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 /*
 202  * For converting unwritten extents on a work queue. 'handle' is used for
 203  * buffered writeback.
 204  */
 205 typedef struct ext4_io_end {
 206         struct list_head        list;           /* per-file finished IO list */
 207         handle_t                *handle;        /* handle reserved for extent
 208                                                  * conversion */
 209         struct inode            *inode;         /* file being written to */
 210         struct bio              *bio;           /* Linked list of completed
 211                                                  * bios covering the extent */
 212         unsigned int            flag;           /* unwritten or not */
 213         atomic_t                count;          /* reference counter */
 214         loff_t                  offset;         /* offset in the file */
 215         ssize_t                 size;           /* size of the extent */
 216 } ext4_io_end_t;
 217
 218 struct ext4_io_submit {
 219         struct writeback_control *io_wbc;
 220         struct bio              *io_bio;
 221         ext4_io_end_t           *io_end;
 222         sector_t                io_next_block;
 223 };
 224
 225 /*
 226  * Special inodes numbers
 227  */
 228 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 229 #define EXT4_ROOT_INO            2      /* Root inode */
 230 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 231 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 232 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 233 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 234 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 235 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 236
 237 /* First non-reserved inode for old ext4 filesystems */
 238 #define EXT4_GOOD_OLD_FIRST_INO 11
 239
 240 /*
 241  * Maximal count of links to a file
 242  */
 243 #define EXT4_LINK_MAX           65000
 244
 245 /*
 246  * Macro-instructions used to manage several block sizes
 247  */
 248 #define EXT4_MIN_BLOCK_SIZE             1024
 249 #define EXT4_MAX_BLOCK_SIZE             65536
 250 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 251 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 252 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 253 #ifdef __KERNEL__
 254 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 255 #else
 256 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 257 #endif
 258 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 259 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 260                                          EXT4_SB(s)->s_cluster_bits)
 261 #ifdef __KERNEL__
 262 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 263 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 264 #else
 265 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 266 #endif
 267 #ifdef __KERNEL__
 268 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 269 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 270 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 271 #else
 272 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 273                                  EXT4_GOOD_OLD_INODE_SIZE : \
 274                                  (s)->s_inode_size)
 275 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 276                                  EXT4_GOOD_OLD_FIRST_INO : \
 277                                  (s)->s_first_ino)
 278 #endif
 279 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 280 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 281         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 282                                                                   blkbits))
 283
 284 /* Translate a block number to a cluster number */
 285 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 286 /* Translate a cluster number to a block number */
 287 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 288 /* Translate # of blks to # of clusters */
 289 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 290                                  (sbi)->s_cluster_bits)
 291 /* Mask out the low bits to get the starting block of the cluster */
 292 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 293                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 294 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 295                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 296 /* Fill in the low bits to get the last block of the cluster */
 297 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 298                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 299 /* Get the cluster offset */
 300 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 301                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 302 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 303                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 304
 305 /*
 306  * Structure of a blocks group descriptor
 307  */
 308 struct ext4_group_desc
 309 {
 310         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 311         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 312         __le32  bg_inode_table_lo;      /* Inodes table block */
 313         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 314         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 315         __le16  bg_used_dirs_count_lo;  /* Directories count */
 316         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 317         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 318         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 319         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 320         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 321         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 322         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 323         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 324         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 325         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 326         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 327         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 328         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 329         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 330         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 331         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 332         __u32   bg_reserved;
 333 };
 334
 335 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 336         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 337          sizeof(__le16))
 338 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 339         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 340          sizeof(__le16))
 341
 342 /*
 343  * Structure of a flex block group info
 344  */
 345
 346 struct flex_groups {
 347         atomic64_t      free_clusters;
 348         atomic_t        free_inodes;
 349         atomic_t        used_dirs;
 350 };
 351
 352 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 353 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 354 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 355
 356 /*
 357  * Macro-instructions used to manage group descriptors
 358  */
 359 #define EXT4_MIN_DESC_SIZE              32
 360 #define EXT4_MIN_DESC_SIZE_64BIT        64
 361 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 362 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 363 #ifdef __KERNEL__
 364 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 365 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 366 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 367 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 368 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 369 #else
 370 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 371 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 372 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 373 #endif
 374
 375 /*
 376  * Constants relative to the data blocks
 377  */
 378 #define EXT4_NDIR_BLOCKS                12
 379 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 380 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 381 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 382 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 383
 384 /*
 385  * Inode flags
 386  */
 387 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 388 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 389 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 390 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 391 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 392 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 393 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 394 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 395 /* Reserved for compression usage... */
 396 #define EXT4_DIRTY_FL                   0x00000100
 397 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 398 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 399         /* nb: was previously EXT2_ECOMPR_FL */
 400 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 401 /* End compression flags --- maybe not all used */
 402 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 403 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 404 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 405 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 406 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 407 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 408 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 409 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 410 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 411 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 412 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 413 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 414 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 415 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded file */
 416 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 417
 418 #define EXT4_FL_USER_VISIBLE            0x705BDFFF /* User visible flags */
 419 #define EXT4_FL_USER_MODIFIABLE         0x604BC0FF /* User modifiable flags */
 420
 421 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 422 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 423                                          EXT4_IMMUTABLE_FL | \
 424                                          EXT4_APPEND_FL | \
 425                                          EXT4_NODUMP_FL | \
 426                                          EXT4_NOATIME_FL | \
 427                                          EXT4_PROJINHERIT_FL)
 428
 429 /* Flags that should be inherited by new inodes from their parent. */
 430 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 431                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 432                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 433                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 434                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
 435
 436 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 437 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 438                            EXT4_PROJINHERIT_FL))
 439
 440 /* Flags that are appropriate for non-directories/regular files. */
 441 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 442
 443 /* The only flags that should be swapped */
 444 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 445
 446 /* Mask out flags that are inappropriate for the given type of inode. */
 447 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 448 {
 449         if (S_ISDIR(mode))
 450                 return flags;
 451         else if (S_ISREG(mode))
 452                 return flags & EXT4_REG_FLMASK;
 453         else
 454                 return flags & EXT4_OTHER_FLMASK;
 455 }
 456
 457 /*
 458  * Inode flags used for atomic set/get
 459  */
 460 enum {
 461         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 462         EXT4_INODE_UNRM         = 1,    /* Undelete */
 463         EXT4_INODE_COMPR        = 2,    /* Compress file */
 464         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 465         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 466         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 467         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 468         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 469 /* Reserved for compression usage... */
 470         EXT4_INODE_DIRTY        = 8,
 471         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 472         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 473         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 474 /* End compression flags --- maybe not all used */
 475         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 476         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 477         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 478         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 479         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 480         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 481         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 482         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 483         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 484         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 485         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 486         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 487         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 488         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 489 };
 490
 491 /*
 492  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 493  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 494  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 495  * any extra space in the compiled kernel image, otherwise, the build will fail.
 496  * It's important that these values are the same, since we are using
 497  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 498  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 499  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 500  * defined in e2fsprogs.
 501  *
 502  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 503  */
 504 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 505 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 506
 507 static inline void ext4_check_flag_values(void)
 508 {
 509         CHECK_FLAG_VALUE(SECRM);
 510         CHECK_FLAG_VALUE(UNRM);
 511         CHECK_FLAG_VALUE(COMPR);
 512         CHECK_FLAG_VALUE(SYNC);
 513         CHECK_FLAG_VALUE(IMMUTABLE);
 514         CHECK_FLAG_VALUE(APPEND);
 515         CHECK_FLAG_VALUE(NODUMP);
 516         CHECK_FLAG_VALUE(NOATIME);
 517         CHECK_FLAG_VALUE(DIRTY);
 518         CHECK_FLAG_VALUE(COMPRBLK);
 519         CHECK_FLAG_VALUE(NOCOMPR);
 520         CHECK_FLAG_VALUE(ENCRYPT);
 521         CHECK_FLAG_VALUE(INDEX);
 522         CHECK_FLAG_VALUE(IMAGIC);
 523         CHECK_FLAG_VALUE(JOURNAL_DATA);
 524         CHECK_FLAG_VALUE(NOTAIL);
 525         CHECK_FLAG_VALUE(DIRSYNC);
 526         CHECK_FLAG_VALUE(TOPDIR);
 527         CHECK_FLAG_VALUE(HUGE_FILE);
 528         CHECK_FLAG_VALUE(EXTENTS);
 529         CHECK_FLAG_VALUE(VERITY);
 530         CHECK_FLAG_VALUE(EA_INODE);
 531         CHECK_FLAG_VALUE(EOFBLOCKS);
 532         CHECK_FLAG_VALUE(INLINE_DATA);
 533         CHECK_FLAG_VALUE(PROJINHERIT);
 534         CHECK_FLAG_VALUE(RESERVED);
 535 }
 536
 537 /* Used to pass group descriptor data when online resize is done */
 538 struct ext4_new_group_input {
 539         __u32 group;            /* Group number for this data */
 540         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 541         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 542         __u64 inode_table;      /* Absolute block number of inode table start */
 543         __u32 blocks_count;     /* Total number of blocks in this group */
 544         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 545         __u16 unused;
 546 };
 547
 548 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 549 struct compat_ext4_new_group_input {
 550         u32 group;
 551         compat_u64 block_bitmap;
 552         compat_u64 inode_bitmap;
 553         compat_u64 inode_table;
 554         u32 blocks_count;
 555         u16 reserved_blocks;
 556         u16 unused;
 557 };
 558 #endif
 559
 560 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 561 struct ext4_new_group_data {
 562         __u32 group;
 563         __u64 block_bitmap;
 564         __u64 inode_bitmap;
 565         __u64 inode_table;
 566         __u32 blocks_count;
 567         __u16 reserved_blocks;
 568         __u16 mdata_blocks;
 569         __u32 free_clusters_count;
 570 };
 571
 572 /* Indexes used to index group tables in ext4_new_group_data */
 573 enum {
 574         BLOCK_BITMAP = 0,       /* block bitmap */
 575         INODE_BITMAP,           /* inode bitmap */
 576         INODE_TABLE,            /* inode tables */
 577         GROUP_TABLE_COUNT,
 578 };
 579
 580 /*
 581  * Flags used by ext4_map_blocks()
 582  */
 583         /* Allocate any needed blocks and/or convert an unwritten
 584            extent to be an initialized ext4 */
 585 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 586         /* Request the creation of an unwritten extent */
 587 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 588 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 589                                                  EXT4_GET_BLOCKS_CREATE)
 590         /* Caller is from the delayed allocation writeout path
 591          * finally doing the actual allocation of delayed blocks */
 592 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 593         /* caller is from the direct IO path, request to creation of an
 594         unwritten extents if not allocated, split the unwritten
 595         extent if blocks has been preallocated already*/
 596 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 597 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 598 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 599                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 600         /* Convert extent to initialized after IO complete */
 601 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 602                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 603         /* Eventual metadata allocation (due to growing extent tree)
 604          * should not fail, so try to use reserved blocks for that.*/
 605 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 606         /* Don't normalize allocation size (used for fallocate) */
 607 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 608         /* Request will not result in inode size update (user for fallocate) */
 609 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 610         /* Convert written extents to unwritten */
 611 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 612         /* Write zeros to newly created written extents */
 613 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 614 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 615                                         EXT4_GET_BLOCKS_ZERO)
 616         /* Caller will submit data before dropping transaction handle. This
 617          * allows jbd2 to avoid submitting data before commit. */
 618 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 619
 620 /*
 621  * The bit position of these flags must not overlap with any of the
 622  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 623  * read_extent_tree_block(), ext4_split_extent_at(),
 624  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 625  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 626  * caching the extents when reading from the extent tree while a
 627  * truncate or punch hole operation is in progress.
