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
  45 #include <linux/compiler.h>
  46
  47 /*
  48  * The fourth extended filesystem constants/structures
  49  */
  50
  51 /*
  52  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  53  * structures. these checks slow things down a lot
  54  */
  55 #define AGGRESSIVE_CHECK__
  56
  57 /*
  58  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  59  * bitmaps, maintains and uses them to check for double allocations
  60  */
  61 #define DOUBLE_CHECK__
  62
  63 /*
  64  * Define EXT4FS_DEBUG to produce debug messages
  65  */
  66 #undef EXT4FS_DEBUG
  67
  68 /*
  69  * Debug code
  70  */
  71 #ifdef EXT4FS_DEBUG
  72 #define ext4_debug(f, a...)                                             \
  73         do {                                                            \
  74                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  75                         __FILE__, __LINE__, __func__);                  \
  76                 printk(KERN_DEBUG f, ## a);                             \
  77         } while (0)
  78 #else
  79 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  80 #endif
  81
  82 /*
  83  * Turn on EXT_DEBUG to get lots of info about extents operations.
  84  */
  85 #define EXT_DEBUG__
  86 #ifdef EXT_DEBUG
  87 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  88 #else
  89 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  90 #endif
  91
  92 /* data type for block offset of block group */
  93 typedef int ext4_grpblk_t;
  94
  95 /* data type for filesystem-wide blocks number */
  96 typedef unsigned long long ext4_fsblk_t;
  97
  98 /* data type for file logical block number */
  99 typedef __u32 ext4_lblk_t;
 100
 101 /* data type for block group number */
 102 typedef unsigned int ext4_group_t;
 103
 104 enum SHIFT_DIRECTION {
 105         SHIFT_LEFT = 0,
 106         SHIFT_RIGHT,
 107 };
 108
 109 /*
 110  * Flags used in mballoc's allocation_context flags field.
 111  *
 112  * Also used to show what's going on for debugging purposes when the
 113  * flag field is exported via the traceport interface
 114  */
 115
 116 /* prefer goal again. length */
 117 #define EXT4_MB_HINT_MERGE              0x0001
 118 /* blocks already reserved */
 119 #define EXT4_MB_HINT_RESERVED           0x0002
 120 /* metadata is being allocated */
 121 #define EXT4_MB_HINT_METADATA           0x0004
 122 /* first blocks in the file */
 123 #define EXT4_MB_HINT_FIRST              0x0008
 124 /* search for the best chunk */
 125 #define EXT4_MB_HINT_BEST               0x0010
 126 /* data is being allocated */
 127 #define EXT4_MB_HINT_DATA               0x0020
 128 /* don't preallocate (for tails) */
 129 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 130 /* allocate for locality group */
 131 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 132 /* allocate goal blocks or none */
 133 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 134 /* goal is meaningful */
 135 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 136 /* blocks already pre-reserved by delayed allocation */
 137 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 138 /* We are doing stream allocation */
 139 #define EXT4_MB_STREAM_ALLOC            0x0800
 140 /* Use reserved root blocks if needed */
 141 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 142 /* Use blocks from reserved pool */
 143 #define EXT4_MB_USE_RESERVED            0x2000
 144
 145 struct ext4_allocation_request {
 146         /* target inode for block we're allocating */
 147         struct inode *inode;
 148         /* how many blocks we want to allocate */
 149         unsigned int len;
 150         /* logical block in target inode */
 151         ext4_lblk_t logical;
 152         /* the closest logical allocated block to the left */
 153         ext4_lblk_t lleft;
 154         /* the closest logical allocated block to the right */
 155         ext4_lblk_t lright;
 156         /* phys. target (a hint) */
 157         ext4_fsblk_t goal;
 158         /* phys. block for the closest logical allocated block to the left */
 159         ext4_fsblk_t pleft;
 160         /* phys. block for the closest logical allocated block to the right */
 161         ext4_fsblk_t pright;
 162         /* flags. see above EXT4_MB_HINT_* */
 163         unsigned int flags;
 164 };
 165
 166 /*
 167  * Logical to physical block mapping, used by ext4_map_blocks()
 168  *
 169  * This structure is used to pass requests into ext4_map_blocks() as
 170  * well as to store the information returned by ext4_map_blocks().  It
 171  * takes less room on the stack than a struct buffer_head.
 172  */
 173 #define EXT4_MAP_NEW            (1 << BH_New)
 174 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 175 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 176 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 177 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 178                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 179
 180 struct ext4_map_blocks {
 181         ext4_fsblk_t m_pblk;
 182         ext4_lblk_t m_lblk;
 183         unsigned int m_len;
 184         unsigned int m_flags;
 185 };
 186
 187 /*
 188  * Flags for ext4_io_end->flags
 189  */
 190 #define EXT4_IO_END_UNWRITTEN   0x0001
 191
 192 /*
 193  * For converting unwritten extents on a work queue. 'handle' is used for
 194  * buffered writeback.
 195  */
 196 typedef struct ext4_io_end {
 197         struct list_head        list;           /* per-file finished IO list */
 198         handle_t                *handle;        /* handle reserved for extent
 199                                                  * conversion */
 200         struct inode            *inode;         /* file being written to */
 201         struct bio              *bio;           /* Linked list of completed
 202                                                  * bios covering the extent */
 203         unsigned int            flag;           /* unwritten or not */
 204         atomic_t                count;          /* reference counter */
 205         loff_t                  offset;         /* offset in the file */
 206         ssize_t                 size;           /* size of the extent */
 207 } ext4_io_end_t;
 208
 209 struct ext4_io_submit {
 210         struct writeback_control *io_wbc;
 211         struct bio              *io_bio;
 212         ext4_io_end_t           *io_end;
 213         sector_t                io_next_block;
 214 };
 215
 216 /*
 217  * Special inodes numbers
 218  */
 219 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 220 #define EXT4_ROOT_INO            2      /* Root inode */
 221 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 222 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 223 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 224 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 225 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 226 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 227
 228 /* First non-reserved inode for old ext4 filesystems */
 229 #define EXT4_GOOD_OLD_FIRST_INO 11
 230
 231 /*
 232  * Maximal count of links to a file
 233  */
 234 #define EXT4_LINK_MAX           65000
 235
 236 /*
 237  * Macro-instructions used to manage several block sizes
 238  */
 239 #define EXT4_MIN_BLOCK_SIZE             1024
 240 #define EXT4_MAX_BLOCK_SIZE             65536
 241 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 242 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 243 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 244 #ifdef __KERNEL__
 245 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 246 #else
 247 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 248 #endif
 249 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 250 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 251                                          EXT4_SB(s)->s_cluster_bits)
 252 #ifdef __KERNEL__
 253 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 254 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 255 #else
 256 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 257 #endif
 258 #ifdef __KERNEL__
 259 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 260 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 261 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 262 #else
 263 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 264                                  EXT4_GOOD_OLD_INODE_SIZE : \
 265                                  (s)->s_inode_size)
 266 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 267                                  EXT4_GOOD_OLD_FIRST_INO : \
 268                                  (s)->s_first_ino)
 269 #endif
 270 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 271 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 272         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 273                                                                   blkbits))
 274
 275 /* Translate a block number to a cluster number */
 276 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 277 /* Translate a cluster number to a block number */
 278 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 279 /* Translate # of blks to # of clusters */
 280 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 281                                  (sbi)->s_cluster_bits)
 282 /* Mask out the low bits to get the starting block of the cluster */
 283 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 284                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 285 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 286                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 287 /* Get the cluster offset */
 288 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 289                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 290 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 291                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 292
 293 /*
 294  * Structure of a blocks group descriptor
 295  */
 296 struct ext4_group_desc
 297 {
 298         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 299         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 300         __le32  bg_inode_table_lo;      /* Inodes table block */
 301         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 302         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 303         __le16  bg_used_dirs_count_lo;  /* Directories count */
 304         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 305         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 306         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 307         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 308         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 309         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 310         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 311         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 312         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 313         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 314         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 315         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 316         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 317         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 318         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 319         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 320         __u32   bg_reserved;
 321 };
 322
 323 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 324         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 325          sizeof(__le16))
 326 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 327         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 328          sizeof(__le16))
 329
 330 /*
 331  * Structure of a flex block group info
 332  */
 333
 334 struct flex_groups {
 335         atomic64_t      free_clusters;
 336         atomic_t        free_inodes;
 337         atomic_t        used_dirs;
 338 };
 339
 340 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 341 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 342 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 343
 344 /*
 345  * Macro-instructions used to manage group descriptors
 346  */
 347 #define EXT4_MIN_DESC_SIZE              32
 348 #define EXT4_MIN_DESC_SIZE_64BIT        64
 349 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 350 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 351 #ifdef __KERNEL__
 352 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 353 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 354 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 355 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 356 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 357 #else
 358 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 359 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 360 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 361 #endif
 362
 363 /*
 364  * Constants relative to the data blocks
 365  */
 366 #define EXT4_NDIR_BLOCKS                12
 367 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 368 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 369 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 370 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 371
 372 /*
 373  * Inode flags
 374  */
 375 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 376 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 377 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 378 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 379 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 380 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 381 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 382 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 383 /* Reserved for compression usage... */
 384 #define EXT4_DIRTY_FL                   0x00000100
 385 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 386 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 387         /* nb: was previously EXT2_ECOMPR_FL */
 388 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 389 /* End compression flags --- maybe not all used */
 390 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 391 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 392 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 393 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 394 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 395 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 396 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 397 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 398 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 399 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 400 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 401 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 402 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 403
 404 #define EXT4_FL_USER_VISIBLE            0x304BDFFF /* User visible flags */
 405 #define EXT4_FL_USER_MODIFIABLE         0x204BC0FF /* User modifiable flags */
 406
 407 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 408 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 409                                          EXT4_IMMUTABLE_FL | \
 410                                          EXT4_APPEND_FL | \
 411                                          EXT4_NODUMP_FL | \
 412                                          EXT4_NOATIME_FL | \
 413                                          EXT4_PROJINHERIT_FL)
 414
 415 /* Flags that should be inherited by new inodes from their parent. */
 416 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 417                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 418                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 419                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 420                            EXT4_PROJINHERIT_FL)
 421
 422 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 423 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 424
 425 /* Flags that are appropriate for non-directories/regular files. */
 426 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 427
 428 /* The only flags that should be swapped */
 429 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 430
 431 /* Mask out flags that are inappropriate for the given type of inode. */
 432 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 433 {
 434         if (S_ISDIR(mode))
 435                 return flags;
 436         else if (S_ISREG(mode))
 437                 return flags & EXT4_REG_FLMASK;
 438         else
 439                 return flags & EXT4_OTHER_FLMASK;
 440 }
 441
 442 /*
 443  * Inode flags used for atomic set/get
 444  */
 445 enum {
 446         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 447         EXT4_INODE_UNRM         = 1,    /* Undelete */
 448         EXT4_INODE_COMPR        = 2,    /* Compress file */
 449         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 450         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 451         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 452         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 453         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 454 /* Reserved for compression usage... */
 455         EXT4_INODE_DIRTY        = 8,
 456         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 457         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 458         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 459 /* End compression flags --- maybe not all used */
 460         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 461         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 462         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 463         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 464         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 465         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 466         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 467         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 468         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 469         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 470         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 471         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 472         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 473 };
 474
 475 /*
 476  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 477  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 478  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 479  * any extra space in the compiled kernel image, otherwise, the build will fail.
 480  * It's important that these values are the same, since we are using
 481  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 482  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 483  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 484  * defined in e2fsprogs.
