fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/version.h>
  31 #include <linux/wait.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/blockgroup_lock.h>
  34 #include <linux/percpu_counter.h>
  35 #include <linux/ratelimit.h>
  36 #include <crypto/hash.h>
  37 #include <linux/falloc.h>
  38 #include <linux/percpu-rwsem.h>
  39 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #define __FS_HAS_ENCRYPTION IS_ENABLED(CONFIG_EXT4_FS_ENCRYPTION)
  44 #include <linux/fscrypt.h>
  45
  46 #include <linux/compiler.h>
  47
  48 /* Until this gets included into linux/compiler-gcc.h */
  49 #ifndef __nonstring
  50 #if defined(GCC_VERSION) && (GCC_VERSION >= 80000)
  51 #define __nonstring __attribute__((nonstring))
  52 #else
  53 #define __nonstring
  54 #endif
  55 #endif
  56
  57 /*
  58  * The fourth extended filesystem constants/structures
  59  */
  60
  61 /*
  62  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  63  * structures. these checks slow things down a lot
  64  */
  65 #define AGGRESSIVE_CHECK__
  66
  67 /*
  68  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  69  * bitmaps, maintains and uses them to check for double allocations
  70  */
  71 #define DOUBLE_CHECK__
  72
  73 /*
  74  * Define EXT4FS_DEBUG to produce debug messages
  75  */
  76 #undef EXT4FS_DEBUG
  77
  78 /*
  79  * Debug code
  80  */
  81 #ifdef EXT4FS_DEBUG
  82 #define ext4_debug(f, a...)                                             \
  83         do {                                                            \
  84                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  85                         __FILE__, __LINE__, __func__);                  \
  86                 printk(KERN_DEBUG f, ## a);                             \
  87         } while (0)
  88 #else
  89 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  90 #endif
  91
  92 /*
  93  * Turn on EXT_DEBUG to get lots of info about extents operations.
  94  */
  95 #define EXT_DEBUG__
  96 #ifdef EXT_DEBUG
  97 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  98 #else
  99 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
 100 #endif
 101
 102 /* data type for block offset of block group */
 103 typedef int ext4_grpblk_t;
 104
 105 /* data type for filesystem-wide blocks number */
 106 typedef unsigned long long ext4_fsblk_t;
 107
 108 /* data type for file logical block number */
 109 typedef __u32 ext4_lblk_t;
 110
 111 /* data type for block group number */
 112 typedef unsigned int ext4_group_t;
 113
 114 enum SHIFT_DIRECTION {
 115         SHIFT_LEFT = 0,
 116         SHIFT_RIGHT,
 117 };
 118
 119 /*
 120  * Flags used in mballoc's allocation_context flags field.
 121  *
 122  * Also used to show what's going on for debugging purposes when the
 123  * flag field is exported via the traceport interface
 124  */
 125
 126 /* prefer goal again. length */
 127 #define EXT4_MB_HINT_MERGE              0x0001
 128 /* blocks already reserved */
 129 #define EXT4_MB_HINT_RESERVED           0x0002
 130 /* metadata is being allocated */
 131 #define EXT4_MB_HINT_METADATA           0x0004
 132 /* first blocks in the file */
 133 #define EXT4_MB_HINT_FIRST              0x0008
 134 /* search for the best chunk */
 135 #define EXT4_MB_HINT_BEST               0x0010
 136 /* data is being allocated */
 137 #define EXT4_MB_HINT_DATA               0x0020
 138 /* don't preallocate (for tails) */
 139 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 140 /* allocate for locality group */
 141 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 142 /* allocate goal blocks or none */
 143 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 144 /* goal is meaningful */
 145 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 146 /* blocks already pre-reserved by delayed allocation */
 147 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 148 /* We are doing stream allocation */
 149 #define EXT4_MB_STREAM_ALLOC            0x0800
 150 /* Use reserved root blocks if needed */
 151 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 152 /* Use blocks from reserved pool */
 153 #define EXT4_MB_USE_RESERVED            0x2000
 154
 155 struct ext4_allocation_request {
 156         /* target inode for block we're allocating */
 157         struct inode *inode;
 158         /* how many blocks we want to allocate */
 159         unsigned int len;
 160         /* logical block in target inode */
 161         ext4_lblk_t logical;
 162         /* the closest logical allocated block to the left */
 163         ext4_lblk_t lleft;
 164         /* the closest logical allocated block to the right */
 165         ext4_lblk_t lright;
 166         /* phys. target (a hint) */
 167         ext4_fsblk_t goal;
 168         /* phys. block for the closest logical allocated block to the left */
 169         ext4_fsblk_t pleft;
 170         /* phys. block for the closest logical allocated block to the right */
 171         ext4_fsblk_t pright;
 172         /* flags. see above EXT4_MB_HINT_* */
 173         unsigned int flags;
 174 };
 175
 176 /*
 177  * Logical to physical block mapping, used by ext4_map_blocks()
 178  *
 179  * This structure is used to pass requests into ext4_map_blocks() as
 180  * well as to store the information returned by ext4_map_blocks().  It
 181  * takes less room on the stack than a struct buffer_head.
 182  */
 183 #define EXT4_MAP_NEW            (1 << BH_New)
 184 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 185 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 186 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 187 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 188                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 189
 190 struct ext4_map_blocks {
 191         ext4_fsblk_t m_pblk;
 192         ext4_lblk_t m_lblk;
 193         unsigned int m_len;
 194         unsigned int m_flags;
 195 };
 196
 197 /*
 198  * Block validity checking, system zone rbtree.
 199  */
 200 struct ext4_system_blocks {
 201         struct rb_root root;
 202         struct rcu_head rcu;
 203 };
 204
 205 /*
 206  * Flags for ext4_io_end->flags
 207  */
 208 #define EXT4_IO_END_UNWRITTEN   0x0001
 209
 210 /*
 211  * For converting unwritten extents on a work queue. 'handle' is used for
 212  * buffered writeback.
 213  */
 214 typedef struct ext4_io_end {
 215         struct list_head        list;           /* per-file finished IO list */
 216         handle_t                *handle;        /* handle reserved for extent
 217                                                  * conversion */
 218         struct inode            *inode;         /* file being written to */
 219         struct bio              *bio;           /* Linked list of completed
 220                                                  * bios covering the extent */
 221         unsigned int            flag;           /* unwritten or not */
 222         atomic_t                count;          /* reference counter */
 223         loff_t                  offset;         /* offset in the file */
 224         ssize_t                 size;           /* size of the extent */
 225 } ext4_io_end_t;
 226
 227 struct ext4_io_submit {
 228         struct writeback_control *io_wbc;
 229         struct bio              *io_bio;
 230         ext4_io_end_t           *io_end;
 231         sector_t                io_next_block;
 232 };
 233
 234 /*
 235  * Special inodes numbers
 236  */
 237 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 238 #define EXT4_ROOT_INO            2      /* Root inode */
 239 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 240 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 241 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 242 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 243 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 244 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 245
 246 /* First non-reserved inode for old ext4 filesystems */
 247 #define EXT4_GOOD_OLD_FIRST_INO 11
 248
 249 /*
 250  * Maximal count of links to a file
 251  */
 252 #define EXT4_LINK_MAX           65000
 253
 254 /*
 255  * Macro-instructions used to manage several block sizes
 256  */
 257 #define EXT4_MIN_BLOCK_SIZE             1024
 258 #define EXT4_MAX_BLOCK_SIZE             65536
 259 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 260 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 261 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 262 #ifdef __KERNEL__
 263 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 264 #else
 265 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 266 #endif
 267 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 268 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 269                                          EXT4_SB(s)->s_cluster_bits)
 270 #ifdef __KERNEL__
 271 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 272 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 273 #else
 274 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 275 #endif
 276 #ifdef __KERNEL__
 277 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 278 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 279 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 280 #else
 281 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 282                                  EXT4_GOOD_OLD_INODE_SIZE : \
 283                                  (s)->s_inode_size)
 284 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 285                                  EXT4_GOOD_OLD_FIRST_INO : \
 286                                  (s)->s_first_ino)
 287 #endif
 288 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 289 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 290         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 291                                                                   blkbits))
 292
 293 /* Translate a block number to a cluster number */
 294 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 295 /* Translate a cluster number to a block number */
 296 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 297 /* Translate # of blks to # of clusters */
 298 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 299                                  (sbi)->s_cluster_bits)
 300 /* Mask out the low bits to get the starting block of the cluster */
 301 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 302                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 303 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 304                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 305 /* Get the cluster offset */
 306 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 307                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 308 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 309                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 310
 311 /*
 312  * Structure of a blocks group descriptor
 313  */
 314 struct ext4_group_desc
 315 {
 316         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 317         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 318         __le32  bg_inode_table_lo;      /* Inodes table block */
 319         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 320         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 321         __le16  bg_used_dirs_count_lo;  /* Directories count */
 322         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 323         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 324         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 325         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 326         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 327         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 328         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 329         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 330         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 331         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 332         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 333         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 334         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 335         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 336         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 337         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 338         __u32   bg_reserved;
 339 };
 340
 341 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 342         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 343          sizeof(__le16))
 344 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 345         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 346          sizeof(__le16))
 347
 348 /*
 349  * Structure of a flex block group info
 350  */
 351
 352 struct flex_groups {
 353         atomic64_t      free_clusters;
 354         atomic_t        free_inodes;
 355         atomic_t        used_dirs;
 356 };
 357
 358 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 359 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 360 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 361
 362 /*
 363  * Macro-instructions used to manage group descriptors
 364  */
 365 #define EXT4_MIN_DESC_SIZE              32
 366 #define EXT4_MIN_DESC_SIZE_64BIT        64
 367 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 368 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 369 #ifdef __KERNEL__
 370 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 371 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 372 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 373 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 374 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 375 #else
 376 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 377 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 378 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 379 #endif
 380
 381 /*
 382  * Constants relative to the data blocks
 383  */
 384 #define EXT4_NDIR_BLOCKS                12
 385 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 386 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 387 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 388 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 389
 390 /*
 391  * Inode flags
 392  */
 393 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 394 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 395 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 396 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 397 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 398 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 399 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 400 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 401 /* Reserved for compression usage... */
 402 #define EXT4_DIRTY_FL                   0x00000100
 403 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 404 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 405         /* nb: was previously EXT2_ECOMPR_FL */
 406 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 407 /* End compression flags --- maybe not all used */
 408 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 409 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 410 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 411 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 412 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 413 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 414 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 415 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 416 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 417 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 418 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 419 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 420 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 421
 422 #define EXT4_FL_USER_VISIBLE            0x304BDFFF /* User visible flags */
 423 #define EXT4_FL_USER_MODIFIABLE         0x204BC0FF /* User modifiable flags */
 424
 425 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 426 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 427                                          EXT4_IMMUTABLE_FL | \
 428                                          EXT4_APPEND_FL | \
 429                                          EXT4_NODUMP_FL | \
 430                                          EXT4_NOATIME_FL | \
 431                                          EXT4_PROJINHERIT_FL)
 432
 433 /* Flags that should be inherited by new inodes from their parent. */
 434 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 435                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 436                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 437                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 438                            EXT4_PROJINHERIT_FL)
 439
 440 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 441 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 442
 443 /* Flags that are appropriate for non-directories/regular files. */
 444 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 445
 446 /* The only flags that should be swapped */
 447 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 448
 449 /* Mask out flags that are inappropriate for the given type of inode. */
 450 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 451 {
 452         if (S_ISDIR(mode))
 453                 return flags;
 454         else if (S_ISREG(mode))
 455                 return flags & EXT4_REG_FLMASK;
 456         else
 457                 return flags & EXT4_OTHER_FLMASK;
 458 }
 459
 460 /*
 461  * Inode flags used for atomic set/get
 462  */
 463 enum {
 464         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 465         EXT4_INODE_UNRM         = 1,    /* Undelete */
 466         EXT4_INODE_COMPR        = 2,    /* Compress file */
 467         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 468         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 469         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 470         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 471         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 472 /* Reserved for compression usage... */
 473         EXT4_INODE_DIRTY        = 8,
 474         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 475         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 476         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 477 /* End compression flags --- maybe not all used */
 478         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 479         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 480         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 481         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 482         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 483         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 484         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 485         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 486         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 487         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 488         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 489         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 490         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 491 };
 492
 493 /*
 494  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 495  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 496  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 497  * any extra space in the compiled kernel image, otherwise, the build will fail.