 628  */
 629 #define EXT4_EX_NOCACHE                         0x40000000
 630 #define EXT4_EX_FORCE_CACHE                     0x20000000
 631
 632 /*
 633  * Flags used by ext4_free_blocks
 634  */
 635 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 636 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 637 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 638 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 639 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 640 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 641 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 642
 643 /*
 644  * ioctl commands
 645  */
 646 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 647 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 648 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 649 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 650 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 651 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 652 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 653 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 654 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 655 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 656 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 657  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 658  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 659 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 660 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 661 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 662 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 663 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 664 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 665 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 666 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 667 /* ioctl codes 19--39 are reserved for fscrypt */
 668 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 669 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 670 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 671
 672 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 673 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 674
 675 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 676
 677 /*
 678  * Flags for going down operation
 679  */
 680 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 681 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 682 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 683
 684 /*
 685  * Flags returned by EXT4_IOC_GETSTATE
 686  *
 687  * We only expose to userspace a subset of the state flags in
 688  * i_state_flags
 689  */
 690 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 691 #define EXT4_STATE_FLAG_NEW             0x00000002
 692 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 693 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 694
 695 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 696 /*
 697  * ioctl commands in 32 bit emulation
 698  */
 699 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 700 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 701 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 702 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 703 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 704 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 705 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 706 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 707 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 708 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 709 #endif
 710
 711 /*
 712  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 713  * It indicates that the entry in extent status cache is for a hole.
 714  */
 715 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 716
 717 /* Max physical block we can address w/o extents */
 718 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 719
 720 /* Max logical block we can support */
 721 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 722
 723 /*
 724  * Structure of an inode on the disk
 725  */
 726 struct ext4_inode {
 727         __le16  i_mode;         /* File mode */
 728         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 729         __le32  i_size_lo;      /* Size in bytes */
 730         __le32  i_atime;        /* Access time */
 731         __le32  i_ctime;        /* Inode Change time */
 732         __le32  i_mtime;        /* Modification time */
 733         __le32  i_dtime;        /* Deletion Time */
 734         __le16  i_gid;          /* Low 16 bits of Group Id */
 735         __le16  i_links_count;  /* Links count */
 736         __le32  i_blocks_lo;    /* Blocks count */
 737         __le32  i_flags;        /* File flags */
 738         union {
 739                 struct {
 740                         __le32  l_i_version;
 741                 } linux1;
 742                 struct {
 743                         __u32  h_i_translator;
 744                 } hurd1;
 745                 struct {
 746                         __u32  m_i_reserved1;
 747                 } masix1;
 748         } osd1;                         /* OS dependent 1 */
 749         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 750         __le32  i_generation;   /* File version (for NFS) */
 751         __le32  i_file_acl_lo;  /* File ACL */
 752         __le32  i_size_high;
 753         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 754         union {
 755                 struct {
 756                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 757                         __le16  l_i_file_acl_high;
 758                         __le16  l_i_uid_high;   /* these 2 fields */
 759                         __le16  l_i_gid_high;   /* were reserved2[0] */
 760                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 761                         __le16  l_i_reserved;
 762                 } linux2;
 763                 struct {
 764                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 765                         __u16   h_i_mode_high;
 766                         __u16   h_i_uid_high;
 767                         __u16   h_i_gid_high;
 768                         __u32   h_i_author;
 769                 } hurd2;
 770                 struct {
 771                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 772                         __le16  m_i_file_acl_high;
 773                         __u32   m_i_reserved2[2];
 774                 } masix2;
 775         } osd2;                         /* OS dependent 2 */
 776         __le16  i_extra_isize;
 777         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 778         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 779         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 780         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 781         __le32  i_crtime;       /* File Creation time */
 782         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 783         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 784         __le32  i_projid;       /* Project ID */
 785 };
 786
 787 struct move_extent {
 788         __u32 reserved;         /* should be zero */
 789         __u32 donor_fd;         /* donor file descriptor */
 790         __u64 orig_start;       /* logical start offset in block for orig */
 791         __u64 donor_start;      /* logical start offset in block for donor */
 792         __u64 len;              /* block length to be moved */
 793         __u64 moved_len;        /* moved block length */
 794 };
 795
 796 #define EXT4_EPOCH_BITS 2
 797 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 798 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 799
 800 /*
 801  * Extended fields will fit into an inode if the filesystem was formatted
 802  * with large inodes (-I 256 or larger) and there are not currently any EAs
 803  * consuming all of the available space. For new inodes we always reserve
 804  * enough space for the kernel's known extended fields, but for inodes
 805  * created with an old kernel this might not have been the case. None of
 806  * the extended inode fields is critical for correct filesystem operation.
 807  * This macro checks if a certain field fits in the inode. Note that
 808  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 809  */
 810 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 811         ((offsetof(typeof(*ext4_inode), field) +        \
 812           sizeof((ext4_inode)->field))                  \
 813         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 814             (einode)->i_extra_isize))                   \
 815
 816 /*
 817  * We use an encoding that preserves the times for extra epoch "00":
 818  *
 819  * extra  msb of                         adjust for signed
 820  * epoch  32-bit                         32-bit tv_sec to
 821  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 822  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 823  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 824  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 825  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 826  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 827  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 828  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 829  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 830  *
 831  * Note that previous versions of the kernel on 64-bit systems would
 832  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 833  * 1970.  e2fsck will correct this, assuming that it is run on the
 834  * affected filesystem before 2242.
 835  */
 836
 837 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 838 {
 839         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 840         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 841 }
 842
 843 static inline void ext4_decode_extra_time(struct timespec64 *time,
 844                                           __le32 extra)
 845 {
 846         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 847                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 848         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 849 }
 850
 851 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 852 do {                                                                            \
 853         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 854                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 855                 (raw_inode)->xtime ## _extra =                                  \
 856                                 ext4_encode_extra_time(&(inode)->xtime);        \
 857                 }                                                               \
 858         else    \
 859                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 860 } while (0)
 861
 862 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 863 do {                                                                           \
 864         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 865                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 866         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 867                 (raw_inode)->xtime ## _extra =                                 \
 868                                 ext4_encode_extra_time(&(einode)->xtime);      \
 869 } while (0)
 870
 871 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 872 do {                                                                            \
 873         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 874         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 875                 ext4_decode_extra_time(&(inode)->xtime,                         \
 876                                        raw_inode->xtime ## _extra);             \
 877                 }                                                               \
 878         else                                                                    \
 879                 (inode)->xtime.tv_nsec = 0;                                     \
 880 } while (0)
 881
 882
 883 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 884 do {                                                                           \
 885         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 886                 (einode)->xtime.tv_sec =                                       \
 887                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 888         else                                                                   \
 889                 (einode)->xtime.tv_sec = 0;                                    \
 890         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 891                 ext4_decode_extra_time(&(einode)->xtime,                       \
 892                                        raw_inode->xtime ## _extra);            \
 893         else                                                                   \
 894                 (einode)->xtime.tv_nsec = 0;                                   \
 895 } while (0)
 896
 897 #define i_disk_version osd1.linux1.l_i_version
 898
 899 #if defined(__KERNEL__) || defined(__linux__)
 900 #define i_reserved1     osd1.linux1.l_i_reserved1
 901 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 902 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 903 #define i_uid_low       i_uid
 904 #define i_gid_low       i_gid
 905 #define i_uid_high      osd2.linux2.l_i_uid_high
 906 #define i_gid_high      osd2.linux2.l_i_gid_high
 907 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 908
 909 #elif defined(__GNU__)
 910
 911 #define i_translator    osd1.hurd1.h_i_translator
 912 #define i_uid_high      osd2.hurd2.h_i_uid_high
 913 #define i_gid_high      osd2.hurd2.h_i_gid_high
 914 #define i_author        osd2.hurd2.h_i_author
 915
 916 #elif defined(__masix__)
 917
 918 #define i_reserved1     osd1.masix1.m_i_reserved1
 919 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 920 #define i_reserved2     osd2.masix2.m_i_reserved2
 921
 922 #endif /* defined(__KERNEL__) || defined(__linux__) */
 923
 924 #include "extents_status.h"
 925
 926 /*
 927  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 928  *
 929  * These are needed to avoid lockdep false positives when we need to
 930  * allocate blocks to the quota inode during ext4_map_blocks(), while
 931  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 932  * do quota tracking for the quota inode, this avoids deadlock (as
 933  * well as infinite recursion, since it isn't turtles all the way
 934  * down...)
 935  *
 936  *  I_DATA_SEM_NORMAL - Used for most inodes
 937  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 938  *                        where the second inode has larger inode number
 939  *                        than the first
 940  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 941  */
 942 enum {
 943         I_DATA_SEM_NORMAL = 0,
 944         I_DATA_SEM_OTHER,
 945         I_DATA_SEM_QUOTA,
 946 };
 947
 948
 949 /*
 950  * fourth extended file system inode data in memory
 951  */
 952 struct ext4_inode_info {
 953         __le32  i_data[15];     /* unconverted */
 954         __u32   i_dtime;
 955         ext4_fsblk_t    i_file_acl;
 956
 957         /*
 958          * i_block_group is the number of the block group which contains
 959          * this file's inode.  Constant across the lifetime of the inode,
 960          * it is used for making block allocation decisions - we try to
 961          * place a file's data blocks near its inode block, and new inodes
 962          * near to their parent directory's inode.
 963          */
 964         ext4_group_t    i_block_group;
 965         ext4_lblk_t     i_dir_start_lookup;
 966 #if (BITS_PER_LONG < 64)
 967         unsigned long   i_state_flags;          /* Dynamic state flags */
 968 #endif
 969         unsigned long   i_flags;
 970
 971         /*
 972          * Extended attributes can be read independently of the main file
 973          * data. Taking i_mutex even when reading would cause contention
 974          * between readers of EAs and writers of regular file data, so
 975          * instead we synchronize on xattr_sem when reading or changing
 976          * EAs.
 977          */
 978         struct rw_semaphore xattr_sem;
 979
 980         struct list_head i_orphan;      /* unlinked but open inodes */
 981
 982         /*
 983          * i_disksize keeps track of what the inode size is ON DISK, not
 984          * in memory.  During truncate, i_size is set to the new size by
 985          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 986          * set i_disksize to 0 until the truncate is actually under way.
 987          *
 988          * The intent is that i_disksize always represents the blocks which
 989          * are used by this file.  This allows recovery to restart truncate
 990          * on orphans if we crash during truncate.  We actually write i_disksize
 991          * into the on-disk inode when writing inodes out, instead of i_size.
 992          *
 993          * The only time when i_disksize and i_size may be different is when
 994          * a truncate is in progress.  The only things which change i_disksize
 995          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 996          */
 997         loff_t  i_disksize;
 998
 999         /*
1000          * i_data_sem is for serialising ext4_truncate() against
1001          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1002          * data tree are chopped off during truncate. We can't do that in
1003          * ext4 because whenever we perform intermediate commits during
1004          * truncate, the inode and all the metadata blocks *must* be in a
1005          * consistent state which allows truncation of the orphans to restart
1006          * during recovery.  Hence we must fix the get_block-vs-truncate race
1007          * by other means, so we have i_data_sem.
1008          */
1009         struct rw_semaphore i_data_sem;
1010         /*
1011          * i_mmap_sem is for serializing page faults with truncate / punch hole
1012          * operations. We have to make sure that new page cannot be faulted in
1013          * a section of the inode that is being punched. We cannot easily use
1014          * i_data_sem for this since we need protection for the whole punch
1015          * operation and i_data_sem ranks below transaction start so we have
1016          * to occasionally drop it.
