fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card ([email protected])
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/version.h>
  31 #include <linux/wait.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/blockgroup_lock.h>
  34 #include <linux/percpu_counter.h>
  35 #include <linux/ratelimit.h>
  36 #include <crypto/hash.h>
  37 #include <linux/falloc.h>
  38 #include <linux/percpu-rwsem.h>
  39 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #include <linux/fscrypt.h>
  44
  45 #include <linux/compiler.h>
  46
  47 /*
  48  * The fourth extended filesystem constants/structures
  49  */
  50
  51 /*
  52  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  53  * structures. these checks slow things down a lot
  54  */
  55 #define AGGRESSIVE_CHECK__
  56
  57 /*
  58  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  59  * bitmaps, maintains and uses them to check for double allocations
  60  */
  61 #define DOUBLE_CHECK__
  62
  63 /*
  64  * Define EXT4FS_DEBUG to produce debug messages
  65  */
  66 #undef EXT4FS_DEBUG
  67
  68 /*
  69  * Debug code
  70  */
  71 #ifdef EXT4FS_DEBUG
  72 #define ext4_debug(f, a...)                                             \
  73         do {                                                            \
  74                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  75                         __FILE__, __LINE__, __func__);                  \
  76                 printk(KERN_DEBUG f, ## a);                             \
  77         } while (0)
  78 #else
  79 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  80 #endif
  81
  82 /*
  83  * Turn on EXT_DEBUG to get lots of info about extents operations.
  84  */
  85 #define EXT_DEBUG__
  86 #ifdef EXT_DEBUG
  87 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  88 #else
  89 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  90 #endif
  91
  92 /* data type for block offset of block group */
  93 typedef int ext4_grpblk_t;
  94
  95 /* data type for filesystem-wide blocks number */
  96 typedef unsigned long long ext4_fsblk_t;
  97
  98 /* data type for file logical block number */
  99 typedef __u32 ext4_lblk_t;
 100
 101 /* data type for block group number */
 102 typedef unsigned int ext4_group_t;
 103
 104 enum SHIFT_DIRECTION {
 105         SHIFT_LEFT = 0,
 106         SHIFT_RIGHT,
 107 };
 108
 109 /*
 110  * Flags used in mballoc's allocation_context flags field.
 111  *
 112  * Also used to show what's going on for debugging purposes when the
 113  * flag field is exported via the traceport interface
 114  */
 115
 116 /* prefer goal again. length */
 117 #define EXT4_MB_HINT_MERGE              0x0001
 118 /* blocks already reserved */
 119 #define EXT4_MB_HINT_RESERVED           0x0002
 120 /* metadata is being allocated */
 121 #define EXT4_MB_HINT_METADATA           0x0004
 122 /* first blocks in the file */
 123 #define EXT4_MB_HINT_FIRST              0x0008
 124 /* search for the best chunk */
 125 #define EXT4_MB_HINT_BEST               0x0010
 126 /* data is being allocated */
 127 #define EXT4_MB_HINT_DATA               0x0020
 128 /* don't preallocate (for tails) */
 129 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 130 /* allocate for locality group */
 131 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 132 /* allocate goal blocks or none */
 133 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 134 /* goal is meaningful */
 135 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 136 /* blocks already pre-reserved by delayed allocation */
 137 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 138 /* We are doing stream allocation */
 139 #define EXT4_MB_STREAM_ALLOC            0x0800
 140 /* Use reserved root blocks if needed */
 141 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 142 /* Use blocks from reserved pool */
 143 #define EXT4_MB_USE_RESERVED            0x2000
 144
 145 struct ext4_allocation_request {
 146         /* target inode for block we're allocating */
 147         struct inode *inode;
 148         /* how many blocks we want to allocate */
 149         unsigned int len;
 150         /* logical block in target inode */
 151         ext4_lblk_t logical;
 152         /* the closest logical allocated block to the left */
 153         ext4_lblk_t lleft;
 154         /* the closest logical allocated block to the right */
 155         ext4_lblk_t lright;
 156         /* phys. target (a hint) */
 157         ext4_fsblk_t goal;
 158         /* phys. block for the closest logical allocated block to the left */
 159         ext4_fsblk_t pleft;
 160         /* phys. block for the closest logical allocated block to the right */
 161         ext4_fsblk_t pright;
 162         /* flags. see above EXT4_MB_HINT_* */
 163         unsigned int flags;
 164 };
 165
 166 /*
 167  * Logical to physical block mapping, used by ext4_map_blocks()
 168  *
 169  * This structure is used to pass requests into ext4_map_blocks() as
 170  * well as to store the information returned by ext4_map_blocks().  It
 171  * takes less room on the stack than a struct buffer_head.
 172  */
 173 #define EXT4_MAP_NEW            (1 << BH_New)
 174 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 175 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 176 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 177 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 178                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 179
 180 struct ext4_map_blocks {
 181         ext4_fsblk_t m_pblk;
 182         ext4_lblk_t m_lblk;
 183         unsigned int m_len;
 184         unsigned int m_flags;
 185 };
 186
 187 /*
 188  * Flags for ext4_io_end->flags
 189  */
 190 #define EXT4_IO_END_UNWRITTEN   0x0001
 191
 192 /*
 193  * For converting unwritten extents on a work queue. 'handle' is used for
 194  * buffered writeback.
 195  */
 196 typedef struct ext4_io_end {
 197         struct list_head        list;           /* per-file finished IO list */
 198         handle_t                *handle;        /* handle reserved for extent
 199                                                  * conversion */
 200         struct inode            *inode;         /* file being written to */
 201         struct bio              *bio;           /* Linked list of completed
 202                                                  * bios covering the extent */
 203         unsigned int            flag;           /* unwritten or not */
 204         atomic_t                count;          /* reference counter */
 205         loff_t                  offset;         /* offset in the file */
 206         ssize_t                 size;           /* size of the extent */
 207 } ext4_io_end_t;
 208
 209 struct ext4_io_submit {
 210         struct writeback_control *io_wbc;
 211         struct bio              *io_bio;
 212         ext4_io_end_t           *io_end;
 213         sector_t                io_next_block;
 214 };
 215
 216 /*
 217  * Special inodes numbers
 218  */
 219 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 220 #define EXT4_ROOT_INO            2      /* Root inode */
 221 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 222 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 223 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 224 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 225 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 226 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 227
 228 /* First non-reserved inode for old ext4 filesystems */
 229 #define EXT4_GOOD_OLD_FIRST_INO 11
 230
 231 /*
 232  * Maximal count of links to a file
 233  */
 234 #define EXT4_LINK_MAX           65000
 235
 236 /*
 237  * Macro-instructions used to manage several block sizes
 238  */
 239 #define EXT4_MIN_BLOCK_SIZE             1024
 240 #define EXT4_MAX_BLOCK_SIZE             65536
 241 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 242 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 243 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 244 #ifdef __KERNEL__
 245 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 246 #else
 247 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 248 #endif
 249 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 250 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 251                                          EXT4_SB(s)->s_cluster_bits)
 252 #ifdef __KERNEL__
 253 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 254 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 255 #else
 256 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 257 #endif
 258 #ifdef __KERNEL__
 259 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 260 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 261 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 262 #else
 263 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 264                                  EXT4_GOOD_OLD_INODE_SIZE : \
 265                                  (s)->s_inode_size)
 266 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 267                                  EXT4_GOOD_OLD_FIRST_INO : \
 268                                  (s)->s_first_ino)
 269 #endif
 270 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 271 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 272         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 273                                                                   blkbits))
 274
 275 /* Translate a block number to a cluster number */
 276 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 277 /* Translate a cluster number to a block number */
 278 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 279 /* Translate # of blks to # of clusters */
 280 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 281                                  (sbi)->s_cluster_bits)
 282 /* Mask out the low bits to get the starting block of the cluster */
 283 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 284                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 285 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 286                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 287 /* Get the cluster offset */
 288 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 289                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 290 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 291                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 292
 293 /*
 294  * Structure of a blocks group descriptor
 295  */
 296 struct ext4_group_desc
 297 {
 298         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 299         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 300         __le32  bg_inode_table_lo;      /* Inodes table block */
 301         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 302         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 303         __le16  bg_used_dirs_count_lo;  /* Directories count */
 304         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 305         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 306         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 307         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 308         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 309         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 310         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 311         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 312         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 313         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 314         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 315         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 316         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 317         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 318         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 319         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 320         __u32   bg_reserved;
 321 };
 322
 323 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 324         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 325          sizeof(__le16))
 326 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 327         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 328          sizeof(__le16))
 329
 330 /*
 331  * Structure of a flex block group info
 332  */
 333
 334 struct flex_groups {
 335         atomic64_t      free_clusters;
 336         atomic_t        free_inodes;
 337         atomic_t        used_dirs;
 338 };
 339
 340 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 341 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 342 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 343
 344 /*
 345  * Macro-instructions used to manage group descriptors
 346  */
 347 #define EXT4_MIN_DESC_SIZE              32
 348 #define EXT4_MIN_DESC_SIZE_64BIT        64
 349 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 350 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 351 #ifdef __KERNEL__
 352 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 353 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 354 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 355 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 356 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 357 #else
 358 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 359 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 360 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 361 #endif
 362
 363 /*
 364  * Constants relative to the data blocks
 365  */
 366 #define EXT4_NDIR_BLOCKS                12
 367 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 368 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 369 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 370 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 371
 372 /*
 373  * Inode flags
 374  */
 375 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 376 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 377 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 378 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 379 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 380 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 381 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 382 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 383 /* Reserved for compression usage... */
 384 #define EXT4_DIRTY_FL                   0x00000100
 385 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 386 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 387         /* nb: was previously EXT2_ECOMPR_FL */
 388 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 389 /* End compression flags --- maybe not all used */
 390 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 391 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 392 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 393 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 394 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 395 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 396 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 397 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 398 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 399 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 400 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 401 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 402 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded file */
 403 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 404
 405 #define EXT4_FL_USER_VISIBLE            0x704BDFFF /* User visible flags */
 406 #define EXT4_FL_USER_MODIFIABLE         0x604BC0FF /* User modifiable flags */
 407
 408 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 409 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 410                                          EXT4_IMMUTABLE_FL | \
 411                                          EXT4_APPEND_FL | \
 412                                          EXT4_NODUMP_FL | \
 413                                          EXT4_NOATIME_FL | \
 414                                          EXT4_PROJINHERIT_FL)
 415
 416 /* Flags that should be inherited by new inodes from their parent. */
 417 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 418                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 419                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 420                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 421                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
 422
 423 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 424 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 425                            EXT4_PROJINHERIT_FL))
 426
 427 /* Flags that are appropriate for non-directories/regular files. */
 428 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 429
 430 /* The only flags that should be swapped */
 431 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 432
 433 /* Mask out flags that are inappropriate for the given type of inode. */
 434 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 435 {
 436         if (S_ISDIR(mode))
 437                 return flags;
 438         else if (S_ISREG(mode))
 439                 return flags & EXT4_REG_FLMASK;
 440         else
 441                 return flags & EXT4_OTHER_FLMASK;
 442 }
 443
 444 /*
 445  * Inode flags used for atomic set/get
 446  */
 447 enum {
 448         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 449         EXT4_INODE_UNRM         = 1,    /* Undelete */
 450         EXT4_INODE_COMPR        = 2,    /* Compress file */
 451         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 452         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 453         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 454         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 455         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 456 /* Reserved for compression usage... */
 457         EXT4_INODE_DIRTY        = 8,
 458         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 459         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 460         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 461 /* End compression flags --- maybe not all used */
 462         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 463         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 464         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 465         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 466         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 467         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 468         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 469         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 470         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 471         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 472         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 473         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 474         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 475 };
 476
 477 /*
 478  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 479  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 480  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 481  * any extra space in the compiled kernel image, otherwise, the build will fail.
