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 == (1U << 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          0xFFFFFFFE
 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  *  I_DATA_SEM_EA     - Used for ea_inodes only
 942  */
 943 enum {
 944         I_DATA_SEM_NORMAL = 0,
 945         I_DATA_SEM_OTHER,
 946         I_DATA_SEM_QUOTA,
 947         I_DATA_SEM_EA
 948 };
 949
 950
 951 /*
 952  * fourth extended file system inode data in memory
 953  */
 954 struct ext4_inode_info {
 955         __le32  i_data[15];     /* unconverted */
 956         __u32   i_dtime;
 957         ext4_fsblk_t    i_file_acl;
 958
 959         /*
 960          * i_block_group is the number of the block group which contains
 961          * this file's inode.  Constant across the lifetime of the inode,
 962          * it is used for making block allocation decisions - we try to
 963          * place a file's data blocks near its inode block, and new inodes
 964          * near to their parent directory's inode.
 965          */
 966         ext4_group_t    i_block_group;
 967         ext4_lblk_t     i_dir_start_lookup;
 968 #if (BITS_PER_LONG < 64)
 969         unsigned long   i_state_flags;          /* Dynamic state flags */
 970 #endif
 971         unsigned long   i_flags;
 972
 973         /*
 974          * Extended attributes can be read independently of the main file
 975          * data. Taking i_mutex even when reading would cause contention
 976          * between readers of EAs and writers of regular file data, so
 977          * instead we synchronize on xattr_sem when reading or changing
 978          * EAs.
 979          */
 980         struct rw_semaphore xattr_sem;
 981
 982         struct list_head i_orphan;      /* unlinked but open inodes */
 983
 984         /*
 985          * i_disksize keeps track of what the inode size is ON DISK, not
 986          * in memory.  During truncate, i_size is set to the new size by
 987          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 988          * set i_disksize to 0 until the truncate is actually under way.
 989          *
 990          * The intent is that i_disksize always represents the blocks which
 991          * are used by this file.  This allows recovery to restart truncate
 992          * on orphans if we crash during truncate.  We actually write i_disksize
 993          * into the on-disk inode when writing inodes out, instead of i_size.
 994          *
 995          * The only time when i_disksize and i_size may be different is when
 996          * a truncate is in progress.  The only things which change i_disksize
 997          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 998          */
 999         loff_t  i_disksize;
1000
1001         /*
1002          * i_data_sem is for serialising ext4_truncate() against
1003          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1004          * data tree are chopped off during truncate. We can't do that in
1005          * ext4 because whenever we perform intermediate commits during
1006          * truncate, the inode and all the metadata blocks *must* be in a
1007          * consistent state which allows truncation of the orphans to restart
1008          * during recovery.  Hence we must fix the get_block-vs-truncate race
1009          * by other means, so we have i_data_sem.
1010          */
1011         struct rw_semaphore i_data_sem;
1012         /*
1013          * i_mmap_sem is for serializing page faults with truncate / punch hole
1014          * operations. We have to make sure that new page cannot be faulted in
1015          * a section of the inode that is being punched. We cannot easily use
1016          * i_data_sem for this since we need protection for the whole punch
1017          * operation and i_data_sem ranks below transaction start so we have
1018          * to occasionally drop it.
1019          */
1020         struct rw_semaphore i_mmap_sem;
1021         struct inode vfs_inode;
1022         struct jbd2_inode *jinode;
1023
1024         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1025
1026         /*
1027          * File creation time. Its function is same as that of
1028          * struct timespec64 i_{a,c,m}time in the generic inode.
1029          */
1030         struct timespec64 i_crtime;
1031
1032         /* mballoc */
1033         struct list_head i_prealloc_list;
1034         spinlock_t i_prealloc_lock;
1035
1036         /* extents status tree */
1037         struct ext4_es_tree i_es_tree;
1038         rwlock_t i_es_lock;
1039         struct list_head i_es_list;
1040         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1041         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1042         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1043                                            extents to shrink. Protected by
1044                                            i_es_lock  */
1045
1046         /* ialloc */
1047         ext4_group_t    i_last_alloc_group;
1048
1049         /* allocation reservation info for delalloc */
1050         /* In case of bigalloc, this refer to clusters rather than blocks */
1051         unsigned int i_reserved_data_blocks;
1052         ext4_lblk_t i_da_metadata_calc_last_lblock;
1053         int i_da_metadata_calc_len;
1054
1055         /* pending cluster reservations for bigalloc file systems */
1056         struct ext4_pending_tree i_pending_tree;
1057
1058         /* on-disk additional length */
1059         __u16 i_extra_isize;
1060
1061         /* Indicate the inline data space. */
1062         u16 i_inline_off;
1063         u16 i_inline_size;
1064
1065 #ifdef CONFIG_QUOTA
1066         /* quota space reservation, managed internally by quota code */
1067         qsize_t i_reserved_quota;
1068 #endif
1069
1070         /* Lock protecting lists below */
1071         spinlock_t i_completed_io_lock;
1072         /*
1073          * Completed IOs that need unwritten extents handling and have
1074          * transaction reserved
1075          */
1076         struct list_head i_rsv_conversion_list;
1077         struct work_struct i_rsv_conversion_work;
1078         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1079
1080         spinlock_t i_block_reservation_lock;
1081
1082         /*
1083          * Transactions that contain inode's metadata needed to complete
1084          * fsync and fdatasync, respectively.
1085          */
1086         tid_t i_sync_tid;
1087         tid_t i_datasync_tid;
1088
1089 #ifdef CONFIG_QUOTA
1090         struct dquot *i_dquot[MAXQUOTAS];
1091 #endif
1092
1093         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1094         __u32 i_csum_seed;
1095
1096         kprojid_t i_projid;
1097 };
1098
1099 /*
1100  * File system states
1101  */
1102 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1103 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1104 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1105
1106 /*
1107  * Misc. filesystem flags
1108  */
1109 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1110 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1111 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1112
1113 /*
1114  * Mount flags set via mount options or defaults
1115  */
1116 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1117 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1118 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1119 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1120 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1121 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1122 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1123 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1124 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1125 #ifdef CONFIG_FS_DAX
1126 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1127 #else
1128 #define EXT4_MOUNT_DAX                  0
1129 #endif
1130 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1131 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1132 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1133 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1134 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1135 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1136 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1137 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1138 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1139 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1140 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1141 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1142                                                  * enable enforcement for hidden
1143                                                  * quota files */
1144 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1145                                                   * enforcement for hidden quota
1146                                                   * files */
1147 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1148                                                   * enforcement */
1149 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1150 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1151 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1152 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1153 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1154 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1155 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1156 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1157 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1158
1159 /*
1160  * Mount flags set either automatically (could not be set by mount option)
1161  * based on per file system feature or property or in special cases such as
1162  * distinguishing between explicit mount option definition and default.
1163  */
1164 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1165                                                       specified delalloc */
1166 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1167                                                       size of blocksize * 8
1168                                                       blocks */
1169 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1170                                                       file systems */
1171
1172 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1173                                                 specified journal checksum */
1174
1175 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1176                                                 ~EXT4_MOUNT_##opt
1177 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1178                                                 EXT4_MOUNT_##opt
1179 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1180                                          EXT4_MOUNT_##opt)
1181
1182 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1183                                                 ~EXT4_MOUNT2_##opt
1184 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1185                                                 EXT4_MOUNT2_##opt
1186 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1187                                          EXT4_MOUNT2_##opt)
1188
1189 #define ext4_test_and_set_bit           __test_and_set_bit_le
1190 #define ext4_set_bit                    __set_bit_le
1191 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1192 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1193 #define ext4_clear_bit                  __clear_bit_le
1194 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1195 #define ext4_test_bit                   test_bit_le
1196 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1197 #define ext4_find_next_bit              find_next_bit_le
1198
1199 extern void ext4_set_bits(void *bm, int cur, int len);
1200
1201 /*
1202  * Maximal mount counts between two filesystem checks
1203  */
1204 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1205 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1206
1207 /*
1208  * Behaviour when detecting errors
1209  */
1210 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1211 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1212 #define EXT4_ERRORS_PANIC               3       /* Panic */
1213 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1214
1215 /* Metadata checksum algorithm codes */
1216 #define EXT4_CRC32C_CHKSUM              1
1217
1218 /*
1219  * Structure of the super block
1220  */
1221 struct ext4_super_block {
1222 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1223         __le32  s_blocks_count_lo;      /* Blocks count */
1224         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1225         __le32  s_free_blocks_count_lo; /* Free blocks count */
1226 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1227         __le32  s_first_data_block;     /* First Data Block */
1228         __le32  s_log_block_size;       /* Block size */
1229         __le32  s_log_cluster_size;     /* Allocation cluster size */
1230 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1231         __le32  s_clusters_per_group;   /* # Clusters per group */
1232         __le32  s_inodes_per_group;     /* # Inodes per group */
1233         __le32  s_mtime;                /* Mount time */
1234 /*30*/  __le32  s_wtime;                /* Write time */
1235         __le16  s_mnt_count;            /* Mount count */
1236         __le16  s_max_mnt_count;        /* Maximal mount count */
1237         __le16  s_magic;                /* Magic signature */
1238         __le16  s_state;                /* File system state */
1239         __le16  s_errors;               /* Behaviour when detecting errors */
1240         __le16  s_minor_rev_level;      /* minor revision level */
1241 /*40*/  __le32  s_lastcheck;            /* time of last check */
1242         __le32  s_checkinterval;        /* max. time between checks */
1243         __le32  s_creator_os;           /* OS */
1244         __le32  s_rev_level;            /* Revision level */
1245 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1246         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1247         /*
1248          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1249          *
1250          * Note: the difference between the compatible feature set and
1251          * the incompatible feature set is that if there is a bit set
1252          * in the incompatible feature set that the kernel doesn't
1253          * know about, it should refuse to mount the filesystem.