 498  * It's important that these values are the same, since we are using
 499  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 500  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 501  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 502  * defined in e2fsprogs.
 503  *
 504  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 505  */
 506 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 507 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 508
 509 static inline void ext4_check_flag_values(void)
 510 {
 511         CHECK_FLAG_VALUE(SECRM);
 512         CHECK_FLAG_VALUE(UNRM);
 513         CHECK_FLAG_VALUE(COMPR);
 514         CHECK_FLAG_VALUE(SYNC);
 515         CHECK_FLAG_VALUE(IMMUTABLE);
 516         CHECK_FLAG_VALUE(APPEND);
 517         CHECK_FLAG_VALUE(NODUMP);
 518         CHECK_FLAG_VALUE(NOATIME);
 519         CHECK_FLAG_VALUE(DIRTY);
 520         CHECK_FLAG_VALUE(COMPRBLK);
 521         CHECK_FLAG_VALUE(NOCOMPR);
 522         CHECK_FLAG_VALUE(ENCRYPT);
 523         CHECK_FLAG_VALUE(INDEX);
 524         CHECK_FLAG_VALUE(IMAGIC);
 525         CHECK_FLAG_VALUE(JOURNAL_DATA);
 526         CHECK_FLAG_VALUE(NOTAIL);
 527         CHECK_FLAG_VALUE(DIRSYNC);
 528         CHECK_FLAG_VALUE(TOPDIR);
 529         CHECK_FLAG_VALUE(HUGE_FILE);
 530         CHECK_FLAG_VALUE(EXTENTS);
 531         CHECK_FLAG_VALUE(EA_INODE);
 532         CHECK_FLAG_VALUE(EOFBLOCKS);
 533         CHECK_FLAG_VALUE(INLINE_DATA);
 534         CHECK_FLAG_VALUE(PROJINHERIT);
 535         CHECK_FLAG_VALUE(RESERVED);
 536 }
 537
 538 /* Used to pass group descriptor data when online resize is done */
 539 struct ext4_new_group_input {
 540         __u32 group;            /* Group number for this data */
 541         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 542         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 543         __u64 inode_table;      /* Absolute block number of inode table start */
 544         __u32 blocks_count;     /* Total number of blocks in this group */
 545         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 546         __u16 unused;
 547 };
 548
 549 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 550 struct compat_ext4_new_group_input {
 551         u32 group;
 552         compat_u64 block_bitmap;
 553         compat_u64 inode_bitmap;
 554         compat_u64 inode_table;
 555         u32 blocks_count;
 556         u16 reserved_blocks;
 557         u16 unused;
 558 };
 559 #endif
 560
 561 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 562 struct ext4_new_group_data {
 563         __u32 group;
 564         __u64 block_bitmap;
 565         __u64 inode_bitmap;
 566         __u64 inode_table;
 567         __u32 blocks_count;
 568         __u16 reserved_blocks;
 569         __u16 mdata_blocks;
 570         __u32 free_clusters_count;
 571 };
 572
 573 /* Indexes used to index group tables in ext4_new_group_data */
 574 enum {
 575         BLOCK_BITMAP = 0,       /* block bitmap */
 576         INODE_BITMAP,           /* inode bitmap */
 577         INODE_TABLE,            /* inode tables */
 578         GROUP_TABLE_COUNT,
 579 };
 580
 581 /*
 582  * Flags used by ext4_map_blocks()
 583  */
 584         /* Allocate any needed blocks and/or convert an unwritten
 585            extent to be an initialized ext4 */
 586 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 587         /* Request the creation of an unwritten extent */
 588 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 589 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 590                                                  EXT4_GET_BLOCKS_CREATE)
 591         /* Caller is from the delayed allocation writeout path
 592          * finally doing the actual allocation of delayed blocks */
 593 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 594         /* caller is from the direct IO path, request to creation of an
 595         unwritten extents if not allocated, split the unwritten
 596         extent if blocks has been preallocated already*/
 597 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 598 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 599 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 600                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 601         /* Convert extent to initialized after IO complete */
 602 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 603                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 604         /* Eventual metadata allocation (due to growing extent tree)
 605          * should not fail, so try to use reserved blocks for that.*/
 606 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 607         /* Don't normalize allocation size (used for fallocate) */
 608 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 609         /* Request will not result in inode size update (user for fallocate) */
 610 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 611         /* Convert written extents to unwritten */
 612 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 613         /* Write zeros to newly created written extents */
 614 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 615 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 616                                         EXT4_GET_BLOCKS_ZERO)
 617         /* Caller will submit data before dropping transaction handle. This
 618          * allows jbd2 to avoid submitting data before commit. */
 619 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 620
 621 /*
 622  * The bit position of these flags must not overlap with any of the
 623  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 624  * read_extent_tree_block(), ext4_split_extent_at(),
 625  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 626  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 627  * caching the extents when reading from the extent tree while a
 628  * truncate or punch hole operation is in progress.
 629  */
 630 #define EXT4_EX_NOCACHE                         0x40000000
 631 #define EXT4_EX_FORCE_CACHE                     0x20000000
 632
 633 /*
 634  * Flags used by ext4_free_blocks
 635  */
 636 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 637 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 638 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 639 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 640 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 641 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 642
 643 /*
 644  * ioctl commands
 645  */
 646 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 647 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 648 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 649 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 650 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 651 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 652 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 653 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 654 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 655 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 656 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 657  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 658  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 659 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 660 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 661 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 662 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 663 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 664 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 665 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 666 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 667
 668 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 669 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 670
 671 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 672
 673 /*
 674  * Flags for going down operation
 675  */
 676 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 677 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 678 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 679
 680
 681 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 682 /*
 683  * ioctl commands in 32 bit emulation
 684  */
 685 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 686 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 687 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 688 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 689 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 690 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 691 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 692 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 693 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 694 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 695 #endif
 696
 697 /* Max physical block we can address w/o extents */
 698 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 699
 700 /* Max logical block we can support */
 701 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 702
 703 /*
 704  * Structure of an inode on the disk
 705  */
 706 struct ext4_inode {
 707         __le16  i_mode;         /* File mode */
 708         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 709         __le32  i_size_lo;      /* Size in bytes */
 710         __le32  i_atime;        /* Access time */
 711         __le32  i_ctime;        /* Inode Change time */
 712         __le32  i_mtime;        /* Modification time */
 713         __le32  i_dtime;        /* Deletion Time */
 714         __le16  i_gid;          /* Low 16 bits of Group Id */
 715         __le16  i_links_count;  /* Links count */
 716         __le32  i_blocks_lo;    /* Blocks count */
 717         __le32  i_flags;        /* File flags */
 718         union {
 719                 struct {
 720                         __le32  l_i_version;
 721                 } linux1;
 722                 struct {
 723                         __u32  h_i_translator;
 724                 } hurd1;
 725                 struct {
 726                         __u32  m_i_reserved1;
 727                 } masix1;
 728         } osd1;                         /* OS dependent 1 */
 729         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 730         __le32  i_generation;   /* File version (for NFS) */
 731         __le32  i_file_acl_lo;  /* File ACL */
 732         __le32  i_size_high;
 733         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 734         union {
 735                 struct {
 736                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 737                         __le16  l_i_file_acl_high;
 738                         __le16  l_i_uid_high;   /* these 2 fields */
 739                         __le16  l_i_gid_high;   /* were reserved2[0] */
 740                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 741                         __le16  l_i_reserved;
 742                 } linux2;
 743                 struct {
 744                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 745                         __u16   h_i_mode_high;
 746                         __u16   h_i_uid_high;
 747                         __u16   h_i_gid_high;
 748                         __u32   h_i_author;
 749                 } hurd2;
 750                 struct {
 751                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 752                         __le16  m_i_file_acl_high;
 753                         __u32   m_i_reserved2[2];
 754                 } masix2;
 755         } osd2;                         /* OS dependent 2 */
 756         __le16  i_extra_isize;
 757         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 758         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 759         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 760         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 761         __le32  i_crtime;       /* File Creation time */
 762         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 763         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 764         __le32  i_projid;       /* Project ID */
 765 };
 766
 767 struct move_extent {
 768         __u32 reserved;         /* should be zero */
 769         __u32 donor_fd;         /* donor file descriptor */
 770         __u64 orig_start;       /* logical start offset in block for orig */
 771         __u64 donor_start;      /* logical start offset in block for donor */
 772         __u64 len;              /* block length to be moved */
 773         __u64 moved_len;        /* moved block length */
 774 };
 775
 776 #define EXT4_EPOCH_BITS 2
 777 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 778 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 779
 780 /*
 781  * Extended fields will fit into an inode if the filesystem was formatted
 782  * with large inodes (-I 256 or larger) and there are not currently any EAs
 783  * consuming all of the available space. For new inodes we always reserve
 784  * enough space for the kernel's known extended fields, but for inodes
 785  * created with an old kernel this might not have been the case. None of
 786  * the extended inode fields is critical for correct filesystem operation.
 787  * This macro checks if a certain field fits in the inode. Note that
 788  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 789  */
 790 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 791         ((offsetof(typeof(*ext4_inode), field) +        \
 792           sizeof((ext4_inode)->field))                  \
 793         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 794             (einode)->i_extra_isize))                   \
 795
 796 /*
 797  * We use an encoding that preserves the times for extra epoch "00":
 798  *
 799  * extra  msb of                         adjust for signed
 800  * epoch  32-bit                         32-bit tv_sec to
 801  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 802  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 803  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 804  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 805  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 806  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 807  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 808  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 809  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 810  *
 811  * Note that previous versions of the kernel on 64-bit systems would
 812  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 813  * 1970.  e2fsck will correct this, assuming that it is run on the
 814  * affected filesystem before 2242.
 815  */
 816
 817 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 818 {
 819         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 820         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 821 }
 822
 823 static inline void ext4_decode_extra_time(struct timespec64 *time,
 824                                           __le32 extra)
 825 {
 826         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
 827
 828 #if 1
 829                 /* Handle legacy encoding of pre-1970 dates with epoch
 830                  * bits 1,1. (This backwards compatibility may be removed
 831                  * at the discretion of the ext4 developers.)
 832                  */
 833                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 834                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 835                         extra_bits = 0;
 836                 time->tv_sec += extra_bits << 32;
 837 #else
 838                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 839 #endif
 840         }
 841         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 842 }
 843
 844 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 845 do {                                                                            \
 846         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);                \
 847         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 848                 (raw_inode)->xtime ## _extra =                                  \
 849                                 ext4_encode_extra_time(&(inode)->xtime);        \
 850                 }                                                               \
 851 } while (0)
 852
 853 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 854 do {                                                                           \
 855         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 856                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 857         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 858                 (raw_inode)->xtime ## _extra =                                 \
 859                                 ext4_encode_extra_time(&(einode)->xtime);      \
 860 } while (0)
 861
 862 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 863 do {                                                                            \
 864         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 865         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 866                 ext4_decode_extra_time(&(inode)->xtime,                         \
 867                                        raw_inode->xtime ## _extra);             \
 868                 }                                                               \
 869         else                                                                    \
 870                 (inode)->xtime.tv_nsec = 0;                                     \
 871 } while (0)
 872
 873
 874 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 875 do {                                                                           \
 876         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 877                 (einode)->xtime.tv_sec =                                       \
 878                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 879         else                                                                   \
 880                 (einode)->xtime.tv_sec = 0;                                    \
 881         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 882                 ext4_decode_extra_time(&(einode)->xtime,                       \
 883                                        raw_inode->xtime ## _extra);            \
 884         else                                                                   \
 885                 (einode)->xtime.tv_nsec = 0;                                   \
 886 } while (0)
 887
 888 #define i_disk_version osd1.linux1.l_i_version
 889
 890 #if defined(__KERNEL__) || defined(__linux__)
 891 #define i_reserved1     osd1.linux1.l_i_reserved1
 892 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 893 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 894 #define i_uid_low       i_uid
 895 #define i_gid_low       i_gid
 896 #define i_uid_high      osd2.linux2.l_i_uid_high
 897 #define i_gid_high      osd2.linux2.l_i_gid_high
 898 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 899
 900 #elif defined(__GNU__)
 901
 902 #define i_translator    osd1.hurd1.h_i_translator
 903 #define i_uid_high      osd2.hurd2.h_i_uid_high
 904 #define i_gid_high      osd2.hurd2.h_i_gid_high
 905 #define i_author        osd2.hurd2.h_i_author
 906
 907 #elif defined(__masix__)
 908
 909 #define i_reserved1     osd1.masix1.m_i_reserved1
 910 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 911 #define i_reserved2     osd2.masix2.m_i_reserved2
 912
 913 #endif /* defined(__KERNEL__) || defined(__linux__) */
 914
 915 #include "extents_status.h"
 916
 917 /*
 918  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 919  *
 920  * These are needed to avoid lockdep false positives when we need to
 921  * allocate blocks to the quota inode during ext4_map_blocks(), while
 922  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 923  * do quota tracking for the quota inode, this avoids deadlock (as
 924  * well as infinite recursion, since it isn't turtles all the way
 925  * down...)