 482  * It's important that these values are the same, since we are using
 483  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 484  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 485  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 486  * defined in e2fsprogs.
 487  *
 488  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 489  */
 490 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 491 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 492
 493 static inline void ext4_check_flag_values(void)
 494 {
 495         CHECK_FLAG_VALUE(SECRM);
 496         CHECK_FLAG_VALUE(UNRM);
 497         CHECK_FLAG_VALUE(COMPR);
 498         CHECK_FLAG_VALUE(SYNC);
 499         CHECK_FLAG_VALUE(IMMUTABLE);
 500         CHECK_FLAG_VALUE(APPEND);
 501         CHECK_FLAG_VALUE(NODUMP);
 502         CHECK_FLAG_VALUE(NOATIME);
 503         CHECK_FLAG_VALUE(DIRTY);
 504         CHECK_FLAG_VALUE(COMPRBLK);
 505         CHECK_FLAG_VALUE(NOCOMPR);
 506         CHECK_FLAG_VALUE(ENCRYPT);
 507         CHECK_FLAG_VALUE(INDEX);
 508         CHECK_FLAG_VALUE(IMAGIC);
 509         CHECK_FLAG_VALUE(JOURNAL_DATA);
 510         CHECK_FLAG_VALUE(NOTAIL);
 511         CHECK_FLAG_VALUE(DIRSYNC);
 512         CHECK_FLAG_VALUE(TOPDIR);
 513         CHECK_FLAG_VALUE(HUGE_FILE);
 514         CHECK_FLAG_VALUE(EXTENTS);
 515         CHECK_FLAG_VALUE(EA_INODE);
 516         CHECK_FLAG_VALUE(EOFBLOCKS);
 517         CHECK_FLAG_VALUE(INLINE_DATA);
 518         CHECK_FLAG_VALUE(PROJINHERIT);
 519         CHECK_FLAG_VALUE(RESERVED);
 520 }
 521
 522 /* Used to pass group descriptor data when online resize is done */
 523 struct ext4_new_group_input {
 524         __u32 group;            /* Group number for this data */
 525         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 526         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 527         __u64 inode_table;      /* Absolute block number of inode table start */
 528         __u32 blocks_count;     /* Total number of blocks in this group */
 529         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 530         __u16 unused;
 531 };
 532
 533 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 534 struct compat_ext4_new_group_input {
 535         u32 group;
 536         compat_u64 block_bitmap;
 537         compat_u64 inode_bitmap;
 538         compat_u64 inode_table;
 539         u32 blocks_count;
 540         u16 reserved_blocks;
 541         u16 unused;
 542 };
 543 #endif
 544
 545 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 546 struct ext4_new_group_data {
 547         __u32 group;
 548         __u64 block_bitmap;
 549         __u64 inode_bitmap;
 550         __u64 inode_table;
 551         __u32 blocks_count;
 552         __u16 reserved_blocks;
 553         __u16 mdata_blocks;
 554         __u32 free_clusters_count;
 555 };
 556
 557 /* Indexes used to index group tables in ext4_new_group_data */
 558 enum {
 559         BLOCK_BITMAP = 0,       /* block bitmap */
 560         INODE_BITMAP,           /* inode bitmap */
 561         INODE_TABLE,            /* inode tables */
 562         GROUP_TABLE_COUNT,
 563 };
 564
 565 /*
 566  * Flags used by ext4_map_blocks()
 567  */
 568         /* Allocate any needed blocks and/or convert an unwritten
 569            extent to be an initialized ext4 */
 570 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 571         /* Request the creation of an unwritten extent */
 572 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 573 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 574                                                  EXT4_GET_BLOCKS_CREATE)
 575         /* Caller is from the delayed allocation writeout path
 576          * finally doing the actual allocation of delayed blocks */
 577 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 578         /* caller is from the direct IO path, request to creation of an
 579         unwritten extents if not allocated, split the unwritten
 580         extent if blocks has been preallocated already*/
 581 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 582 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 583 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 584                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 585         /* Convert extent to initialized after IO complete */
 586 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 587                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 588         /* Eventual metadata allocation (due to growing extent tree)
 589          * should not fail, so try to use reserved blocks for that.*/
 590 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 591         /* Don't normalize allocation size (used for fallocate) */
 592 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 593         /* Request will not result in inode size update (user for fallocate) */
 594 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 595         /* Convert written extents to unwritten */
 596 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 597         /* Write zeros to newly created written extents */
 598 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 599 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 600                                         EXT4_GET_BLOCKS_ZERO)
 601         /* Caller will submit data before dropping transaction handle. This
 602          * allows jbd2 to avoid submitting data before commit. */
 603 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 604
 605 /*
 606  * The bit position of these flags must not overlap with any of the
 607  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 608  * read_extent_tree_block(), ext4_split_extent_at(),
 609  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 610  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 611  * caching the extents when reading from the extent tree while a
 612  * truncate or punch hole operation is in progress.
 613  */
 614 #define EXT4_EX_NOCACHE                         0x40000000
 615 #define EXT4_EX_FORCE_CACHE                     0x20000000
 616
 617 /*
 618  * Flags used by ext4_free_blocks
 619  */
 620 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 621 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 622 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 623 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 624 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 625 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 626 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 627
 628 /*
 629  * ioctl commands
 630  */
 631 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 632 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 633 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 634 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 635 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 636 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 637 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 638 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 639 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 640 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 641 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 642  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 643  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 644 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 645 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 646 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 647 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 648 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 649 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 650 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 651 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 652
 653 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 654 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 655
 656 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 657
 658 /*
 659  * Flags for going down operation
 660  */
 661 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 662 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 663 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 664
 665
 666 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 667 /*
 668  * ioctl commands in 32 bit emulation
 669  */
 670 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 671 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 672 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 673 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 674 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 675 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 676 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 677 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 678 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 679 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 680 #endif
 681
 682 /* Max physical block we can address w/o extents */
 683 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 684
 685 /* Max logical block we can support */
 686 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 687
 688 /*
 689  * Structure of an inode on the disk
 690  */
 691 struct ext4_inode {
 692         __le16  i_mode;         /* File mode */
 693         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 694         __le32  i_size_lo;      /* Size in bytes */
 695         __le32  i_atime;        /* Access time */
 696         __le32  i_ctime;        /* Inode Change time */
 697         __le32  i_mtime;        /* Modification time */
 698         __le32  i_dtime;        /* Deletion Time */
 699         __le16  i_gid;          /* Low 16 bits of Group Id */
 700         __le16  i_links_count;  /* Links count */
 701         __le32  i_blocks_lo;    /* Blocks count */
 702         __le32  i_flags;        /* File flags */
 703         union {
 704                 struct {
 705                         __le32  l_i_version;
 706                 } linux1;
 707                 struct {
 708                         __u32  h_i_translator;
 709                 } hurd1;
 710                 struct {
 711                         __u32  m_i_reserved1;
 712                 } masix1;
 713         } osd1;                         /* OS dependent 1 */
 714         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 715         __le32  i_generation;   /* File version (for NFS) */
 716         __le32  i_file_acl_lo;  /* File ACL */
 717         __le32  i_size_high;
 718         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 719         union {
 720                 struct {
 721                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 722                         __le16  l_i_file_acl_high;
 723                         __le16  l_i_uid_high;   /* these 2 fields */
 724                         __le16  l_i_gid_high;   /* were reserved2[0] */
 725                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 726                         __le16  l_i_reserved;
 727                 } linux2;
 728                 struct {
 729                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 730                         __u16   h_i_mode_high;
 731                         __u16   h_i_uid_high;
 732                         __u16   h_i_gid_high;
 733                         __u32   h_i_author;
 734                 } hurd2;
 735                 struct {
 736                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 737                         __le16  m_i_file_acl_high;
 738                         __u32   m_i_reserved2[2];
 739                 } masix2;
 740         } osd2;                         /* OS dependent 2 */
 741         __le16  i_extra_isize;
 742         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 743         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 744         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 745         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 746         __le32  i_crtime;       /* File Creation time */
 747         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 748         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 749         __le32  i_projid;       /* Project ID */
 750 };
 751
 752 struct move_extent {
 753         __u32 reserved;         /* should be zero */
 754         __u32 donor_fd;         /* donor file descriptor */
 755         __u64 orig_start;       /* logical start offset in block for orig */
 756         __u64 donor_start;      /* logical start offset in block for donor */
 757         __u64 len;              /* block length to be moved */
 758         __u64 moved_len;        /* moved block length */
 759 };
 760
 761 #define EXT4_EPOCH_BITS 2
 762 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 763 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 764
 765 /*
 766  * Extended fields will fit into an inode if the filesystem was formatted
 767  * with large inodes (-I 256 or larger) and there are not currently any EAs
 768  * consuming all of the available space. For new inodes we always reserve
 769  * enough space for the kernel's known extended fields, but for inodes
 770  * created with an old kernel this might not have been the case. None of
 771  * the extended inode fields is critical for correct filesystem operation.
 772  * This macro checks if a certain field fits in the inode. Note that
 773  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 774  */
 775 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 776         ((offsetof(typeof(*ext4_inode), field) +        \
 777           sizeof((ext4_inode)->field))                  \
 778         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 779             (einode)->i_extra_isize))                   \
 780
 781 /*
 782  * We use an encoding that preserves the times for extra epoch "00":
 783  *
 784  * extra  msb of                         adjust for signed
 785  * epoch  32-bit                         32-bit tv_sec to
 786  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 787  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 788  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 789  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 790  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 791  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 792  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 793  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 794  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 795  *
 796  * Note that previous versions of the kernel on 64-bit systems would
 797  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 798  * 1970.  e2fsck will correct this, assuming that it is run on the
 799  * affected filesystem before 2242.
 800  */
 801
 802 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 803 {
 804         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 805         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 806 }
 807
 808 static inline void ext4_decode_extra_time(struct timespec64 *time,
 809                                           __le32 extra)
 810 {
 811         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
 812
 813 #if 1
 814                 /* Handle legacy encoding of pre-1970 dates with epoch
 815                  * bits 1,1. (This backwards compatibility may be removed
 816                  * at the discretion of the ext4 developers.)
 817                  */
 818                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 819                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 820                         extra_bits = 0;
 821                 time->tv_sec += extra_bits << 32;
 822 #else
 823                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 824 #endif
 825         }
 826         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 827 }
 828
 829 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 830 do {                                                                            \
 831         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);                \
 832         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 833                 (raw_inode)->xtime ## _extra =                                  \
 834                                 ext4_encode_extra_time(&(inode)->xtime);        \
 835                 }                                                               \
 836 } while (0)
 837
 838 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 839 do {                                                                           \
 840         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 841                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 842         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 843                 (raw_inode)->xtime ## _extra =                                 \
 844                                 ext4_encode_extra_time(&(einode)->xtime);      \
 845 } while (0)
 846
 847 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 848 do {                                                                            \
 849         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 850         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 851                 ext4_decode_extra_time(&(inode)->xtime,                         \
 852                                        raw_inode->xtime ## _extra);             \
 853                 }                                                               \
 854         else                                                                    \
 855                 (inode)->xtime.tv_nsec = 0;                                     \
 856 } while (0)
 857
 858
 859 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 860 do {                                                                           \
 861         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 862                 (einode)->xtime.tv_sec =                                       \
 863                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 864         else                                                                   \
 865                 (einode)->xtime.tv_sec = 0;                                    \
 866         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 867                 ext4_decode_extra_time(&(einode)->xtime,                       \
 868                                        raw_inode->xtime ## _extra);            \
 869         else                                                                   \
 870                 (einode)->xtime.tv_nsec = 0;                                   \
 871 } while (0)
 872
 873 #define i_disk_version osd1.linux1.l_i_version
 874
 875 #if defined(__KERNEL__) || defined(__linux__)
 876 #define i_reserved1     osd1.linux1.l_i_reserved1
 877 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 878 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 879 #define i_uid_low       i_uid
 880 #define i_gid_low       i_gid
 881 #define i_uid_high      osd2.linux2.l_i_uid_high
 882 #define i_gid_high      osd2.linux2.l_i_gid_high
 883 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 884
 885 #elif defined(__GNU__)
 886
 887 #define i_translator    osd1.hurd1.h_i_translator
 888 #define i_uid_high      osd2.hurd2.h_i_uid_high
 889 #define i_gid_high      osd2.hurd2.h_i_gid_high
 890 #define i_author        osd2.hurd2.h_i_author
 891
 892 #elif defined(__masix__)
 893
 894 #define i_reserved1     osd1.masix1.m_i_reserved1
 895 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 896 #define i_reserved2     osd2.masix2.m_i_reserved2
 897
 898 #endif /* defined(__KERNEL__) || defined(__linux__) */
 899
 900 #include "extents_status.h"
 901
 902 /*
 903  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 904  *
 905  * These are needed to avoid lockdep false positives when we need to
 906  * allocate blocks to the quota inode during ext4_map_blocks(), while
 907  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 908  * do quota tracking for the quota inode, this avoids deadlock (as
 909  * well as infinite recursion, since it isn't turtles all the way
 910  * down...)