1017          */
1018         struct rw_semaphore i_mmap_sem;
1019         struct inode vfs_inode;
1020         struct jbd2_inode *jinode;
1021
1022         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1023
1024         /*
1025          * File creation time. Its function is same as that of
1026          * struct timespec64 i_{a,c,m}time in the generic inode.
1027          */
1028         struct timespec64 i_crtime;
1029
1030         /* mballoc */
1031         struct list_head i_prealloc_list;
1032         spinlock_t i_prealloc_lock;
1033
1034         /* extents status tree */
1035         struct ext4_es_tree i_es_tree;
1036         rwlock_t i_es_lock;
1037         struct list_head i_es_list;
1038         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1039         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1040         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1041                                            extents to shrink. Protected by
1042                                            i_es_lock  */
1043
1044         /* ialloc */
1045         ext4_group_t    i_last_alloc_group;
1046
1047         /* allocation reservation info for delalloc */
1048         /* In case of bigalloc, this refer to clusters rather than blocks */
1049         unsigned int i_reserved_data_blocks;
1050         ext4_lblk_t i_da_metadata_calc_last_lblock;
1051         int i_da_metadata_calc_len;
1052
1053         /* pending cluster reservations for bigalloc file systems */
1054         struct ext4_pending_tree i_pending_tree;
1055
1056         /* on-disk additional length */
1057         __u16 i_extra_isize;
1058
1059         /* Indicate the inline data space. */
1060         u16 i_inline_off;
1061         u16 i_inline_size;
1062
1063 #ifdef CONFIG_QUOTA
1064         /* quota space reservation, managed internally by quota code */
1065         qsize_t i_reserved_quota;
1066 #endif
1067
1068         /* Lock protecting lists below */
1069         spinlock_t i_completed_io_lock;
1070         /*
1071          * Completed IOs that need unwritten extents handling and have
1072          * transaction reserved
1073          */
1074         struct list_head i_rsv_conversion_list;
1075         struct work_struct i_rsv_conversion_work;
1076         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1077
1078         spinlock_t i_block_reservation_lock;
1079
1080         /*
1081          * Transactions that contain inode's metadata needed to complete
1082          * fsync and fdatasync, respectively.
1083          */
1084         tid_t i_sync_tid;
1085         tid_t i_datasync_tid;
1086
1087 #ifdef CONFIG_QUOTA
1088         struct dquot *i_dquot[MAXQUOTAS];
1089 #endif
1090
1091         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1092         __u32 i_csum_seed;
1093
1094         kprojid_t i_projid;
1095 };
1096
1097 /*
1098  * File system states
1099  */
1100 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1101 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1102 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1103
1104 /*
1105  * Misc. filesystem flags
1106  */
1107 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1108 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1109 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1110
1111 /*
1112  * Mount flags set via mount options or defaults
1113  */
1114 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1115 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1116 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1117 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1118 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1119 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1120 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1121 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1122 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1123 #ifdef CONFIG_FS_DAX
1124 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1125 #else
1126 #define EXT4_MOUNT_DAX                  0
1127 #endif
1128 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1129 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1130 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1131 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1132 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1133 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1134 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1135 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1136 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1137 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1138 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1139 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1140                                                  * enable enforcement for hidden
1141                                                  * quota files */
1142 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1143                                                   * enforcement for hidden quota
1144                                                   * files */
1145 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1146                                                   * enforcement */
1147 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1148 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1149 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1150 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1151 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1152 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1153 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1154 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1155 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1156
1157 /*
1158  * Mount flags set either automatically (could not be set by mount option)
1159  * based on per file system feature or property or in special cases such as
1160  * distinguishing between explicit mount option definition and default.
1161  */
1162 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1163                                                       specified delalloc */
1164 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1165                                                       size of blocksize * 8
1166                                                       blocks */
1167 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1168                                                       file systems */
1169
1170 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1171                                                 specified journal checksum */
1172
1173 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1174                                                 ~EXT4_MOUNT_##opt
1175 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1176                                                 EXT4_MOUNT_##opt
1177 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1178                                          EXT4_MOUNT_##opt)
1179
1180 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1181                                                 ~EXT4_MOUNT2_##opt
1182 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1183                                                 EXT4_MOUNT2_##opt
1184 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1185                                          EXT4_MOUNT2_##opt)
1186
1187 #define ext4_test_and_set_bit           __test_and_set_bit_le
1188 #define ext4_set_bit                    __set_bit_le
1189 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1190 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1191 #define ext4_clear_bit                  __clear_bit_le
1192 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1193 #define ext4_test_bit                   test_bit_le
1194 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1195 #define ext4_find_next_bit              find_next_bit_le
1196
1197 extern void ext4_set_bits(void *bm, int cur, int len);
1198
1199 /*
1200  * Maximal mount counts between two filesystem checks
1201  */
1202 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1203 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1204
1205 /*
1206  * Behaviour when detecting errors
1207  */
1208 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1209 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1210 #define EXT4_ERRORS_PANIC               3       /* Panic */
1211 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1212
1213 /* Metadata checksum algorithm codes */
1214 #define EXT4_CRC32C_CHKSUM              1
1215
1216 /*
1217  * Structure of the super block
1218  */
1219 struct ext4_super_block {
1220 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1221         __le32  s_blocks_count_lo;      /* Blocks count */
1222         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1223         __le32  s_free_blocks_count_lo; /* Free blocks count */
1224 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1225         __le32  s_first_data_block;     /* First Data Block */
1226         __le32  s_log_block_size;       /* Block size */
1227         __le32  s_log_cluster_size;     /* Allocation cluster size */
1228 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1229         __le32  s_clusters_per_group;   /* # Clusters per group */
1230         __le32  s_inodes_per_group;     /* # Inodes per group */
1231         __le32  s_mtime;                /* Mount time */
1232 /*30*/  __le32  s_wtime;                /* Write time */
1233         __le16  s_mnt_count;            /* Mount count */
1234         __le16  s_max_mnt_count;        /* Maximal mount count */
1235         __le16  s_magic;                /* Magic signature */
1236         __le16  s_state;                /* File system state */
1237         __le16  s_errors;               /* Behaviour when detecting errors */
1238         __le16  s_minor_rev_level;      /* minor revision level */
1239 /*40*/  __le32  s_lastcheck;            /* time of last check */
1240         __le32  s_checkinterval;        /* max. time between checks */
1241         __le32  s_creator_os;           /* OS */
1242         __le32  s_rev_level;            /* Revision level */
1243 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1244         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1245         /*
1246          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1247          *
1248          * Note: the difference between the compatible feature set and
1249          * the incompatible feature set is that if there is a bit set
1250          * in the incompatible feature set that the kernel doesn't
1251          * know about, it should refuse to mount the filesystem.
1252          *
1253          * e2fsck's requirements are more strict; if it doesn't know
1254          * about a feature in either the compatible or incompatible
1255          * feature set, it must abort and not try to meddle with
1256          * things it doesn't understand...
1257          */
1258         __le32  s_first_ino;            /* First non-reserved inode */
1259         __le16  s_inode_size;           /* size of inode structure */
1260         __le16  s_block_group_nr;       /* block group # of this superblock */
1261         __le32  s_feature_compat;       /* compatible feature set */
1262 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1263         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1264 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1265 /*78*/  char    s_volume_name[16];      /* volume name */
1266 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1267 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1268         /*
1269          * Performance hints.  Directory preallocation should only
1270          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1271          */
1272         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1273         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1274         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1275         /*
1276          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1277          */
1278 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1279 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1280         __le32  s_journal_dev;          /* device number of journal file */
1281         __le32  s_last_orphan;          /* start of list of inodes to delete */
1282         __le32  s_hash_seed[4];         /* HTREE hash seed */
1283         __u8    s_def_hash_version;     /* Default hash version to use */
1284         __u8    s_jnl_backup_type;
1285         __le16  s_desc_size;            /* size of group descriptor */
1286 /*100*/ __le32  s_default_mount_opts;
1287         __le32  s_first_meta_bg;        /* First metablock block group */
1288         __le32  s_mkfs_time;            /* When the filesystem was created */
1289         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1290         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1291 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1292         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1293         __le32  s_free_blocks_count_hi; /* Free blocks count */
1294         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1295         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1296         __le32  s_flags;                /* Miscellaneous flags */
1297         __le16  s_raid_stride;          /* RAID stride */
1298         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1299         __le64  s_mmp_block;            /* Block for multi-mount protection */
1300         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1301         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1302         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1303         __u8    s_encryption_level;     /* versioning level for encryption */
1304         __u8    s_reserved_pad;         /* Padding to next 32bits */
1305         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1306         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1307         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1308         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1309                                               snapshot's future use */
1310         __le32  s_snapshot_list;        /* inode number of the head of the
1311                                            on-disk snapshot list */
1312 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1313         __le32  s_error_count;          /* number of fs errors */
1314         __le32  s_first_error_time;     /* first time an error happened */
1315         __le32  s_first_error_ino;      /* inode involved in first error */
1316         __le64  s_first_error_block;    /* block involved of first error */
1317         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1318         __le32  s_first_error_line;     /* line number where error happened */
1319         __le32  s_last_error_time;      /* most recent time of an error */
1320         __le32  s_last_error_ino;       /* inode involved in last error */
1321         __le32  s_last_error_line;      /* line number where error happened */
1322         __le64  s_last_error_block;     /* block involved of last error */
1323         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1324 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1325         __u8    s_mount_opts[64];
1326         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1327         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1328         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1329         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1330         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1331         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1332         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1333         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1334         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1335         __u8    s_wtime_hi;
1336         __u8    s_mtime_hi;
1337         __u8    s_mkfs_time_hi;
1338         __u8    s_lastcheck_hi;
1339         __u8    s_first_error_time_hi;
1340         __u8    s_last_error_time_hi;
1341         __u8    s_pad[2];
1342         __le16  s_encoding;             /* Filename charset encoding */
1343         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1344         __le32  s_reserved[95];         /* Padding to the end of the block */
1345         __le32  s_checksum;             /* crc32c(superblock) */
1346 };
1347
1348 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1349
1350 #ifdef __KERNEL__
1351
1352 /*
1353  * run-time mount flags
1354  */
1355 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1356 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1357 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1358
1359 #ifdef CONFIG_FS_ENCRYPTION
1360 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1361                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1362 #else
1363 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1364 #endif
1365
1366 /* Number of quota types we support */
1367 #define EXT4_MAXQUOTAS 3
1368
1369 #define EXT4_ENC_UTF8_12_1      1
1370
1371 /*
1372  * Flags for ext4_sb_info.s_encoding_flags.