 485  *
 486  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 487  */
 488 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 489 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 490
 491 static inline void ext4_check_flag_values(void)
 492 {
 493         CHECK_FLAG_VALUE(SECRM);
 494         CHECK_FLAG_VALUE(UNRM);
 495         CHECK_FLAG_VALUE(COMPR);
 496         CHECK_FLAG_VALUE(SYNC);
 497         CHECK_FLAG_VALUE(IMMUTABLE);
 498         CHECK_FLAG_VALUE(APPEND);
 499         CHECK_FLAG_VALUE(NODUMP);
 500         CHECK_FLAG_VALUE(NOATIME);
 501         CHECK_FLAG_VALUE(DIRTY);
 502         CHECK_FLAG_VALUE(COMPRBLK);
 503         CHECK_FLAG_VALUE(NOCOMPR);
 504         CHECK_FLAG_VALUE(ENCRYPT);
 505         CHECK_FLAG_VALUE(INDEX);
 506         CHECK_FLAG_VALUE(IMAGIC);
 507         CHECK_FLAG_VALUE(JOURNAL_DATA);
 508         CHECK_FLAG_VALUE(NOTAIL);
 509         CHECK_FLAG_VALUE(DIRSYNC);
 510         CHECK_FLAG_VALUE(TOPDIR);
 511         CHECK_FLAG_VALUE(HUGE_FILE);
 512         CHECK_FLAG_VALUE(EXTENTS);
 513         CHECK_FLAG_VALUE(EA_INODE);
 514         CHECK_FLAG_VALUE(EOFBLOCKS);
 515         CHECK_FLAG_VALUE(INLINE_DATA);
 516         CHECK_FLAG_VALUE(PROJINHERIT);
 517         CHECK_FLAG_VALUE(RESERVED);
 518 }
 519
 520 /* Used to pass group descriptor data when online resize is done */
 521 struct ext4_new_group_input {
 522         __u32 group;            /* Group number for this data */
 523         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 524         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 525         __u64 inode_table;      /* Absolute block number of inode table start */
 526         __u32 blocks_count;     /* Total number of blocks in this group */
 527         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 528         __u16 unused;
 529 };
 530
 531 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 532 struct compat_ext4_new_group_input {
 533         u32 group;
 534         compat_u64 block_bitmap;
 535         compat_u64 inode_bitmap;
 536         compat_u64 inode_table;
 537         u32 blocks_count;
 538         u16 reserved_blocks;
 539         u16 unused;
 540 };
 541 #endif
 542
 543 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 544 struct ext4_new_group_data {
 545         __u32 group;
 546         __u64 block_bitmap;
 547         __u64 inode_bitmap;
 548         __u64 inode_table;
 549         __u32 blocks_count;
 550         __u16 reserved_blocks;
 551         __u16 mdata_blocks;
 552         __u32 free_clusters_count;
 553 };
 554
 555 /* Indexes used to index group tables in ext4_new_group_data */
 556 enum {
 557         BLOCK_BITMAP = 0,       /* block bitmap */
 558         INODE_BITMAP,           /* inode bitmap */
 559         INODE_TABLE,            /* inode tables */
 560         GROUP_TABLE_COUNT,
 561 };
 562
 563 /*
 564  * Flags used by ext4_map_blocks()
 565  */
 566         /* Allocate any needed blocks and/or convert an unwritten
 567            extent to be an initialized ext4 */
 568 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 569         /* Request the creation of an unwritten extent */
 570 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 571 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 572                                                  EXT4_GET_BLOCKS_CREATE)
 573         /* Caller is from the delayed allocation writeout path
 574          * finally doing the actual allocation of delayed blocks */
 575 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 576         /* caller is from the direct IO path, request to creation of an
 577         unwritten extents if not allocated, split the unwritten
 578         extent if blocks has been preallocated already*/
 579 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 580 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 581 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 582                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 583         /* Convert extent to initialized after IO complete */
 584 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 585                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 586         /* Eventual metadata allocation (due to growing extent tree)
 587          * should not fail, so try to use reserved blocks for that.*/
 588 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 589         /* Don't normalize allocation size (used for fallocate) */
 590 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 591         /* Request will not result in inode size update (user for fallocate) */
 592 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 593         /* Convert written extents to unwritten */
 594 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 595         /* Write zeros to newly created written extents */
 596 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 597 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 598                                         EXT4_GET_BLOCKS_ZERO)
 599         /* Caller will submit data before dropping transaction handle. This
 600          * allows jbd2 to avoid submitting data before commit. */
 601 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 602
 603 /*
 604  * The bit position of these flags must not overlap with any of the
 605  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 606  * read_extent_tree_block(), ext4_split_extent_at(),
 607  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 608  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 609  * caching the extents when reading from the extent tree while a
 610  * truncate or punch hole operation is in progress.
 611  */
 612 #define EXT4_EX_NOCACHE                         0x40000000
 613 #define EXT4_EX_FORCE_CACHE                     0x20000000
 614
 615 /*
 616  * Flags used by ext4_free_blocks
 617  */
 618 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 619 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 620 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 621 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 622 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 623 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 624 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 625
 626 /*
 627  * ioctl commands
 628  */
 629 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 630 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 631 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 632 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 633 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 634 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 635 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 636 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 637 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 638 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 639 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 640  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 641  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 642 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 643 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 644 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 645 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 646 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 647 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 648 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 649 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 650
 651 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 652 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 653
 654 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 655
 656 /*
 657  * Flags for going down operation
 658  */
 659 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 660 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 661 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 662
 663
 664 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 665 /*
 666  * ioctl commands in 32 bit emulation
 667  */
 668 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 669 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 670 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 671 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 672 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 673 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 674 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 675 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 676 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 677 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 678 #endif
 679
 680 /* Max physical block we can address w/o extents */
 681 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 682
 683 /* Max logical block we can support */
 684 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 685
 686 /*
 687  * Structure of an inode on the disk
 688  */
 689 struct ext4_inode {
 690         __le16  i_mode;         /* File mode */
 691         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 692         __le32  i_size_lo;      /* Size in bytes */
 693         __le32  i_atime;        /* Access time */
 694         __le32  i_ctime;        /* Inode Change time */
 695         __le32  i_mtime;        /* Modification time */
 696         __le32  i_dtime;        /* Deletion Time */
 697         __le16  i_gid;          /* Low 16 bits of Group Id */
 698         __le16  i_links_count;  /* Links count */
 699         __le32  i_blocks_lo;    /* Blocks count */
 700         __le32  i_flags;        /* File flags */
 701         union {
 702                 struct {
 703                         __le32  l_i_version;
 704                 } linux1;
 705                 struct {
 706                         __u32  h_i_translator;
 707                 } hurd1;
 708                 struct {
 709                         __u32  m_i_reserved1;
 710                 } masix1;
 711         } osd1;                         /* OS dependent 1 */
 712         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 713         __le32  i_generation;   /* File version (for NFS) */
 714         __le32  i_file_acl_lo;  /* File ACL */
 715         __le32  i_size_high;
 716         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 717         union {
 718                 struct {
 719                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 720                         __le16  l_i_file_acl_high;
 721                         __le16  l_i_uid_high;   /* these 2 fields */
 722                         __le16  l_i_gid_high;   /* were reserved2[0] */
 723                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 724                         __le16  l_i_reserved;
 725                 } linux2;
 726                 struct {
 727                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 728                         __u16   h_i_mode_high;
 729                         __u16   h_i_uid_high;
 730                         __u16   h_i_gid_high;
 731                         __u32   h_i_author;
 732                 } hurd2;
 733                 struct {
 734                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 735                         __le16  m_i_file_acl_high;
 736                         __u32   m_i_reserved2[2];
 737                 } masix2;
 738         } osd2;                         /* OS dependent 2 */
 739         __le16  i_extra_isize;
 740         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 741         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 742         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 743         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 744         __le32  i_crtime;       /* File Creation time */
 745         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 746         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 747         __le32  i_projid;       /* Project ID */
 748 };
 749
 750 struct move_extent {
 751         __u32 reserved;         /* should be zero */
 752         __u32 donor_fd;         /* donor file descriptor */
 753         __u64 orig_start;       /* logical start offset in block for orig */
 754         __u64 donor_start;      /* logical start offset in block for donor */
 755         __u64 len;              /* block length to be moved */
 756         __u64 moved_len;        /* moved block length */
 757 };
 758
 759 #define EXT4_EPOCH_BITS 2
 760 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 761 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 762
 763 /*
 764  * Extended fields will fit into an inode if the filesystem was formatted
 765  * with large inodes (-I 256 or larger) and there are not currently any EAs
 766  * consuming all of the available space. For new inodes we always reserve
 767  * enough space for the kernel's known extended fields, but for inodes
 768  * created with an old kernel this might not have been the case. None of
 769  * the extended inode fields is critical for correct filesystem operation.
 770  * This macro checks if a certain field fits in the inode. Note that
 771  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 772  */
 773 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 774         ((offsetof(typeof(*ext4_inode), field) +        \
 775           sizeof((ext4_inode)->field))                  \
 776         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 777             (einode)->i_extra_isize))                   \
 778
 779 /*
 780  * We use an encoding that preserves the times for extra epoch "00":
 781  *
 782  * extra  msb of                         adjust for signed
 783  * epoch  32-bit                         32-bit tv_sec to
 784  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 785  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 786  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 787  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 788  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 789  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 790  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 791  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 792  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 793  *
 794  * Note that previous versions of the kernel on 64-bit systems would
 795  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 796  * 1970.  e2fsck will correct this, assuming that it is run on the
 797  * affected filesystem before 2242.
 798  */
 799
 800 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 801 {
 802         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 803         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 804 }
 805
 806 static inline void ext4_decode_extra_time(struct timespec64 *time,
 807                                           __le32 extra)
 808 {
 809         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
 810
 811 #if 1
 812                 /* Handle legacy encoding of pre-1970 dates with epoch
 813                  * bits 1,1. (This backwards compatibility may be removed
 814                  * at the discretion of the ext4 developers.)
 815                  */
 816                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 817                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 818                         extra_bits = 0;
 819                 time->tv_sec += extra_bits << 32;
 820 #else
 821                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 822 #endif
 823         }
 824         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 825 }
 826
 827 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 828 do {                                                                            \
 829         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);                \
 830         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 831                 (raw_inode)->xtime ## _extra =                                  \
 832                                 ext4_encode_extra_time(&(inode)->xtime);        \
 833                 }                                                               \
 834 } while (0)
 835
 836 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 837 do {                                                                           \
 838         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 839                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 840         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 841                 (raw_inode)->xtime ## _extra =                                 \
 842                                 ext4_encode_extra_time(&(einode)->xtime);      \
 843 } while (0)
 844
 845 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 846 do {                                                                            \
 847         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 848         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 849                 ext4_decode_extra_time(&(inode)->xtime,                         \
 850                                        raw_inode->xtime ## _extra);             \
 851                 }                                                               \
 852         else                                                                    \
 853                 (inode)->xtime.tv_nsec = 0;                                     \
 854 } while (0)
 855
 856
 857 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 858 do {                                                                           \
 859         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 860                 (einode)->xtime.tv_sec =                                       \
 861                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 862         else                                                                   \
 863                 (einode)->xtime.tv_sec = 0;                                    \
 864         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 865                 ext4_decode_extra_time(&(einode)->xtime,                       \
 866                                        raw_inode->xtime ## _extra);            \
 867         else                                                                   \
 868                 (einode)->xtime.tv_nsec = 0;                                   \
 869 } while (0)
 870
 871 #define i_disk_version osd1.linux1.l_i_version
 872
 873 #if defined(__KERNEL__) || defined(__linux__)
 874 #define i_reserved1     osd1.linux1.l_i_reserved1
 875 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 876 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 877 #define i_uid_low       i_uid
 878 #define i_gid_low       i_gid
 879 #define i_uid_high      osd2.linux2.l_i_uid_high
 880 #define i_gid_high      osd2.linux2.l_i_gid_high
 881 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 882
 883 #elif defined(__GNU__)
 884
 885 #define i_translator    osd1.hurd1.h_i_translator
 886 #define i_uid_high      osd2.hurd2.h_i_uid_high
 887 #define i_gid_high      osd2.hurd2.h_i_gid_high
 888 #define i_author        osd2.hurd2.h_i_author
 889
 890 #elif defined(__masix__)
 891
 892 #define i_reserved1     osd1.masix1.m_i_reserved1
 893 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 894 #define i_reserved2     osd2.masix2.m_i_reserved2
 895
 896 #endif /* defined(__KERNEL__) || defined(__linux__) */
 897
 898 #include "extents_status.h"
 899
 900 /*
 901  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 902  *
 903  * These are needed to avoid lockdep false positives when we need to
 904  * allocate blocks to the quota inode during ext4_map_blocks(), while
 905  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 906  * do quota tracking for the quota inode, this avoids deadlock (as
 907  * well as infinite recursion, since it isn't turtles all the way
 908  * down...)
