,
3165                                         int *retval);
3166 extern int ext4_inline_data_fiemap(struct inode *inode,
3167                                    struct fiemap_extent_info *fieinfo,
3168                                    int *has_inline, __u64 start, __u64 len);
3169
3170 struct iomap;
3171 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3172
3173 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3174
3175 extern int ext4_convert_inline_data(struct inode *inode);
3176
3177 static inline int ext4_has_inline_data(struct inode *inode)
3178 {
3179         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3180                EXT4_I(inode)->i_inline_off;
3181 }
3182
3183 /* namei.c */
3184 extern const struct inode_operations ext4_dir_inode_operations;
3185 extern const struct inode_operations ext4_special_inode_operations;
3186 extern struct dentry *ext4_get_parent(struct dentry *child);
3187 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3188                                  struct ext4_dir_entry_2 *de,
3189                                  int blocksize, int csum_size,
3190                                  unsigned int parent_ino, int dotdot_real_len);
3191 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3192                                         unsigned int blocksize);
3193 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3194                                       struct buffer_head *bh);
3195 extern int ext4_ci_compare(const struct inode *parent,
3196                            const struct qstr *fname,
3197                            const struct qstr *entry, bool quick);
3198
3199 #define S_SHIFT 12
3200 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3201         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3202         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3203         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3204         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3205         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3206         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3207         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3208 };
3209
3210 static inline void ext4_set_de_type(struct super_block *sb,
3211                                 struct ext4_dir_entry_2 *de,
3212                                 umode_t mode) {
3213         if (ext4_has_feature_filetype(sb))
3214                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3215 }
3216
3217 /* readpages.c */
3218 extern int ext4_mpage_readpages(struct address_space *mapping,
3219                                 struct list_head *pages, struct page *page,
3220                                 unsigned nr_pages, bool is_readahead);
3221 extern int __init ext4_init_post_read_processing(void);
3222 extern void ext4_exit_post_read_processing(void);
3223
3224 /* symlink.c */
3225 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3226 extern const struct inode_operations ext4_symlink_inode_operations;
3227 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3228
3229 /* sysfs.c */
3230 extern int ext4_register_sysfs(struct super_block *sb);
3231 extern void ext4_unregister_sysfs(struct super_block *sb);
3232 extern int __init ext4_init_sysfs(void);
3233 extern void ext4_exit_sysfs(void);
3234
3235 /* block_validity */
3236 extern void ext4_release_system_zone(struct super_block *sb);
3237 extern int ext4_setup_system_zone(struct super_block *sb);
3238 extern int __init ext4_init_system_zone(void);
3239 extern void ext4_exit_system_zone(void);
3240 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3241                                  ext4_fsblk_t start_blk,
3242                                  unsigned int count);
3243 extern int ext4_check_blockref(const char *, unsigned int,
3244                                struct inode *, __le32 *, unsigned int);
3245
3246 /* extents.c */
3247 struct ext4_ext_path;
3248 struct ext4_extent;
3249
3250 /*
3251  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3252  * __le32.
3253  */
3254 #define EXT_MAX_BLOCKS  0xffffffff
3255
3256 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3257 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3258 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3259 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3260                                struct ext4_map_blocks *map, int flags);
3261 extern int ext4_ext_truncate(handle_t *, struct inode *);
3262 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3263                                  ext4_lblk_t end);
3264 extern void ext4_ext_init(struct super_block *);
3265 extern void ext4_ext_release(struct super_block *);
3266 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3267                           loff_t len);
3268 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3269                                           loff_t offset, ssize_t len);
3270 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3271                                              ext4_io_end_t *io_end);
3272 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3273                            struct ext4_map_blocks *map, int flags);
3274 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3275                                          ext4_lblk_t lblocks);
3276 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3277                                                    int num,
3278                                                    struct ext4_ext_path *path);
3279 extern int ext4_can_extents_be_merged(struct inode *inode,
3280                                       struct ext4_extent *ex1,
3281                                       struct ext4_extent *ex2);
3282 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3283                                   struct ext4_ext_path **,
3284                                   struct ext4_extent *, int);
3285 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3286                                               struct ext4_ext_path **,
3287                                               int flags);
3288 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3289 extern int ext4_ext_check_inode(struct inode *inode);
3290 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3291 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3292                         __u64 start, __u64 len);
3293 extern int ext4_get_es_cache(struct inode *inode,
3294                              struct fiemap_extent_info *fieinfo,
3295                              __u64 start, __u64 len);
3296 extern int ext4_ext_precache(struct inode *inode);
3297 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3298 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3299 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3300                                 struct inode *inode2, ext4_lblk_t lblk1,
3301                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3302                              int mark_unwritten,int *err);
3303 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3304 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3305                                        int check_cred, int restart_cred,
3306                                        int revoke_cred);
3307
3308
3309 /* move_extent.c */
3310 extern void ext4_double_down_write_data_sem(struct inode *first,
3311                                             struct inode *second);
3312 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3313                                           struct inode *donor_inode);
3314 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3315                              __u64 start_orig, __u64 start_donor,
3316                              __u64 len, __u64 *moved_len);
3317
3318 /* page-io.c */
3319 extern int __init ext4_init_pageio(void);
3320 extern void ext4_exit_pageio(void);
3321 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3322 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3323 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3324 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3325 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3326                                 struct writeback_control *wbc);
3327 extern void ext4_end_io_rsv_work(struct work_struct *work);
3328 extern void ext4_io_submit(struct ext4_io_submit *io);
3329 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3330                                struct page *page,
3331                                int len,
3332                                struct writeback_control *wbc,
3333                                bool keep_towrite);
3334 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3335 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3336
3337 /* mmp.c */
3338 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3339
3340 /* verity.c */
3341 extern const struct fsverity_operations ext4_verityops;
3342
3343 /*
3344  * Add new method to test whether block and inode bitmaps are properly
3345  * initialized. With uninit_bg reading the block from disk is not enough
3346  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3347  */
3348 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3349
3350 static inline int bitmap_uptodate(struct buffer_head *bh)
3351 {
3352         return (buffer_uptodate(bh) &&
3353                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3354 }
3355 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3356 {
3357         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3358 }
3359
3360 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3361
3362 /* For ioend & aio unwritten conversion wait queues */
3363 #define EXT4_WQ_HASH_SZ         37
3364 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3365                                             EXT4_WQ_HASH_SZ])
3366 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3367
3368 extern int ext4_resize_begin(struct super_block *sb);
3369 extern void ext4_resize_end(struct super_block *sb);
3370
3371 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3372                                               struct ext4_io_end *io_end)
3373 {
3374         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3375                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3376                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3377         }
3378 }
3379
3380 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3381 {
3382         struct inode *inode = io_end->inode;
3383
3384         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3385                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3386                 /* Wake up anyone waiting on unwritten extent conversion */
3387                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3388                         wake_up_all(ext4_ioend_wq(inode));
3389         }
3390 }
3391
3392 extern const struct iomap_ops ext4_iomap_ops;
3393 extern const struct iomap_ops ext4_iomap_report_ops;
3394
3395 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3396 {
3397         /*
3398          * If the buffer has the write error flag, we have failed
3399          * to write out data in the block.  In this  case, we don't
3400          * have to read the block because we may read the old data
3401          * successfully.
3402          */
3403         if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3404                 set_buffer_uptodate(bh);
3405         return buffer_uptodate(bh);
3406 }
3407
3408 #endif  /* __KERNEL__ */
3409
3410 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3411 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3412
3413 #endif  /* _EXT4_H */