1373  */
1374 #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1375
1376 #define ext4_has_strict_mode(sbi) \
1377         (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1378
1379 /*
1380  * fourth extended-fs super-block data in memory
1381  */
1382 struct ext4_sb_info {
1383         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1384         unsigned long s_inodes_per_block;/* Number of inodes per block */
1385         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1386         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1387         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1388         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1389         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1390         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1391         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1392         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1393         unsigned long s_overhead;  /* # of fs overhead clusters */
1394         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1395         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1396         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1397         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1398         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1399         struct buffer_head **s_group_desc;
1400         unsigned int s_mount_opt;
1401         unsigned int s_mount_opt2;
1402         unsigned int s_mount_flags;
1403         unsigned int s_def_mount_opt;
1404         ext4_fsblk_t s_sb_block;
1405         atomic64_t s_resv_clusters;
1406         kuid_t s_resuid;
1407         kgid_t s_resgid;
1408         unsigned short s_mount_state;
1409         unsigned short s_pad;
1410         int s_addr_per_block_bits;
1411         int s_desc_per_block_bits;
1412         int s_inode_size;
1413         int s_first_ino;
1414         unsigned int s_inode_readahead_blks;
1415         unsigned int s_inode_goal;
1416         u32 s_hash_seed[4];
1417         int s_def_hash_version;
1418         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1419         struct percpu_counter s_freeclusters_counter;
1420         struct percpu_counter s_freeinodes_counter;
1421         struct percpu_counter s_dirs_counter;
1422         struct percpu_counter s_dirtyclusters_counter;
1423         struct blockgroup_lock *s_blockgroup_lock;
1424         struct proc_dir_entry *s_proc;
1425         struct kobject s_kobj;
1426         struct completion s_kobj_unregister;
1427         struct super_block *s_sb;
1428 #ifdef CONFIG_UNICODE
1429         struct unicode_map *s_encoding;
1430         __u16 s_encoding_flags;
1431 #endif
1432
1433         /* Journaling */
1434         struct journal_s *s_journal;
1435         struct list_head s_orphan;
1436         struct mutex s_orphan_lock;
1437         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1438         unsigned long s_commit_interval;
1439         u32 s_max_batch_time;
1440         u32 s_min_batch_time;
1441         struct block_device *journal_bdev;
1442 #ifdef CONFIG_QUOTA
1443         /* Names of quota files with journalled quota */
1444         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1445         int s_jquota_fmt;                       /* Format of quota to use */
1446 #endif
1447         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1448         struct ext4_system_blocks __rcu *system_blks;
1449
1450 #ifdef EXTENTS_STATS
1451         /* ext4 extents stats */
1452         unsigned long s_ext_min;
1453         unsigned long s_ext_max;
1454         unsigned long s_depth_max;
1455         spinlock_t s_ext_stats_lock;
1456         unsigned long s_ext_blocks;
1457         unsigned long s_ext_extents;
1458 #endif
1459
1460         /* for buddy allocator */
1461         struct ext4_group_info ***s_group_info;
1462         struct inode *s_buddy_cache;
1463         spinlock_t s_md_lock;
1464         unsigned short *s_mb_offsets;
1465         unsigned int *s_mb_maxs;
1466         unsigned int s_group_info_size;
1467         unsigned int s_mb_free_pending;
1468         struct list_head s_freed_data_list;     /* List of blocks to be freed
1469                                                    after commit completed */
1470
1471         /* tunables */
1472         unsigned long s_stripe;
1473         unsigned int s_mb_stream_request;
1474         unsigned int s_mb_max_to_scan;
1475         unsigned int s_mb_min_to_scan;
1476         unsigned int s_mb_stats;
1477         unsigned int s_mb_order2_reqs;
1478         unsigned int s_mb_group_prealloc;
1479         unsigned int s_max_dir_size_kb;
1480         /* where last allocation was done - for stream allocation */
1481         unsigned long s_mb_last_group;
1482         unsigned long s_mb_last_start;
1483
1484         /* stats for buddy allocator */
1485         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1486         atomic_t s_bal_success; /* we found long enough chunks */
1487         atomic_t s_bal_allocated;       /* in blocks */
1488         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1489         atomic_t s_bal_goals;   /* goal hits */
1490         atomic_t s_bal_breaks;  /* too long searches */
1491         atomic_t s_bal_2orders; /* 2^order hits */
1492         spinlock_t s_bal_lock;
1493         unsigned long s_mb_buddies_generated;
1494         unsigned long long s_mb_generation_time;
1495         atomic_t s_mb_lost_chunks;
1496         atomic_t s_mb_preallocated;
1497         atomic_t s_mb_discarded;
1498         atomic_t s_lock_busy;
1499
1500         /* locality groups */
1501         struct ext4_locality_group __percpu *s_locality_groups;
1502
1503         /* for write statistics */
1504         unsigned long s_sectors_written_start;
1505         u64 s_kbytes_written;
1506
1507         /* the size of zero-out chunk */
1508         unsigned int s_extent_max_zeroout_kb;
1509
1510         unsigned int s_log_groups_per_flex;
1511         struct flex_groups *s_flex_groups;
1512         ext4_group_t s_flex_groups_allocated;
1513
1514         /* workqueue for reserved extent conversions (buffered io) */
1515         struct workqueue_struct *rsv_conversion_wq;
1516
1517         /* timer for periodic error stats printing */
1518         struct timer_list s_err_report;
1519
1520         /* Lazy inode table initialization info */
1521         struct ext4_li_request *s_li_request;
1522         /* Wait multiplier for lazy initialization thread */
1523         unsigned int s_li_wait_mult;
1524
1525         /* Kernel thread for multiple mount protection */
1526         struct task_struct *s_mmp_tsk;
1527
1528         /* record the last minlen when FITRIM is called. */
1529         atomic_t s_last_trim_minblks;
1530
1531         /* Reference to checksum algorithm driver via cryptoapi */
1532         struct crypto_shash *s_chksum_driver;
1533
1534         /* Precomputed FS UUID checksum for seeding other checksums */
1535         __u32 s_csum_seed;
1536
1537         /* Reclaim extents from extent status tree */
1538         struct shrinker s_es_shrinker;
1539         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1540         long s_es_nr_inode;
1541         struct ext4_es_stats s_es_stats;
1542         struct mb_cache *s_ea_block_cache;
1543         struct mb_cache *s_ea_inode_cache;
1544         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1545
1546         /* Ratelimit ext4 messages. */
1547         struct ratelimit_state s_err_ratelimit_state;
1548         struct ratelimit_state s_warning_ratelimit_state;
1549         struct ratelimit_state s_msg_ratelimit_state;
1550
1551         /* Barrier between changing inodes' journal flags and writepages ops. */
1552         struct percpu_rw_semaphore s_journal_flag_rwsem;
1553         struct dax_device *s_daxdev;
1554 };
1555
1556 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1557 {
1558         return sb->s_fs_info;
1559 }
1560 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1561 {
1562         return container_of(inode, struct ext4_inode_info, vfs_inode);
1563 }
1564
1565 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1566 {
1567         return ino == EXT4_ROOT_INO ||
1568                 (ino >= EXT4_FIRST_INO(sb) &&
1569                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1570 }
1571
1572 /*
1573  * Inode dynamic state flags
1574  */
1575 enum {
1576         EXT4_STATE_JDATA,               /* journaled data exists */
1577         EXT4_STATE_NEW,                 /* inode is newly created */
1578         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1579         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1580         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1581         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1582         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1583         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1584         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1585         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1586         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1587         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1588 };
1589
1590 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1591 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1592 {                                                                       \
1593         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1594 }                                                                       \
1595 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1596 {                                                                       \
1597         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1598 }                                                                       \
1599 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1600 {                                                                       \
1601         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1602 }
1603
1604 /* Add these declarations here only so that these functions can be
1605  * found by name.  Otherwise, they are very hard to locate. */
1606 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1607 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1608 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1609 EXT4_INODE_BIT_FNS(flag, flags, 0)
1610
1611 /* Add these declarations here only so that these functions can be
1612  * found by name.  Otherwise, they are very hard to locate. */
1613 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1614 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1615 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1616 #if (BITS_PER_LONG < 64)
1617 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1618
1619 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1620 {
1621         (ei)->i_state_flags = 0;
1622 }
1623 #else
1624 EXT4_INODE_BIT_FNS(state, flags, 32)
1625
1626 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1627 {
1628         /* We depend on the fact that callers will set i_flags */
1629 }
1630 #endif
1631 #else
1632 /* Assume that user mode programs are passing in an ext4fs superblock, not
1633  * a kernel struct super_block.  This will allow us to call the feature-test
1634  * macros from user land. */
1635 #define EXT4_SB(sb)     (sb)
1636 #endif
1637
1638 static inline bool ext4_verity_in_progress(struct inode *inode)
1639 {
1640         return IS_ENABLED(CONFIG_FS_VERITY) &&
1641                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1642 }
1643
1644 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1645
1646 /*
1647  * Codes for operating systems
1648  */
1649 #define EXT4_OS_LINUX           0
1650 #define EXT4_OS_HURD            1
1651 #define EXT4_OS_MASIX           2
1652 #define EXT4_OS_FREEBSD         3
1653 #define EXT4_OS_LITES           4
1654
1655 /*
1656  * Revision levels
1657  */
1658 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1659 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1660
1661 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1662 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1663
1664 #define EXT4_GOOD_OLD_INODE_SIZE 128
1665
1666 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1667 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1668 #define EXT4_TIMESTAMP_MIN              S32_MIN
1669
1670 /*
1671  * Feature set definitions
1672  */
1673
1674 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1675 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1676 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1677 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1678 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1679 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1680 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1681
1682 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1683 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1684 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1685 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1686 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1687 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1688 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1689 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1690 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1691 /*
1692  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1693  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1694  * all other data structures' checksums.  However, the METADATA_CSUM and
1695  * GDT_CSUM bits are mutually exclusive.
1696  */
1697 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1698 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1699 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1700 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
1701
1702 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1703 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1704 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1705 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1706 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1707 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1708 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1709 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1710 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1711 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1712 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1713 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1714 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1715 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1716 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1717 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1718
1719 extern void ext4_update_dynamic_rev(struct super_block *sb);
1720
1721 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1722 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1723 { \
1724         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1725                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1726 } \
1727 static inline void ext4_set_feature_##name(struct super_block *sb) \
1728 { \
1729         ext4_update_dynamic_rev(sb); \
1730         EXT4_SB(sb)->s_es->s_feature_compat |= \
1731                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1732 } \
1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1734 { \
1735         EXT4_SB(sb)->s_es->s_feature_compat &= \
1736                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1737 }
1738
1739 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1740 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1741 { \
1742         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1743                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1744 } \
1745 static inline void ext4_set_feature_##name(struct super_block *sb) \
1746 { \
1747         ext4_update_dynamic_rev(sb); \
1748         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1749                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1750 } \
1751 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1752 { \
1753         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1754                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1755 }
1756
1757 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1758 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1759 { \
1760         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1761                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1762 } \
1763 static inline void ext4_set_feature_##name(struct super_block *sb) \
1764 { \
1765         ext4_update_dynamic_rev(sb); \
1766         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1767                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1768 } \
1769 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1770 { \
1771         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1772                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1773 }
1774
1775 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1776 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1777 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1778 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1779 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1780 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1781 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1782
1783 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1784 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1785 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1786 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1787 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1788 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1789 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1790 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1791 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1792 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1793 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1794 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1795 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
1796
1797 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1798 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1799 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1800 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1801 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1802 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1803 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1804 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1805 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1806 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1807 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1808 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1809 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1810 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1811 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1812 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
1813
1814 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1815 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1816                                          EXT4_FEATURE_INCOMPAT_META_BG)
1817 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1818                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1819                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1820
1821 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1822 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1823                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1824                                          EXT4_FEATURE_INCOMPAT_META_BG)
1825 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1826                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1827                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1828
1829 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1830 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1831                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1832                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1833                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1834                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1835                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1836                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1837                                          EXT4_FEATURE_INCOMPAT_MMP | \
1838                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1839                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1840                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1841                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1842                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1843 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1844                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1845                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1846                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1847                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1848                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1849                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1850                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1851                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1852                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1853                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
1854                                          EXT4_FEATURE_RO_COMPAT_VERITY)
1855
1856 #define EXTN_FEATURE_FUNCS(ver) \
1857 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1858 { \
1859         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1860                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1861 } \
1862 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1863 { \
1864         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1865                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1866 } \
1867 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1868 { \
1869         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1870                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1871 }
1872
1873 EXTN_FEATURE_FUNCS(2)
1874 EXTN_FEATURE_FUNCS(3)
1875 EXTN_FEATURE_FUNCS(4)
1876
1877 static inline bool ext4_has_compat_features(struct super_block *sb)
1878 {
1879         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1880 }
1881 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1882 {
1883         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1884 }
1885 static inline bool ext4_has_incompat_features(struct super_block *sb)
1886 {
1887         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1888 }
1889
1890 /*
1891  * Superblock flags
1892  */
1893 #define EXT4_FLAGS_RESIZING     0
1894 #define EXT4_FLAGS_SHUTDOWN     1
1895
1896 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1897 {
1898         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1899 }
1900
1901
1902 /*
1903  * Default values for user and/or group using reserved blocks
1904  */
1905 #define EXT4_DEF_RESUID         0
1906 #define EXT4_DEF_RESGID         0
1907
1908 /*
1909  * Default project ID
1910  */
1911 #define EXT4_DEF_PROJID         0
1912
1913 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1914
1915 /*
1916  * Default mount options
1917  */
1918 #define EXT4_DEFM_DEBUG         0x0001
1919 #define EXT4_DEFM_BSDGROUPS     0x0002
1920 #define EXT4_DEFM_XATTR_USER    0x0004
1921 #define EXT4_DEFM_ACL           0x0008
1922 #define EXT4_DEFM_UID16         0x0010
1923 #define EXT4_DEFM_JMODE         0x0060
1924 #define EXT4_DEFM_JMODE_DATA    0x0020
1925 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1926 #define EXT4_DEFM_JMODE_WBACK   0x0060
1927 #define EXT4_DEFM_NOBARRIER     0x0100
1928 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1929 #define EXT4_DEFM_DISCARD       0x0400
1930 #define EXT4_DEFM_NODELALLOC    0x0800
1931
1932 /*
1933  * Default journal batch times
1934  */
1935 #define EXT4_DEF_MIN_BATCH_TIME 0
1936 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1937
1938 /*
1939  * Minimum number of groups in a flexgroup before we separate out
1940  * directories into the first block group of a flexgroup
1941  */
1942 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1943
1944 /*
1945  * Structure of a directory entry
1946  */
1947 #define EXT4_NAME_LEN 255
1948
1949 struct ext4_dir_entry {
1950         __le32  inode;                  /* Inode number */
1951         __le16  rec_len;                /* Directory entry length */
1952         __le16  name_len;               /* Name length */
1953         char    name[EXT4_NAME_LEN];    /* File name */
1954 };
1955
1956 /*
1957  * The new version of the directory entry.  Since EXT4 structures are
1958  * stored in intel byte order, and the name_len field could never be
1959  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1960  * file_type field.