 926  *
 927  *  I_DATA_SEM_NORMAL - Used for most inodes
 928  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 929  *                        where the second inode has larger inode number
 930  *                        than the first
 931  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 932  */
 933 enum {
 934         I_DATA_SEM_NORMAL = 0,
 935         I_DATA_SEM_OTHER,
 936         I_DATA_SEM_QUOTA,
 937 };
 938
 939
 940 /*
 941  * fourth extended file system inode data in memory
 942  */
 943 struct ext4_inode_info {
 944         __le32  i_data[15];     /* unconverted */
 945         __u32   i_dtime;
 946         ext4_fsblk_t    i_file_acl;
 947
 948         /*
 949          * i_block_group is the number of the block group which contains
 950          * this file's inode.  Constant across the lifetime of the inode,
 951          * it is used for making block allocation decisions - we try to
 952          * place a file's data blocks near its inode block, and new inodes
 953          * near to their parent directory's inode.
 954          */
 955         ext4_group_t    i_block_group;
 956         ext4_lblk_t     i_dir_start_lookup;
 957 #if (BITS_PER_LONG < 64)
 958         unsigned long   i_state_flags;          /* Dynamic state flags */
 959 #endif
 960         unsigned long   i_flags;
 961
 962         /*
 963          * Extended attributes can be read independently of the main file
 964          * data. Taking i_mutex even when reading would cause contention
 965          * between readers of EAs and writers of regular file data, so
 966          * instead we synchronize on xattr_sem when reading or changing
 967          * EAs.
 968          */
 969         struct rw_semaphore xattr_sem;
 970
 971         struct list_head i_orphan;      /* unlinked but open inodes */
 972
 973         /*
 974          * i_disksize keeps track of what the inode size is ON DISK, not
 975          * in memory.  During truncate, i_size is set to the new size by
 976          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 977          * set i_disksize to 0 until the truncate is actually under way.
 978          *
 979          * The intent is that i_disksize always represents the blocks which
 980          * are used by this file.  This allows recovery to restart truncate
 981          * on orphans if we crash during truncate.  We actually write i_disksize
 982          * into the on-disk inode when writing inodes out, instead of i_size.
 983          *
 984          * The only time when i_disksize and i_size may be different is when
 985          * a truncate is in progress.  The only things which change i_disksize
 986          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 987          */
 988         loff_t  i_disksize;
 989
 990         /*
 991          * i_data_sem is for serialising ext4_truncate() against
 992          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 993          * data tree are chopped off during truncate. We can't do that in
 994          * ext4 because whenever we perform intermediate commits during
 995          * truncate, the inode and all the metadata blocks *must* be in a
 996          * consistent state which allows truncation of the orphans to restart
 997          * during recovery.  Hence we must fix the get_block-vs-truncate race
 998          * by other means, so we have i_data_sem.
 999          */
1000         struct rw_semaphore i_data_sem;
1001         /*
1002          * i_mmap_sem is for serializing page faults with truncate / punch hole
1003          * operations. We have to make sure that new page cannot be faulted in
1004          * a section of the inode that is being punched. We cannot easily use
1005          * i_data_sem for this since we need protection for the whole punch
1006          * operation and i_data_sem ranks below transaction start so we have
1007          * to occasionally drop it.
1008          */
1009         struct rw_semaphore i_mmap_sem;
1010         struct inode vfs_inode;
1011         struct jbd2_inode *jinode;
1012
1013         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1014
1015         /*
1016          * File creation time. Its function is same as that of
1017          * struct timespec64 i_{a,c,m}time in the generic inode.
1018          */
1019         struct timespec64 i_crtime;
1020
1021         /* mballoc */
1022         struct list_head i_prealloc_list;
1023         spinlock_t i_prealloc_lock;
1024
1025         /* extents status tree */
1026         struct ext4_es_tree i_es_tree;
1027         rwlock_t i_es_lock;
1028         struct list_head i_es_list;
1029         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1030         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1031         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1032                                            extents to shrink. Protected by
1033                                            i_es_lock  */
1034
1035         /* ialloc */
1036         ext4_group_t    i_last_alloc_group;
1037
1038         /* allocation reservation info for delalloc */
1039         /* In case of bigalloc, this refer to clusters rather than blocks */
1040         unsigned int i_reserved_data_blocks;
1041         ext4_lblk_t i_da_metadata_calc_last_lblock;
1042         int i_da_metadata_calc_len;
1043
1044         /* on-disk additional length */
1045         __u16 i_extra_isize;
1046
1047         /* Indicate the inline data space. */
1048         u16 i_inline_off;
1049         u16 i_inline_size;
1050
1051 #ifdef CONFIG_QUOTA
1052         /* quota space reservation, managed internally by quota code */
1053         qsize_t i_reserved_quota;
1054 #endif
1055
1056         /* Lock protecting lists below */
1057         spinlock_t i_completed_io_lock;
1058         /*
1059          * Completed IOs that need unwritten extents handling and have
1060          * transaction reserved
1061          */
1062         struct list_head i_rsv_conversion_list;
1063         struct work_struct i_rsv_conversion_work;
1064         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1065
1066         spinlock_t i_block_reservation_lock;
1067
1068         /*
1069          * Transactions that contain inode's metadata needed to complete
1070          * fsync and fdatasync, respectively.
1071          */
1072         tid_t i_sync_tid;
1073         tid_t i_datasync_tid;
1074
1075 #ifdef CONFIG_QUOTA
1076         struct dquot *i_dquot[MAXQUOTAS];
1077 #endif
1078
1079         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1080         __u32 i_csum_seed;
1081
1082         kprojid_t i_projid;
1083 };
1084
1085 /*
1086  * File system states
1087  */
1088 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1089 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1090 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1091
1092 /*
1093  * Misc. filesystem flags
1094  */
1095 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1096 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1097 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1098
1099 /*
1100  * Mount flags set via mount options or defaults
1101  */
1102 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1103 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1104 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1105 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1106 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1107 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1108 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1109 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1110 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1111 #ifdef CONFIG_FS_DAX
1112 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1113 #else
1114 #define EXT4_MOUNT_DAX                  0
1115 #endif
1116 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1117 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1118 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1119 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1120 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1121 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1122 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1123 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1124 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1125 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1126 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1127 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1128                                                  * enable enforcement for hidden
1129                                                  * quota files */
1130 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1131                                                   * enforcement for hidden quota
1132                                                   * files */
1133 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1134                                                   * enforcement */
1135 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1136 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1137 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1138 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1139 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1140 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1141 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1142 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1143 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1144
1145 /*
1146  * Mount flags set either automatically (could not be set by mount option)
1147  * based on per file system feature or property or in special cases such as
1148  * distinguishing between explicit mount option definition and default.
1149  */
1150 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1151                                                       specified delalloc */
1152 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1153                                                       size of blocksize * 8
1154                                                       blocks */
1155 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1156                                                       file systems */
1157
1158 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1159                                                 specified journal checksum */
1160
1161 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1162                                                 ~EXT4_MOUNT_##opt
1163 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1164                                                 EXT4_MOUNT_##opt
1165 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1166                                          EXT4_MOUNT_##opt)
1167
1168 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1169                                                 ~EXT4_MOUNT2_##opt
1170 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1171                                                 EXT4_MOUNT2_##opt
1172 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1173                                          EXT4_MOUNT2_##opt)
1174
1175 #define ext4_test_and_set_bit           __test_and_set_bit_le
1176 #define ext4_set_bit                    __set_bit_le
1177 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1178 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1179 #define ext4_clear_bit                  __clear_bit_le
1180 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1181 #define ext4_test_bit                   test_bit_le
1182 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1183 #define ext4_find_next_bit              find_next_bit_le
1184
1185 extern void ext4_set_bits(void *bm, int cur, int len);
1186
1187 /*
1188  * Maximal mount counts between two filesystem checks
1189  */
1190 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1191 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1192
1193 /*
1194  * Behaviour when detecting errors
1195  */
1196 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1197 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1198 #define EXT4_ERRORS_PANIC               3       /* Panic */
1199 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1200
1201 /* Metadata checksum algorithm codes */
1202 #define EXT4_CRC32C_CHKSUM              1
1203
1204 /*
1205  * Structure of the super block
1206  */
1207 struct ext4_super_block {
1208 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1209         __le32  s_blocks_count_lo;      /* Blocks count */
1210         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1211         __le32  s_free_blocks_count_lo; /* Free blocks count */
1212 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1213         __le32  s_first_data_block;     /* First Data Block */
1214         __le32  s_log_block_size;       /* Block size */
1215         __le32  s_log_cluster_size;     /* Allocation cluster size */
1216 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1217         __le32  s_clusters_per_group;   /* # Clusters per group */
1218         __le32  s_inodes_per_group;     /* # Inodes per group */
1219         __le32  s_mtime;                /* Mount time */
1220 /*30*/  __le32  s_wtime;                /* Write time */
1221         __le16  s_mnt_count;            /* Mount count */
1222         __le16  s_max_mnt_count;        /* Maximal mount count */
1223         __le16  s_magic;                /* Magic signature */
1224         __le16  s_state;                /* File system state */
1225         __le16  s_errors;               /* Behaviour when detecting errors */
1226         __le16  s_minor_rev_level;      /* minor revision level */
1227 /*40*/  __le32  s_lastcheck;            /* time of last check */
1228         __le32  s_checkinterval;        /* max. time between checks */
1229         __le32  s_creator_os;           /* OS */
1230         __le32  s_rev_level;            /* Revision level */
1231 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1232         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1233         /*
1234          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1235          *
1236          * Note: the difference between the compatible feature set and
1237          * the incompatible feature set is that if there is a bit set
1238          * in the incompatible feature set that the kernel doesn't
1239          * know about, it should refuse to mount the filesystem.
1240          *
1241          * e2fsck's requirements are more strict; if it doesn't know
1242          * about a feature in either the compatible or incompatible
1243          * feature set, it must abort and not try to meddle with
1244          * things it doesn't understand...