 911  *
 912  *  I_DATA_SEM_NORMAL - Used for most inodes
 913  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 914  *                        where the second inode has larger inode number
 915  *                        than the first
 916  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 917  */
 918 enum {
 919         I_DATA_SEM_NORMAL = 0,
 920         I_DATA_SEM_OTHER,
 921         I_DATA_SEM_QUOTA,
 922 };
 923
 924
 925 /*
 926  * fourth extended file system inode data in memory
 927  */
 928 struct ext4_inode_info {
 929         __le32  i_data[15];     /* unconverted */
 930         __u32   i_dtime;
 931         ext4_fsblk_t    i_file_acl;
 932
 933         /*
 934          * i_block_group is the number of the block group which contains
 935          * this file's inode.  Constant across the lifetime of the inode,
 936          * it is used for making block allocation decisions - we try to
 937          * place a file's data blocks near its inode block, and new inodes
 938          * near to their parent directory's inode.
 939          */
 940         ext4_group_t    i_block_group;
 941         ext4_lblk_t     i_dir_start_lookup;
 942 #if (BITS_PER_LONG < 64)
 943         unsigned long   i_state_flags;          /* Dynamic state flags */
 944 #endif
 945         unsigned long   i_flags;
 946
 947         /*
 948          * Extended attributes can be read independently of the main file
 949          * data. Taking i_mutex even when reading would cause contention
 950          * between readers of EAs and writers of regular file data, so
 951          * instead we synchronize on xattr_sem when reading or changing
 952          * EAs.
 953          */
 954         struct rw_semaphore xattr_sem;
 955
 956         struct list_head i_orphan;      /* unlinked but open inodes */
 957
 958         /*
 959          * i_disksize keeps track of what the inode size is ON DISK, not
 960          * in memory.  During truncate, i_size is set to the new size by
 961          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 962          * set i_disksize to 0 until the truncate is actually under way.
 963          *
 964          * The intent is that i_disksize always represents the blocks which
 965          * are used by this file.  This allows recovery to restart truncate
 966          * on orphans if we crash during truncate.  We actually write i_disksize
 967          * into the on-disk inode when writing inodes out, instead of i_size.
 968          *
 969          * The only time when i_disksize and i_size may be different is when
 970          * a truncate is in progress.  The only things which change i_disksize
 971          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 972          */
 973         loff_t  i_disksize;
 974
 975         /*
 976          * i_data_sem is for serialising ext4_truncate() against
 977          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 978          * data tree are chopped off during truncate. We can't do that in
 979          * ext4 because whenever we perform intermediate commits during
 980          * truncate, the inode and all the metadata blocks *must* be in a
 981          * consistent state which allows truncation of the orphans to restart
 982          * during recovery.  Hence we must fix the get_block-vs-truncate race
 983          * by other means, so we have i_data_sem.
 984          */
 985         struct rw_semaphore i_data_sem;
 986         /*
 987          * i_mmap_sem is for serializing page faults with truncate / punch hole
 988          * operations. We have to make sure that new page cannot be faulted in
 989          * a section of the inode that is being punched. We cannot easily use
 990          * i_data_sem for this since we need protection for the whole punch
 991          * operation and i_data_sem ranks below transaction start so we have
 992          * to occasionally drop it.
 993          */
 994         struct rw_semaphore i_mmap_sem;
 995         struct inode vfs_inode;
 996         struct jbd2_inode *jinode;
 997
 998         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
 999
1000         /*
1001          * File creation time. Its function is same as that of
1002          * struct timespec64 i_{a,c,m}time in the generic inode.
1003          */
1004         struct timespec64 i_crtime;
1005
1006         /* mballoc */
1007         struct list_head i_prealloc_list;
1008         spinlock_t i_prealloc_lock;
1009
1010         /* extents status tree */
1011         struct ext4_es_tree i_es_tree;
1012         rwlock_t i_es_lock;
1013         struct list_head i_es_list;
1014         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1015         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1016         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1017                                            extents to shrink. Protected by
1018                                            i_es_lock  */
1019
1020         /* ialloc */
1021         ext4_group_t    i_last_alloc_group;
1022
1023         /* allocation reservation info for delalloc */
1024         /* In case of bigalloc, this refer to clusters rather than blocks */
1025         unsigned int i_reserved_data_blocks;
1026         ext4_lblk_t i_da_metadata_calc_last_lblock;
1027         int i_da_metadata_calc_len;
1028
1029         /* pending cluster reservations for bigalloc file systems */
1030         struct ext4_pending_tree i_pending_tree;
1031
1032         /* on-disk additional length */
1033         __u16 i_extra_isize;
1034
1035         /* Indicate the inline data space. */
1036         u16 i_inline_off;
1037         u16 i_inline_size;
1038
1039 #ifdef CONFIG_QUOTA
1040         /* quota space reservation, managed internally by quota code */
1041         qsize_t i_reserved_quota;
1042 #endif
1043
1044         /* Lock protecting lists below */
1045         spinlock_t i_completed_io_lock;
1046         /*
1047          * Completed IOs that need unwritten extents handling and have
1048          * transaction reserved
1049          */
1050         struct list_head i_rsv_conversion_list;
1051         struct work_struct i_rsv_conversion_work;
1052         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1053
1054         spinlock_t i_block_reservation_lock;
1055
1056         /*
1057          * Transactions that contain inode's metadata needed to complete
1058          * fsync and fdatasync, respectively.
1059          */
1060         tid_t i_sync_tid;
1061         tid_t i_datasync_tid;
1062
1063 #ifdef CONFIG_QUOTA
1064         struct dquot *i_dquot[MAXQUOTAS];
1065 #endif
1066
1067         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1068         __u32 i_csum_seed;
1069
1070         kprojid_t i_projid;
1071 };
1072
1073 /*
1074  * File system states
1075  */
1076 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1077 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1078 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1079
1080 /*
1081  * Misc. filesystem flags
1082  */
1083 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1084 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1085 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1086
1087 /*
1088  * Mount flags set via mount options or defaults
1089  */
1090 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1091 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1092 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1093 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1094 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1095 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1096 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1097 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1098 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1099 #ifdef CONFIG_FS_DAX
1100 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1101 #else
1102 #define EXT4_MOUNT_DAX                  0
1103 #endif
1104 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1105 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1106 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1107 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1108 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1109 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1110 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1111 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1112 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1113 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1114 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1115 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1116                                                  * enable enforcement for hidden
1117                                                  * quota files */
1118 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1119                                                   * enforcement for hidden quota
1120                                                   * files */
1121 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1122                                                   * enforcement */
1123 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1124 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1125 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1126 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1127 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1128 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1129 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1130 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1131 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1132
1133 /*
1134  * Mount flags set either automatically (could not be set by mount option)
1135  * based on per file system feature or property or in special cases such as
1136  * distinguishing between explicit mount option definition and default.
1137  */
1138 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1139                                                       specified delalloc */
1140 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1141                                                       size of blocksize * 8
1142                                                       blocks */
1143 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1144                                                       file systems */
1145
1146 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1147                                                 specified journal checksum */
1148
1149 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1150                                                 ~EXT4_MOUNT_##opt
1151 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1152                                                 EXT4_MOUNT_##opt
1153 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1154                                          EXT4_MOUNT_##opt)
1155
1156 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1157                                                 ~EXT4_MOUNT2_##opt
1158 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1159                                                 EXT4_MOUNT2_##opt
1160 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1161                                          EXT4_MOUNT2_##opt)
1162
1163 #define ext4_test_and_set_bit           __test_and_set_bit_le
1164 #define ext4_set_bit                    __set_bit_le
1165 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1166 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1167 #define ext4_clear_bit                  __clear_bit_le
1168 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1169 #define ext4_test_bit                   test_bit_le
1170 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1171 #define ext4_find_next_bit              find_next_bit_le
1172
1173 extern void ext4_set_bits(void *bm, int cur, int len);
1174
1175 /*
1176  * Maximal mount counts between two filesystem checks
1177  */
1178 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1179 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1180
1181 /*
1182  * Behaviour when detecting errors
1183  */
1184 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1185 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1186 #define EXT4_ERRORS_PANIC               3       /* Panic */
1187 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1188
1189 /* Metadata checksum algorithm codes */
1190 #define EXT4_CRC32C_CHKSUM              1
1191
1192 /*
1193  * Structure of the super block
1194  */
1195 struct ext4_super_block {
1196 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1197         __le32  s_blocks_count_lo;      /* Blocks count */
1198         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1199         __le32  s_free_blocks_count_lo; /* Free blocks count */
1200 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1201         __le32  s_first_data_block;     /* First Data Block */
1202         __le32  s_log_block_size;       /* Block size */
1203         __le32  s_log_cluster_size;     /* Allocation cluster size */
1204 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1205         __le32  s_clusters_per_group;   /* # Clusters per group */
1206         __le32  s_inodes_per_group;     /* # Inodes per group */
1207         __le32  s_mtime;                /* Mount time */
1208 /*30*/  __le32  s_wtime;                /* Write time */
1209         __le16  s_mnt_count;            /* Mount count */
1210         __le16  s_max_mnt_count;        /* Maximal mount count */
1211         __le16  s_magic;                /* Magic signature */
1212         __le16  s_state;                /* File system state */
1213         __le16  s_errors;               /* Behaviour when detecting errors */
1214         __le16  s_minor_rev_level;      /* minor revision level */
1215 /*40*/  __le32  s_lastcheck;            /* time of last check */
1216         __le32  s_checkinterval;        /* max. time between checks */
1217         __le32  s_creator_os;           /* OS */
1218         __le32  s_rev_level;            /* Revision level */
1219 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1220         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1221         /*
1222          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1223          *
1224          * Note: the difference between the compatible feature set and
1225          * the incompatible feature set is that if there is a bit set
1226          * in the incompatible feature set that the kernel doesn't
1227          * know about, it should refuse to mount the filesystem.
1228          *
1229          * e2fsck's requirements are more strict; if it doesn't know
1230          * about a feature in either the compatible or incompatible
1231          * feature set, it must abort and not try to meddle with
1232          * things it doesn't understand...
