fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card ([email protected])
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/version.h>
  31 #include <linux/wait.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/blockgroup_lock.h>
  34 #include <linux/percpu_counter.h>
  35 #include <linux/ratelimit.h>
  36 #include <crypto/hash.h>
  37 #include <linux/falloc.h>
  38 #include <linux/percpu-rwsem.h>
  39 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #include <linux/fscrypt.h>
  44
  45 #include <linux/compiler.h>
  46
  47 /*
  48  * The fourth extended filesystem constants/structures
  49  */
  50
  51 /*
  52  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  53  * structures. these checks slow things down a lot
  54  */
  55 #define AGGRESSIVE_CHECK__
  56
  57 /*
  58  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  59  * bitmaps, maintains and uses them to check for double allocations
  60  */
  61 #define DOUBLE_CHECK__
  62
  63 /*
  64  * Define EXT4FS_DEBUG to produce debug messages
  65  */
  66 #undef EXT4FS_DEBUG
  67
  68 /*
  69  * Debug code
  70  */
  71 #ifdef EXT4FS_DEBUG
  72 #define ext4_debug(f, a...)                                             \
  73         do {                                                            \
  74                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  75                         __FILE__, __LINE__, __func__);                  \
  76                 printk(KERN_DEBUG f, ## a);                             \
  77         } while (0)
  78 #else
  79 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  80 #endif
  81
  82 /*
  83  * Turn on EXT_DEBUG to get lots of info about extents operations.
  84  */
  85 #define EXT_DEBUG__
  86 #ifdef EXT_DEBUG
  87 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  88 #else
  89 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  90 #endif
  91
  92 /* data type for block offset of block group */
  93 typedef int ext4_grpblk_t;
  94
  95 /* data type for filesystem-wide blocks number */
  96 typedef unsigned long long ext4_fsblk_t;
  97
  98 /* data type for file logical block number */
  99 typedef __u32 ext4_lblk_t;
 100
 101 /* data type for block group number */
 102 typedef unsigned int ext4_group_t;
 103
 104 enum SHIFT_DIRECTION {
 105         SHIFT_LEFT = 0,
 106         SHIFT_RIGHT,
 107 };
 108
 109 /*
 110  * Flags used in mballoc's allocation_context flags field.
 111  *
 112  * Also used to show what's going on for debugging purposes when the
 113  * flag field is exported via the traceport interface
 114  */
 115
 116 /* prefer goal again. length */
 117 #define EXT4_MB_HINT_MERGE              0x0001
 118 /* blocks already reserved */
 119 #define EXT4_MB_HINT_RESERVED           0x0002
 120 /* metadata is being allocated */
 121 #define EXT4_MB_HINT_METADATA           0x0004
 122 /* first blocks in the file */
 123 #define EXT4_MB_HINT_FIRST              0x0008
 124 /* search for the best chunk */
 125 #define EXT4_MB_HINT_BEST               0x0010
 126 /* data is being allocated */
 127 #define EXT4_MB_HINT_DATA               0x0020
 128 /* don't preallocate (for tails) */
 129 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 130 /* allocate for locality group */
 131 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 132 /* allocate goal blocks or none */
 133 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 134 /* goal is meaningful */
 135 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 136 /* blocks already pre-reserved by delayed allocation */
 137 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 138 /* We are doing stream allocation */
 139 #define EXT4_MB_STREAM_ALLOC            0x0800
 140 /* Use reserved root blocks if needed */
 141 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 142 /* Use blocks from reserved pool */
 143 #define EXT4_MB_USE_RESERVED            0x2000
 144
 145 struct ext4_allocation_request {
 146         /* target inode for block we're allocating */
 147         struct inode *inode;
 148         /* how many blocks we want to allocate */
 149         unsigned int len;
 150         /* logical block in target inode */
 151         ext4_lblk_t logical;
 152         /* the closest logical allocated block to the left */
 153         ext4_lblk_t lleft;
 154         /* the closest logical allocated block to the right */
 155         ext4_lblk_t lright;
 156         /* phys. target (a hint) */
 157         ext4_fsblk_t goal;
 158         /* phys. block for the closest logical allocated block to the left */
 159         ext4_fsblk_t pleft;
 160         /* phys. block for the closest logical allocated block to the right */
 161         ext4_fsblk_t pright;
 162         /* flags. see above EXT4_MB_HINT_* */
 163         unsigned int flags;
 164 };
 165
 166 /*
 167  * Logical to physical block mapping, used by ext4_map_blocks()
 168  *
 169  * This structure is used to pass requests into ext4_map_blocks() as
 170  * well as to store the information returned by ext4_map_blocks().  It
 171  * takes less room on the stack than a struct buffer_head.
 172  */
 173 #define EXT4_MAP_NEW            (1 << BH_New)
 174 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 175 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 176 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 177 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 178                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 179
 180 struct ext4_map_blocks {
 181         ext4_fsblk_t m_pblk;
 182         ext4_lblk_t m_lblk;
 183         unsigned int m_len;
 184         unsigned int m_flags;
 185 };
 186
 187 /*
 188  * Flags for ext4_io_end->flags
 189  */
 190 #define EXT4_IO_END_UNWRITTEN   0x0001
 191
 192 /*
 193  * For converting unwritten extents on a work queue. 'handle' is used for
 194  * buffered writeback.
 195  */
 196 typedef struct ext4_io_end {
 197         struct list_head        list;           /* per-file finished IO list */
 198         handle_t                *handle;        /* handle reserved for extent
 199                                                  * conversion */
 200         struct inode            *inode;         /* file being written to */
 201         struct bio              *bio;           /* Linked list of completed
 202                                                  * bios covering the extent */
 203         unsigned int            flag;           /* unwritten or not */
 204         atomic_t                count;          /* reference counter */
 205         loff_t                  offset;         /* offset in the file */
 206         ssize_t                 size;           /* size of the extent */
 207 } ext4_io_end_t;
 208
 209 struct ext4_io_submit {
 210         struct writeback_control *io_wbc;
 211         struct bio              *io_bio;
 212         ext4_io_end_t           *io_end;
 213         sector_t                io_next_block;
 214 };
 215
 216 /*
 217  * Special inodes numbers
 218  */
 219 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 220 #define EXT4_ROOT_INO            2      /* Root inode */
 221 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 222 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 223 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 224 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 225 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 226 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 227
 228 /* First non-reserved inode for old ext4 filesystems */
 229 #define EXT4_GOOD_OLD_FIRST_INO 11
 230
 231 /*
 232  * Maximal count of links to a file
 233  */
 234 #define EXT4_LINK_MAX           65000
 235
 236 /*
 237  * Macro-instructions used to manage several block sizes
 238  */
 239 #define EXT4_MIN_BLOCK_SIZE             1024
 240 #define EXT4_MAX_BLOCK_SIZE             65536
 241 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 242 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 243 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 244 #ifdef __KERNEL__
 245 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 246 #else
 247 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 248 #endif
 249 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 250 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 251                                          EXT4_SB(s)->s_cluster_bits)
 252 #ifdef __KERNEL__
 253 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 254 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 255 #else
 256 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 257 #endif
 258 #ifdef __KERNEL__
 259 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 260 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 261 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 262 #else
 263 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 264                                  EXT4_GOOD_OLD_INODE_SIZE : \
 265                                  (s)->s_inode_size)
 266 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 267                                  EXT4_GOOD_OLD_FIRST_INO : \
 268                                  (s)->s_first_ino)
 269 #endif
 270 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 271 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 272         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 273                                                                   blkbits))
 274
 275 /* Translate a block number to a cluster number */
 276 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 277 /* Translate a cluster number to a block number */
 278 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 279 /* Translate # of blks to # of clusters */
 280 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 281                                  (sbi)->s_cluster_bits)
 282 /* Mask out the low bits to get the starting block of the cluster */
 283 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 284                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 285 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 286                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 287 /* Get the cluster offset */
 288 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 289                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 290 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 291                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 292
 293 /*
 294  * Structure of a blocks group descriptor
 295  */
 296 struct ext4_group_desc
 297 {
 298         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 299         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 300         __le32  bg_inode_table_lo;      /* Inodes table block */
 301         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 302         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 303         __le16  bg_used_dirs_count_lo;  /* Directories count */
 304         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 305         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 306         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 307         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 308         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 309         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 310         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 311         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 312         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 313         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 314         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 315         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 316         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 317         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 318         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 319         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 320         __u32   bg_reserved;
 321 };
 322
 323 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 324         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 325          sizeof(__le16))
 326 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 327         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 328          sizeof(__le16))
 329
 330 /*
 331  * Structure of a flex block group info
 332  */
 333
 334 struct flex_groups {
 335         atomic64_t      free_clusters;
 336         atomic_t        free_inodes;
 337         atomic_t        used_dirs;
 338 };
 339
 340 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 341 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 342 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 343
 344 /*
 345  * Macro-instructions used to manage group descriptors
 346  */
 347 #define EXT4_MIN_DESC_SIZE              32
 348 #define EXT4_MIN_DESC_SIZE_64BIT        64
 349 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 350 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 351 #ifdef __KERNEL__
 352 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 353 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 354 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 355 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 356 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 357 #else
 358 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 359 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 360 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 361 #endif
 362
 363 /*
 364  * Constants relative to the data blocks
 365  */
 366 #define EXT4_NDIR_BLOCKS                12
 367 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 368 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 369 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 370 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 371
 372 /*
 373  * Inode flags
 374  */
 375 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 376 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 377 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 378 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 379 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 380 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 381 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 382 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 383 /* Reserved for compression usage... */
 384 #define EXT4_DIRTY_FL                   0x00000100
 385 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 386 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 387         /* nb: was previously EXT2_ECOMPR_FL */
 388 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 389 /* End compression flags --- maybe not all used */
 390 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 391 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 392 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 393 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 394 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 395 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 396 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 397 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 398 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 399 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 400 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 401 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 402 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 403
 404 #define EXT4_FL_USER_VISIBLE            0x304BDFFF /* User visible flags */
 405 #define EXT4_FL_USER_MODIFIABLE         0x204BC0FF /* User modifiable flags */
 406
 407 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 408 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 409                                          EXT4_IMMUTABLE_FL | \
 410                                          EXT4_APPEND_FL | \
 411                                          EXT4_NODUMP_FL | \
 412                                          EXT4_NOATIME_FL | \
 413                                          EXT4_PROJINHERIT_FL)
 414
 415 /* Flags that should be inherited by new inodes from their parent. */
 416 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 417                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 418                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 419                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 420                            EXT4_PROJINHERIT_FL)
 421
 422 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 423 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 424
 425 /* Flags that are appropriate for non-directories/regular files. */
 426 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 427
 428 /* 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 mdata_blocks;
 549         __u32 free_clusters_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 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 622
 623 /*
 624  * ioctl commands
 625  */