1254          *
1255          * e2fsck's requirements are more strict; if it doesn't know
1256          * about a feature in either the compatible or incompatible
1257          * feature set, it must abort and not try to meddle with
1258          * things it doesn't understand...
1259          */
1260         __le32  s_first_ino;            /* First non-reserved inode */
1261         __le16  s_inode_size;           /* size of inode structure */
1262         __le16  s_block_group_nr;       /* block group # of this superblock */
1263         __le32  s_feature_compat;       /* compatible feature set */
1264 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1265         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1266 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1267 /*78*/  char    s_volume_name[16];      /* volume name */
1268 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1269 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1270         /*
1271          * Performance hints.  Directory preallocation should only
1272          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1273          */
1274         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1275         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1276         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1277         /*
1278          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1279          */
1280 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1281 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1282         __le32  s_journal_dev;          /* device number of journal file */
1283         __le32  s_last_orphan;          /* start of list of inodes to delete */
1284         __le32  s_hash_seed[4];         /* HTREE hash seed */
1285         __u8    s_def_hash_version;     /* Default hash version to use */
1286         __u8    s_jnl_backup_type;
1287         __le16  s_desc_size;            /* size of group descriptor */
1288 /*100*/ __le32  s_default_mount_opts;
1289         __le32  s_first_meta_bg;        /* First metablock block group */
1290         __le32  s_mkfs_time;            /* When the filesystem was created */
1291         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1292         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1293 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1294         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1295         __le32  s_free_blocks_count_hi; /* Free blocks count */
1296         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1297         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1298         __le32  s_flags;                /* Miscellaneous flags */
1299         __le16  s_raid_stride;          /* RAID stride */
1300         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1301         __le64  s_mmp_block;            /* Block for multi-mount protection */
1302         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1303         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1304         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1305         __u8    s_encryption_level;     /* versioning level for encryption */
1306         __u8    s_reserved_pad;         /* Padding to next 32bits */
1307         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1308         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1309         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1310         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1311                                               snapshot's future use */
1312         __le32  s_snapshot_list;        /* inode number of the head of the
1313                                            on-disk snapshot list */
1314 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1315         __le32  s_error_count;          /* number of fs errors */
1316         __le32  s_first_error_time;     /* first time an error happened */
1317         __le32  s_first_error_ino;      /* inode involved in first error */
1318         __le64  s_first_error_block;    /* block involved of first error */
1319         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1320         __le32  s_first_error_line;     /* line number where error happened */
1321         __le32  s_last_error_time;      /* most recent time of an error */
1322         __le32  s_last_error_ino;       /* inode involved in last error */
1323         __le32  s_last_error_line;      /* line number where error happened */
1324         __le64  s_last_error_block;     /* block involved of last error */
1325         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1326 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1327         __u8    s_mount_opts[64];
1328         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1329         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1330         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1331         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1332         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1333         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1334         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1335         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1336         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1337         __u8    s_wtime_hi;
1338         __u8    s_mtime_hi;
1339         __u8    s_mkfs_time_hi;
1340         __u8    s_lastcheck_hi;
1341         __u8    s_first_error_time_hi;
1342         __u8    s_last_error_time_hi;
1343         __u8    s_pad[2];
1344         __le16  s_encoding;             /* Filename charset encoding */
1345         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1346         __le32  s_reserved[95];         /* Padding to the end of the block */
1347         __le32  s_checksum;             /* crc32c(superblock) */
1348 };
1349
1350 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1351
1352 #ifdef __KERNEL__
1353
1354 /*
1355  * run-time mount flags
1356  */
1357 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1358 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1359 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1360
1361 #ifdef CONFIG_FS_ENCRYPTION
1362 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1363                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1364 #else
1365 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1366 #endif
1367
1368 /* Number of quota types we support */
1369 #define EXT4_MAXQUOTAS 3
1370
1371 #define EXT4_ENC_UTF8_12_1      1
1372
1373 /*
1374  * Flags for ext4_sb_info.s_encoding_flags.
1375  */
1376 #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1377
1378 #define ext4_has_strict_mode(sbi) \
1379         (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1380
1381 /*
1382  * fourth extended-fs super-block data in memory
1383  */
1384 struct ext4_sb_info {
1385         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1386         unsigned long s_inodes_per_block;/* Number of inodes per block */
1387         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1388         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1389         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1390         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1391         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1392         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1393         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1394         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1395         unsigned long s_overhead;  /* # of fs overhead clusters */
1396         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1397         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1398         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1399         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1400         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1401         struct buffer_head * __rcu *s_group_desc;
1402         unsigned int s_mount_opt;
1403         unsigned int s_mount_opt2;
1404         unsigned int s_mount_flags;
1405         unsigned int s_def_mount_opt;
1406         ext4_fsblk_t s_sb_block;
1407         atomic64_t s_resv_clusters;
1408         kuid_t s_resuid;
1409         kgid_t s_resgid;
1410         unsigned short s_mount_state;
1411         unsigned short s_pad;
1412         int s_addr_per_block_bits;
1413         int s_desc_per_block_bits;
1414         int s_inode_size;
1415         int s_first_ino;
1416         unsigned int s_inode_readahead_blks;
1417         unsigned int s_inode_goal;
1418         u32 s_hash_seed[4];
1419         int s_def_hash_version;
1420         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1421         struct percpu_counter s_freeclusters_counter;
1422         struct percpu_counter s_freeinodes_counter;
1423         struct percpu_counter s_dirs_counter;
1424         struct percpu_counter s_dirtyclusters_counter;
1425         struct percpu_counter s_sra_exceeded_retry_limit;
1426         struct blockgroup_lock *s_blockgroup_lock;
1427         struct proc_dir_entry *s_proc;
1428         struct kobject s_kobj;
1429         struct completion s_kobj_unregister;
1430         struct super_block *s_sb;
1431 #ifdef CONFIG_UNICODE
1432         struct unicode_map *s_encoding;
1433         __u16 s_encoding_flags;
1434 #endif
1435
1436         /* Journaling */
1437         struct journal_s *s_journal;
1438         struct list_head s_orphan;
1439         struct mutex s_orphan_lock;
1440         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1441         unsigned long s_commit_interval;
1442         u32 s_max_batch_time;
1443         u32 s_min_batch_time;
1444         struct block_device *s_journal_bdev;
1445 #ifdef CONFIG_QUOTA
1446         /* Names of quota files with journalled quota */
1447         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1448         int s_jquota_fmt;                       /* Format of quota to use */
1449 #endif
1450         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1451         struct ext4_system_blocks __rcu *system_blks;
1452
1453 #ifdef EXTENTS_STATS
1454         /* ext4 extents stats */
1455         unsigned long s_ext_min;
1456         unsigned long s_ext_max;
1457         unsigned long s_depth_max;
1458         spinlock_t s_ext_stats_lock;
1459         unsigned long s_ext_blocks;
1460         unsigned long s_ext_extents;
1461 #endif
1462
1463         /* for buddy allocator */
1464         struct ext4_group_info ** __rcu *s_group_info;
1465         struct inode *s_buddy_cache;
1466         spinlock_t s_md_lock;
1467         unsigned short *s_mb_offsets;
1468         unsigned int *s_mb_maxs;
1469         unsigned int s_group_info_size;
1470         unsigned int s_mb_free_pending;
1471         struct list_head s_freed_data_list;     /* List of blocks to be freed
1472                                                    after commit completed */
1473
1474         /* tunables */
1475         unsigned long s_stripe;
1476         unsigned int s_mb_stream_request;
1477         unsigned int s_mb_max_to_scan;
1478         unsigned int s_mb_min_to_scan;
1479         unsigned int s_mb_stats;
1480         unsigned int s_mb_order2_reqs;
1481         unsigned int s_mb_group_prealloc;
1482         unsigned int s_max_dir_size_kb;
1483         /* where last allocation was done - for stream allocation */
1484         unsigned long s_mb_last_group;
1485         unsigned long s_mb_last_start;
1486
1487         /* stats for buddy allocator */
1488         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1489         atomic_t s_bal_success; /* we found long enough chunks */
1490         atomic_t s_bal_allocated;       /* in blocks */
1491         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1492         atomic_t s_bal_goals;   /* goal hits */
1493         atomic_t s_bal_breaks;  /* too long searches */
1494         atomic_t s_bal_2orders; /* 2^order hits */
1495         spinlock_t s_bal_lock;
1496         unsigned long s_mb_buddies_generated;
1497         unsigned long long s_mb_generation_time;
1498         atomic_t s_mb_lost_chunks;
1499         atomic_t s_mb_preallocated;
1500         atomic_t s_mb_discarded;
1501         atomic_t s_lock_busy;
1502
1503         /* locality groups */
1504         struct ext4_locality_group __percpu *s_locality_groups;
1505
1506         /* for write statistics */
1507         unsigned long s_sectors_written_start;
1508         u64 s_kbytes_written;
1509
1510         /* the size of zero-out chunk */
1511         unsigned int s_extent_max_zeroout_kb;
1512
1513         unsigned int s_log_groups_per_flex;
1514         struct flex_groups * __rcu *s_flex_groups;
1515         ext4_group_t s_flex_groups_allocated;
1516
1517         /* workqueue for reserved extent conversions (buffered io) */
1518         struct workqueue_struct *rsv_conversion_wq;
1519
1520         /* timer for periodic error stats printing */
1521         struct timer_list s_err_report;
1522
1523         /* Lazy inode table initialization info */
1524         struct ext4_li_request *s_li_request;
1525         /* Wait multiplier for lazy initialization thread */
1526         unsigned int s_li_wait_mult;
1527
1528         /* Kernel thread for multiple mount protection */
1529         struct task_struct *s_mmp_tsk;
1530
1531         /* record the last minlen when FITRIM is called. */
1532         atomic_t s_last_trim_minblks;
1533
1534         /* Reference to checksum algorithm driver via cryptoapi */
1535         struct crypto_shash *s_chksum_driver;
1536
1537         /* Precomputed FS UUID checksum for seeding other checksums */
1538         __u32 s_csum_seed;
1539
1540         /* Reclaim extents from extent status tree */
1541         struct shrinker s_es_shrinker;
1542         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1543         long s_es_nr_inode;
1544         struct ext4_es_stats s_es_stats;
1545         struct mb_cache *s_ea_block_cache;
1546         struct mb_cache *s_ea_inode_cache;
1547         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1548
1549         /* Ratelimit ext4 messages. */
1550         struct ratelimit_state s_err_ratelimit_state;
1551         struct ratelimit_state s_warning_ratelimit_state;
1552         struct ratelimit_state s_msg_ratelimit_state;
1553
1554         /*
1555          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1556          * or EXTENTS flag.
