fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/version.h>
  31 #include <linux/wait.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/blockgroup_lock.h>
  34 #include <linux/percpu_counter.h>
  35 #include <linux/ratelimit.h>
  36 #include <crypto/hash.h>
  37 #include <linux/falloc.h>
  38 #include <linux/percpu-rwsem.h>
  39 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #include <linux/fscrypt.h>
  44 #include <linux/fsverity.h>
  45
  46 #include <linux/compiler.h>
  47
  48 /*
  49  * The fourth extended filesystem constants/structures
  50  */
  51
  52 /*
  53  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  54  * structures. these checks slow things down a lot
  55  */
  56 #define AGGRESSIVE_CHECK__
  57
  58 /*
  59  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  60  * bitmaps, maintains and uses them to check for double allocations
  61  */
  62 #define DOUBLE_CHECK__
  63
  64 /*
  65  * Define EXT4FS_DEBUG to produce debug messages
  66  */
  67 #undef EXT4FS_DEBUG
  68
  69 /*
  70  * Debug code
  71  */
  72 #ifdef EXT4FS_DEBUG
  73 #define ext4_debug(f, a...)                                             \
  74         do {                                                            \
  75                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  76                         __FILE__, __LINE__, __func__);                  \
  77                 printk(KERN_DEBUG f, ## a);                             \
  78         } while (0)
  79 #else
  80 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  81 #endif
  82
  83 /*
  84  * Turn on EXT_DEBUG to get lots of info about extents operations.
  85  */
  86 #define EXT_DEBUG__
  87 #ifdef EXT_DEBUG
  88 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  89 #else
  90 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  91 #endif
  92
  93 /* data type for block offset of block group */
  94 typedef int ext4_grpblk_t;
  95
  96 /* data type for filesystem-wide blocks number */
  97 typedef unsigned long long ext4_fsblk_t;
  98
  99 /* data type for file logical block number */
 100 typedef __u32 ext4_lblk_t;
 101
 102 /* data type for block group number */
 103 typedef unsigned int ext4_group_t;
 104
 105 enum SHIFT_DIRECTION {
 106         SHIFT_LEFT = 0,
 107         SHIFT_RIGHT,
 108 };
 109
 110 /*
 111  * Flags used in mballoc's allocation_context flags field.
 112  *
 113  * Also used to show what's going on for debugging purposes when the
 114  * flag field is exported via the traceport interface
 115  */
 116
 117 /* prefer goal again. length */
 118 #define EXT4_MB_HINT_MERGE              0x0001
 119 /* blocks already reserved */
 120 #define EXT4_MB_HINT_RESERVED           0x0002
 121 /* metadata is being allocated */
 122 #define EXT4_MB_HINT_METADATA           0x0004
 123 /* first blocks in the file */
 124 #define EXT4_MB_HINT_FIRST              0x0008
 125 /* search for the best chunk */
 126 #define EXT4_MB_HINT_BEST               0x0010
 127 /* data is being allocated */
 128 #define EXT4_MB_HINT_DATA               0x0020
 129 /* don't preallocate (for tails) */
 130 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 131 /* allocate for locality group */
 132 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 133 /* allocate goal blocks or none */
 134 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 135 /* goal is meaningful */
 136 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 137 /* blocks already pre-reserved by delayed allocation */
 138 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 139 /* We are doing stream allocation */
 140 #define EXT4_MB_STREAM_ALLOC            0x0800
 141 /* Use reserved root blocks if needed */
 142 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 143 /* Use blocks from reserved pool */
 144 #define EXT4_MB_USE_RESERVED            0x2000
 145
 146 struct ext4_allocation_request {
 147         /* target inode for block we're allocating */
 148         struct inode *inode;
 149         /* how many blocks we want to allocate */
 150         unsigned int len;
 151         /* logical block in target inode */
 152         ext4_lblk_t logical;
 153         /* the closest logical allocated block to the left */
 154         ext4_lblk_t lleft;
 155         /* the closest logical allocated block to the right */
 156         ext4_lblk_t lright;
 157         /* phys. target (a hint) */
 158         ext4_fsblk_t goal;
 159         /* phys. block for the closest logical allocated block to the left */
 160         ext4_fsblk_t pleft;
 161         /* phys. block for the closest logical allocated block to the right */
 162         ext4_fsblk_t pright;
 163         /* flags. see above EXT4_MB_HINT_* */
 164         unsigned int flags;
 165 };
 166
 167 /*
 168  * Logical to physical block mapping, used by ext4_map_blocks()
 169  *
 170  * This structure is used to pass requests into ext4_map_blocks() as
 171  * well as to store the information returned by ext4_map_blocks().  It
 172  * takes less room on the stack than a struct buffer_head.
 173  */
 174 #define EXT4_MAP_NEW            (1 << BH_New)
 175 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 176 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 177 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 178 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 179                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 180
 181 struct ext4_map_blocks {
 182         ext4_fsblk_t m_pblk;
 183         ext4_lblk_t m_lblk;
 184         unsigned int m_len;
 185         unsigned int m_flags;
 186 };
 187
 188 /*
 189  * Flags for ext4_io_end->flags
 190  */
 191 #define EXT4_IO_END_UNWRITTEN   0x0001
 192
 193 /*
 194  * For converting unwritten extents on a work queue. 'handle' is used for
 195  * buffered writeback.
 196  */
 197 typedef struct ext4_io_end {
 198         struct list_head        list;           /* per-file finished IO list */
 199         handle_t                *handle;        /* handle reserved for extent
 200                                                  * conversion */
 201         struct inode            *inode;         /* file being written to */
 202         struct bio              *bio;           /* Linked list of completed
 203                                                  * bios covering the extent */
 204         unsigned int            flag;           /* unwritten or not */
 205         atomic_t                count;          /* reference counter */
 206         loff_t                  offset;         /* offset in the file */
 207         ssize_t                 size;           /* size of the extent */
 208 } ext4_io_end_t;
 209
 210 struct ext4_io_submit {
 211         struct writeback_control *io_wbc;
 212         struct bio              *io_bio;
 213         ext4_io_end_t           *io_end;
 214         sector_t                io_next_block;
 215 };
 216
 217 /*
 218  * Special inodes numbers
 219  */
 220 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 221 #define EXT4_ROOT_INO            2      /* Root inode */
 222 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 223 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 224 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 225 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 226 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 227 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 228
 229 /* First non-reserved inode for old ext4 filesystems */
 230 #define EXT4_GOOD_OLD_FIRST_INO 11
 231
 232 /*
 233  * Maximal count of links to a file
 234  */
 235 #define EXT4_LINK_MAX           65000
 236
 237 /*
 238  * Macro-instructions used to manage several block sizes
 239  */
 240 #define EXT4_MIN_BLOCK_SIZE             1024
 241 #define EXT4_MAX_BLOCK_SIZE             65536
 242 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 243 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 244 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 245 #ifdef __KERNEL__
 246 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 247 #else
 248 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 249 #endif
 250 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 251 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 252                                          EXT4_SB(s)->s_cluster_bits)
 253 #ifdef __KERNEL__
 254 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 255 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 256 #else
 257 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 258 #endif
 259 #ifdef __KERNEL__
 260 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 261 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 262 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 263 #else
 264 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 265                                  EXT4_GOOD_OLD_INODE_SIZE : \
 266                                  (s)->s_inode_size)
 267 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 268                                  EXT4_GOOD_OLD_FIRST_INO : \
 269                                  (s)->s_first_ino)
 270 #endif
 271 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 272 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 273         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 274                                                                   blkbits))
 275
 276 /* Translate a block number to a cluster number */
 277 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 278 /* Translate a cluster number to a block number */
 279 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 280 /* Translate # of blks to # of clusters */
 281 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 282                                  (sbi)->s_cluster_bits)
 283 /* Mask out the low bits to get the starting block of the cluster */
 284 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 285                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 286 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 287                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 288 /* Get the cluster offset */
 289 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 290                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 291 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 292                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 293
 294 /*
 295  * Structure of a blocks group descriptor
 296  */
 297 struct ext4_group_desc
 298 {
 299         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 300         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 301         __le32  bg_inode_table_lo;      /* Inodes table block */
 302         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 303         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 304         __le16  bg_used_dirs_count_lo;  /* Directories count */
 305         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 306         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 307         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 308         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 309         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 310         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 311         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 312         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 313         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 314         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 315         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 316         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 317         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 318         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 319         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 320         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 321         __u32   bg_reserved;
 322 };
 323
 324 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 325         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 326          sizeof(__le16))
 327 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 328         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 329          sizeof(__le16))
 330
 331 /*
 332  * Structure of a flex block group info
 333  */
 334
 335 struct flex_groups {
 336         atomic64_t      free_clusters;
 337         atomic_t        free_inodes;
 338         atomic_t        used_dirs;
 339 };
 340
 341 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 342 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 343 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 344
 345 /*
 346  * Macro-instructions used to manage group descriptors