 626 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 627 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 628 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 629 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 630 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 631 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 632 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 633 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 634 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 635 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 636 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 637  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 638  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 639 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 640 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 641 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 642 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 643 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 644 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 645 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 646 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 647
 648 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 649 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 650
 651 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 652
 653 /*
 654  * Flags for going down operation
 655  */
 656 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 657 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 658 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 659
 660
 661 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 662 /*
 663  * ioctl commands in 32 bit emulation
 664  */
 665 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 666 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 667 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 668 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 669 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 670 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 671 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 672 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 673 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 674 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 675 #endif
 676
 677 /* Max physical block we can address w/o extents */
 678 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 679
 680 /* Max logical block we can support */
 681 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 682
 683 /*
 684  * Structure of an inode on the disk
 685  */
 686 struct ext4_inode {
 687         __le16  i_mode;         /* File mode */
 688         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 689         __le32  i_size_lo;      /* Size in bytes */
 690         __le32  i_atime;        /* Access time */
 691         __le32  i_ctime;        /* Inode Change time */
 692         __le32  i_mtime;        /* Modification time */
 693         __le32  i_dtime;        /* Deletion Time */
 694         __le16  i_gid;          /* Low 16 bits of Group Id */
 695         __le16  i_links_count;  /* Links count */
 696         __le32  i_blocks_lo;    /* Blocks count */
 697         __le32  i_flags;        /* File flags */
 698         union {
 699                 struct {
 700                         __le32  l_i_version;
 701                 } linux1;
 702                 struct {
 703                         __u32  h_i_translator;
 704                 } hurd1;
 705                 struct {
 706                         __u32  m_i_reserved1;
 707                 } masix1;
 708         } osd1;                         /* OS dependent 1 */
 709         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 710         __le32  i_generation;   /* File version (for NFS) */
 711         __le32  i_file_acl_lo;  /* File ACL */
 712         __le32  i_size_high;
 713         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 714         union {
 715                 struct {
 716                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 717                         __le16  l_i_file_acl_high;
 718                         __le16  l_i_uid_high;   /* these 2 fields */
 719                         __le16  l_i_gid_high;   /* were reserved2[0] */
 720                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 721                         __le16  l_i_reserved;
 722                 } linux2;
 723                 struct {
 724                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 725                         __u16   h_i_mode_high;
 726                         __u16   h_i_uid_high;
 727                         __u16   h_i_gid_high;
 728                         __u32   h_i_author;
 729                 } hurd2;
 730                 struct {
 731                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 732                         __le16  m_i_file_acl_high;
 733                         __u32   m_i_reserved2[2];
 734                 } masix2;
 735         } osd2;                         /* OS dependent 2 */
 736         __le16  i_extra_isize;
 737         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 738         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 739         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 740         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 741         __le32  i_crtime;       /* File Creation time */
 742         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 743         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 744         __le32  i_projid;       /* Project ID */
 745 };
 746
 747 struct move_extent {
 748         __u32 reserved;         /* should be zero */
 749         __u32 donor_fd;         /* donor file descriptor */
 750         __u64 orig_start;       /* logical start offset in block for orig */
 751         __u64 donor_start;      /* logical start offset in block for donor */
 752         __u64 len;              /* block length to be moved */
 753         __u64 moved_len;        /* moved block length */
 754 };
 755
 756 #define EXT4_EPOCH_BITS 2
 757 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 758 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 759
 760 /*
 761  * Extended fields will fit into an inode if the filesystem was formatted
 762  * with large inodes (-I 256 or larger) and there are not currently any EAs
 763  * consuming all of the available space. For new inodes we always reserve
 764  * enough space for the kernel's known extended fields, but for inodes
 765  * created with an old kernel this might not have been the case. None of
 766  * the extended inode fields is critical for correct filesystem operation.
 767  * This macro checks if a certain field fits in the inode. Note that
 768  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 769  */
 770 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 771         ((offsetof(typeof(*ext4_inode), field) +        \
 772           sizeof((ext4_inode)->field))                  \
 773         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 774             (einode)->i_extra_isize))                   \
 775
 776 /*
 777  * We use an encoding that preserves the times for extra epoch "00":
 778  *
 779  * extra  msb of                         adjust for signed
 780  * epoch  32-bit                         32-bit tv_sec to
 781  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 782  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 783  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 784  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 785  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 786  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 787  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 788  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 789  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 790  *
 791  * Note that previous versions of the kernel on 64-bit systems would
 792  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 793  * 1970.  e2fsck will correct this, assuming that it is run on the
 794  * affected filesystem before 2242.
 795  */
 796
 797 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 798 {
 799         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 800         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 801 }
 802
 803 static inline void ext4_decode_extra_time(struct timespec64 *time,
 804                                           __le32 extra)
 805 {
 806         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
 807
 808 #if 1
 809                 /* Handle legacy encoding of pre-1970 dates with epoch
 810                  * bits 1,1. (This backwards compatibility may be removed
 811                  * at the discretion of the ext4 developers.)
 812                  */
 813                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 814                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 815                         extra_bits = 0;
 816                 time->tv_sec += extra_bits << 32;
 817 #else
 818                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 819 #endif
 820         }
 821         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 822 }
 823
 824 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 825 do {                                                                            \
 826         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);                \
 827         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 828                 (raw_inode)->xtime ## _extra =                                  \
 829                                 ext4_encode_extra_time(&(inode)->xtime);        \
 830                 }                                                               \
 831 } while (0)
 832
 833 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 834 do {                                                                           \
 835         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 836                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 837         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 838                 (raw_inode)->xtime ## _extra =                                 \
 839                                 ext4_encode_extra_time(&(einode)->xtime);      \
 840 } while (0)
 841
 842 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 843 do {                                                                            \
 844         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 845         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 846                 ext4_decode_extra_time(&(inode)->xtime,                         \
 847                                        raw_inode->xtime ## _extra);             \
 848                 }                                                               \
 849         else                                                                    \
 850                 (inode)->xtime.tv_nsec = 0;                                     \
 851 } while (0)
 852
 853
 854 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 855 do {                                                                           \
 856         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 857                 (einode)->xtime.tv_sec =                                       \
 858                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 859         else                                                                   \
 860                 (einode)->xtime.tv_sec = 0;                                    \
 861         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 862                 ext4_decode_extra_time(&(einode)->xtime,                       \
 863                                        raw_inode->xtime ## _extra);            \
 864         else                                                                   \
 865                 (einode)->xtime.tv_nsec = 0;                                   \
 866 } while (0)
 867
 868 #define i_disk_version osd1.linux1.l_i_version
 869
 870 #if defined(__KERNEL__) || defined(__linux__)
 871 #define i_reserved1     osd1.linux1.l_i_reserved1
 872 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 873 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 874 #define i_uid_low       i_uid
 875 #define i_gid_low       i_gid
 876 #define i_uid_high      osd2.linux2.l_i_uid_high
 877 #define i_gid_high      osd2.linux2.l_i_gid_high
 878 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 879
 880 #elif defined(__GNU__)
 881
 882 #define i_translator    osd1.hurd1.h_i_translator
 883 #define i_uid_high      osd2.hurd2.h_i_uid_high
 884 #define i_gid_high      osd2.hurd2.h_i_gid_high
 885 #define i_author        osd2.hurd2.h_i_author
 886
 887 #elif defined(__masix__)
 888
 889 #define i_reserved1     osd1.masix1.m_i_reserved1
 890 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 891 #define i_reserved2     osd2.masix2.m_i_reserved2
 892
 893 #endif /* defined(__KERNEL__) || defined(__linux__) */
 894
 895 #include "extents_status.h"
 896
 897 /*
 898  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 899  *
 900  * These are needed to avoid lockdep false positives when we need to
 901  * allocate blocks to the quota inode during ext4_map_blocks(), while
 902  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 903  * do quota tracking for the quota inode, this avoids deadlock (as
 904  * well as infinite recursion, since it isn't turtles all the way
 905  * down...)
 906  *
 907  *  I_DATA_SEM_NORMAL - Used for most inodes
 908  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 909  *                        where the second inode has larger inode number
 910  *                        than the first
 911  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 912  */
 913 enum {
 914         I_DATA_SEM_NORMAL = 0,
 915         I_DATA_SEM_OTHER,
 916         I_DATA_SEM_QUOTA,
 917 };
 918
 919
 920 /*
 921  * fourth extended file system inode data in memory
 922  */
 923 struct ext4_inode_info {
 924         __le32  i_data[15];     /* unconverted */
 925         __u32   i_dtime;
 926         ext4_fsblk_t    i_file_acl;
 927
 928         /*
 929          * i_block_group is the number of the block group which contains
 930          * this file's inode.  Constant across the lifetime of the inode,
 931          * it is used for making block allocation decisions - we try to
 932          * place a file's data blocks near its inode block, and new inodes
 933          * near to their parent directory's inode.
 934          */
 935         ext4_group_t    i_block_group;
 936         ext4_lblk_t     i_dir_start_lookup;
 937 #if (BITS_PER_LONG < 64)
 938         unsigned long   i_state_flags;          /* Dynamic state flags */
 939 #endif
 940         unsigned long   i_flags;
 941
 942         /*
 943          * Extended attributes can be read independently of the main file
 944          * data. Taking i_mutex even when reading would cause contention
 945          * between readers of EAs and writers of regular file data, so
 946          * instead we synchronize on xattr_sem when reading or changing
 947          * EAs.
 948          */
 949         struct rw_semaphore xattr_sem;
 950
 951         struct list_head i_orphan;      /* unlinked but open inodes */
 952
 953         /*
 954          * i_disksize keeps track of what the inode size is ON DISK, not
 955          * in memory.  During truncate, i_size is set to the new size by
 956          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 957          * set i_disksize to 0 until the truncate is actually under way.
 958          *
 959          * The intent is that i_disksize always represents the blocks which
 960          * are used by this file.  This allows recovery to restart truncate
 961          * on orphans if we crash during truncate.  We actually write i_disksize
 962          * into the on-disk inode when writing inodes out, instead of i_size.
 963          *
 964          * The only time when i_disksize and i_size may be different is when
 965          * a truncate is in progress.  The only things which change i_disksize
 966          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 967          */
 968         loff_t  i_disksize;
 969
 970         /*
 971          * i_data_sem is for serialising ext4_truncate() against
 972          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 973          * data tree are chopped off during truncate. We can't do that in
 974          * ext4 because whenever we perform intermediate commits during
 975          * truncate, the inode and all the metadata blocks *must* be in a
 976          * consistent state which allows truncation of the orphans to restart
 977          * during recovery.  Hence we must fix the get_block-vs-truncate race
 978          * by other means, so we have i_data_sem.
 979          */
 980         struct rw_semaphore i_data_sem;
 981         /*
 982          * i_mmap_sem is for serializing page faults with truncate / punch hole
 983          * operations. We have to make sure that new page cannot be faulted in
 984          * a section of the inode that is being punched. We cannot easily use
 985          * i_data_sem for this since we need protection for the whole punch
 986          * operation and i_data_sem ranks below transaction start so we have
 987          * to occasionally drop it.
 988          */
 989         struct rw_semaphore i_mmap_sem;
 990         struct inode vfs_inode;
 991         struct jbd2_inode *jinode;
 992
 993         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
 994
 995         /*
 996          * File creation time. Its function is same as that of
 997          * struct timespec64 i_{a,c,m}time in the generic inode.