1557          */
1558         struct percpu_rw_semaphore s_writepages_rwsem;
1559         struct dax_device *s_daxdev;
1560 };
1561
1562 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1563 {
1564         return sb->s_fs_info;
1565 }
1566 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1567 {
1568         return container_of(inode, struct ext4_inode_info, vfs_inode);
1569 }
1570
1571 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1572 {
1573         return ino == EXT4_ROOT_INO ||
1574                 (ino >= EXT4_FIRST_INO(sb) &&
1575                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1576 }
1577
1578 /*
1579  * Returns: sbi->field[index]
1580  * Used to access an array element from the following sbi fields which require
1581  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1582  * - s_group_desc
1583  * - s_group_info
1584  * - s_flex_group
1585  */
1586 #define sbi_array_rcu_deref(sbi, field, index)                             \
1587 ({                                                                         \
1588         typeof(*((sbi)->field)) _v;                                        \
1589         rcu_read_lock();                                                   \
1590         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1591         rcu_read_unlock();                                                 \
1592         _v;                                                                \
1593 })
1594
1595 /*
1596  * Inode dynamic state flags
1597  */
1598 enum {
1599         EXT4_STATE_JDATA,               /* journaled data exists */
1600         EXT4_STATE_NEW,                 /* inode is newly created */
1601         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1602         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1603         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1604         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1605         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1606         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1607         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1608         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1609         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1610         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1611 };
1612
1613 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1614 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1615 {                                                                       \
1616         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1617 }                                                                       \
1618 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1619 {                                                                       \
1620         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1621 }                                                                       \
1622 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1623 {                                                                       \
1624         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1625 }
1626
1627 /* Add these declarations here only so that these functions can be
1628  * found by name.  Otherwise, they are very hard to locate. */
1629 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1630 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1631 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1632 EXT4_INODE_BIT_FNS(flag, flags, 0)
1633
1634 /* Add these declarations here only so that these functions can be
1635  * found by name.  Otherwise, they are very hard to locate. */
1636 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1637 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1638 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1639 #if (BITS_PER_LONG < 64)
1640 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1641
1642 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1643 {
1644         (ei)->i_state_flags = 0;
1645 }
1646 #else
1647 EXT4_INODE_BIT_FNS(state, flags, 32)
1648
1649 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1650 {
1651         /* We depend on the fact that callers will set i_flags */
1652 }
1653 #endif
1654 #else
1655 /* Assume that user mode programs are passing in an ext4fs superblock, not
1656  * a kernel struct super_block.  This will allow us to call the feature-test
1657  * macros from user land. */
1658 #define EXT4_SB(sb)     (sb)
1659 #endif
1660
1661 static inline bool ext4_verity_in_progress(struct inode *inode)
1662 {
1663         return IS_ENABLED(CONFIG_FS_VERITY) &&
1664                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1665 }
1666
1667 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1668
1669 /*
1670  * Codes for operating systems
1671  */
1672 #define EXT4_OS_LINUX           0
1673 #define EXT4_OS_HURD            1
1674 #define EXT4_OS_MASIX           2
1675 #define EXT4_OS_FREEBSD         3
1676 #define EXT4_OS_LITES           4
1677
1678 /*
1679  * Revision levels
1680  */
1681 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1682 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1683
1684 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1685 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1686
1687 #define EXT4_GOOD_OLD_INODE_SIZE 128
1688
1689 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1690 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1691 #define EXT4_TIMESTAMP_MIN              S32_MIN
1692
1693 /*
1694  * Feature set definitions
1695  */
1696
1697 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1698 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1699 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1700 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1701 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1702 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1703 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1704
1705 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1706 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1707 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1708 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1709 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1710 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1711 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1712 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1713 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1714 /*
1715  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1716  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1717  * all other data structures' checksums.  However, the METADATA_CSUM and
1718  * GDT_CSUM bits are mutually exclusive.
1719  */
1720 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1721 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1722 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1723 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
1724
1725 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1726 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1727 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1728 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1729 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1730 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1731 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1732 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1733 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1734 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1735 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1736 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1737 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1738 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1739 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1740 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1741
1742 extern void ext4_update_dynamic_rev(struct super_block *sb);
1743
1744 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1745 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1746 { \
1747         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1748                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1749 } \
1750 static inline void ext4_set_feature_##name(struct super_block *sb) \
1751 { \
1752         ext4_update_dynamic_rev(sb); \
1753         EXT4_SB(sb)->s_es->s_feature_compat |= \
1754                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1755 } \
1756 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1757 { \
1758         EXT4_SB(sb)->s_es->s_feature_compat &= \
1759                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1760 }
1761
1762 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1763 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1764 { \
1765         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1766                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1767 } \
1768 static inline void ext4_set_feature_##name(struct super_block *sb) \
1769 { \
1770         ext4_update_dynamic_rev(sb); \
1771         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1772                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1773 } \
1774 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1775 { \
1776         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1777                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1778 }
1779
1780 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1781 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1782 { \
1783         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1784                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1785 } \
1786 static inline void ext4_set_feature_##name(struct super_block *sb) \
1787 { \
1788         ext4_update_dynamic_rev(sb); \
1789         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1790                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1791 } \
1792 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1793 { \
1794         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1795                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1796 }
1797
1798 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1799 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1800 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1801 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1802 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1803 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1804 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1805
1806 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1807 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1808 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1809 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1810 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1811 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1812 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1813 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1814 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1815 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1816 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1817 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1818 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
1819
1820 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1821 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1822 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1823 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1824 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1825 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1826 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1827 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1828 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1829 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1830 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1831 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1832 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1833 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1834 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1835 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
1836
1837 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1838 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1839                                          EXT4_FEATURE_INCOMPAT_META_BG)
1840 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1841                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1842                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1843
1844 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1845 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1846                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1847                                          EXT4_FEATURE_INCOMPAT_META_BG)
1848 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1849                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1850                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1851
1852 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1853 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1854                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1855                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1856                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1857                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1858                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1859                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1860                                          EXT4_FEATURE_INCOMPAT_MMP | \
1861                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1862                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1863                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1864                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1865                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1866 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1867                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1868                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1869                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1870                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1871                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1872                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1873                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1874                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1875                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1876                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
1877                                          EXT4_FEATURE_RO_COMPAT_VERITY)
1878
1879 #define EXTN_FEATURE_FUNCS(ver) \
1880 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1881 { \
1882         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1883                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1884 } \
1885 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1886 { \
1887         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1888                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1889 } \
1890 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1891 { \
1892         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1893                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1894 }
1895
1896 EXTN_FEATURE_FUNCS(2)
1897 EXTN_FEATURE_FUNCS(3)
1898 EXTN_FEATURE_FUNCS(4)
1899
1900 static inline bool ext4_has_compat_features(struct super_block *sb)
1901 {
1902         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1903 }
1904 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1905 {
1906         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1907 }
1908 static inline bool ext4_has_incompat_features(struct super_block *sb)
1909 {
1910         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1911 }
1912
1913 /*
1914  * Superblock flags
1915  */
1916 #define EXT4_FLAGS_RESIZING     0
1917 #define EXT4_FLAGS_SHUTDOWN     1
1918
1919 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1920 {
1921         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1922 }
1923
1924
1925 /*
1926  * Default values for user and/or group using reserved blocks
1927  */
1928 #define EXT4_DEF_RESUID         0
1929 #define EXT4_DEF_RESGID         0
1930
1931 /*
1932  * Default project ID
1933  */
1934 #define EXT4_DEF_PROJID         0
1935
1936 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1937
1938 /*
1939  * Default mount options
1940  */
1941 #define EXT4_DEFM_DEBUG         0x0001
1942 #define EXT4_DEFM_BSDGROUPS     0x0002
1943 #define EXT4_DEFM_XATTR_USER    0x0004
1944 #define EXT4_DEFM_ACL           0x0008
1945 #define EXT4_DEFM_UID16         0x0010
1946 #define EXT4_DEFM_JMODE         0x0060
1947 #define EXT4_DEFM_JMODE_DATA    0x0020
1948 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1949 #define EXT4_DEFM_JMODE_WBACK   0x0060
1950 #define EXT4_DEFM_NOBARRIER     0x0100
1951 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1952 #define EXT4_DEFM_DISCARD       0x0400
1953 #define EXT4_DEFM_NODELALLOC    0x0800
1954
1955 /*
1956  * Default journal batch times
1957  */
1958 #define EXT4_DEF_MIN_BATCH_TIME 0
1959 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1960
1961 /*
1962  * Minimum number of groups in a flexgroup before we separate out
1963  * directories into the first block group of a flexgroup
1964  */
1965 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1966
1967 /*
1968  * Structure of a directory entry
1969  */
1970 #define EXT4_NAME_LEN 255
1971 /*
1972  * Base length of the ext4 directory entry excluding the name length
1973  */
1974 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
1975
1976 struct ext4_dir_entry {
1977         __le32  inode;                  /* Inode number */
1978         __le16  rec_len;                /* Directory entry length */
1979         __le16  name_len;               /* Name length */
1980         char    name[EXT4_NAME_LEN];    /* File name */
1981 };
1982
1983 /*
1984  * The new version of the directory entry.  Since EXT4 structures are
1985  * stored in intel byte order, and the name_len field could never be
1986  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1987  * file_type field.