 909  *
 910  *  I_DATA_SEM_NORMAL - Used for most inodes
 911  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 912  *                        where the second inode has larger inode number
 913  *                        than the first
 914  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 915  */
 916 enum {
 917         I_DATA_SEM_NORMAL = 0,
 918         I_DATA_SEM_OTHER,
 919         I_DATA_SEM_QUOTA,
 920 };
 921
 922
 923 /*
 924  * fourth extended file system inode data in memory
 925  */
 926 struct ext4_inode_info {
 927         __le32  i_data[15];     /* unconverted */
 928         __u32   i_dtime;
 929         ext4_fsblk_t    i_file_acl;
 930
 931         /*
 932          * i_block_group is the number of the block group which contains
 933          * this file's inode.  Constant across the lifetime of the inode,
 934          * it is used for making block allocation decisions - we try to
 935          * place a file's data blocks near its inode block, and new inodes
 936          * near to their parent directory's inode.
 937          */
 938         ext4_group_t    i_block_group;
 939         ext4_lblk_t     i_dir_start_lookup;
 940 #if (BITS_PER_LONG < 64)
 941         unsigned long   i_state_flags;          /* Dynamic state flags */
 942 #endif
 943         unsigned long   i_flags;
 944
 945         /*
 946          * Extended attributes can be read independently of the main file
 947          * data. Taking i_mutex even when reading would cause contention
 948          * between readers of EAs and writers of regular file data, so
 949          * instead we synchronize on xattr_sem when reading or changing
 950          * EAs.
 951          */
 952         struct rw_semaphore xattr_sem;
 953
 954         struct list_head i_orphan;      /* unlinked but open inodes */
 955
 956         /*
 957          * i_disksize keeps track of what the inode size is ON DISK, not
 958          * in memory.  During truncate, i_size is set to the new size by
 959          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 960          * set i_disksize to 0 until the truncate is actually under way.
 961          *
 962          * The intent is that i_disksize always represents the blocks which
 963          * are used by this file.  This allows recovery to restart truncate
 964          * on orphans if we crash during truncate.  We actually write i_disksize
 965          * into the on-disk inode when writing inodes out, instead of i_size.
 966          *
 967          * The only time when i_disksize and i_size may be different is when
 968          * a truncate is in progress.  The only things which change i_disksize
 969          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 970          */
 971         loff_t  i_disksize;
 972
 973         /*
 974          * i_data_sem is for serialising ext4_truncate() against
 975          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 976          * data tree are chopped off during truncate. We can't do that in
 977          * ext4 because whenever we perform intermediate commits during
 978          * truncate, the inode and all the metadata blocks *must* be in a
 979          * consistent state which allows truncation of the orphans to restart
 980          * during recovery.  Hence we must fix the get_block-vs-truncate race
 981          * by other means, so we have i_data_sem.
 982          */
 983         struct rw_semaphore i_data_sem;
 984         /*
 985          * i_mmap_sem is for serializing page faults with truncate / punch hole
 986          * operations. We have to make sure that new page cannot be faulted in
 987          * a section of the inode that is being punched. We cannot easily use
 988          * i_data_sem for this since we need protection for the whole punch
 989          * operation and i_data_sem ranks below transaction start so we have
 990          * to occasionally drop it.
 991          */
 992         struct rw_semaphore i_mmap_sem;
 993         struct inode vfs_inode;
 994         struct jbd2_inode *jinode;
 995
 996         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
 997
 998         /*
 999          * File creation time. Its function is same as that of
1000          * struct timespec64 i_{a,c,m}time in the generic inode.
1001          */
1002         struct timespec64 i_crtime;
1003
1004         /* mballoc */
1005         struct list_head i_prealloc_list;
1006         spinlock_t i_prealloc_lock;
1007
1008         /* extents status tree */
1009         struct ext4_es_tree i_es_tree;
1010         rwlock_t i_es_lock;
1011         struct list_head i_es_list;
1012         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1013         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1014         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1015                                            extents to shrink. Protected by
1016                                            i_es_lock  */
1017
1018         /* ialloc */
1019         ext4_group_t    i_last_alloc_group;
1020
1021         /* allocation reservation info for delalloc */
1022         /* In case of bigalloc, this refer to clusters rather than blocks */
1023         unsigned int i_reserved_data_blocks;
1024         ext4_lblk_t i_da_metadata_calc_last_lblock;
1025         int i_da_metadata_calc_len;
1026
1027         /* pending cluster reservations for bigalloc file systems */
1028         struct ext4_pending_tree i_pending_tree;
1029
1030         /* on-disk additional length */
1031         __u16 i_extra_isize;
1032
1033         /* Indicate the inline data space. */
1034         u16 i_inline_off;
1035         u16 i_inline_size;
1036
1037 #ifdef CONFIG_QUOTA
1038         /* quota space reservation, managed internally by quota code */
1039         qsize_t i_reserved_quota;
1040 #endif
1041
1042         /* Lock protecting lists below */
1043         spinlock_t i_completed_io_lock;
1044         /*
1045          * Completed IOs that need unwritten extents handling and have
1046          * transaction reserved
1047          */
1048         struct list_head i_rsv_conversion_list;
1049         struct work_struct i_rsv_conversion_work;
1050         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1051
1052         spinlock_t i_block_reservation_lock;
1053
1054         /*
1055          * Transactions that contain inode's metadata needed to complete
1056          * fsync and fdatasync, respectively.
1057          */
1058         tid_t i_sync_tid;
1059         tid_t i_datasync_tid;
1060
1061 #ifdef CONFIG_QUOTA
1062         struct dquot *i_dquot[MAXQUOTAS];
1063 #endif
1064
1065         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1066         __u32 i_csum_seed;
1067
1068         kprojid_t i_projid;
1069 };
1070
1071 /*
1072  * File system states
1073  */
1074 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1075 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1076 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1077
1078 /*
1079  * Misc. filesystem flags
1080  */
1081 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1082 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1083 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1084
1085 /*
1086  * Mount flags set via mount options or defaults
1087  */
1088 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1089 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1090 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1091 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1092 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1093 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1094 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1095 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1096 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1097 #ifdef CONFIG_FS_DAX
1098 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1099 #else
1100 #define EXT4_MOUNT_DAX                  0
1101 #endif
1102 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1103 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1104 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1105 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1106 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1107 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1108 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1109 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1110 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1111 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1112 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1113 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1114                                                  * enable enforcement for hidden
1115                                                  * quota files */
1116 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1117                                                   * enforcement for hidden quota
1118                                                   * files */
1119 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1120                                                   * enforcement */
1121 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1122 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1123 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1124 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1125 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1126 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1127 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1128 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1129 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1130
1131 /*
1132  * Mount flags set either automatically (could not be set by mount option)
1133  * based on per file system feature or property or in special cases such as
1134  * distinguishing between explicit mount option definition and default.
1135  */
1136 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1137                                                       specified delalloc */
1138 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1139                                                       size of blocksize * 8
1140                                                       blocks */
1141 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1142                                                       file systems */
1143
1144 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1145                                                 specified journal checksum */
1146
1147 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1148                                                 ~EXT4_MOUNT_##opt
1149 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1150                                                 EXT4_MOUNT_##opt
1151 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1152                                          EXT4_MOUNT_##opt)
1153
1154 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1155                                                 ~EXT4_MOUNT2_##opt
1156 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1157                                                 EXT4_MOUNT2_##opt
1158 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1159                                          EXT4_MOUNT2_##opt)
1160
1161 #define ext4_test_and_set_bit           __test_and_set_bit_le
1162 #define ext4_set_bit                    __set_bit_le
1163 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1164 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1165 #define ext4_clear_bit                  __clear_bit_le
1166 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1167 #define ext4_test_bit                   test_bit_le
1168 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1169 #define ext4_find_next_bit              find_next_bit_le
1170
1171 extern void ext4_set_bits(void *bm, int cur, int len);
1172
1173 /*
1174  * Maximal mount counts between two filesystem checks
1175  */
1176 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1177 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1178
1179 /*
1180  * Behaviour when detecting errors
1181  */
1182 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1183 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1184 #define EXT4_ERRORS_PANIC               3       /* Panic */
1185 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1186
1187 /* Metadata checksum algorithm codes */
1188 #define EXT4_CRC32C_CHKSUM              1
1189
1190 /*
1191  * Structure of the super block
1192  */
1193 struct ext4_super_block {
1194 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1195         __le32  s_blocks_count_lo;      /* Blocks count */
1196         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1197         __le32  s_free_blocks_count_lo; /* Free blocks count */
1198 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1199         __le32  s_first_data_block;     /* First Data Block */
1200         __le32  s_log_block_size;       /* Block size */
1201         __le32  s_log_cluster_size;     /* Allocation cluster size */
1202 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1203         __le32  s_clusters_per_group;   /* # Clusters per group */
1204         __le32  s_inodes_per_group;     /* # Inodes per group */
1205         __le32  s_mtime;                /* Mount time */
1206 /*30*/  __le32  s_wtime;                /* Write time */
1207         __le16  s_mnt_count;            /* Mount count */
1208         __le16  s_max_mnt_count;        /* Maximal mount count */
1209         __le16  s_magic;                /* Magic signature */
1210         __le16  s_state;                /* File system state */
1211         __le16  s_errors;               /* Behaviour when detecting errors */
1212         __le16  s_minor_rev_level;      /* minor revision level */
1213 /*40*/  __le32  s_lastcheck;            /* time of last check */
1214         __le32  s_checkinterval;        /* max. time between checks */
1215         __le32  s_creator_os;           /* OS */
1216         __le32  s_rev_level;            /* Revision level */
1217 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1218         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1219         /*
1220          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1221          *
1222          * Note: the difference between the compatible feature set and
1223          * the incompatible feature set is that if there is a bit set
1224          * in the incompatible feature set that the kernel doesn't
1225          * know about, it should refuse to mount the filesystem.
1226          *
1227          * e2fsck's requirements are more strict; if it doesn't know
1228          * about a feature in either the compatible or incompatible
1229          * feature set, it must abort and not try to meddle with
1230          * things it doesn't understand...