 347  */
 348 #define EXT4_MIN_DESC_SIZE              32
 349 #define EXT4_MIN_DESC_SIZE_64BIT        64
 350 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 351 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 352 #ifdef __KERNEL__
 353 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 354 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 355 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 356 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 357 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 358 #else
 359 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 360 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 361 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 362 #endif
 363
 364 /*
 365  * Constants relative to the data blocks
 366  */
 367 #define EXT4_NDIR_BLOCKS                12
 368 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 369 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 370 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 371 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 372
 373 /*
 374  * Inode flags
 375  */
 376 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 377 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 378 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 379 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 380 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 381 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 382 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 383 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 384 /* Reserved for compression usage... */
 385 #define EXT4_DIRTY_FL                   0x00000100
 386 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 387 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 388         /* nb: was previously EXT2_ECOMPR_FL */
 389 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 390 /* End compression flags --- maybe not all used */
 391 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 392 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 393 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 394 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 395 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 396 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 397 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 398 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 399 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 400 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 401 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 402 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 403 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 404 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded file */
 405 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 406
 407 #define EXT4_FL_USER_VISIBLE            0x705BDFFF /* User visible flags */
 408 #define EXT4_FL_USER_MODIFIABLE         0x604BC0FF /* User modifiable flags */
 409
 410 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 411 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 412                                          EXT4_IMMUTABLE_FL | \
 413                                          EXT4_APPEND_FL | \
 414                                          EXT4_NODUMP_FL | \
 415                                          EXT4_NOATIME_FL | \
 416                                          EXT4_PROJINHERIT_FL)
 417
 418 /* Flags that should be inherited by new inodes from their parent. */
 419 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 420                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 421                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 422                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 423                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
 424
 425 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 426 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 427                            EXT4_PROJINHERIT_FL))
 428
 429 /* Flags that are appropriate for non-directories/regular files. */
 430 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 431
 432 /* The only flags that should be swapped */
 433 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 434
 435 /* Mask out flags that are inappropriate for the given type of inode. */
 436 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 437 {
 438         if (S_ISDIR(mode))
 439                 return flags;
 440         else if (S_ISREG(mode))
 441                 return flags & EXT4_REG_FLMASK;
 442         else
 443                 return flags & EXT4_OTHER_FLMASK;
 444 }
 445
 446 /*
 447  * Inode flags used for atomic set/get
 448  */
 449 enum {
 450         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 451         EXT4_INODE_UNRM         = 1,    /* Undelete */
 452         EXT4_INODE_COMPR        = 2,    /* Compress file */
 453         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 454         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 455         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 456         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 457         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 458 /* Reserved for compression usage... */
 459         EXT4_INODE_DIRTY        = 8,
 460         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 461         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 462         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 463 /* End compression flags --- maybe not all used */
 464         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 465         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 466         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 467         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 468         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 469         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 470         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 471         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 472         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 473         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 474         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 475         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 476         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 477         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 478 };
 479
 480 /*
 481  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 482  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 483  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 484  * any extra space in the compiled kernel image, otherwise, the build will fail.
 485  * It's important that these values are the same, since we are using
 486  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 487  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 488  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 489  * defined in e2fsprogs.
 490  *
 491  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 492  */
 493 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 494 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 495
 496 static inline void ext4_check_flag_values(void)
 497 {
 498         CHECK_FLAG_VALUE(SECRM);
 499         CHECK_FLAG_VALUE(UNRM);
 500         CHECK_FLAG_VALUE(COMPR);
 501         CHECK_FLAG_VALUE(SYNC);
 502         CHECK_FLAG_VALUE(IMMUTABLE);
 503         CHECK_FLAG_VALUE(APPEND);
 504         CHECK_FLAG_VALUE(NODUMP);
 505         CHECK_FLAG_VALUE(NOATIME);
 506         CHECK_FLAG_VALUE(DIRTY);
 507         CHECK_FLAG_VALUE(COMPRBLK);
 508         CHECK_FLAG_VALUE(NOCOMPR);
 509         CHECK_FLAG_VALUE(ENCRYPT);
 510         CHECK_FLAG_VALUE(INDEX);
 511         CHECK_FLAG_VALUE(IMAGIC);
 512         CHECK_FLAG_VALUE(JOURNAL_DATA);
 513         CHECK_FLAG_VALUE(NOTAIL);
 514         CHECK_FLAG_VALUE(DIRSYNC);
 515         CHECK_FLAG_VALUE(TOPDIR);
 516         CHECK_FLAG_VALUE(HUGE_FILE);
 517         CHECK_FLAG_VALUE(EXTENTS);
 518         CHECK_FLAG_VALUE(VERITY);
 519         CHECK_FLAG_VALUE(EA_INODE);
 520         CHECK_FLAG_VALUE(EOFBLOCKS);
 521         CHECK_FLAG_VALUE(INLINE_DATA);
 522         CHECK_FLAG_VALUE(PROJINHERIT);
 523         CHECK_FLAG_VALUE(RESERVED);
 524 }
 525
 526 /* Used to pass group descriptor data when online resize is done */
 527 struct ext4_new_group_input {
 528         __u32 group;            /* Group number for this data */
 529         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 530         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 531         __u64 inode_table;      /* Absolute block number of inode table start */
 532         __u32 blocks_count;     /* Total number of blocks in this group */
 533         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 534         __u16 unused;
 535 };
 536
 537 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 538 struct compat_ext4_new_group_input {
 539         u32 group;
 540         compat_u64 block_bitmap;
 541         compat_u64 inode_bitmap;
 542         compat_u64 inode_table;
 543         u32 blocks_count;
 544         u16 reserved_blocks;
 545         u16 unused;
 546 };
 547 #endif
 548
 549 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 550 struct ext4_new_group_data {
 551         __u32 group;
 552         __u64 block_bitmap;
 553         __u64 inode_bitmap;
 554         __u64 inode_table;
 555         __u32 blocks_count;
 556         __u16 reserved_blocks;
 557         __u16 mdata_blocks;
 558         __u32 free_clusters_count;
 559 };
 560
 561 /* Indexes used to index group tables in ext4_new_group_data */
 562 enum {
 563         BLOCK_BITMAP = 0,       /* block bitmap */
 564         INODE_BITMAP,           /* inode bitmap */
 565         INODE_TABLE,            /* inode tables */
 566         GROUP_TABLE_COUNT,
 567 };
 568
 569 /*
 570  * Flags used by ext4_map_blocks()
 571  */
 572         /* Allocate any needed blocks and/or convert an unwritten
 573            extent to be an initialized ext4 */
 574 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 575         /* Request the creation of an unwritten extent */
 576 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 577 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 578                                                  EXT4_GET_BLOCKS_CREATE)
 579         /* Caller is from the delayed allocation writeout path
 580          * finally doing the actual allocation of delayed blocks */
 581 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 582         /* caller is from the direct IO path, request to creation of an
 583         unwritten extents if not allocated, split the unwritten
 584         extent if blocks has been preallocated already*/
 585 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 586 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 587 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 588                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 589         /* Convert extent to initialized after IO complete */
 590 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 591                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 592         /* Eventual metadata allocation (due to growing extent tree)
 593          * should not fail, so try to use reserved blocks for that.*/
 594 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 595         /* Don't normalize allocation size (used for fallocate) */
 596 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 597         /* Request will not result in inode size update (user for fallocate) */
 598 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 599         /* Convert written extents to unwritten */
 600 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 601         /* Write zeros to newly created written extents */
 602 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 603 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 604                                         EXT4_GET_BLOCKS_ZERO)
 605         /* Caller will submit data before dropping transaction handle. This
 606          * allows jbd2 to avoid submitting data before commit. */
 607 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 608
 609 /*
 610  * The bit position of these flags must not overlap with any of the
 611  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 612  * read_extent_tree_block(), ext4_split_extent_at(),
 613  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 614  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 615  * caching the extents when reading from the extent tree while a
 616  * truncate or punch hole operation is in progress.