1988  */
1989 struct ext4_dir_entry_2 {
1990         __le32  inode;                  /* Inode number */
1991         __le16  rec_len;                /* Directory entry length */
1992         __u8    name_len;               /* Name length */
1993         __u8    file_type;
1994         char    name[EXT4_NAME_LEN];    /* File name */
1995 };
1996
1997 /*
1998  * This is a bogus directory entry at the end of each leaf block that
1999  * records checksums.
2000  */
2001 struct ext4_dir_entry_tail {
2002         __le32  det_reserved_zero1;     /* Pretend to be unused */
2003         __le16  det_rec_len;            /* 12 */
2004         __u8    det_reserved_zero2;     /* Zero name length */
2005         __u8    det_reserved_ft;        /* 0xDE, fake file type */
2006         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2007 };
2008
2009 #define EXT4_DIRENT_TAIL(block, blocksize) \
2010         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2011                                         ((blocksize) - \
2012                                          sizeof(struct ext4_dir_entry_tail))))
2013
2014 /*
2015  * Ext4 directory file types.  Only the low 3 bits are used.  The
2016  * other bits are reserved for now.
2017  */
2018 #define EXT4_FT_UNKNOWN         0
2019 #define EXT4_FT_REG_FILE        1
2020 #define EXT4_FT_DIR             2
2021 #define EXT4_FT_CHRDEV          3
2022 #define EXT4_FT_BLKDEV          4
2023 #define EXT4_FT_FIFO            5
2024 #define EXT4_FT_SOCK            6
2025 #define EXT4_FT_SYMLINK         7
2026
2027 #define EXT4_FT_MAX             8
2028
2029 #define EXT4_FT_DIR_CSUM        0xDE
2030
2031 /*
2032  * EXT4_DIR_PAD defines the directory entries boundaries
2033  *
2034  * NOTE: It must be a multiple of 4
2035  */
2036 #define EXT4_DIR_PAD                    4
2037 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2038 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
2039                                          ~EXT4_DIR_ROUND)
2040 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2041
2042 /*
2043  * If we ever get support for fs block sizes > page_size, we'll need
2044  * to remove the #if statements in the next two functions...
2045  */
2046 static inline unsigned int
2047 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2048 {
2049         unsigned len = le16_to_cpu(dlen);
2050
2051 #if (PAGE_SIZE >= 65536)
2052         if (len == EXT4_MAX_REC_LEN || len == 0)
2053                 return blocksize;
2054         return (len & 65532) | ((len & 3) << 16);
2055 #else
2056         return len;
2057 #endif
2058 }
2059
2060 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2061 {
2062         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2063                 BUG();
2064 #if (PAGE_SIZE >= 65536)
2065         if (len < 65536)
2066                 return cpu_to_le16(len);
2067         if (len == blocksize) {
2068                 if (blocksize == 65536)
2069                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2070                 else
2071                         return cpu_to_le16(0);
2072         }
2073         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2074 #else
2075         return cpu_to_le16(len);
2076 #endif
2077 }
2078
2079 /*
2080  * Hash Tree Directory indexing
2081  * (c) Daniel Phillips, 2001
2082  */
2083
2084 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2085                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2086 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2087                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2088 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2089
2090 /* Legal values for the dx_root hash_version field: */
2091
2092 #define DX_HASH_LEGACY                  0
2093 #define DX_HASH_HALF_MD4                1
2094 #define DX_HASH_TEA                     2
2095 #define DX_HASH_LEGACY_UNSIGNED         3
2096 #define DX_HASH_HALF_MD4_UNSIGNED       4
2097 #define DX_HASH_TEA_UNSIGNED            5
2098
2099 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2100                               const void *address, unsigned int length)
2101 {
2102         struct {
2103                 struct shash_desc shash;
2104                 char ctx[4];
2105         } desc;
2106
2107         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2108
2109         desc.shash.tfm = sbi->s_chksum_driver;
2110         *(u32 *)desc.ctx = crc;
2111
2112         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2113
2114         return *(u32 *)desc.ctx;
2115 }
2116
2117 #ifdef __KERNEL__
2118
2119 /* hash info structure used by the directory hash */
2120 struct dx_hash_info
2121 {
2122         u32             hash;
2123         u32             minor_hash;
2124         int             hash_version;
2125         u32             *seed;
2126 };
2127
2128
2129 /* 32 and 64 bit signed EOF for dx directories */
2130 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2131 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2132
2133
2134 /*
2135  * Control parameters used by ext4_htree_next_block
2136  */
2137 #define HASH_NB_ALWAYS          1
2138
2139 struct ext4_filename {
2140         const struct qstr *usr_fname;
2141         struct fscrypt_str disk_name;
2142         struct dx_hash_info hinfo;
2143 #ifdef CONFIG_FS_ENCRYPTION
2144         struct fscrypt_str crypto_buf;
2145 #endif
2146 #ifdef CONFIG_UNICODE
2147         struct fscrypt_str cf_name;
2148 #endif
2149 };
2150
2151 #define fname_name(p) ((p)->disk_name.name)
2152 #define fname_len(p)  ((p)->disk_name.len)
2153
2154 /*
2155  * Describe an inode's exact location on disk and in memory
2156  */
2157 struct ext4_iloc
2158 {
2159         struct buffer_head *bh;
2160         unsigned long offset;
2161         ext4_group_t block_group;
2162 };
2163
2164 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2165 {
2166         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2167 }
2168
2169 static inline bool ext4_is_quota_file(struct inode *inode)
2170 {
2171         return IS_NOQUOTA(inode) &&
2172                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2173 }
2174
2175 /*
2176  * This structure is stuffed into the struct file's private_data field
2177  * for directories.  It is where we put information so that we can do
2178  * readdir operations in hash tree order.
2179  */
2180 struct dir_private_info {
2181         struct rb_root  root;
2182         struct rb_node  *curr_node;
2183         struct fname    *extra_fname;
2184         loff_t          last_pos;
2185         __u32           curr_hash;
2186         __u32           curr_minor_hash;
2187         __u32           next_hash;
2188 };
2189
2190 /* calculate the first block number of the group */
2191 static inline ext4_fsblk_t
2192 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2193 {
2194         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2195                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2196 }
2197
2198 /*
2199  * Special error return code only used by dx_probe() and its callers.
2200  */
2201 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2202
2203 /* htree levels for ext4 */
2204 #define EXT4_HTREE_LEVEL_COMPAT 2
2205 #define EXT4_HTREE_LEVEL        3
2206
2207 static inline int ext4_dir_htree_level(struct super_block *sb)
2208 {
2209         return ext4_has_feature_largedir(sb) ?
2210                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2211 }
2212
2213 /*
2214  * Timeout and state flag for lazy initialization inode thread.
2215  */
2216 #define EXT4_DEF_LI_WAIT_MULT                   10
2217 #define EXT4_DEF_LI_MAX_START_DELAY             5
2218 #define EXT4_LAZYINIT_QUIT                      0x0001
2219 #define EXT4_LAZYINIT_RUNNING                   0x0002
2220
2221 /*
2222  * Lazy inode table initialization info
2223  */
2224 struct ext4_lazy_init {
2225         unsigned long           li_state;
2226         struct list_head        li_request_list;
2227         struct mutex            li_list_mtx;
2228 };
2229
2230 struct ext4_li_request {
2231         struct super_block      *lr_super;
2232         struct ext4_sb_info     *lr_sbi;
2233         ext4_group_t            lr_next_group;
2234         struct list_head        lr_request;
2235         unsigned long           lr_next_sched;
2236         unsigned long           lr_timeout;
2237 };
2238
2239 struct ext4_features {
2240         struct kobject f_kobj;
2241         struct completion f_kobj_unregister;
2242 };
2243
2244 /*
2245  * This structure will be used for multiple mount protection. It will be
2246  * written into the block number saved in the s_mmp_block field in the
2247  * superblock. Programs that check MMP should assume that if
2248  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2249  * to use the filesystem, regardless of how old the timestamp is.