1233          */
1234         __le32  s_first_ino;            /* First non-reserved inode */
1235         __le16  s_inode_size;           /* size of inode structure */
1236         __le16  s_block_group_nr;       /* block group # of this superblock */
1237         __le32  s_feature_compat;       /* compatible feature set */
1238 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1239         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1240 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1241 /*78*/  char    s_volume_name[16];      /* volume name */
1242 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1243 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1244         /*
1245          * Performance hints.  Directory preallocation should only
1246          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1247          */
1248         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1249         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1250         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1251         /*
1252          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1253          */
1254 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1255 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1256         __le32  s_journal_dev;          /* device number of journal file */
1257         __le32  s_last_orphan;          /* start of list of inodes to delete */
1258         __le32  s_hash_seed[4];         /* HTREE hash seed */
1259         __u8    s_def_hash_version;     /* Default hash version to use */
1260         __u8    s_jnl_backup_type;
1261         __le16  s_desc_size;            /* size of group descriptor */
1262 /*100*/ __le32  s_default_mount_opts;
1263         __le32  s_first_meta_bg;        /* First metablock block group */
1264         __le32  s_mkfs_time;            /* When the filesystem was created */
1265         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1266         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1267 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1268         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1269         __le32  s_free_blocks_count_hi; /* Free blocks count */
1270         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1271         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1272         __le32  s_flags;                /* Miscellaneous flags */
1273         __le16  s_raid_stride;          /* RAID stride */
1274         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1275         __le64  s_mmp_block;            /* Block for multi-mount protection */
1276         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1277         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1278         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1279         __u8    s_encryption_level;     /* versioning level for encryption */
1280         __u8    s_reserved_pad;         /* Padding to next 32bits */
1281         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1282         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1283         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1284         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1285                                               snapshot's future use */
1286         __le32  s_snapshot_list;        /* inode number of the head of the
1287                                            on-disk snapshot list */
1288 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1289         __le32  s_error_count;          /* number of fs errors */
1290         __le32  s_first_error_time;     /* first time an error happened */
1291         __le32  s_first_error_ino;      /* inode involved in first error */
1292         __le64  s_first_error_block;    /* block involved of first error */
1293         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1294         __le32  s_first_error_line;     /* line number where error happened */
1295         __le32  s_last_error_time;      /* most recent time of an error */
1296         __le32  s_last_error_ino;       /* inode involved in last error */
1297         __le32  s_last_error_line;      /* line number where error happened */
1298         __le64  s_last_error_block;     /* block involved of last error */
1299         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1300 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1301         __u8    s_mount_opts[64];
1302         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1303         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1304         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1305         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1306         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1307         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1308         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1309         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1310         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1311         __u8    s_wtime_hi;
1312         __u8    s_mtime_hi;
1313         __u8    s_mkfs_time_hi;
1314         __u8    s_lastcheck_hi;
1315         __u8    s_first_error_time_hi;
1316         __u8    s_last_error_time_hi;
1317         __u8    s_pad[2];
1318         __le16  s_encoding;             /* Filename charset encoding */
1319         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1320         __le32  s_reserved[95];         /* Padding to the end of the block */
1321         __le32  s_checksum;             /* crc32c(superblock) */
1322 };
1323
1324 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1325
1326 #ifdef __KERNEL__
1327
1328 /*
1329  * run-time mount flags
1330  */
1331 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1332 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1333 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1334
1335 #ifdef CONFIG_FS_ENCRYPTION
1336 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1337                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1338 #else
1339 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1340 #endif
1341
1342 /* Number of quota types we support */
1343 #define EXT4_MAXQUOTAS 3
1344
1345 #define EXT4_ENC_UTF8_12_1      1
1346
1347 /*
1348  * Flags for ext4_sb_info.s_encoding_flags.
1349  */
1350 #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1351
1352 #define ext4_has_strict_mode(sbi) \
1353         (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
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 **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 #ifdef CONFIG_UNICODE
1405         struct unicode_map *s_encoding;
1406         __u16 s_encoding_flags;
1407 #endif
1408
1409         /* Journaling */
1410         struct journal_s *s_journal;
1411         struct list_head s_orphan;
1412         struct mutex s_orphan_lock;
1413         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1414         unsigned long s_commit_interval;
1415         u32 s_max_batch_time;
1416         u32 s_min_batch_time;
1417         struct block_device *journal_bdev;
1418 #ifdef CONFIG_QUOTA
1419         /* Names of quota files with journalled quota */
1420         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1421         int s_jquota_fmt;                       /* Format of quota to use */
1422 #endif
1423         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1424         struct rb_root system_blks;
1425
1426 #ifdef EXTENTS_STATS
1427         /* ext4 extents stats */
1428         unsigned long s_ext_min;
1429         unsigned long s_ext_max;
1430         unsigned long s_depth_max;
1431         spinlock_t s_ext_stats_lock;
1432         unsigned long s_ext_blocks;
1433         unsigned long s_ext_extents;
1434 #endif
1435
1436         /* for buddy allocator */
1437         struct ext4_group_info ***s_group_info;
1438         struct inode *s_buddy_cache;
1439         spinlock_t s_md_lock;
1440         unsigned short *s_mb_offsets;
1441         unsigned int *s_mb_maxs;
1442         unsigned int s_group_info_size;
1443         unsigned int s_mb_free_pending;
1444         struct list_head s_freed_data_list;     /* List of blocks to be freed
1445                                                    after commit completed */
1446
1447         /* tunables */
1448         unsigned long s_stripe;
1449         unsigned int s_mb_stream_request;
1450         unsigned int s_mb_max_to_scan;
1451         unsigned int s_mb_min_to_scan;
1452         unsigned int s_mb_stats;
1453         unsigned int s_mb_order2_reqs;
1454         unsigned int s_mb_group_prealloc;
1455         unsigned int s_max_dir_size_kb;
1456         /* where last allocation was done - for stream allocation */
1457         unsigned long s_mb_last_group;
1458         unsigned long s_mb_last_start;
1459
1460         /* stats for buddy allocator */
1461         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1462         atomic_t s_bal_success; /* we found long enough chunks */
1463         atomic_t s_bal_allocated;       /* in blocks */
1464         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1465         atomic_t s_bal_goals;   /* goal hits */
1466         atomic_t s_bal_breaks;  /* too long searches */
1467         atomic_t s_bal_2orders; /* 2^order hits */
1468         spinlock_t s_bal_lock;
1469         unsigned long s_mb_buddies_generated;
1470         unsigned long long s_mb_generation_time;
1471         atomic_t s_mb_lost_chunks;
1472         atomic_t s_mb_preallocated;
1473         atomic_t s_mb_discarded;
1474         atomic_t s_lock_busy;
1475
1476         /* locality groups */
1477         struct ext4_locality_group __percpu *s_locality_groups;
1478
1479         /* for write statistics */
1480         unsigned long s_sectors_written_start;
1481         u64 s_kbytes_written;
1482
1483         /* the size of zero-out chunk */
1484         unsigned int s_extent_max_zeroout_kb;
1485
1486         unsigned int s_log_groups_per_flex;
1487         struct flex_groups *s_flex_groups;
1488         ext4_group_t s_flex_groups_allocated;
1489
1490         /* workqueue for reserved extent conversions (buffered io) */
1491         struct workqueue_struct *rsv_conversion_wq;
1492
1493         /* timer for periodic error stats printing */
1494         struct timer_list s_err_report;
1495
1496         /* Lazy inode table initialization info */
1497         struct ext4_li_request *s_li_request;
1498         /* Wait multiplier for lazy initialization thread */
1499         unsigned int s_li_wait_mult;
1500
1501         /* Kernel thread for multiple mount protection */
1502         struct task_struct *s_mmp_tsk;
1503
1504         /* record the last minlen when FITRIM is called. */
1505         atomic_t s_last_trim_minblks;
1506
1507         /* Reference to checksum algorithm driver via cryptoapi */
1508         struct crypto_shash *s_chksum_driver;
1509
1510         /* Precomputed FS UUID checksum for seeding other checksums */
1511         __u32 s_csum_seed;
1512
1513         /* Reclaim extents from extent status tree */
1514         struct shrinker s_es_shrinker;
1515         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1516         long s_es_nr_inode;
1517         struct ext4_es_stats s_es_stats;
1518         struct mb_cache *s_ea_block_cache;
1519         struct mb_cache *s_ea_inode_cache;
1520         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1521
1522         /* Ratelimit ext4 messages. */
1523         struct ratelimit_state s_err_ratelimit_state;
1524         struct ratelimit_state s_warning_ratelimit_state;
1525         struct ratelimit_state s_msg_ratelimit_state;
1526
1527         /* Barrier between changing inodes' journal flags and writepages ops. */
1528         struct percpu_rw_semaphore s_journal_flag_rwsem;
1529         struct dax_device *s_daxdev;
1530 };
1531
1532 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1533 {
1534         return sb->s_fs_info;
1535 }
1536 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1537 {
1538         return container_of(inode, struct ext4_inode_info, vfs_inode);
1539 }
1540
1541 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1542 {
1543         return ino == EXT4_ROOT_INO ||
1544                 (ino >= EXT4_FIRST_INO(sb) &&
1545                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1546 }
1547
1548 /*
1549  * Inode dynamic state flags
1550  */
1551 enum {
1552         EXT4_STATE_JDATA,               /* journaled data exists */
1553         EXT4_STATE_NEW,                 /* inode is newly created */
1554         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1555         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1556         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1557         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1558         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1559         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1560         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1561         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1562         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1563 };
1564
1565 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1566 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1567 {                                                                       \
1568         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1569 }                                                                       \
1570 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1571 {                                                                       \
1572         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1573 }                                                                       \
1574 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1575 {                                                                       \
1576         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1577 }
1578
1579 /* Add these declarations here only so that these functions can be
1580  * found by name.  Otherwise, they are very hard to locate. */
1581 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1582 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1583 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1584 EXT4_INODE_BIT_FNS(flag, flags, 0)
1585
1586 /* Add these declarations here only so that these functions can be
1587  * found by name.  Otherwise, they are very hard to locate. */
1588 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1589 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1590 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1591 #if (BITS_PER_LONG < 64)
1592 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1593
1594 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1595 {
1596         (ei)->i_state_flags = 0;
1597 }
1598 #else
1599 EXT4_INODE_BIT_FNS(state, flags, 32)
1600
1601 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1602 {
1603         /* We depend on the fact that callers will set i_flags */
1604 }
1605 #endif
1606 #else
1607 /* Assume that user mode programs are passing in an ext4fs superblock, not
1608  * a kernel struct super_block.  This will allow us to call the feature-test
1609  * macros from user land. */
1610 #define EXT4_SB(sb)     (sb)
1611 #endif
1612
1613 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1614
1615 /*
1616  * Codes for operating systems
1617  */
1618 #define EXT4_OS_LINUX           0
1619 #define EXT4_OS_HURD            1
1620 #define EXT4_OS_MASIX           2
1621 #define EXT4_OS_FREEBSD         3
1622 #define EXT4_OS_LITES           4
1623
1624 /*
1625  * Revision levels
1626  */
1627 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1628 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1629
1630 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1631 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1632
1633 #define EXT4_GOOD_OLD_INODE_SIZE 128
1634
1635 /*
1636  * Feature set definitions
1637  */
1638
1639 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1640 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1641 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1642 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1643 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1644 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1645 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1646
1647 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1648 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1649 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1650 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1651 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1652 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1653 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1654 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1655 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1656 /*
1657  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1658  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1659  * all other data structures' checksums.  However, the METADATA_CSUM and
1660  * GDT_CSUM bits are mutually exclusive.