 998          */
 999         struct timespec64 i_crtime;
1000
1001         /* mballoc */
1002         struct list_head i_prealloc_list;
1003         spinlock_t i_prealloc_lock;
1004
1005         /* extents status tree */
1006         struct ext4_es_tree i_es_tree;
1007         rwlock_t i_es_lock;
1008         struct list_head i_es_list;
1009         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1010         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1011         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1012                                            extents to shrink. Protected by
1013                                            i_es_lock  */
1014
1015         /* ialloc */
1016         ext4_group_t    i_last_alloc_group;
1017
1018         /* allocation reservation info for delalloc */
1019         /* In case of bigalloc, this refer to clusters rather than blocks */
1020         unsigned int i_reserved_data_blocks;
1021         ext4_lblk_t i_da_metadata_calc_last_lblock;
1022         int i_da_metadata_calc_len;
1023
1024         /* pending cluster reservations for bigalloc file systems */
1025         struct ext4_pending_tree i_pending_tree;
1026
1027         /* on-disk additional length */
1028         __u16 i_extra_isize;
1029
1030         /* Indicate the inline data space. */
1031         u16 i_inline_off;
1032         u16 i_inline_size;
1033
1034 #ifdef CONFIG_QUOTA
1035         /* quota space reservation, managed internally by quota code */
1036         qsize_t i_reserved_quota;
1037 #endif
1038
1039         /* Lock protecting lists below */
1040         spinlock_t i_completed_io_lock;
1041         /*
1042          * Completed IOs that need unwritten extents handling and have
1043          * transaction reserved
1044          */
1045         struct list_head i_rsv_conversion_list;
1046         struct work_struct i_rsv_conversion_work;
1047         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1048
1049         spinlock_t i_block_reservation_lock;
1050
1051         /*
1052          * Transactions that contain inode's metadata needed to complete
1053          * fsync and fdatasync, respectively.
1054          */
1055         tid_t i_sync_tid;
1056         tid_t i_datasync_tid;
1057
1058 #ifdef CONFIG_QUOTA
1059         struct dquot *i_dquot[MAXQUOTAS];
1060 #endif
1061
1062         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1063         __u32 i_csum_seed;
1064
1065         kprojid_t i_projid;
1066 };
1067
1068 /*
1069  * File system states
1070  */
1071 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1072 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1073 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1074
1075 /*
1076  * Misc. filesystem flags
1077  */
1078 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1079 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1080 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1081
1082 /*
1083  * Mount flags set via mount options or defaults
1084  */
1085 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1086 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1087 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1088 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1089 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1090 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1091 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1092 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1093 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1094 #ifdef CONFIG_FS_DAX
1095 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1096 #else
1097 #define EXT4_MOUNT_DAX                  0
1098 #endif
1099 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1100 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1101 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1102 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1103 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1104 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1105 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1106 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1107 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1108 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1109 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1110 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1111                                                  * enable enforcement for hidden
1112                                                  * quota files */
1113 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1114                                                   * enforcement for hidden quota
1115                                                   * files */
1116 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1117                                                   * enforcement */
1118 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1119 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1120 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1121 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1122 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1123 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1124 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1125 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1126 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1127
1128 /*
1129  * Mount flags set either automatically (could not be set by mount option)
1130  * based on per file system feature or property or in special cases such as
1131  * distinguishing between explicit mount option definition and default.
1132  */
1133 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1134                                                       specified delalloc */
1135 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1136                                                       size of blocksize * 8
1137                                                       blocks */
1138 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1139                                                       file systems */
1140
1141 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1142                                                 specified journal checksum */
1143
1144 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1145                                                 ~EXT4_MOUNT_##opt
1146 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1147                                                 EXT4_MOUNT_##opt
1148 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1149                                          EXT4_MOUNT_##opt)
1150
1151 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1152                                                 ~EXT4_MOUNT2_##opt
1153 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1154                                                 EXT4_MOUNT2_##opt
1155 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1156                                          EXT4_MOUNT2_##opt)
1157
1158 #define ext4_test_and_set_bit           __test_and_set_bit_le
1159 #define ext4_set_bit                    __set_bit_le
1160 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1161 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1162 #define ext4_clear_bit                  __clear_bit_le
1163 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1164 #define ext4_test_bit                   test_bit_le
1165 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1166 #define ext4_find_next_bit              find_next_bit_le
1167
1168 extern void ext4_set_bits(void *bm, int cur, int len);
1169
1170 /*
1171  * Maximal mount counts between two filesystem checks
1172  */
1173 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1174 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1175
1176 /*
1177  * Behaviour when detecting errors
1178  */
1179 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1180 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1181 #define EXT4_ERRORS_PANIC               3       /* Panic */
1182 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1183
1184 /* Metadata checksum algorithm codes */
1185 #define EXT4_CRC32C_CHKSUM              1
1186
1187 /*
1188  * Structure of the super block
1189  */
1190 struct ext4_super_block {
1191 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1192         __le32  s_blocks_count_lo;      /* Blocks count */
1193         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1194         __le32  s_free_blocks_count_lo; /* Free blocks count */
1195 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1196         __le32  s_first_data_block;     /* First Data Block */
1197         __le32  s_log_block_size;       /* Block size */
1198         __le32  s_log_cluster_size;     /* Allocation cluster size */
1199 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1200         __le32  s_clusters_per_group;   /* # Clusters per group */
1201         __le32  s_inodes_per_group;     /* # Inodes per group */
1202         __le32  s_mtime;                /* Mount time */
1203 /*30*/  __le32  s_wtime;                /* Write time */
1204         __le16  s_mnt_count;            /* Mount count */
1205         __le16  s_max_mnt_count;        /* Maximal mount count */
1206         __le16  s_magic;                /* Magic signature */
1207         __le16  s_state;                /* File system state */
1208         __le16  s_errors;               /* Behaviour when detecting errors */
1209         __le16  s_minor_rev_level;      /* minor revision level */
1210 /*40*/  __le32  s_lastcheck;            /* time of last check */
1211         __le32  s_checkinterval;        /* max. time between checks */
1212         __le32  s_creator_os;           /* OS */
1213         __le32  s_rev_level;            /* Revision level */
1214 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1215         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1216         /*
1217          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1218          *
1219          * Note: the difference between the compatible feature set and
1220          * the incompatible feature set is that if there is a bit set
1221          * in the incompatible feature set that the kernel doesn't
1222          * know about, it should refuse to mount the filesystem.
1223          *
1224          * e2fsck's requirements are more strict; if it doesn't know
1225          * about a feature in either the compatible or incompatible
1226          * feature set, it must abort and not try to meddle with
1227          * things it doesn't understand...
1228          */
1229         __le32  s_first_ino;            /* First non-reserved inode */
1230         __le16  s_inode_size;           /* size of inode structure */
1231         __le16  s_block_group_nr;       /* block group # of this superblock */
1232         __le32  s_feature_compat;       /* compatible feature set */
1233 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1234         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1235 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1236 /*78*/  char    s_volume_name[16];      /* volume name */
1237 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1238 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1239         /*
1240          * Performance hints.  Directory preallocation should only
1241          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1242          */
1243         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1244         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1245         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1246         /*
1247          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1248          */
1249 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1250 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1251         __le32  s_journal_dev;          /* device number of journal file */
1252         __le32  s_last_orphan;          /* start of list of inodes to delete */
1253         __le32  s_hash_seed[4];         /* HTREE hash seed */
1254         __u8    s_def_hash_version;     /* Default hash version to use */
1255         __u8    s_jnl_backup_type;
1256         __le16  s_desc_size;            /* size of group descriptor */
1257 /*100*/ __le32  s_default_mount_opts;
1258         __le32  s_first_meta_bg;        /* First metablock block group */
1259         __le32  s_mkfs_time;            /* When the filesystem was created */
1260         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1261         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1262 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1263         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1264         __le32  s_free_blocks_count_hi; /* Free blocks count */
1265         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1266         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1267         __le32  s_flags;                /* Miscellaneous flags */
1268         __le16  s_raid_stride;          /* RAID stride */
1269         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1270         __le64  s_mmp_block;            /* Block for multi-mount protection */
1271         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1272         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1273         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1274         __u8    s_encryption_level;     /* versioning level for encryption */
1275         __u8    s_reserved_pad;         /* Padding to next 32bits */
1276         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1277         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1278         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1279         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1280                                               snapshot's future use */
1281         __le32  s_snapshot_list;        /* inode number of the head of the
1282                                            on-disk snapshot list */
1283 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1284         __le32  s_error_count;          /* number of fs errors */
1285         __le32  s_first_error_time;     /* first time an error happened */
1286         __le32  s_first_error_ino;      /* inode involved in first error */
1287         __le64  s_first_error_block;    /* block involved of first error */
1288         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1289         __le32  s_first_error_line;     /* line number where error happened */
1290         __le32  s_last_error_time;      /* most recent time of an error */
1291         __le32  s_last_error_ino;       /* inode involved in last error */
1292         __le32  s_last_error_line;      /* line number where error happened */
1293         __le64  s_last_error_block;     /* block involved of last error */
1294         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1295 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1296         __u8    s_mount_opts[64];
1297         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1298         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1299         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1300         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1301         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1302         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1303         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1304         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1305         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1306         __u8    s_wtime_hi;
1307         __u8    s_mtime_hi;
1308         __u8    s_mkfs_time_hi;
1309         __u8    s_lastcheck_hi;
1310         __u8    s_first_error_time_hi;
1311         __u8    s_last_error_time_hi;
1312         __u8    s_pad[2];
1313         __le32  s_reserved[96];         /* Padding to the end of the block */
1314         __le32  s_checksum;             /* crc32c(superblock) */
1315 };
1316
1317 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1318
1319 #ifdef __KERNEL__
1320
1321 /*
1322  * run-time mount flags
1323  */
1324 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1325 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1326 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1327
1328 #ifdef CONFIG_FS_ENCRYPTION
1329 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1330                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1331 #else
1332 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1333 #endif
1334
1335 /* Number of quota types we support */
1336 #define EXT4_MAXQUOTAS 3
1337
1338 /*
1339  * fourth extended-fs super-block data in memory
1340  */
1341 struct ext4_sb_info {
1342         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1343         unsigned long s_inodes_per_block;/* Number of inodes per block */
1344         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1345         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1346         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1347         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1348         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1349         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1350         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1351         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1352         unsigned long s_overhead;  /* # of fs overhead clusters */
1353         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1354         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1355         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1356         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1357         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1358         struct buffer_head **s_group_desc;
1359         unsigned int s_mount_opt;
1360         unsigned int s_mount_opt2;
1361         unsigned int s_mount_flags;
1362         unsigned int s_def_mount_opt;
1363         ext4_fsblk_t s_sb_block;
1364         atomic64_t s_resv_clusters;
1365         kuid_t s_resuid;
1366         kgid_t s_resgid;
1367         unsigned short s_mount_state;
1368         unsigned short s_pad;
1369         int s_addr_per_block_bits;
1370         int s_desc_per_block_bits;
1371         int s_inode_size;
1372         int s_first_ino;
1373         unsigned int s_inode_readahead_blks;
1374         unsigned int s_inode_goal;
1375         u32 s_hash_seed[4];
1376         int s_def_hash_version;
1377         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1378         struct percpu_counter s_freeclusters_counter;
1379         struct percpu_counter s_freeinodes_counter;
1380         struct percpu_counter s_dirs_counter;
1381         struct percpu_counter s_dirtyclusters_counter;
1382         struct blockgroup_lock *s_blockgroup_lock;
1383         struct proc_dir_entry *s_proc;
1384         struct kobject s_kobj;
1385         struct completion s_kobj_unregister;
1386         struct super_block *s_sb;
1387
1388         /* Journaling */
1389         struct journal_s *s_journal;
1390         struct list_head s_orphan;
1391         struct mutex s_orphan_lock;
1392         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1393         unsigned long s_commit_interval;
1394         u32 s_max_batch_time;
1395         u32 s_min_batch_time;
1396         struct block_device *journal_bdev;
1397 #ifdef CONFIG_QUOTA
1398         /* Names of quota files with journalled quota */
1399         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1400         int s_jquota_fmt;                       /* Format of quota to use */
1401 #endif
1402         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1403         struct rb_root system_blks;
1404
1405 #ifdef EXTENTS_STATS
1406         /* ext4 extents stats */
1407         unsigned long s_ext_min;
1408         unsigned long s_ext_max;
1409         unsigned long s_depth_max;
1410         spinlock_t s_ext_stats_lock;
1411         unsigned long s_ext_blocks;
1412         unsigned long s_ext_extents;
1413 #endif
1414
1415         /* for buddy allocator */
1416         struct ext4_group_info ***s_group_info;
1417         struct inode *s_buddy_cache;
1418         spinlock_t s_md_lock;
1419         unsigned short *s_mb_offsets;
1420         unsigned int *s_mb_maxs;
