fs/ext4/ext4.h

   1 /*
   2  *  ext4.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card ([email protected])
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _EXT4_H
  17 #define _EXT4_H
  18
  19 #include <linux/types.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/magic.h>
  22 #include <linux/jbd2.h>
  23 #include <linux/quota.h>
  24 #include <linux/rwsem.h>
  25 #include <linux/rbtree.h>
  26 #include <linux/seqlock.h>
  27 #include <linux/mutex.h>
  28 #include <linux/timer.h>
  29 #include <linux/version.h>
  30 #include <linux/wait.h>
  31 #include <linux/sched/signal.h>
  32 #include <linux/blockgroup_lock.h>
  33 #include <linux/percpu_counter.h>
  34 #include <linux/ratelimit.h>
  35 #include <crypto/hash.h>
  36 #ifdef CONFIG_EXT4_FS_ENCRYPTION
  37 #include <linux/fscrypt_supp.h>
  38 #else
  39 #include <linux/fscrypt_notsupp.h>
  40 #endif
  41 #include <linux/falloc.h>
  42 #include <linux/percpu-rwsem.h>
  43 #ifdef __KERNEL__
  44 #include <linux/compat.h>
  45 #endif
  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 /* Mask out flags that are inappropriate for the given type of inode. */
 429 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 430 {
 431         if (S_ISDIR(mode))
 432                 return flags;
 433         else if (S_ISREG(mode))
 434                 return flags & EXT4_REG_FLMASK;
 435         else
 436                 return flags & EXT4_OTHER_FLMASK;
 437 }
 438
 439 /*
 440  * Inode flags used for atomic set/get
 441  */
 442 enum {
 443         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 444         EXT4_INODE_UNRM         = 1,    /* Undelete */
 445         EXT4_INODE_COMPR        = 2,    /* Compress file */
 446         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 447         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 448         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 449         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 450         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 451 /* Reserved for compression usage... */
 452         EXT4_INODE_DIRTY        = 8,
 453         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 454         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 455         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 456 /* End compression flags --- maybe not all used */
 457         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 458         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 459         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 460         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 461         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 462         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 463         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 464         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 465         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 466         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 467         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 468         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 469         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 470 };
 471
 472 /*
 473  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 474  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 475  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 476  * any extra space in the compiled kernel image, otherwise, the build will fail.
 477  * It's important that these values are the same, since we are using
 478  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 479  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 480  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 481  * defined in e2fsprogs.
 482  *
 483  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 484  */
 485 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 486 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 487
 488 static inline void ext4_check_flag_values(void)
 489 {
 490         CHECK_FLAG_VALUE(SECRM);
 491         CHECK_FLAG_VALUE(UNRM);
 492         CHECK_FLAG_VALUE(COMPR);
 493         CHECK_FLAG_VALUE(SYNC);
 494         CHECK_FLAG_VALUE(IMMUTABLE);
 495         CHECK_FLAG_VALUE(APPEND);
 496         CHECK_FLAG_VALUE(NODUMP);
 497         CHECK_FLAG_VALUE(NOATIME);
 498         CHECK_FLAG_VALUE(DIRTY);
 499         CHECK_FLAG_VALUE(COMPRBLK);
 500         CHECK_FLAG_VALUE(NOCOMPR);
 501         CHECK_FLAG_VALUE(ENCRYPT);
 502         CHECK_FLAG_VALUE(INDEX);
 503         CHECK_FLAG_VALUE(IMAGIC);
 504         CHECK_FLAG_VALUE(JOURNAL_DATA);
 505         CHECK_FLAG_VALUE(NOTAIL);
 506         CHECK_FLAG_VALUE(DIRSYNC);
 507         CHECK_FLAG_VALUE(TOPDIR);
 508         CHECK_FLAG_VALUE(HUGE_FILE);
 509         CHECK_FLAG_VALUE(EXTENTS);
 510         CHECK_FLAG_VALUE(EA_INODE);
 511         CHECK_FLAG_VALUE(EOFBLOCKS);
 512         CHECK_FLAG_VALUE(INLINE_DATA);
 513         CHECK_FLAG_VALUE(PROJINHERIT);
 514         CHECK_FLAG_VALUE(RESERVED);
 515 }
 516
 517 /* Used to pass group descriptor data when online resize is done */
 518 struct ext4_new_group_input {
 519         __u32 group;            /* Group number for this data */
 520         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 521         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 522         __u64 inode_table;      /* Absolute block number of inode table start */
 523         __u32 blocks_count;     /* Total number of blocks in this group */
 524         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 525         __u16 unused;
 526 };
 527
 528 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 529 struct compat_ext4_new_group_input {
 530         u32 group;
 531         compat_u64 block_bitmap;
 532         compat_u64 inode_bitmap;
 533         compat_u64 inode_table;
 534         u32 blocks_count;
 535         u16 reserved_blocks;
 536         u16 unused;
 537 };
 538 #endif
 539
 540 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 541 struct ext4_new_group_data {
 542         __u32 group;
 543         __u64 block_bitmap;
 544         __u64 inode_bitmap;
 545         __u64 inode_table;
 546         __u32 blocks_count;
 547         __u16 reserved_blocks;
 548         __u16 unused;
 549         __u32 free_blocks_count;
 550 };
 551
 552 /* Indexes used to index group tables in ext4_new_group_data */
 553 enum {
 554         BLOCK_BITMAP = 0,       /* block bitmap */
 555         INODE_BITMAP,           /* inode bitmap */
 556         INODE_TABLE,            /* inode tables */
 557         GROUP_TABLE_COUNT,
 558 };
 559
 560 /*
 561  * Flags used by ext4_map_blocks()
 562  */
 563         /* Allocate any needed blocks and/or convert an unwritten
 564            extent to be an initialized ext4 */
 565 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 566         /* Request the creation of an unwritten extent */
 567 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 568 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 569                                                  EXT4_GET_BLOCKS_CREATE)
 570         /* Caller is from the delayed allocation writeout path
 571          * finally doing the actual allocation of delayed blocks */
 572 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 573         /* caller is from the direct IO path, request to creation of an
 574         unwritten extents if not allocated, split the unwritten
 575         extent if blocks has been preallocated already*/
 576 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 577 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 578 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 579                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 580         /* Convert extent to initialized after IO complete */
 581 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 582                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 583         /* Eventual metadata allocation (due to growing extent tree)
 584          * should not fail, so try to use reserved blocks for that.*/
 585 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 586         /* Don't normalize allocation size (used for fallocate) */
 587 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 588         /* Request will not result in inode size update (user for fallocate) */
 589 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 590         /* Convert written extents to unwritten */
 591 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 592         /* Write zeros to newly created written extents */
 593 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 594 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 595                                         EXT4_GET_BLOCKS_ZERO)
 596         /* Caller will submit data before dropping transaction handle. This
 597          * allows jbd2 to avoid submitting data before commit. */
 598 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 599
 600 /*
 601  * The bit position of these flags must not overlap with any of the
 602  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 603  * read_extent_tree_block(), ext4_split_extent_at(),
 604  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 605  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 606  * caching the extents when reading from the extent tree while a
 607  * truncate or punch hole operation is in progress.
 608  */
 609 #define EXT4_EX_NOCACHE                         0x40000000
 610 #define EXT4_EX_FORCE_CACHE                     0x20000000
 611
 612 /*
 613  * Flags used by ext4_free_blocks
 614  */
 615 #define EXT4_FREE_BLOCKS_METADATA       0x0001
 616 #define EXT4_FREE_BLOCKS_FORGET         0x0002
 617 #define EXT4_FREE_BLOCKS_VALIDATED      0x0004
 618 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
 619 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 620 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 621
 622 /*
 623  * ioctl commands
 624  */
 625 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 626 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 627 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 628 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 629 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 630 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 631 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 632 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 633 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 634 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 635 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 636  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 637  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 638 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 639 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 640 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 641 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 642 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 643 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 644 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 645 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 646
 647 #ifndef FS_IOC_FSGETXATTR
 648 /* Until the uapi changes get merged for project quota... */
 649
 650 #define FS_IOC_FSGETXATTR               _IOR('X', 31, struct fsxattr)
 651 #define FS_IOC_FSSETXATTR               _IOW('X', 32, struct fsxattr)
 652
 653 /*
 654  * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
 655  */
 656 struct fsxattr {
 657         __u32           fsx_xflags;     /* xflags field value (get/set) */
 658         __u32           fsx_extsize;    /* extsize field value (get/set)*/
 659         __u32           fsx_nextents;   /* nextents field value (get)   */
 660         __u32           fsx_projid;     /* project identifier (get/set) */
 661         unsigned char   fsx_pad[12];
 662 };
 663
 664 /*
 665  * Flags for the fsx_xflags field
 666  */
 667 #define FS_XFLAG_REALTIME       0x00000001      /* data in realtime volume */
 668 #define FS_XFLAG_PREALLOC       0x00000002      /* preallocated file extents */
 669 #define FS_XFLAG_IMMUTABLE      0x00000008      /* file cannot be modified */
 670 #define FS_XFLAG_APPEND         0x00000010      /* all writes append */
 671 #define FS_XFLAG_SYNC           0x00000020      /* all writes synchronous */
 672 #define FS_XFLAG_NOATIME        0x00000040      /* do not update access time */
 673 #define FS_XFLAG_NODUMP         0x00000080      /* do not include in backups */
 674 #define FS_XFLAG_RTINHERIT      0x00000100      /* create with rt bit set */
 675 #define FS_XFLAG_PROJINHERIT    0x00000200      /* create with parents projid */
 676 #define FS_XFLAG_NOSYMLINKS     0x00000400      /* disallow symlink creation */
 677 #define FS_XFLAG_EXTSIZE        0x00000800      /* extent size allocator hint */
 678 #define FS_XFLAG_EXTSZINHERIT   0x00001000      /* inherit inode extent size */
 679 #define FS_XFLAG_NODEFRAG       0x00002000      /* do not defragment */
 680 #define FS_XFLAG_FILESTREAM     0x00004000      /* use filestream allocator */
 681 #define FS_XFLAG_HASATTR        0x80000000      /* no DIFLAG for this */
 682 #endif /* !defined(FS_IOC_FSGETXATTR) */
 683
 684 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 685 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 686
 687 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 688
 689 /*
 690  * Flags for going down operation
 691  */
 692 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 693 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 694 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 695
 696
 697 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 698 /*
 699  * ioctl commands in 32 bit emulation
 700  */
 701 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 702 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 703 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 704 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 705 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 706 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 707 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 708 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 709 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 710 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 711 #endif
 712
 713 /* Max physical block we can address w/o extents */
 714 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 715
 716 /*
 717  * Structure of an inode on the disk
 718  */
 719 struct ext4_inode {
 720         __le16  i_mode;         /* File mode */
 721         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 722         __le32  i_size_lo;      /* Size in bytes */
 723         __le32  i_atime;        /* Access time */
 724         __le32  i_ctime;        /* Inode Change time */
 725         __le32  i_mtime;        /* Modification time */
 726         __le32  i_dtime;        /* Deletion Time */
 727         __le16  i_gid;          /* Low 16 bits of Group Id */
 728         __le16  i_links_count;  /* Links count */
 729         __le32  i_blocks_lo;    /* Blocks count */
 730         __le32  i_flags;        /* File flags */
 731         union {
 732                 struct {
 733                         __le32  l_i_version;
 734                 } linux1;
 735                 struct {
 736                         __u32  h_i_translator;
 737                 } hurd1;
 738                 struct {
 739                         __u32  m_i_reserved1;
 740                 } masix1;
 741         } osd1;                         /* OS dependent 1 */
 742         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 743         __le32  i_generation;   /* File version (for NFS) */
 744         __le32  i_file_acl_lo;  /* File ACL */
 745         __le32  i_size_high;
 746         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 747         union {
 748                 struct {
 749                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 750                         __le16  l_i_file_acl_high;
 751                         __le16  l_i_uid_high;   /* these 2 fields */
 752                         __le16  l_i_gid_high;   /* were reserved2[0] */
 753                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 754                         __le16  l_i_reserved;
 755                 } linux2;
 756                 struct {
 757                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 758                         __u16   h_i_mode_high;
 759                         __u16   h_i_uid_high;
 760                         __u16   h_i_gid_high;
 761                         __u32   h_i_author;
 762                 } hurd2;
 763                 struct {
 764                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 765                         __le16  m_i_file_acl_high;
 766                         __u32   m_i_reserved2[2];
 767                 } masix2;
 768         } osd2;                         /* OS dependent 2 */
 769         __le16  i_extra_isize;
 770         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 771         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 772         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 773         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 774         __le32  i_crtime;       /* File Creation time */
 775         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 776         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 777         __le32  i_projid;       /* Project ID */
 778 };
 779
 780 struct move_extent {
 781         __u32 reserved;         /* should be zero */
 782         __u32 donor_fd;         /* donor file descriptor */
 783         __u64 orig_start;       /* logical start offset in block for orig */
 784         __u64 donor_start;      /* logical start offset in block for donor */
 785         __u64 len;              /* block length to be moved */
 786         __u64 moved_len;        /* moved block length */
 787 };
 788
 789 #define EXT4_EPOCH_BITS 2
 790 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 791 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 792
 793 /*
 794  * Extended fields will fit into an inode if the filesystem was formatted
 795  * with large inodes (-I 256 or larger) and there are not currently any EAs
 796  * consuming all of the available space. For new inodes we always reserve
 797  * enough space for the kernel's known extended fields, but for inodes
 798  * created with an old kernel this might not have been the case. None of
 799  * the extended inode fields is critical for correct filesystem operation.