1661  */
1662 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1663 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1664 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1665
1666 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1667 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1668 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1669 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1670 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1671 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1672 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1673 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1674 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1675 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1676 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1677 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1678 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1679 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1680 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1681 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1682
1683 extern void ext4_update_dynamic_rev(struct super_block *sb);
1684
1685 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1686 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1687 { \
1688         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1689                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1690 } \
1691 static inline void ext4_set_feature_##name(struct super_block *sb) \
1692 { \
1693         ext4_update_dynamic_rev(sb); \
1694         EXT4_SB(sb)->s_es->s_feature_compat |= \
1695                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1696 } \
1697 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1698 { \
1699         EXT4_SB(sb)->s_es->s_feature_compat &= \
1700                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1701 }
1702
1703 #define EXT4_FEATURE_RO_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_ro_compat & \
1707                 cpu_to_le32(EXT4_FEATURE_RO_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_ro_compat |= \
1713                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1714 } \
1715 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1716 { \
1717         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1718                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1719 }
1720
1721 #define EXT4_FEATURE_INCOMPAT_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_incompat & \
1725                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##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_incompat |= \
1731                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1732 } \
1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1734 { \
1735         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1736                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1737 }
1738
1739 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1740 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1741 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1742 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1743 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1744 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1745 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1746
1747 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1748 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1749 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1750 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1751 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1752 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1753 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1754 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1755 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1756 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1757 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1758 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1759
1760 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1761 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1762 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1763 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1764 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1765 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1766 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1767 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1768 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1769 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1770 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1771 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1772 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1773 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1774 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1775 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
1776
1777 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1778 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1779                                          EXT4_FEATURE_INCOMPAT_META_BG)
1780 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1781                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1782                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1783
1784 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1785 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1786                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1787                                          EXT4_FEATURE_INCOMPAT_META_BG)
1788 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1789                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1790                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1791
1792 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1793 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1794                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1795                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1796                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1797                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1798                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1799                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1800                                          EXT4_FEATURE_INCOMPAT_MMP | \
1801                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1802                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1803                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1804                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1805                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1806 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1807                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1808                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1809                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1810                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1811                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1812                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1813                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1814                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1815                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1816                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1817
1818 #define EXTN_FEATURE_FUNCS(ver) \
1819 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1820 { \
1821         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1822                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1823 } \
1824 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1825 { \
1826         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1827                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1828 } \
1829 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1830 { \
1831         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1832                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1833 }
1834
1835 EXTN_FEATURE_FUNCS(2)
1836 EXTN_FEATURE_FUNCS(3)
1837 EXTN_FEATURE_FUNCS(4)
1838
1839 static inline bool ext4_has_compat_features(struct super_block *sb)
1840 {
1841         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1842 }
1843 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1844 {
1845         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1846 }
1847 static inline bool ext4_has_incompat_features(struct super_block *sb)
1848 {
1849         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1850 }
1851
1852 /*
1853  * Superblock flags
1854  */
1855 #define EXT4_FLAGS_RESIZING     0
1856 #define EXT4_FLAGS_SHUTDOWN     1
1857
1858 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1859 {
1860         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1861 }
1862
1863
1864 /*
1865  * Default values for user and/or group using reserved blocks
1866  */
1867 #define EXT4_DEF_RESUID         0
1868 #define EXT4_DEF_RESGID         0
1869
1870 /*
1871  * Default project ID
1872  */
1873 #define EXT4_DEF_PROJID         0
1874
1875 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1876
1877 /*
1878  * Default mount options
1879  */
1880 #define EXT4_DEFM_DEBUG         0x0001
1881 #define EXT4_DEFM_BSDGROUPS     0x0002
1882 #define EXT4_DEFM_XATTR_USER    0x0004
1883 #define EXT4_DEFM_ACL           0x0008
1884 #define EXT4_DEFM_UID16         0x0010
1885 #define EXT4_DEFM_JMODE         0x0060
1886 #define EXT4_DEFM_JMODE_DATA    0x0020
1887 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1888 #define EXT4_DEFM_JMODE_WBACK   0x0060
1889 #define EXT4_DEFM_NOBARRIER     0x0100
1890 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1891 #define EXT4_DEFM_DISCARD       0x0400
1892 #define EXT4_DEFM_NODELALLOC    0x0800
1893
1894 /*
1895  * Default journal batch times
1896  */
1897 #define EXT4_DEF_MIN_BATCH_TIME 0
1898 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1899
1900 /*
1901  * Minimum number of groups in a flexgroup before we separate out
1902  * directories into the first block group of a flexgroup
1903  */
1904 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1905
1906 /*
1907  * Structure of a directory entry
1908  */
1909 #define EXT4_NAME_LEN 255
1910
1911 struct ext4_dir_entry {
1912         __le32  inode;                  /* Inode number */
1913         __le16  rec_len;                /* Directory entry length */
1914         __le16  name_len;               /* Name length */
1915         char    name[EXT4_NAME_LEN];    /* File name */
1916 };
1917
1918 /*
1919  * The new version of the directory entry.  Since EXT4 structures are
1920  * stored in intel byte order, and the name_len field could never be
1921  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1922  * file_type field.
1923  */
1924 struct ext4_dir_entry_2 {
1925         __le32  inode;                  /* Inode number */
1926         __le16  rec_len;                /* Directory entry length */
1927         __u8    name_len;               /* Name length */
1928         __u8    file_type;
1929         char    name[EXT4_NAME_LEN];    /* File name */
1930 };
1931
1932 /*
1933  * This is a bogus directory entry at the end of each leaf block that
1934  * records checksums.
1935  */
1936 struct ext4_dir_entry_tail {
1937         __le32  det_reserved_zero1;     /* Pretend to be unused */
1938         __le16  det_rec_len;            /* 12 */
1939         __u8    det_reserved_zero2;     /* Zero name length */
1940         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1941         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1942 };
1943
1944 #define EXT4_DIRENT_TAIL(block, blocksize) \
1945         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1946                                         ((blocksize) - \
1947                                          sizeof(struct ext4_dir_entry_tail))))
1948
1949 /*
1950  * Ext4 directory file types.  Only the low 3 bits are used.  The
1951  * other bits are reserved for now.
1952  */
1953 #define EXT4_FT_UNKNOWN         0
1954 #define EXT4_FT_REG_FILE        1
1955 #define EXT4_FT_DIR             2
1956 #define EXT4_FT_CHRDEV          3
1957 #define EXT4_FT_BLKDEV          4
1958 #define EXT4_FT_FIFO            5
1959 #define EXT4_FT_SOCK            6
1960 #define EXT4_FT_SYMLINK         7
1961
1962 #define EXT4_FT_MAX             8
1963
1964 #define EXT4_FT_DIR_CSUM        0xDE
1965
1966 /*
1967  * EXT4_DIR_PAD defines the directory entries boundaries
1968  *
1969  * NOTE: It must be a multiple of 4
1970  */
1971 #define EXT4_DIR_PAD                    4
1972 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1973 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1974                                          ~EXT4_DIR_ROUND)
1975 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1976
1977 /*
1978  * If we ever get support for fs block sizes > page_size, we'll need
1979  * to remove the #if statements in the next two functions...
1980  */
1981 static inline unsigned int
1982 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1983 {
1984         unsigned len = le16_to_cpu(dlen);
1985
1986 #if (PAGE_SIZE >= 65536)
1987         if (len == EXT4_MAX_REC_LEN || len == 0)
1988                 return blocksize;
1989         return (len & 65532) | ((len & 3) << 16);
1990 #else
1991         return len;
1992 #endif
1993 }
1994
1995 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1996 {
1997         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1998                 BUG();
1999 #if (PAGE_SIZE >= 65536)
2000         if (len < 65536)
2001                 return cpu_to_le16(len);
2002         if (len == blocksize) {
2003                 if (blocksize == 65536)
2004                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2005                 else
2006                         return cpu_to_le16(0);
2007         }
2008         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2009 #else
2010         return cpu_to_le16(len);
2011 #endif
2012 }
2013
2014 /*
2015  * Hash Tree Directory indexing
2016  * (c) Daniel Phillips, 2001
2017  */
2018
2019 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2020                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2021 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2022                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2023 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2024
2025 /* Legal values for the dx_root hash_version field: */
2026
2027 #define DX_HASH_LEGACY                  0
2028 #define DX_HASH_HALF_MD4                1
2029 #define DX_HASH_TEA                     2
2030 #define DX_HASH_LEGACY_UNSIGNED         3
2031 #define DX_HASH_HALF_MD4_UNSIGNED       4
2032 #define DX_HASH_TEA_UNSIGNED            5
2033
2034 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2035                               const void *address, unsigned int length)
2036 {
2037         struct {
2038                 struct shash_desc shash;
2039                 char ctx[4];
2040         } desc;
2041
2042         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2043
2044         desc.shash.tfm = sbi->s_chksum_driver;
2045         *(u32 *)desc.ctx = crc;
2046
2047         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2048
2049         return *(u32 *)desc.ctx;
2050 }
2051
2052 #ifdef __KERNEL__
2053
2054 /* hash info structure used by the directory hash */
2055 struct dx_hash_info
2056 {
2057         u32             hash;
2058         u32             minor_hash;
2059         int             hash_version;
2060         u32             *seed;
2061 };
2062
2063
2064 /* 32 and 64 bit signed EOF for dx directories */
2065 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2066 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2067
2068
2069 /*
2070  * Control parameters used by ext4_htree_next_block
2071  */
2072 #define HASH_NB_ALWAYS          1
2073
2074 struct ext4_filename {
2075         const struct qstr *usr_fname;
2076         struct fscrypt_str disk_name;
2077         struct dx_hash_info hinfo;
2078 #ifdef CONFIG_FS_ENCRYPTION
2079         struct fscrypt_str crypto_buf;
2080 #endif
2081 #ifdef CONFIG_UNICODE
2082         struct fscrypt_str cf_name;
2083 #endif
2084 };
2085
2086 #define fname_name(p) ((p)->disk_name.name)
2087 #define fname_len(p)  ((p)->disk_name.len)
2088
2089 /*
2090  * Describe an inode's exact location on disk and in memory
2091  */
2092 struct ext4_iloc
2093 {
2094         struct buffer_head *bh;
2095         unsigned long offset;
2096         ext4_group_t block_group;
2097 };
2098
2099 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2100 {
2101         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2102 }
2103
2104 static inline bool ext4_is_quota_file(struct inode *inode)
2105 {
2106         return IS_NOQUOTA(inode) &&
2107                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2108 }
2109
2110 /*
2111  * This structure is stuffed into the struct file's private_data field
2112  * for directories.  It is where we put information so that we can do
2113  * readdir operations in hash tree order.
2114  */
2115 struct dir_private_info {
2116         struct rb_root  root;
2117         struct rb_node  *curr_node;
2118         struct fname    *extra_fname;
2119         loff_t          last_pos;
2120         __u32           curr_hash;
2121         __u32           curr_minor_hash;
2122         __u32           next_hash;
2123 };
2124
2125 /* calculate the first block number of the group */
2126 static inline ext4_fsblk_t
2127 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2128 {
2129         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2130                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2131 }
2132
2133 /*
2134  * Special error return code only used by dx_probe() and its callers.
2135  */
2136 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2137
2138 /* htree levels for ext4 */
2139 #define EXT4_HTREE_LEVEL_COMPAT 2
2140 #define EXT4_HTREE_LEVEL        3
2141
2142 static inline int ext4_dir_htree_level(struct super_block *sb)
2143 {
2144         return ext4_has_feature_largedir(sb) ?
2145                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2146 }
2147
2148 /*
2149  * Timeout and state flag for lazy initialization inode thread.
2150  */
2151 #define EXT4_DEF_LI_WAIT_MULT                   10
2152 #define EXT4_DEF_LI_MAX_START_DELAY             5
2153 #define EXT4_LAZYINIT_QUIT                      0x0001
2154 #define EXT4_LAZYINIT_RUNNING                   0x0002
2155
2156 /*
2157  * Lazy inode table initialization info
2158  */
2159 struct ext4_lazy_init {
2160         unsigned long           li_state;
2161         struct list_head        li_request_list;
2162         struct mutex            li_list_mtx;
2163 };
2164
2165 struct ext4_li_request {
2166         struct super_block      *lr_super;
2167         struct ext4_sb_info     *lr_sbi;
2168         ext4_group_t            lr_next_group;
2169         struct list_head        lr_request;
2170         unsigned long           lr_next_sched;
2171         unsigned long           lr_timeout;
2172 };
2173
2174 struct ext4_features {
2175         struct kobject f_kobj;
2176         struct completion f_kobj_unregister;
2177 };
2178
2179 /*
2180  * This structure will be used for multiple mount protection. It will be
2181  * written into the block number saved in the s_mmp_block field in the
2182  * superblock. Programs that check MMP should assume that if
2183  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2184  * to use the filesystem, regardless of how old the timestamp is.