1421         unsigned int s_group_info_size;
1422         unsigned int s_mb_free_pending;
1423         struct list_head s_freed_data_list;     /* List of blocks to be freed
1424                                                    after commit completed */
1425
1426         /* tunables */
1427         unsigned long s_stripe;
1428         unsigned int s_mb_stream_request;
1429         unsigned int s_mb_max_to_scan;
1430         unsigned int s_mb_min_to_scan;
1431         unsigned int s_mb_stats;
1432         unsigned int s_mb_order2_reqs;
1433         unsigned int s_mb_group_prealloc;
1434         unsigned int s_max_dir_size_kb;
1435         /* where last allocation was done - for stream allocation */
1436         unsigned long s_mb_last_group;
1437         unsigned long s_mb_last_start;
1438
1439         /* stats for buddy allocator */
1440         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1441         atomic_t s_bal_success; /* we found long enough chunks */
1442         atomic_t s_bal_allocated;       /* in blocks */
1443         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1444         atomic_t s_bal_goals;   /* goal hits */
1445         atomic_t s_bal_breaks;  /* too long searches */
1446         atomic_t s_bal_2orders; /* 2^order hits */
1447         spinlock_t s_bal_lock;
1448         unsigned long s_mb_buddies_generated;
1449         unsigned long long s_mb_generation_time;
1450         atomic_t s_mb_lost_chunks;
1451         atomic_t s_mb_preallocated;
1452         atomic_t s_mb_discarded;
1453         atomic_t s_lock_busy;
1454
1455         /* locality groups */
1456         struct ext4_locality_group __percpu *s_locality_groups;
1457
1458         /* for write statistics */
1459         unsigned long s_sectors_written_start;
1460         u64 s_kbytes_written;
1461
1462         /* the size of zero-out chunk */
1463         unsigned int s_extent_max_zeroout_kb;
1464
1465         unsigned int s_log_groups_per_flex;
1466         struct flex_groups *s_flex_groups;
1467         ext4_group_t s_flex_groups_allocated;
1468
1469         /* workqueue for reserved extent conversions (buffered io) */
1470         struct workqueue_struct *rsv_conversion_wq;
1471
1472         /* timer for periodic error stats printing */
1473         struct timer_list s_err_report;
1474
1475         /* Lazy inode table initialization info */
1476         struct ext4_li_request *s_li_request;
1477         /* Wait multiplier for lazy initialization thread */
1478         unsigned int s_li_wait_mult;
1479
1480         /* Kernel thread for multiple mount protection */
1481         struct task_struct *s_mmp_tsk;
1482
1483         /* record the last minlen when FITRIM is called. */
1484         atomic_t s_last_trim_minblks;
1485
1486         /* Reference to checksum algorithm driver via cryptoapi */
1487         struct crypto_shash *s_chksum_driver;
1488
1489         /* Precomputed FS UUID checksum for seeding other checksums */
1490         __u32 s_csum_seed;
1491
1492         /* Reclaim extents from extent status tree */
1493         struct shrinker s_es_shrinker;
1494         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1495         long s_es_nr_inode;
1496         struct ext4_es_stats s_es_stats;
1497         struct mb_cache *s_ea_block_cache;
1498         struct mb_cache *s_ea_inode_cache;
1499         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1500
1501         /* Ratelimit ext4 messages. */
1502         struct ratelimit_state s_err_ratelimit_state;
1503         struct ratelimit_state s_warning_ratelimit_state;
1504         struct ratelimit_state s_msg_ratelimit_state;
1505
1506         /* Barrier between changing inodes' journal flags and writepages ops. */
1507         struct percpu_rw_semaphore s_journal_flag_rwsem;
1508         struct dax_device *s_daxdev;
1509 };
1510
1511 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1512 {
1513         return sb->s_fs_info;
1514 }
1515 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1516 {
1517         return container_of(inode, struct ext4_inode_info, vfs_inode);
1518 }
1519
1520 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1521 {
1522         return ino == EXT4_ROOT_INO ||
1523                 (ino >= EXT4_FIRST_INO(sb) &&
1524                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1525 }
1526
1527 /*
1528  * Inode dynamic state flags
1529  */
1530 enum {
1531         EXT4_STATE_JDATA,               /* journaled data exists */
1532         EXT4_STATE_NEW,                 /* inode is newly created */
1533         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1534         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1535         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1536         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1537         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1538         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1539         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1540         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1541         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1542 };
1543
1544 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1545 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1546 {                                                                       \
1547         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1548 }                                                                       \
1549 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1550 {                                                                       \
1551         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1552 }                                                                       \
1553 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1554 {                                                                       \
1555         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1556 }
1557
1558 /* Add these declarations here only so that these functions can be
1559  * found by name.  Otherwise, they are very hard to locate. */
1560 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1561 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1562 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1563 EXT4_INODE_BIT_FNS(flag, flags, 0)
1564
1565 /* Add these declarations here only so that these functions can be
1566  * found by name.  Otherwise, they are very hard to locate. */
1567 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1568 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1569 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1570 #if (BITS_PER_LONG < 64)
1571 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1572
1573 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1574 {
1575         (ei)->i_state_flags = 0;
1576 }
1577 #else
1578 EXT4_INODE_BIT_FNS(state, flags, 32)
1579
1580 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1581 {
1582         /* We depend on the fact that callers will set i_flags */
1583 }
1584 #endif
1585 #else
1586 /* Assume that user mode programs are passing in an ext4fs superblock, not
1587  * a kernel struct super_block.  This will allow us to call the feature-test
1588  * macros from user land. */
1589 #define EXT4_SB(sb)     (sb)
1590 #endif
1591
1592 /*
1593  * Returns true if the inode is inode is encrypted
1594  */
1595 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1596
1597 /*
1598  * Codes for operating systems
1599  */
1600 #define EXT4_OS_LINUX           0
1601 #define EXT4_OS_HURD            1
1602 #define EXT4_OS_MASIX           2
1603 #define EXT4_OS_FREEBSD         3
1604 #define EXT4_OS_LITES           4
1605
1606 /*
1607  * Revision levels
1608  */
1609 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1610 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1611
1612 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1613 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1614
1615 #define EXT4_GOOD_OLD_INODE_SIZE 128
1616
1617 /*
1618  * Feature set definitions
1619  */
1620
1621 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1622 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1623 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1624 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1625 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1626 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1627 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1628
1629 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1630 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1631 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1632 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1633 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1634 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1635 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1636 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1637 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1638 /*
1639  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1640  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1641  * all other data structures' checksums.  However, the METADATA_CSUM and
1642  * GDT_CSUM bits are mutually exclusive.
1643  */
1644 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1645 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1646 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1647
1648 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1649 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1650 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1651 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1652 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1653 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1654 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1655 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1656 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1657 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1658 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1659 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1660 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1661 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1662 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1663
1664 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1665 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1666 { \
1667         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1668                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1669 } \
1670 static inline void ext4_set_feature_##name(struct super_block *sb) \
1671 { \
1672         EXT4_SB(sb)->s_es->s_feature_compat |= \
1673                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1674 } \
1675 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1676 { \
1677         EXT4_SB(sb)->s_es->s_feature_compat &= \
1678                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1679 }
1680
1681 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1682 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1683 { \
1684         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1685                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1686 } \
1687 static inline void ext4_set_feature_##name(struct super_block *sb) \
1688 { \
1689         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1690                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1691 } \
1692 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1693 { \
1694         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1695                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1696 }
1697
1698 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1699 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1700 { \
1701         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1702                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1703 } \
1704 static inline void ext4_set_feature_##name(struct super_block *sb) \
1705 { \
1706         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1707                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1708 } \
1709 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1710 { \
1711         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1712                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1713 }
1714
1715 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1716 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1717 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1718 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1719 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1720 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1721 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1722
1723 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1724 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1725 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1726 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1727 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1728 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1729 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1730 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1731 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1732 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1733 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1734 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1735
1736 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1737 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1738 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1739 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1740 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1741 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1742 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1743 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1744 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1745 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1746 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1747 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1748 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1749 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1750 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1751
1752 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1753 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1754                                          EXT4_FEATURE_INCOMPAT_META_BG)
1755 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1756                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1757                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1758
1759 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1760 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1761                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1762                                          EXT4_FEATURE_INCOMPAT_META_BG)
1763 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1764                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1765                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1766
1767 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1768 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1769                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1770                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1771                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1772                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1773                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1774                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1775                                          EXT4_FEATURE_INCOMPAT_MMP | \
1776                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1777                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1778                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1779                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1780 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1781                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1782                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1783                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1784                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1785                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1786                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1787                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1788                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1789                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1790                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1791
1792 #define EXTN_FEATURE_FUNCS(ver) \
1793 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1794 { \
1795         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1796                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1797 } \
1798 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1799 { \
1800         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1801                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1802 } \
1803 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1804 { \
1805         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1806                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1807 }
1808
1809 EXTN_FEATURE_FUNCS(2)
1810 EXTN_FEATURE_FUNCS(3)
1811 EXTN_FEATURE_FUNCS(4)
1812
1813 static inline bool ext4_has_compat_features(struct super_block *sb)
1814 {
1815         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1816 }
1817 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1818 {
1819         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1820 }
1821 static inline bool ext4_has_incompat_features(struct super_block *sb)
1822 {
1823         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1824 }
1825
1826 /*
1827  * Superblock flags
1828  */
1829 #define EXT4_FLAGS_RESIZING     0
1830 #define EXT4_FLAGS_SHUTDOWN     1
1831
1832 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1833 {
1834         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1835 }
1836
1837
1838 /*
1839  * Default values for user and/or group using reserved blocks
1840  */
1841 #define EXT4_DEF_RESUID         0
1842 #define EXT4_DEF_RESGID         0
1843
1844 /*
1845  * Default project ID
1846  */
1847 #define EXT4_DEF_PROJID         0
1848
1849 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1850
1851 /*
1852  * Default mount options
1853  */
1854 #define EXT4_DEFM_DEBUG         0x0001
1855 #define EXT4_DEFM_BSDGROUPS     0x0002
1856 #define EXT4_DEFM_XATTR_USER    0x0004
1857 #define EXT4_DEFM_ACL           0x0008
1858 #define EXT4_DEFM_UID16         0x0010
1859 #define EXT4_DEFM_JMODE         0x0060
1860 #define EXT4_DEFM_JMODE_DATA    0x0020
1861 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1862 #define EXT4_DEFM_JMODE_WBACK   0x0060
1863 #define EXT4_DEFM_NOBARRIER     0x0100
1864 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1865 #define EXT4_DEFM_DISCARD       0x0400
1866 #define EXT4_DEFM_NODELALLOC    0x0800
1867
1868 /*
1869  * Default journal batch times
1870  */
1871 #define EXT4_DEF_MIN_BATCH_TIME 0
1872 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1873
1874 /*
1875  * Minimum number of groups in a flexgroup before we separate out
1876  * directories into the first block group of a flexgroup
1877  */
1878 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1879
1880 /*
1881  * Structure of a directory entry
1882  */
1883 #define EXT4_NAME_LEN 255
1884
1885 struct ext4_dir_entry {
1886         __le32  inode;                  /* Inode number */
1887         __le16  rec_len;                /* Directory entry length */
1888         __le16  name_len;               /* Name length */
1889         char    name[EXT4_NAME_LEN];    /* File name */
1890 };
1891
1892 /*
1893  * The new version of the directory entry.  Since EXT4 structures are
1894  * stored in intel byte order, and the name_len field could never be
1895  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1896  * file_type field.