 800  * This macro checks if a certain field fits in the inode. Note that
 801  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 802  */
 803 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 804         ((offsetof(typeof(*ext4_inode), field) +        \
 805           sizeof((ext4_inode)->field))                  \
 806         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 807             (einode)->i_extra_isize))                   \
 808
 809 /*
 810  * We use an encoding that preserves the times for extra epoch "00":
 811  *
 812  * extra  msb of                         adjust for signed
 813  * epoch  32-bit                         32-bit tv_sec to
 814  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 815  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 816  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 817  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 818  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 819  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 820  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 821  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 822  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 823  *
 824  * Note that previous versions of the kernel on 64-bit systems would
 825  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 826  * 1970.  e2fsck will correct this, assuming that it is run on the
 827  * affected filesystem before 2242.
 828  */
 829
 830 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 831 {
 832         u32 extra = sizeof(time->tv_sec) > 4 ?
 833                 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
 834         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 835 }
 836
 837 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 838 {
 839         if (unlikely(sizeof(time->tv_sec) > 4 &&
 840                         (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
 841 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
 842                 /* Handle legacy encoding of pre-1970 dates with epoch
 843                  * bits 1,1.  We assume that by kernel version 4.20,
 844                  * everyone will have run fsck over the affected
 845                  * filesystems to correct the problem.  (This
 846                  * backwards compatibility may be removed before this
 847                  * time, at the discretion of the ext4 developers.)
 848                  */
 849                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 850                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 851                         extra_bits = 0;
 852                 time->tv_sec += extra_bits << 32;
 853 #else
 854                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 855 #endif
 856         }
 857         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 858 }
 859
 860 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 861 do {                                                                           \
 862         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 863         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 864                 (raw_inode)->xtime ## _extra =                                 \
 865                                 ext4_encode_extra_time(&(inode)->xtime);       \
 866 } while (0)
 867
 868 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 869 do {                                                                           \
 870         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 871                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 872         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 873                 (raw_inode)->xtime ## _extra =                                 \
 874                                 ext4_encode_extra_time(&(einode)->xtime);      \
 875 } while (0)
 876
 877 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 878 do {                                                                           \
 879         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 880         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 881                 ext4_decode_extra_time(&(inode)->xtime,                        \
 882                                        raw_inode->xtime ## _extra);            \
 883         else                                                                   \
 884                 (inode)->xtime.tv_nsec = 0;                                    \
 885 } while (0)
 886
 887 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 888 do {                                                                           \
 889         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 890                 (einode)->xtime.tv_sec =                                       \
 891                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 892         else                                                                   \
 893                 (einode)->xtime.tv_sec = 0;                                    \
 894         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 895                 ext4_decode_extra_time(&(einode)->xtime,                       \
 896                                        raw_inode->xtime ## _extra);            \
 897         else                                                                   \
 898                 (einode)->xtime.tv_nsec = 0;                                   \
 899 } while (0)
 900
 901 #define i_disk_version osd1.linux1.l_i_version
 902
 903 #if defined(__KERNEL__) || defined(__linux__)
 904 #define i_reserved1     osd1.linux1.l_i_reserved1
 905 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 906 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 907 #define i_uid_low       i_uid
 908 #define i_gid_low       i_gid
 909 #define i_uid_high      osd2.linux2.l_i_uid_high
 910 #define i_gid_high      osd2.linux2.l_i_gid_high
 911 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 912
 913 #elif defined(__GNU__)
 914
 915 #define i_translator    osd1.hurd1.h_i_translator
 916 #define i_uid_high      osd2.hurd2.h_i_uid_high
 917 #define i_gid_high      osd2.hurd2.h_i_gid_high
 918 #define i_author        osd2.hurd2.h_i_author
 919
 920 #elif defined(__masix__)
 921
 922 #define i_reserved1     osd1.masix1.m_i_reserved1
 923 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 924 #define i_reserved2     osd2.masix2.m_i_reserved2
 925
 926 #endif /* defined(__KERNEL__) || defined(__linux__) */
 927
 928 #include "extents_status.h"
 929
 930 /*
 931  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 932  *
 933  * These are needed to avoid lockdep false positives when we need to
 934  * allocate blocks to the quota inode during ext4_map_blocks(), while
 935  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 936  * do quota tracking for the quota inode, this avoids deadlock (as
 937  * well as infinite recursion, since it isn't turtles all the way
 938  * down...)
 939  *
 940  *  I_DATA_SEM_NORMAL - Used for most inodes
 941  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 942  *                        where the second inode has larger inode number
 943  *                        than the first
 944  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 945  */
 946 enum {
 947         I_DATA_SEM_NORMAL = 0,
 948         I_DATA_SEM_OTHER,
 949         I_DATA_SEM_QUOTA,
 950 };
 951
 952
 953 /*
 954  * fourth extended file system inode data in memory
 955  */
 956 struct ext4_inode_info {
 957         __le32  i_data[15];     /* unconverted */
 958         __u32   i_dtime;
 959         ext4_fsblk_t    i_file_acl;
 960
 961         /*
 962          * i_block_group is the number of the block group which contains
 963          * this file's inode.  Constant across the lifetime of the inode,
 964          * it is ued for making block allocation decisions - we try to
 965          * place a file's data blocks near its inode block, and new inodes
 966          * near to their parent directory's inode.
 967          */
 968         ext4_group_t    i_block_group;
 969         ext4_lblk_t     i_dir_start_lookup;
 970 #if (BITS_PER_LONG < 64)
 971         unsigned long   i_state_flags;          /* Dynamic state flags */
 972 #endif
 973         unsigned long   i_flags;
 974
 975         /*
 976          * Extended attributes can be read independently of the main file
 977          * data. Taking i_mutex even when reading would cause contention
 978          * between readers of EAs and writers of regular file data, so
 979          * instead we synchronize on xattr_sem when reading or changing
 980          * EAs.
 981          */
 982         struct rw_semaphore xattr_sem;
 983
 984         struct list_head i_orphan;      /* unlinked but open inodes */
 985
 986         /*
 987          * i_disksize keeps track of what the inode size is ON DISK, not
 988          * in memory.  During truncate, i_size is set to the new size by
 989          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 990          * set i_disksize to 0 until the truncate is actually under way.
 991          *
 992          * The intent is that i_disksize always represents the blocks which
 993          * are used by this file.  This allows recovery to restart truncate
 994          * on orphans if we crash during truncate.  We actually write i_disksize
 995          * into the on-disk inode when writing inodes out, instead of i_size.
 996          *
 997          * The only time when i_disksize and i_size may be different is when
 998          * a truncate is in progress.  The only things which change i_disksize
 999          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1000          */
1001         loff_t  i_disksize;
1002
1003         /*
1004          * i_data_sem is for serialising ext4_truncate() against
1005          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1006          * data tree are chopped off during truncate. We can't do that in
1007          * ext4 because whenever we perform intermediate commits during
1008          * truncate, the inode and all the metadata blocks *must* be in a
1009          * consistent state which allows truncation of the orphans to restart
1010          * during recovery.  Hence we must fix the get_block-vs-truncate race
1011          * by other means, so we have i_data_sem.
1012          */
1013         struct rw_semaphore i_data_sem;
1014         /*
1015          * i_mmap_sem is for serializing page faults with truncate / punch hole
1016          * operations. We have to make sure that new page cannot be faulted in
1017          * a section of the inode that is being punched. We cannot easily use
1018          * i_data_sem for this since we need protection for the whole punch
1019          * operation and i_data_sem ranks below transaction start so we have
1020          * to occasionally drop it.
1021          */
1022         struct rw_semaphore i_mmap_sem;
1023         struct inode vfs_inode;
1024         struct jbd2_inode *jinode;
1025
1026         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1027
1028         /*
1029          * File creation time. Its function is same as that of
1030          * struct timespec i_{a,c,m}time in the generic inode.