 617  */
 618 #define EXT4_EX_NOCACHE                         0x40000000
 619 #define EXT4_EX_FORCE_CACHE                     0x20000000
 620
 621 /*
 622  * Flags used by ext4_free_blocks
 623  */
 624 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 625 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 626 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 627 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 628 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 629 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 630 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 631
 632 /*
 633  * ioctl commands
 634  */
 635 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 636 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 637 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 638 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 639 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 640 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 641 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 642 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 643 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 644 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 645 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 646  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 647  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 648 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 649 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 650 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 651 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 652 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 653 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 654 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 655 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 656
 657 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 658 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 659
 660 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 661
 662 /*
 663  * Flags for going down operation
 664  */
 665 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 666 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 667 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 668
 669
 670 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 671 /*
 672  * ioctl commands in 32 bit emulation
 673  */
 674 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 675 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 676 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 677 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 678 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 679 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 680 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 681 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 682 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 683 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 684 #endif
 685
 686 /* Max physical block we can address w/o extents */
 687 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 688
 689 /* Max logical block we can support */
 690 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 691
 692 /*
 693  * Structure of an inode on the disk
 694  */
 695 struct ext4_inode {
 696         __le16  i_mode;         /* File mode */
 697         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 698         __le32  i_size_lo;      /* Size in bytes */
 699         __le32  i_atime;        /* Access time */
 700         __le32  i_ctime;        /* Inode Change time */
 701         __le32  i_mtime;        /* Modification time */
 702         __le32  i_dtime;        /* Deletion Time */
 703         __le16  i_gid;          /* Low 16 bits of Group Id */
 704         __le16  i_links_count;  /* Links count */
 705         __le32  i_blocks_lo;    /* Blocks count */
 706         __le32  i_flags;        /* File flags */
 707         union {
 708                 struct {
 709                         __le32  l_i_version;
 710                 } linux1;
 711                 struct {
 712                         __u32  h_i_translator;
 713                 } hurd1;
 714                 struct {
 715                         __u32  m_i_reserved1;
 716                 } masix1;
 717         } osd1;                         /* OS dependent 1 */
 718         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 719         __le32  i_generation;   /* File version (for NFS) */
 720         __le32  i_file_acl_lo;  /* File ACL */
 721         __le32  i_size_high;
 722         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 723         union {
 724                 struct {
 725                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 726                         __le16  l_i_file_acl_high;
 727                         __le16  l_i_uid_high;   /* these 2 fields */
 728                         __le16  l_i_gid_high;   /* were reserved2[0] */
 729                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 730                         __le16  l_i_reserved;
 731                 } linux2;
 732                 struct {
 733                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 734                         __u16   h_i_mode_high;
 735                         __u16   h_i_uid_high;
 736                         __u16   h_i_gid_high;
 737                         __u32   h_i_author;
 738                 } hurd2;
 739                 struct {
 740                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 741                         __le16  m_i_file_acl_high;
 742                         __u32   m_i_reserved2[2];
 743                 } masix2;
 744         } osd2;                         /* OS dependent 2 */
 745         __le16  i_extra_isize;
 746         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 747         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 748         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 749         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 750         __le32  i_crtime;       /* File Creation time */
 751         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 752         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 753         __le32  i_projid;       /* Project ID */
 754 };
 755
 756 struct move_extent {
 757         __u32 reserved;         /* should be zero */
 758         __u32 donor_fd;         /* donor file descriptor */
 759         __u64 orig_start;       /* logical start offset in block for orig */
 760         __u64 donor_start;      /* logical start offset in block for donor */
 761         __u64 len;              /* block length to be moved */
 762         __u64 moved_len;        /* moved block length */
 763 };
 764
 765 #define EXT4_EPOCH_BITS 2
 766 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 767 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 768
 769 /*
 770  * Extended fields will fit into an inode if the filesystem was formatted
 771  * with large inodes (-I 256 or larger) and there are not currently any EAs
 772  * consuming all of the available space. For new inodes we always reserve
 773  * enough space for the kernel's known extended fields, but for inodes
 774  * created with an old kernel this might not have been the case. None of
 775  * the extended inode fields is critical for correct filesystem operation.
 776  * This macro checks if a certain field fits in the inode. Note that
 777  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 778  */
 779 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 780         ((offsetof(typeof(*ext4_inode), field) +        \
 781           sizeof((ext4_inode)->field))                  \
 782         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 783             (einode)->i_extra_isize))                   \
 784
 785 /*
 786  * We use an encoding that preserves the times for extra epoch "00":
 787  *
 788  * extra  msb of                         adjust for signed
 789  * epoch  32-bit                         32-bit tv_sec to
 790  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 791  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 792  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 793  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 794  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 795  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 796  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 797  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 798  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 799  *
 800  * Note that previous versions of the kernel on 64-bit systems would
 801  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 802  * 1970.  e2fsck will correct this, assuming that it is run on the
 803  * affected filesystem before 2242.
 804  */
 805
 806 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 807 {
 808         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 809         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 810 }
 811
 812 static inline void ext4_decode_extra_time(struct timespec64 *time,
 813                                           __le32 extra)
 814 {
 815         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
 816
 817 #if 1
 818                 /* Handle legacy encoding of pre-1970 dates with epoch
 819                  * bits 1,1. (This backwards compatibility may be removed
 820                  * at the discretion of the ext4 developers.)
 821                  */
 822                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 823                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 824                         extra_bits = 0;
 825                 time->tv_sec += extra_bits << 32;
 826 #else
 827                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 828 #endif
 829         }
 830         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 831 }
 832
 833 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 834 do {                                                                            \
 835         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 836                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 837                 (raw_inode)->xtime ## _extra =                                  \
 838                                 ext4_encode_extra_time(&(inode)->xtime);        \
 839                 }                                                               \
 840         else    \
 841                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 842 } while (0)
 843
 844 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 845 do {                                                                           \
 846         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 847                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 848         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 849                 (raw_inode)->xtime ## _extra =                                 \
 850                                 ext4_encode_extra_time(&(einode)->xtime);      \
 851 } while (0)
 852
 853 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 854 do {                                                                            \
 855         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 856         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 857                 ext4_decode_extra_time(&(inode)->xtime,                         \
 858                                        raw_inode->xtime ## _extra);             \
 859                 }                                                               \
 860         else                                                                    \
 861                 (inode)->xtime.tv_nsec = 0;                                     \
 862 } while (0)
 863
 864
 865 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 866 do {                                                                           \
 867         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 868                 (einode)->xtime.tv_sec =                                       \
 869                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 870         else                                                                   \
 871                 (einode)->xtime.tv_sec = 0;                                    \
 872         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 873                 ext4_decode_extra_time(&(einode)->xtime,                       \
 874                                        raw_inode->xtime ## _extra);            \
 875         else                                                                   \
 876                 (einode)->xtime.tv_nsec = 0;                                   \
 877 } while (0)
 878
 879 #define i_disk_version osd1.linux1.l_i_version
 880
 881 #if defined(__KERNEL__) || defined(__linux__)
 882 #define i_reserved1     osd1.linux1.l_i_reserved1
 883 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 884 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 885 #define i_uid_low       i_uid
 886 #define i_gid_low       i_gid
 887 #define i_uid_high      osd2.linux2.l_i_uid_high
 888 #define i_gid_high      osd2.linux2.l_i_gid_high
 889 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 890
 891 #elif defined(__GNU__)
 892
 893 #define i_translator    osd1.hurd1.h_i_translator
 894 #define i_uid_high      osd2.hurd2.h_i_uid_high
 895 #define i_gid_high      osd2.hurd2.h_i_gid_high
 896 #define i_author        osd2.hurd2.h_i_author
 897
 898 #elif defined(__masix__)
 899
 900 #define i_reserved1     osd1.masix1.m_i_reserved1
 901 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 902 #define i_reserved2     osd2.masix2.m_i_reserved2
 903
 904 #endif /* defined(__KERNEL__) || defined(__linux__) */
 905
 906 #include "extents_status.h"
 907
 908 /*
 909  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 910  *
 911  * These are needed to avoid lockdep false positives when we need to
 912  * allocate blocks to the quota inode during ext4_map_blocks(), while
 913  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 914  * do quota tracking for the quota inode, this avoids deadlock (as
 915  * well as infinite recursion, since it isn't turtles all the way
 916  * down...)