1961  */
1962 struct ext4_dir_entry_2 {
1963         __le32  inode;                  /* Inode number */
1964         __le16  rec_len;                /* Directory entry length */
1965         __u8    name_len;               /* Name length */
1966         __u8    file_type;
1967         char    name[EXT4_NAME_LEN];    /* File name */
1968 };
1969
1970 /*
1971  * This is a bogus directory entry at the end of each leaf block that
1972  * records checksums.
1973  */
1974 struct ext4_dir_entry_tail {
1975         __le32  det_reserved_zero1;     /* Pretend to be unused */
1976         __le16  det_rec_len;            /* 12 */
1977         __u8    det_reserved_zero2;     /* Zero name length */
1978         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1979         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1980 };
1981
1982 #define EXT4_DIRENT_TAIL(block, blocksize) \
1983         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1984                                         ((blocksize) - \
1985                                          sizeof(struct ext4_dir_entry_tail))))
1986
1987 /*
1988  * Ext4 directory file types.  Only the low 3 bits are used.  The
1989  * other bits are reserved for now.
1990  */
1991 #define EXT4_FT_UNKNOWN         0
1992 #define EXT4_FT_REG_FILE        1
1993 #define EXT4_FT_DIR             2
1994 #define EXT4_FT_CHRDEV          3
1995 #define EXT4_FT_BLKDEV          4
1996 #define EXT4_FT_FIFO            5
1997 #define EXT4_FT_SOCK            6
1998 #define EXT4_FT_SYMLINK         7
1999
2000 #define EXT4_FT_MAX             8
2001
2002 #define EXT4_FT_DIR_CSUM        0xDE
2003
2004 /*
2005  * EXT4_DIR_PAD defines the directory entries boundaries
2006  *
2007  * NOTE: It must be a multiple of 4
2008  */
2009 #define EXT4_DIR_PAD                    4
2010 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2011 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
2012                                          ~EXT4_DIR_ROUND)
2013 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2014
2015 /*
2016  * If we ever get support for fs block sizes > page_size, we'll need
2017  * to remove the #if statements in the next two functions...
2018  */
2019 static inline unsigned int
2020 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2021 {
2022         unsigned len = le16_to_cpu(dlen);
2023
2024 #if (PAGE_SIZE >= 65536)
2025         if (len == EXT4_MAX_REC_LEN || len == 0)
2026                 return blocksize;
2027         return (len & 65532) | ((len & 3) << 16);
2028 #else
2029         return len;
2030 #endif
2031 }
2032
2033 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2034 {
2035         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2036                 BUG();
2037 #if (PAGE_SIZE >= 65536)
2038         if (len < 65536)
2039                 return cpu_to_le16(len);
2040         if (len == blocksize) {
2041                 if (blocksize == 65536)
2042                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2043                 else
2044                         return cpu_to_le16(0);
2045         }
2046         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2047 #else
2048         return cpu_to_le16(len);
2049 #endif
2050 }
2051
2052 /*
2053  * Hash Tree Directory indexing
2054  * (c) Daniel Phillips, 2001
2055  */
2056
2057 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2058                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2059 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2060                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2061 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2062
2063 /* Legal values for the dx_root hash_version field: */
2064
2065 #define DX_HASH_LEGACY                  0
2066 #define DX_HASH_HALF_MD4                1
2067 #define DX_HASH_TEA                     2
2068 #define DX_HASH_LEGACY_UNSIGNED         3
2069 #define DX_HASH_HALF_MD4_UNSIGNED       4
2070 #define DX_HASH_TEA_UNSIGNED            5
2071
2072 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2073                               const void *address, unsigned int length)
2074 {
2075         struct {
2076                 struct shash_desc shash;
2077                 char ctx[4];
2078         } desc;
2079
2080         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2081
2082         desc.shash.tfm = sbi->s_chksum_driver;
2083         *(u32 *)desc.ctx = crc;
2084
2085         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2086
2087         return *(u32 *)desc.ctx;
2088 }
2089
2090 #ifdef __KERNEL__
2091
2092 /* hash info structure used by the directory hash */
2093 struct dx_hash_info
2094 {
2095         u32             hash;
2096         u32             minor_hash;
2097         int             hash_version;
2098         u32             *seed;
2099 };
2100
2101
2102 /* 32 and 64 bit signed EOF for dx directories */
2103 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2104 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2105
2106
2107 /*
2108  * Control parameters used by ext4_htree_next_block
2109  */
2110 #define HASH_NB_ALWAYS          1
2111
2112 struct ext4_filename {
2113         const struct qstr *usr_fname;
2114         struct fscrypt_str disk_name;
2115         struct dx_hash_info hinfo;
2116 #ifdef CONFIG_FS_ENCRYPTION
2117         struct fscrypt_str crypto_buf;
2118 #endif
2119 #ifdef CONFIG_UNICODE
2120         struct fscrypt_str cf_name;
2121 #endif
2122 };
2123
2124 #define fname_name(p) ((p)->disk_name.name)
2125 #define fname_len(p)  ((p)->disk_name.len)
2126
2127 /*
2128  * Describe an inode's exact location on disk and in memory
2129  */
2130 struct ext4_iloc
2131 {
2132         struct buffer_head *bh;
2133         unsigned long offset;
2134         ext4_group_t block_group;
2135 };
2136
2137 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2138 {
2139         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2140 }
2141
2142 static inline bool ext4_is_quota_file(struct inode *inode)
2143 {
2144         return IS_NOQUOTA(inode) &&
2145                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2146 }
2147
2148 /*
2149  * This structure is stuffed into the struct file's private_data field
2150  * for directories.  It is where we put information so that we can do
2151  * readdir operations in hash tree order.
2152  */
2153 struct dir_private_info {
2154         struct rb_root  root;
2155         struct rb_node  *curr_node;
2156         struct fname    *extra_fname;
2157         loff_t          last_pos;
2158         __u32           curr_hash;
2159         __u32           curr_minor_hash;
2160         __u32           next_hash;
2161 };
2162
2163 /* calculate the first block number of the group */
2164 static inline ext4_fsblk_t
2165 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2166 {
2167         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2168                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2169 }
2170
2171 /*
2172  * Special error return code only used by dx_probe() and its callers.
2173  */
2174 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2175
2176 /* htree levels for ext4 */
2177 #define EXT4_HTREE_LEVEL_COMPAT 2
2178 #define EXT4_HTREE_LEVEL        3
2179
2180 static inline int ext4_dir_htree_level(struct super_block *sb)
2181 {
2182         return ext4_has_feature_largedir(sb) ?
2183                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2184 }
2185
2186 /*
2187  * Timeout and state flag for lazy initialization inode thread.
2188  */
2189 #define EXT4_DEF_LI_WAIT_MULT                   10
2190 #define EXT4_DEF_LI_MAX_START_DELAY             5
2191 #define EXT4_LAZYINIT_QUIT                      0x0001
2192 #define EXT4_LAZYINIT_RUNNING                   0x0002
2193
2194 /*
2195  * Lazy inode table initialization info
2196  */
2197 struct ext4_lazy_init {
2198         unsigned long           li_state;
2199         struct list_head        li_request_list;
2200         struct mutex            li_list_mtx;
2201 };
2202
2203 struct ext4_li_request {
2204         struct super_block      *lr_super;
2205         struct ext4_sb_info     *lr_sbi;
2206         ext4_group_t            lr_next_group;
2207         struct list_head        lr_request;
2208         unsigned long           lr_next_sched;
2209         unsigned long           lr_timeout;
2210 };
2211
2212 struct ext4_features {
2213         struct kobject f_kobj;
2214         struct completion f_kobj_unregister;
2215 };
2216
2217 /*
2218  * This structure will be used for multiple mount protection. It will be
2219  * written into the block number saved in the s_mmp_block field in the
2220  * superblock. Programs that check MMP should assume that if
2221  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2222  * to use the filesystem, regardless of how old the timestamp is.
2223  */
2224 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2225 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2226 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2227 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2228
2229 struct mmp_struct {
2230         __le32  mmp_magic;              /* Magic number for MMP */
2231         __le32  mmp_seq;                /* Sequence no. updated periodically */
2232
2233         /*
2234          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2235          * purposes and do not affect the correctness of the algorithm
2236          */
2237         __le64  mmp_time;               /* Time last updated */
2238         char    mmp_nodename[64];       /* Node which last updated MMP block */
2239         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2240
2241         /*
2242          * mmp_check_interval is used to verify if the MMP block has been
2243          * updated on the block device. The value is updated based on the
2244          * maximum time to write the MMP block during an update cycle.
2245          */
2246         __le16  mmp_check_interval;
2247
2248         __le16  mmp_pad1;
2249         __le32  mmp_pad2[226];
2250         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2251 };
2252
2253 /* arguments passed to the mmp thread */
2254 struct mmpd_data {
2255         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2256         struct super_block *sb;  /* super block of the fs */
2257 };
2258
2259 /*
2260  * Check interval multiplier
2261  * The MMP block is written every update interval and initially checked every
2262  * update interval x the multiplier (the value is then adapted based on the
2263  * write latency). The reason is that writes can be delayed under load and we
2264  * don't want readers to incorrectly assume that the filesystem is no longer
2265  * in use.
2266  */
2267 #define EXT4_MMP_CHECK_MULT             2UL
2268
2269 /*
2270  * Minimum interval for MMP checking in seconds.