2250  */
2251 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2252 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2253 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2254 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2255
2256 struct mmp_struct {
2257         __le32  mmp_magic;              /* Magic number for MMP */
2258         __le32  mmp_seq;                /* Sequence no. updated periodically */
2259
2260         /*
2261          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2262          * purposes and do not affect the correctness of the algorithm
2263          */
2264         __le64  mmp_time;               /* Time last updated */
2265         char    mmp_nodename[64];       /* Node which last updated MMP block */
2266         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2267
2268         /*
2269          * mmp_check_interval is used to verify if the MMP block has been
2270          * updated on the block device. The value is updated based on the
2271          * maximum time to write the MMP block during an update cycle.
2272          */
2273         __le16  mmp_check_interval;
2274
2275         __le16  mmp_pad1;
2276         __le32  mmp_pad2[226];
2277         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2278 };
2279
2280 /* arguments passed to the mmp thread */
2281 struct mmpd_data {
2282         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2283         struct super_block *sb;  /* super block of the fs */
2284 };
2285
2286 /*
2287  * Check interval multiplier
2288  * The MMP block is written every update interval and initially checked every
2289  * update interval x the multiplier (the value is then adapted based on the
2290  * write latency). The reason is that writes can be delayed under load and we
2291  * don't want readers to incorrectly assume that the filesystem is no longer
2292  * in use.
2293  */
2294 #define EXT4_MMP_CHECK_MULT             2UL
2295
2296 /*
2297  * Minimum interval for MMP checking in seconds.
2298  */
2299 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2300
2301 /*
2302  * Maximum interval for MMP checking in seconds.
2303  */
2304 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2305
2306 /*
2307  * Function prototypes
2308  */
2309
2310 /*
2311  * Ok, these declarations are also in <linux/kernel.h> but none of the
2312  * ext4 source programs needs to include it so they are duplicated here.
2313  */
2314 # define NORET_TYPE     /**/
2315 # define ATTRIB_NORET   __attribute__((noreturn))
2316 # define NORET_AND      noreturn,
2317
2318 /* bitmap.c */
2319 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2320 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2321                                 struct ext4_group_desc *gdp,
2322                                 struct buffer_head *bh, int sz);
2323 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2324                                   struct ext4_group_desc *gdp,
2325                                   struct buffer_head *bh, int sz);
2326 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2327                                 struct ext4_group_desc *gdp,
2328                                 struct buffer_head *bh);
2329 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2330                                   struct ext4_group_desc *gdp,
2331                                   struct buffer_head *bh);
2332
2333 /* balloc.c */
2334 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2335                                          ext4_fsblk_t blocknr,
2336                                          ext4_group_t *blockgrpp,
2337                                          ext4_grpblk_t *offsetp);
2338 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2339                                           ext4_fsblk_t block);
2340
2341 extern unsigned int ext4_block_group(struct super_block *sb,
2342                         ext4_fsblk_t blocknr);
2343 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2344                         ext4_fsblk_t blocknr);
2345 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2346 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2347                         ext4_group_t group);
2348 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2349                                          ext4_fsblk_t goal,
2350                                          unsigned int flags,
2351                                          unsigned long *count,
2352                                          int *errp);
2353 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2354                                     s64 nclusters, unsigned int flags);
2355 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2356 extern void ext4_check_blocks_bitmap(struct super_block *);
2357 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2358                                                     ext4_group_t block_group,
2359                                                     struct buffer_head ** bh);
2360 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2361
2362 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2363                                                 ext4_group_t block_group);
2364 extern int ext4_wait_block_bitmap(struct super_block *sb,
2365                                   ext4_group_t block_group,
2366                                   struct buffer_head *bh);
2367 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2368                                                   ext4_group_t block_group);
2369 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2370                                               ext4_group_t block_group,
2371                                               struct ext4_group_desc *gdp);
2372 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2373
2374 #ifdef CONFIG_UNICODE
2375 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2376                                          const struct qstr *iname,
2377                                          struct fscrypt_str *fname);
2378 #endif
2379
2380 #ifdef CONFIG_FS_ENCRYPTION
2381 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2382                                                 const struct fscrypt_name *src)
2383 {
2384         memset(dst, 0, sizeof(*dst));
2385
2386         dst->usr_fname = src->usr_fname;
2387         dst->disk_name = src->disk_name;
2388         dst->hinfo.hash = src->hash;
2389         dst->hinfo.minor_hash = src->minor_hash;
2390         dst->crypto_buf = src->crypto_buf;
2391 }
2392
2393 static inline int ext4_fname_setup_filename(struct inode *dir,
2394                                             const struct qstr *iname,
2395                                             int lookup,
2396                                             struct ext4_filename *fname)
2397 {
2398         struct fscrypt_name name;
2399         int err;
2400
2401         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2402         if (err)
2403                 return err;
2404
2405         ext4_fname_from_fscrypt_name(fname, &name);
2406
2407 #ifdef CONFIG_UNICODE
2408         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2409 #endif
2410         return 0;
2411 }
2412
2413 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2414                                             struct dentry *dentry,
2415                                             struct ext4_filename *fname)
2416 {
2417         struct fscrypt_name name;
2418         int err;
2419
2420         err = fscrypt_prepare_lookup(dir, dentry, &name);
2421         if (err)
2422                 return err;
2423
2424         ext4_fname_from_fscrypt_name(fname, &name);
2425
2426 #ifdef CONFIG_UNICODE
2427         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2428 #endif
2429         return 0;
2430 }
2431
2432 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2433 {
2434         struct fscrypt_name name;
2435
2436         name.crypto_buf = fname->crypto_buf;
2437         fscrypt_free_filename(&name);
2438
2439         fname->crypto_buf.name = NULL;
2440         fname->usr_fname = NULL;
2441         fname->disk_name.name = NULL;
2442
2443 #ifdef CONFIG_UNICODE
2444         kfree(fname->cf_name.name);
2445         fname->cf_name.name = NULL;
2446 #endif
2447 }
2448 #else /* !CONFIG_FS_ENCRYPTION */
2449 static inline int ext4_fname_setup_filename(struct inode *dir,
2450                                             const struct qstr *iname,
2451                                             int lookup,
2452                                             struct ext4_filename *fname)
2453 {
2454         fname->usr_fname = iname;
2455         fname->disk_name.name = (unsigned char *) iname->name;
2456         fname->disk_name.len = iname->len;
2457
2458 #ifdef CONFIG_UNICODE
2459         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2460 #endif
2461
2462         return 0;
2463 }
2464
2465 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2466                                             struct dentry *dentry,
2467                                             struct ext4_filename *fname)
2468 {
2469         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2470 }
2471
2472 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2473 {
2474 #ifdef CONFIG_UNICODE
2475         kfree(fname->cf_name.name);
2476         fname->cf_name.name = NULL;
2477 #endif
2478 }
2479 #endif /* !CONFIG_FS_ENCRYPTION */
2480
2481 /* dir.c */
2482 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2483                                   struct file *,
2484                                   struct ext4_dir_entry_2 *,
2485                                   struct buffer_head *, char *, int,
2486                                   unsigned int);
2487 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2488         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2489                                         (de), (bh), (buf), (size), (offset)))
2490 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2491                                 __u32 minor_hash,
2492                                 struct ext4_dir_entry_2 *dirent,
2493                                 struct fscrypt_str *ent_name);
2494 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2495 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2496                              struct buffer_head *bh,
2497                              void *buf, int buf_size,
2498                              struct ext4_filename *fname,
2499                              struct ext4_dir_entry_2 **dest_de);
2500 void ext4_insert_dentry(struct inode *inode,
2501                         struct ext4_dir_entry_2 *de,
2502                         int buf_size,
2503                         struct ext4_filename *fname);
2504 static inline void ext4_update_dx_flag(struct inode *inode)
2505 {
2506         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2507             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2508                 /* ext4_iget() should have caught this... */
2509                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2510                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2511         }
2512 }
2513 static const unsigned char ext4_filetype_table[] = {
2514         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2515 };
2516
2517 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2518 {
2519         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2520                 return DT_UNKNOWN;
2521
2522         return ext4_filetype_table[filetype];
2523 }
2524 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2525                              void *buf, int buf_size);
2526
2527 /* fsync.c */
2528 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2529
2530 /* hash.c */
2531 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2532                           struct dx_hash_info *hinfo);
2533
2534 /* ialloc.c */
2535 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2536                                       const struct qstr *qstr, __u32 goal,
2537                                       uid_t *owner, __u32 i_flags,
2538                                       int handle_type, unsigned int line_no,
2539                                       int nblocks);
2540
2541 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2542         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2543                          i_flags, 0, 0, 0)
2544 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2545                                     type, nblocks)                  \
2546         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2547                          0, (type), __LINE__, (nblocks))
2548
2549
2550 extern void ext4_free_inode(handle_t *, struct inode *);
2551 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2552 extern unsigned long ext4_count_free_inodes(struct super_block *);
2553 extern unsigned long ext4_count_dirs(struct super_block *);
2554 extern void ext4_check_inodes_bitmap(struct super_block *);
2555 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2556 extern int ext4_init_inode_table(struct super_block *sb,