 917  *
 918  *  I_DATA_SEM_NORMAL - Used for most inodes
 919  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 920  *                        where the second inode has larger inode number
 921  *                        than the first
 922  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 923  */
 924 enum {
 925         I_DATA_SEM_NORMAL = 0,
 926         I_DATA_SEM_OTHER,
 927         I_DATA_SEM_QUOTA,
 928 };
 929
 930
 931 /*
 932  * fourth extended file system inode data in memory
 933  */
 934 struct ext4_inode_info {
 935         __le32  i_data[15];     /* unconverted */
 936         __u32   i_dtime;
 937         ext4_fsblk_t    i_file_acl;
 938
 939         /*
 940          * i_block_group is the number of the block group which contains
 941          * this file's inode.  Constant across the lifetime of the inode,
 942          * it is used for making block allocation decisions - we try to
 943          * place a file's data blocks near its inode block, and new inodes
 944          * near to their parent directory's inode.
 945          */
 946         ext4_group_t    i_block_group;
 947         ext4_lblk_t     i_dir_start_lookup;
 948 #if (BITS_PER_LONG < 64)
 949         unsigned long   i_state_flags;          /* Dynamic state flags */
 950 #endif
 951         unsigned long   i_flags;
 952
 953         /*
 954          * Extended attributes can be read independently of the main file
 955          * data. Taking i_mutex even when reading would cause contention
 956          * between readers of EAs and writers of regular file data, so
 957          * instead we synchronize on xattr_sem when reading or changing
 958          * EAs.
 959          */
 960         struct rw_semaphore xattr_sem;
 961
 962         struct list_head i_orphan;      /* unlinked but open inodes */
 963
 964         /*
 965          * i_disksize keeps track of what the inode size is ON DISK, not
 966          * in memory.  During truncate, i_size is set to the new size by
 967          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 968          * set i_disksize to 0 until the truncate is actually under way.
 969          *
 970          * The intent is that i_disksize always represents the blocks which
 971          * are used by this file.  This allows recovery to restart truncate
 972          * on orphans if we crash during truncate.  We actually write i_disksize
 973          * into the on-disk inode when writing inodes out, instead of i_size.
 974          *
 975          * The only time when i_disksize and i_size may be different is when
 976          * a truncate is in progress.  The only things which change i_disksize
 977          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 978          */
 979         loff_t  i_disksize;
 980
 981         /*
 982          * i_data_sem is for serialising ext4_truncate() against
 983          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 984          * data tree are chopped off during truncate. We can't do that in
 985          * ext4 because whenever we perform intermediate commits during
 986          * truncate, the inode and all the metadata blocks *must* be in a
 987          * consistent state which allows truncation of the orphans to restart
 988          * during recovery.  Hence we must fix the get_block-vs-truncate race
 989          * by other means, so we have i_data_sem.
 990          */
 991         struct rw_semaphore i_data_sem;
 992         /*
 993          * i_mmap_sem is for serializing page faults with truncate / punch hole
 994          * operations. We have to make sure that new page cannot be faulted in
 995          * a section of the inode that is being punched. We cannot easily use
 996          * i_data_sem for this since we need protection for the whole punch
 997          * operation and i_data_sem ranks below transaction start so we have
 998          * to occasionally drop it.
 999          */
1000         struct rw_semaphore i_mmap_sem;
1001         struct inode vfs_inode;
1002         struct jbd2_inode *jinode;
1003
1004         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1005
1006         /*
1007          * File creation time. Its function is same as that of
1008          * struct timespec64 i_{a,c,m}time in the generic inode.
1009          */
1010         struct timespec64 i_crtime;
1011
1012         /* mballoc */
1013         struct list_head i_prealloc_list;
1014         spinlock_t i_prealloc_lock;
1015
1016         /* extents status tree */
1017         struct ext4_es_tree i_es_tree;
1018         rwlock_t i_es_lock;
1019         struct list_head i_es_list;
1020         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1021         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1022         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1023                                            extents to shrink. Protected by
1024                                            i_es_lock  */
1025
1026         /* ialloc */
1027         ext4_group_t    i_last_alloc_group;
1028
1029         /* allocation reservation info for delalloc */
1030         /* In case of bigalloc, this refer to clusters rather than blocks */
1031         unsigned int i_reserved_data_blocks;
1032         ext4_lblk_t i_da_metadata_calc_last_lblock;
1033         int i_da_metadata_calc_len;
1034
1035         /* pending cluster reservations for bigalloc file systems */
1036         struct ext4_pending_tree i_pending_tree;
1037
1038         /* on-disk additional length */
1039         __u16 i_extra_isize;
1040
1041         /* Indicate the inline data space. */
1042         u16 i_inline_off;
1043         u16 i_inline_size;
1044
1045 #ifdef CONFIG_QUOTA
1046         /* quota space reservation, managed internally by quota code */
1047         qsize_t i_reserved_quota;
1048 #endif
1049
1050         /* Lock protecting lists below */
1051         spinlock_t i_completed_io_lock;
1052         /*
1053          * Completed IOs that need unwritten extents handling and have
1054          * transaction reserved
1055          */
1056         struct list_head i_rsv_conversion_list;
1057         struct work_struct i_rsv_conversion_work;
1058         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1059
1060         spinlock_t i_block_reservation_lock;
1061
1062         /*
1063          * Transactions that contain inode's metadata needed to complete
1064          * fsync and fdatasync, respectively.
1065          */
1066         tid_t i_sync_tid;
1067         tid_t i_datasync_tid;
1068
1069 #ifdef CONFIG_QUOTA
1070         struct dquot *i_dquot[MAXQUOTAS];
1071 #endif
1072
1073         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1074         __u32 i_csum_seed;
1075
1076         kprojid_t i_projid;
1077 };
1078
1079 /*
1080  * File system states
1081  */
1082 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1083 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1084 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1085
1086 /*
1087  * Misc. filesystem flags
1088  */
1089 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1090 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1091 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1092
1093 /*
1094  * Mount flags set via mount options or defaults
1095  */
1096 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1097 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1098 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1099 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1100 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1101 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1102 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1103 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1104 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1105 #ifdef CONFIG_FS_DAX
1106 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1107 #else
1108 #define EXT4_MOUNT_DAX                  0
1109 #endif
1110 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1111 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1112 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1113 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1114 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1115 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1116 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1117 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1118 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1119 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1120 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1121 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1122                                                  * enable enforcement for hidden
1123                                                  * quota files */
1124 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1125                                                   * enforcement for hidden quota
1126                                                   * files */
1127 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1128                                                   * enforcement */
1129 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1130 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1131 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1132 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1133 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1134 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1135 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1136 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1137 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1138
1139 /*
1140  * Mount flags set either automatically (could not be set by mount option)
1141  * based on per file system feature or property or in special cases such as
1142  * distinguishing between explicit mount option definition and default.