2185  */
2186 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2187 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2188 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2189 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2190
2191 struct mmp_struct {
2192         __le32  mmp_magic;              /* Magic number for MMP */
2193         __le32  mmp_seq;                /* Sequence no. updated periodically */
2194
2195         /*
2196          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2197          * purposes and do not affect the correctness of the algorithm
2198          */
2199         __le64  mmp_time;               /* Time last updated */
2200         char    mmp_nodename[64];       /* Node which last updated MMP block */
2201         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2202
2203         /*
2204          * mmp_check_interval is used to verify if the MMP block has been
2205          * updated on the block device. The value is updated based on the
2206          * maximum time to write the MMP block during an update cycle.
2207          */
2208         __le16  mmp_check_interval;
2209
2210         __le16  mmp_pad1;
2211         __le32  mmp_pad2[226];
2212         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2213 };
2214
2215 /* arguments passed to the mmp thread */
2216 struct mmpd_data {
2217         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2218         struct super_block *sb;  /* super block of the fs */
2219 };
2220
2221 /*
2222  * Check interval multiplier
2223  * The MMP block is written every update interval and initially checked every
2224  * update interval x the multiplier (the value is then adapted based on the
2225  * write latency). The reason is that writes can be delayed under load and we
2226  * don't want readers to incorrectly assume that the filesystem is no longer
2227  * in use.
2228  */
2229 #define EXT4_MMP_CHECK_MULT             2UL
2230
2231 /*
2232  * Minimum interval for MMP checking in seconds.
2233  */
2234 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2235
2236 /*
2237  * Maximum interval for MMP checking in seconds.
2238  */
2239 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2240
2241 /*
2242  * Function prototypes
2243  */
2244
2245 /*
2246  * Ok, these declarations are also in <linux/kernel.h> but none of the
2247  * ext4 source programs needs to include it so they are duplicated here.
2248  */
2249 # define NORET_TYPE     /**/
2250 # define ATTRIB_NORET   __attribute__((noreturn))
2251 # define NORET_AND      noreturn,
2252
2253 /* bitmap.c */
2254 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2255 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2256                                 struct ext4_group_desc *gdp,
2257                                 struct buffer_head *bh, int sz);
2258 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2259                                   struct ext4_group_desc *gdp,
2260                                   struct buffer_head *bh, int sz);
2261 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2262                                 struct ext4_group_desc *gdp,
2263                                 struct buffer_head *bh);
2264 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2265                                   struct ext4_group_desc *gdp,
2266                                   struct buffer_head *bh);
2267
2268 /* balloc.c */
2269 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2270                                          ext4_fsblk_t blocknr,
2271                                          ext4_group_t *blockgrpp,
2272                                          ext4_grpblk_t *offsetp);
2273 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2274                                           ext4_fsblk_t block);
2275
2276 extern unsigned int ext4_block_group(struct super_block *sb,
2277                         ext4_fsblk_t blocknr);
2278 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2279                         ext4_fsblk_t blocknr);
2280 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2281 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2282                         ext4_group_t group);
2283 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2284                                          ext4_fsblk_t goal,
2285                                          unsigned int flags,
2286                                          unsigned long *count,
2287                                          int *errp);
2288 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2289                                     s64 nclusters, unsigned int flags);
2290 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2291 extern void ext4_check_blocks_bitmap(struct super_block *);
2292 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2293                                                     ext4_group_t block_group,
2294                                                     struct buffer_head ** bh);
2295 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2296
2297 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2298                                                 ext4_group_t block_group);
2299 extern int ext4_wait_block_bitmap(struct super_block *sb,
2300                                   ext4_group_t block_group,
2301                                   struct buffer_head *bh);
2302 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2303                                                   ext4_group_t block_group);
2304 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2305                                               ext4_group_t block_group,
2306                                               struct ext4_group_desc *gdp);
2307 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2308
2309 #ifdef CONFIG_UNICODE
2310 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2311                                          const struct qstr *iname,
2312                                          struct fscrypt_str *fname);
2313 #endif
2314
2315 #ifdef CONFIG_FS_ENCRYPTION
2316 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2317                                                 const struct fscrypt_name *src)
2318 {
2319         memset(dst, 0, sizeof(*dst));
2320
2321         dst->usr_fname = src->usr_fname;
2322         dst->disk_name = src->disk_name;
2323         dst->hinfo.hash = src->hash;
2324         dst->hinfo.minor_hash = src->minor_hash;
2325         dst->crypto_buf = src->crypto_buf;
2326 }
2327
2328 static inline int ext4_fname_setup_filename(struct inode *dir,
2329                                             const struct qstr *iname,
2330                                             int lookup,
2331                                             struct ext4_filename *fname)
2332 {
2333         struct fscrypt_name name;
2334         int err;
2335
2336         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2337         if (err)
2338                 return err;
2339
2340         ext4_fname_from_fscrypt_name(fname, &name);
2341
2342 #ifdef CONFIG_UNICODE
2343         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2344 #endif
2345         return 0;
2346 }
2347
2348 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2349                                             struct dentry *dentry,
2350                                             struct ext4_filename *fname)
2351 {
2352         struct fscrypt_name name;
2353         int err;
2354
2355         err = fscrypt_prepare_lookup(dir, dentry, &name);
2356         if (err)
2357                 return err;
2358
2359         ext4_fname_from_fscrypt_name(fname, &name);
2360
2361 #ifdef CONFIG_UNICODE
2362         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2363 #endif
2364         return 0;
2365 }
2366
2367 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2368 {
2369         struct fscrypt_name name;
2370
2371         name.crypto_buf = fname->crypto_buf;
2372         fscrypt_free_filename(&name);
2373
2374         fname->crypto_buf.name = NULL;
2375         fname->usr_fname = NULL;
2376         fname->disk_name.name = NULL;
2377
2378 #ifdef CONFIG_UNICODE
2379         kfree(fname->cf_name.name);
2380         fname->cf_name.name = NULL;
2381 #endif
2382 }
2383 #else /* !CONFIG_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
2393 #ifdef CONFIG_UNICODE
2394         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2395 #endif
2396
2397         return 0;
2398 }
2399
2400 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2401                                             struct dentry *dentry,
2402                                             struct ext4_filename *fname)
2403 {
2404         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2405 }
2406
2407 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2408 {
2409 #ifdef CONFIG_UNICODE
2410         kfree(fname->cf_name.name);
2411         fname->cf_name.name = NULL;
2412 #endif
2413 }
2414 #endif /* !CONFIG_FS_ENCRYPTION */
2415
2416 /* dir.c */
2417 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2418                                   struct file *,
2419                                   struct ext4_dir_entry_2 *,
2420                                   struct buffer_head *, char *, int,
2421                                   unsigned int);
2422 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2423         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2424                                         (de), (bh), (buf), (size), (offset)))
2425 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2426                                 __u32 minor_hash,
2427                                 struct ext4_dir_entry_2 *dirent,
2428                                 struct fscrypt_str *ent_name);
2429 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2430 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2431                              struct buffer_head *bh,
2432                              void *buf, int buf_size,
2433                              struct ext4_filename *fname,
2434                              struct ext4_dir_entry_2 **dest_de);
2435 void ext4_insert_dentry(struct inode *inode,
2436                         struct ext4_dir_entry_2 *de,
2437                         int buf_size,
2438                         struct ext4_filename *fname);
2439 static inline void ext4_update_dx_flag(struct inode *inode)
2440 {
2441         if (!ext4_has_feature_dir_index(inode->i_sb))
2442                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2443 }
2444 static const unsigned char ext4_filetype_table[] = {
2445         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2446 };
2447
2448 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2449 {
2450         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2451                 return DT_UNKNOWN;
2452
2453         return ext4_filetype_table[filetype];
2454 }
2455 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2456                              void *buf, int buf_size);
2457
2458 /* fsync.c */
2459 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2460
2461 /* hash.c */
2462 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2463                           struct dx_hash_info *hinfo);
2464
2465 /* ialloc.c */
2466 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2467                                       const struct qstr *qstr, __u32 goal,
2468                                       uid_t *owner, __u32 i_flags,
2469                                       int handle_type, unsigned int line_no,
2470                                       int nblocks);
2471
2472 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2473         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2474                          i_flags, 0, 0, 0)
2475 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2476                                     type, nblocks)                  \
2477         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2478                          0, (type), __LINE__, (nblocks))
2479
2480
2481 extern void ext4_free_inode(handle_t *, struct inode *);
2482 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2483 extern unsigned long ext4_count_free_inodes(struct super_block *);
2484 extern unsigned long ext4_count_dirs(struct super_block *);
2485 extern void ext4_check_inodes_bitmap(struct super_block *);
2486 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2487 extern int ext4_init_inode_table(struct super_block *sb,
2488                                  ext4_group_t group, int barrier);
2489 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2490
2491 /* mballoc.c */
2492 extern const struct seq_operations ext4_mb_seq_groups_ops;
2493 extern long ext4_mb_stats;
2494 extern long ext4_mb_max_to_scan;
2495 extern int ext4_mb_init(struct super_block *);
2496 extern int ext4_mb_release(struct super_block *);
2497 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2498                                 struct ext4_allocation_request *, int *);
2499 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2500 extern void ext4_discard_preallocations(struct inode *);
2501 extern int __init ext4_init_mballoc(void);
2502 extern void ext4_exit_mballoc(void);
2503 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2504                              struct buffer_head *bh, ext4_fsblk_t block,
2505                              unsigned long count, int flags);
2506 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2507                                    ext4_group_t ngroups);
2508 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2509                 ext4_group_t i, struct ext4_group_desc *desc);
2510 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2511                                 ext4_fsblk_t block, unsigned long count);
2512 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2513 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2514
2515 /* inode.c */
2516 int ext4_inode_is_fast_symlink(struct inode *inode);
2517 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2518 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2519 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2520                      bool wait, struct buffer_head **bhs);
2521 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2522                              struct buffer_head *bh_result, int create);
2523 int ext4_get_block(struct inode *inode, sector_t iblock,
2524                    struct buffer_head *bh_result, int create);
2525 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2526                        struct buffer_head *bh_result, int create);
2527 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2528                            struct buffer_head *bh, int create);
2529 int ext4_walk_page_buffers(handle_t *handle,
2530                            struct buffer_head *head,
2531                            unsigned from,
2532                            unsigned to,
2533                            int *partial,
2534                            int (*fn)(handle_t *handle,
2535                                      struct buffer_head *bh));
2536 int do_journal_get_write_access(handle_t *handle,
2537                                 struct buffer_head *bh);
2538 #define FALL_BACK_TO_NONDELALLOC 1
2539 #define CONVERT_INLINE_DATA      2
2540
2541 typedef enum {
2542         EXT4_IGET_NORMAL =      0,
2543         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2544         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2545 } ext4_iget_flags;
2546
2547 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2548                                  ext4_iget_flags flags, const char *function,
2549                                  unsigned int line);
2550
2551 #define ext4_iget(sb, ino, flags) \
2552         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2553
2554 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2555 extern int  ext4_setattr(struct dentry *, struct iattr *);
2556 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2557 extern void ext4_evict_inode(struct inode *);
2558 extern void ext4_clear_inode(struct inode *);
2559 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2560 extern int  ext4_sync_inode(handle_t *, struct inode *);
2561 extern void ext4_dirty_inode(struct inode *, int);
2562 extern int ext4_change_inode_journal_flag(struct inode *, int);
2563 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2564 extern int ext4_inode_attach_jinode(struct inode *inode);
2565 extern int ext4_can_truncate(struct inode *inode);
2566 extern int ext4_truncate(struct inode *);
2567 extern int ext4_break_layouts(struct inode *);
2568 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2569 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2570 extern void ext4_set_inode_flags(struct inode *);
2571 extern int ext4_alloc_da_blocks(struct inode *inode);
2572 extern void ext4_set_aops(struct inode *inode);
2573 extern int ext4_writepage_trans_blocks(struct inode *);
2574 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2575 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2576                              loff_t lstart, loff_t lend);
2577 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2578 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2579 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2580 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2581 extern void ext4_da_release_space(struct inode *inode, int to_free);
2582 extern void ext4_da_update_reserve_space(struct inode *inode,
2583                                         int used, int quota_claim);
2584 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2585                               ext4_fsblk_t pblk, ext4_lblk_t len);
2586
2587 /* indirect.c */
2588 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2589                                 struct ext4_map_blocks *map, int flags);