2557                                  ext4_group_t group, int barrier);
2558 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2559
2560 /* mballoc.c */
2561 extern const struct seq_operations ext4_mb_seq_groups_ops;
2562 extern long ext4_mb_stats;
2563 extern long ext4_mb_max_to_scan;
2564 extern int ext4_mb_init(struct super_block *);
2565 extern int ext4_mb_release(struct super_block *);
2566 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2567                                 struct ext4_allocation_request *, int *);
2568 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2569 extern void ext4_discard_preallocations(struct inode *);
2570 extern int __init ext4_init_mballoc(void);
2571 extern void ext4_exit_mballoc(void);
2572 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2573                              struct buffer_head *bh, ext4_fsblk_t block,
2574                              unsigned long count, int flags);
2575 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2576                                    ext4_group_t ngroups);
2577 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2578                 ext4_group_t i, struct ext4_group_desc *desc);
2579 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2580                                 ext4_fsblk_t block, unsigned long count);
2581 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2582 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2583
2584 /* inode.c */
2585 int ext4_inode_is_fast_symlink(struct inode *inode);
2586 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2587 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2588 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2589                      bool wait, struct buffer_head **bhs);
2590 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2591                              struct buffer_head *bh_result, int create);
2592 int ext4_get_block(struct inode *inode, sector_t iblock,
2593                    struct buffer_head *bh_result, int create);
2594 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2595                        struct buffer_head *bh_result, int create);
2596 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2597                            struct buffer_head *bh, int create);
2598 int ext4_walk_page_buffers(handle_t *handle,
2599                            struct buffer_head *head,
2600                            unsigned from,
2601                            unsigned to,
2602                            int *partial,
2603                            int (*fn)(handle_t *handle,
2604                                      struct buffer_head *bh));
2605 int do_journal_get_write_access(handle_t *handle,
2606                                 struct buffer_head *bh);
2607 #define FALL_BACK_TO_NONDELALLOC 1
2608 #define CONVERT_INLINE_DATA      2
2609
2610 typedef enum {
2611         EXT4_IGET_NORMAL =      0,
2612         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2613         EXT4_IGET_HANDLE =      0x0002, /* Inode # is from a handle */
2614         EXT4_IGET_BAD =         0x0004, /* Allow to iget a bad inode */
2615         EXT4_IGET_EA_INODE =    0x0008  /* Inode should contain an EA value */
2616 } ext4_iget_flags;
2617
2618 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2619                                  ext4_iget_flags flags, const char *function,
2620                                  unsigned int line);
2621
2622 #define ext4_iget(sb, ino, flags) \
2623         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2624
2625 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2626 extern int  ext4_setattr(struct dentry *, struct iattr *);
2627 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2628 extern void ext4_evict_inode(struct inode *);
2629 extern void ext4_clear_inode(struct inode *);
2630 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2631 extern int  ext4_sync_inode(handle_t *, struct inode *);
2632 extern void ext4_dirty_inode(struct inode *, int);
2633 extern int ext4_change_inode_journal_flag(struct inode *, int);
2634 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2635 extern int ext4_inode_attach_jinode(struct inode *inode);
2636 extern int ext4_can_truncate(struct inode *inode);
2637 extern int ext4_truncate(struct inode *);
2638 extern int ext4_break_layouts(struct inode *);
2639 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2640 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2641 extern void ext4_set_inode_flags(struct inode *);
2642 extern int ext4_alloc_da_blocks(struct inode *inode);
2643 extern void ext4_set_aops(struct inode *inode);
2644 extern int ext4_writepage_trans_blocks(struct inode *);
2645 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2646 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2647                              loff_t lstart, loff_t lend);
2648 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2649 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2650 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2651 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2652 extern void ext4_da_release_space(struct inode *inode, int to_free);
2653 extern void ext4_da_update_reserve_space(struct inode *inode,
2654                                         int used, int quota_claim);
2655 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2656                               ext4_fsblk_t pblk, ext4_lblk_t len);
2657
2658 /* indirect.c */
2659 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2660                                 struct ext4_map_blocks *map, int flags);
2661 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2662 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2663 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2664 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2665                                  ext4_lblk_t start, ext4_lblk_t end);
2666
2667 /* ioctl.c */
2668 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2669 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2670
2671 /* migrate.c */
2672 extern int ext4_ext_migrate(struct inode *);
2673 extern int ext4_ind_migrate(struct inode *inode);
2674
2675 /* namei.c */
2676 extern int ext4_dirblock_csum_verify(struct inode *inode,
2677                                      struct buffer_head *bh);
2678 extern int ext4_orphan_add(handle_t *, struct inode *);
2679 extern int ext4_orphan_del(handle_t *, struct inode *);
2680 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2681                                 __u32 start_minor_hash, __u32 *next_hash);
2682 extern int ext4_search_dir(struct buffer_head *bh,
2683                            char *search_buf,
2684                            int buf_size,
2685                            struct inode *dir,
2686                            struct ext4_filename *fname,
2687                            unsigned int offset,
2688                            struct ext4_dir_entry_2 **res_dir);
2689 extern int ext4_generic_delete_entry(handle_t *handle,
2690                                      struct inode *dir,
2691                                      struct ext4_dir_entry_2 *de_del,
2692                                      struct buffer_head *bh,
2693                                      void *entry_buf,
2694                                      int buf_size,
2695                                      int csum_size);
2696 extern bool ext4_empty_dir(struct inode *inode);
2697
2698 /* resize.c */
2699 extern void ext4_kvfree_array_rcu(void *to_free);
2700 extern int ext4_group_add(struct super_block *sb,
2701                                 struct ext4_new_group_data *input);
2702 extern int ext4_group_extend(struct super_block *sb,
2703                                 struct ext4_super_block *es,
2704                                 ext4_fsblk_t n_blocks_count);
2705 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2706
2707 /* super.c */
2708 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2709                                          sector_t block, int op_flags);
2710 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2711 extern int ext4_calculate_overhead(struct super_block *sb);
2712 extern void ext4_superblock_csum_set(struct super_block *sb);
2713 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2714 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2715 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2716                                     ext4_group_t ngroup);
2717 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2718                                      char nbuf[16]);
2719 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2720                                              ext4_group_t block_group,
2721                                              unsigned int flags);
2722
2723 extern __printf(4, 5)
2724 void __ext4_error(struct super_block *, const char *, unsigned int,
2725                   const char *, ...);
2726 extern __printf(5, 6)
2727 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2728                       const char *, ...);
2729 extern __printf(5, 6)
2730 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2731                      const char *, ...);
2732 extern void __ext4_std_error(struct super_block *, const char *,
2733                              unsigned int, int);
2734 extern __printf(4, 5)
2735 void __ext4_abort(struct super_block *, const char *, unsigned int,
2736                   const char *, ...);
2737 extern __printf(4, 5)
2738 void __ext4_warning(struct super_block *, const char *, unsigned int,
2739                     const char *, ...);
2740 extern __printf(4, 5)
2741 void __ext4_warning_inode(const struct inode *inode, const char *function,
2742                           unsigned int line, const char *fmt, ...);
2743 extern __printf(3, 4)
2744 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2745 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2746                            const char *, unsigned int, const char *);
2747 extern __printf(7, 8)
2748 void __ext4_grp_locked_error(const char *, unsigned int,
2749                              struct super_block *, ext4_group_t,
2750                              unsigned long, ext4_fsblk_t,
2751                              const char *, ...);
2752
2753 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2754         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2755
2756 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2757         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2758
2759 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2760         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2761
2762 #ifdef CONFIG_PRINTK
2763
2764 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2765         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2766 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2767         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2768 #define ext4_error(sb, fmt, ...)                                        \
2769         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2770 #define ext4_abort(sb, fmt, ...)                                        \
2771         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2772 #define ext4_warning(sb, fmt, ...)                                      \
2773         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2774 #define ext4_warning_inode(inode, fmt, ...)                             \
2775         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2776 #define ext4_msg(sb, level, fmt, ...)                           \
2777         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2778 #define dump_mmp_msg(sb, mmp, msg)                                      \
2779         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2780 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2781         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2782                                 fmt, ##__VA_ARGS__)
2783
2784 #else
2785
2786 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2787 do {                                                                    \
2788         no_printk(fmt, ##__VA_ARGS__);                                  \
2789         __ext4_error_inode(inode, "", 0, block, " ");                   \
2790 } while (0)
2791 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2792 do {                                                                    \
2793         no_printk(fmt, ##__VA_ARGS__);                                  \
2794         __ext4_error_file(file, "", 0, block, " ");                     \
2795 } while (0)
2796 #define ext4_error(sb, fmt, ...)                                        \
2797 do {                                                                    \
2798         no_printk(fmt, ##__VA_ARGS__);                                  \
2799         __ext4_error(sb, "", 0, " ");                                   \
2800 } while (0)
2801 #define ext4_abort(sb, fmt, ...)                                        \
2802 do {                                                                    \