1143  */
1144 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1145                                                       specified delalloc */
1146 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1147                                                       size of blocksize * 8
1148                                                       blocks */
1149 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1150                                                       file systems */
1151
1152 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1153                                                 specified journal checksum */
1154
1155 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1156                                                 ~EXT4_MOUNT_##opt
1157 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1158                                                 EXT4_MOUNT_##opt
1159 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1160                                          EXT4_MOUNT_##opt)
1161
1162 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1163                                                 ~EXT4_MOUNT2_##opt
1164 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1165                                                 EXT4_MOUNT2_##opt
1166 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1167                                          EXT4_MOUNT2_##opt)
1168
1169 #define ext4_test_and_set_bit           __test_and_set_bit_le
1170 #define ext4_set_bit                    __set_bit_le
1171 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1172 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1173 #define ext4_clear_bit                  __clear_bit_le
1174 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1175 #define ext4_test_bit                   test_bit_le
1176 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1177 #define ext4_find_next_bit              find_next_bit_le
1178
1179 extern void ext4_set_bits(void *bm, int cur, int len);
1180
1181 /*
1182  * Maximal mount counts between two filesystem checks
1183  */
1184 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1185 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1186
1187 /*
1188  * Behaviour when detecting errors
1189  */
1190 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1191 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1192 #define EXT4_ERRORS_PANIC               3       /* Panic */
1193 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1194
1195 /* Metadata checksum algorithm codes */
1196 #define EXT4_CRC32C_CHKSUM              1
1197
1198 /*
1199  * Structure of the super block
1200  */
1201 struct ext4_super_block {
1202 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1203         __le32  s_blocks_count_lo;      /* Blocks count */
1204         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1205         __le32  s_free_blocks_count_lo; /* Free blocks count */
1206 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1207         __le32  s_first_data_block;     /* First Data Block */
1208         __le32  s_log_block_size;       /* Block size */
1209         __le32  s_log_cluster_size;     /* Allocation cluster size */
1210 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1211         __le32  s_clusters_per_group;   /* # Clusters per group */
1212         __le32  s_inodes_per_group;     /* # Inodes per group */
1213         __le32  s_mtime;                /* Mount time */
1214 /*30*/  __le32  s_wtime;                /* Write time */
1215         __le16  s_mnt_count;            /* Mount count */
1216         __le16  s_max_mnt_count;        /* Maximal mount count */
1217         __le16  s_magic;                /* Magic signature */
1218         __le16  s_state;                /* File system state */
1219         __le16  s_errors;               /* Behaviour when detecting errors */
1220         __le16  s_minor_rev_level;      /* minor revision level */
1221 /*40*/  __le32  s_lastcheck;            /* time of last check */
1222         __le32  s_checkinterval;        /* max. time between checks */
1223         __le32  s_creator_os;           /* OS */
1224         __le32  s_rev_level;            /* Revision level */
1225 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1226         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1227         /*
1228          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1229          *
1230          * Note: the difference between the compatible feature set and
1231          * the incompatible feature set is that if there is a bit set
1232          * in the incompatible feature set that the kernel doesn't
1233          * know about, it should refuse to mount the filesystem.
1234          *
1235          * e2fsck's requirements are more strict; if it doesn't know
1236          * about a feature in either the compatible or incompatible
1237          * feature set, it must abort and not try to meddle with
1238          * things it doesn't understand...
1239          */
1240         __le32  s_first_ino;            /* First non-reserved inode */
1241         __le16  s_inode_size;           /* size of inode structure */
1242         __le16  s_block_group_nr;       /* block group # of this superblock */
1243         __le32  s_feature_compat;       /* compatible feature set */
1244 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1245         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1246 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1247 /*78*/  char    s_volume_name[16];      /* volume name */
1248 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1249 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1250         /*
1251          * Performance hints.  Directory preallocation should only
1252          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1253          */
1254         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1255         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1256         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1257         /*
1258          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1259          */
1260 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1261 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1262         __le32  s_journal_dev;          /* device number of journal file */
1263         __le32  s_last_orphan;          /* start of list of inodes to delete */
1264         __le32  s_hash_seed[4];         /* HTREE hash seed */
1265         __u8    s_def_hash_version;     /* Default hash version to use */
1266         __u8    s_jnl_backup_type;
1267         __le16  s_desc_size;            /* size of group descriptor */
1268 /*100*/ __le32  s_default_mount_opts;
1269         __le32  s_first_meta_bg;        /* First metablock block group */
1270         __le32  s_mkfs_time;            /* When the filesystem was created */
1271         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1272         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1273 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1274         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1275         __le32  s_free_blocks_count_hi; /* Free blocks count */
1276         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1277         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1278         __le32  s_flags;                /* Miscellaneous flags */
1279         __le16  s_raid_stride;          /* RAID stride */
1280         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1281         __le64  s_mmp_block;            /* Block for multi-mount protection */
1282         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1283         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1284         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1285         __u8    s_encryption_level;     /* versioning level for encryption */
1286         __u8    s_reserved_pad;         /* Padding to next 32bits */
1287         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1288         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1289         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1290         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1291                                               snapshot's future use */
1292         __le32  s_snapshot_list;        /* inode number of the head of the
1293                                            on-disk snapshot list */
1294 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1295         __le32  s_error_count;          /* number of fs errors */
1296         __le32  s_first_error_time;     /* first time an error happened */
1297         __le32  s_first_error_ino;      /* inode involved in first error */
1298         __le64  s_first_error_block;    /* block involved of first error */
1299         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1300         __le32  s_first_error_line;     /* line number where error happened */
1301         __le32  s_last_error_time;      /* most recent time of an error */
1302         __le32  s_last_error_ino;       /* inode involved in last error */
1303         __le32  s_last_error_line;      /* line number where error happened */
1304         __le64  s_last_error_block;     /* block involved of last error */
1305         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1306 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1307         __u8    s_mount_opts[64];
1308         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1309         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1310         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1311         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1312         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1313         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1314         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1315         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1316         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1317         __u8    s_wtime_hi;
1318         __u8    s_mtime_hi;
1319         __u8    s_mkfs_time_hi;
1320         __u8    s_lastcheck_hi;
1321         __u8    s_first_error_time_hi;
1322         __u8    s_last_error_time_hi;
1323         __u8    s_pad[2];
1324         __le16  s_encoding;             /* Filename charset encoding */
1325         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1326         __le32  s_reserved[95];         /* Padding to the end of the block */
1327         __le32  s_checksum;             /* crc32c(superblock) */
1328 };
1329
1330 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1331
1332 #ifdef __KERNEL__
1333
1334 /*
1335  * run-time mount flags
1336  */
1337 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1338 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1339 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1340
1341 #ifdef CONFIG_FS_ENCRYPTION
1342 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1343                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1344 #else
1345 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1346 #endif
1347
1348 /* Number of quota types we support */
1349 #define EXT4_MAXQUOTAS 3
1350
1351 #define EXT4_ENC_UTF8_12_1      1
1352
1353 /*
1354  * Flags for ext4_sb_info.s_encoding_flags.