2590 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2591 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2592 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2593 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2594                                  ext4_lblk_t start, ext4_lblk_t end);
2595
2596 /* ioctl.c */
2597 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2598 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2599
2600 /* migrate.c */
2601 extern int ext4_ext_migrate(struct inode *);
2602 extern int ext4_ind_migrate(struct inode *inode);
2603
2604 /* namei.c */
2605 extern int ext4_dirblock_csum_verify(struct inode *inode,
2606                                      struct buffer_head *bh);
2607 extern int ext4_orphan_add(handle_t *, struct inode *);
2608 extern int ext4_orphan_del(handle_t *, struct inode *);
2609 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2610                                 __u32 start_minor_hash, __u32 *next_hash);
2611 extern int ext4_search_dir(struct buffer_head *bh,
2612                            char *search_buf,
2613                            int buf_size,
2614                            struct inode *dir,
2615                            struct ext4_filename *fname,
2616                            unsigned int offset,
2617                            struct ext4_dir_entry_2 **res_dir);
2618 extern int ext4_generic_delete_entry(handle_t *handle,
2619                                      struct inode *dir,
2620                                      struct ext4_dir_entry_2 *de_del,
2621                                      struct buffer_head *bh,
2622                                      void *entry_buf,
2623                                      int buf_size,
2624                                      int csum_size);
2625 extern bool ext4_empty_dir(struct inode *inode);
2626
2627 /* resize.c */
2628 extern int ext4_group_add(struct super_block *sb,
2629                                 struct ext4_new_group_data *input);
2630 extern int ext4_group_extend(struct super_block *sb,
2631                                 struct ext4_super_block *es,
2632                                 ext4_fsblk_t n_blocks_count);
2633 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2634
2635 /* super.c */
2636 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2637                                          sector_t block, int op_flags);
2638 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2639 extern int ext4_calculate_overhead(struct super_block *sb);
2640 extern void ext4_superblock_csum_set(struct super_block *sb);
2641 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2642 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2643 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2644                                     ext4_group_t ngroup);
2645 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2646                                      char nbuf[16]);
2647 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2648                                              ext4_group_t block_group,
2649                                              unsigned int flags);
2650
2651 extern __printf(4, 5)
2652 void __ext4_error(struct super_block *, const char *, unsigned int,
2653                   const char *, ...);
2654 extern __printf(5, 6)
2655 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2656                       const char *, ...);
2657 extern __printf(5, 6)
2658 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2659                      const char *, ...);
2660 extern void __ext4_std_error(struct super_block *, const char *,
2661                              unsigned int, int);
2662 extern __printf(4, 5)
2663 void __ext4_abort(struct super_block *, const char *, unsigned int,
2664                   const char *, ...);
2665 extern __printf(4, 5)
2666 void __ext4_warning(struct super_block *, const char *, unsigned int,
2667                     const char *, ...);
2668 extern __printf(4, 5)
2669 void __ext4_warning_inode(const struct inode *inode, const char *function,
2670                           unsigned int line, const char *fmt, ...);
2671 extern __printf(3, 4)
2672 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2673 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2674                            const char *, unsigned int, const char *);
2675 extern __printf(7, 8)
2676 void __ext4_grp_locked_error(const char *, unsigned int,
2677                              struct super_block *, ext4_group_t,
2678                              unsigned long, ext4_fsblk_t,
2679                              const char *, ...);
2680
2681 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2682         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2683
2684 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2685         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2686
2687 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2688         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2689
2690 #ifdef CONFIG_PRINTK
2691
2692 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2693         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2694 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2695         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2696 #define ext4_error(sb, fmt, ...)                                        \
2697         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2698 #define ext4_abort(sb, fmt, ...)                                        \
2699         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2700 #define ext4_warning(sb, fmt, ...)                                      \
2701         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2702 #define ext4_warning_inode(inode, fmt, ...)                             \
2703         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2704 #define ext4_msg(sb, level, fmt, ...)                           \
2705         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2706 #define dump_mmp_msg(sb, mmp, msg)                                      \
2707         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2708 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2709         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2710                                 fmt, ##__VA_ARGS__)
2711
2712 #else
2713
2714 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2715 do {                                                                    \
2716         no_printk(fmt, ##__VA_ARGS__);                                  \
2717         __ext4_error_inode(inode, "", 0, block, " ");                   \
2718 } while (0)
2719 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2720 do {                                                                    \
2721         no_printk(fmt, ##__VA_ARGS__);                                  \
2722         __ext4_error_file(file, "", 0, block, " ");                     \
2723 } while (0)
2724 #define ext4_error(sb, fmt, ...)                                        \
2725 do {                                                                    \
2726         no_printk(fmt, ##__VA_ARGS__);                                  \
2727         __ext4_error(sb, "", 0, " ");                                   \
2728 } while (0)
2729 #define ext4_abort(sb, fmt, ...)                                        \
2730 do {                                                                    \
2731         no_printk(fmt, ##__VA_ARGS__);                                  \
2732         __ext4_abort(sb, "", 0, " ");                                   \
2733 } while (0)
2734 #define ext4_warning(sb, fmt, ...)                                      \
2735 do {                                                                    \
2736         no_printk(fmt, ##__VA_ARGS__);                                  \
2737         __ext4_warning(sb, "", 0, " ");                                 \
2738 } while (0)
2739 #define ext4_warning_inode(inode, fmt, ...)                             \
2740 do {                                                                    \
2741         no_printk(fmt, ##__VA_ARGS__);                                  \
2742         __ext4_warning_inode(inode, "", 0, " ");                        \
2743 } while (0)
2744 #define ext4_msg(sb, level, fmt, ...)                                   \
2745 do {                                                                    \
2746         no_printk(fmt, ##__VA_ARGS__);                                  \
2747         __ext4_msg(sb, "", " ");                                        \
2748 } while (0)
2749 #define dump_mmp_msg(sb, mmp, msg)                                      \
2750         __dump_mmp_msg(sb, mmp, "", 0, "")
2751 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2752 do {                                                                    \
2753         no_printk(fmt, ##__VA_ARGS__);                          \
2754         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2755 } while (0)
2756
2757 #endif
2758
2759 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2760                                         __u32 compat);
2761 extern int ext4_update_rocompat_feature(handle_t *handle,
2762                                         struct super_block *sb, __u32 rocompat);
2763 extern int ext4_update_incompat_feature(handle_t *handle,
2764                                         struct super_block *sb, __u32 incompat);
2765 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2766                                       struct ext4_group_desc *bg);
2767 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2768                                       struct ext4_group_desc *bg);
2769 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2770                                      struct ext4_group_desc *bg);
2771 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2772                                       struct ext4_group_desc *bg);
2773 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2774                                  struct ext4_group_desc *bg);
2775 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2776                                 struct ext4_group_desc *bg);
2777 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2778                                    struct ext4_group_desc *bg);
2779 extern void ext4_block_bitmap_set(struct super_block *sb,
2780                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2781 extern void ext4_inode_bitmap_set(struct super_block *sb,
2782                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2783 extern void ext4_inode_table_set(struct super_block *sb,
2784                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2785 extern void ext4_free_group_clusters_set(struct super_block *sb,
2786                                          struct ext4_group_desc *bg,
2787                                          __u32 count);
2788 extern void ext4_free_inodes_set(struct super_block *sb,
2789                                 struct ext4_group_desc *bg, __u32 count);
2790 extern void ext4_used_dirs_set(struct super_block *sb,
2791                                 struct ext4_group_desc *bg, __u32 count);
2792 extern void ext4_itable_unused_set(struct super_block *sb,
2793                                    struct ext4_group_desc *bg, __u32 count);
2794 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2795                                        struct ext4_group_desc *gdp);
2796 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2797                                      struct ext4_group_desc *gdp);
2798 extern int ext4_register_li_request(struct super_block *sb,
2799                                     ext4_group_t first_not_zeroed);
2800
2801 static inline int ext4_has_metadata_csum(struct super_block *sb)
2802 {
2803         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2804                      !EXT4_SB(sb)->s_chksum_driver);
2805
2806         return ext4_has_feature_metadata_csum(sb) &&
2807                (EXT4_SB(sb)->s_chksum_driver != NULL);
2808 }
2809
2810 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2811 {
2812         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2813 }
2814
2815 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2816 {
2817         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2818                 le32_to_cpu(es->s_blocks_count_lo);
2819 }
2820
2821 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2822 {
2823         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2824                 le32_to_cpu(es->s_r_blocks_count_lo);
2825 }
2826
2827 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2828 {
2829         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2830                 le32_to_cpu(es->s_free_blocks_count_lo);
2831 }
2832
2833 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2834                                          ext4_fsblk_t blk)
2835 {
2836         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2837         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2838 }
2839
2840 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2841                                               ext4_fsblk_t blk)
2842 {
2843         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2844         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2845 }
2846
2847 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2848                                            ext4_fsblk_t blk)
2849 {
2850         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2851         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2852 }
2853
2854 static inline loff_t ext4_isize(struct super_block *sb,
2855                                 struct ext4_inode *raw_inode)
2856 {
2857         if (ext4_has_feature_largedir(sb) ||
2858             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2859                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2860                         le32_to_cpu(raw_inode->i_size_lo);
2861
2862         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2863 }
2864
2865 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2866 {
2867         raw_inode->i_size_lo = cpu_to_le32(i_size);
2868         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2869 }
2870
2871 static inline
2872 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2873                                             ext4_group_t group)
2874 {
2875          struct ext4_group_info ***grp_info;
2876          long indexv, indexh;
2877          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2878          grp_info = EXT4_SB(sb)->s_group_info;
2879          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2880          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2881          return grp_info[indexv][indexh];
2882 }
2883
2884 /*
2885  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2886  * the locking protocol documented in the comments of ext4_group_add()
2887  * in resize.c
2888  */
2889 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2890 {
2891         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2892
2893         smp_rmb();
2894         return ngroups;
2895 }
2896
2897 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2898                                              ext4_group_t block_group)
2899 {
2900         return block_group >> sbi->s_log_groups_per_flex;
2901 }
2902
2903 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2904 {
2905         return 1 << sbi->s_log_groups_per_flex;
2906 }
2907
2908 #define ext4_std_error(sb, errno)                               \
2909 do {                                                            \
2910         if ((errno))                                            \
2911                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2912 } while (0)
2913
2914 #ifdef CONFIG_SMP
2915 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2916  * counters. So we need to make sure we have free clusters more
2917  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2918  */
2919 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2920 #else
2921 #define EXT4_FREECLUSTERS_WATERMARK 0
2922 #endif
2923
2924 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2925 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2926 {
2927         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2928                      !inode_is_locked(inode));
2929         down_write(&EXT4_I(inode)->i_data_sem);
2930         if (newsize > EXT4_I(inode)->i_disksize)
2931                 EXT4_I(inode)->i_disksize = newsize;
2932         up_write(&EXT4_I(inode)->i_data_sem);
2933 }
2934
2935 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2936 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2937 {
2938         int changed = 0;
2939
2940         if (newsize > inode->i_size) {
2941                 i_size_write(inode, newsize);
2942                 changed = 1;
2943         }
2944         if (newsize > EXT4_I(inode)->i_disksize) {
2945                 ext4_update_i_disksize(inode, newsize);
2946                 changed |= 2;
2947         }
2948         return changed;
2949 }
2950
2951 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2952                                       loff_t len);
2953
2954 struct ext4_group_info {
2955         unsigned long   bb_state;
2956         struct rb_root  bb_free_root;
2957         ext4_grpblk_t   bb_first_free;  /* first free block */
2958         ext4_grpblk_t   bb_free;        /* total free blocks */
2959         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2960         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2961         struct          list_head bb_prealloc_list;
2962 #ifdef DOUBLE_CHECK
2963         void            *bb_bitmap;
2964 #endif
2965         struct rw_semaphore alloc_sem;
2966         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2967                                          * regions, index is order.