1245          */
1246         __le32  s_first_ino;            /* First non-reserved inode */
1247         __le16  s_inode_size;           /* size of inode structure */
1248         __le16  s_block_group_nr;       /* block group # of this superblock */
1249         __le32  s_feature_compat;       /* compatible feature set */
1250 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1251         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1252 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1253 /*78*/  char    s_volume_name[16];      /* volume name */
1254 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1255 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1256         /*
1257          * Performance hints.  Directory preallocation should only
1258          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1259          */
1260         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1261         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1262         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1263         /*
1264          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1265          */
1266 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1267 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1268         __le32  s_journal_dev;          /* device number of journal file */
1269         __le32  s_last_orphan;          /* start of list of inodes to delete */
1270         __le32  s_hash_seed[4];         /* HTREE hash seed */
1271         __u8    s_def_hash_version;     /* Default hash version to use */
1272         __u8    s_jnl_backup_type;
1273         __le16  s_desc_size;            /* size of group descriptor */
1274 /*100*/ __le32  s_default_mount_opts;
1275         __le32  s_first_meta_bg;        /* First metablock block group */
1276         __le32  s_mkfs_time;            /* When the filesystem was created */
1277         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1278         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1279 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1280         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1281         __le32  s_free_blocks_count_hi; /* Free blocks count */
1282         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1283         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1284         __le32  s_flags;                /* Miscellaneous flags */
1285         __le16  s_raid_stride;          /* RAID stride */
1286         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1287         __le64  s_mmp_block;            /* Block for multi-mount protection */
1288         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1289         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1290         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1291         __u8    s_encryption_level;     /* versioning level for encryption */
1292         __u8    s_reserved_pad;         /* Padding to next 32bits */
1293         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1294         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1295         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1296         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1297                                               snapshot's future use */
1298         __le32  s_snapshot_list;        /* inode number of the head of the
1299                                            on-disk snapshot list */
1300 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1301         __le32  s_error_count;          /* number of fs errors */
1302         __le32  s_first_error_time;     /* first time an error happened */
1303         __le32  s_first_error_ino;      /* inode involved in first error */
1304         __le64  s_first_error_block;    /* block involved of first error */
1305         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1306         __le32  s_first_error_line;     /* line number where error happened */
1307         __le32  s_last_error_time;      /* most recent time of an error */
1308         __le32  s_last_error_ino;       /* inode involved in last error */
1309         __le32  s_last_error_line;      /* line number where error happened */
1310         __le64  s_last_error_block;     /* block involved of last error */
1311         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1312 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1313         __u8    s_mount_opts[64];
1314         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1315         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1316         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1317         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1318         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1319         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1320         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1321         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1322         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1323         __u8    s_wtime_hi;
1324         __u8    s_mtime_hi;
1325         __u8    s_mkfs_time_hi;
1326         __u8    s_lastcheck_hi;
1327         __u8    s_first_error_time_hi;
1328         __u8    s_last_error_time_hi;
1329         __u8    s_pad[2];
1330         __le32  s_reserved[96];         /* Padding to the end of the block */
1331         __le32  s_checksum;             /* crc32c(superblock) */
1332 };
1333
1334 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1335
1336 #ifdef __KERNEL__
1337
1338 /*
1339  * run-time mount flags
1340  */
1341 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1342 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1343 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1344
1345 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1346 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1347                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1348 #else
1349 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1350 #endif
1351
1352 /* Number of quota types we support */
1353 #define EXT4_MAXQUOTAS 3
1354
1355 /*
1356  * fourth extended-fs super-block data in memory
1357  */
1358 struct ext4_sb_info {
1359         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1360         unsigned long s_inodes_per_block;/* Number of inodes per block */
1361         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1362         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1363         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1364         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1365         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1366         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1367         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1368         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1369         unsigned long s_overhead;  /* # of fs overhead clusters */
1370         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1371         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1372         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1373         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1374         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1375         struct buffer_head * __rcu *s_group_desc;
1376         unsigned int s_mount_opt;
1377         unsigned int s_mount_opt2;
1378         unsigned int s_mount_flags;
1379         unsigned int s_def_mount_opt;
1380         ext4_fsblk_t s_sb_block;
1381         atomic64_t s_resv_clusters;
1382         kuid_t s_resuid;
1383         kgid_t s_resgid;
1384         unsigned short s_mount_state;
1385         unsigned short s_pad;
1386         int s_addr_per_block_bits;
1387         int s_desc_per_block_bits;
1388         int s_inode_size;
1389         int s_first_ino;
1390         unsigned int s_inode_readahead_blks;
1391         unsigned int s_inode_goal;
1392         u32 s_hash_seed[4];
1393         int s_def_hash_version;
1394         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1395         struct percpu_counter s_freeclusters_counter;
1396         struct percpu_counter s_freeinodes_counter;
1397         struct percpu_counter s_dirs_counter;
1398         struct percpu_counter s_dirtyclusters_counter;
1399         struct blockgroup_lock *s_blockgroup_lock;
1400         struct proc_dir_entry *s_proc;
1401         struct kobject s_kobj;
1402         struct completion s_kobj_unregister;
1403         struct super_block *s_sb;
1404
1405         /* Journaling */
1406         struct journal_s *s_journal;
1407         struct list_head s_orphan;
1408         struct mutex s_orphan_lock;
1409         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1410         unsigned long s_commit_interval;
1411         u32 s_max_batch_time;
1412         u32 s_min_batch_time;
1413         struct block_device *journal_bdev;
1414 #ifdef CONFIG_QUOTA
1415         /* Names of quota files with journalled quota */
1416         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1417         int s_jquota_fmt;                       /* Format of quota to use */
1418 #endif
1419         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1420         struct ext4_system_blocks __rcu *system_blks;
1421
1422 #ifdef EXTENTS_STATS
1423         /* ext4 extents stats */
1424         unsigned long s_ext_min;
1425         unsigned long s_ext_max;
1426         unsigned long s_depth_max;
1427         spinlock_t s_ext_stats_lock;
1428         unsigned long s_ext_blocks;
1429         unsigned long s_ext_extents;
1430 #endif
1431
1432         /* for buddy allocator */
1433         struct ext4_group_info ** __rcu *s_group_info;
1434         struct inode *s_buddy_cache;
1435         spinlock_t s_md_lock;
1436         unsigned short *s_mb_offsets;
1437         unsigned int *s_mb_maxs;
1438         unsigned int s_group_info_size;
1439         unsigned int s_mb_free_pending;
1440         struct list_head s_freed_data_list;     /* List of blocks to be freed
1441                                                    after commit completed */
1442
1443         /* tunables */
1444         unsigned long s_stripe;
1445         unsigned int s_mb_stream_request;
1446         unsigned int s_mb_max_to_scan;
1447         unsigned int s_mb_min_to_scan;
1448         unsigned int s_mb_stats;
1449         unsigned int s_mb_order2_reqs;
1450         unsigned int s_mb_group_prealloc;
1451         unsigned int s_max_dir_size_kb;
1452         /* where last allocation was done - for stream allocation */
1453         unsigned long s_mb_last_group;
1454         unsigned long s_mb_last_start;
1455
1456         /* stats for buddy allocator */
1457         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1458         atomic_t s_bal_success; /* we found long enough chunks */
1459         atomic_t s_bal_allocated;       /* in blocks */
1460         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1461         atomic_t s_bal_goals;   /* goal hits */
1462         atomic_t s_bal_breaks;  /* too long searches */
1463         atomic_t s_bal_2orders; /* 2^order hits */
1464         spinlock_t s_bal_lock;
1465         unsigned long s_mb_buddies_generated;
1466         unsigned long long s_mb_generation_time;
1467         atomic_t s_mb_lost_chunks;
1468         atomic_t s_mb_preallocated;
1469         atomic_t s_mb_discarded;
1470         atomic_t s_lock_busy;
1471
1472         /* locality groups */
1473         struct ext4_locality_group __percpu *s_locality_groups;
1474
1475         /* for write statistics */
1476         unsigned long s_sectors_written_start;
1477         u64 s_kbytes_written;
1478
1479         /* the size of zero-out chunk */
1480         unsigned int s_extent_max_zeroout_kb;
1481
1482         unsigned int s_log_groups_per_flex;
1483         struct flex_groups * __rcu *s_flex_groups;
1484         ext4_group_t s_flex_groups_allocated;
1485
1486         /* workqueue for reserved extent conversions (buffered io) */
1487         struct workqueue_struct *rsv_conversion_wq;
1488
1489         /* timer for periodic error stats printing */
1490         struct timer_list s_err_report;
1491
1492         /* Lazy inode table initialization info */
1493         struct ext4_li_request *s_li_request;
1494         /* Wait multiplier for lazy initialization thread */
1495         unsigned int s_li_wait_mult;
1496
1497         /* Kernel thread for multiple mount protection */
1498         struct task_struct *s_mmp_tsk;
1499
1500         /* record the last minlen when FITRIM is called. */
1501         atomic_t s_last_trim_minblks;
1502
1503         /* Reference to checksum algorithm driver via cryptoapi */
1504         struct crypto_shash *s_chksum_driver;
1505
1506         /* Precomputed FS UUID checksum for seeding other checksums */
1507         __u32 s_csum_seed;
1508
1509         /* Reclaim extents from extent status tree */
1510         struct shrinker s_es_shrinker;
1511         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1512         long s_es_nr_inode;
1513         struct ext4_es_stats s_es_stats;
1514         struct mb_cache *s_ea_block_cache;
1515         struct mb_cache *s_ea_inode_cache;
1516         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1517
1518         /* Ratelimit ext4 messages. */
1519         struct ratelimit_state s_err_ratelimit_state;
1520         struct ratelimit_state s_warning_ratelimit_state;
1521         struct ratelimit_state s_msg_ratelimit_state;
1522
1523         /*
1524          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1525          * or EXTENTS flag.
1526          */
1527         struct percpu_rw_semaphore s_writepages_rwsem;
1528         struct dax_device *s_daxdev;
1529 };
1530
1531 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1532 {
1533         return sb->s_fs_info;
1534 }
1535 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1536 {
1537         return container_of(inode, struct ext4_inode_info, vfs_inode);
1538 }
1539
1540 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1541 {
1542         return ino == EXT4_ROOT_INO ||
1543                 (ino >= EXT4_FIRST_INO(sb) &&
1544                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1545 }
1546
1547 /*
1548  * Returns: sbi->field[index]
1549  * Used to access an array element from the following sbi fields which require
1550  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1551  * - s_group_desc
1552  * - s_group_info
1553  * - s_flex_group
1554  */
1555 #define sbi_array_rcu_deref(sbi, field, index)                             \
1556 ({                                                                         \
1557         typeof(*((sbi)->field)) _v;                                        \
1558         rcu_read_lock();                                                   \
1559         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1560         rcu_read_unlock();                                                 \
1561         _v;                                                                \
1562 })
1563
1564 /*
1565  * Inode dynamic state flags
1566  */
1567 enum {
1568         EXT4_STATE_JDATA,               /* journaled data exists */
1569         EXT4_STATE_NEW,                 /* inode is newly created */
1570         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1571         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1572         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1573         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1574         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1575         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1576         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1577         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1578         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1579 };
1580
1581 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1582 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1583 {                                                                       \
1584         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1585 }                                                                       \
1586 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1587 {                                                                       \
1588         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1589 }                                                                       \
1590 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1591 {                                                                       \
1592         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1593 }
1594
1595 /* Add these declarations here only so that these functions can be
1596  * found by name.  Otherwise, they are very hard to locate. */
1597 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1598 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1599 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1600 EXT4_INODE_BIT_FNS(flag, flags, 0)
1601
1602 /* Add these declarations here only so that these functions can be
1603  * found by name.  Otherwise, they are very hard to locate. */
1604 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1605 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1606 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1607 #if (BITS_PER_LONG < 64)
1608 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1609
1610 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1611 {
1612         (ei)->i_state_flags = 0;
1613 }
1614 #else
1615 EXT4_INODE_BIT_FNS(state, flags, 32)
1616
1617 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1618 {
1619         /* We depend on the fact that callers will set i_flags */
1620 }
1621 #endif
1622 #else
1623 /* Assume that user mode programs are passing in an ext4fs superblock, not
1624  * a kernel struct super_block.  This will allow us to call the feature-test
1625  * macros from user land. */
1626 #define EXT4_SB(sb)     (sb)
1627 #endif
1628
1629 /*
1630  * Returns true if the inode is inode is encrypted
1631  */
1632 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1633
1634 /*
1635  * Codes for operating systems
1636  */
1637 #define EXT4_OS_LINUX           0
1638 #define EXT4_OS_HURD            1
1639 #define EXT4_OS_MASIX           2
1640 #define EXT4_OS_FREEBSD         3
1641 #define EXT4_OS_LITES           4
1642
1643 /*
1644  * Revision levels
1645  */
1646 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1647 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1648
1649 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1650 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1651
1652 #define EXT4_GOOD_OLD_INODE_SIZE 128
1653
1654 /*
1655  * Feature set definitions
1656  */
1657
1658 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1659 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1660 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1661 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1662 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1663 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1664 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1665
1666 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1667 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1668 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1669 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1670 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1671 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1672 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1673 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1674 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1675 /*
1676  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1677  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1678  * all other data structures' checksums.  However, the METADATA_CSUM and
1679  * GDT_CSUM bits are mutually exclusive.