1355  */
1356 #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1357
1358 #define ext4_has_strict_mode(sbi) \
1359         (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1360
1361 /*
1362  * fourth extended-fs super-block data in memory
1363  */
1364 struct ext4_sb_info {
1365         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1366         unsigned long s_inodes_per_block;/* Number of inodes per block */
1367         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1368         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1369         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1370         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1371         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1372         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1373         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1374         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1375         unsigned long s_overhead;  /* # of fs overhead clusters */
1376         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1377         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1378         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1379         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1380         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1381         struct buffer_head **s_group_desc;
1382         unsigned int s_mount_opt;
1383         unsigned int s_mount_opt2;
1384         unsigned int s_mount_flags;
1385         unsigned int s_def_mount_opt;
1386         ext4_fsblk_t s_sb_block;
1387         atomic64_t s_resv_clusters;
1388         kuid_t s_resuid;
1389         kgid_t s_resgid;
1390         unsigned short s_mount_state;
1391         unsigned short s_pad;
1392         int s_addr_per_block_bits;
1393         int s_desc_per_block_bits;
1394         int s_inode_size;
1395         int s_first_ino;
1396         unsigned int s_inode_readahead_blks;
1397         unsigned int s_inode_goal;
1398         u32 s_hash_seed[4];
1399         int s_def_hash_version;
1400         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1401         struct percpu_counter s_freeclusters_counter;
1402         struct percpu_counter s_freeinodes_counter;
1403         struct percpu_counter s_dirs_counter;
1404         struct percpu_counter s_dirtyclusters_counter;
1405         struct blockgroup_lock *s_blockgroup_lock;
1406         struct proc_dir_entry *s_proc;
1407         struct kobject s_kobj;
1408         struct completion s_kobj_unregister;
1409         struct super_block *s_sb;
1410 #ifdef CONFIG_UNICODE
1411         struct unicode_map *s_encoding;
1412         __u16 s_encoding_flags;
1413 #endif
1414
1415         /* Journaling */
1416         struct journal_s *s_journal;
1417         struct list_head s_orphan;
1418         struct mutex s_orphan_lock;
1419         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1420         unsigned long s_commit_interval;
1421         u32 s_max_batch_time;
1422         u32 s_min_batch_time;
1423         struct block_device *journal_bdev;
1424 #ifdef CONFIG_QUOTA
1425         /* Names of quota files with journalled quota */
1426         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1427         int s_jquota_fmt;                       /* Format of quota to use */
1428 #endif
1429         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1430         struct rb_root system_blks;
1431
1432 #ifdef EXTENTS_STATS
1433         /* ext4 extents stats */
1434         unsigned long s_ext_min;
1435         unsigned long s_ext_max;
1436         unsigned long s_depth_max;
1437         spinlock_t s_ext_stats_lock;
1438         unsigned long s_ext_blocks;
1439         unsigned long s_ext_extents;
1440 #endif
1441
1442         /* for buddy allocator */
1443         struct ext4_group_info ***s_group_info;
1444         struct inode *s_buddy_cache;
1445         spinlock_t s_md_lock;
1446         unsigned short *s_mb_offsets;
1447         unsigned int *s_mb_maxs;
1448         unsigned int s_group_info_size;
1449         unsigned int s_mb_free_pending;
1450         struct list_head s_freed_data_list;     /* List of blocks to be freed
1451                                                    after commit completed */
1452
1453         /* tunables */
1454         unsigned long s_stripe;
1455         unsigned int s_mb_stream_request;
1456         unsigned int s_mb_max_to_scan;
1457         unsigned int s_mb_min_to_scan;
1458         unsigned int s_mb_stats;
1459         unsigned int s_mb_order2_reqs;
1460         unsigned int s_mb_group_prealloc;
1461         unsigned int s_max_dir_size_kb;
1462         /* where last allocation was done - for stream allocation */
1463         unsigned long s_mb_last_group;
1464         unsigned long s_mb_last_start;
1465
1466         /* stats for buddy allocator */
1467         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1468         atomic_t s_bal_success; /* we found long enough chunks */
1469         atomic_t s_bal_allocated;       /* in blocks */
1470         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1471         atomic_t s_bal_goals;   /* goal hits */
1472         atomic_t s_bal_breaks;  /* too long searches */
1473         atomic_t s_bal_2orders; /* 2^order hits */
1474         spinlock_t s_bal_lock;
1475         unsigned long s_mb_buddies_generated;
1476         unsigned long long s_mb_generation_time;
1477         atomic_t s_mb_lost_chunks;
1478         atomic_t s_mb_preallocated;
1479         atomic_t s_mb_discarded;
1480         atomic_t s_lock_busy;
1481
1482         /* locality groups */
1483         struct ext4_locality_group __percpu *s_locality_groups;
1484
1485         /* for write statistics */
1486         unsigned long s_sectors_written_start;
1487         u64 s_kbytes_written;
1488
1489         /* the size of zero-out chunk */
1490         unsigned int s_extent_max_zeroout_kb;
1491
1492         unsigned int s_log_groups_per_flex;
1493         struct flex_groups *s_flex_groups;
1494         ext4_group_t s_flex_groups_allocated;
1495
1496         /* workqueue for reserved extent conversions (buffered io) */
1497         struct workqueue_struct *rsv_conversion_wq;
1498
1499         /* timer for periodic error stats printing */
1500         struct timer_list s_err_report;
1501
1502         /* Lazy inode table initialization info */
1503         struct ext4_li_request *s_li_request;
1504         /* Wait multiplier for lazy initialization thread */
1505         unsigned int s_li_wait_mult;
1506
1507         /* Kernel thread for multiple mount protection */
1508         struct task_struct *s_mmp_tsk;
1509
1510         /* record the last minlen when FITRIM is called. */
1511         atomic_t s_last_trim_minblks;
1512
1513         /* Reference to checksum algorithm driver via cryptoapi */
1514         struct crypto_shash *s_chksum_driver;
1515
1516         /* Precomputed FS UUID checksum for seeding other checksums */
1517         __u32 s_csum_seed;
1518
1519         /* Reclaim extents from extent status tree */
1520         struct shrinker s_es_shrinker;
1521         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1522         long s_es_nr_inode;
1523         struct ext4_es_stats s_es_stats;
1524         struct mb_cache *s_ea_block_cache;
1525         struct mb_cache *s_ea_inode_cache;
1526         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1527
1528         /* Ratelimit ext4 messages. */
1529         struct ratelimit_state s_err_ratelimit_state;
1530         struct ratelimit_state s_warning_ratelimit_state;
1531         struct ratelimit_state s_msg_ratelimit_state;
1532
1533         /* Barrier between changing inodes' journal flags and writepages ops. */
1534         struct percpu_rw_semaphore s_journal_flag_rwsem;
1535         struct dax_device *s_daxdev;
1536 };
1537
1538 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1539 {
1540         return sb->s_fs_info;
1541 }
1542 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1543 {
1544         return container_of(inode, struct ext4_inode_info, vfs_inode);
1545 }
1546
1547 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1548 {
1549         return ino == EXT4_ROOT_INO ||
1550                 (ino >= EXT4_FIRST_INO(sb) &&
1551                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1552 }
1553
1554 /*
1555  * Inode dynamic state flags
1556  */
1557 enum {
1558         EXT4_STATE_JDATA,               /* journaled data exists */
1559         EXT4_STATE_NEW,                 /* inode is newly created */
1560         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1561         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1562         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1563         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1564         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1565         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1566         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1567         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1568         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1569         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1570 };
1571
1572 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1573 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1574 {                                                                       \
1575         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1576 }                                                                       \
1577 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1578 {                                                                       \
1579         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1580 }                                                                       \
1581 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1582 {                                                                       \
1583         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1584 }
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_flag(struct inode *inode, int bit);
1589 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1590 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1591 EXT4_INODE_BIT_FNS(flag, flags, 0)
1592
1593 /* Add these declarations here only so that these functions can be
1594  * found by name.  Otherwise, they are very hard to locate. */
1595 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1596 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1597 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1598 #if (BITS_PER_LONG < 64)
1599 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1600
1601 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1602 {
1603         (ei)->i_state_flags = 0;
1604 }
1605 #else
1606 EXT4_INODE_BIT_FNS(state, flags, 32)
1607
1608 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1609 {
1610         /* We depend on the fact that callers will set i_flags */
1611 }
1612 #endif
1613 #else
1614 /* Assume that user mode programs are passing in an ext4fs superblock, not
1615  * a kernel struct super_block.  This will allow us to call the feature-test
1616  * macros from user land. */
1617 #define EXT4_SB(sb)     (sb)
1618 #endif
1619
1620 static inline bool ext4_verity_in_progress(struct inode *inode)
1621 {
1622         return IS_ENABLED(CONFIG_FS_VERITY) &&
1623                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1624 }
1625
1626 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1627
1628 /*
1629  * Codes for operating systems
1630  */
1631 #define EXT4_OS_LINUX           0
1632 #define EXT4_OS_HURD            1
1633 #define EXT4_OS_MASIX           2
1634 #define EXT4_OS_FREEBSD         3
1635 #define EXT4_OS_LITES           4
1636
1637 /*
1638  * Revision levels
1639  */
1640 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1641 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1642
1643 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1644 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1645
1646 #define EXT4_GOOD_OLD_INODE_SIZE 128
1647
1648 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1649 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1650 #define EXT4_TIMESTAMP_MIN              S32_MIN
1651
1652 /*
1653  * Feature set definitions
1654  */
1655
1656 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1657 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1658 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1659 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1660 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1661 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1662 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1663
1664 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1665 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1666 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1667 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1668 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1669 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1670 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1671 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1672 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1673 /*
1674  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1675  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1676  * all other data structures' checksums.  However, the METADATA_CSUM and
1677  * GDT_CSUM bits are mutually exclusive.