1231          */
1232         __le32  s_first_ino;            /* First non-reserved inode */
1233         __le16  s_inode_size;           /* size of inode structure */
1234         __le16  s_block_group_nr;       /* block group # of this superblock */
1235         __le32  s_feature_compat;       /* compatible feature set */
1236 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1237         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1238 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1239 /*78*/  char    s_volume_name[16];      /* volume name */
1240 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1241 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1242         /*
1243          * Performance hints.  Directory preallocation should only
1244          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1245          */
1246         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1247         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1248         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1249         /*
1250          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1251          */
1252 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1253 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1254         __le32  s_journal_dev;          /* device number of journal file */
1255         __le32  s_last_orphan;          /* start of list of inodes to delete */
1256         __le32  s_hash_seed[4];         /* HTREE hash seed */
1257         __u8    s_def_hash_version;     /* Default hash version to use */
1258         __u8    s_jnl_backup_type;
1259         __le16  s_desc_size;            /* size of group descriptor */
1260 /*100*/ __le32  s_default_mount_opts;
1261         __le32  s_first_meta_bg;        /* First metablock block group */
1262         __le32  s_mkfs_time;            /* When the filesystem was created */
1263         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1264         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1265 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1266         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1267         __le32  s_free_blocks_count_hi; /* Free blocks count */
1268         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1269         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1270         __le32  s_flags;                /* Miscellaneous flags */
1271         __le16  s_raid_stride;          /* RAID stride */
1272         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1273         __le64  s_mmp_block;            /* Block for multi-mount protection */
1274         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1275         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1276         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1277         __u8    s_encryption_level;     /* versioning level for encryption */
1278         __u8    s_reserved_pad;         /* Padding to next 32bits */
1279         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1280         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1281         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1282         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1283                                               snapshot's future use */
1284         __le32  s_snapshot_list;        /* inode number of the head of the
1285                                            on-disk snapshot list */
1286 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1287         __le32  s_error_count;          /* number of fs errors */
1288         __le32  s_first_error_time;     /* first time an error happened */
1289         __le32  s_first_error_ino;      /* inode involved in first error */
1290         __le64  s_first_error_block;    /* block involved of first error */
1291         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1292         __le32  s_first_error_line;     /* line number where error happened */
1293         __le32  s_last_error_time;      /* most recent time of an error */
1294         __le32  s_last_error_ino;       /* inode involved in last error */
1295         __le32  s_last_error_line;      /* line number where error happened */
1296         __le64  s_last_error_block;     /* block involved of last error */
1297         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1298 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1299         __u8    s_mount_opts[64];
1300         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1301         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1302         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1303         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1304         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1305         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1306         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1307         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1308         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1309         __u8    s_wtime_hi;
1310         __u8    s_mtime_hi;
1311         __u8    s_mkfs_time_hi;
1312         __u8    s_lastcheck_hi;
1313         __u8    s_first_error_time_hi;
1314         __u8    s_last_error_time_hi;
1315         __u8    s_pad[2];
1316         __le32  s_reserved[96];         /* Padding to the end of the block */
1317         __le32  s_checksum;             /* crc32c(superblock) */
1318 };
1319
1320 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1321
1322 #ifdef __KERNEL__
1323
1324 /*
1325  * run-time mount flags
1326  */
1327 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1328 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1329 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1330
1331 #ifdef CONFIG_FS_ENCRYPTION
1332 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1333                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1334 #else
1335 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1336 #endif
1337
1338 /* Number of quota types we support */
1339 #define EXT4_MAXQUOTAS 3
1340
1341 /*
1342  * fourth extended-fs super-block data in memory
1343  */
1344 struct ext4_sb_info {
1345         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1346         unsigned long s_inodes_per_block;/* Number of inodes per block */
1347         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1348         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1349         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1350         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1351         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1352         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1353         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1354         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1355         unsigned long s_overhead;  /* # of fs overhead clusters */
1356         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1357         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1358         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1359         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1360         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1361         struct buffer_head **s_group_desc;
1362         unsigned int s_mount_opt;
1363         unsigned int s_mount_opt2;
1364         unsigned int s_mount_flags;
1365         unsigned int s_def_mount_opt;
1366         ext4_fsblk_t s_sb_block;
1367         atomic64_t s_resv_clusters;
1368         kuid_t s_resuid;
1369         kgid_t s_resgid;
1370         unsigned short s_mount_state;
1371         unsigned short s_pad;
1372         int s_addr_per_block_bits;
1373         int s_desc_per_block_bits;
1374         int s_inode_size;
1375         int s_first_ino;
1376         unsigned int s_inode_readahead_blks;
1377         unsigned int s_inode_goal;
1378         u32 s_hash_seed[4];
1379         int s_def_hash_version;
1380         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1381         struct percpu_counter s_freeclusters_counter;
1382         struct percpu_counter s_freeinodes_counter;
1383         struct percpu_counter s_dirs_counter;
1384         struct percpu_counter s_dirtyclusters_counter;
1385         struct blockgroup_lock *s_blockgroup_lock;
1386         struct proc_dir_entry *s_proc;
1387         struct kobject s_kobj;
1388         struct completion s_kobj_unregister;
1389         struct super_block *s_sb;
1390
1391         /* Journaling */
1392         struct journal_s *s_journal;
1393         struct list_head s_orphan;
1394         struct mutex s_orphan_lock;
1395         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1396         unsigned long s_commit_interval;
1397         u32 s_max_batch_time;
1398         u32 s_min_batch_time;
1399         struct block_device *journal_bdev;
1400 #ifdef CONFIG_QUOTA
1401         /* Names of quota files with journalled quota */
1402         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1403         int s_jquota_fmt;                       /* Format of quota to use */
1404 #endif
1405         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1406         struct rb_root system_blks;
1407
1408 #ifdef EXTENTS_STATS
1409         /* ext4 extents stats */
1410         unsigned long s_ext_min;
1411         unsigned long s_ext_max;
1412         unsigned long s_depth_max;
1413         spinlock_t s_ext_stats_lock;
1414         unsigned long s_ext_blocks;
1415         unsigned long s_ext_extents;
1416 #endif
1417
1418         /* for buddy allocator */
1419         struct ext4_group_info ***s_group_info;
1420         struct inode *s_buddy_cache;
1421         spinlock_t s_md_lock;
1422         unsigned short *s_mb_offsets;
1423         unsigned int *s_mb_maxs;
1424         unsigned int s_group_info_size;
1425         unsigned int s_mb_free_pending;
1426         struct list_head s_freed_data_list;     /* List of blocks to be freed
1427                                                    after commit completed */
1428
1429         /* tunables */
1430         unsigned long s_stripe;
1431         unsigned int s_mb_stream_request;
1432         unsigned int s_mb_max_to_scan;
1433         unsigned int s_mb_min_to_scan;
1434         unsigned int s_mb_stats;
1435         unsigned int s_mb_order2_reqs;
1436         unsigned int s_mb_group_prealloc;
1437         unsigned int s_max_dir_size_kb;
1438         /* where last allocation was done - for stream allocation */
1439         unsigned long s_mb_last_group;
1440         unsigned long s_mb_last_start;
1441
1442         /* stats for buddy allocator */
1443         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1444         atomic_t s_bal_success; /* we found long enough chunks */
1445         atomic_t s_bal_allocated;       /* in blocks */
1446         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1447         atomic_t s_bal_goals;   /* goal hits */
1448         atomic_t s_bal_breaks;  /* too long searches */
1449         atomic_t s_bal_2orders; /* 2^order hits */
1450         spinlock_t s_bal_lock;
1451         unsigned long s_mb_buddies_generated;
1452         unsigned long long s_mb_generation_time;
1453         atomic_t s_mb_lost_chunks;
1454         atomic_t s_mb_preallocated;
1455         atomic_t s_mb_discarded;
1456         atomic_t s_lock_busy;
1457
1458         /* locality groups */
1459         struct ext4_locality_group __percpu *s_locality_groups;
1460
1461         /* for write statistics */
1462         unsigned long s_sectors_written_start;
1463         u64 s_kbytes_written;
1464
1465         /* the size of zero-out chunk */
1466         unsigned int s_extent_max_zeroout_kb;
1467
1468         unsigned int s_log_groups_per_flex;
1469         struct flex_groups *s_flex_groups;
1470         ext4_group_t s_flex_groups_allocated;
1471
1472         /* workqueue for reserved extent conversions (buffered io) */
1473         struct workqueue_struct *rsv_conversion_wq;
1474
1475         /* timer for periodic error stats printing */
1476         struct timer_list s_err_report;
1477
1478         /* Lazy inode table initialization info */
1479         struct ext4_li_request *s_li_request;
1480         /* Wait multiplier for lazy initialization thread */
1481         unsigned int s_li_wait_mult;
1482
1483         /* Kernel thread for multiple mount protection */
1484         struct task_struct *s_mmp_tsk;
1485
1486         /* record the last minlen when FITRIM is called. */
1487         atomic_t s_last_trim_minblks;
1488
1489         /* Reference to checksum algorithm driver via cryptoapi */
1490         struct crypto_shash *s_chksum_driver;
1491
1492         /* Precomputed FS UUID checksum for seeding other checksums */
1493         __u32 s_csum_seed;
1494
1495         /* Reclaim extents from extent status tree */
1496         struct shrinker s_es_shrinker;
1497         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1498         long s_es_nr_inode;
1499         struct ext4_es_stats s_es_stats;
1500         struct mb_cache *s_ea_block_cache;
1501         struct mb_cache *s_ea_inode_cache;
1502         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1503
1504         /* Ratelimit ext4 messages. */
1505         struct ratelimit_state s_err_ratelimit_state;
1506         struct ratelimit_state s_warning_ratelimit_state;
1507         struct ratelimit_state s_msg_ratelimit_state;
1508
1509         /* Barrier between changing inodes' journal flags and writepages ops. */
1510         struct percpu_rw_semaphore s_journal_flag_rwsem;
1511         struct dax_device *s_daxdev;
1512 };
1513
1514 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1515 {
1516         return sb->s_fs_info;
1517 }
1518 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1519 {
1520         return container_of(inode, struct ext4_inode_info, vfs_inode);
1521 }
1522
1523 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1524 {
1525         return ino == EXT4_ROOT_INO ||
1526                 (ino >= EXT4_FIRST_INO(sb) &&
1527                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1528 }
1529
1530 /*
1531  * Inode dynamic state flags
1532  */
1533 enum {
1534         EXT4_STATE_JDATA,               /* journaled data exists */
1535         EXT4_STATE_NEW,                 /* inode is newly created */
1536         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1537         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1538         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1539         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1540         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1541         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1542         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1543         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1544         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1545 };
1546
1547 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1548 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1549 {                                                                       \
1550         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1551 }                                                                       \
1552 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1553 {                                                                       \
1554         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1555 }                                                                       \
1556 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1557 {                                                                       \
1558         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1559 }
1560
1561 /* Add these declarations here only so that these functions can be
1562  * found by name.  Otherwise, they are very hard to locate. */
1563 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1564 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1565 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1566 EXT4_INODE_BIT_FNS(flag, flags, 0)
1567
1568 /* Add these declarations here only so that these functions can be
1569  * found by name.  Otherwise, they are very hard to locate. */
1570 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1571 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1572 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1573 #if (BITS_PER_LONG < 64)
1574 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1575
1576 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1577 {
1578         (ei)->i_state_flags = 0;
1579 }
1580 #else
1581 EXT4_INODE_BIT_FNS(state, flags, 32)
1582
1583 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1584 {
1585         /* We depend on the fact that callers will set i_flags */
1586 }
1587 #endif
1588 #else
1589 /* Assume that user mode programs are passing in an ext4fs superblock, not
1590  * a kernel struct super_block.  This will allow us to call the feature-test
1591  * macros from user land. */
1592 #define EXT4_SB(sb)     (sb)
1593 #endif
1594
1595 /*
1596  * Returns true if the inode is inode is encrypted
1597  */
1598 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1599
1600 /*
1601  * Codes for operating systems
1602  */
1603 #define EXT4_OS_LINUX           0
1604 #define EXT4_OS_HURD            1
1605 #define EXT4_OS_MASIX           2
1606 #define EXT4_OS_FREEBSD         3
1607 #define EXT4_OS_LITES           4
1608
1609 /*
1610  * Revision levels
1611  */
1612 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1613 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1614
1615 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1616 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1617
1618 #define EXT4_GOOD_OLD_INODE_SIZE 128
1619
1620 /*
1621  * Feature set definitions
1622  */
1623
1624 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1625 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1626 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1627 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1628 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1629 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1630 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1631
1632 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1633 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1634 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1635 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1636 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1637 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1638 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1639 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1640 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1641 /*
1642  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1643  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1644  * all other data structures' checksums.  However, the METADATA_CSUM and
1645  * GDT_CSUM bits are mutually exclusive.