1031          */
1032         struct timespec i_crtime;
1033
1034         /* mballoc */
1035         struct list_head i_prealloc_list;
1036         spinlock_t i_prealloc_lock;
1037
1038         /* extents status tree */
1039         struct ext4_es_tree i_es_tree;
1040         rwlock_t i_es_lock;
1041         struct list_head i_es_list;
1042         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1043         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1044         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1045                                            extents to shrink. Protected by
1046                                            i_es_lock  */
1047
1048         /* ialloc */
1049         ext4_group_t    i_last_alloc_group;
1050
1051         /* allocation reservation info for delalloc */
1052         /* In case of bigalloc, these refer to clusters rather than blocks */
1053         unsigned int i_reserved_data_blocks;
1054         unsigned int i_reserved_meta_blocks;
1055         unsigned int i_allocated_meta_blocks;
1056         ext4_lblk_t i_da_metadata_calc_last_lblock;
1057         int i_da_metadata_calc_len;
1058
1059         /* on-disk additional length */
1060         __u16 i_extra_isize;
1061
1062         /* Indicate the inline data space. */
1063         u16 i_inline_off;
1064         u16 i_inline_size;
1065
1066 #ifdef CONFIG_QUOTA
1067         /* quota space reservation, managed internally by quota code */
1068         qsize_t i_reserved_quota;
1069 #endif
1070
1071         /* Lock protecting lists below */
1072         spinlock_t i_completed_io_lock;
1073         /*
1074          * Completed IOs that need unwritten extents handling and have
1075          * transaction reserved
1076          */
1077         struct list_head i_rsv_conversion_list;
1078         struct work_struct i_rsv_conversion_work;
1079         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1080
1081         spinlock_t i_block_reservation_lock;
1082
1083         /*
1084          * Transactions that contain inode's metadata needed to complete
1085          * fsync and fdatasync, respectively.
1086          */
1087         tid_t i_sync_tid;
1088         tid_t i_datasync_tid;
1089
1090 #ifdef CONFIG_QUOTA
1091         struct dquot *i_dquot[MAXQUOTAS];
1092 #endif
1093
1094         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1095         __u32 i_csum_seed;
1096
1097         kprojid_t i_projid;
1098 };
1099
1100 /*
1101  * File system states
1102  */
1103 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1104 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1105 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1106
1107 /*
1108  * Misc. filesystem flags
1109  */
1110 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1111 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1112 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1113
1114 /*
1115  * Mount flags set via mount options or defaults
1116  */
1117 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1118 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1119 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1120 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1121 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1122 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1123 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1124 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1125 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1126 #ifdef CONFIG_FS_DAX
1127 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1128 #else
1129 #define EXT4_MOUNT_DAX                  0
1130 #endif
1131 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1132 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1133 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1134 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1135 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1136 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1137 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1138 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1139 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1140 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1141 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1142 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1143                                                  * enable enforcement for hidden
1144                                                  * quota files */
1145 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1146                                                   * enforcement for hidden quota
1147                                                   * files */
1148 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1149                                                   * enforcement */
1150 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1151 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1152 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1153 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1154 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1155 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1156 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1157 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1158
1159 /*
1160  * Mount flags set either automatically (could not be set by mount option)
1161  * based on per file system feature or property or in special cases such as
1162  * distinguishing between explicit mount option definition and default.
1163  */
1164 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1165                                                       specified delalloc */
1166 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1167                                                       size of blocksize * 8
1168                                                       blocks */
1169 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1170                                                       file systems */
1171
1172 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1173                                                 specified journal checksum */
1174
1175 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1176                                                 ~EXT4_MOUNT_##opt
1177 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1178                                                 EXT4_MOUNT_##opt
1179 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1180                                          EXT4_MOUNT_##opt)
1181
1182 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1183                                                 ~EXT4_MOUNT2_##opt
1184 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1185                                                 EXT4_MOUNT2_##opt
1186 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1187                                          EXT4_MOUNT2_##opt)
1188
1189 #define ext4_test_and_set_bit           __test_and_set_bit_le
1190 #define ext4_set_bit                    __set_bit_le
1191 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1192 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1193 #define ext4_clear_bit                  __clear_bit_le
1194 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1195 #define ext4_test_bit                   test_bit_le
1196 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1197 #define ext4_find_next_bit              find_next_bit_le
1198
1199 extern void ext4_set_bits(void *bm, int cur, int len);
1200
1201 /*
1202  * Maximal mount counts between two filesystem checks
1203  */
1204 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1205 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1206
1207 /*
1208  * Behaviour when detecting errors
1209  */
1210 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1211 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1212 #define EXT4_ERRORS_PANIC               3       /* Panic */
1213 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1214
1215 /* Metadata checksum algorithm codes */
1216 #define EXT4_CRC32C_CHKSUM              1
1217
1218 /*
1219  * Structure of the super block
1220  */
1221 struct ext4_super_block {
1222 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1223         __le32  s_blocks_count_lo;      /* Blocks count */
1224         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1225         __le32  s_free_blocks_count_lo; /* Free blocks count */
1226 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1227         __le32  s_first_data_block;     /* First Data Block */
1228         __le32  s_log_block_size;       /* Block size */
1229         __le32  s_log_cluster_size;     /* Allocation cluster size */
1230 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1231         __le32  s_clusters_per_group;   /* # Clusters per group */
1232         __le32  s_inodes_per_group;     /* # Inodes per group */
1233         __le32  s_mtime;                /* Mount time */
1234 /*30*/  __le32  s_wtime;                /* Write time */
1235         __le16  s_mnt_count;            /* Mount count */
1236         __le16  s_max_mnt_count;        /* Maximal mount count */
1237         __le16  s_magic;                /* Magic signature */
1238         __le16  s_state;                /* File system state */
1239         __le16  s_errors;               /* Behaviour when detecting errors */
1240         __le16  s_minor_rev_level;      /* minor revision level */
1241 /*40*/  __le32  s_lastcheck;            /* time of last check */
1242         __le32  s_checkinterval;        /* max. time between checks */
1243         __le32  s_creator_os;           /* OS */
1244         __le32  s_rev_level;            /* Revision level */
1245 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1246         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1247         /*
1248          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1249          *
1250          * Note: the difference between the compatible feature set and
1251          * the incompatible feature set is that if there is a bit set
1252          * in the incompatible feature set that the kernel doesn't
1253          * know about, it should refuse to mount the filesystem.
1254          *
1255          * e2fsck's requirements are more strict; if it doesn't know
1256          * about a feature in either the compatible or incompatible
1257          * feature set, it must abort and not try to meddle with
1258          * things it doesn't understand...
1259          */
1260         __le32  s_first_ino;            /* First non-reserved inode */
1261         __le16  s_inode_size;           /* size of inode structure */
1262         __le16  s_block_group_nr;       /* block group # of this superblock */
1263         __le32  s_feature_compat;       /* compatible feature set */
1264 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1265         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1266 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1267 /*78*/  char    s_volume_name[16];      /* volume name */
1268 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
1269 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1270         /*
1271          * Performance hints.  Directory preallocation should only
1272          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1273          */
1274         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1275         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1276         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1277         /*
1278          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1279          */
1280 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1281 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1282         __le32  s_journal_dev;          /* device number of journal file */
1283         __le32  s_last_orphan;          /* start of list of inodes to delete */
1284         __le32  s_hash_seed[4];         /* HTREE hash seed */
1285         __u8    s_def_hash_version;     /* Default hash version to use */
1286         __u8    s_jnl_backup_type;
1287         __le16  s_desc_size;            /* size of group descriptor */
1288 /*100*/ __le32  s_default_mount_opts;
1289         __le32  s_first_meta_bg;        /* First metablock block group */
1290         __le32  s_mkfs_time;            /* When the filesystem was created */
1291         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1292         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1293 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1294         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1295         __le32  s_free_blocks_count_hi; /* Free blocks count */
1296         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1297         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1298         __le32  s_flags;                /* Miscellaneous flags */
1299         __le16  s_raid_stride;          /* RAID stride */
1300         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1301         __le64  s_mmp_block;            /* Block for multi-mount protection */
1302         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1303         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1304         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1305         __u8    s_encryption_level;     /* versioning level for encryption */
1306         __u8    s_reserved_pad;         /* Padding to next 32bits */
1307         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1308         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1309         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1310         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1311                                               snapshot's future use */
1312         __le32  s_snapshot_list;        /* inode number of the head of the
1313                                            on-disk snapshot list */
1314 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1315         __le32  s_error_count;          /* number of fs errors */
1316         __le32  s_first_error_time;     /* first time an error happened */
1317         __le32  s_first_error_ino;      /* inode involved in first error */
1318         __le64  s_first_error_block;    /* block involved of first error */
1319         __u8    s_first_error_func[32]; /* function where the error happened */
1320         __le32  s_first_error_line;     /* line number where error happened */
1321         __le32  s_last_error_time;      /* most recent time of an error */
1322         __le32  s_last_error_ino;       /* inode involved in last error */
1323         __le32  s_last_error_line;      /* line number where error happened */
1324         __le64  s_last_error_block;     /* block involved of last error */
1325         __u8    s_last_error_func[32];  /* function where the error happened */
1326 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1327         __u8    s_mount_opts[64];
1328         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1329         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1330         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1331         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1332         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1333         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1334         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1335         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1336         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1337         __le32  s_reserved[98];         /* Padding to the end of the block */
1338         __le32  s_checksum;             /* crc32c(superblock) */
1339 };
1340
1341 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1342
1343 #ifdef __KERNEL__
1344
1345 /*
1346  * run-time mount flags
1347  */
1348 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1349 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1350 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1351
1352 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1353 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1354                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1355 #else
1356 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1357 #endif
1358
1359 /* Number of quota types we support */
1360 #define EXT4_MAXQUOTAS 3
1361
1362 /*
1363  * fourth extended-fs super-block data in memory
1364  */
1365 struct ext4_sb_info {
1366         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1367         unsigned long s_inodes_per_block;/* Number of inodes per block */
1368         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1369         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1370         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1371         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1372         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1373         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1374         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1375         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1376         unsigned long s_overhead;  /* # of fs overhead clusters */
1377         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1378         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1379         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1380         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1381         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1382         struct buffer_head **s_group_desc;
1383         unsigned int s_mount_opt;
1384         unsigned int s_mount_opt2;
1385         unsigned int s_mount_flags;
1386         unsigned int s_def_mount_opt;
1387         ext4_fsblk_t s_sb_block;
1388         atomic64_t s_resv_clusters;
1389         kuid_t s_resuid;
1390         kgid_t s_resgid;
1391         unsigned short s_mount_state;
1392         unsigned short s_pad;
1393         int s_addr_per_block_bits;
1394         int s_desc_per_block_bits;
1395         int s_inode_size;
1396         int s_first_ino;
1397         unsigned int s_inode_readahead_blks;
1398         unsigned int s_inode_goal;
1399         spinlock_t s_next_gen_lock;
1400         u32 s_next_generation;
1401         u32 s_hash_seed[4];
1402         int s_def_hash_version;
1403         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1404         struct percpu_counter s_freeclusters_counter;
1405         struct percpu_counter s_freeinodes_counter;
1406         struct percpu_counter s_dirs_counter;
1407         struct percpu_counter s_dirtyclusters_counter;
1408         struct blockgroup_lock *s_blockgroup_lock;
1409         struct proc_dir_entry *s_proc;
1410         struct kobject s_kobj;
1411         struct completion s_kobj_unregister;
1412         struct super_block *s_sb;
1413
1414         /* Journaling */
1415         struct journal_s *s_journal;
1416         struct list_head s_orphan;
1417         struct mutex s_orphan_lock;
1418         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1419         unsigned long s_commit_interval;
1420         u32 s_max_batch_time;
1421         u32 s_min_batch_time;
1422         struct block_device *journal_bdev;
1423 #ifdef CONFIG_QUOTA
1424         char *s_qf_names[EXT4_MAXQUOTAS];       /* Names of quota files with journalled quota */
1425         int s_jquota_fmt;                       /* Format of quota to use */
1426 #endif
1427         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1428         struct rb_root system_blks;
1429
1430 #ifdef EXTENTS_STATS
1431         /* ext4 extents stats */
1432         unsigned long s_ext_min;
1433         unsigned long s_ext_max;
1434         unsigned long s_depth_max;
1435         spinlock_t s_ext_stats_lock;
1436         unsigned long s_ext_blocks;
1437         unsigned long s_ext_extents;
1438 #endif
1439
1440         /* for buddy allocator */
1441         struct ext4_group_info ***s_group_info;
1442         struct inode *s_buddy_cache;
1443         spinlock_t s_md_lock;
1444         unsigned short *s_mb_offsets;
1445         unsigned int *s_mb_maxs;
1446         unsigned int s_group_info_size;
1447         unsigned int s_mb_free_pending;
1448         struct list_head s_freed_data_list;     /* List of blocks to be freed
1449                                                    after commit completed */