1678  */
1679 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1680 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1681 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1682 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
1683
1684 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1685 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1686 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1687 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1688 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1689 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1690 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1691 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1692 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1693 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1694 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1695 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1696 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1697 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1698 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1699 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1700
1701 extern void ext4_update_dynamic_rev(struct super_block *sb);
1702
1703 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1704 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1705 { \
1706         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1707                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1708 } \
1709 static inline void ext4_set_feature_##name(struct super_block *sb) \
1710 { \
1711         ext4_update_dynamic_rev(sb); \
1712         EXT4_SB(sb)->s_es->s_feature_compat |= \
1713                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1714 } \
1715 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1716 { \
1717         EXT4_SB(sb)->s_es->s_feature_compat &= \
1718                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1719 }
1720
1721 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1722 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1723 { \
1724         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1725                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1726 } \
1727 static inline void ext4_set_feature_##name(struct super_block *sb) \
1728 { \
1729         ext4_update_dynamic_rev(sb); \
1730         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1731                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1732 } \
1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1734 { \
1735         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1736                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1737 }
1738
1739 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1740 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1741 { \
1742         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1743                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1744 } \
1745 static inline void ext4_set_feature_##name(struct super_block *sb) \
1746 { \
1747         ext4_update_dynamic_rev(sb); \
1748         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1749                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1750 } \
1751 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1752 { \
1753         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1754                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1755 }
1756
1757 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1758 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1759 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1760 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1761 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1762 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1763 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1764
1765 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1766 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1767 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1768 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1769 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1770 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1771 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1772 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1773 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1774 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1775 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1776 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1777 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
1778
1779 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1780 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1781 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1782 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1783 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1784 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1785 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1786 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1787 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1788 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1789 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1790 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1791 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1792 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1793 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1794 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
1795
1796 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1797 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1798                                          EXT4_FEATURE_INCOMPAT_META_BG)
1799 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1800                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1801                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1802
1803 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1804 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1805                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1806                                          EXT4_FEATURE_INCOMPAT_META_BG)
1807 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1808                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1809                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1810
1811 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1812 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1813                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1814                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1815                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1816                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1817                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1818                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1819                                          EXT4_FEATURE_INCOMPAT_MMP | \
1820                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1821                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1822                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1823                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1824                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1825 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1826                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1827                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1828                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1829                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1830                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1831                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1832                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1833                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1834                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1835                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
1836                                          EXT4_FEATURE_RO_COMPAT_VERITY)
1837
1838 #define EXTN_FEATURE_FUNCS(ver) \
1839 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1840 { \
1841         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1842                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1843 } \
1844 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1845 { \
1846         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1847                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1848 } \
1849 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1850 { \
1851         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1852                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1853 }
1854
1855 EXTN_FEATURE_FUNCS(2)
1856 EXTN_FEATURE_FUNCS(3)
1857 EXTN_FEATURE_FUNCS(4)
1858
1859 static inline bool ext4_has_compat_features(struct super_block *sb)
1860 {
1861         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1862 }
1863 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1864 {
1865         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1866 }
1867 static inline bool ext4_has_incompat_features(struct super_block *sb)
1868 {
1869         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1870 }
1871
1872 /*
1873  * Superblock flags
1874  */
1875 #define EXT4_FLAGS_RESIZING     0
1876 #define EXT4_FLAGS_SHUTDOWN     1
1877
1878 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1879 {
1880         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1881 }
1882
1883
1884 /*
1885  * Default values for user and/or group using reserved blocks
1886  */
1887 #define EXT4_DEF_RESUID         0
1888 #define EXT4_DEF_RESGID         0
1889
1890 /*
1891  * Default project ID
1892  */
1893 #define EXT4_DEF_PROJID         0
1894
1895 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1896
1897 /*
1898  * Default mount options
1899  */
1900 #define EXT4_DEFM_DEBUG         0x0001
1901 #define EXT4_DEFM_BSDGROUPS     0x0002
1902 #define EXT4_DEFM_XATTR_USER    0x0004
1903 #define EXT4_DEFM_ACL           0x0008
1904 #define EXT4_DEFM_UID16         0x0010
1905 #define EXT4_DEFM_JMODE         0x0060
1906 #define EXT4_DEFM_JMODE_DATA    0x0020
1907 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1908 #define EXT4_DEFM_JMODE_WBACK   0x0060
1909 #define EXT4_DEFM_NOBARRIER     0x0100
1910 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1911 #define EXT4_DEFM_DISCARD       0x0400
1912 #define EXT4_DEFM_NODELALLOC    0x0800
1913
1914 /*
1915  * Default journal batch times
1916  */
1917 #define EXT4_DEF_MIN_BATCH_TIME 0
1918 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1919
1920 /*
1921  * Minimum number of groups in a flexgroup before we separate out
1922  * directories into the first block group of a flexgroup
1923  */
1924 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1925
1926 /*
1927  * Structure of a directory entry
1928  */
1929 #define EXT4_NAME_LEN 255
1930
1931 struct ext4_dir_entry {
1932         __le32  inode;                  /* Inode number */
1933         __le16  rec_len;                /* Directory entry length */
1934         __le16  name_len;               /* Name length */
1935         char    name[EXT4_NAME_LEN];    /* File name */
1936 };
1937
1938 /*
1939  * The new version of the directory entry.  Since EXT4 structures are
1940  * stored in intel byte order, and the name_len field could never be
1941  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1942  * file_type field.
1943  */
1944 struct ext4_dir_entry_2 {
1945         __le32  inode;                  /* Inode number */
1946         __le16  rec_len;                /* Directory entry length */
1947         __u8    name_len;               /* Name length */
1948         __u8    file_type;
1949         char    name[EXT4_NAME_LEN];    /* File name */
1950 };
1951
1952 /*
1953  * This is a bogus directory entry at the end of each leaf block that
1954  * records checksums.
1955  */
1956 struct ext4_dir_entry_tail {
1957         __le32  det_reserved_zero1;     /* Pretend to be unused */
1958         __le16  det_rec_len;            /* 12 */
1959         __u8    det_reserved_zero2;     /* Zero name length */
1960         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1961         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1962 };
1963
1964 #define EXT4_DIRENT_TAIL(block, blocksize) \
1965         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1966                                         ((blocksize) - \
1967                                          sizeof(struct ext4_dir_entry_tail))))
1968
1969 /*
1970  * Ext4 directory file types.  Only the low 3 bits are used.  The
1971  * other bits are reserved for now.
1972  */
1973 #define EXT4_FT_UNKNOWN         0
1974 #define EXT4_FT_REG_FILE        1
1975 #define EXT4_FT_DIR             2
1976 #define EXT4_FT_CHRDEV          3
1977 #define EXT4_FT_BLKDEV          4
1978 #define EXT4_FT_FIFO            5
1979 #define EXT4_FT_SOCK            6
1980 #define EXT4_FT_SYMLINK         7
1981
1982 #define EXT4_FT_MAX             8
1983
1984 #define EXT4_FT_DIR_CSUM        0xDE
1985
1986 /*
1987  * EXT4_DIR_PAD defines the directory entries boundaries
1988  *
1989  * NOTE: It must be a multiple of 4
1990  */
1991 #define EXT4_DIR_PAD                    4
1992 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1993 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1994                                          ~EXT4_DIR_ROUND)
1995 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1996
1997 /*
1998  * If we ever get support for fs block sizes > page_size, we'll need
1999  * to remove the #if statements in the next two functions...