1646  */
1647 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1648 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1649 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1650
1651 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1652 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1653 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1654 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1655 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1656 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1657 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1658 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1659 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1660 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1661 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1662 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1663 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1664 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1665 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1666
1667 extern void ext4_update_dynamic_rev(struct super_block *sb);
1668
1669 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1670 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1671 { \
1672         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1673                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1674 } \
1675 static inline void ext4_set_feature_##name(struct super_block *sb) \
1676 { \
1677         ext4_update_dynamic_rev(sb); \
1678         EXT4_SB(sb)->s_es->s_feature_compat |= \
1679                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1680 } \
1681 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1682 { \
1683         EXT4_SB(sb)->s_es->s_feature_compat &= \
1684                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1685 }
1686
1687 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1688 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1689 { \
1690         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1691                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1692 } \
1693 static inline void ext4_set_feature_##name(struct super_block *sb) \
1694 { \
1695         ext4_update_dynamic_rev(sb); \
1696         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1697                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1698 } \
1699 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1700 { \
1701         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1702                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1703 }
1704
1705 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1706 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1707 { \
1708         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1709                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1710 } \
1711 static inline void ext4_set_feature_##name(struct super_block *sb) \
1712 { \
1713         ext4_update_dynamic_rev(sb); \
1714         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1715                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1716 } \
1717 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1718 { \
1719         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1720                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1721 }
1722
1723 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1724 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1725 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1726 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1727 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1728 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1729 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1730
1731 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1732 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1733 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1734 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1735 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1736 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1737 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1738 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1739 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1740 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1741 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1742 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1743
1744 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1745 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1746 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1747 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1748 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1749 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1750 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1751 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1752 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1753 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1754 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1755 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1756 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1757 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1758 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1759
1760 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1761 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1762                                          EXT4_FEATURE_INCOMPAT_META_BG)
1763 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1764                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1765                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1766
1767 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1768 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1769                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1770                                          EXT4_FEATURE_INCOMPAT_META_BG)
1771 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1772                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1773                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1774
1775 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1776 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1777                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1778                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1779                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1780                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1781                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1782                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1783                                          EXT4_FEATURE_INCOMPAT_MMP | \
1784                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1785                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1786                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1787                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1788 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1789                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1790                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1791                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1792                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1793                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1794                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1795                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1796                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1797                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1798                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1799
1800 #define EXTN_FEATURE_FUNCS(ver) \
1801 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1802 { \
1803         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1804                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1805 } \
1806 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1807 { \
1808         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1809                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1810 } \
1811 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1812 { \
1813         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1814                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1815 }
1816
1817 EXTN_FEATURE_FUNCS(2)
1818 EXTN_FEATURE_FUNCS(3)
1819 EXTN_FEATURE_FUNCS(4)
1820
1821 static inline bool ext4_has_compat_features(struct super_block *sb)
1822 {
1823         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1824 }
1825 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1826 {
1827         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1828 }
1829 static inline bool ext4_has_incompat_features(struct super_block *sb)
1830 {
1831         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1832 }
1833
1834 /*
1835  * Superblock flags
1836  */
1837 #define EXT4_FLAGS_RESIZING     0
1838 #define EXT4_FLAGS_SHUTDOWN     1
1839
1840 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1841 {
1842         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1843 }
1844
1845
1846 /*
1847  * Default values for user and/or group using reserved blocks
1848  */
1849 #define EXT4_DEF_RESUID         0
1850 #define EXT4_DEF_RESGID         0
1851
1852 /*
1853  * Default project ID
1854  */
1855 #define EXT4_DEF_PROJID         0
1856
1857 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1858
1859 /*
1860  * Default mount options
1861  */
1862 #define EXT4_DEFM_DEBUG         0x0001
1863 #define EXT4_DEFM_BSDGROUPS     0x0002
1864 #define EXT4_DEFM_XATTR_USER    0x0004
1865 #define EXT4_DEFM_ACL           0x0008
1866 #define EXT4_DEFM_UID16         0x0010
1867 #define EXT4_DEFM_JMODE         0x0060
1868 #define EXT4_DEFM_JMODE_DATA    0x0020
1869 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1870 #define EXT4_DEFM_JMODE_WBACK   0x0060
1871 #define EXT4_DEFM_NOBARRIER     0x0100
1872 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1873 #define EXT4_DEFM_DISCARD       0x0400
1874 #define EXT4_DEFM_NODELALLOC    0x0800
1875
1876 /*
1877  * Default journal batch times
1878  */
1879 #define EXT4_DEF_MIN_BATCH_TIME 0
1880 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1881
1882 /*
1883  * Minimum number of groups in a flexgroup before we separate out
1884  * directories into the first block group of a flexgroup
1885  */
1886 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1887
1888 /*
1889  * Structure of a directory entry
1890  */
1891 #define EXT4_NAME_LEN 255
1892
1893 struct ext4_dir_entry {
1894         __le32  inode;                  /* Inode number */
1895         __le16  rec_len;                /* Directory entry length */
1896         __le16  name_len;               /* Name length */
1897         char    name[EXT4_NAME_LEN];    /* File name */
1898 };
1899
1900 /*
1901  * The new version of the directory entry.  Since EXT4 structures are
1902  * stored in intel byte order, and the name_len field could never be
1903  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1904  * file_type field.
1905  */
1906 struct ext4_dir_entry_2 {
1907         __le32  inode;                  /* Inode number */
1908         __le16  rec_len;                /* Directory entry length */
1909         __u8    name_len;               /* Name length */
1910         __u8    file_type;
1911         char    name[EXT4_NAME_LEN];    /* File name */
1912 };
1913
1914 /*
1915  * This is a bogus directory entry at the end of each leaf block that
1916  * records checksums.
1917  */
1918 struct ext4_dir_entry_tail {
1919         __le32  det_reserved_zero1;     /* Pretend to be unused */
1920         __le16  det_rec_len;            /* 12 */
1921         __u8    det_reserved_zero2;     /* Zero name length */
1922         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1923         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1924 };
1925
1926 #define EXT4_DIRENT_TAIL(block, blocksize) \
1927         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1928                                         ((blocksize) - \
1929                                          sizeof(struct ext4_dir_entry_tail))))
1930
1931 /*
1932  * Ext4 directory file types.  Only the low 3 bits are used.  The
1933  * other bits are reserved for now.
1934  */
1935 #define EXT4_FT_UNKNOWN         0
1936 #define EXT4_FT_REG_FILE        1
1937 #define EXT4_FT_DIR             2
1938 #define EXT4_FT_CHRDEV          3
1939 #define EXT4_FT_BLKDEV          4
1940 #define EXT4_FT_FIFO            5
1941 #define EXT4_FT_SOCK            6
1942 #define EXT4_FT_SYMLINK         7
1943
1944 #define EXT4_FT_MAX             8
1945
1946 #define EXT4_FT_DIR_CSUM        0xDE
1947
1948 /*
1949  * EXT4_DIR_PAD defines the directory entries boundaries
1950  *
1951  * NOTE: It must be a multiple of 4
1952  */
1953 #define EXT4_DIR_PAD                    4
1954 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1955 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1956                                          ~EXT4_DIR_ROUND)
1957 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1958
1959 /*
1960  * If we ever get support for fs block sizes > page_size, we'll need
1961  * to remove the #if statements in the next two functions...
1962  */
1963 static inline unsigned int
1964 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1965 {
1966         unsigned len = le16_to_cpu(dlen);
1967
1968 #if (PAGE_SIZE >= 65536)
1969         if (len == EXT4_MAX_REC_LEN || len == 0)
1970                 return blocksize;
1971         return (len & 65532) | ((len & 3) << 16);
1972 #else
1973         return len;
1974 #endif
1975 }
1976
1977 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1978 {
1979         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1980                 BUG();
1981 #if (PAGE_SIZE >= 65536)
1982         if (len < 65536)
1983                 return cpu_to_le16(len);
1984         if (len == blocksize) {
1985                 if (blocksize == 65536)
1986                         return cpu_to_le16(EXT4_MAX_REC_LEN);
1987                 else
1988                         return cpu_to_le16(0);
1989         }
1990         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1991 #else
1992         return cpu_to_le16(len);
1993 #endif
1994 }
1995
1996 /*
1997  * Hash Tree Directory indexing
1998  * (c) Daniel Phillips, 2001
1999  */
2000
2001 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2002                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2003 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2004                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2005 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2006
2007 /* Legal values for the dx_root hash_version field: */
2008
2009 #define DX_HASH_LEGACY                  0
2010 #define DX_HASH_HALF_MD4                1
2011 #define DX_HASH_TEA                     2
2012 #define DX_HASH_LEGACY_UNSIGNED         3
2013 #define DX_HASH_HALF_MD4_UNSIGNED       4
2014 #define DX_HASH_TEA_UNSIGNED            5
2015
2016 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2017                               const void *address, unsigned int length)
2018 {
2019         struct {
2020                 struct shash_desc shash;
2021                 char ctx[4];
2022         } desc;
2023
2024         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2025
2026         desc.shash.tfm = sbi->s_chksum_driver;
2027         desc.shash.flags = 0;
2028         *(u32 *)desc.ctx = crc;
2029
2030         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2031
2032         return *(u32 *)desc.ctx;
2033 }
2034
2035 #ifdef __KERNEL__
2036
2037 /* hash info structure used by the directory hash */
2038 struct dx_hash_info
2039 {
2040         u32             hash;
2041         u32             minor_hash;
2042         int             hash_version;
2043         u32             *seed;
2044 };
2045
2046
2047 /* 32 and 64 bit signed EOF for dx directories */
2048 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2049 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2050
2051
2052 /*
2053  * Control parameters used by ext4_htree_next_block
2054  */
2055 #define HASH_NB_ALWAYS          1
2056
2057 struct ext4_filename {
2058         const struct qstr *usr_fname;
2059         struct fscrypt_str disk_name;
2060         struct dx_hash_info hinfo;
2061 #ifdef CONFIG_FS_ENCRYPTION
2062         struct fscrypt_str crypto_buf;
2063 #endif
2064 };
2065
2066 #define fname_name(p) ((p)->disk_name.name)
2067 #define fname_len(p)  ((p)->disk_name.len)
2068
2069 /*
2070  * Describe an inode's exact location on disk and in memory
2071  */
2072 struct ext4_iloc
2073 {
2074         struct buffer_head *bh;
2075         unsigned long offset;
2076         ext4_group_t block_group;
2077 };
2078
2079 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2080 {
2081         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2082 }
2083
2084 static inline bool ext4_is_quota_file(struct inode *inode)
2085 {
2086         return IS_NOQUOTA(inode) &&
2087                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2088 }
2089
2090 /*
2091  * This structure is stuffed into the struct file's private_data field
2092  * for directories.  It is where we put information so that we can do
2093  * readdir operations in hash tree order.
2094  */
2095 struct dir_private_info {
2096         struct rb_root  root;
2097         struct rb_node  *curr_node;
2098         struct fname    *extra_fname;
2099         loff_t          last_pos;
2100         __u32           curr_hash;
2101         __u32           curr_minor_hash;
2102         __u32           next_hash;
2103 };
2104
2105 /* calculate the first block number of the group */
2106 static inline ext4_fsblk_t
2107 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2108 {
2109         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2110                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2111 }
2112
2113 /*
2114  * Special error return code only used by dx_probe() and its callers.
2115  */
2116 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2117
2118 /* htree levels for ext4 */
2119 #define EXT4_HTREE_LEVEL_COMPAT 2
2120 #define EXT4_HTREE_LEVEL        3
2121
2122 static inline int ext4_dir_htree_level(struct super_block *sb)
2123 {
2124         return ext4_has_feature_largedir(sb) ?