1680  */
1681 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1682 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1683 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1684
1685 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1686 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1687 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1688 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1689 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1690 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1691 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1692 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1693 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1694 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1695 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1696 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1697 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1698 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1699 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1700
1701 extern void ext4_update_dynamic_rev(struct super_block *sb);
1702
1703 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1704 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1705 { \
1706         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1707                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1708 } \
1709 static inline void ext4_set_feature_##name(struct super_block *sb) \
1710 { \
1711         ext4_update_dynamic_rev(sb); \
1712         EXT4_SB(sb)->s_es->s_feature_compat |= \
1713                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1714 } \
1715 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1716 { \
1717         EXT4_SB(sb)->s_es->s_feature_compat &= \
1718                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1719 }
1720
1721 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1722 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1723 { \
1724         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1725                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1726 } \
1727 static inline void ext4_set_feature_##name(struct super_block *sb) \
1728 { \
1729         ext4_update_dynamic_rev(sb); \
1730         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1731                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1732 } \
1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1734 { \
1735         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1736                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1737 }
1738
1739 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1740 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1741 { \
1742         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1743                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1744 } \
1745 static inline void ext4_set_feature_##name(struct super_block *sb) \
1746 { \
1747         ext4_update_dynamic_rev(sb); \
1748         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1749                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1750 } \
1751 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1752 { \
1753         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1754                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1755 }
1756
1757 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1758 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1759 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1760 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1761 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1762 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1763 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1764
1765 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1766 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1767 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1768 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1769 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1770 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1771 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1772 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1773 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1774 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1775 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1776 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1777
1778 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1779 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1780 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1781 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1782 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1783 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1784 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1785 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1786 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1787 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1788 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1789 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1790 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1791 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1792 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1793
1794 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1795 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1796                                          EXT4_FEATURE_INCOMPAT_META_BG)
1797 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1798                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1799                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1800
1801 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1802 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1803                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1804                                          EXT4_FEATURE_INCOMPAT_META_BG)
1805 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1806                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1807                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1808
1809 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1810 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1811                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1812                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1813                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1814                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1815                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1816                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1817                                          EXT4_FEATURE_INCOMPAT_MMP | \
1818                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1819                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1820                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1821                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1822 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1823                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1824                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1825                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1826                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1827                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1828                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1829                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1830                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1831                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1832                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1833
1834 #define EXTN_FEATURE_FUNCS(ver) \
1835 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1836 { \
1837         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1838                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1839 } \
1840 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1841 { \
1842         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1843                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1844 } \
1845 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1846 { \
1847         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1848                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1849 }
1850
1851 EXTN_FEATURE_FUNCS(2)
1852 EXTN_FEATURE_FUNCS(3)
1853 EXTN_FEATURE_FUNCS(4)
1854
1855 static inline bool ext4_has_compat_features(struct super_block *sb)
1856 {
1857         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1858 }
1859 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1860 {
1861         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1862 }
1863 static inline bool ext4_has_incompat_features(struct super_block *sb)
1864 {
1865         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1866 }
1867
1868 /*
1869  * Superblock flags
1870  */
1871 #define EXT4_FLAGS_RESIZING     0
1872 #define EXT4_FLAGS_SHUTDOWN     1
1873
1874 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1875 {
1876         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1877 }
1878
1879
1880 /*
1881  * Default values for user and/or group using reserved blocks
1882  */
1883 #define EXT4_DEF_RESUID         0
1884 #define EXT4_DEF_RESGID         0
1885
1886 /*
1887  * Default project ID
1888  */
1889 #define EXT4_DEF_PROJID         0
1890
1891 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1892
1893 /*
1894  * Default mount options
1895  */
1896 #define EXT4_DEFM_DEBUG         0x0001
1897 #define EXT4_DEFM_BSDGROUPS     0x0002
1898 #define EXT4_DEFM_XATTR_USER    0x0004
1899 #define EXT4_DEFM_ACL           0x0008
1900 #define EXT4_DEFM_UID16         0x0010
1901 #define EXT4_DEFM_JMODE         0x0060
1902 #define EXT4_DEFM_JMODE_DATA    0x0020
1903 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1904 #define EXT4_DEFM_JMODE_WBACK   0x0060
1905 #define EXT4_DEFM_NOBARRIER     0x0100
1906 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1907 #define EXT4_DEFM_DISCARD       0x0400
1908 #define EXT4_DEFM_NODELALLOC    0x0800
1909
1910 /*
1911  * Default journal batch times
1912  */
1913 #define EXT4_DEF_MIN_BATCH_TIME 0
1914 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1915
1916 /*
1917  * Minimum number of groups in a flexgroup before we separate out
1918  * directories into the first block group of a flexgroup
1919  */
1920 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1921
1922 /*
1923  * Structure of a directory entry
1924  */
1925 #define EXT4_NAME_LEN 255
1926
1927 struct ext4_dir_entry {
1928         __le32  inode;                  /* Inode number */
1929         __le16  rec_len;                /* Directory entry length */
1930         __le16  name_len;               /* Name length */
1931         char    name[EXT4_NAME_LEN];    /* File name */
1932 };
1933
1934 /*
1935  * The new version of the directory entry.  Since EXT4 structures are
1936  * stored in intel byte order, and the name_len field could never be
1937  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1938  * file_type field.
1939  */
1940 struct ext4_dir_entry_2 {
1941         __le32  inode;                  /* Inode number */
1942         __le16  rec_len;                /* Directory entry length */
1943         __u8    name_len;               /* Name length */
1944         __u8    file_type;
1945         char    name[EXT4_NAME_LEN];    /* File name */
1946 };
1947
1948 /*
1949  * This is a bogus directory entry at the end of each leaf block that
1950  * records checksums.
1951  */
1952 struct ext4_dir_entry_tail {
1953         __le32  det_reserved_zero1;     /* Pretend to be unused */
1954         __le16  det_rec_len;            /* 12 */
1955         __u8    det_reserved_zero2;     /* Zero name length */
1956         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1957         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1958 };
1959
1960 #define EXT4_DIRENT_TAIL(block, blocksize) \
1961         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1962                                         ((blocksize) - \
1963                                          sizeof(struct ext4_dir_entry_tail))))
1964
1965 /*
1966  * Ext4 directory file types.  Only the low 3 bits are used.  The
1967  * other bits are reserved for now.
1968  */
1969 #define EXT4_FT_UNKNOWN         0
1970 #define EXT4_FT_REG_FILE        1
1971 #define EXT4_FT_DIR             2
1972 #define EXT4_FT_CHRDEV          3
1973 #define EXT4_FT_BLKDEV          4
1974 #define EXT4_FT_FIFO            5
1975 #define EXT4_FT_SOCK            6
1976 #define EXT4_FT_SYMLINK         7
1977
1978 #define EXT4_FT_MAX             8
1979
1980 #define EXT4_FT_DIR_CSUM        0xDE
1981
1982 /*
1983  * EXT4_DIR_PAD defines the directory entries boundaries
1984  *
1985  * NOTE: It must be a multiple of 4
1986  */
1987 #define EXT4_DIR_PAD                    4
1988 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1989 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1990                                          ~EXT4_DIR_ROUND)
1991 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1992
1993 /*
1994  * If we ever get support for fs block sizes > page_size, we'll need
1995  * to remove the #if statements in the next two functions...
1996  */
1997 static inline unsigned int
1998 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1999 {
2000         unsigned len = le16_to_cpu(dlen);
2001
2002 #if (PAGE_SIZE >= 65536)
2003         if (len == EXT4_MAX_REC_LEN || len == 0)
2004                 return blocksize;
2005         return (len & 65532) | ((len & 3) << 16);
2006 #else
2007         return len;
2008 #endif
2009 }
2010
2011 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2012 {
2013         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2014                 BUG();
2015 #if (PAGE_SIZE >= 65536)
2016         if (len < 65536)
2017                 return cpu_to_le16(len);
2018         if (len == blocksize) {
2019                 if (blocksize == 65536)
2020                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2021                 else
2022                         return cpu_to_le16(0);
2023         }
2024         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2025 #else
2026         return cpu_to_le16(len);
2027 #endif
2028 }
2029
2030 /*
2031  * Hash Tree Directory indexing
2032  * (c) Daniel Phillips, 2001
2033  */
2034
2035 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2036                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2037 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2038                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2039 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2040
2041 /* Legal values for the dx_root hash_version field: */
2042
2043 #define DX_HASH_LEGACY                  0
2044 #define DX_HASH_HALF_MD4                1
2045 #define DX_HASH_TEA                     2
2046 #define DX_HASH_LEGACY_UNSIGNED         3
2047 #define DX_HASH_HALF_MD4_UNSIGNED       4
2048 #define DX_HASH_TEA_UNSIGNED            5
2049
2050 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2051                               const void *address, unsigned int length)
2052 {
2053         struct {
2054                 struct shash_desc shash;
2055                 char ctx[4];
2056         } desc;
2057
2058         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2059
2060         desc.shash.tfm = sbi->s_chksum_driver;
2061         desc.shash.flags = 0;
2062         *(u32 *)desc.ctx = crc;
2063
2064         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2065
2066         return *(u32 *)desc.ctx;
2067 }
2068
2069 #ifdef __KERNEL__
2070
2071 /* hash info structure used by the directory hash */
2072 struct dx_hash_info
2073 {
2074         u32             hash;
2075         u32             minor_hash;
2076         int             hash_version;
2077         u32             *seed;
2078 };
2079
2080
2081 /* 32 and 64 bit signed EOF for dx directories */
2082 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2083 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2084
2085
2086 /*
2087  * Control parameters used by ext4_htree_next_block
2088  */
2089 #define HASH_NB_ALWAYS          1
2090
2091 struct ext4_filename {
2092         const struct qstr *usr_fname;
2093         struct fscrypt_str disk_name;
2094         struct dx_hash_info hinfo;
2095 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2096         struct fscrypt_str crypto_buf;
2097 #endif
2098 };
2099
2100 #define fname_name(p) ((p)->disk_name.name)
2101 #define fname_len(p)  ((p)->disk_name.len)
2102
2103 /*
2104  * Describe an inode's exact location on disk and in memory
2105  */
2106 struct ext4_iloc
2107 {
2108         struct buffer_head *bh;
2109         unsigned long offset;
2110         ext4_group_t block_group;
2111 };
2112
2113 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2114 {
2115         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2116 }
2117
2118 static inline bool ext4_is_quota_file(struct inode *inode)
2119 {
2120         return IS_NOQUOTA(inode) &&
2121                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2122 }
2123
2124 /*
2125  * This structure is stuffed into the struct file's private_data field
2126  * for directories.  It is where we put information so that we can do
2127  * readdir operations in hash tree order.
2128  */
2129 struct dir_private_info {
2130         struct rb_root  root;
2131         struct rb_node  *curr_node;
2132         struct fname    *extra_fname;
2133         loff_t          last_pos;
2134         __u32           curr_hash;
2135         __u32           curr_minor_hash;
2136         __u32           next_hash;
2137 };
2138
2139 /* calculate the first block number of the group */
2140 static inline ext4_fsblk_t
2141 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2142 {
2143         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2144                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2145 }
2146
2147 /*
2148  * Special error return code only used by dx_probe() and its callers.
2149  */
2150 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2151
2152 /* htree levels for ext4 */
2153 #define EXT4_HTREE_LEVEL_COMPAT 2
2154 #define EXT4_HTREE_LEVEL        3
2155
2156 static inline int ext4_dir_htree_level(struct super_block *sb)
2157 {
2158         return ext4_has_feature_largedir(sb) ?
2159                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2160 }
2161
2162 /*
2163  * Timeout and state flag for lazy initialization inode thread.