1450
1451         /* tunables */
1452         unsigned long s_stripe;
1453         unsigned int s_mb_stream_request;
1454         unsigned int s_mb_max_to_scan;
1455         unsigned int s_mb_min_to_scan;
1456         unsigned int s_mb_stats;
1457         unsigned int s_mb_order2_reqs;
1458         unsigned int s_mb_group_prealloc;
1459         unsigned int s_max_dir_size_kb;
1460         /* where last allocation was done - for stream allocation */
1461         unsigned long s_mb_last_group;
1462         unsigned long s_mb_last_start;
1463
1464         /* stats for buddy allocator */
1465         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1466         atomic_t s_bal_success; /* we found long enough chunks */
1467         atomic_t s_bal_allocated;       /* in blocks */
1468         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1469         atomic_t s_bal_goals;   /* goal hits */
1470         atomic_t s_bal_breaks;  /* too long searches */
1471         atomic_t s_bal_2orders; /* 2^order hits */
1472         spinlock_t s_bal_lock;
1473         unsigned long s_mb_buddies_generated;
1474         unsigned long long s_mb_generation_time;
1475         atomic_t s_mb_lost_chunks;
1476         atomic_t s_mb_preallocated;
1477         atomic_t s_mb_discarded;
1478         atomic_t s_lock_busy;
1479
1480         /* locality groups */
1481         struct ext4_locality_group __percpu *s_locality_groups;
1482
1483         /* for write statistics */
1484         unsigned long s_sectors_written_start;
1485         u64 s_kbytes_written;
1486
1487         /* the size of zero-out chunk */
1488         unsigned int s_extent_max_zeroout_kb;
1489
1490         unsigned int s_log_groups_per_flex;
1491         struct flex_groups *s_flex_groups;
1492         ext4_group_t s_flex_groups_allocated;
1493
1494         /* workqueue for reserved extent conversions (buffered io) */
1495         struct workqueue_struct *rsv_conversion_wq;
1496
1497         /* timer for periodic error stats printing */
1498         struct timer_list s_err_report;
1499
1500         /* Lazy inode table initialization info */
1501         struct ext4_li_request *s_li_request;
1502         /* Wait multiplier for lazy initialization thread */
1503         unsigned int s_li_wait_mult;
1504
1505         /* Kernel thread for multiple mount protection */
1506         struct task_struct *s_mmp_tsk;
1507
1508         /* record the last minlen when FITRIM is called. */
1509         atomic_t s_last_trim_minblks;
1510
1511         /* Reference to checksum algorithm driver via cryptoapi */
1512         struct crypto_shash *s_chksum_driver;
1513
1514         /* Precomputed FS UUID checksum for seeding other checksums */
1515         __u32 s_csum_seed;
1516
1517         /* Reclaim extents from extent status tree */
1518         struct shrinker s_es_shrinker;
1519         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1520         long s_es_nr_inode;
1521         struct ext4_es_stats s_es_stats;
1522         struct mb_cache *s_ea_block_cache;
1523         struct mb_cache *s_ea_inode_cache;
1524         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1525
1526         /* Ratelimit ext4 messages. */
1527         struct ratelimit_state s_err_ratelimit_state;
1528         struct ratelimit_state s_warning_ratelimit_state;
1529         struct ratelimit_state s_msg_ratelimit_state;
1530
1531         /* Barrier between changing inodes' journal flags and writepages ops. */
1532         struct percpu_rw_semaphore s_journal_flag_rwsem;
1533 };
1534
1535 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1536 {
1537         return sb->s_fs_info;
1538 }
1539 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1540 {
1541         return container_of(inode, struct ext4_inode_info, vfs_inode);
1542 }
1543
1544 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1545 {
1546         return ino == EXT4_ROOT_INO ||
1547                 ino == EXT4_USR_QUOTA_INO ||
1548                 ino == EXT4_GRP_QUOTA_INO ||
1549                 ino == EXT4_BOOT_LOADER_INO ||
1550                 ino == EXT4_JOURNAL_INO ||
1551                 ino == EXT4_RESIZE_INO ||
1552                 (ino >= EXT4_FIRST_INO(sb) &&
1553                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1554 }
1555
1556 /*
1557  * Inode dynamic state flags
1558  */
1559 enum {
1560         EXT4_STATE_JDATA,               /* journaled data exists */
1561         EXT4_STATE_NEW,                 /* inode is newly created */
1562         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1563         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1564         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1565         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1566         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1567         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1568         EXT4_STATE_DIOREAD_LOCK,        /* Disable support for dio read
1569                                            nolocking */
1570         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1571         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1572 };
1573
1574 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1575 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1576 {                                                                       \
1577         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1578 }                                                                       \
1579 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1580 {                                                                       \
1581         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1582 }                                                                       \
1583 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1584 {                                                                       \
1585         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1586 }
1587
1588 /* Add these declarations here only so that these functions can be
1589  * found by name.  Otherwise, they are very hard to locate. */
1590 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1591 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1592 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1593 EXT4_INODE_BIT_FNS(flag, flags, 0)
1594
1595 /* Add these declarations here only so that these functions can be
1596  * found by name.  Otherwise, they are very hard to locate. */
1597 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1598 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1599 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1600 #if (BITS_PER_LONG < 64)
1601 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1602
1603 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1604 {
1605         (ei)->i_state_flags = 0;
1606 }
1607 #else
1608 EXT4_INODE_BIT_FNS(state, flags, 32)
1609
1610 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1611 {
1612         /* We depend on the fact that callers will set i_flags */
1613 }
1614 #endif
1615 #else
1616 /* Assume that user mode programs are passing in an ext4fs superblock, not
1617  * a kernel struct super_block.  This will allow us to call the feature-test
1618  * macros from user land. */
1619 #define EXT4_SB(sb)     (sb)
1620 #endif
1621
1622 /*
1623  * Returns true if the inode is inode is encrypted
1624  */
1625 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1626
1627 /*
1628  * Codes for operating systems
1629  */
1630 #define EXT4_OS_LINUX           0
1631 #define EXT4_OS_HURD            1
1632 #define EXT4_OS_MASIX           2
1633 #define EXT4_OS_FREEBSD         3
1634 #define EXT4_OS_LITES           4
1635
1636 /*
1637  * Revision levels
1638  */
1639 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1640 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1641
1642 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1643 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1644
1645 #define EXT4_GOOD_OLD_INODE_SIZE 128
1646
1647 /*
1648  * Feature set definitions
1649  */
1650
1651 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1652 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1653 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1654 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1655 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1656 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1657 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1658
1659 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1660 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1661 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1662 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1663 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1664 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1665 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1666 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1667 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1668 /*
1669  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1670  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1671  * all other data structures' checksums.  However, the METADATA_CSUM and
1672  * GDT_CSUM bits are mutually exclusive.
1673  */
1674 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1675 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1676 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1677
1678 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1679 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1680 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1681 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1682 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1683 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1684 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1685 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1686 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1687 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1688 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1689 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1690 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1691 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1692 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1693
1694 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1695 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1696 { \
1697         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1698                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1699 } \
1700 static inline void ext4_set_feature_##name(struct super_block *sb) \
1701 { \
1702         EXT4_SB(sb)->s_es->s_feature_compat |= \
1703                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1704 } \
1705 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1706 { \
1707         EXT4_SB(sb)->s_es->s_feature_compat &= \
1708                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1709 }
1710
1711 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1712 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1713 { \
1714         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1715                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1716 } \
1717 static inline void ext4_set_feature_##name(struct super_block *sb) \
1718 { \
1719         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1720                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1721 } \
1722 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1723 { \
1724         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1725                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1726 }
1727
1728 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1729 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1730 { \
1731         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1732                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1733 } \
1734 static inline void ext4_set_feature_##name(struct super_block *sb) \
1735 { \
1736         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1737                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1738 } \
1739 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1740 { \
1741         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1742                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1743 }
1744
1745 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1746 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1747 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1748 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1749 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1750 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1751 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1752
1753 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1754 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1755 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1756 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1757 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1758 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1759 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1760 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1761 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1762 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1763 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1764 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1765
1766 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1767 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1768 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1769 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1770 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1771 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1772 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1773 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1774 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1775 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1776 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1777 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1778 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1779 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1780 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1781
1782 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1783 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1784                                          EXT4_FEATURE_INCOMPAT_META_BG)
1785 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1786                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1787                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1788
1789 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1790 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1791                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1792                                          EXT4_FEATURE_INCOMPAT_META_BG)
1793 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1794                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1795                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1796
1797 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1798 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1799                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1800                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1801                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1802                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1803                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1804                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1805                                          EXT4_FEATURE_INCOMPAT_MMP | \
1806                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1807                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1808                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1809                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1810 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1811                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1812                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1813                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1814                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1815                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1816                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1817                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1818                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1819                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1820                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1821
1822 #define EXTN_FEATURE_FUNCS(ver) \
1823 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1824 { \
1825         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1826                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1827 } \
1828 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1829 { \
1830         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1831                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1832 } \
1833 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1834 { \
1835         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1836                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1837 }
1838
1839 EXTN_FEATURE_FUNCS(2)
1840 EXTN_FEATURE_FUNCS(3)
1841 EXTN_FEATURE_FUNCS(4)
1842
1843 static inline bool ext4_has_compat_features(struct super_block *sb)
1844 {
1845         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1846 }
1847 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1848 {
1849         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1850 }
1851 static inline bool ext4_has_incompat_features(struct super_block *sb)
1852 {
1853         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1854 }
1855
1856 /*
1857  * Superblock flags
1858  */
1859 #define EXT4_FLAGS_RESIZING     0
1860 #define EXT4_FLAGS_SHUTDOWN     1
1861
1862 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1863 {
1864         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1865 }
1866
1867
1868 /*
1869  * Default values for user and/or group using reserved blocks
1870  */
1871 #define EXT4_DEF_RESUID         0
1872 #define EXT4_DEF_RESGID         0
1873
1874 /*
1875  * Default project ID
1876  */
1877 #define EXT4_DEF_PROJID         0
1878
1879 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1880
1881 /*
1882  * Default mount options
1883  */
1884 #define EXT4_DEFM_DEBUG         0x0001
1885 #define EXT4_DEFM_BSDGROUPS     0x0002
1886 #define EXT4_DEFM_XATTR_USER    0x0004
1887 #define EXT4_DEFM_ACL           0x0008
1888 #define EXT4_DEFM_UID16         0x0010
1889 #define EXT4_DEFM_JMODE         0x0060
1890 #define EXT4_DEFM_JMODE_DATA    0x0020
1891 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1892 #define EXT4_DEFM_JMODE_WBACK   0x0060
1893 #define EXT4_DEFM_NOBARRIER     0x0100
1894 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1895 #define EXT4_DEFM_DISCARD       0x0400
1896 #define EXT4_DEFM_NODELALLOC    0x0800
1897
1898 /*
1899  * Default journal batch times
1900  */
1901 #define EXT4_DEF_MIN_BATCH_TIME 0
1902 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1903
1904 /*
1905  * Minimum number of groups in a flexgroup before we separate out
1906  * directories into the first block group of a flexgroup
1907  */
1908 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1909
1910 /*
1911  * Structure of a directory entry
1912  */
1913 #define EXT4_NAME_LEN 255
1914
1915 struct ext4_dir_entry {
1916         __le32  inode;                  /* Inode number */
1917         __le16  rec_len;                /* Directory entry length */
1918         __le16  name_len;               /* Name length */
1919         char    name[EXT4_NAME_LEN];    /* File name */
1920 };
1921
1922 /*
1923  * The new version of the directory entry.  Since EXT4 structures are
1924  * stored in intel byte order, and the name_len field could never be
1925  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1926  * file_type field.