2271  */
2272 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2273
2274 /*
2275  * Maximum interval for MMP checking in seconds.
2276  */
2277 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2278
2279 /*
2280  * Function prototypes
2281  */
2282
2283 /*
2284  * Ok, these declarations are also in <linux/kernel.h> but none of the
2285  * ext4 source programs needs to include it so they are duplicated here.
2286  */
2287 # define NORET_TYPE     /**/
2288 # define ATTRIB_NORET   __attribute__((noreturn))
2289 # define NORET_AND      noreturn,
2290
2291 /* bitmap.c */
2292 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2293 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2294                                 struct ext4_group_desc *gdp,
2295                                 struct buffer_head *bh, int sz);
2296 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2297                                   struct ext4_group_desc *gdp,
2298                                   struct buffer_head *bh, int sz);
2299 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2300                                 struct ext4_group_desc *gdp,
2301                                 struct buffer_head *bh);
2302 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2303                                   struct ext4_group_desc *gdp,
2304                                   struct buffer_head *bh);
2305
2306 /* balloc.c */
2307 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2308                                          ext4_fsblk_t blocknr,
2309                                          ext4_group_t *blockgrpp,
2310                                          ext4_grpblk_t *offsetp);
2311 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2312                                           ext4_fsblk_t block);
2313
2314 extern unsigned int ext4_block_group(struct super_block *sb,
2315                         ext4_fsblk_t blocknr);
2316 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2317                         ext4_fsblk_t blocknr);
2318 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2319 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2320                         ext4_group_t group);
2321 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2322                                          ext4_fsblk_t goal,
2323                                          unsigned int flags,
2324                                          unsigned long *count,
2325                                          int *errp);
2326 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2327                                     s64 nclusters, unsigned int flags);
2328 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2329 extern void ext4_check_blocks_bitmap(struct super_block *);
2330 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2331                                                     ext4_group_t block_group,
2332                                                     struct buffer_head ** bh);
2333 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2334
2335 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2336                                                 ext4_group_t block_group);
2337 extern int ext4_wait_block_bitmap(struct super_block *sb,
2338                                   ext4_group_t block_group,
2339                                   struct buffer_head *bh);
2340 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2341                                                   ext4_group_t block_group);
2342 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2343                                               ext4_group_t block_group,
2344                                               struct ext4_group_desc *gdp);
2345 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2346
2347 #ifdef CONFIG_UNICODE
2348 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2349                                          const struct qstr *iname,
2350                                          struct fscrypt_str *fname);
2351 #endif
2352
2353 #ifdef CONFIG_FS_ENCRYPTION
2354 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2355                                                 const struct fscrypt_name *src)
2356 {
2357         memset(dst, 0, sizeof(*dst));
2358
2359         dst->usr_fname = src->usr_fname;
2360         dst->disk_name = src->disk_name;
2361         dst->hinfo.hash = src->hash;
2362         dst->hinfo.minor_hash = src->minor_hash;
2363         dst->crypto_buf = src->crypto_buf;
2364 }
2365
2366 static inline int ext4_fname_setup_filename(struct inode *dir,
2367                                             const struct qstr *iname,
2368                                             int lookup,
2369                                             struct ext4_filename *fname)
2370 {
2371         struct fscrypt_name name;
2372         int err;
2373
2374         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2375         if (err)
2376                 return err;
2377
2378         ext4_fname_from_fscrypt_name(fname, &name);
2379
2380 #ifdef CONFIG_UNICODE
2381         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2382 #endif
2383         return 0;
2384 }
2385
2386 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2387                                             struct dentry *dentry,
2388                                             struct ext4_filename *fname)
2389 {
2390         struct fscrypt_name name;
2391         int err;
2392
2393         err = fscrypt_prepare_lookup(dir, dentry, &name);
2394         if (err)
2395                 return err;
2396
2397         ext4_fname_from_fscrypt_name(fname, &name);
2398
2399 #ifdef CONFIG_UNICODE
2400         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2401 #endif
2402         return 0;
2403 }
2404
2405 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2406 {
2407         struct fscrypt_name name;
2408
2409         name.crypto_buf = fname->crypto_buf;
2410         fscrypt_free_filename(&name);
2411
2412         fname->crypto_buf.name = NULL;
2413         fname->usr_fname = NULL;
2414         fname->disk_name.name = NULL;
2415
2416 #ifdef CONFIG_UNICODE
2417         kfree(fname->cf_name.name);
2418         fname->cf_name.name = NULL;
2419 #endif
2420 }
2421 #else /* !CONFIG_FS_ENCRYPTION */
2422 static inline int ext4_fname_setup_filename(struct inode *dir,
2423                                             const struct qstr *iname,
2424                                             int lookup,
2425                                             struct ext4_filename *fname)
2426 {
2427         fname->usr_fname = iname;
2428         fname->disk_name.name = (unsigned char *) iname->name;
2429         fname->disk_name.len = iname->len;
2430
2431 #ifdef CONFIG_UNICODE
2432         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2433 #endif
2434
2435         return 0;
2436 }
2437
2438 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2439                                             struct dentry *dentry,
2440                                             struct ext4_filename *fname)
2441 {
2442         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2443 }
2444
2445 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2446 {
2447 #ifdef CONFIG_UNICODE
2448         kfree(fname->cf_name.name);
2449         fname->cf_name.name = NULL;
2450 #endif
2451 }
2452 #endif /* !CONFIG_FS_ENCRYPTION */
2453
2454 /* dir.c */
2455 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2456                                   struct file *,
2457                                   struct ext4_dir_entry_2 *,
2458                                   struct buffer_head *, char *, int,
2459                                   unsigned int);
2460 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2461         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2462                                         (de), (bh), (buf), (size), (offset)))
2463 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2464                                 __u32 minor_hash,
2465                                 struct ext4_dir_entry_2 *dirent,
2466                                 struct fscrypt_str *ent_name);
2467 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2468 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2469                              struct buffer_head *bh,
2470                              void *buf, int buf_size,
2471                              struct ext4_filename *fname,
2472                              struct ext4_dir_entry_2 **dest_de);
2473 void ext4_insert_dentry(struct inode *inode,
2474                         struct ext4_dir_entry_2 *de,
2475                         int buf_size,
2476                         struct ext4_filename *fname);
2477 static inline void ext4_update_dx_flag(struct inode *inode)
2478 {
2479         if (!ext4_has_feature_dir_index(inode->i_sb))
2480                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2481 }
2482 static const unsigned char ext4_filetype_table[] = {
2483         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2484 };
2485
2486 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2487 {
2488         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2489                 return DT_UNKNOWN;
2490
2491         return ext4_filetype_table[filetype];
2492 }
2493 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2494                              void *buf, int buf_size);
2495
2496 /* fsync.c */
2497 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2498
2499 /* hash.c */
2500 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2501                           struct dx_hash_info *hinfo);
2502
2503 /* ialloc.c */
2504 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2505                                       const struct qstr *qstr, __u32 goal,
2506                                       uid_t *owner, __u32 i_flags,
2507                                       int handle_type, unsigned int line_no,
2508                                       int nblocks);
2509
2510 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2511         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2512                          i_flags, 0, 0, 0)
2513 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2514                                     type, nblocks)                  \
2515         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2516                          0, (type), __LINE__, (nblocks))
2517
2518
2519 extern void ext4_free_inode(handle_t *, struct inode *);
2520 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2521 extern unsigned long ext4_count_free_inodes(struct super_block *);
2522 extern unsigned long ext4_count_dirs(struct super_block *);
2523 extern void ext4_check_inodes_bitmap(struct super_block *);
2524 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2525 extern int ext4_init_inode_table(struct super_block *sb,
2526                                  ext4_group_t group, int barrier);
2527 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2528
2529 /* mballoc.c */
2530 extern const struct seq_operations ext4_mb_seq_groups_ops;
2531 extern long ext4_mb_stats;
2532 extern long ext4_mb_max_to_scan;
2533 extern int ext4_mb_init(struct super_block *);
2534 extern int ext4_mb_release(struct super_block *);
2535 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2536                                 struct ext4_allocation_request *, int *);
2537 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2538 extern void ext4_discard_preallocations(struct inode *);
2539 extern int __init ext4_init_mballoc(void);
2540 extern void ext4_exit_mballoc(void);
2541 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2542                              struct buffer_head *bh, ext4_fsblk_t block,
2543                              unsigned long count, int flags);
2544 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2545                                    ext4_group_t ngroups);
2546 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2547                 ext4_group_t i, struct ext4_group_desc *desc);
2548 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2549                                 ext4_fsblk_t block, unsigned long count);
2550 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2551 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2552
2553 /* inode.c */
2554 int ext4_inode_is_fast_symlink(struct inode *inode);
2555 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2556 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2557 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2558                      bool wait, struct buffer_head **bhs);
2559 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2560                              struct buffer_head *bh_result, int create);
2561 int ext4_get_block(struct inode *inode, sector_t iblock,
2562                    struct buffer_head *bh_result, int create);
2563 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2564                        struct buffer_head *bh_result, int create);
2565 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2566                            struct buffer_head *bh, int create);
2567 int ext4_walk_page_buffers(handle_t *handle,
2568                            struct buffer_head *head,
2569                            unsigned from,
2570                            unsigned to,
2571                            int *partial,
2572                            int (*fn)(handle_t *handle,
2573                                      struct buffer_head *bh));
2574 int do_journal_get_write_access(handle_t *handle,
2575                                 struct buffer_head *bh);
2576 #define FALL_BACK_TO_NONDELALLOC 1
2577 #define CONVERT_INLINE_DATA      2
2578
2579 typedef enum {
2580         EXT4_IGET_NORMAL =      0,
2581         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2582         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2583 } ext4_iget_flags;
2584
2585 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2586                                  ext4_iget_flags flags, const char *function,
2587                                  unsigned int line);
2588
2589 #define ext4_iget(sb, ino, flags) \
2590         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2591
2592 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2593 extern int  ext4_setattr(struct dentry *, struct iattr *);
2594 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2595 extern void ext4_evict_inode(struct inode *);
2596 extern void ext4_clear_inode(struct inode *);
2597 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2598 extern int  ext4_sync_inode(handle_t *, struct inode *);
2599 extern void ext4_dirty_inode(struct inode *, int);
2600 extern int ext4_change_inode_journal_flag(struct inode *, int);
2601 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2602 extern int ext4_inode_attach_jinode(struct inode *inode);
2603 extern int ext4_can_truncate(struct inode *inode);
2604 extern int ext4_truncate(struct inode *);
2605 extern int ext4_break_layouts(struct inode *);
2606 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2607 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2608 extern void ext4_set_inode_flags(struct inode *);
2609 extern int ext4_alloc_da_blocks(struct inode *inode);
2610 extern void ext4_set_aops(struct inode *inode);
2611 extern int ext4_writepage_trans_blocks(struct inode *);
2612 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2613 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2614                              loff_t lstart, loff_t lend);
2615 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2616 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2617 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2618 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2619 extern void ext4_da_release_space(struct inode *inode, int to_free);
2620 extern void ext4_da_update_reserve_space(struct inode *inode,
2621                                         int used, int quota_claim);
2622 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2623                               ext4_fsblk_t pblk, ext4_lblk_t len);
2624
2625 /* indirect.c */
2626 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2627                                 struct ext4_map_blocks *map, int flags);
2628 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2629 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2630 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2631 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2632                                  ext4_lblk_t start, ext4_lblk_t end);
2633
2634 /* ioctl.c */
2635 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2636 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2637
2638 /* migrate.c */
2639 extern int ext4_ext_migrate(struct inode *);
2640 extern int ext4_ind_migrate(struct inode *inode);
2641
2642 /* namei.c */
2643 extern int ext4_dirblock_csum_verify(struct inode *inode,
2644                                      struct buffer_head *bh);
2645 extern int ext4_orphan_add(handle_t *, struct inode *);
2646 extern int ext4_orphan_del(handle_t *, struct inode *);