2164  */
2165 #define EXT4_DEF_LI_WAIT_MULT                   10
2166 #define EXT4_DEF_LI_MAX_START_DELAY             5
2167 #define EXT4_LAZYINIT_QUIT                      0x0001
2168 #define EXT4_LAZYINIT_RUNNING                   0x0002
2169
2170 /*
2171  * Lazy inode table initialization info
2172  */
2173 struct ext4_lazy_init {
2174         unsigned long           li_state;
2175         struct list_head        li_request_list;
2176         struct mutex            li_list_mtx;
2177 };
2178
2179 struct ext4_li_request {
2180         struct super_block      *lr_super;
2181         struct ext4_sb_info     *lr_sbi;
2182         ext4_group_t            lr_next_group;
2183         struct list_head        lr_request;
2184         unsigned long           lr_next_sched;
2185         unsigned long           lr_timeout;
2186 };
2187
2188 struct ext4_features {
2189         struct kobject f_kobj;
2190         struct completion f_kobj_unregister;
2191 };
2192
2193 /*
2194  * This structure will be used for multiple mount protection. It will be
2195  * written into the block number saved in the s_mmp_block field in the
2196  * superblock. Programs that check MMP should assume that if
2197  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2198  * to use the filesystem, regardless of how old the timestamp is.
2199  */
2200 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2201 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2202 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2203 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2204
2205 struct mmp_struct {
2206         __le32  mmp_magic;              /* Magic number for MMP */
2207         __le32  mmp_seq;                /* Sequence no. updated periodically */
2208
2209         /*
2210          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2211          * purposes and do not affect the correctness of the algorithm
2212          */
2213         __le64  mmp_time;               /* Time last updated */
2214         char    mmp_nodename[64];       /* Node which last updated MMP block */
2215         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2216
2217         /*
2218          * mmp_check_interval is used to verify if the MMP block has been
2219          * updated on the block device. The value is updated based on the
2220          * maximum time to write the MMP block during an update cycle.
2221          */
2222         __le16  mmp_check_interval;
2223
2224         __le16  mmp_pad1;
2225         __le32  mmp_pad2[226];
2226         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2227 };
2228
2229 /* arguments passed to the mmp thread */
2230 struct mmpd_data {
2231         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2232         struct super_block *sb;  /* super block of the fs */
2233 };
2234
2235 /*
2236  * Check interval multiplier
2237  * The MMP block is written every update interval and initially checked every
2238  * update interval x the multiplier (the value is then adapted based on the
2239  * write latency). The reason is that writes can be delayed under load and we
2240  * don't want readers to incorrectly assume that the filesystem is no longer
2241  * in use.
2242  */
2243 #define EXT4_MMP_CHECK_MULT             2UL
2244
2245 /*
2246  * Minimum interval for MMP checking in seconds.
2247  */
2248 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2249
2250 /*
2251  * Maximum interval for MMP checking in seconds.
2252  */
2253 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2254
2255 /*
2256  * Function prototypes
2257  */
2258
2259 /*
2260  * Ok, these declarations are also in <linux/kernel.h> but none of the
2261  * ext4 source programs needs to include it so they are duplicated here.
2262  */
2263 # define NORET_TYPE     /**/
2264 # define ATTRIB_NORET   __attribute__((noreturn))
2265 # define NORET_AND      noreturn,
2266
2267 /* bitmap.c */
2268 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2269 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2270                                 struct ext4_group_desc *gdp,
2271                                 struct buffer_head *bh, int sz);
2272 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2273                                   struct ext4_group_desc *gdp,
2274                                   struct buffer_head *bh, int sz);
2275 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2276                                 struct ext4_group_desc *gdp,
2277                                 struct buffer_head *bh);
2278 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2279                                   struct ext4_group_desc *gdp,
2280                                   struct buffer_head *bh);
2281
2282 /* balloc.c */
2283 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2284                                          ext4_fsblk_t blocknr,
2285                                          ext4_group_t *blockgrpp,
2286                                          ext4_grpblk_t *offsetp);
2287 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2288                                           ext4_fsblk_t block);
2289
2290 extern unsigned int ext4_block_group(struct super_block *sb,
2291                         ext4_fsblk_t blocknr);
2292 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2293                         ext4_fsblk_t blocknr);
2294 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2295 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2296                         ext4_group_t group);
2297 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2298                                          ext4_fsblk_t goal,
2299                                          unsigned int flags,
2300                                          unsigned long *count,
2301                                          int *errp);
2302 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2303                                     s64 nclusters, unsigned int flags);
2304 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2305 extern void ext4_check_blocks_bitmap(struct super_block *);
2306 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2307                                                     ext4_group_t block_group,
2308                                                     struct buffer_head ** bh);
2309 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2310
2311 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2312                                                 ext4_group_t block_group);
2313 extern int ext4_wait_block_bitmap(struct super_block *sb,
2314                                   ext4_group_t block_group,
2315                                   struct buffer_head *bh);
2316 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2317                                                   ext4_group_t block_group);
2318 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2319                                               ext4_group_t block_group,
2320                                               struct ext4_group_desc *gdp);
2321 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2322
2323 static inline bool ext4_encrypted_inode(struct inode *inode)
2324 {
2325         return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
2326 }
2327
2328 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2329 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2330                                                 const struct fscrypt_name *src)
2331 {
2332         memset(dst, 0, sizeof(*dst));
2333
2334         dst->usr_fname = src->usr_fname;
2335         dst->disk_name = src->disk_name;
2336         dst->hinfo.hash = src->hash;
2337         dst->hinfo.minor_hash = src->minor_hash;
2338         dst->crypto_buf = src->crypto_buf;
2339 }
2340
2341 static inline int ext4_fname_setup_filename(struct inode *dir,
2342                                             const struct qstr *iname,
2343                                             int lookup,
2344                                             struct ext4_filename *fname)
2345 {
2346         struct fscrypt_name name;
2347         int err;
2348
2349         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2350         if (err)
2351                 return err;
2352
2353         ext4_fname_from_fscrypt_name(fname, &name);
2354         return 0;
2355 }
2356
2357 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2358                                             struct dentry *dentry,
2359                                             struct ext4_filename *fname)
2360 {
2361         struct fscrypt_name name;
2362         int err;
2363
2364         err = fscrypt_prepare_lookup(dir, dentry, &name);
2365         if (err)
2366                 return err;
2367
2368         ext4_fname_from_fscrypt_name(fname, &name);
2369         return 0;
2370 }
2371
2372 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2373 {
2374         struct fscrypt_name name;
2375
2376         name.crypto_buf = fname->crypto_buf;
2377         fscrypt_free_filename(&name);
2378
2379         fname->crypto_buf.name = NULL;
2380         fname->usr_fname = NULL;
2381         fname->disk_name.name = NULL;
2382 }
2383 #else /* !CONFIG_EXT4_FS_ENCRYPTION */
2384 static inline int ext4_fname_setup_filename(struct inode *dir,
2385                                             const struct qstr *iname,
2386                                             int lookup,
2387                                             struct ext4_filename *fname)
2388 {
2389         fname->usr_fname = iname;
2390         fname->disk_name.name = (unsigned char *) iname->name;
2391         fname->disk_name.len = iname->len;
2392         return 0;
2393 }
2394
2395 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2396                                             struct dentry *dentry,
2397                                             struct ext4_filename *fname)
2398 {
2399         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2400 }
2401
2402 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2403 #endif /* !CONFIG_EXT4_FS_ENCRYPTION */
2404
2405 /* dir.c */
2406 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2407                                   struct file *,
2408                                   struct ext4_dir_entry_2 *,
2409                                   struct buffer_head *, char *, int,
2410                                   unsigned int);
2411 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2412         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2413                                         (de), (bh), (buf), (size), (offset)))
2414 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2415                                 __u32 minor_hash,
2416                                 struct ext4_dir_entry_2 *dirent,
2417                                 struct fscrypt_str *ent_name);
2418 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2419 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2420                              struct buffer_head *bh,
2421                              void *buf, int buf_size,
2422                              struct ext4_filename *fname,
2423                              struct ext4_dir_entry_2 **dest_de);
2424 void ext4_insert_dentry(struct inode *inode,
2425                         struct ext4_dir_entry_2 *de,
2426                         int buf_size,
2427                         struct ext4_filename *fname);
2428 static inline void ext4_update_dx_flag(struct inode *inode)
2429 {
2430         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2431             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2432                 /* ext4_iget() should have caught this... */
2433                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2434                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2435         }
2436 }
2437 static const unsigned char ext4_filetype_table[] = {
2438         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2439 };
2440
2441 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2442 {
2443         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2444                 return DT_UNKNOWN;
2445
2446         return ext4_filetype_table[filetype];
2447 }
2448 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2449                              void *buf, int buf_size);
2450
2451 /* fsync.c */
2452 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2453
2454 /* hash.c */
2455 extern int ext4fs_dirhash(const char *name, int len, struct
2456                           dx_hash_info *hinfo);
2457
2458 /* ialloc.c */
2459 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2460                                       const struct qstr *qstr, __u32 goal,
2461                                       uid_t *owner, __u32 i_flags,
2462                                       int handle_type, unsigned int line_no,
2463                                       int nblocks);
2464
2465 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2466         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2467                          i_flags, 0, 0, 0)
2468 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2469                                     type, nblocks)                  \
2470         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2471                          0, (type), __LINE__, (nblocks))
2472
2473
2474 extern void ext4_free_inode(handle_t *, struct inode *);
2475 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2476 extern unsigned long ext4_count_free_inodes(struct super_block *);
2477 extern unsigned long ext4_count_dirs(struct super_block *);
2478 extern void ext4_check_inodes_bitmap(struct super_block *);
2479 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2480 extern int ext4_init_inode_table(struct super_block *sb,
2481                                  ext4_group_t group, int barrier);
2482 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2483
2484 /* mballoc.c */
2485 extern const struct seq_operations ext4_mb_seq_groups_ops;
2486 extern long ext4_mb_stats;
2487 extern long ext4_mb_max_to_scan;
2488 extern int ext4_mb_init(struct super_block *);
2489 extern int ext4_mb_release(struct super_block *);
2490 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2491                                 struct ext4_allocation_request *, int *);
2492 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2493 extern void ext4_discard_preallocations(struct inode *);
2494 extern int __init ext4_init_mballoc(void);
2495 extern void ext4_exit_mballoc(void);
2496 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2497                              struct buffer_head *bh, ext4_fsblk_t block,
2498                              unsigned long count, int flags);
2499 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2500                                    ext4_group_t ngroups);
2501 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2502                 ext4_group_t i, struct ext4_group_desc *desc);
2503 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2504                                 ext4_fsblk_t block, unsigned long count);
2505 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2506 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2507
2508 /* inode.c */
2509 int ext4_inode_is_fast_symlink(struct inode *inode);
2510 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2511 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2512 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2513                      bool wait, struct buffer_head **bhs);
2514 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2515                              struct buffer_head *bh_result, int create);
2516 int ext4_get_block(struct inode *inode, sector_t iblock,
2517                    struct buffer_head *bh_result, int create);
2518 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2519                        struct buffer_head *bh_result, int create);
2520 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2521                            struct buffer_head *bh, int create);
2522 int ext4_walk_page_buffers(handle_t *handle,
2523                            struct buffer_head *head,
2524                            unsigned from,
2525                            unsigned to,
2526                            int *partial,
2527                            int (*fn)(handle_t *handle,
2528                                      struct buffer_head *bh));
2529 int do_journal_get_write_access(handle_t *handle,
2530                                 struct buffer_head *bh);
2531 #define FALL_BACK_TO_NONDELALLOC 1
2532 #define CONVERT_INLINE_DATA      2
2533
2534 typedef enum {
2535         EXT4_IGET_NORMAL =      0,
2536         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2537         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2538 } ext4_iget_flags;
2539
2540 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2541                                  ext4_iget_flags flags, const char *function,
2542                                  unsigned int line);
2543
2544 #define ext4_iget(sb, ino, flags) \
2545         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2546
2547 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2548 extern int  ext4_setattr(struct dentry *, struct iattr *);
2549 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2550 extern void ext4_evict_inode(struct inode *);
2551 extern void ext4_clear_inode(struct inode *);
2552 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2553 extern int  ext4_sync_inode(handle_t *, struct inode *);
2554 extern void ext4_dirty_inode(struct inode *, int);
2555 extern int ext4_change_inode_journal_flag(struct inode *, int);
2556 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2557 extern int ext4_inode_attach_jinode(struct inode *inode);
2558 extern int ext4_can_truncate(struct inode *inode);
2559 extern int ext4_truncate(struct inode *);
2560 extern int ext4_break_layouts(struct inode *);
2561 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2562 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2563 extern void ext4_set_inode_flags(struct inode *);
2564 extern int ext4_alloc_da_blocks(struct inode *inode);
2565 extern void ext4_set_aops(struct inode *inode);
2566 extern int ext4_writepage_trans_blocks(struct inode *);
2567 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2568 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2569                              loff_t lstart, loff_t lend);
2570 extern int ext4_page_mkwrite(struct vm_fault *vmf);
2571 extern int ext4_filemap_fault(struct vm_fault *vmf);