1927  */
1928 struct ext4_dir_entry_2 {
1929         __le32  inode;                  /* Inode number */
1930         __le16  rec_len;                /* Directory entry length */
1931         __u8    name_len;               /* Name length */
1932         __u8    file_type;
1933         char    name[EXT4_NAME_LEN];    /* File name */
1934 };
1935
1936 /*
1937  * This is a bogus directory entry at the end of each leaf block that
1938  * records checksums.
1939  */
1940 struct ext4_dir_entry_tail {
1941         __le32  det_reserved_zero1;     /* Pretend to be unused */
1942         __le16  det_rec_len;            /* 12 */
1943         __u8    det_reserved_zero2;     /* Zero name length */
1944         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1945         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1946 };
1947
1948 #define EXT4_DIRENT_TAIL(block, blocksize) \
1949         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1950                                         ((blocksize) - \
1951                                          sizeof(struct ext4_dir_entry_tail))))
1952
1953 /*
1954  * Ext4 directory file types.  Only the low 3 bits are used.  The
1955  * other bits are reserved for now.
1956  */
1957 #define EXT4_FT_UNKNOWN         0
1958 #define EXT4_FT_REG_FILE        1
1959 #define EXT4_FT_DIR             2
1960 #define EXT4_FT_CHRDEV          3
1961 #define EXT4_FT_BLKDEV          4
1962 #define EXT4_FT_FIFO            5
1963 #define EXT4_FT_SOCK            6
1964 #define EXT4_FT_SYMLINK         7
1965
1966 #define EXT4_FT_MAX             8
1967
1968 #define EXT4_FT_DIR_CSUM        0xDE
1969
1970 /*
1971  * EXT4_DIR_PAD defines the directory entries boundaries
1972  *
1973  * NOTE: It must be a multiple of 4
1974  */
1975 #define EXT4_DIR_PAD                    4
1976 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1977 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1978                                          ~EXT4_DIR_ROUND)
1979 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1980
1981 /*
1982  * If we ever get support for fs block sizes > page_size, we'll need
1983  * to remove the #if statements in the next two functions...
1984  */
1985 static inline unsigned int
1986 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1987 {
1988         unsigned len = le16_to_cpu(dlen);
1989
1990 #if (PAGE_SIZE >= 65536)
1991         if (len == EXT4_MAX_REC_LEN || len == 0)
1992                 return blocksize;
1993         return (len & 65532) | ((len & 3) << 16);
1994 #else
1995         return len;
1996 #endif
1997 }
1998
1999 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2000 {
2001         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2002                 BUG();
2003 #if (PAGE_SIZE >= 65536)
2004         if (len < 65536)
2005                 return cpu_to_le16(len);
2006         if (len == blocksize) {
2007                 if (blocksize == 65536)
2008                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2009                 else
2010                         return cpu_to_le16(0);
2011         }
2012         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2013 #else
2014         return cpu_to_le16(len);
2015 #endif
2016 }
2017
2018 /*
2019  * Hash Tree Directory indexing
2020  * (c) Daniel Phillips, 2001
2021  */
2022
2023 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2024                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2025 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2026 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2027
2028 /* Legal values for the dx_root hash_version field: */
2029
2030 #define DX_HASH_LEGACY          0
2031 #define DX_HASH_HALF_MD4        1
2032 #define DX_HASH_TEA             2
2033 #define DX_HASH_LEGACY_UNSIGNED 3
2034 #define DX_HASH_HALF_MD4_UNSIGNED       4
2035 #define DX_HASH_TEA_UNSIGNED            5
2036
2037 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2038                               const void *address, unsigned int length)
2039 {
2040         struct {
2041                 struct shash_desc shash;
2042                 char ctx[4];
2043         } desc;
2044         int err;
2045
2046         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2047
2048         desc.shash.tfm = sbi->s_chksum_driver;
2049         desc.shash.flags = 0;
2050         *(u32 *)desc.ctx = crc;
2051
2052         err = crypto_shash_update(&desc.shash, address, length);
2053         BUG_ON(err);
2054
2055         return *(u32 *)desc.ctx;
2056 }
2057
2058 #ifdef __KERNEL__
2059
2060 /* hash info structure used by the directory hash */
2061 struct dx_hash_info
2062 {
2063         u32             hash;
2064         u32             minor_hash;
2065         int             hash_version;
2066         u32             *seed;
2067 };
2068
2069
2070 /* 32 and 64 bit signed EOF for dx directories */
2071 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2072 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2073
2074
2075 /*
2076  * Control parameters used by ext4_htree_next_block
2077  */
2078 #define HASH_NB_ALWAYS          1
2079
2080 struct ext4_filename {
2081         const struct qstr *usr_fname;
2082         struct fscrypt_str disk_name;
2083         struct dx_hash_info hinfo;
2084 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2085         struct fscrypt_str crypto_buf;
2086 #endif
2087 };
2088
2089 #define fname_name(p) ((p)->disk_name.name)
2090 #define fname_len(p)  ((p)->disk_name.len)
2091
2092 /*
2093  * Describe an inode's exact location on disk and in memory
2094  */
2095 struct ext4_iloc
2096 {
2097         struct buffer_head *bh;
2098         unsigned long offset;
2099         ext4_group_t block_group;
2100 };
2101
2102 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2103 {
2104         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2105 }
2106
2107 static inline bool ext4_is_quota_file(struct inode *inode)
2108 {
2109         return IS_NOQUOTA(inode) &&
2110                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2111 }
2112
2113 /*
2114  * This structure is stuffed into the struct file's private_data field
2115  * for directories.  It is where we put information so that we can do
2116  * readdir operations in hash tree order.
2117  */
2118 struct dir_private_info {
2119         struct rb_root  root;
2120         struct rb_node  *curr_node;
2121         struct fname    *extra_fname;
2122         loff_t          last_pos;
2123         __u32           curr_hash;
2124         __u32           curr_minor_hash;
2125         __u32           next_hash;
2126 };
2127
2128 /* calculate the first block number of the group */
2129 static inline ext4_fsblk_t
2130 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2131 {
2132         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2133                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2134 }
2135
2136 /*
2137  * Special error return code only used by dx_probe() and its callers.
2138  */
2139 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2140
2141 /* htree levels for ext4 */
2142 #define EXT4_HTREE_LEVEL_COMPAT 2
2143 #define EXT4_HTREE_LEVEL        3
2144
2145 static inline int ext4_dir_htree_level(struct super_block *sb)
2146 {
2147         return ext4_has_feature_largedir(sb) ?
2148                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2149 }
2150
2151 /*
2152  * Timeout and state flag for lazy initialization inode thread.
2153  */
2154 #define EXT4_DEF_LI_WAIT_MULT                   10
2155 #define EXT4_DEF_LI_MAX_START_DELAY             5
2156 #define EXT4_LAZYINIT_QUIT                      0x0001
2157 #define EXT4_LAZYINIT_RUNNING                   0x0002
2158
2159 /*
2160  * Lazy inode table initialization info
2161  */
2162 struct ext4_lazy_init {
2163         unsigned long           li_state;
2164         struct list_head        li_request_list;
2165         struct mutex            li_list_mtx;
2166 };
2167
2168 struct ext4_li_request {
2169         struct super_block      *lr_super;
2170         struct ext4_sb_info     *lr_sbi;
2171         ext4_group_t            lr_next_group;
2172         struct list_head        lr_request;
2173         unsigned long           lr_next_sched;
2174         unsigned long           lr_timeout;
2175 };
2176
2177 struct ext4_features {
2178         struct kobject f_kobj;
2179         struct completion f_kobj_unregister;
2180 };
2181
2182 /*
2183  * This structure will be used for multiple mount protection. It will be
2184  * written into the block number saved in the s_mmp_block field in the
2185  * superblock. Programs that check MMP should assume that if
2186  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2187  * to use the filesystem, regardless of how old the timestamp is.
2188  */
2189 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2190 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2191 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2192 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2193
2194 struct mmp_struct {
2195         __le32  mmp_magic;              /* Magic number for MMP */
2196         __le32  mmp_seq;                /* Sequence no. updated periodically */
2197
2198         /*
2199          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2200          * purposes and do not affect the correctness of the algorithm
2201          */
2202         __le64  mmp_time;               /* Time last updated */
2203         char    mmp_nodename[64];       /* Node which last updated MMP block */
2204         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2205
2206         /*
2207          * mmp_check_interval is used to verify if the MMP block has been
2208          * updated on the block device. The value is updated based on the
2209          * maximum time to write the MMP block during an update cycle.
2210          */
2211         __le16  mmp_check_interval;
2212
2213         __le16  mmp_pad1;
2214         __le32  mmp_pad2[226];
2215         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2216 };
2217
2218 /* arguments passed to the mmp thread */
2219 struct mmpd_data {
2220         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2221         struct super_block *sb;  /* super block of the fs */
2222 };
2223
2224 /*
2225  * Check interval multiplier
2226  * The MMP block is written every update interval and initially checked every
2227  * update interval x the multiplier (the value is then adapted based on the
2228  * write latency). The reason is that writes can be delayed under load and we
2229  * don't want readers to incorrectly assume that the filesystem is no longer
2230  * in use.