2647 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2648                                 __u32 start_minor_hash, __u32 *next_hash);
2649 extern int ext4_search_dir(struct buffer_head *bh,
2650                            char *search_buf,
2651                            int buf_size,
2652                            struct inode *dir,
2653                            struct ext4_filename *fname,
2654                            unsigned int offset,
2655                            struct ext4_dir_entry_2 **res_dir);
2656 extern int ext4_generic_delete_entry(handle_t *handle,
2657                                      struct inode *dir,
2658                                      struct ext4_dir_entry_2 *de_del,
2659                                      struct buffer_head *bh,
2660                                      void *entry_buf,
2661                                      int buf_size,
2662                                      int csum_size);
2663 extern bool ext4_empty_dir(struct inode *inode);
2664
2665 /* resize.c */
2666 extern int ext4_group_add(struct super_block *sb,
2667                                 struct ext4_new_group_data *input);
2668 extern int ext4_group_extend(struct super_block *sb,
2669                                 struct ext4_super_block *es,
2670                                 ext4_fsblk_t n_blocks_count);
2671 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2672
2673 /* super.c */
2674 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2675                                          sector_t block, int op_flags);
2676 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2677 extern int ext4_calculate_overhead(struct super_block *sb);
2678 extern void ext4_superblock_csum_set(struct super_block *sb);
2679 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2680 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2681 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2682                                     ext4_group_t ngroup);
2683 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2684                                      char nbuf[16]);
2685 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2686                                              ext4_group_t block_group,
2687                                              unsigned int flags);
2688
2689 extern __printf(4, 5)
2690 void __ext4_error(struct super_block *, const char *, unsigned int,
2691                   const char *, ...);
2692 extern __printf(5, 6)
2693 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2694                       const char *, ...);
2695 extern __printf(5, 6)
2696 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2697                      const char *, ...);
2698 extern void __ext4_std_error(struct super_block *, const char *,
2699                              unsigned int, int);
2700 extern __printf(4, 5)
2701 void __ext4_abort(struct super_block *, const char *, unsigned int,
2702                   const char *, ...);
2703 extern __printf(4, 5)
2704 void __ext4_warning(struct super_block *, const char *, unsigned int,
2705                     const char *, ...);
2706 extern __printf(4, 5)
2707 void __ext4_warning_inode(const struct inode *inode, const char *function,
2708                           unsigned int line, const char *fmt, ...);
2709 extern __printf(3, 4)
2710 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2711 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2712                            const char *, unsigned int, const char *);
2713 extern __printf(7, 8)
2714 void __ext4_grp_locked_error(const char *, unsigned int,
2715                              struct super_block *, ext4_group_t,
2716                              unsigned long, ext4_fsblk_t,
2717                              const char *, ...);
2718
2719 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2720         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2721
2722 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2723         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2724
2725 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2726         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2727
2728 #ifdef CONFIG_PRINTK
2729
2730 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2731         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2732 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2733         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2734 #define ext4_error(sb, fmt, ...)                                        \
2735         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2736 #define ext4_abort(sb, fmt, ...)                                        \
2737         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2738 #define ext4_warning(sb, fmt, ...)                                      \
2739         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2740 #define ext4_warning_inode(inode, fmt, ...)                             \
2741         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2742 #define ext4_msg(sb, level, fmt, ...)                           \
2743         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2744 #define dump_mmp_msg(sb, mmp, msg)                                      \
2745         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2746 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2747         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2748                                 fmt, ##__VA_ARGS__)
2749
2750 #else
2751
2752 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2753 do {                                                                    \
2754         no_printk(fmt, ##__VA_ARGS__);                                  \
2755         __ext4_error_inode(inode, "", 0, block, " ");                   \
2756 } while (0)
2757 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2758 do {                                                                    \
2759         no_printk(fmt, ##__VA_ARGS__);                                  \
2760         __ext4_error_file(file, "", 0, block, " ");                     \
2761 } while (0)
2762 #define ext4_error(sb, fmt, ...)                                        \
2763 do {                                                                    \
2764         no_printk(fmt, ##__VA_ARGS__);                                  \
2765         __ext4_error(sb, "", 0, " ");                                   \
2766 } while (0)
2767 #define ext4_abort(sb, fmt, ...)                                        \
2768 do {                                                                    \
2769         no_printk(fmt, ##__VA_ARGS__);                                  \
2770         __ext4_abort(sb, "", 0, " ");                                   \
2771 } while (0)
2772 #define ext4_warning(sb, fmt, ...)                                      \
2773 do {                                                                    \
2774         no_printk(fmt, ##__VA_ARGS__);                                  \
2775         __ext4_warning(sb, "", 0, " ");                                 \
2776 } while (0)
2777 #define ext4_warning_inode(inode, fmt, ...)                             \
2778 do {                                                                    \
2779         no_printk(fmt, ##__VA_ARGS__);                                  \
2780         __ext4_warning_inode(inode, "", 0, " ");                        \
2781 } while (0)
2782 #define ext4_msg(sb, level, fmt, ...)                                   \
2783 do {                                                                    \
2784         no_printk(fmt, ##__VA_ARGS__);                                  \
2785         __ext4_msg(sb, "", " ");                                        \
2786 } while (0)
2787 #define dump_mmp_msg(sb, mmp, msg)                                      \
2788         __dump_mmp_msg(sb, mmp, "", 0, "")
2789 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2790 do {                                                                    \
2791         no_printk(fmt, ##__VA_ARGS__);                          \
2792         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2793 } while (0)
2794
2795 #endif
2796
2797 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2798                                         __u32 compat);
2799 extern int ext4_update_rocompat_feature(handle_t *handle,
2800                                         struct super_block *sb, __u32 rocompat);
2801 extern int ext4_update_incompat_feature(handle_t *handle,
2802                                         struct super_block *sb, __u32 incompat);
2803 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2804                                       struct ext4_group_desc *bg);
2805 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2806                                       struct ext4_group_desc *bg);
2807 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2808                                      struct ext4_group_desc *bg);
2809 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2810                                       struct ext4_group_desc *bg);
2811 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2812                                  struct ext4_group_desc *bg);
2813 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2814                                 struct ext4_group_desc *bg);
2815 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2816                                    struct ext4_group_desc *bg);
2817 extern void ext4_block_bitmap_set(struct super_block *sb,
2818                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2819 extern void ext4_inode_bitmap_set(struct super_block *sb,
2820                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2821 extern void ext4_inode_table_set(struct super_block *sb,
2822                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2823 extern void ext4_free_group_clusters_set(struct super_block *sb,
2824                                          struct ext4_group_desc *bg,
2825                                          __u32 count);
2826 extern void ext4_free_inodes_set(struct super_block *sb,
2827                                 struct ext4_group_desc *bg, __u32 count);
2828 extern void ext4_used_dirs_set(struct super_block *sb,
2829                                 struct ext4_group_desc *bg, __u32 count);
2830 extern void ext4_itable_unused_set(struct super_block *sb,
2831                                    struct ext4_group_desc *bg, __u32 count);
2832 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2833                                        struct ext4_group_desc *gdp);
2834 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2835                                      struct ext4_group_desc *gdp);
2836 extern int ext4_register_li_request(struct super_block *sb,
2837                                     ext4_group_t first_not_zeroed);
2838
2839 static inline int ext4_has_metadata_csum(struct super_block *sb)
2840 {
2841         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2842                      !EXT4_SB(sb)->s_chksum_driver);
2843
2844         return ext4_has_feature_metadata_csum(sb) &&
2845                (EXT4_SB(sb)->s_chksum_driver != NULL);
2846 }
2847
2848 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2849 {
2850         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2851 }
2852
2853 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2854 {
2855         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2856                 le32_to_cpu(es->s_blocks_count_lo);
2857 }
2858
2859 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2860 {
2861         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2862                 le32_to_cpu(es->s_r_blocks_count_lo);
2863 }
2864
2865 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2866 {
2867         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2868                 le32_to_cpu(es->s_free_blocks_count_lo);
2869 }
2870
2871 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2872                                          ext4_fsblk_t blk)
2873 {
2874         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2875         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2876 }
2877
2878 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2879                                               ext4_fsblk_t blk)
2880 {
2881         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2882         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2883 }
2884
2885 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2886                                            ext4_fsblk_t blk)
2887 {
2888         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2889         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2890 }
2891
2892 static inline loff_t ext4_isize(struct super_block *sb,
2893                                 struct ext4_inode *raw_inode)
2894 {
2895         if (ext4_has_feature_largedir(sb) ||
2896             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2897                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2898                         le32_to_cpu(raw_inode->i_size_lo);
2899
2900         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2901 }
2902
2903 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2904 {
2905         raw_inode->i_size_lo = cpu_to_le32(i_size);
2906         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2907 }
2908
2909 static inline
2910 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2911                                             ext4_group_t group)
2912 {
2913          struct ext4_group_info ***grp_info;
2914          long indexv, indexh;
2915          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2916          grp_info = EXT4_SB(sb)->s_group_info;
2917          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2918          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2919          return grp_info[indexv][indexh];
2920 }
2921
2922 /*
2923  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2924  * the locking protocol documented in the comments of ext4_group_add()
2925  * in resize.c
2926  */
2927 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2928 {
2929         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2930
2931         smp_rmb();
2932         return ngroups;
2933 }
2934
2935 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2936                                              ext4_group_t block_group)
2937 {
2938         return block_group >> sbi->s_log_groups_per_flex;
2939 }
2940
2941 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2942 {
2943         return 1 << sbi->s_log_groups_per_flex;
2944 }
2945
2946 #define ext4_std_error(sb, errno)                               \
2947 do {                                                            \
2948         if ((errno))                                            \
2949                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2950 } while (0)
2951
2952 #ifdef CONFIG_SMP
2953 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2954  * counters. So we need to make sure we have free clusters more
2955  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2956  */
2957 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2958 #else
2959 #define EXT4_FREECLUSTERS_WATERMARK 0
2960 #endif
2961
2962 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2963 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2964 {
2965         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2966                      !inode_is_locked(inode));
2967         down_write(&EXT4_I(inode)->i_data_sem);
2968         if (newsize > EXT4_I(inode)->i_disksize)
2969                 EXT4_I(inode)->i_disksize = newsize;
2970         up_write(&EXT4_I(inode)->i_data_sem);
2971 }
2972
2973 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2974 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2975 {
2976         int changed = 0;
2977
2978         if (newsize > inode->i_size) {
2979                 i_size_write(inode, newsize);
2980                 changed = 1;
2981         }
2982         if (newsize > EXT4_I(inode)->i_disksize) {
2983                 ext4_update_i_disksize(inode, newsize);
2984                 changed |= 2;
2985         }
2986         return changed;
2987 }
2988
2989 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2990                                       loff_t len);
2991
2992 struct ext4_group_info {
2993         unsigned long   bb_state;
2994         struct rb_root  bb_free_root;
2995         ext4_grpblk_t   bb_first_free;  /* first free block */
2996         ext4_grpblk_t   bb_free;        /* total free blocks */
2997         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2998         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2999         struct          list_head bb_prealloc_list;
3000 #ifdef DOUBLE_CHECK
3001         void            *bb_bitmap;
3002 #endif
3003         struct rw_semaphore alloc_sem;
3004         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3005                                          * regions, index is order.