2125                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2126 }
2127
2128 /*
2129  * Timeout and state flag for lazy initialization inode thread.
2130  */
2131 #define EXT4_DEF_LI_WAIT_MULT                   10
2132 #define EXT4_DEF_LI_MAX_START_DELAY             5
2133 #define EXT4_LAZYINIT_QUIT                      0x0001
2134 #define EXT4_LAZYINIT_RUNNING                   0x0002
2135
2136 /*
2137  * Lazy inode table initialization info
2138  */
2139 struct ext4_lazy_init {
2140         unsigned long           li_state;
2141         struct list_head        li_request_list;
2142         struct mutex            li_list_mtx;
2143 };
2144
2145 struct ext4_li_request {
2146         struct super_block      *lr_super;
2147         struct ext4_sb_info     *lr_sbi;
2148         ext4_group_t            lr_next_group;
2149         struct list_head        lr_request;
2150         unsigned long           lr_next_sched;
2151         unsigned long           lr_timeout;
2152 };
2153
2154 struct ext4_features {
2155         struct kobject f_kobj;
2156         struct completion f_kobj_unregister;
2157 };
2158
2159 /*
2160  * This structure will be used for multiple mount protection. It will be
2161  * written into the block number saved in the s_mmp_block field in the
2162  * superblock. Programs that check MMP should assume that if
2163  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2164  * to use the filesystem, regardless of how old the timestamp is.
2165  */
2166 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2167 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2168 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2169 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2170
2171 struct mmp_struct {
2172         __le32  mmp_magic;              /* Magic number for MMP */
2173         __le32  mmp_seq;                /* Sequence no. updated periodically */
2174
2175         /*
2176          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2177          * purposes and do not affect the correctness of the algorithm
2178          */
2179         __le64  mmp_time;               /* Time last updated */
2180         char    mmp_nodename[64];       /* Node which last updated MMP block */
2181         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2182
2183         /*
2184          * mmp_check_interval is used to verify if the MMP block has been
2185          * updated on the block device. The value is updated based on the
2186          * maximum time to write the MMP block during an update cycle.
2187          */
2188         __le16  mmp_check_interval;
2189
2190         __le16  mmp_pad1;
2191         __le32  mmp_pad2[226];
2192         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2193 };
2194
2195 /* arguments passed to the mmp thread */
2196 struct mmpd_data {
2197         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2198         struct super_block *sb;  /* super block of the fs */
2199 };
2200
2201 /*
2202  * Check interval multiplier
2203  * The MMP block is written every update interval and initially checked every
2204  * update interval x the multiplier (the value is then adapted based on the
2205  * write latency). The reason is that writes can be delayed under load and we
2206  * don't want readers to incorrectly assume that the filesystem is no longer
2207  * in use.
2208  */
2209 #define EXT4_MMP_CHECK_MULT             2UL
2210
2211 /*
2212  * Minimum interval for MMP checking in seconds.
2213  */
2214 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2215
2216 /*
2217  * Maximum interval for MMP checking in seconds.
2218  */
2219 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2220
2221 /*
2222  * Function prototypes
2223  */
2224
2225 /*
2226  * Ok, these declarations are also in <linux/kernel.h> but none of the
2227  * ext4 source programs needs to include it so they are duplicated here.
2228  */
2229 # define NORET_TYPE     /**/
2230 # define ATTRIB_NORET   __attribute__((noreturn))
2231 # define NORET_AND      noreturn,
2232
2233 /* bitmap.c */
2234 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2235 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2236                                 struct ext4_group_desc *gdp,
2237                                 struct buffer_head *bh, int sz);
2238 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2239                                   struct ext4_group_desc *gdp,
2240                                   struct buffer_head *bh, int sz);
2241 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2242                                 struct ext4_group_desc *gdp,
2243                                 struct buffer_head *bh);
2244 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2245                                   struct ext4_group_desc *gdp,
2246                                   struct buffer_head *bh);
2247
2248 /* balloc.c */
2249 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2250                                          ext4_fsblk_t blocknr,
2251                                          ext4_group_t *blockgrpp,
2252                                          ext4_grpblk_t *offsetp);
2253 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2254                                           ext4_fsblk_t block);
2255
2256 extern unsigned int ext4_block_group(struct super_block *sb,
2257                         ext4_fsblk_t blocknr);
2258 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2259                         ext4_fsblk_t blocknr);
2260 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2261 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2262                         ext4_group_t group);
2263 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2264                                          ext4_fsblk_t goal,
2265                                          unsigned int flags,
2266                                          unsigned long *count,
2267                                          int *errp);
2268 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2269                                     s64 nclusters, unsigned int flags);
2270 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2271 extern void ext4_check_blocks_bitmap(struct super_block *);
2272 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2273                                                     ext4_group_t block_group,
2274                                                     struct buffer_head ** bh);
2275 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2276
2277 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2278                                                 ext4_group_t block_group);
2279 extern int ext4_wait_block_bitmap(struct super_block *sb,
2280                                   ext4_group_t block_group,
2281                                   struct buffer_head *bh);
2282 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2283                                                   ext4_group_t block_group);
2284 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2285                                               ext4_group_t block_group,
2286                                               struct ext4_group_desc *gdp);
2287 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2288
2289 #ifdef CONFIG_FS_ENCRYPTION
2290 static inline int ext4_fname_setup_filename(struct inode *dir,
2291                         const struct qstr *iname,
2292                         int lookup, struct ext4_filename *fname)
2293 {
2294         struct fscrypt_name name;
2295         int err;
2296
2297         memset(fname, 0, sizeof(struct ext4_filename));
2298
2299         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2300
2301         fname->usr_fname = name.usr_fname;
2302         fname->disk_name = name.disk_name;
2303         fname->hinfo.hash = name.hash;
2304         fname->hinfo.minor_hash = name.minor_hash;
2305         fname->crypto_buf = name.crypto_buf;
2306         return err;
2307 }
2308
2309 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2310 {
2311         struct fscrypt_name name;
2312
2313         name.crypto_buf = fname->crypto_buf;
2314         fscrypt_free_filename(&name);
2315
2316         fname->crypto_buf.name = NULL;
2317         fname->usr_fname = NULL;
2318         fname->disk_name.name = NULL;
2319 }
2320 #else
2321 static inline int ext4_fname_setup_filename(struct inode *dir,
2322                 const struct qstr *iname,
2323                 int lookup, struct ext4_filename *fname)
2324 {
2325         fname->usr_fname = iname;
2326         fname->disk_name.name = (unsigned char *) iname->name;
2327         fname->disk_name.len = iname->len;
2328         return 0;
2329 }
2330 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2331
2332 #endif
2333
2334 /* dir.c */
2335 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2336                                   struct file *,
2337                                   struct ext4_dir_entry_2 *,
2338                                   struct buffer_head *, char *, int,
2339                                   unsigned int);
2340 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2341         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2342                                         (de), (bh), (buf), (size), (offset)))
2343 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2344                                 __u32 minor_hash,
2345                                 struct ext4_dir_entry_2 *dirent,
2346                                 struct fscrypt_str *ent_name);
2347 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2348 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2349                              struct buffer_head *bh,
2350                              void *buf, int buf_size,
2351                              struct ext4_filename *fname,
2352                              struct ext4_dir_entry_2 **dest_de);
2353 void ext4_insert_dentry(struct inode *inode,
2354                         struct ext4_dir_entry_2 *de,
2355                         int buf_size,
2356                         struct ext4_filename *fname);
2357 static inline void ext4_update_dx_flag(struct inode *inode)
2358 {
2359         if (!ext4_has_feature_dir_index(inode->i_sb))
2360                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2361 }
2362 static const unsigned char ext4_filetype_table[] = {
2363         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2364 };
2365
2366 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2367 {
2368         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2369                 return DT_UNKNOWN;
2370
2371         return ext4_filetype_table[filetype];
2372 }
2373 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2374                              void *buf, int buf_size);
2375
2376 /* fsync.c */
2377 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2378
2379 /* hash.c */
2380 extern int ext4fs_dirhash(const char *name, int len, struct
2381                           dx_hash_info *hinfo);
2382
2383 /* ialloc.c */
2384 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2385                                       const struct qstr *qstr, __u32 goal,
2386                                       uid_t *owner, __u32 i_flags,
2387                                       int handle_type, unsigned int line_no,
2388                                       int nblocks);
2389
2390 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2391         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2392                          i_flags, 0, 0, 0)
2393 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2394                                     type, nblocks)                  \
2395         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2396                          0, (type), __LINE__, (nblocks))
2397
2398
2399 extern void ext4_free_inode(handle_t *, struct inode *);
2400 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2401 extern unsigned long ext4_count_free_inodes(struct super_block *);
2402 extern unsigned long ext4_count_dirs(struct super_block *);
2403 extern void ext4_check_inodes_bitmap(struct super_block *);
2404 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2405 extern int ext4_init_inode_table(struct super_block *sb,
2406                                  ext4_group_t group, int barrier);
2407 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2408
2409 /* mballoc.c */
2410 extern const struct seq_operations ext4_mb_seq_groups_ops;
2411 extern long ext4_mb_stats;
2412 extern long ext4_mb_max_to_scan;
2413 extern int ext4_mb_init(struct super_block *);
2414 extern int ext4_mb_release(struct super_block *);
2415 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2416                                 struct ext4_allocation_request *, int *);
2417 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2418 extern void ext4_discard_preallocations(struct inode *);
2419 extern int __init ext4_init_mballoc(void);
2420 extern void ext4_exit_mballoc(void);
2421 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2422                              struct buffer_head *bh, ext4_fsblk_t block,
2423                              unsigned long count, int flags);
2424 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2425                                    ext4_group_t ngroups);
2426 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2427                 ext4_group_t i, struct ext4_group_desc *desc);
2428 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2429                                 ext4_fsblk_t block, unsigned long count);
2430 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2431 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2432
2433 /* inode.c */
2434 int ext4_inode_is_fast_symlink(struct inode *inode);
2435 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2436 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2437 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2438                      bool wait, struct buffer_head **bhs);
2439 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2440                              struct buffer_head *bh_result, int create);
2441 int ext4_get_block(struct inode *inode, sector_t iblock,
2442                    struct buffer_head *bh_result, int create);
2443 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2444                        struct buffer_head *bh_result, int create);
2445 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2446                            struct buffer_head *bh, int create);
2447 int ext4_walk_page_buffers(handle_t *handle,
2448                            struct buffer_head *head,
2449                            unsigned from,
2450                            unsigned to,
2451                            int *partial,
2452                            int (*fn)(handle_t *handle,
2453                                      struct buffer_head *bh));
2454 int do_journal_get_write_access(handle_t *handle,
2455                                 struct buffer_head *bh);
2456 #define FALL_BACK_TO_NONDELALLOC 1
2457 #define CONVERT_INLINE_DATA      2
2458
2459 typedef enum {
2460         EXT4_IGET_NORMAL =      0,
2461         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2462         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2463 } ext4_iget_flags;
2464
2465 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2466                                  ext4_iget_flags flags, const char *function,
2467                                  unsigned int line);
2468
2469 #define ext4_iget(sb, ino, flags) \
2470         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2471
2472 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2473 extern int  ext4_setattr(struct dentry *, struct iattr *);
2474 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2475 extern void ext4_evict_inode(struct inode *);
2476 extern void ext4_clear_inode(struct inode *);
2477 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2478 extern int  ext4_sync_inode(handle_t *, struct inode *);
2479 extern void ext4_dirty_inode(struct inode *, int);
2480 extern int ext4_change_inode_journal_flag(struct inode *, int);
2481 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2482 extern int ext4_inode_attach_jinode(struct inode *inode);
2483 extern int ext4_can_truncate(struct inode *inode);
2484 extern int ext4_truncate(struct inode *);
2485 extern int ext4_break_layouts(struct inode *);
2486 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2487 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2488 extern void ext4_set_inode_flags(struct inode *);
2489 extern int ext4_alloc_da_blocks(struct inode *inode);
2490 extern void ext4_set_aops(struct inode *inode);
2491 extern int ext4_writepage_trans_blocks(struct inode *);
2492 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2493 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2494                              loff_t lstart, loff_t lend);
2495 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2496 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2497 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2498 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2499 extern void ext4_da_release_space(struct inode *inode, int to_free);
2500 extern void ext4_da_update_reserve_space(struct inode *inode,
2501                                         int used, int quota_claim);
2502 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2503                               ext4_fsblk_t pblk, ext4_lblk_t len);
2504
2505 /* indirect.c */
2506 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2507                                 struct ext4_map_blocks *map, int flags);
2508 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2509 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2510 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2511 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2512                                  ext4_lblk_t start, ext4_lblk_t end);