2572 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2573 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2574 extern void ext4_da_update_reserve_space(struct inode *inode,
2575                                         int used, int quota_claim);
2576 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2577                               ext4_fsblk_t pblk, ext4_lblk_t len);
2578
2579 /* indirect.c */
2580 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2581                                 struct ext4_map_blocks *map, int flags);
2582 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2583 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2584 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2585 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2586                                  ext4_lblk_t start, ext4_lblk_t end);
2587
2588 /* ioctl.c */
2589 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2590 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2591
2592 /* migrate.c */
2593 extern int ext4_ext_migrate(struct inode *);
2594 extern int ext4_ind_migrate(struct inode *inode);
2595
2596 /* namei.c */
2597 extern int ext4_dirent_csum_verify(struct inode *inode,
2598                                    struct ext4_dir_entry *dirent);
2599 extern int ext4_orphan_add(handle_t *, struct inode *);
2600 extern int ext4_orphan_del(handle_t *, struct inode *);
2601 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2602                                 __u32 start_minor_hash, __u32 *next_hash);
2603 extern int ext4_search_dir(struct buffer_head *bh,
2604                            char *search_buf,
2605                            int buf_size,
2606                            struct inode *dir,
2607                            struct ext4_filename *fname,
2608                            unsigned int offset,
2609                            struct ext4_dir_entry_2 **res_dir);
2610 extern int ext4_generic_delete_entry(handle_t *handle,
2611                                      struct inode *dir,
2612                                      struct ext4_dir_entry_2 *de_del,
2613                                      struct buffer_head *bh,
2614                                      void *entry_buf,
2615                                      int buf_size,
2616                                      int csum_size);
2617 extern bool ext4_empty_dir(struct inode *inode);
2618
2619 /* resize.c */
2620 extern void ext4_kvfree_array_rcu(void *to_free);
2621 extern int ext4_group_add(struct super_block *sb,
2622                                 struct ext4_new_group_data *input);
2623 extern int ext4_group_extend(struct super_block *sb,
2624                                 struct ext4_super_block *es,
2625                                 ext4_fsblk_t n_blocks_count);
2626 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2627
2628 /* super.c */
2629 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2630                                          sector_t block, int op_flags);
2631 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2632 extern int ext4_calculate_overhead(struct super_block *sb);
2633 extern void ext4_superblock_csum_set(struct super_block *sb);
2634 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2635 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2636 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2637                                     ext4_group_t ngroup);
2638 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2639                                      char nbuf[16]);
2640 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2641                                              ext4_group_t block_group,
2642                                              unsigned int flags);
2643
2644 extern __printf(4, 5)
2645 void __ext4_error(struct super_block *, const char *, unsigned int,
2646                   const char *, ...);
2647 extern __printf(5, 6)
2648 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2649                       const char *, ...);
2650 extern __printf(5, 6)
2651 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2652                      const char *, ...);
2653 extern void __ext4_std_error(struct super_block *, const char *,
2654                              unsigned int, int);
2655 extern __printf(4, 5)
2656 void __ext4_abort(struct super_block *, const char *, unsigned int,
2657                   const char *, ...);
2658 extern __printf(4, 5)
2659 void __ext4_warning(struct super_block *, const char *, unsigned int,
2660                     const char *, ...);
2661 extern __printf(4, 5)
2662 void __ext4_warning_inode(const struct inode *inode, const char *function,
2663                           unsigned int line, const char *fmt, ...);
2664 extern __printf(3, 4)
2665 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2666 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2667                            const char *, unsigned int, const char *);
2668 extern __printf(7, 8)
2669 void __ext4_grp_locked_error(const char *, unsigned int,
2670                              struct super_block *, ext4_group_t,
2671                              unsigned long, ext4_fsblk_t,
2672                              const char *, ...);
2673
2674 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2675         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2676
2677 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2678         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2679
2680 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2681         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2682
2683 #ifdef CONFIG_PRINTK
2684
2685 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2686         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2687 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2688         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2689 #define ext4_error(sb, fmt, ...)                                        \
2690         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2691 #define ext4_abort(sb, fmt, ...)                                        \
2692         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2693 #define ext4_warning(sb, fmt, ...)                                      \
2694         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2695 #define ext4_warning_inode(inode, fmt, ...)                             \
2696         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2697 #define ext4_msg(sb, level, fmt, ...)                           \
2698         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2699 #define dump_mmp_msg(sb, mmp, msg)                                      \
2700         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2701 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2702         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2703                                 fmt, ##__VA_ARGS__)
2704
2705 #else
2706
2707 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2708 do {                                                                    \
2709         no_printk(fmt, ##__VA_ARGS__);                                  \
2710         __ext4_error_inode(inode, "", 0, block, " ");                   \
2711 } while (0)
2712 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2713 do {                                                                    \
2714         no_printk(fmt, ##__VA_ARGS__);                                  \
2715         __ext4_error_file(file, "", 0, block, " ");                     \
2716 } while (0)
2717 #define ext4_error(sb, fmt, ...)                                        \
2718 do {                                                                    \
2719         no_printk(fmt, ##__VA_ARGS__);                                  \
2720         __ext4_error(sb, "", 0, " ");                                   \
2721 } while (0)
2722 #define ext4_abort(sb, fmt, ...)                                        \
2723 do {                                                                    \
2724         no_printk(fmt, ##__VA_ARGS__);                                  \
2725         __ext4_abort(sb, "", 0, " ");                                   \
2726 } while (0)
2727 #define ext4_warning(sb, fmt, ...)                                      \
2728 do {                                                                    \
2729         no_printk(fmt, ##__VA_ARGS__);                                  \
2730         __ext4_warning(sb, "", 0, " ");                                 \
2731 } while (0)
2732 #define ext4_warning_inode(inode, fmt, ...)                             \
2733 do {                                                                    \
2734         no_printk(fmt, ##__VA_ARGS__);                                  \
2735         __ext4_warning_inode(inode, "", 0, " ");                        \
2736 } while (0)
2737 #define ext4_msg(sb, level, fmt, ...)                                   \
2738 do {                                                                    \
2739         no_printk(fmt, ##__VA_ARGS__);                                  \
2740         __ext4_msg(sb, "", " ");                                        \
2741 } while (0)
2742 #define dump_mmp_msg(sb, mmp, msg)                                      \
2743         __dump_mmp_msg(sb, mmp, "", 0, "")
2744 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2745 do {                                                                    \
2746         no_printk(fmt, ##__VA_ARGS__);                          \
2747         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2748 } while (0)
2749
2750 #endif
2751
2752 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2753                                         __u32 compat);
2754 extern int ext4_update_rocompat_feature(handle_t *handle,
2755                                         struct super_block *sb, __u32 rocompat);
2756 extern int ext4_update_incompat_feature(handle_t *handle,
2757                                         struct super_block *sb, __u32 incompat);
2758 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2759                                       struct ext4_group_desc *bg);
2760 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2761                                       struct ext4_group_desc *bg);
2762 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2763                                      struct ext4_group_desc *bg);
2764 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2765                                       struct ext4_group_desc *bg);
2766 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2767                                  struct ext4_group_desc *bg);
2768 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2769                                 struct ext4_group_desc *bg);
2770 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2771                                    struct ext4_group_desc *bg);
2772 extern void ext4_block_bitmap_set(struct super_block *sb,
2773                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2774 extern void ext4_inode_bitmap_set(struct super_block *sb,
2775                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2776 extern void ext4_inode_table_set(struct super_block *sb,
2777                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2778 extern void ext4_free_group_clusters_set(struct super_block *sb,
2779                                          struct ext4_group_desc *bg,
2780                                          __u32 count);
2781 extern void ext4_free_inodes_set(struct super_block *sb,
2782                                 struct ext4_group_desc *bg, __u32 count);
2783 extern void ext4_used_dirs_set(struct super_block *sb,
2784                                 struct ext4_group_desc *bg, __u32 count);
2785 extern void ext4_itable_unused_set(struct super_block *sb,
2786                                    struct ext4_group_desc *bg, __u32 count);
2787 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2788                                        struct ext4_group_desc *gdp);
2789 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2790                                      struct ext4_group_desc *gdp);
2791 extern int ext4_register_li_request(struct super_block *sb,
2792                                     ext4_group_t first_not_zeroed);
2793
2794 static inline int ext4_has_metadata_csum(struct super_block *sb)
2795 {
2796         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2797                      !EXT4_SB(sb)->s_chksum_driver);
2798
2799         return ext4_has_feature_metadata_csum(sb) &&
2800                (EXT4_SB(sb)->s_chksum_driver != NULL);
2801 }
2802
2803 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2804 {
2805         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2806 }
2807
2808 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2809 {
2810         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2811                 le32_to_cpu(es->s_blocks_count_lo);
2812 }
2813
2814 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2815 {
2816         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2817                 le32_to_cpu(es->s_r_blocks_count_lo);
2818 }
2819
2820 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2821 {
2822         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2823                 le32_to_cpu(es->s_free_blocks_count_lo);
2824 }
2825
2826 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2827                                          ext4_fsblk_t blk)
2828 {
2829         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2830         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2831 }
2832
2833 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2834                                               ext4_fsblk_t blk)
2835 {
2836         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2837         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2838 }
2839
2840 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2841                                            ext4_fsblk_t blk)
2842 {
2843         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2844         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2845 }
2846
2847 static inline loff_t ext4_isize(struct super_block *sb,
2848                                 struct ext4_inode *raw_inode)
2849 {
2850         if (ext4_has_feature_largedir(sb) ||
2851             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2852                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2853                         le32_to_cpu(raw_inode->i_size_lo);
2854
2855         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2856 }
2857
2858 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2859 {
2860         raw_inode->i_size_lo = cpu_to_le32(i_size);
2861         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2862 }
2863
2864 static inline
2865 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2866                                             ext4_group_t group)
2867 {
2868          struct ext4_group_info **grp_info;
2869          long indexv, indexh;
2870          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2871          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2872          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2873          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
2874          return grp_info[indexh];
2875 }
2876
2877 /*
2878  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2879  * the locking protocol documented in the comments of ext4_group_add()
2880  * in resize.c
2881  */
2882 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2883 {
2884         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2885
2886         smp_rmb();
2887         return ngroups;
2888 }
2889
2890 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2891                                              ext4_group_t block_group)
2892 {
2893         return block_group >> sbi->s_log_groups_per_flex;
2894 }
2895
2896 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2897 {
2898         return 1 << sbi->s_log_groups_per_flex;
2899 }
2900
2901 #define ext4_std_error(sb, errno)                               \
2902 do {                                                            \
2903         if ((errno))                                            \
2904                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2905 } while (0)
2906
2907 #ifdef CONFIG_SMP
2908 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2909  * counters. So we need to make sure we have free clusters more
2910  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2911  */
2912 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2913 #else
2914 #define EXT4_FREECLUSTERS_WATERMARK 0
2915 #endif
2916
2917 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2918 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2919 {
2920         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2921                      !inode_is_locked(inode));
2922         down_write(&EXT4_I(inode)->i_data_sem);
2923         if (newsize > EXT4_I(inode)->i_disksize)
2924                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
2925         up_write(&EXT4_I(inode)->i_data_sem);
2926 }
2927
2928 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2929 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2930 {
2931         int changed = 0;
2932
2933         if (newsize > inode->i_size) {
2934                 i_size_write(inode, newsize);
2935                 changed = 1;
2936         }
2937         if (newsize > EXT4_I(inode)->i_disksize) {
2938                 ext4_update_i_disksize(inode, newsize);
2939                 changed |= 2;
2940         }
2941         return changed;
2942 }
2943
2944 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2945                                       loff_t len);
2946
2947 struct ext4_group_info {
2948         unsigned long   bb_state;
2949         struct rb_root  bb_free_root;
2950         ext4_grpblk_t   bb_first_free;  /* first free block */
2951         ext4_grpblk_t   bb_free;        /* total free blocks */
2952         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2953         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2954         struct          list_head bb_prealloc_list;
2955 #ifdef DOUBLE_CHECK
2956         void            *bb_bitmap;
2957 #endif
2958         struct rw_semaphore alloc_sem;
2959         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2960                                          * regions, index is order.