2968                                          * bb_counters[3] = 5 means
2969                                          * 5 free 8-block regions. */
2970 };
2971
2972 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2973 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2974 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2975 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2976 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
2977         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2978 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
2979         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
2980
2981 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2982         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2983 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2984         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2985 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2986         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2987
2988 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2989         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2990 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2991         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2992 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2993         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2994
2995 #define EXT4_MAX_CONTENTION             8
2996 #define EXT4_CONTENTION_THRESHOLD       2
2997
2998 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2999                                               ext4_group_t group)
3000 {
3001         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3002 }
3003
3004 /*
3005  * Returns true if the filesystem is busy enough that attempts to
3006  * access the block group locks has run into contention.
3007  */
3008 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3009 {
3010         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3011 }
3012
3013 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3014 {
3015         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3016         if (spin_trylock(lock))
3017                 /*
3018                  * We're able to grab the lock right away, so drop the
3019                  * lock contention counter.
3020                  */
3021                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3022         else {
3023                 /*
3024                  * The lock is busy, so bump the contention counter,
3025                  * and then wait on the spin lock.
3026                  */
3027                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3028                                   EXT4_MAX_CONTENTION);
3029                 spin_lock(lock);
3030         }
3031 }
3032
3033 static inline void ext4_unlock_group(struct super_block *sb,
3034                                         ext4_group_t group)
3035 {
3036         spin_unlock(ext4_group_lock_ptr(sb, group));
3037 }
3038
3039 /*
3040  * Block validity checking
3041  */
3042 #define ext4_check_indirect_blockref(inode, bh)                         \
3043         ext4_check_blockref(__func__, __LINE__, inode,                  \
3044                             (__le32 *)(bh)->b_data,                     \
3045                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3046
3047 #define ext4_ind_check_inode(inode)                                     \
3048         ext4_check_blockref(__func__, __LINE__, inode,                  \
3049                             EXT4_I(inode)->i_data,                      \
3050                             EXT4_NDIR_BLOCKS)
3051
3052 /*
3053  * Inodes and files operations
3054  */
3055
3056 /* dir.c */
3057 extern const struct file_operations ext4_dir_operations;
3058
3059 #ifdef CONFIG_UNICODE
3060 extern const struct dentry_operations ext4_dentry_ops;
3061 #endif
3062
3063 /* file.c */
3064 extern const struct inode_operations ext4_file_inode_operations;
3065 extern const struct file_operations ext4_file_operations;
3066 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3067
3068 /* inline.c */
3069 extern int ext4_get_max_inline_size(struct inode *inode);
3070 extern int ext4_find_inline_data_nolock(struct inode *inode);
3071 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3072                                  unsigned int len);
3073 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3074
3075 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3076 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3077                                          struct inode *inode,
3078                                          loff_t pos, unsigned len,
3079                                          unsigned flags,
3080                                          struct page **pagep);
3081 extern int ext4_write_inline_data_end(struct inode *inode,
3082                                       loff_t pos, unsigned len,
3083                                       unsigned copied,
3084                                       struct page *page);
3085 extern struct buffer_head *
3086 ext4_journalled_write_inline_data(struct inode *inode,
3087                                   unsigned len,
3088                                   struct page *page);
3089 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3090                                            struct inode *inode,
3091                                            loff_t pos, unsigned len,
3092                                            unsigned flags,
3093                                            struct page **pagep,
3094                                            void **fsdata);
3095 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3096                                          unsigned len, unsigned copied,
3097                                          struct page *page);
3098 extern int ext4_try_add_inline_entry(handle_t *handle,
3099                                      struct ext4_filename *fname,
3100                                      struct inode *dir, struct inode *inode);
3101 extern int ext4_try_create_inline_dir(handle_t *handle,
3102                                       struct inode *parent,
3103                                       struct inode *inode);
3104 extern int ext4_read_inline_dir(struct file *filp,
3105                                 struct dir_context *ctx,
3106                                 int *has_inline_data);
3107 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3108                                   struct inode *dir, ext4_lblk_t block,
3109                                   struct dx_hash_info *hinfo,
3110                                   __u32 start_hash, __u32 start_minor_hash,
3111                                   int *has_inline_data);
3112 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3113                                         struct ext4_filename *fname,
3114                                         struct ext4_dir_entry_2 **res_dir,
3115                                         int *has_inline_data);
3116 extern int ext4_delete_inline_entry(handle_t *handle,
3117                                     struct inode *dir,
3118                                     struct ext4_dir_entry_2 *de_del,
3119                                     struct buffer_head *bh,
3120                                     int *has_inline_data);
3121 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3122 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3123                                         struct ext4_dir_entry_2 **parent_de,
3124                                         int *retval);
3125 extern int ext4_inline_data_fiemap(struct inode *inode,
3126                                    struct fiemap_extent_info *fieinfo,
3127                                    int *has_inline, __u64 start, __u64 len);
3128
3129 struct iomap;
3130 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3131
3132 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3133
3134 extern int ext4_convert_inline_data(struct inode *inode);
3135
3136 static inline int ext4_has_inline_data(struct inode *inode)
3137 {
3138         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3139                EXT4_I(inode)->i_inline_off;
3140 }
3141
3142 /* namei.c */
3143 extern const struct inode_operations ext4_dir_inode_operations;
3144 extern const struct inode_operations ext4_special_inode_operations;
3145 extern struct dentry *ext4_get_parent(struct dentry *child);
3146 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3147                                  struct ext4_dir_entry_2 *de,
3148                                  int blocksize, int csum_size,
3149                                  unsigned int parent_ino, int dotdot_real_len);
3150 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3151                                         unsigned int blocksize);
3152 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3153                                       struct buffer_head *bh);
3154 extern int ext4_ci_compare(const struct inode *parent,
3155                            const struct qstr *fname,
3156                            const struct qstr *entry, bool quick);
3157
3158 #define S_SHIFT 12
3159 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3160         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3161         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3162         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3163         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3164         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3165         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3166         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3167 };
3168
3169 static inline void ext4_set_de_type(struct super_block *sb,
3170                                 struct ext4_dir_entry_2 *de,
3171                                 umode_t mode) {
3172         if (ext4_has_feature_filetype(sb))
3173                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3174 }
3175
3176 /* readpages.c */
3177 extern int ext4_mpage_readpages(struct address_space *mapping,
3178                                 struct list_head *pages, struct page *page,
3179                                 unsigned nr_pages, bool is_readahead);
3180
3181 /* symlink.c */
3182 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3183 extern const struct inode_operations ext4_symlink_inode_operations;
3184 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3185
3186 /* sysfs.c */
3187 extern int ext4_register_sysfs(struct super_block *sb);
3188 extern void ext4_unregister_sysfs(struct super_block *sb);
3189 extern int __init ext4_init_sysfs(void);
3190 extern void ext4_exit_sysfs(void);
3191
3192 /* block_validity */
3193 extern void ext4_release_system_zone(struct super_block *sb);
3194 extern int ext4_setup_system_zone(struct super_block *sb);
3195 extern int __init ext4_init_system_zone(void);
3196 extern void ext4_exit_system_zone(void);
3197 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3198                                  ext4_fsblk_t start_blk,
3199                                  unsigned int count);
3200 extern int ext4_check_blockref(const char *, unsigned int,
3201                                struct inode *, __le32 *, unsigned int);
3202
3203 /* extents.c */
3204 struct ext4_ext_path;
3205 struct ext4_extent;
3206
3207 /*
3208  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3209  * __le32.
3210  */
3211 #define EXT_MAX_BLOCKS  0xffffffff
3212
3213 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3214 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3215 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3216 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3217                                struct ext4_map_blocks *map, int flags);
3218 extern int ext4_ext_truncate(handle_t *, struct inode *);
3219 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3220                                  ext4_lblk_t end);
3221 extern void ext4_ext_init(struct super_block *);
3222 extern void ext4_ext_release(struct super_block *);
3223 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3224                           loff_t len);
3225 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3226                                           loff_t offset, ssize_t len);
3227 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3228                            struct ext4_map_blocks *map, int flags);
3229 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3230                                          ext4_lblk_t lblocks);
3231 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3232                                                    int num,
3233                                                    struct ext4_ext_path *path);
3234 extern int ext4_can_extents_be_merged(struct inode *inode,
3235                                       struct ext4_extent *ex1,
3236                                       struct ext4_extent *ex2);
3237 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3238                                   struct ext4_ext_path **,
3239                                   struct ext4_extent *, int);
3240 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3241                                               struct ext4_ext_path **,
3242                                               int flags);
3243 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3244 extern int ext4_ext_check_inode(struct inode *inode);
3245 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3246 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3247                         __u64 start, __u64 len);
3248 extern int ext4_ext_precache(struct inode *inode);
3249 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3250 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3251 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3252                                 struct inode *inode2, ext4_lblk_t lblk1,
3253                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3254                              int mark_unwritten,int *err);
3255 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3256
3257 /* move_extent.c */
3258 extern void ext4_double_down_write_data_sem(struct inode *first,
3259                                             struct inode *second);
3260 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3261                                           struct inode *donor_inode);
3262 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3263                              __u64 start_orig, __u64 start_donor,
3264                              __u64 len, __u64 *moved_len);
3265
3266 /* page-io.c */
3267 extern int __init ext4_init_pageio(void);
3268 extern void ext4_exit_pageio(void);
3269 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3270 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3271 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3272 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3273 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3274                                 struct writeback_control *wbc);
3275 extern void ext4_end_io_rsv_work(struct work_struct *work);
3276 extern void ext4_io_submit(struct ext4_io_submit *io);
3277 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3278                                struct page *page,
3279                                int len,
3280                                struct writeback_control *wbc,
3281                                bool keep_towrite);
3282
3283 /* mmp.c */
3284 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3285
3286 /*
3287  * Add new method to test whether block and inode bitmaps are properly
3288  * initialized. With uninit_bg reading the block from disk is not enough
3289  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3290  */
3291 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3292
3293 static inline int bitmap_uptodate(struct buffer_head *bh)
3294 {
3295         return (buffer_uptodate(bh) &&
3296                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3297 }
3298 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3299 {
3300         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3301 }
3302
3303 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3304
3305 /* For ioend & aio unwritten conversion wait queues */
3306 #define EXT4_WQ_HASH_SZ         37
3307 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3308                                             EXT4_WQ_HASH_SZ])
3309 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3310
3311 extern int ext4_resize_begin(struct super_block *sb);
3312 extern void ext4_resize_end(struct super_block *sb);
3313
3314 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3315                                               struct ext4_io_end *io_end)
3316 {
3317         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3318                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3319                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3320         }
3321 }
3322
3323 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3324 {
3325         struct inode *inode = io_end->inode;
3326
3327         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3328                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3329                 /* Wake up anyone waiting on unwritten extent conversion */
3330                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3331                         wake_up_all(ext4_ioend_wq(inode));
3332         }
3333 }
3334
3335 extern const struct iomap_ops ext4_iomap_ops;
3336
3337 #endif  /* __KERNEL__ */
3338
3339 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3340 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3341
3342 #endif  /* _EXT4_H */