1897  */
1898 struct ext4_dir_entry_2 {
1899         __le32  inode;                  /* Inode number */
1900         __le16  rec_len;                /* Directory entry length */
1901         __u8    name_len;               /* Name length */
1902         __u8    file_type;
1903         char    name[EXT4_NAME_LEN];    /* File name */
1904 };
1905
1906 /*
1907  * This is a bogus directory entry at the end of each leaf block that
1908  * records checksums.
1909  */
1910 struct ext4_dir_entry_tail {
1911         __le32  det_reserved_zero1;     /* Pretend to be unused */
1912         __le16  det_rec_len;            /* 12 */
1913         __u8    det_reserved_zero2;     /* Zero name length */
1914         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1915         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1916 };
1917
1918 #define EXT4_DIRENT_TAIL(block, blocksize) \
1919         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1920                                         ((blocksize) - \
1921                                          sizeof(struct ext4_dir_entry_tail))))
1922
1923 /*
1924  * Ext4 directory file types.  Only the low 3 bits are used.  The
1925  * other bits are reserved for now.
1926  */
1927 #define EXT4_FT_UNKNOWN         0
1928 #define EXT4_FT_REG_FILE        1
1929 #define EXT4_FT_DIR             2
1930 #define EXT4_FT_CHRDEV          3
1931 #define EXT4_FT_BLKDEV          4
1932 #define EXT4_FT_FIFO            5
1933 #define EXT4_FT_SOCK            6
1934 #define EXT4_FT_SYMLINK         7
1935
1936 #define EXT4_FT_MAX             8
1937
1938 #define EXT4_FT_DIR_CSUM        0xDE
1939
1940 /*
1941  * EXT4_DIR_PAD defines the directory entries boundaries
1942  *
1943  * NOTE: It must be a multiple of 4
1944  */
1945 #define EXT4_DIR_PAD                    4
1946 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1947 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1948                                          ~EXT4_DIR_ROUND)
1949 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1950
1951 /*
1952  * If we ever get support for fs block sizes > page_size, we'll need
1953  * to remove the #if statements in the next two functions...
1954  */
1955 static inline unsigned int
1956 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1957 {
1958         unsigned len = le16_to_cpu(dlen);
1959
1960 #if (PAGE_SIZE >= 65536)
1961         if (len == EXT4_MAX_REC_LEN || len == 0)
1962                 return blocksize;
1963         return (len & 65532) | ((len & 3) << 16);
1964 #else
1965         return len;
1966 #endif
1967 }
1968
1969 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1970 {
1971         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1972                 BUG();
1973 #if (PAGE_SIZE >= 65536)
1974         if (len < 65536)
1975                 return cpu_to_le16(len);
1976         if (len == blocksize) {
1977                 if (blocksize == 65536)
1978                         return cpu_to_le16(EXT4_MAX_REC_LEN);
1979                 else
1980                         return cpu_to_le16(0);
1981         }
1982         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1983 #else
1984         return cpu_to_le16(len);
1985 #endif
1986 }
1987
1988 /*
1989  * Hash Tree Directory indexing
1990  * (c) Daniel Phillips, 2001
1991  */
1992
1993 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
1994                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1995 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
1996                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
1997 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1998
1999 /* Legal values for the dx_root hash_version field: */
2000
2001 #define DX_HASH_LEGACY                  0
2002 #define DX_HASH_HALF_MD4                1
2003 #define DX_HASH_TEA                     2
2004 #define DX_HASH_LEGACY_UNSIGNED         3
2005 #define DX_HASH_HALF_MD4_UNSIGNED       4
2006 #define DX_HASH_TEA_UNSIGNED            5
2007
2008 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2009                               const void *address, unsigned int length)
2010 {
2011         struct {
2012                 struct shash_desc shash;
2013                 char ctx[4];
2014         } desc;
2015
2016         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2017
2018         desc.shash.tfm = sbi->s_chksum_driver;
2019         desc.shash.flags = 0;
2020         *(u32 *)desc.ctx = crc;
2021
2022         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2023
2024         return *(u32 *)desc.ctx;
2025 }
2026
2027 #ifdef __KERNEL__
2028
2029 /* hash info structure used by the directory hash */
2030 struct dx_hash_info
2031 {
2032         u32             hash;
2033         u32             minor_hash;
2034         int             hash_version;
2035         u32             *seed;
2036 };
2037
2038
2039 /* 32 and 64 bit signed EOF for dx directories */
2040 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2041 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2042
2043
2044 /*
2045  * Control parameters used by ext4_htree_next_block
2046  */
2047 #define HASH_NB_ALWAYS          1
2048
2049 struct ext4_filename {
2050         const struct qstr *usr_fname;
2051         struct fscrypt_str disk_name;
2052         struct dx_hash_info hinfo;
2053 #ifdef CONFIG_FS_ENCRYPTION
2054         struct fscrypt_str crypto_buf;
2055 #endif
2056 };
2057
2058 #define fname_name(p) ((p)->disk_name.name)
2059 #define fname_len(p)  ((p)->disk_name.len)
2060
2061 /*
2062  * Describe an inode's exact location on disk and in memory
2063  */
2064 struct ext4_iloc
2065 {
2066         struct buffer_head *bh;
2067         unsigned long offset;
2068         ext4_group_t block_group;
2069 };
2070
2071 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2072 {
2073         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2074 }
2075
2076 static inline bool ext4_is_quota_file(struct inode *inode)
2077 {
2078         return IS_NOQUOTA(inode) &&
2079                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2080 }
2081
2082 /*
2083  * This structure is stuffed into the struct file's private_data field
2084  * for directories.  It is where we put information so that we can do
2085  * readdir operations in hash tree order.
2086  */
2087 struct dir_private_info {
2088         struct rb_root  root;
2089         struct rb_node  *curr_node;
2090         struct fname    *extra_fname;
2091         loff_t          last_pos;
2092         __u32           curr_hash;
2093         __u32           curr_minor_hash;
2094         __u32           next_hash;
2095 };
2096
2097 /* calculate the first block number of the group */
2098 static inline ext4_fsblk_t
2099 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2100 {
2101         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2102                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2103 }
2104
2105 /*
2106  * Special error return code only used by dx_probe() and its callers.
2107  */
2108 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2109
2110 /* htree levels for ext4 */
2111 #define EXT4_HTREE_LEVEL_COMPAT 2
2112 #define EXT4_HTREE_LEVEL        3
2113
2114 static inline int ext4_dir_htree_level(struct super_block *sb)
2115 {
2116         return ext4_has_feature_largedir(sb) ?
2117                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2118 }
2119
2120 /*
2121  * Timeout and state flag for lazy initialization inode thread.
2122  */
2123 #define EXT4_DEF_LI_WAIT_MULT                   10
2124 #define EXT4_DEF_LI_MAX_START_DELAY             5
2125 #define EXT4_LAZYINIT_QUIT                      0x0001
2126 #define EXT4_LAZYINIT_RUNNING                   0x0002
2127
2128 /*
2129  * Lazy inode table initialization info
2130  */
2131 struct ext4_lazy_init {
2132         unsigned long           li_state;
2133         struct list_head        li_request_list;
2134         struct mutex            li_list_mtx;
2135 };
2136
2137 struct ext4_li_request {
2138         struct super_block      *lr_super;
2139         struct ext4_sb_info     *lr_sbi;
2140         ext4_group_t            lr_next_group;
2141         struct list_head        lr_request;
2142         unsigned long           lr_next_sched;
2143         unsigned long           lr_timeout;
2144 };
2145
2146 struct ext4_features {
2147         struct kobject f_kobj;
2148         struct completion f_kobj_unregister;
2149 };
2150
2151 /*
2152  * This structure will be used for multiple mount protection. It will be
2153  * written into the block number saved in the s_mmp_block field in the
2154  * superblock. Programs that check MMP should assume that if
2155  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2156  * to use the filesystem, regardless of how old the timestamp is.
2157  */
2158 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2159 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2160 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2161 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2162
2163 struct mmp_struct {
2164         __le32  mmp_magic;              /* Magic number for MMP */
2165         __le32  mmp_seq;                /* Sequence no. updated periodically */
2166
2167         /*
2168          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2169          * purposes and do not affect the correctness of the algorithm
2170          */
2171         __le64  mmp_time;               /* Time last updated */
2172         char    mmp_nodename[64];       /* Node which last updated MMP block */
2173         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2174
2175         /*
2176          * mmp_check_interval is used to verify if the MMP block has been
2177          * updated on the block device. The value is updated based on the
2178          * maximum time to write the MMP block during an update cycle.