2231  */
2232 #define EXT4_MMP_CHECK_MULT             2UL
2233
2234 /*
2235  * Minimum interval for MMP checking in seconds.
2236  */
2237 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2238
2239 /*
2240  * Maximum interval for MMP checking in seconds.
2241  */
2242 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2243
2244 /*
2245  * Function prototypes
2246  */
2247
2248 /*
2249  * Ok, these declarations are also in <linux/kernel.h> but none of the
2250  * ext4 source programs needs to include it so they are duplicated here.
2251  */
2252 # define NORET_TYPE     /**/
2253 # define ATTRIB_NORET   __attribute__((noreturn))
2254 # define NORET_AND      noreturn,
2255
2256 /* bitmap.c */
2257 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2258 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2259                                 struct ext4_group_desc *gdp,
2260                                 struct buffer_head *bh, int sz);
2261 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2262                                   struct ext4_group_desc *gdp,
2263                                   struct buffer_head *bh, int sz);
2264 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2265                                 struct ext4_group_desc *gdp,
2266                                 struct buffer_head *bh);
2267 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2268                                   struct ext4_group_desc *gdp,
2269                                   struct buffer_head *bh);
2270
2271 /* balloc.c */
2272 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2273                                          ext4_fsblk_t blocknr,
2274                                          ext4_group_t *blockgrpp,
2275                                          ext4_grpblk_t *offsetp);
2276 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2277                                           ext4_fsblk_t block);
2278
2279 extern unsigned int ext4_block_group(struct super_block *sb,
2280                         ext4_fsblk_t blocknr);
2281 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2282                         ext4_fsblk_t blocknr);
2283 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2284 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2285                         ext4_group_t group);
2286 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2287                                          ext4_fsblk_t goal,
2288                                          unsigned int flags,
2289                                          unsigned long *count,
2290                                          int *errp);
2291 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2292                                     s64 nclusters, unsigned int flags);
2293 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2294 extern void ext4_check_blocks_bitmap(struct super_block *);
2295 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2296                                                     ext4_group_t block_group,
2297                                                     struct buffer_head ** bh);
2298 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2299
2300 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2301                                                 ext4_group_t block_group);
2302 extern int ext4_wait_block_bitmap(struct super_block *sb,
2303                                   ext4_group_t block_group,
2304                                   struct buffer_head *bh);
2305 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2306                                                   ext4_group_t block_group);
2307 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2308                                               ext4_group_t block_group,
2309                                               struct ext4_group_desc *gdp);
2310 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2311
2312 static inline bool ext4_encrypted_inode(struct inode *inode)
2313 {
2314         return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
2315 }
2316
2317 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2318 static inline int ext4_fname_setup_filename(struct inode *dir,
2319                         const struct qstr *iname,
2320                         int lookup, struct ext4_filename *fname)
2321 {
2322         struct fscrypt_name name;
2323         int err;
2324
2325         memset(fname, 0, sizeof(struct ext4_filename));
2326
2327         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2328
2329         fname->usr_fname = name.usr_fname;
2330         fname->disk_name = name.disk_name;
2331         fname->hinfo.hash = name.hash;
2332         fname->hinfo.minor_hash = name.minor_hash;
2333         fname->crypto_buf = name.crypto_buf;
2334         return err;
2335 }
2336
2337 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2338 {
2339         struct fscrypt_name name;
2340
2341         name.crypto_buf = fname->crypto_buf;
2342         fscrypt_free_filename(&name);
2343
2344         fname->crypto_buf.name = NULL;
2345         fname->usr_fname = NULL;
2346         fname->disk_name.name = NULL;
2347 }
2348 #else
2349 static inline int ext4_fname_setup_filename(struct inode *dir,
2350                 const struct qstr *iname,
2351                 int lookup, struct ext4_filename *fname)
2352 {
2353         fname->usr_fname = iname;
2354         fname->disk_name.name = (unsigned char *) iname->name;
2355         fname->disk_name.len = iname->len;
2356         return 0;
2357 }
2358 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2359
2360 #endif
2361
2362 /* dir.c */
2363 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2364                                   struct file *,
2365                                   struct ext4_dir_entry_2 *,
2366                                   struct buffer_head *, char *, int,
2367                                   unsigned int);
2368 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2369         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2370                                         (de), (bh), (buf), (size), (offset)))
2371 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2372                                 __u32 minor_hash,
2373                                 struct ext4_dir_entry_2 *dirent,
2374                                 struct fscrypt_str *ent_name);
2375 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2376 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2377                              struct buffer_head *bh,
2378                              void *buf, int buf_size,
2379                              struct ext4_filename *fname,
2380                              struct ext4_dir_entry_2 **dest_de);
2381 void ext4_insert_dentry(struct inode *inode,
2382                         struct ext4_dir_entry_2 *de,
2383                         int buf_size,
2384                         struct ext4_filename *fname);
2385 static inline void ext4_update_dx_flag(struct inode *inode)
2386 {
2387         if (!ext4_has_feature_dir_index(inode->i_sb))
2388                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2389 }
2390 static const unsigned char ext4_filetype_table[] = {
2391         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2392 };
2393
2394 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2395 {
2396         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2397                 return DT_UNKNOWN;
2398
2399         return ext4_filetype_table[filetype];
2400 }
2401 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2402                              void *buf, int buf_size);
2403
2404 /* fsync.c */
2405 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2406
2407 /* hash.c */
2408 extern int ext4fs_dirhash(const char *name, int len, struct
2409                           dx_hash_info *hinfo);
2410
2411 /* ialloc.c */
2412 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2413                                       const struct qstr *qstr, __u32 goal,
2414                                       uid_t *owner, __u32 i_flags,
2415                                       int handle_type, unsigned int line_no,
2416                                       int nblocks);
2417
2418 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2419         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2420                          i_flags, 0, 0, 0)
2421 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2422                                     type, nblocks)                  \
2423         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2424                          0, (type), __LINE__, (nblocks))
2425
2426
2427 extern void ext4_free_inode(handle_t *, struct inode *);
2428 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2429 extern unsigned long ext4_count_free_inodes(struct super_block *);
2430 extern unsigned long ext4_count_dirs(struct super_block *);
2431 extern void ext4_check_inodes_bitmap(struct super_block *);
2432 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2433 extern int ext4_init_inode_table(struct super_block *sb,
2434                                  ext4_group_t group, int barrier);
2435 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2436
2437 /* mballoc.c */
2438 extern const struct file_operations ext4_seq_mb_groups_fops;
2439 extern long ext4_mb_stats;
2440 extern long ext4_mb_max_to_scan;
2441 extern int ext4_mb_init(struct super_block *);
2442 extern int ext4_mb_release(struct super_block *);
2443 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2444                                 struct ext4_allocation_request *, int *);
2445 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2446 extern void ext4_discard_preallocations(struct inode *);
2447 extern int __init ext4_init_mballoc(void);
2448 extern void ext4_exit_mballoc(void);
2449 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2450                              struct buffer_head *bh, ext4_fsblk_t block,
2451                              unsigned long count, int flags);
2452 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2453                                    ext4_group_t ngroups);
2454 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2455                 ext4_group_t i, struct ext4_group_desc *desc);
2456 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2457                                 ext4_fsblk_t block, unsigned long count);
2458 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2459 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2460
2461 /* inode.c */
2462 int ext4_inode_is_fast_symlink(struct inode *inode);
2463 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2464 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2465 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2466                              struct buffer_head *bh_result, int create);
2467 int ext4_get_block(struct inode *inode, sector_t iblock,
2468                    struct buffer_head *bh_result, int create);
2469 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2470                        struct buffer_head *bh_result, int create);
2471 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2472                            struct buffer_head *bh, int create);
2473 int ext4_walk_page_buffers(handle_t *handle,
2474                            struct buffer_head *head,
2475                            unsigned from,
2476                            unsigned to,
2477                            int *partial,
2478                            int (*fn)(handle_t *handle,
2479                                      struct buffer_head *bh));
2480 int do_journal_get_write_access(handle_t *handle,
2481                                 struct buffer_head *bh);
2482 #define FALL_BACK_TO_NONDELALLOC 1
2483 #define CONVERT_INLINE_DATA      2
2484
2485 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2486 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2487 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2488 extern int  ext4_setattr(struct dentry *, struct iattr *);
2489 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2490 extern void ext4_evict_inode(struct inode *);
2491 extern void ext4_clear_inode(struct inode *);
2492 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2493 extern int  ext4_sync_inode(handle_t *, struct inode *);
2494 extern void ext4_dirty_inode(struct inode *, int);
2495 extern int ext4_change_inode_journal_flag(struct inode *, int);
2496 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2497 extern int ext4_inode_attach_jinode(struct inode *inode);
2498 extern int ext4_can_truncate(struct inode *inode);
2499 extern int ext4_truncate(struct inode *);
2500 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2501 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2502 extern void ext4_set_inode_flags(struct inode *);
2503 extern int ext4_alloc_da_blocks(struct inode *inode);
2504 extern void ext4_set_aops(struct inode *inode);
2505 extern int ext4_writepage_trans_blocks(struct inode *);
2506 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2507 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2508                              loff_t lstart, loff_t lend);
2509 extern int ext4_page_mkwrite(struct vm_fault *vmf);
2510 extern int ext4_filemap_fault(struct vm_fault *vmf);
2511 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2512 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2513 extern void ext4_da_update_reserve_space(struct inode *inode,
2514                                         int used, int quota_claim);
2515 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2516                               ext4_fsblk_t pblk, ext4_lblk_t len);
2517 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
2518                                 unsigned int map_len,
2519                                 struct extent_status *result);
2520
2521 /* indirect.c */
2522 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2523                                 struct ext4_map_blocks *map, int flags);
2524 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2525 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2526 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2527 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2528                                  ext4_lblk_t start, ext4_lblk_t end);
2529
2530 /* ioctl.c */
2531 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2532 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2533
2534 /* migrate.c */
2535 extern int ext4_ext_migrate(struct inode *);
2536 extern int ext4_ind_migrate(struct inode *inode);
2537
2538 /* namei.c */
2539 extern int ext4_dirent_csum_verify(struct inode *inode,
2540                                    struct ext4_dir_entry *dirent);
2541 extern int ext4_orphan_add(handle_t *, struct inode *);
2542 extern int ext4_orphan_del(handle_t *, struct inode *);
2543 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2544                                 __u32 start_minor_hash, __u32 *next_hash);
2545 extern int ext4_search_dir(struct buffer_head *bh,
2546                            char *search_buf,
2547                            int buf_size,
2548                            struct inode *dir,
2549                            struct ext4_filename *fname,
2550                            unsigned int offset,
2551                            struct ext4_dir_entry_2 **res_dir);
2552 extern int ext4_generic_delete_entry(handle_t *handle,
2553                                      struct inode *dir,
2554                                      struct ext4_dir_entry_2 *de_del,
2555                                      struct buffer_head *bh,
2556                                      void *entry_buf,
2557                                      int buf_size,
2558                                      int csum_size);
2559 extern bool ext4_empty_dir(struct inode *inode);
2560
2561 /* resize.c */
2562 extern int ext4_group_add(struct super_block *sb,
2563                                 struct ext4_new_group_data *input);
2564 extern int ext4_group_extend(struct super_block *sb,
2565                                 struct ext4_super_block *es,
2566                                 ext4_fsblk_t n_blocks_count);
2567 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2568
2569 /* super.c */
2570 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2571 extern int ext4_calculate_overhead(struct super_block *sb);
2572 extern void ext4_superblock_csum_set(struct super_block *sb);
2573 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2574 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2575 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2576                                     ext4_group_t ngroup);