2803         no_printk(fmt, ##__VA_ARGS__);                                  \
2804         __ext4_abort(sb, "", 0, " ");                                   \
2805 } while (0)
2806 #define ext4_warning(sb, fmt, ...)                                      \
2807 do {                                                                    \
2808         no_printk(fmt, ##__VA_ARGS__);                                  \
2809         __ext4_warning(sb, "", 0, " ");                                 \
2810 } while (0)
2811 #define ext4_warning_inode(inode, fmt, ...)                             \
2812 do {                                                                    \
2813         no_printk(fmt, ##__VA_ARGS__);                                  \
2814         __ext4_warning_inode(inode, "", 0, " ");                        \
2815 } while (0)
2816 #define ext4_msg(sb, level, fmt, ...)                                   \
2817 do {                                                                    \
2818         no_printk(fmt, ##__VA_ARGS__);                                  \
2819         __ext4_msg(sb, "", " ");                                        \
2820 } while (0)
2821 #define dump_mmp_msg(sb, mmp, msg)                                      \
2822         __dump_mmp_msg(sb, mmp, "", 0, "")
2823 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2824 do {                                                                    \
2825         no_printk(fmt, ##__VA_ARGS__);                          \
2826         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2827 } while (0)
2828
2829 #endif
2830
2831 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2832                                         __u32 compat);
2833 extern int ext4_update_rocompat_feature(handle_t *handle,
2834                                         struct super_block *sb, __u32 rocompat);
2835 extern int ext4_update_incompat_feature(handle_t *handle,
2836                                         struct super_block *sb, __u32 incompat);
2837 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2838                                       struct ext4_group_desc *bg);
2839 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2840                                       struct ext4_group_desc *bg);
2841 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2842                                      struct ext4_group_desc *bg);
2843 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2844                                       struct ext4_group_desc *bg);
2845 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2846                                  struct ext4_group_desc *bg);
2847 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2848                                 struct ext4_group_desc *bg);
2849 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2850                                    struct ext4_group_desc *bg);
2851 extern void ext4_block_bitmap_set(struct super_block *sb,
2852                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2853 extern void ext4_inode_bitmap_set(struct super_block *sb,
2854                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2855 extern void ext4_inode_table_set(struct super_block *sb,
2856                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2857 extern void ext4_free_group_clusters_set(struct super_block *sb,
2858                                          struct ext4_group_desc *bg,
2859                                          __u32 count);
2860 extern void ext4_free_inodes_set(struct super_block *sb,
2861                                 struct ext4_group_desc *bg, __u32 count);
2862 extern void ext4_used_dirs_set(struct super_block *sb,
2863                                 struct ext4_group_desc *bg, __u32 count);
2864 extern void ext4_itable_unused_set(struct super_block *sb,
2865                                    struct ext4_group_desc *bg, __u32 count);
2866 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2867                                        struct ext4_group_desc *gdp);
2868 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2869                                      struct ext4_group_desc *gdp);
2870 extern int ext4_register_li_request(struct super_block *sb,
2871                                     ext4_group_t first_not_zeroed);
2872
2873 static inline int ext4_has_metadata_csum(struct super_block *sb)
2874 {
2875         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2876                      !EXT4_SB(sb)->s_chksum_driver);
2877
2878         return ext4_has_feature_metadata_csum(sb) &&
2879                (EXT4_SB(sb)->s_chksum_driver != NULL);
2880 }
2881
2882 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2883 {
2884         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2885 }
2886
2887 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2888 {
2889         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2890                 le32_to_cpu(es->s_blocks_count_lo);
2891 }
2892
2893 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2894 {
2895         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2896                 le32_to_cpu(es->s_r_blocks_count_lo);
2897 }
2898
2899 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2900 {
2901         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2902                 le32_to_cpu(es->s_free_blocks_count_lo);
2903 }
2904
2905 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2906                                          ext4_fsblk_t blk)
2907 {
2908         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2909         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2910 }
2911
2912 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2913                                               ext4_fsblk_t blk)
2914 {
2915         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2916         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2917 }
2918
2919 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2920                                            ext4_fsblk_t blk)
2921 {
2922         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2923         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2924 }
2925
2926 static inline loff_t ext4_isize(struct super_block *sb,
2927                                 struct ext4_inode *raw_inode)
2928 {
2929         if (ext4_has_feature_largedir(sb) ||
2930             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2931                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2932                         le32_to_cpu(raw_inode->i_size_lo);
2933
2934         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2935 }
2936
2937 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2938 {
2939         raw_inode->i_size_lo = cpu_to_le32(i_size);
2940         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2941 }
2942
2943 static inline
2944 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2945                                             ext4_group_t group)
2946 {
2947          struct ext4_group_info **grp_info;
2948          long indexv, indexh;
2949          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2950          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2951          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2952          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
2953          return grp_info[indexh];
2954 }
2955
2956 /*
2957  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2958  * the locking protocol documented in the comments of ext4_group_add()
2959  * in resize.c
2960  */
2961 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2962 {
2963         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2964
2965         smp_rmb();
2966         return ngroups;
2967 }
2968
2969 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2970                                              ext4_group_t block_group)
2971 {
2972         return block_group >> sbi->s_log_groups_per_flex;
2973 }
2974
2975 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2976 {
2977         return 1 << sbi->s_log_groups_per_flex;
2978 }
2979
2980 #define ext4_std_error(sb, errno)                               \
2981 do {                                                            \
2982         if ((errno))                                            \
2983                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2984 } while (0)
2985
2986 #ifdef CONFIG_SMP
2987 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2988  * counters. So we need to make sure we have free clusters more
2989  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2990  */
2991 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2992 #else
2993 #define EXT4_FREECLUSTERS_WATERMARK 0
2994 #endif
2995
2996 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2997 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2998 {
2999         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3000                      !inode_is_locked(inode));
3001         down_write(&EXT4_I(inode)->i_data_sem);
3002         if (newsize > EXT4_I(inode)->i_disksize)
3003                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3004         up_write(&EXT4_I(inode)->i_data_sem);
3005 }
3006
3007 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3008 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3009 {
3010         int changed = 0;
3011
3012         if (newsize > inode->i_size) {
3013                 i_size_write(inode, newsize);
3014                 changed = 1;
3015         }
3016         if (newsize > EXT4_I(inode)->i_disksize) {
3017                 ext4_update_i_disksize(inode, newsize);
3018                 changed |= 2;
3019         }
3020         return changed;
3021 }
3022
3023 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3024                                       loff_t len);
3025
3026 struct ext4_group_info {
3027         unsigned long   bb_state;
3028         struct rb_root  bb_free_root;
3029         ext4_grpblk_t   bb_first_free;  /* first free block */
3030         ext4_grpblk_t   bb_free;        /* total free blocks */
3031         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3032         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3033         struct          list_head bb_prealloc_list;
3034 #ifdef DOUBLE_CHECK
3035         void            *bb_bitmap;
3036 #endif
3037         struct rw_semaphore alloc_sem;
3038         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3039                                          * regions, index is order.
3040                                          * bb_counters[3] = 5 means
3041                                          * 5 free 8-block regions. */
3042 };
3043
3044 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3045 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3046 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3047 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3048 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3049         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3050 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3051         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3052
3053 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3054         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3055 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3056         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3057 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3058         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3059
3060 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3061         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3062 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3063         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3064 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3065         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3066
3067 #define EXT4_MAX_CONTENTION             8
3068 #define EXT4_CONTENTION_THRESHOLD       2
3069
3070 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3071                                               ext4_group_t group)
3072 {
3073         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3074 }
3075
3076 /*
3077  * Returns true if the filesystem is busy enough that attempts to
3078  * access the block group locks has run into contention.
3079  */
3080 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3081 {
3082         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3083 }
3084
3085 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3086 {
3087         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3088         if (spin_trylock(lock))
3089                 /*
3090                  * We're able to grab the lock right away, so drop the
3091                  * lock contention counter.
3092                  */
3093                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3094         else {
3095                 /*
3096                  * The lock is busy, so bump the contention counter,
3097                  * and then wait on the spin lock.