2179          */
2180         __le16  mmp_check_interval;
2181
2182         __le16  mmp_pad1;
2183         __le32  mmp_pad2[226];
2184         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2185 };
2186
2187 /* arguments passed to the mmp thread */
2188 struct mmpd_data {
2189         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2190         struct super_block *sb;  /* super block of the fs */
2191 };
2192
2193 /*
2194  * Check interval multiplier
2195  * The MMP block is written every update interval and initially checked every
2196  * update interval x the multiplier (the value is then adapted based on the
2197  * write latency). The reason is that writes can be delayed under load and we
2198  * don't want readers to incorrectly assume that the filesystem is no longer
2199  * in use.
2200  */
2201 #define EXT4_MMP_CHECK_MULT             2UL
2202
2203 /*
2204  * Minimum interval for MMP checking in seconds.
2205  */
2206 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2207
2208 /*
2209  * Maximum interval for MMP checking in seconds.
2210  */
2211 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2212
2213 /*
2214  * Function prototypes
2215  */
2216
2217 /*
2218  * Ok, these declarations are also in <linux/kernel.h> but none of the
2219  * ext4 source programs needs to include it so they are duplicated here.
2220  */
2221 # define NORET_TYPE     /**/
2222 # define ATTRIB_NORET   __attribute__((noreturn))
2223 # define NORET_AND      noreturn,
2224
2225 /* bitmap.c */
2226 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2227 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2228                                 struct ext4_group_desc *gdp,
2229                                 struct buffer_head *bh, int sz);
2230 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2231                                   struct ext4_group_desc *gdp,
2232                                   struct buffer_head *bh, int sz);
2233 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2234                                 struct ext4_group_desc *gdp,
2235                                 struct buffer_head *bh);
2236 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2237                                   struct ext4_group_desc *gdp,
2238                                   struct buffer_head *bh);
2239
2240 /* balloc.c */
2241 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2242                                          ext4_fsblk_t blocknr,
2243                                          ext4_group_t *blockgrpp,
2244                                          ext4_grpblk_t *offsetp);
2245 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2246                                           ext4_fsblk_t block);
2247
2248 extern unsigned int ext4_block_group(struct super_block *sb,
2249                         ext4_fsblk_t blocknr);
2250 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2251                         ext4_fsblk_t blocknr);
2252 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2253 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2254                         ext4_group_t group);
2255 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2256                                          ext4_fsblk_t goal,
2257                                          unsigned int flags,
2258                                          unsigned long *count,
2259                                          int *errp);
2260 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2261                                     s64 nclusters, unsigned int flags);
2262 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2263 extern void ext4_check_blocks_bitmap(struct super_block *);
2264 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2265                                                     ext4_group_t block_group,
2266                                                     struct buffer_head ** bh);
2267 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2268
2269 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2270                                                 ext4_group_t block_group);
2271 extern int ext4_wait_block_bitmap(struct super_block *sb,
2272                                   ext4_group_t block_group,
2273                                   struct buffer_head *bh);
2274 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2275                                                   ext4_group_t block_group);
2276 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2277                                               ext4_group_t block_group,
2278                                               struct ext4_group_desc *gdp);
2279 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2280
2281 #ifdef CONFIG_FS_ENCRYPTION
2282 static inline int ext4_fname_setup_filename(struct inode *dir,
2283                         const struct qstr *iname,
2284                         int lookup, struct ext4_filename *fname)
2285 {
2286         struct fscrypt_name name;
2287         int err;
2288
2289         memset(fname, 0, sizeof(struct ext4_filename));
2290
2291         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2292
2293         fname->usr_fname = name.usr_fname;
2294         fname->disk_name = name.disk_name;
2295         fname->hinfo.hash = name.hash;
2296         fname->hinfo.minor_hash = name.minor_hash;
2297         fname->crypto_buf = name.crypto_buf;
2298         return err;
2299 }
2300
2301 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2302 {
2303         struct fscrypt_name name;
2304
2305         name.crypto_buf = fname->crypto_buf;
2306         fscrypt_free_filename(&name);
2307
2308         fname->crypto_buf.name = NULL;
2309         fname->usr_fname = NULL;
2310         fname->disk_name.name = NULL;
2311 }
2312 #else
2313 static inline int ext4_fname_setup_filename(struct inode *dir,
2314                 const struct qstr *iname,
2315                 int lookup, struct ext4_filename *fname)
2316 {
2317         fname->usr_fname = iname;
2318         fname->disk_name.name = (unsigned char *) iname->name;
2319         fname->disk_name.len = iname->len;
2320         return 0;
2321 }
2322 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2323
2324 #endif
2325
2326 /* dir.c */
2327 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2328                                   struct file *,
2329                                   struct ext4_dir_entry_2 *,
2330                                   struct buffer_head *, char *, int,
2331                                   unsigned int);
2332 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2333         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2334                                         (de), (bh), (buf), (size), (offset)))
2335 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2336                                 __u32 minor_hash,
2337                                 struct ext4_dir_entry_2 *dirent,
2338                                 struct fscrypt_str *ent_name);
2339 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2340 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2341                              struct buffer_head *bh,
2342                              void *buf, int buf_size,
2343                              struct ext4_filename *fname,
2344                              struct ext4_dir_entry_2 **dest_de);
2345 void ext4_insert_dentry(struct inode *inode,
2346                         struct ext4_dir_entry_2 *de,
2347                         int buf_size,
2348                         struct ext4_filename *fname);
2349 static inline void ext4_update_dx_flag(struct inode *inode)
2350 {
2351         if (!ext4_has_feature_dir_index(inode->i_sb))
2352                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2353 }
2354 static const unsigned char ext4_filetype_table[] = {
2355         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2356 };
2357
2358 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2359 {
2360         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2361                 return DT_UNKNOWN;
2362
2363         return ext4_filetype_table[filetype];
2364 }
2365 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2366                              void *buf, int buf_size);
2367
2368 /* fsync.c */
2369 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2370
2371 /* hash.c */
2372 extern int ext4fs_dirhash(const char *name, int len, struct
2373                           dx_hash_info *hinfo);
2374
2375 /* ialloc.c */
2376 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2377                                       const struct qstr *qstr, __u32 goal,
2378                                       uid_t *owner, __u32 i_flags,
2379                                       int handle_type, unsigned int line_no,
2380                                       int nblocks);
2381
2382 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2383         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2384                          i_flags, 0, 0, 0)
2385 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2386                                     type, nblocks)                  \
2387         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2388                          0, (type), __LINE__, (nblocks))
2389
2390
2391 extern void ext4_free_inode(handle_t *, struct inode *);
2392 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2393 extern unsigned long ext4_count_free_inodes(struct super_block *);
2394 extern unsigned long ext4_count_dirs(struct super_block *);
2395 extern void ext4_check_inodes_bitmap(struct super_block *);
2396 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2397 extern int ext4_init_inode_table(struct super_block *sb,
2398                                  ext4_group_t group, int barrier);
2399 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2400
2401 /* mballoc.c */
2402 extern const struct seq_operations ext4_mb_seq_groups_ops;
2403 extern long ext4_mb_stats;
2404 extern long ext4_mb_max_to_scan;
2405 extern int ext4_mb_init(struct super_block *);
2406 extern int ext4_mb_release(struct super_block *);
2407 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2408                                 struct ext4_allocation_request *, int *);
2409 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2410 extern void ext4_discard_preallocations(struct inode *);
2411 extern int __init ext4_init_mballoc(void);
2412 extern void ext4_exit_mballoc(void);
2413 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2414                              struct buffer_head *bh, ext4_fsblk_t block,
2415                              unsigned long count, int flags);
2416 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2417                                    ext4_group_t ngroups);
2418 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2419                 ext4_group_t i, struct ext4_group_desc *desc);
2420 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2421                                 ext4_fsblk_t block, unsigned long count);
2422 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2423 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2424
2425 /* inode.c */
2426 int ext4_inode_is_fast_symlink(struct inode *inode);
2427 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2428 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2429 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2430                      bool wait, struct buffer_head **bhs);
2431 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2432                              struct buffer_head *bh_result, int create);
2433 int ext4_get_block(struct inode *inode, sector_t iblock,
2434                    struct buffer_head *bh_result, int create);
2435 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2436                        struct buffer_head *bh_result, int create);
2437 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2438                            struct buffer_head *bh, int create);
2439 int ext4_walk_page_buffers(handle_t *handle,
2440                            struct buffer_head *head,
2441                            unsigned from,
2442                            unsigned to,
2443                            int *partial,
2444                            int (*fn)(handle_t *handle,
2445                                      struct buffer_head *bh));
2446 int do_journal_get_write_access(handle_t *handle,
2447                                 struct buffer_head *bh);
2448 #define FALL_BACK_TO_NONDELALLOC 1
2449 #define CONVERT_INLINE_DATA      2
2450
2451 typedef enum {
2452         EXT4_IGET_NORMAL =      0,
2453         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2454         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2455 } ext4_iget_flags;
2456
2457 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2458                                  ext4_iget_flags flags, const char *function,
2459                                  unsigned int line);
2460
2461 #define ext4_iget(sb, ino, flags) \
2462         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2463
2464 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2465 extern int  ext4_setattr(struct dentry *, struct iattr *);
2466 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2467 extern void ext4_evict_inode(struct inode *);
2468 extern void ext4_clear_inode(struct inode *);
2469 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2470 extern int  ext4_sync_inode(handle_t *, struct inode *);
2471 extern void ext4_dirty_inode(struct inode *, int);
2472 extern int ext4_change_inode_journal_flag(struct inode *, int);
2473 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2474 extern int ext4_inode_attach_jinode(struct inode *inode);
2475 extern int ext4_can_truncate(struct inode *inode);
2476 extern int ext4_truncate(struct inode *);
2477 extern int ext4_break_layouts(struct inode *);
2478 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2479 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2480 extern void ext4_set_inode_flags(struct inode *);
2481 extern int ext4_alloc_da_blocks(struct inode *inode);
2482 extern void ext4_set_aops(struct inode *inode);
2483 extern int ext4_writepage_trans_blocks(struct inode *);
2484 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2485 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2486                              loff_t lstart, loff_t lend);
2487 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2488 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2489 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2490 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2491 extern void ext4_da_release_space(struct inode *inode, int to_free);
2492 extern void ext4_da_update_reserve_space(struct inode *inode,
2493                                         int used, int quota_claim);
2494 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2495                               ext4_fsblk_t pblk, ext4_lblk_t len);
2496
2497 /* indirect.c */
2498 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2499                                 struct ext4_map_blocks *map, int flags);
2500 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2501 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2502 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2503 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2504                                  ext4_lblk_t start, ext4_lblk_t end);
2505
2506 /* ioctl.c */
2507 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2508 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2509
2510 /* migrate.c */
2511 extern int ext4_ext_migrate(struct inode *);
2512 extern int ext4_ind_migrate(struct inode *inode);
2513
2514 /* namei.c */
2515 extern int ext4_dirent_csum_verify(struct inode *inode,
2516                                    struct ext4_dir_entry *dirent);
2517 extern int ext4_orphan_add(handle_t *, struct inode *);
2518 extern int ext4_orphan_del(handle_t *, struct inode *);
2519 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2520                                 __u32 start_minor_hash, __u32 *next_hash);
2521 extern int ext4_search_dir(struct buffer_head *bh,
2522                            char *search_buf,
2523                            int buf_size,
2524                            struct inode *dir,
2525                            struct ext4_filename *fname,
2526                            unsigned int offset,
2527                            struct ext4_dir_entry_2 **res_dir);
2528 extern int ext4_generic_delete_entry(handle_t *handle,
2529                                      struct inode *dir,