2577 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2578                                      char nbuf[16]);
2579
2580 extern __printf(4, 5)
2581 void __ext4_error(struct super_block *, const char *, unsigned int,
2582                   const char *, ...);
2583 extern __printf(5, 6)
2584 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2585                       const char *, ...);
2586 extern __printf(5, 6)
2587 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2588                      const char *, ...);
2589 extern void __ext4_std_error(struct super_block *, const char *,
2590                              unsigned int, int);
2591 extern __printf(4, 5)
2592 void __ext4_abort(struct super_block *, const char *, unsigned int,
2593                   const char *, ...);
2594 extern __printf(4, 5)
2595 void __ext4_warning(struct super_block *, const char *, unsigned int,
2596                     const char *, ...);
2597 extern __printf(4, 5)
2598 void __ext4_warning_inode(const struct inode *inode, const char *function,
2599                           unsigned int line, const char *fmt, ...);
2600 extern __printf(3, 4)
2601 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2602 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2603                            const char *, unsigned int, const char *);
2604 extern __printf(7, 8)
2605 void __ext4_grp_locked_error(const char *, unsigned int,
2606                              struct super_block *, ext4_group_t,
2607                              unsigned long, ext4_fsblk_t,
2608                              const char *, ...);
2609
2610 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2611         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2612
2613 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2614         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2615
2616 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2617         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2618
2619 #ifdef CONFIG_PRINTK
2620
2621 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2622         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2623 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2624         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2625 #define ext4_error(sb, fmt, ...)                                        \
2626         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2627 #define ext4_abort(sb, fmt, ...)                                        \
2628         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2629 #define ext4_warning(sb, fmt, ...)                                      \
2630         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2631 #define ext4_warning_inode(inode, fmt, ...)                             \
2632         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2633 #define ext4_msg(sb, level, fmt, ...)                           \
2634         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2635 #define dump_mmp_msg(sb, mmp, msg)                                      \
2636         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2637 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2638         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2639                                 fmt, ##__VA_ARGS__)
2640
2641 #else
2642
2643 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2644 do {                                                                    \
2645         no_printk(fmt, ##__VA_ARGS__);                                  \
2646         __ext4_error_inode(inode, "", 0, block, " ");                   \
2647 } while (0)
2648 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2649 do {                                                                    \
2650         no_printk(fmt, ##__VA_ARGS__);                                  \
2651         __ext4_error_file(file, "", 0, block, " ");                     \
2652 } while (0)
2653 #define ext4_error(sb, fmt, ...)                                        \
2654 do {                                                                    \
2655         no_printk(fmt, ##__VA_ARGS__);                                  \
2656         __ext4_error(sb, "", 0, " ");                                   \
2657 } while (0)
2658 #define ext4_abort(sb, fmt, ...)                                        \
2659 do {                                                                    \
2660         no_printk(fmt, ##__VA_ARGS__);                                  \
2661         __ext4_abort(sb, "", 0, " ");                                   \
2662 } while (0)
2663 #define ext4_warning(sb, fmt, ...)                                      \
2664 do {                                                                    \
2665         no_printk(fmt, ##__VA_ARGS__);                                  \
2666         __ext4_warning(sb, "", 0, " ");                                 \
2667 } while (0)
2668 #define ext4_warning_inode(inode, fmt, ...)                             \
2669 do {                                                                    \
2670         no_printk(fmt, ##__VA_ARGS__);                                  \
2671         __ext4_warning_inode(inode, "", 0, " ");                        \
2672 } while (0)
2673 #define ext4_msg(sb, level, fmt, ...)                                   \
2674 do {                                                                    \
2675         no_printk(fmt, ##__VA_ARGS__);                                  \
2676         __ext4_msg(sb, "", " ");                                        \
2677 } while (0)
2678 #define dump_mmp_msg(sb, mmp, msg)                                      \
2679         __dump_mmp_msg(sb, mmp, "", 0, "")
2680 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2681 do {                                                                    \
2682         no_printk(fmt, ##__VA_ARGS__);                          \
2683         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2684 } while (0)
2685
2686 #endif
2687
2688 extern void ext4_update_dynamic_rev(struct super_block *sb);
2689 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2690                                         __u32 compat);
2691 extern int ext4_update_rocompat_feature(handle_t *handle,
2692                                         struct super_block *sb, __u32 rocompat);
2693 extern int ext4_update_incompat_feature(handle_t *handle,
2694                                         struct super_block *sb, __u32 incompat);
2695 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2696                                       struct ext4_group_desc *bg);
2697 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2698                                       struct ext4_group_desc *bg);
2699 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2700                                      struct ext4_group_desc *bg);
2701 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2702                                       struct ext4_group_desc *bg);
2703 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2704                                  struct ext4_group_desc *bg);
2705 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2706                                 struct ext4_group_desc *bg);
2707 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2708                                    struct ext4_group_desc *bg);
2709 extern void ext4_block_bitmap_set(struct super_block *sb,
2710                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2711 extern void ext4_inode_bitmap_set(struct super_block *sb,
2712                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2713 extern void ext4_inode_table_set(struct super_block *sb,
2714                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2715 extern void ext4_free_group_clusters_set(struct super_block *sb,
2716                                          struct ext4_group_desc *bg,
2717                                          __u32 count);
2718 extern void ext4_free_inodes_set(struct super_block *sb,
2719                                 struct ext4_group_desc *bg, __u32 count);
2720 extern void ext4_used_dirs_set(struct super_block *sb,
2721                                 struct ext4_group_desc *bg, __u32 count);
2722 extern void ext4_itable_unused_set(struct super_block *sb,
2723                                    struct ext4_group_desc *bg, __u32 count);
2724 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2725                                        struct ext4_group_desc *gdp);
2726 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2727                                      struct ext4_group_desc *gdp);
2728 extern int ext4_register_li_request(struct super_block *sb,
2729                                     ext4_group_t first_not_zeroed);
2730
2731 static inline int ext4_has_metadata_csum(struct super_block *sb)
2732 {
2733         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2734                      !EXT4_SB(sb)->s_chksum_driver);
2735
2736         return ext4_has_feature_metadata_csum(sb) &&
2737                (EXT4_SB(sb)->s_chksum_driver != NULL);
2738 }
2739
2740 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2741 {
2742         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2743 }
2744
2745 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2746 {
2747         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2748                 le32_to_cpu(es->s_blocks_count_lo);
2749 }
2750
2751 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2752 {
2753         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2754                 le32_to_cpu(es->s_r_blocks_count_lo);
2755 }
2756
2757 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2758 {
2759         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2760                 le32_to_cpu(es->s_free_blocks_count_lo);
2761 }
2762
2763 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2764                                          ext4_fsblk_t blk)
2765 {
2766         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2767         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2768 }
2769
2770 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2771                                               ext4_fsblk_t blk)
2772 {
2773         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2774         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2775 }
2776
2777 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2778                                            ext4_fsblk_t blk)
2779 {
2780         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2781         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2782 }
2783
2784 static inline loff_t ext4_isize(struct super_block *sb,
2785                                 struct ext4_inode *raw_inode)
2786 {
2787         if (ext4_has_feature_largedir(sb) ||
2788             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2789                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2790                         le32_to_cpu(raw_inode->i_size_lo);
2791
2792         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2793 }
2794
2795 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2796 {
2797         raw_inode->i_size_lo = cpu_to_le32(i_size);
2798         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2799 }
2800
2801 static inline
2802 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2803                                             ext4_group_t group)
2804 {
2805          struct ext4_group_info ***grp_info;
2806          long indexv, indexh;
2807          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2808          grp_info = EXT4_SB(sb)->s_group_info;
2809          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2810          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2811          return grp_info[indexv][indexh];
2812 }
2813
2814 /*
2815  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2816  * the locking protocol documented in the comments of ext4_group_add()
2817  * in resize.c
2818  */
2819 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2820 {
2821         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2822
2823         smp_rmb();
2824         return ngroups;
2825 }
2826
2827 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2828                                              ext4_group_t block_group)
2829 {
2830         return block_group >> sbi->s_log_groups_per_flex;
2831 }
2832
2833 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2834 {
2835         return 1 << sbi->s_log_groups_per_flex;
2836 }
2837
2838 #define ext4_std_error(sb, errno)                               \
2839 do {                                                            \
2840         if ((errno))                                            \
2841                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2842 } while (0)
2843
2844 #ifdef CONFIG_SMP
2845 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2846  * counters. So we need to make sure we have free clusters more
2847  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2848  */
2849 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2850 #else
2851 #define EXT4_FREECLUSTERS_WATERMARK 0
2852 #endif
2853
2854 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2855 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2856 {
2857         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2858                      !inode_is_locked(inode));
2859         down_write(&EXT4_I(inode)->i_data_sem);
2860         if (newsize > EXT4_I(inode)->i_disksize)
2861                 EXT4_I(inode)->i_disksize = newsize;
2862         up_write(&EXT4_I(inode)->i_data_sem);
2863 }
2864
2865 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2866 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2867 {
2868         int changed = 0;
2869
2870         if (newsize > inode->i_size) {
2871                 i_size_write(inode, newsize);
2872                 changed = 1;
2873         }
2874         if (newsize > EXT4_I(inode)->i_disksize) {
2875                 ext4_update_i_disksize(inode, newsize);
2876                 changed |= 2;
2877         }
2878         return changed;
2879 }
2880
2881 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2882                                       loff_t len);
2883
2884 struct ext4_group_info {
2885         unsigned long   bb_state;
2886         struct rb_root  bb_free_root;
2887         ext4_grpblk_t   bb_first_free;  /* first free block */
2888         ext4_grpblk_t   bb_free;        /* total free blocks */
2889         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2890         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2891         struct          list_head bb_prealloc_list;
2892 #ifdef DOUBLE_CHECK
2893         void            *bb_bitmap;
2894 #endif
2895         struct rw_semaphore alloc_sem;
2896         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2897                                          * regions, index is order.
2898                                          * bb_counters[3] = 5 means
2899                                          * 5 free 8-block regions. */
2900 };
2901
2902 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2903 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2904 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2905 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2906
2907 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2908         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2909 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2910         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2911 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2912         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2913
2914 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2915         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2916 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2917         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2918 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2919         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2920
2921 #define EXT4_MAX_CONTENTION             8
2922 #define EXT4_CONTENTION_THRESHOLD       2
2923
2924 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2925                                               ext4_group_t group)
2926 {
2927         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2928 }
2929
2930 /*
2931  * Returns true if the filesystem is busy enough that attempts to
2932  * access the block group locks has run into contention.