2513
2514 /* ioctl.c */
2515 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2516 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2517
2518 /* migrate.c */
2519 extern int ext4_ext_migrate(struct inode *);
2520 extern int ext4_ind_migrate(struct inode *inode);
2521
2522 /* namei.c */
2523 extern int ext4_dirent_csum_verify(struct inode *inode,
2524                                    struct ext4_dir_entry *dirent);
2525 extern int ext4_orphan_add(handle_t *, struct inode *);
2526 extern int ext4_orphan_del(handle_t *, struct inode *);
2527 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2528                                 __u32 start_minor_hash, __u32 *next_hash);
2529 extern int ext4_search_dir(struct buffer_head *bh,
2530                            char *search_buf,
2531                            int buf_size,
2532                            struct inode *dir,
2533                            struct ext4_filename *fname,
2534                            unsigned int offset,
2535                            struct ext4_dir_entry_2 **res_dir);
2536 extern int ext4_generic_delete_entry(handle_t *handle,
2537                                      struct inode *dir,
2538                                      struct ext4_dir_entry_2 *de_del,
2539                                      struct buffer_head *bh,
2540                                      void *entry_buf,
2541                                      int buf_size,
2542                                      int csum_size);
2543 extern bool ext4_empty_dir(struct inode *inode);
2544
2545 /* resize.c */
2546 extern int ext4_group_add(struct super_block *sb,
2547                                 struct ext4_new_group_data *input);
2548 extern int ext4_group_extend(struct super_block *sb,
2549                                 struct ext4_super_block *es,
2550                                 ext4_fsblk_t n_blocks_count);
2551 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2552
2553 /* super.c */
2554 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2555                                          sector_t block, int op_flags);
2556 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2557 extern int ext4_calculate_overhead(struct super_block *sb);
2558 extern void ext4_superblock_csum_set(struct super_block *sb);
2559 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2560 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2561 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2562                                     ext4_group_t ngroup);
2563 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2564                                      char nbuf[16]);
2565 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2566                                              ext4_group_t block_group,
2567                                              unsigned int flags);
2568
2569 extern __printf(4, 5)
2570 void __ext4_error(struct super_block *, const char *, unsigned int,
2571                   const char *, ...);
2572 extern __printf(5, 6)
2573 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2574                       const char *, ...);
2575 extern __printf(5, 6)
2576 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2577                      const char *, ...);
2578 extern void __ext4_std_error(struct super_block *, const char *,
2579                              unsigned int, int);
2580 extern __printf(4, 5)
2581 void __ext4_abort(struct super_block *, const char *, unsigned int,
2582                   const char *, ...);
2583 extern __printf(4, 5)
2584 void __ext4_warning(struct super_block *, const char *, unsigned int,
2585                     const char *, ...);
2586 extern __printf(4, 5)
2587 void __ext4_warning_inode(const struct inode *inode, const char *function,
2588                           unsigned int line, const char *fmt, ...);
2589 extern __printf(3, 4)
2590 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2591 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2592                            const char *, unsigned int, const char *);
2593 extern __printf(7, 8)
2594 void __ext4_grp_locked_error(const char *, unsigned int,
2595                              struct super_block *, ext4_group_t,
2596                              unsigned long, ext4_fsblk_t,
2597                              const char *, ...);
2598
2599 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2600         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2601
2602 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2603         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2604
2605 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2606         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2607
2608 #ifdef CONFIG_PRINTK
2609
2610 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2611         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2612 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2613         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2614 #define ext4_error(sb, fmt, ...)                                        \
2615         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2616 #define ext4_abort(sb, fmt, ...)                                        \
2617         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2618 #define ext4_warning(sb, fmt, ...)                                      \
2619         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2620 #define ext4_warning_inode(inode, fmt, ...)                             \
2621         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2622 #define ext4_msg(sb, level, fmt, ...)                           \
2623         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2624 #define dump_mmp_msg(sb, mmp, msg)                                      \
2625         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2626 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2627         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2628                                 fmt, ##__VA_ARGS__)
2629
2630 #else
2631
2632 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2633 do {                                                                    \
2634         no_printk(fmt, ##__VA_ARGS__);                                  \
2635         __ext4_error_inode(inode, "", 0, block, " ");                   \
2636 } while (0)
2637 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2638 do {                                                                    \
2639         no_printk(fmt, ##__VA_ARGS__);                                  \
2640         __ext4_error_file(file, "", 0, block, " ");                     \
2641 } while (0)
2642 #define ext4_error(sb, fmt, ...)                                        \
2643 do {                                                                    \
2644         no_printk(fmt, ##__VA_ARGS__);                                  \
2645         __ext4_error(sb, "", 0, " ");                                   \
2646 } while (0)
2647 #define ext4_abort(sb, fmt, ...)                                        \
2648 do {                                                                    \
2649         no_printk(fmt, ##__VA_ARGS__);                                  \
2650         __ext4_abort(sb, "", 0, " ");                                   \
2651 } while (0)
2652 #define ext4_warning(sb, fmt, ...)                                      \
2653 do {                                                                    \
2654         no_printk(fmt, ##__VA_ARGS__);                                  \
2655         __ext4_warning(sb, "", 0, " ");                                 \
2656 } while (0)
2657 #define ext4_warning_inode(inode, fmt, ...)                             \
2658 do {                                                                    \
2659         no_printk(fmt, ##__VA_ARGS__);                                  \
2660         __ext4_warning_inode(inode, "", 0, " ");                        \
2661 } while (0)
2662 #define ext4_msg(sb, level, fmt, ...)                                   \
2663 do {                                                                    \
2664         no_printk(fmt, ##__VA_ARGS__);                                  \
2665         __ext4_msg(sb, "", " ");                                        \
2666 } while (0)
2667 #define dump_mmp_msg(sb, mmp, msg)                                      \
2668         __dump_mmp_msg(sb, mmp, "", 0, "")
2669 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2670 do {                                                                    \
2671         no_printk(fmt, ##__VA_ARGS__);                          \
2672         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2673 } while (0)
2674
2675 #endif
2676
2677 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2678                                         __u32 compat);
2679 extern int ext4_update_rocompat_feature(handle_t *handle,
2680                                         struct super_block *sb, __u32 rocompat);
2681 extern int ext4_update_incompat_feature(handle_t *handle,
2682                                         struct super_block *sb, __u32 incompat);
2683 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2684                                       struct ext4_group_desc *bg);
2685 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2686                                       struct ext4_group_desc *bg);
2687 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2688                                      struct ext4_group_desc *bg);
2689 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2690                                       struct ext4_group_desc *bg);
2691 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2692                                  struct ext4_group_desc *bg);
2693 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2694                                 struct ext4_group_desc *bg);
2695 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2696                                    struct ext4_group_desc *bg);
2697 extern void ext4_block_bitmap_set(struct super_block *sb,
2698                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2699 extern void ext4_inode_bitmap_set(struct super_block *sb,
2700                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2701 extern void ext4_inode_table_set(struct super_block *sb,
2702                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2703 extern void ext4_free_group_clusters_set(struct super_block *sb,
2704                                          struct ext4_group_desc *bg,
2705                                          __u32 count);
2706 extern void ext4_free_inodes_set(struct super_block *sb,
2707                                 struct ext4_group_desc *bg, __u32 count);
2708 extern void ext4_used_dirs_set(struct super_block *sb,
2709                                 struct ext4_group_desc *bg, __u32 count);
2710 extern void ext4_itable_unused_set(struct super_block *sb,
2711                                    struct ext4_group_desc *bg, __u32 count);
2712 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2713                                        struct ext4_group_desc *gdp);
2714 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2715                                      struct ext4_group_desc *gdp);
2716 extern int ext4_register_li_request(struct super_block *sb,
2717                                     ext4_group_t first_not_zeroed);
2718
2719 static inline int ext4_has_metadata_csum(struct super_block *sb)
2720 {
2721         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2722                      !EXT4_SB(sb)->s_chksum_driver);
2723
2724         return ext4_has_feature_metadata_csum(sb) &&
2725                (EXT4_SB(sb)->s_chksum_driver != NULL);
2726 }
2727
2728 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2729 {
2730         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2731 }
2732
2733 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2734 {
2735         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2736                 le32_to_cpu(es->s_blocks_count_lo);
2737 }
2738
2739 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2740 {
2741         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2742                 le32_to_cpu(es->s_r_blocks_count_lo);
2743 }
2744
2745 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2746 {
2747         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2748                 le32_to_cpu(es->s_free_blocks_count_lo);
2749 }
2750
2751 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2752                                          ext4_fsblk_t blk)
2753 {
2754         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2755         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2756 }
2757
2758 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2759                                               ext4_fsblk_t blk)
2760 {
2761         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2762         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2763 }
2764
2765 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2766                                            ext4_fsblk_t blk)
2767 {
2768         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2769         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2770 }
2771
2772 static inline loff_t ext4_isize(struct super_block *sb,
2773                                 struct ext4_inode *raw_inode)
2774 {
2775         if (ext4_has_feature_largedir(sb) ||
2776             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2777                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2778                         le32_to_cpu(raw_inode->i_size_lo);
2779
2780         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2781 }
2782
2783 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2784 {
2785         raw_inode->i_size_lo = cpu_to_le32(i_size);
2786         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2787 }
2788
2789 static inline
2790 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2791                                             ext4_group_t group)
2792 {
2793          struct ext4_group_info ***grp_info;
2794          long indexv, indexh;
2795          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2796          grp_info = EXT4_SB(sb)->s_group_info;
2797          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2798          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2799          return grp_info[indexv][indexh];
2800 }
2801
2802 /*
2803  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2804  * the locking protocol documented in the comments of ext4_group_add()
2805  * in resize.c
2806  */
2807 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2808 {
2809         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2810
2811         smp_rmb();
2812         return ngroups;
2813 }
2814
2815 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2816                                              ext4_group_t block_group)
2817 {
2818         return block_group >> sbi->s_log_groups_per_flex;
2819 }
2820
2821 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2822 {
2823         return 1 << sbi->s_log_groups_per_flex;
2824 }
2825
2826 #define ext4_std_error(sb, errno)                               \
2827 do {                                                            \
2828         if ((errno))                                            \
2829                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2830 } while (0)
2831
2832 #ifdef CONFIG_SMP
2833 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2834  * counters. So we need to make sure we have free clusters more
2835  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2836  */
2837 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2838 #else
2839 #define EXT4_FREECLUSTERS_WATERMARK 0
2840 #endif
2841
2842 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2843 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2844 {
2845         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2846                      !inode_is_locked(inode));
2847         down_write(&EXT4_I(inode)->i_data_sem);
2848         if (newsize > EXT4_I(inode)->i_disksize)
2849                 EXT4_I(inode)->i_disksize = newsize;
2850         up_write(&EXT4_I(inode)->i_data_sem);
2851 }
2852
2853 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2854 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2855 {
2856         int changed = 0;
2857
2858         if (newsize > inode->i_size) {
2859                 i_size_write(inode, newsize);
2860                 changed = 1;
2861         }
2862         if (newsize > EXT4_I(inode)->i_disksize) {
2863                 ext4_update_i_disksize(inode, newsize);
2864                 changed |= 2;
2865         }
2866         return changed;
2867 }
2868
2869 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2870                                       loff_t len);
2871
2872 struct ext4_group_info {
2873         unsigned long   bb_state;
2874         struct rb_root  bb_free_root;
2875         ext4_grpblk_t   bb_first_free;  /* first free block */
2876         ext4_grpblk_t   bb_free;        /* total free blocks */
2877         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2878         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2879         struct          list_head bb_prealloc_list;
2880 #ifdef DOUBLE_CHECK
2881         void            *bb_bitmap;
2882 #endif
2883         struct rw_semaphore alloc_sem;
2884         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2885                                          * regions, index is order.