2530                                      struct ext4_dir_entry_2 *de_del,
2531                                      struct buffer_head *bh,
2532                                      void *entry_buf,
2533                                      int buf_size,
2534                                      int csum_size);
2535 extern bool ext4_empty_dir(struct inode *inode);
2536
2537 /* resize.c */
2538 extern int ext4_group_add(struct super_block *sb,
2539                                 struct ext4_new_group_data *input);
2540 extern int ext4_group_extend(struct super_block *sb,
2541                                 struct ext4_super_block *es,
2542                                 ext4_fsblk_t n_blocks_count);
2543 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2544
2545 /* super.c */
2546 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2547                                          sector_t block, int op_flags);
2548 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2549 extern int ext4_calculate_overhead(struct super_block *sb);
2550 extern void ext4_superblock_csum_set(struct super_block *sb);
2551 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2552 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2553 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2554                                     ext4_group_t ngroup);
2555 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2556                                      char nbuf[16]);
2557 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2558                                              ext4_group_t block_group,
2559                                              unsigned int flags);
2560
2561 extern __printf(4, 5)
2562 void __ext4_error(struct super_block *, const char *, unsigned int,
2563                   const char *, ...);
2564 extern __printf(5, 6)
2565 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2566                       const char *, ...);
2567 extern __printf(5, 6)
2568 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2569                      const char *, ...);
2570 extern void __ext4_std_error(struct super_block *, const char *,
2571                              unsigned int, int);
2572 extern __printf(4, 5)
2573 void __ext4_abort(struct super_block *, const char *, unsigned int,
2574                   const char *, ...);
2575 extern __printf(4, 5)
2576 void __ext4_warning(struct super_block *, const char *, unsigned int,
2577                     const char *, ...);
2578 extern __printf(4, 5)
2579 void __ext4_warning_inode(const struct inode *inode, const char *function,
2580                           unsigned int line, const char *fmt, ...);
2581 extern __printf(3, 4)
2582 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2583 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2584                            const char *, unsigned int, const char *);
2585 extern __printf(7, 8)
2586 void __ext4_grp_locked_error(const char *, unsigned int,
2587                              struct super_block *, ext4_group_t,
2588                              unsigned long, ext4_fsblk_t,
2589                              const char *, ...);
2590
2591 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2592         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2593
2594 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2595         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2596
2597 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2598         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2599
2600 #ifdef CONFIG_PRINTK
2601
2602 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2603         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2604 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2605         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2606 #define ext4_error(sb, fmt, ...)                                        \
2607         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2608 #define ext4_abort(sb, fmt, ...)                                        \
2609         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2610 #define ext4_warning(sb, fmt, ...)                                      \
2611         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2612 #define ext4_warning_inode(inode, fmt, ...)                             \
2613         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2614 #define ext4_msg(sb, level, fmt, ...)                           \
2615         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2616 #define dump_mmp_msg(sb, mmp, msg)                                      \
2617         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2618 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2619         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2620                                 fmt, ##__VA_ARGS__)
2621
2622 #else
2623
2624 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2625 do {                                                                    \
2626         no_printk(fmt, ##__VA_ARGS__);                                  \
2627         __ext4_error_inode(inode, "", 0, block, " ");                   \
2628 } while (0)
2629 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2630 do {                                                                    \
2631         no_printk(fmt, ##__VA_ARGS__);                                  \
2632         __ext4_error_file(file, "", 0, block, " ");                     \
2633 } while (0)
2634 #define ext4_error(sb, fmt, ...)                                        \
2635 do {                                                                    \
2636         no_printk(fmt, ##__VA_ARGS__);                                  \
2637         __ext4_error(sb, "", 0, " ");                                   \
2638 } while (0)
2639 #define ext4_abort(sb, fmt, ...)                                        \
2640 do {                                                                    \
2641         no_printk(fmt, ##__VA_ARGS__);                                  \
2642         __ext4_abort(sb, "", 0, " ");                                   \
2643 } while (0)
2644 #define ext4_warning(sb, fmt, ...)                                      \
2645 do {                                                                    \
2646         no_printk(fmt, ##__VA_ARGS__);                                  \
2647         __ext4_warning(sb, "", 0, " ");                                 \
2648 } while (0)
2649 #define ext4_warning_inode(inode, fmt, ...)                             \
2650 do {                                                                    \
2651         no_printk(fmt, ##__VA_ARGS__);                                  \
2652         __ext4_warning_inode(inode, "", 0, " ");                        \
2653 } while (0)
2654 #define ext4_msg(sb, level, fmt, ...)                                   \
2655 do {                                                                    \
2656         no_printk(fmt, ##__VA_ARGS__);                                  \
2657         __ext4_msg(sb, "", " ");                                        \
2658 } while (0)
2659 #define dump_mmp_msg(sb, mmp, msg)                                      \
2660         __dump_mmp_msg(sb, mmp, "", 0, "")
2661 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2662 do {                                                                    \
2663         no_printk(fmt, ##__VA_ARGS__);                          \
2664         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2665 } while (0)
2666
2667 #endif
2668
2669 extern void ext4_update_dynamic_rev(struct super_block *sb);
2670 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2671                                         __u32 compat);
2672 extern int ext4_update_rocompat_feature(handle_t *handle,
2673                                         struct super_block *sb, __u32 rocompat);
2674 extern int ext4_update_incompat_feature(handle_t *handle,
2675                                         struct super_block *sb, __u32 incompat);
2676 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2677                                       struct ext4_group_desc *bg);
2678 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2679                                       struct ext4_group_desc *bg);
2680 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2681                                      struct ext4_group_desc *bg);
2682 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2683                                       struct ext4_group_desc *bg);
2684 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2685                                  struct ext4_group_desc *bg);
2686 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2687                                 struct ext4_group_desc *bg);
2688 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2689                                    struct ext4_group_desc *bg);
2690 extern void ext4_block_bitmap_set(struct super_block *sb,
2691                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2692 extern void ext4_inode_bitmap_set(struct super_block *sb,
2693                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2694 extern void ext4_inode_table_set(struct super_block *sb,
2695                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2696 extern void ext4_free_group_clusters_set(struct super_block *sb,
2697                                          struct ext4_group_desc *bg,
2698                                          __u32 count);
2699 extern void ext4_free_inodes_set(struct super_block *sb,
2700                                 struct ext4_group_desc *bg, __u32 count);
2701 extern void ext4_used_dirs_set(struct super_block *sb,
2702                                 struct ext4_group_desc *bg, __u32 count);
2703 extern void ext4_itable_unused_set(struct super_block *sb,
2704                                    struct ext4_group_desc *bg, __u32 count);
2705 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2706                                        struct ext4_group_desc *gdp);
2707 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2708                                      struct ext4_group_desc *gdp);
2709 extern int ext4_register_li_request(struct super_block *sb,
2710                                     ext4_group_t first_not_zeroed);
2711
2712 static inline int ext4_has_metadata_csum(struct super_block *sb)
2713 {
2714         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2715                      !EXT4_SB(sb)->s_chksum_driver);
2716
2717         return ext4_has_feature_metadata_csum(sb) &&
2718                (EXT4_SB(sb)->s_chksum_driver != NULL);
2719 }
2720
2721 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2722 {
2723         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2724 }
2725
2726 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2727 {
2728         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2729                 le32_to_cpu(es->s_blocks_count_lo);
2730 }
2731
2732 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2733 {
2734         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2735                 le32_to_cpu(es->s_r_blocks_count_lo);
2736 }
2737
2738 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2739 {
2740         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2741                 le32_to_cpu(es->s_free_blocks_count_lo);
2742 }
2743
2744 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2745                                          ext4_fsblk_t blk)
2746 {
2747         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2748         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2749 }
2750
2751 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2752                                               ext4_fsblk_t blk)
2753 {
2754         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2755         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2756 }
2757
2758 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2759                                            ext4_fsblk_t blk)
2760 {
2761         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2762         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2763 }
2764
2765 static inline loff_t ext4_isize(struct super_block *sb,
2766                                 struct ext4_inode *raw_inode)
2767 {
2768         if (ext4_has_feature_largedir(sb) ||
2769             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2770                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2771                         le32_to_cpu(raw_inode->i_size_lo);
2772
2773         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2774 }
2775
2776 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2777 {
2778         raw_inode->i_size_lo = cpu_to_le32(i_size);
2779         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2780 }
2781
2782 static inline
2783 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2784                                             ext4_group_t group)
2785 {
2786          struct ext4_group_info ***grp_info;
2787          long indexv, indexh;
2788          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2789          grp_info = EXT4_SB(sb)->s_group_info;
2790          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2791          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2792          return grp_info[indexv][indexh];
2793 }
2794
2795 /*
2796  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2797  * the locking protocol documented in the comments of ext4_group_add()
2798  * in resize.c
2799  */
2800 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2801 {
2802         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2803
2804         smp_rmb();
2805         return ngroups;
2806 }
2807
2808 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2809                                              ext4_group_t block_group)
2810 {
2811         return block_group >> sbi->s_log_groups_per_flex;
2812 }
2813
2814 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2815 {
2816         return 1 << sbi->s_log_groups_per_flex;
2817 }
2818
2819 #define ext4_std_error(sb, errno)                               \
2820 do {                                                            \
2821         if ((errno))                                            \
2822                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2823 } while (0)
2824
2825 #ifdef CONFIG_SMP
2826 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2827  * counters. So we need to make sure we have free clusters more
2828  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2829  */
2830 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2831 #else
2832 #define EXT4_FREECLUSTERS_WATERMARK 0
2833 #endif
2834
2835 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2836 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2837 {
2838         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2839                      !inode_is_locked(inode));
2840         down_write(&EXT4_I(inode)->i_data_sem);
2841         if (newsize > EXT4_I(inode)->i_disksize)
2842                 EXT4_I(inode)->i_disksize = newsize;
2843         up_write(&EXT4_I(inode)->i_data_sem);
2844 }
2845
2846 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2847 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2848 {
2849         int changed = 0;
2850
2851         if (newsize > inode->i_size) {
2852                 i_size_write(inode, newsize);
2853                 changed = 1;
2854         }
2855         if (newsize > EXT4_I(inode)->i_disksize) {
2856                 ext4_update_i_disksize(inode, newsize);
2857                 changed |= 2;
2858         }
2859         return changed;
2860 }
2861
2862 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2863                                       loff_t len);
2864
2865 struct ext4_group_info {
2866         unsigned long   bb_state;
2867         struct rb_root  bb_free_root;
2868         ext4_grpblk_t   bb_first_free;  /* first free block */
2869         ext4_grpblk_t   bb_free;        /* total free blocks */
2870         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2871         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2872         struct          list_head bb_prealloc_list;
2873 #ifdef DOUBLE_CHECK
2874         void            *bb_bitmap;
2875 #endif
2876         struct rw_semaphore alloc_sem;
2877         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2878                                          * regions, index is order.