2933  */
2934 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2935 {
2936         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2937 }
2938
2939 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2940 {
2941         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2942         if (spin_trylock(lock))
2943                 /*
2944                  * We're able to grab the lock right away, so drop the
2945                  * lock contention counter.
2946                  */
2947                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2948         else {
2949                 /*
2950                  * The lock is busy, so bump the contention counter,
2951                  * and then wait on the spin lock.
2952                  */
2953                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2954                                   EXT4_MAX_CONTENTION);
2955                 spin_lock(lock);
2956         }
2957 }
2958
2959 static inline void ext4_unlock_group(struct super_block *sb,
2960                                         ext4_group_t group)
2961 {
2962         spin_unlock(ext4_group_lock_ptr(sb, group));
2963 }
2964
2965 /*
2966  * Block validity checking
2967  */
2968 #define ext4_check_indirect_blockref(inode, bh)                         \
2969         ext4_check_blockref(__func__, __LINE__, inode,                  \
2970                             (__le32 *)(bh)->b_data,                     \
2971                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2972
2973 #define ext4_ind_check_inode(inode)                                     \
2974         ext4_check_blockref(__func__, __LINE__, inode,                  \
2975                             EXT4_I(inode)->i_data,                      \
2976                             EXT4_NDIR_BLOCKS)
2977
2978 /*
2979  * Inodes and files operations
2980  */
2981
2982 /* dir.c */
2983 extern const struct file_operations ext4_dir_operations;
2984
2985 /* file.c */
2986 extern const struct inode_operations ext4_file_inode_operations;
2987 extern const struct file_operations ext4_file_operations;
2988 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2989
2990 /* inline.c */
2991 extern int ext4_get_max_inline_size(struct inode *inode);
2992 extern int ext4_find_inline_data_nolock(struct inode *inode);
2993 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2994                                  unsigned int len);
2995 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2996
2997 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2998 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2999                                          struct inode *inode,
3000                                          loff_t pos, unsigned len,
3001                                          unsigned flags,
3002                                          struct page **pagep);
3003 extern int ext4_write_inline_data_end(struct inode *inode,
3004                                       loff_t pos, unsigned len,
3005                                       unsigned copied,
3006                                       struct page *page);
3007 extern struct buffer_head *
3008 ext4_journalled_write_inline_data(struct inode *inode,
3009                                   unsigned len,
3010                                   struct page *page);
3011 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3012                                            struct inode *inode,
3013                                            loff_t pos, unsigned len,
3014                                            unsigned flags,
3015                                            struct page **pagep,
3016                                            void **fsdata);
3017 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3018                                          unsigned len, unsigned copied,
3019                                          struct page *page);
3020 extern int ext4_try_add_inline_entry(handle_t *handle,
3021                                      struct ext4_filename *fname,
3022                                      struct inode *dir, struct inode *inode);
3023 extern int ext4_try_create_inline_dir(handle_t *handle,
3024                                       struct inode *parent,
3025                                       struct inode *inode);
3026 extern int ext4_read_inline_dir(struct file *filp,
3027                                 struct dir_context *ctx,
3028                                 int *has_inline_data);
3029 extern int htree_inlinedir_to_tree(struct file *dir_file,
3030                                    struct inode *dir, ext4_lblk_t block,
3031                                    struct dx_hash_info *hinfo,
3032                                    __u32 start_hash, __u32 start_minor_hash,
3033                                    int *has_inline_data);
3034 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3035                                         struct ext4_filename *fname,
3036                                         struct ext4_dir_entry_2 **res_dir,
3037                                         int *has_inline_data);
3038 extern int ext4_delete_inline_entry(handle_t *handle,
3039                                     struct inode *dir,
3040                                     struct ext4_dir_entry_2 *de_del,
3041                                     struct buffer_head *bh,
3042                                     int *has_inline_data);
3043 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3044 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3045                                         struct ext4_dir_entry_2 **parent_de,
3046                                         int *retval);
3047 extern int ext4_inline_data_fiemap(struct inode *inode,
3048                                    struct fiemap_extent_info *fieinfo,
3049                                    int *has_inline, __u64 start, __u64 len);
3050 extern int ext4_try_to_evict_inline_data(handle_t *handle,
3051                                          struct inode *inode,
3052                                          int needed);
3053 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3054
3055 extern int ext4_convert_inline_data(struct inode *inode);
3056
3057 static inline int ext4_has_inline_data(struct inode *inode)
3058 {
3059         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3060                EXT4_I(inode)->i_inline_off;
3061 }
3062
3063 /* namei.c */
3064 extern const struct inode_operations ext4_dir_inode_operations;
3065 extern const struct inode_operations ext4_special_inode_operations;
3066 extern struct dentry *ext4_get_parent(struct dentry *child);
3067 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3068                                  struct ext4_dir_entry_2 *de,
3069                                  int blocksize, int csum_size,
3070                                  unsigned int parent_ino, int dotdot_real_len);
3071 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3072                                    unsigned int blocksize);
3073 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3074                                          struct inode *inode,
3075                                          struct buffer_head *bh);
3076 #define S_SHIFT 12
3077 static const unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3078         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3079         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3080         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3081         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3082         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3083         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3084         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3085 };
3086
3087 static inline void ext4_set_de_type(struct super_block *sb,
3088                                 struct ext4_dir_entry_2 *de,
3089                                 umode_t mode) {
3090         if (ext4_has_feature_filetype(sb))
3091                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3092 }
3093
3094 /* readpages.c */
3095 extern int ext4_mpage_readpages(struct address_space *mapping,
3096                                 struct list_head *pages, struct page *page,
3097                                 unsigned nr_pages);
3098
3099 /* symlink.c */
3100 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3101 extern const struct inode_operations ext4_symlink_inode_operations;
3102 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3103
3104 /* sysfs.c */
3105 extern int ext4_register_sysfs(struct super_block *sb);
3106 extern void ext4_unregister_sysfs(struct super_block *sb);
3107 extern int __init ext4_init_sysfs(void);
3108 extern void ext4_exit_sysfs(void);
3109
3110 /* block_validity */
3111 extern void ext4_release_system_zone(struct super_block *sb);
3112 extern int ext4_setup_system_zone(struct super_block *sb);
3113 extern int __init ext4_init_system_zone(void);
3114 extern void ext4_exit_system_zone(void);
3115 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3116                                  ext4_fsblk_t start_blk,
3117                                  unsigned int count);
3118 extern int ext4_check_blockref(const char *, unsigned int,
3119                                struct inode *, __le32 *, unsigned int);
3120
3121 /* extents.c */
3122 struct ext4_ext_path;
3123 struct ext4_extent;
3124
3125 /*
3126  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3127  * __le32.
3128  */
3129 #define EXT_MAX_BLOCKS  0xffffffff
3130
3131 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3132 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3133 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3134 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3135                                struct ext4_map_blocks *map, int flags);
3136 extern int ext4_ext_truncate(handle_t *, struct inode *);
3137 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3138                                  ext4_lblk_t end);
3139 extern void ext4_ext_init(struct super_block *);
3140 extern void ext4_ext_release(struct super_block *);
3141 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3142                           loff_t len);
3143 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3144                                           loff_t offset, ssize_t len);
3145 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3146                            struct ext4_map_blocks *map, int flags);
3147 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3148                                          ext4_lblk_t lblocks);
3149 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3150                                                    int num,
3151                                                    struct ext4_ext_path *path);
3152 extern int ext4_can_extents_be_merged(struct inode *inode,
3153                                       struct ext4_extent *ex1,
3154                                       struct ext4_extent *ex2);
3155 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3156                                   struct ext4_ext_path **,
3157                                   struct ext4_extent *, int);
3158 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3159                                               struct ext4_ext_path **,
3160                                               int flags);
3161 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3162 extern int ext4_ext_check_inode(struct inode *inode);
3163 extern int ext4_find_delalloc_range(struct inode *inode,
3164                                     ext4_lblk_t lblk_start,
3165                                     ext4_lblk_t lblk_end);
3166 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3167 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3168 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3169                         __u64 start, __u64 len);
3170 extern int ext4_ext_precache(struct inode *inode);
3171 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3172 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3173 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3174                                 struct inode *inode2, ext4_lblk_t lblk1,
3175                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3176                              int mark_unwritten,int *err);
3177
3178 /* move_extent.c */
3179 extern void ext4_double_down_write_data_sem(struct inode *first,
3180                                             struct inode *second);
3181 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3182                                           struct inode *donor_inode);
3183 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3184                              __u64 start_orig, __u64 start_donor,
3185                              __u64 len, __u64 *moved_len);
3186
3187 /* page-io.c */
3188 extern int __init ext4_init_pageio(void);
3189 extern void ext4_exit_pageio(void);
3190 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3191 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3192 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3193 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3194 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3195                                 struct writeback_control *wbc);
3196 extern void ext4_end_io_rsv_work(struct work_struct *work);
3197 extern void ext4_io_submit(struct ext4_io_submit *io);
3198 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3199                                struct page *page,
3200                                int len,
3201                                struct writeback_control *wbc,
3202                                bool keep_towrite);
3203
3204 /* mmp.c */
3205 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3206
3207 /*
3208  * Add new method to test whether block and inode bitmaps are properly
3209  * initialized. With uninit_bg reading the block from disk is not enough
3210  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3211  */
3212 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3213
3214 static inline int bitmap_uptodate(struct buffer_head *bh)
3215 {
3216         return (buffer_uptodate(bh) &&
3217                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3218 }
3219 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3220 {
3221         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3222 }
3223
3224 /*
3225  * Disable DIO read nolock optimization, so new dioreaders will be forced
3226  * to grab i_mutex
3227  */
3228 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3229 {
3230         ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3231         smp_mb();
3232 }
3233 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3234 {
3235         smp_mb();
3236         ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3237 }
3238
3239 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3240
3241 /* For ioend & aio unwritten conversion wait queues */
3242 #define EXT4_WQ_HASH_SZ         37
3243 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3244                                             EXT4_WQ_HASH_SZ])
3245 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3246
3247 extern int ext4_resize_begin(struct super_block *sb);
3248 extern void ext4_resize_end(struct super_block *sb);
3249
3250 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3251                                               struct ext4_io_end *io_end)
3252 {
3253         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3254                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3255                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3256         }
3257 }
3258
3259 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3260 {
3261         struct inode *inode = io_end->inode;
3262
3263         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3264                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3265                 /* Wake up anyone waiting on unwritten extent conversion */
3266                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3267                         wake_up_all(ext4_ioend_wq(inode));
3268         }
3269 }
3270
3271 extern const struct iomap_ops ext4_iomap_ops;
3272
3273 #endif  /* __KERNEL__ */
3274
3275 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3276 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3277
3278 #endif  /* _EXT4_H */