2886                                          * bb_counters[3] = 5 means
2887                                          * 5 free 8-block regions. */
2888 };
2889
2890 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2891 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2892 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2893 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2894 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
2895         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2896 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
2897         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
2898
2899 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2900         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2901 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2902         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2903 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2904         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2905
2906 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2907         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2908 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2909         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2910 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2911         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2912
2913 #define EXT4_MAX_CONTENTION             8
2914 #define EXT4_CONTENTION_THRESHOLD       2
2915
2916 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2917                                               ext4_group_t group)
2918 {
2919         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2920 }
2921
2922 /*
2923  * Returns true if the filesystem is busy enough that attempts to
2924  * access the block group locks has run into contention.
2925  */
2926 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2927 {
2928         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2929 }
2930
2931 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2932 {
2933         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2934         if (spin_trylock(lock))
2935                 /*
2936                  * We're able to grab the lock right away, so drop the
2937                  * lock contention counter.
2938                  */
2939                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2940         else {
2941                 /*
2942                  * The lock is busy, so bump the contention counter,
2943                  * and then wait on the spin lock.
2944                  */
2945                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2946                                   EXT4_MAX_CONTENTION);
2947                 spin_lock(lock);
2948         }
2949 }
2950
2951 static inline void ext4_unlock_group(struct super_block *sb,
2952                                         ext4_group_t group)
2953 {
2954         spin_unlock(ext4_group_lock_ptr(sb, group));
2955 }
2956
2957 /*
2958  * Block validity checking
2959  */
2960 #define ext4_check_indirect_blockref(inode, bh)                         \
2961         ext4_check_blockref(__func__, __LINE__, inode,                  \
2962                             (__le32 *)(bh)->b_data,                     \
2963                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2964
2965 #define ext4_ind_check_inode(inode)                                     \
2966         ext4_check_blockref(__func__, __LINE__, inode,                  \
2967                             EXT4_I(inode)->i_data,                      \
2968                             EXT4_NDIR_BLOCKS)
2969
2970 /*
2971  * Inodes and files operations
2972  */
2973
2974 /* dir.c */
2975 extern const struct file_operations ext4_dir_operations;
2976
2977 /* file.c */
2978 extern const struct inode_operations ext4_file_inode_operations;
2979 extern const struct file_operations ext4_file_operations;
2980 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2981
2982 /* inline.c */
2983 extern int ext4_get_max_inline_size(struct inode *inode);
2984 extern int ext4_find_inline_data_nolock(struct inode *inode);
2985 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2986                                  unsigned int len);
2987 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2988
2989 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2990 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2991                                          struct inode *inode,
2992                                          loff_t pos, unsigned len,
2993                                          unsigned flags,
2994                                          struct page **pagep);
2995 extern int ext4_write_inline_data_end(struct inode *inode,
2996                                       loff_t pos, unsigned len,
2997                                       unsigned copied,
2998                                       struct page *page);
2999 extern struct buffer_head *
3000 ext4_journalled_write_inline_data(struct inode *inode,
3001                                   unsigned len,
3002                                   struct page *page);
3003 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3004                                            struct inode *inode,
3005                                            loff_t pos, unsigned len,
3006                                            unsigned flags,
3007                                            struct page **pagep,
3008                                            void **fsdata);
3009 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3010                                          unsigned len, unsigned copied,
3011                                          struct page *page);
3012 extern int ext4_try_add_inline_entry(handle_t *handle,
3013                                      struct ext4_filename *fname,
3014                                      struct inode *dir, struct inode *inode);
3015 extern int ext4_try_create_inline_dir(handle_t *handle,
3016                                       struct inode *parent,
3017                                       struct inode *inode);
3018 extern int ext4_read_inline_dir(struct file *filp,
3019                                 struct dir_context *ctx,
3020                                 int *has_inline_data);
3021 extern int htree_inlinedir_to_tree(struct file *dir_file,
3022                                    struct inode *dir, ext4_lblk_t block,
3023                                    struct dx_hash_info *hinfo,
3024                                    __u32 start_hash, __u32 start_minor_hash,
3025                                    int *has_inline_data);
3026 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3027                                         struct ext4_filename *fname,
3028                                         struct ext4_dir_entry_2 **res_dir,
3029                                         int *has_inline_data);
3030 extern int ext4_delete_inline_entry(handle_t *handle,
3031                                     struct inode *dir,
3032                                     struct ext4_dir_entry_2 *de_del,
3033                                     struct buffer_head *bh,
3034                                     int *has_inline_data);
3035 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3036 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3037                                         struct ext4_dir_entry_2 **parent_de,
3038                                         int *retval);
3039 extern int ext4_inline_data_fiemap(struct inode *inode,
3040                                    struct fiemap_extent_info *fieinfo,
3041                                    int *has_inline, __u64 start, __u64 len);
3042
3043 struct iomap;
3044 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3045
3046 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3047
3048 extern int ext4_convert_inline_data(struct inode *inode);
3049
3050 static inline int ext4_has_inline_data(struct inode *inode)
3051 {
3052         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3053                EXT4_I(inode)->i_inline_off;
3054 }
3055
3056 /* namei.c */
3057 extern const struct inode_operations ext4_dir_inode_operations;
3058 extern const struct inode_operations ext4_special_inode_operations;
3059 extern struct dentry *ext4_get_parent(struct dentry *child);
3060 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3061                                  struct ext4_dir_entry_2 *de,
3062                                  int blocksize, int csum_size,
3063                                  unsigned int parent_ino, int dotdot_real_len);
3064 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3065                                    unsigned int blocksize);
3066 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3067                                          struct inode *inode,
3068                                          struct buffer_head *bh);
3069 #define S_SHIFT 12
3070 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3071         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3072         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3073         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3074         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3075         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3076         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3077         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3078 };
3079
3080 static inline void ext4_set_de_type(struct super_block *sb,
3081                                 struct ext4_dir_entry_2 *de,
3082                                 umode_t mode) {
3083         if (ext4_has_feature_filetype(sb))
3084                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3085 }
3086
3087 /* readpages.c */
3088 extern int ext4_mpage_readpages(struct address_space *mapping,
3089                                 struct list_head *pages, struct page *page,
3090                                 unsigned nr_pages, bool is_readahead);
3091
3092 /* symlink.c */
3093 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3094 extern const struct inode_operations ext4_symlink_inode_operations;
3095 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3096
3097 /* sysfs.c */
3098 extern int ext4_register_sysfs(struct super_block *sb);
3099 extern void ext4_unregister_sysfs(struct super_block *sb);
3100 extern int __init ext4_init_sysfs(void);
3101 extern void ext4_exit_sysfs(void);
3102
3103 /* block_validity */
3104 extern void ext4_release_system_zone(struct super_block *sb);
3105 extern int ext4_setup_system_zone(struct super_block *sb);
3106 extern int __init ext4_init_system_zone(void);
3107 extern void ext4_exit_system_zone(void);
3108 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3109                                  ext4_fsblk_t start_blk,
3110                                  unsigned int count);
3111 extern int ext4_check_blockref(const char *, unsigned int,
3112                                struct inode *, __le32 *, unsigned int);
3113
3114 /* extents.c */
3115 struct ext4_ext_path;
3116 struct ext4_extent;
3117
3118 /*
3119  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3120  * __le32.
3121  */
3122 #define EXT_MAX_BLOCKS  0xffffffff
3123
3124 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3125 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3126 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3127 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3128                                struct ext4_map_blocks *map, int flags);
3129 extern int ext4_ext_truncate(handle_t *, struct inode *);
3130 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3131                                  ext4_lblk_t end);
3132 extern void ext4_ext_init(struct super_block *);
3133 extern void ext4_ext_release(struct super_block *);
3134 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3135                           loff_t len);
3136 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3137                                           loff_t offset, ssize_t len);
3138 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3139                            struct ext4_map_blocks *map, int flags);
3140 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3141                                          ext4_lblk_t lblocks);
3142 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3143                                                    int num,
3144                                                    struct ext4_ext_path *path);
3145 extern int ext4_can_extents_be_merged(struct inode *inode,
3146                                       struct ext4_extent *ex1,
3147                                       struct ext4_extent *ex2);
3148 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3149                                   struct ext4_ext_path **,
3150                                   struct ext4_extent *, int);
3151 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3152                                               struct ext4_ext_path **,
3153                                               int flags);
3154 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3155 extern int ext4_ext_check_inode(struct inode *inode);
3156 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3157 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3158                         __u64 start, __u64 len);
3159 extern int ext4_ext_precache(struct inode *inode);
3160 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3161 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3162 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3163                                 struct inode *inode2, ext4_lblk_t lblk1,
3164                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3165                              int mark_unwritten,int *err);
3166 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3167
3168 /* move_extent.c */
3169 extern void ext4_double_down_write_data_sem(struct inode *first,
3170                                             struct inode *second);
3171 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3172                                           struct inode *donor_inode);
3173 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3174                              __u64 start_orig, __u64 start_donor,
3175                              __u64 len, __u64 *moved_len);
3176
3177 /* page-io.c */
3178 extern int __init ext4_init_pageio(void);
3179 extern void ext4_exit_pageio(void);
3180 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3181 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3182 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3183 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3184 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3185                                 struct writeback_control *wbc);
3186 extern void ext4_end_io_rsv_work(struct work_struct *work);
3187 extern void ext4_io_submit(struct ext4_io_submit *io);
3188 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3189                                struct page *page,
3190                                int len,
3191                                struct writeback_control *wbc,
3192                                bool keep_towrite);
3193
3194 /* mmp.c */
3195 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3196
3197 /*
3198  * Add new method to test whether block and inode bitmaps are properly
3199  * initialized. With uninit_bg reading the block from disk is not enough
3200  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3201  */
3202 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3203
3204 static inline int bitmap_uptodate(struct buffer_head *bh)
3205 {
3206         return (buffer_uptodate(bh) &&
3207                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3208 }
3209 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3210 {
3211         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3212 }
3213
3214 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3215
3216 /* For ioend & aio unwritten conversion wait queues */
3217 #define EXT4_WQ_HASH_SZ         37
3218 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3219                                             EXT4_WQ_HASH_SZ])
3220 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3221
3222 extern int ext4_resize_begin(struct super_block *sb);
3223 extern void ext4_resize_end(struct super_block *sb);
3224
3225 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3226                                               struct ext4_io_end *io_end)
3227 {
3228         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3229                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3230                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3231         }
3232 }
3233
3234 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3235 {
3236         struct inode *inode = io_end->inode;
3237
3238         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3239                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3240                 /* Wake up anyone waiting on unwritten extent conversion */
3241                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3242                         wake_up_all(ext4_ioend_wq(inode));
3243         }
3244 }
3245
3246 extern const struct iomap_ops ext4_iomap_ops;
3247
3248 #endif  /* __KERNEL__ */
3249
3250 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3251 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3252
3253 #endif  /* _EXT4_H */