2961                                          * bb_counters[3] = 5 means
2962                                          * 5 free 8-block regions. */
2963 };
2964
2965 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2966 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2967 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2968 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2969 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
2970         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2971 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
2972         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
2973
2974 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2975         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2976 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2977         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2978 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2979         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2980
2981 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2982         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2983 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2984         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2985 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2986         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2987
2988 #define EXT4_MAX_CONTENTION             8
2989 #define EXT4_CONTENTION_THRESHOLD       2
2990
2991 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2992                                               ext4_group_t group)
2993 {
2994         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2995 }
2996
2997 /*
2998  * Returns true if the filesystem is busy enough that attempts to
2999  * access the block group locks has run into contention.
3000  */
3001 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3002 {
3003         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3004 }
3005
3006 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3007 {
3008         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3009         if (spin_trylock(lock))
3010                 /*
3011                  * We're able to grab the lock right away, so drop the
3012                  * lock contention counter.
3013                  */
3014                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3015         else {
3016                 /*
3017                  * The lock is busy, so bump the contention counter,
3018                  * and then wait on the spin lock.
3019                  */
3020                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3021                                   EXT4_MAX_CONTENTION);
3022                 spin_lock(lock);
3023         }
3024 }
3025
3026 static inline void ext4_unlock_group(struct super_block *sb,
3027                                         ext4_group_t group)
3028 {
3029         spin_unlock(ext4_group_lock_ptr(sb, group));
3030 }
3031
3032 /*
3033  * Block validity checking
3034  */
3035 #define ext4_check_indirect_blockref(inode, bh)                         \
3036         ext4_check_blockref(__func__, __LINE__, inode,                  \
3037                             (__le32 *)(bh)->b_data,                     \
3038                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3039
3040 #define ext4_ind_check_inode(inode)                                     \
3041         ext4_check_blockref(__func__, __LINE__, inode,                  \
3042                             EXT4_I(inode)->i_data,                      \
3043                             EXT4_NDIR_BLOCKS)
3044
3045 /*
3046  * Inodes and files operations
3047  */
3048
3049 /* dir.c */
3050 extern const struct file_operations ext4_dir_operations;
3051
3052 /* file.c */
3053 extern const struct inode_operations ext4_file_inode_operations;
3054 extern const struct file_operations ext4_file_operations;
3055 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3056
3057 /* inline.c */
3058 extern int ext4_get_max_inline_size(struct inode *inode);
3059 extern int ext4_find_inline_data_nolock(struct inode *inode);
3060 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3061                                  unsigned int len);
3062 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3063
3064 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3065 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3066                                          struct inode *inode,
3067                                          loff_t pos, unsigned len,
3068                                          unsigned flags,
3069                                          struct page **pagep);
3070 extern int ext4_write_inline_data_end(struct inode *inode,
3071                                       loff_t pos, unsigned len,
3072                                       unsigned copied,
3073                                       struct page *page);
3074 extern struct buffer_head *
3075 ext4_journalled_write_inline_data(struct inode *inode,
3076                                   unsigned len,
3077                                   struct page *page);
3078 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3079                                            struct inode *inode,
3080                                            loff_t pos, unsigned len,
3081                                            unsigned flags,
3082                                            struct page **pagep,
3083                                            void **fsdata);
3084 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3085                                          unsigned len, unsigned copied,
3086                                          struct page *page);
3087 extern int ext4_try_add_inline_entry(handle_t *handle,
3088                                      struct ext4_filename *fname,
3089                                      struct inode *dir, struct inode *inode);
3090 extern int ext4_try_create_inline_dir(handle_t *handle,
3091                                       struct inode *parent,
3092                                       struct inode *inode);
3093 extern int ext4_read_inline_dir(struct file *filp,
3094                                 struct dir_context *ctx,
3095                                 int *has_inline_data);
3096 extern int htree_inlinedir_to_tree(struct file *dir_file,
3097                                    struct inode *dir, ext4_lblk_t block,
3098                                    struct dx_hash_info *hinfo,
3099                                    __u32 start_hash, __u32 start_minor_hash,
3100                                    int *has_inline_data);
3101 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3102                                         struct ext4_filename *fname,
3103                                         struct ext4_dir_entry_2 **res_dir,
3104                                         int *has_inline_data);
3105 extern int ext4_delete_inline_entry(handle_t *handle,
3106                                     struct inode *dir,
3107                                     struct ext4_dir_entry_2 *de_del,
3108                                     struct buffer_head *bh,
3109                                     int *has_inline_data);
3110 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3111 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3112                                         struct ext4_dir_entry_2 **parent_de,
3113                                         int *retval);
3114 extern int ext4_inline_data_fiemap(struct inode *inode,
3115                                    struct fiemap_extent_info *fieinfo,
3116                                    int *has_inline, __u64 start, __u64 len);
3117
3118 struct iomap;
3119 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3120
3121 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3122
3123 extern int ext4_convert_inline_data(struct inode *inode);
3124
3125 static inline int ext4_has_inline_data(struct inode *inode)
3126 {
3127         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3128                EXT4_I(inode)->i_inline_off;
3129 }
3130
3131 /* namei.c */
3132 extern const struct inode_operations ext4_dir_inode_operations;
3133 extern const struct inode_operations ext4_special_inode_operations;
3134 extern struct dentry *ext4_get_parent(struct dentry *child);
3135 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3136                                  struct ext4_dir_entry_2 *de,
3137                                  int blocksize, int csum_size,
3138                                  unsigned int parent_ino, int dotdot_real_len);
3139 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3140                                    unsigned int blocksize);
3141 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3142                                          struct inode *inode,
3143                                          struct buffer_head *bh);
3144 #define S_SHIFT 12
3145 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3146         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3147         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3148         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3149         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3150         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3151         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3152         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3153 };
3154
3155 static inline void ext4_set_de_type(struct super_block *sb,
3156                                 struct ext4_dir_entry_2 *de,
3157                                 umode_t mode) {
3158         if (ext4_has_feature_filetype(sb))
3159                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3160 }
3161
3162 /* readpages.c */
3163 extern int ext4_mpage_readpages(struct address_space *mapping,
3164                                 struct list_head *pages, struct page *page,
3165                                 unsigned nr_pages, bool is_readahead);
3166
3167 /* symlink.c */
3168 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3169 extern const struct inode_operations ext4_symlink_inode_operations;
3170 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3171
3172 /* sysfs.c */
3173 extern int ext4_register_sysfs(struct super_block *sb);
3174 extern void ext4_unregister_sysfs(struct super_block *sb);
3175 extern int __init ext4_init_sysfs(void);
3176 extern void ext4_exit_sysfs(void);
3177
3178 /* block_validity */
3179 extern void ext4_release_system_zone(struct super_block *sb);
3180 extern int ext4_setup_system_zone(struct super_block *sb);
3181 extern int __init ext4_init_system_zone(void);
3182 extern void ext4_exit_system_zone(void);
3183 extern int ext4_inode_block_valid(struct inode *inode,
3184                                   ext4_fsblk_t start_blk,
3185                                   unsigned int count);
3186 extern int ext4_check_blockref(const char *, unsigned int,
3187                                struct inode *, __le32 *, unsigned int);
3188
3189 /* extents.c */
3190 struct ext4_ext_path;
3191 struct ext4_extent;
3192
3193 /*
3194  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3195  * __le32.
3196  */
3197 #define EXT_MAX_BLOCKS  0xffffffff
3198
3199 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3200 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3201 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3202 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3203                                struct ext4_map_blocks *map, int flags);
3204 extern int ext4_ext_truncate(handle_t *, struct inode *);
3205 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3206                                  ext4_lblk_t end);
3207 extern void ext4_ext_init(struct super_block *);
3208 extern void ext4_ext_release(struct super_block *);
3209 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3210                           loff_t len);
3211 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3212                                           loff_t offset, ssize_t len);
3213 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3214                            struct ext4_map_blocks *map, int flags);
3215 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3216                                          ext4_lblk_t lblocks);
3217 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3218                                                    int num,
3219                                                    struct ext4_ext_path *path);
3220 extern int ext4_can_extents_be_merged(struct inode *inode,
3221                                       struct ext4_extent *ex1,
3222                                       struct ext4_extent *ex2);
3223 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3224                                   struct ext4_ext_path **,
3225                                   struct ext4_extent *, int);
3226 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3227                                               struct ext4_ext_path **,
3228                                               int flags);
3229 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3230 extern int ext4_ext_check_inode(struct inode *inode);
3231 extern int ext4_find_delalloc_range(struct inode *inode,
3232                                     ext4_lblk_t lblk_start,
3233                                     ext4_lblk_t lblk_end);
3234 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3235 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3236 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3237                         __u64 start, __u64 len);
3238 extern int ext4_ext_precache(struct inode *inode);
3239 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3240 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3241 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3242                                 struct inode *inode2, ext4_lblk_t lblk1,
3243                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3244                              int mark_unwritten,int *err);
3245
3246 /* move_extent.c */
3247 extern void ext4_double_down_write_data_sem(struct inode *first,
3248                                             struct inode *second);
3249 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3250                                           struct inode *donor_inode);
3251 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3252                              __u64 start_orig, __u64 start_donor,
3253                              __u64 len, __u64 *moved_len);
3254
3255 /* page-io.c */
3256 extern int __init ext4_init_pageio(void);
3257 extern void ext4_exit_pageio(void);
3258 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3259 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3260 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3261 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3262 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3263                                 struct writeback_control *wbc);
3264 extern void ext4_end_io_rsv_work(struct work_struct *work);
3265 extern void ext4_io_submit(struct ext4_io_submit *io);
3266 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3267                                struct page *page,
3268                                int len,
3269                                struct writeback_control *wbc,
3270                                bool keep_towrite);
3271
3272 /* mmp.c */
3273 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3274
3275 /*
3276  * Add new method to test whether block and inode bitmaps are properly
3277  * initialized. With uninit_bg reading the block from disk is not enough
3278  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3279  */
3280 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3281
3282 static inline int bitmap_uptodate(struct buffer_head *bh)
3283 {
3284         return (buffer_uptodate(bh) &&
3285                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3286 }
3287 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3288 {
3289         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3290 }
3291
3292 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3293
3294 /* For ioend & aio unwritten conversion wait queues */
3295 #define EXT4_WQ_HASH_SZ         37
3296 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3297                                             EXT4_WQ_HASH_SZ])
3298 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3299
3300 extern int ext4_resize_begin(struct super_block *sb);
3301 extern void ext4_resize_end(struct super_block *sb);
3302
3303 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3304                                               struct ext4_io_end *io_end)
3305 {
3306         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3307                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3308                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3309         }
3310 }
3311
3312 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3313 {
3314         struct inode *inode = io_end->inode;
3315
3316         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3317                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3318                 /* Wake up anyone waiting on unwritten extent conversion */
3319                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3320                         wake_up_all(ext4_ioend_wq(inode));
3321         }
3322 }
3323
3324 extern const struct iomap_ops ext4_iomap_ops;
3325
3326 #endif  /* __KERNEL__ */
3327
3328 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3329 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3330
3331 #endif  /* _EXT4_H */