3006                                          * bb_counters[3] = 5 means
3007                                          * 5 free 8-block regions. */
3008 };
3009
3010 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3011 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3012 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3013 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3014 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3015         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3016 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3017         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3018
3019 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3020         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3021 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3022         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3023 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3024         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3025
3026 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3027         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3028 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3029         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3030 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3031         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3032
3033 #define EXT4_MAX_CONTENTION             8
3034 #define EXT4_CONTENTION_THRESHOLD       2
3035
3036 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3037                                               ext4_group_t group)
3038 {
3039         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3040 }
3041
3042 /*
3043  * Returns true if the filesystem is busy enough that attempts to
3044  * access the block group locks has run into contention.
3045  */
3046 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3047 {
3048         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3049 }
3050
3051 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3052 {
3053         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3054         if (spin_trylock(lock))
3055                 /*
3056                  * We're able to grab the lock right away, so drop the
3057                  * lock contention counter.
3058                  */
3059                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3060         else {
3061                 /*
3062                  * The lock is busy, so bump the contention counter,
3063                  * and then wait on the spin lock.
3064                  */
3065                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3066                                   EXT4_MAX_CONTENTION);
3067                 spin_lock(lock);
3068         }
3069 }
3070
3071 static inline void ext4_unlock_group(struct super_block *sb,
3072                                         ext4_group_t group)
3073 {
3074         spin_unlock(ext4_group_lock_ptr(sb, group));
3075 }
3076
3077 /*
3078  * Block validity checking
3079  */
3080 #define ext4_check_indirect_blockref(inode, bh)                         \
3081         ext4_check_blockref(__func__, __LINE__, inode,                  \
3082                             (__le32 *)(bh)->b_data,                     \
3083                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3084
3085 #define ext4_ind_check_inode(inode)                                     \
3086         ext4_check_blockref(__func__, __LINE__, inode,                  \
3087                             EXT4_I(inode)->i_data,                      \
3088                             EXT4_NDIR_BLOCKS)
3089
3090 /*
3091  * Inodes and files operations
3092  */
3093
3094 /* dir.c */
3095 extern const struct file_operations ext4_dir_operations;
3096
3097 #ifdef CONFIG_UNICODE
3098 extern const struct dentry_operations ext4_dentry_ops;
3099 #endif
3100
3101 /* file.c */
3102 extern const struct inode_operations ext4_file_inode_operations;
3103 extern const struct file_operations ext4_file_operations;
3104 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3105
3106 /* inline.c */
3107 extern int ext4_get_max_inline_size(struct inode *inode);
3108 extern int ext4_find_inline_data_nolock(struct inode *inode);
3109 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3110                                  unsigned int len);
3111 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3112
3113 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3114 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3115                                          struct inode *inode,
3116                                          loff_t pos, unsigned len,
3117                                          unsigned flags,
3118                                          struct page **pagep);
3119 extern int ext4_write_inline_data_end(struct inode *inode,
3120                                       loff_t pos, unsigned len,
3121                                       unsigned copied,
3122                                       struct page *page);
3123 extern struct buffer_head *
3124 ext4_journalled_write_inline_data(struct inode *inode,
3125                                   unsigned len,
3126                                   struct page *page);
3127 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3128                                            struct inode *inode,
3129                                            loff_t pos, unsigned len,
3130                                            unsigned flags,
3131                                            struct page **pagep,
3132                                            void **fsdata);
3133 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3134                                          unsigned len, unsigned copied,
3135                                          struct page *page);
3136 extern int ext4_try_add_inline_entry(handle_t *handle,
3137                                      struct ext4_filename *fname,
3138                                      struct inode *dir, struct inode *inode);
3139 extern int ext4_try_create_inline_dir(handle_t *handle,
3140                                       struct inode *parent,
3141                                       struct inode *inode);
3142 extern int ext4_read_inline_dir(struct file *filp,
3143                                 struct dir_context *ctx,
3144                                 int *has_inline_data);
3145 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3146                                   struct inode *dir, ext4_lblk_t block,
3147                                   struct dx_hash_info *hinfo,
3148                                   __u32 start_hash, __u32 start_minor_hash,
3149                                   int *has_inline_data);
3150 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3151                                         struct ext4_filename *fname,
3152                                         struct ext4_dir_entry_2 **res_dir,
3153                                         int *has_inline_data);
3154 extern int ext4_delete_inline_entry(handle_t *handle,
3155                                     struct inode *dir,
3156                                     struct ext4_dir_entry_2 *de_del,
3157                                     struct buffer_head *bh,
3158                                     int *has_inline_data);
3159 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3160 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3161                                         struct ext4_dir_entry_2 **parent_de,
3162                                         int *retval);
3163 extern int ext4_inline_data_fiemap(struct inode *inode,
3164                                    struct fiemap_extent_info *fieinfo,
3165                                    int *has_inline, __u64 start, __u64 len);
3166
3167 struct iomap;
3168 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3169
3170 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3171
3172 extern int ext4_convert_inline_data(struct inode *inode);
3173
3174 static inline int ext4_has_inline_data(struct inode *inode)
3175 {
3176         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3177                EXT4_I(inode)->i_inline_off;
3178 }
3179
3180 /* namei.c */
3181 extern const struct inode_operations ext4_dir_inode_operations;
3182 extern const struct inode_operations ext4_special_inode_operations;
3183 extern struct dentry *ext4_get_parent(struct dentry *child);
3184 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3185                                  struct ext4_dir_entry_2 *de,
3186                                  int blocksize, int csum_size,
3187                                  unsigned int parent_ino, int dotdot_real_len);
3188 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3189                                         unsigned int blocksize);
3190 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3191                                       struct buffer_head *bh);
3192 extern int ext4_ci_compare(const struct inode *parent,
3193                            const struct qstr *fname,
3194                            const struct qstr *entry, bool quick);
3195
3196 #define S_SHIFT 12
3197 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3198         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3199         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3200         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3201         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3202         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3203         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3204         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3205 };
3206
3207 static inline void ext4_set_de_type(struct super_block *sb,
3208                                 struct ext4_dir_entry_2 *de,
3209                                 umode_t mode) {
3210         if (ext4_has_feature_filetype(sb))
3211                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3212 }
3213
3214 /* readpages.c */
3215 extern int ext4_mpage_readpages(struct address_space *mapping,
3216                                 struct list_head *pages, struct page *page,
3217                                 unsigned nr_pages, bool is_readahead);
3218 extern int __init ext4_init_post_read_processing(void);
3219 extern void ext4_exit_post_read_processing(void);
3220
3221 /* symlink.c */
3222 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3223 extern const struct inode_operations ext4_symlink_inode_operations;
3224 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3225
3226 /* sysfs.c */
3227 extern int ext4_register_sysfs(struct super_block *sb);
3228 extern void ext4_unregister_sysfs(struct super_block *sb);
3229 extern int __init ext4_init_sysfs(void);
3230 extern void ext4_exit_sysfs(void);
3231
3232 /* block_validity */
3233 extern void ext4_release_system_zone(struct super_block *sb);
3234 extern int ext4_setup_system_zone(struct super_block *sb);
3235 extern int __init ext4_init_system_zone(void);
3236 extern void ext4_exit_system_zone(void);
3237 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3238                                  ext4_fsblk_t start_blk,
3239                                  unsigned int count);
3240 extern int ext4_check_blockref(const char *, unsigned int,
3241                                struct inode *, __le32 *, unsigned int);
3242
3243 /* extents.c */
3244 struct ext4_ext_path;
3245 struct ext4_extent;
3246
3247 /*
3248  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3249  * __le32.
3250  */
3251 #define EXT_MAX_BLOCKS  0xffffffff
3252
3253 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3254 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3255 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3256 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3257                                struct ext4_map_blocks *map, int flags);
3258 extern int ext4_ext_truncate(handle_t *, struct inode *);
3259 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3260                                  ext4_lblk_t end);
3261 extern void ext4_ext_init(struct super_block *);
3262 extern void ext4_ext_release(struct super_block *);
3263 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3264                           loff_t len);
3265 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3266                                           loff_t offset, ssize_t len);
3267 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3268                            struct ext4_map_blocks *map, int flags);
3269 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3270                                          ext4_lblk_t lblocks);
3271 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3272                                                    int num,
3273                                                    struct ext4_ext_path *path);
3274 extern int ext4_can_extents_be_merged(struct inode *inode,
3275                                       struct ext4_extent *ex1,
3276                                       struct ext4_extent *ex2);
3277 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3278                                   struct ext4_ext_path **,
3279                                   struct ext4_extent *, int);
3280 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3281                                               struct ext4_ext_path **,
3282                                               int flags);
3283 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3284 extern int ext4_ext_check_inode(struct inode *inode);
3285 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3286 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3287                         __u64 start, __u64 len);
3288 extern int ext4_get_es_cache(struct inode *inode,
3289                              struct fiemap_extent_info *fieinfo,
3290                              __u64 start, __u64 len);
3291 extern int ext4_ext_precache(struct inode *inode);
3292 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3293 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3294 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3295                                 struct inode *inode2, ext4_lblk_t lblk1,
3296                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3297                              int mark_unwritten,int *err);
3298 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3299
3300 /* move_extent.c */
3301 extern void ext4_double_down_write_data_sem(struct inode *first,
3302                                             struct inode *second);
3303 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3304                                           struct inode *donor_inode);
3305 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3306                              __u64 start_orig, __u64 start_donor,
3307                              __u64 len, __u64 *moved_len);
3308
3309 /* page-io.c */
3310 extern int __init ext4_init_pageio(void);
3311 extern void ext4_exit_pageio(void);
3312 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3313 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3314 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3315 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3316 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3317                                 struct writeback_control *wbc);
3318 extern void ext4_end_io_rsv_work(struct work_struct *work);
3319 extern void ext4_io_submit(struct ext4_io_submit *io);
3320 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3321                                struct page *page,
3322                                int len,
3323                                struct writeback_control *wbc,
3324                                bool keep_towrite);
3325
3326 /* mmp.c */
3327 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3328
3329 /* verity.c */
3330 extern const struct fsverity_operations ext4_verityops;
3331
3332 /*
3333  * Add new method to test whether block and inode bitmaps are properly
3334  * initialized. With uninit_bg reading the block from disk is not enough
3335  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3336  */
3337 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3338
3339 static inline int bitmap_uptodate(struct buffer_head *bh)
3340 {
3341         return (buffer_uptodate(bh) &&
3342                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3343 }
3344 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3345 {
3346         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3347 }
3348
3349 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3350
3351 /* For ioend & aio unwritten conversion wait queues */
3352 #define EXT4_WQ_HASH_SZ         37
3353 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3354                                             EXT4_WQ_HASH_SZ])
3355 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3356
3357 extern int ext4_resize_begin(struct super_block *sb);
3358 extern void ext4_resize_end(struct super_block *sb);
3359
3360 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3361                                               struct ext4_io_end *io_end)
3362 {
3363         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3364                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3365                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3366         }
3367 }
3368
3369 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3370 {
3371         struct inode *inode = io_end->inode;
3372
3373         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3374                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3375                 /* Wake up anyone waiting on unwritten extent conversion */
3376                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3377                         wake_up_all(ext4_ioend_wq(inode));
3378         }
3379 }
3380
3381 extern const struct iomap_ops ext4_iomap_ops;
3382
3383 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3384 {
3385         /*
3386          * If the buffer has the write error flag, we have failed
3387          * to write out data in the block.  In this  case, we don't
3388          * have to read the block because we may read the old data
3389          * successfully.
3390          */
3391         if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3392                 set_buffer_uptodate(bh);
3393         return buffer_uptodate(bh);
3394 }
3395
3396 #endif  /* __KERNEL__ */
3397
3398 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3399 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3400
3401 #endif  /* _EXT4_H */