3098                  */
3099                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3100                                   EXT4_MAX_CONTENTION);
3101                 spin_lock(lock);
3102         }
3103 }
3104
3105 static inline void ext4_unlock_group(struct super_block *sb,
3106                                         ext4_group_t group)
3107 {
3108         spin_unlock(ext4_group_lock_ptr(sb, group));
3109 }
3110
3111 /*
3112  * Block validity checking
3113  */
3114 #define ext4_check_indirect_blockref(inode, bh)                         \
3115         ext4_check_blockref(__func__, __LINE__, inode,                  \
3116                             (__le32 *)(bh)->b_data,                     \
3117                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3118
3119 #define ext4_ind_check_inode(inode)                                     \
3120         ext4_check_blockref(__func__, __LINE__, inode,                  \
3121                             EXT4_I(inode)->i_data,                      \
3122                             EXT4_NDIR_BLOCKS)
3123
3124 /*
3125  * Inodes and files operations
3126  */
3127
3128 /* dir.c */
3129 extern const struct file_operations ext4_dir_operations;
3130
3131 #ifdef CONFIG_UNICODE
3132 extern const struct dentry_operations ext4_dentry_ops;
3133 #endif
3134
3135 /* file.c */
3136 extern const struct inode_operations ext4_file_inode_operations;
3137 extern const struct file_operations ext4_file_operations;
3138 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3139
3140 /* inline.c */
3141 extern int ext4_get_max_inline_size(struct inode *inode);
3142 extern int ext4_find_inline_data_nolock(struct inode *inode);
3143 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3144                                  unsigned int len);
3145 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3146
3147 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3148 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3149                                          struct inode *inode,
3150                                          loff_t pos, unsigned len,
3151                                          unsigned flags,
3152                                          struct page **pagep);
3153 extern int ext4_write_inline_data_end(struct inode *inode,
3154                                       loff_t pos, unsigned len,
3155                                       unsigned copied,
3156                                       struct page *page);
3157 extern struct buffer_head *
3158 ext4_journalled_write_inline_data(struct inode *inode,
3159                                   unsigned len,
3160                                   struct page *page);
3161 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3162                                            struct inode *inode,
3163                                            loff_t pos, unsigned len,
3164                                            unsigned flags,
3165                                            struct page **pagep,
3166                                            void **fsdata);
3167 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3168                                          unsigned len, unsigned copied,
3169                                          struct page *page);
3170 extern int ext4_try_add_inline_entry(handle_t *handle,
3171                                      struct ext4_filename *fname,
3172                                      struct inode *dir, struct inode *inode);
3173 extern int ext4_try_create_inline_dir(handle_t *handle,
3174                                       struct inode *parent,
3175                                       struct inode *inode);
3176 extern int ext4_read_inline_dir(struct file *filp,
3177                                 struct dir_context *ctx,
3178                                 int *has_inline_data);
3179 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3180                                   struct inode *dir, ext4_lblk_t block,
3181                                   struct dx_hash_info *hinfo,
3182                                   __u32 start_hash, __u32 start_minor_hash,
3183                                   int *has_inline_data);
3184 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3185                                         struct ext4_filename *fname,
3186                                         struct ext4_dir_entry_2 **res_dir,
3187                                         int *has_inline_data);
3188 extern int ext4_delete_inline_entry(handle_t *handle,
3189                                     struct inode *dir,
3190                                     struct ext4_dir_entry_2 *de_del,
3191                                     struct buffer_head *bh,
3192                                     int *has_inline_data);
3193 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3194 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3195                                         struct ext4_dir_entry_2 **parent_de,
3196                                         int *retval);
3197 extern int ext4_inline_data_fiemap(struct inode *inode,
3198                                    struct fiemap_extent_info *fieinfo,
3199                                    int *has_inline, __u64 start, __u64 len);
3200
3201 struct iomap;
3202 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3203
3204 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3205
3206 extern int ext4_convert_inline_data(struct inode *inode);
3207
3208 static inline int ext4_has_inline_data(struct inode *inode)
3209 {
3210         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3211                EXT4_I(inode)->i_inline_off;
3212 }
3213
3214 /* namei.c */
3215 extern const struct inode_operations ext4_dir_inode_operations;
3216 extern const struct inode_operations ext4_special_inode_operations;
3217 extern struct dentry *ext4_get_parent(struct dentry *child);
3218 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3219                                  struct ext4_dir_entry_2 *de,
3220                                  int blocksize, int csum_size,
3221                                  unsigned int parent_ino, int dotdot_real_len);
3222 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3223                                         unsigned int blocksize);
3224 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3225                                       struct buffer_head *bh);
3226 extern int ext4_ci_compare(const struct inode *parent,
3227                            const struct qstr *fname,
3228                            const struct qstr *entry, bool quick);
3229
3230 #define S_SHIFT 12
3231 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3232         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3233         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3234         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3235         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3236         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3237         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3238         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3239 };
3240
3241 static inline void ext4_set_de_type(struct super_block *sb,
3242                                 struct ext4_dir_entry_2 *de,
3243                                 umode_t mode) {
3244         if (ext4_has_feature_filetype(sb))
3245                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3246 }
3247
3248 /* readpages.c */
3249 extern int ext4_mpage_readpages(struct address_space *mapping,
3250                                 struct list_head *pages, struct page *page,
3251                                 unsigned nr_pages, bool is_readahead);
3252 extern int __init ext4_init_post_read_processing(void);
3253 extern void ext4_exit_post_read_processing(void);
3254
3255 /* symlink.c */
3256 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3257 extern const struct inode_operations ext4_symlink_inode_operations;
3258 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3259
3260 /* sysfs.c */
3261 extern int ext4_register_sysfs(struct super_block *sb);
3262 extern void ext4_unregister_sysfs(struct super_block *sb);
3263 extern int __init ext4_init_sysfs(void);
3264 extern void ext4_exit_sysfs(void);
3265
3266 /* block_validity */
3267 extern void ext4_release_system_zone(struct super_block *sb);
3268 extern int ext4_setup_system_zone(struct super_block *sb);
3269 extern int __init ext4_init_system_zone(void);
3270 extern void ext4_exit_system_zone(void);
3271 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3272                                  ext4_fsblk_t start_blk,
3273                                  unsigned int count);
3274 extern int ext4_check_blockref(const char *, unsigned int,
3275                                struct inode *, __le32 *, unsigned int);
3276
3277 /* extents.c */
3278 struct ext4_ext_path;
3279 struct ext4_extent;
3280
3281 /*
3282  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3283  * __le32.
3284  */
3285 #define EXT_MAX_BLOCKS  0xffffffff
3286
3287 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3288 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3289 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3290 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3291                                struct ext4_map_blocks *map, int flags);
3292 extern int ext4_ext_truncate(handle_t *, struct inode *);
3293 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3294                                  ext4_lblk_t end);
3295 extern void ext4_ext_init(struct super_block *);
3296 extern void ext4_ext_release(struct super_block *);
3297 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3298                           loff_t len);
3299 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3300                                           loff_t offset, ssize_t len);
3301 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3302                            struct ext4_map_blocks *map, int flags);
3303 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3304                                          ext4_lblk_t lblocks);
3305 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3306                                                    int num,
3307                                                    struct ext4_ext_path *path);
3308 extern int ext4_can_extents_be_merged(struct inode *inode,
3309                                       struct ext4_extent *ex1,
3310                                       struct ext4_extent *ex2);
3311 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3312                                   struct ext4_ext_path **,
3313                                   struct ext4_extent *, int);
3314 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3315                                               struct ext4_ext_path **,
3316                                               int flags);
3317 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3318 extern int ext4_ext_check_inode(struct inode *inode);
3319 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3320 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3321                         __u64 start, __u64 len);
3322 extern int ext4_get_es_cache(struct inode *inode,
3323                              struct fiemap_extent_info *fieinfo,
3324                              __u64 start, __u64 len);
3325 extern int ext4_ext_precache(struct inode *inode);
3326 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3327 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3328 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3329                                 struct inode *inode2, ext4_lblk_t lblk1,
3330                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3331                              int mark_unwritten,int *err);
3332 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3333
3334 /* move_extent.c */
3335 extern void ext4_double_down_write_data_sem(struct inode *first,
3336                                             struct inode *second);
3337 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3338                                           struct inode *donor_inode);
3339 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3340                              __u64 start_orig, __u64 start_donor,
3341                              __u64 len, __u64 *moved_len);
3342
3343 /* page-io.c */
3344 extern int __init ext4_init_pageio(void);
3345 extern void ext4_exit_pageio(void);
3346 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3347 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3348 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3349 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3350 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3351                                 struct writeback_control *wbc);
3352 extern void ext4_end_io_rsv_work(struct work_struct *work);
3353 extern void ext4_io_submit(struct ext4_io_submit *io);
3354 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3355                                struct page *page,
3356                                int len,
3357                                struct writeback_control *wbc,
3358                                bool keep_towrite);
3359
3360 /* mmp.c */
3361 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3362
3363 /* verity.c */
3364 extern const struct fsverity_operations ext4_verityops;
3365
3366 /*
3367  * Add new method to test whether block and inode bitmaps are properly
3368  * initialized. With uninit_bg reading the block from disk is not enough
3369  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3370  */
3371 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3372
3373 static inline int bitmap_uptodate(struct buffer_head *bh)
3374 {
3375         return (buffer_uptodate(bh) &&
3376                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3377 }
3378 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3379 {
3380         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3381 }
3382
3383 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3384
3385 /* For ioend & aio unwritten conversion wait queues */
3386 #define EXT4_WQ_HASH_SZ         37
3387 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3388                                             EXT4_WQ_HASH_SZ])
3389 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3390
3391 extern int ext4_resize_begin(struct super_block *sb);
3392 extern void ext4_resize_end(struct super_block *sb);
3393
3394 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3395                                               struct ext4_io_end *io_end)
3396 {
3397         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3398                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3399                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3400         }
3401 }
3402
3403 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3404 {
3405         struct inode *inode = io_end->inode;
3406
3407         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3408                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3409                 /* Wake up anyone waiting on unwritten extent conversion */
3410                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3411                         wake_up_all(ext4_ioend_wq(inode));
3412         }
3413 }
3414
3415 extern const struct iomap_ops ext4_iomap_ops;
3416
3417 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3418 {
3419         /*
3420          * If the buffer has the write error flag, we have failed
3421          * to write out data in the block.  In this  case, we don't
3422          * have to read the block because we may read the old data
3423          * successfully.
3424          */
3425         if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3426                 set_buffer_uptodate(bh);
3427         return buffer_uptodate(bh);
3428 }
3429
3430 #endif  /* __KERNEL__ */
3431
3432 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3433 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3434
3435 #endif  /* _EXT4_H */