2879                                          * bb_counters[3] = 5 means
2880                                          * 5 free 8-block regions. */
2881 };
2882
2883 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2884 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2885 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2886 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2887 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
2888         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2889 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
2890         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
2891
2892 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2893         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2894 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2895         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2896 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2897         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2898
2899 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2900         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2901 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2902         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2903 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2904         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2905
2906 #define EXT4_MAX_CONTENTION             8
2907 #define EXT4_CONTENTION_THRESHOLD       2
2908
2909 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2910                                               ext4_group_t group)
2911 {
2912         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2913 }
2914
2915 /*
2916  * Returns true if the filesystem is busy enough that attempts to
2917  * access the block group locks has run into contention.
2918  */
2919 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2920 {
2921         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2922 }
2923
2924 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2925 {
2926         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2927         if (spin_trylock(lock))
2928                 /*
2929                  * We're able to grab the lock right away, so drop the
2930                  * lock contention counter.
2931                  */
2932                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2933         else {
2934                 /*
2935                  * The lock is busy, so bump the contention counter,
2936                  * and then wait on the spin lock.
2937                  */
2938                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2939                                   EXT4_MAX_CONTENTION);
2940                 spin_lock(lock);
2941         }
2942 }
2943
2944 static inline void ext4_unlock_group(struct super_block *sb,
2945                                         ext4_group_t group)
2946 {
2947         spin_unlock(ext4_group_lock_ptr(sb, group));
2948 }
2949
2950 /*
2951  * Block validity checking
2952  */
2953 #define ext4_check_indirect_blockref(inode, bh)                         \
2954         ext4_check_blockref(__func__, __LINE__, inode,                  \
2955                             (__le32 *)(bh)->b_data,                     \
2956                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2957
2958 #define ext4_ind_check_inode(inode)                                     \
2959         ext4_check_blockref(__func__, __LINE__, inode,                  \
2960                             EXT4_I(inode)->i_data,                      \
2961                             EXT4_NDIR_BLOCKS)
2962
2963 /*
2964  * Inodes and files operations
2965  */
2966
2967 /* dir.c */
2968 extern const struct file_operations ext4_dir_operations;
2969
2970 /* file.c */
2971 extern const struct inode_operations ext4_file_inode_operations;
2972 extern const struct file_operations ext4_file_operations;
2973 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2974
2975 /* inline.c */
2976 extern int ext4_get_max_inline_size(struct inode *inode);
2977 extern int ext4_find_inline_data_nolock(struct inode *inode);
2978 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2979                                  unsigned int len);
2980 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2981
2982 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2983 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2984                                          struct inode *inode,
2985                                          loff_t pos, unsigned len,
2986                                          unsigned flags,
2987                                          struct page **pagep);
2988 extern int ext4_write_inline_data_end(struct inode *inode,
2989                                       loff_t pos, unsigned len,
2990                                       unsigned copied,
2991                                       struct page *page);
2992 extern struct buffer_head *
2993 ext4_journalled_write_inline_data(struct inode *inode,
2994                                   unsigned len,
2995                                   struct page *page);
2996 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2997                                            struct inode *inode,
2998                                            loff_t pos, unsigned len,
2999                                            unsigned flags,
3000                                            struct page **pagep,
3001                                            void **fsdata);
3002 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3003                                          unsigned len, unsigned copied,
3004                                          struct page *page);
3005 extern int ext4_try_add_inline_entry(handle_t *handle,
3006                                      struct ext4_filename *fname,
3007                                      struct inode *dir, struct inode *inode);
3008 extern int ext4_try_create_inline_dir(handle_t *handle,
3009                                       struct inode *parent,
3010                                       struct inode *inode);
3011 extern int ext4_read_inline_dir(struct file *filp,
3012                                 struct dir_context *ctx,
3013                                 int *has_inline_data);
3014 extern int htree_inlinedir_to_tree(struct file *dir_file,
3015                                    struct inode *dir, ext4_lblk_t block,
3016                                    struct dx_hash_info *hinfo,
3017                                    __u32 start_hash, __u32 start_minor_hash,
3018                                    int *has_inline_data);
3019 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3020                                         struct ext4_filename *fname,
3021                                         struct ext4_dir_entry_2 **res_dir,
3022                                         int *has_inline_data);
3023 extern int ext4_delete_inline_entry(handle_t *handle,
3024                                     struct inode *dir,
3025                                     struct ext4_dir_entry_2 *de_del,
3026                                     struct buffer_head *bh,
3027                                     int *has_inline_data);
3028 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3029 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3030                                         struct ext4_dir_entry_2 **parent_de,
3031                                         int *retval);
3032 extern int ext4_inline_data_fiemap(struct inode *inode,
3033                                    struct fiemap_extent_info *fieinfo,
3034                                    int *has_inline, __u64 start, __u64 len);
3035
3036 struct iomap;
3037 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3038
3039 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3040
3041 extern int ext4_convert_inline_data(struct inode *inode);
3042
3043 static inline int ext4_has_inline_data(struct inode *inode)
3044 {
3045         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3046                EXT4_I(inode)->i_inline_off;
3047 }
3048
3049 /* namei.c */
3050 extern const struct inode_operations ext4_dir_inode_operations;
3051 extern const struct inode_operations ext4_special_inode_operations;
3052 extern struct dentry *ext4_get_parent(struct dentry *child);
3053 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3054                                  struct ext4_dir_entry_2 *de,
3055                                  int blocksize, int csum_size,
3056                                  unsigned int parent_ino, int dotdot_real_len);
3057 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3058                                    unsigned int blocksize);
3059 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3060                                          struct inode *inode,
3061                                          struct buffer_head *bh);
3062 #define S_SHIFT 12
3063 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3064         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3065         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3066         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3067         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3068         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3069         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3070         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3071 };
3072
3073 static inline void ext4_set_de_type(struct super_block *sb,
3074                                 struct ext4_dir_entry_2 *de,
3075                                 umode_t mode) {
3076         if (ext4_has_feature_filetype(sb))
3077                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3078 }
3079
3080 /* readpages.c */
3081 extern int ext4_mpage_readpages(struct address_space *mapping,
3082                                 struct list_head *pages, struct page *page,
3083                                 unsigned nr_pages, bool is_readahead);
3084
3085 /* symlink.c */
3086 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3087 extern const struct inode_operations ext4_symlink_inode_operations;
3088 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3089
3090 /* sysfs.c */
3091 extern int ext4_register_sysfs(struct super_block *sb);
3092 extern void ext4_unregister_sysfs(struct super_block *sb);
3093 extern int __init ext4_init_sysfs(void);
3094 extern void ext4_exit_sysfs(void);
3095
3096 /* block_validity */
3097 extern void ext4_release_system_zone(struct super_block *sb);
3098 extern int ext4_setup_system_zone(struct super_block *sb);
3099 extern int __init ext4_init_system_zone(void);
3100 extern void ext4_exit_system_zone(void);
3101 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3102                                  ext4_fsblk_t start_blk,
3103                                  unsigned int count);
3104 extern int ext4_check_blockref(const char *, unsigned int,
3105                                struct inode *, __le32 *, unsigned int);
3106
3107 /* extents.c */
3108 struct ext4_ext_path;
3109 struct ext4_extent;
3110
3111 /*
3112  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3113  * __le32.
3114  */
3115 #define EXT_MAX_BLOCKS  0xffffffff
3116
3117 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3118 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3119 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3120 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3121                                struct ext4_map_blocks *map, int flags);
3122 extern int ext4_ext_truncate(handle_t *, struct inode *);
3123 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3124                                  ext4_lblk_t end);
3125 extern void ext4_ext_init(struct super_block *);
3126 extern void ext4_ext_release(struct super_block *);
3127 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3128                           loff_t len);
3129 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3130                                           loff_t offset, ssize_t len);
3131 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3132                            struct ext4_map_blocks *map, int flags);
3133 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3134                                          ext4_lblk_t lblocks);
3135 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3136                                                    int num,
3137                                                    struct ext4_ext_path *path);
3138 extern int ext4_can_extents_be_merged(struct inode *inode,
3139                                       struct ext4_extent *ex1,
3140                                       struct ext4_extent *ex2);
3141 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3142                                   struct ext4_ext_path **,
3143                                   struct ext4_extent *, int);
3144 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3145                                               struct ext4_ext_path **,
3146                                               int flags);
3147 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3148 extern int ext4_ext_check_inode(struct inode *inode);
3149 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3150 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3151                         __u64 start, __u64 len);
3152 extern int ext4_ext_precache(struct inode *inode);
3153 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3154 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3155 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3156                                 struct inode *inode2, ext4_lblk_t lblk1,
3157                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3158                              int mark_unwritten,int *err);
3159 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3160
3161 /* move_extent.c */
3162 extern void ext4_double_down_write_data_sem(struct inode *first,
3163                                             struct inode *second);
3164 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3165                                           struct inode *donor_inode);
3166 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3167                              __u64 start_orig, __u64 start_donor,
3168                              __u64 len, __u64 *moved_len);
3169
3170 /* page-io.c */
3171 extern int __init ext4_init_pageio(void);
3172 extern void ext4_exit_pageio(void);
3173 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3174 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3175 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3176 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3177 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3178                                 struct writeback_control *wbc);
3179 extern void ext4_end_io_rsv_work(struct work_struct *work);
3180 extern void ext4_io_submit(struct ext4_io_submit *io);
3181 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3182                                struct page *page,
3183                                int len,
3184                                struct writeback_control *wbc,
3185                                bool keep_towrite);
3186
3187 /* mmp.c */
3188 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3189
3190 /*
3191  * Add new method to test whether block and inode bitmaps are properly
3192  * initialized. With uninit_bg reading the block from disk is not enough
3193  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3194  */
3195 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3196
3197 static inline int bitmap_uptodate(struct buffer_head *bh)
3198 {
3199         return (buffer_uptodate(bh) &&
3200                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3201 }
3202 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3203 {
3204         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3205 }
3206
3207 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3208
3209 /* For ioend & aio unwritten conversion wait queues */
3210 #define EXT4_WQ_HASH_SZ         37
3211 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3212                                             EXT4_WQ_HASH_SZ])
3213 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3214
3215 extern int ext4_resize_begin(struct super_block *sb);
3216 extern void ext4_resize_end(struct super_block *sb);
3217
3218 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3219                                               struct ext4_io_end *io_end)
3220 {
3221         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3222                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3223                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3224         }
3225 }
3226
3227 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3228 {
3229         struct inode *inode = io_end->inode;
3230
3231         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3232                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3233                 /* Wake up anyone waiting on unwritten extent conversion */
3234                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3235                         wake_up_all(ext4_ioend_wq(inode));
3236         }
3237 }
3238
3239 extern const struct iomap_ops ext4_iomap_ops;
3240
3241 #endif  /* __KERNEL__ */
3242
3243 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3244 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3245
3246 #endif  /* _EXT4_H */