2000  */
2001 static inline unsigned int
2002 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2003 {
2004         unsigned len = le16_to_cpu(dlen);
2005
2006 #if (PAGE_SIZE >= 65536)
2007         if (len == EXT4_MAX_REC_LEN || len == 0)
2008                 return blocksize;
2009         return (len & 65532) | ((len & 3) << 16);
2010 #else
2011         return len;
2012 #endif
2013 }
2014
2015 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2016 {
2017         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2018                 BUG();
2019 #if (PAGE_SIZE >= 65536)
2020         if (len < 65536)
2021                 return cpu_to_le16(len);
2022         if (len == blocksize) {
2023                 if (blocksize == 65536)
2024                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2025                 else
2026                         return cpu_to_le16(0);
2027         }
2028         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2029 #else
2030         return cpu_to_le16(len);
2031 #endif
2032 }
2033
2034 /*
2035  * Hash Tree Directory indexing
2036  * (c) Daniel Phillips, 2001
2037  */
2038
2039 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2040                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2041 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2042                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2043 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2044
2045 /* Legal values for the dx_root hash_version field: */
2046
2047 #define DX_HASH_LEGACY                  0
2048 #define DX_HASH_HALF_MD4                1
2049 #define DX_HASH_TEA                     2
2050 #define DX_HASH_LEGACY_UNSIGNED         3
2051 #define DX_HASH_HALF_MD4_UNSIGNED       4
2052 #define DX_HASH_TEA_UNSIGNED            5
2053
2054 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2055                               const void *address, unsigned int length)
2056 {
2057         struct {
2058                 struct shash_desc shash;
2059                 char ctx[4];
2060         } desc;
2061
2062         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2063
2064         desc.shash.tfm = sbi->s_chksum_driver;
2065         *(u32 *)desc.ctx = crc;
2066
2067         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2068
2069         return *(u32 *)desc.ctx;
2070 }
2071
2072 #ifdef __KERNEL__
2073
2074 /* hash info structure used by the directory hash */
2075 struct dx_hash_info
2076 {
2077         u32             hash;
2078         u32             minor_hash;
2079         int             hash_version;
2080         u32             *seed;
2081 };
2082
2083
2084 /* 32 and 64 bit signed EOF for dx directories */
2085 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2086 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2087
2088
2089 /*
2090  * Control parameters used by ext4_htree_next_block
2091  */
2092 #define HASH_NB_ALWAYS          1
2093
2094 struct ext4_filename {
2095         const struct qstr *usr_fname;
2096         struct fscrypt_str disk_name;
2097         struct dx_hash_info hinfo;
2098 #ifdef CONFIG_FS_ENCRYPTION
2099         struct fscrypt_str crypto_buf;
2100 #endif
2101 #ifdef CONFIG_UNICODE
2102         struct fscrypt_str cf_name;
2103 #endif
2104 };
2105
2106 #define fname_name(p) ((p)->disk_name.name)
2107 #define fname_len(p)  ((p)->disk_name.len)
2108
2109 /*
2110  * Describe an inode's exact location on disk and in memory
2111  */
2112 struct ext4_iloc
2113 {
2114         struct buffer_head *bh;
2115         unsigned long offset;
2116         ext4_group_t block_group;
2117 };
2118
2119 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2120 {
2121         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2122 }
2123
2124 static inline bool ext4_is_quota_file(struct inode *inode)
2125 {
2126         return IS_NOQUOTA(inode) &&
2127                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2128 }
2129
2130 /*
2131  * This structure is stuffed into the struct file's private_data field
2132  * for directories.  It is where we put information so that we can do
2133  * readdir operations in hash tree order.
2134  */
2135 struct dir_private_info {
2136         struct rb_root  root;
2137         struct rb_node  *curr_node;
2138         struct fname    *extra_fname;
2139         loff_t          last_pos;
2140         __u32           curr_hash;
2141         __u32           curr_minor_hash;
2142         __u32           next_hash;
2143 };
2144
2145 /* calculate the first block number of the group */
2146 static inline ext4_fsblk_t
2147 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2148 {
2149         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2150                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2151 }
2152
2153 /*
2154  * Special error return code only used by dx_probe() and its callers.
2155  */
2156 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2157
2158 /* htree levels for ext4 */
2159 #define EXT4_HTREE_LEVEL_COMPAT 2
2160 #define EXT4_HTREE_LEVEL        3
2161
2162 static inline int ext4_dir_htree_level(struct super_block *sb)
2163 {
2164         return ext4_has_feature_largedir(sb) ?
2165                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2166 }
2167
2168 /*
2169  * Timeout and state flag for lazy initialization inode thread.
2170  */
2171 #define EXT4_DEF_LI_WAIT_MULT                   10
2172 #define EXT4_DEF_LI_MAX_START_DELAY             5
2173 #define EXT4_LAZYINIT_QUIT                      0x0001
2174 #define EXT4_LAZYINIT_RUNNING                   0x0002
2175
2176 /*
2177  * Lazy inode table initialization info
2178  */
2179 struct ext4_lazy_init {
2180         unsigned long           li_state;
2181         struct list_head        li_request_list;
2182         struct mutex            li_list_mtx;
2183 };
2184
2185 struct ext4_li_request {
2186         struct super_block      *lr_super;
2187         struct ext4_sb_info     *lr_sbi;
2188         ext4_group_t            lr_next_group;
2189         struct list_head        lr_request;
2190         unsigned long           lr_next_sched;
2191         unsigned long           lr_timeout;
2192 };
2193
2194 struct ext4_features {
2195         struct kobject f_kobj;
2196         struct completion f_kobj_unregister;
2197 };
2198
2199 /*
2200  * This structure will be used for multiple mount protection. It will be
2201  * written into the block number saved in the s_mmp_block field in the
2202  * superblock. Programs that check MMP should assume that if
2203  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2204  * to use the filesystem, regardless of how old the timestamp is.
2205  */
2206 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2207 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2208 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2209 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2210
2211 struct mmp_struct {
2212         __le32  mmp_magic;              /* Magic number for MMP */
2213         __le32  mmp_seq;                /* Sequence no. updated periodically */
2214
2215         /*
2216          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2217          * purposes and do not affect the correctness of the algorithm
2218          */
2219         __le64  mmp_time;               /* Time last updated */
2220         char    mmp_nodename[64];       /* Node which last updated MMP block */
2221         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2222
2223         /*
2224          * mmp_check_interval is used to verify if the MMP block has been
2225          * updated on the block device. The value is updated based on the
2226          * maximum time to write the MMP block during an update cycle.
2227          */
2228         __le16  mmp_check_interval;
2229
2230         __le16  mmp_pad1;
2231         __le32  mmp_pad2[226];
2232         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2233 };
2234
2235 /* arguments passed to the mmp thread */
2236 struct mmpd_data {
2237         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2238         struct super_block *sb;  /* super block of the fs */
2239 };
2240
2241 /*
2242  * Check interval multiplier
2243  * The MMP block is written every update interval and initially checked every
2244  * update interval x the multiplier (the value is then adapted based on the
2245  * write latency). The reason is that writes can be delayed under load and we
2246  * don't want readers to incorrectly assume that the filesystem is no longer
2247  * in use.
2248  */
2249 #define EXT4_MMP_CHECK_MULT             2UL
2250
2251 /*
2252  * Minimum interval for MMP checking in seconds.
2253  */
2254 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2255
2256 /*
2257  * Maximum interval for MMP checking in seconds.
2258  */
2259 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2260
2261 /*
2262  * Function prototypes
2263  */
2264
2265 /*
2266  * Ok, these declarations are also in <linux/kernel.h> but none of the
2267  * ext4 source programs needs to include it so they are duplicated here.
2268  */
2269 # define NORET_TYPE     /**/
2270 # define ATTRIB_NORET   __attribute__((noreturn))
2271 # define NORET_AND      noreturn,
2272
2273 /* bitmap.c */
2274 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2275 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2276                                 struct ext4_group_desc *gdp,
2277                                 struct buffer_head *bh, int sz);
2278 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2279                                   struct ext4_group_desc *gdp,
2280                                   struct buffer_head *bh, int sz);
2281 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2282                                 struct ext4_group_desc *gdp,
2283                                 struct buffer_head *bh);
2284 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2285                                   struct ext4_group_desc *gdp,
2286                                   struct buffer_head *bh);
2287
2288 /* balloc.c */
2289 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2290                                          ext4_fsblk_t blocknr,
2291                                          ext4_group_t *blockgrpp,
2292                                          ext4_grpblk_t *offsetp);
2293 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2294                                           ext4_fsblk_t block);
2295
2296 extern unsigned int ext4_block_group(struct super_block *sb,
2297                         ext4_fsblk_t blocknr);
2298 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2299                         ext4_fsblk_t blocknr);
2300 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2301 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2302                         ext4_group_t group);
2303 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2304                                          ext4_fsblk_t goal,
2305                                          unsigned int flags,
2306                                          unsigned long *count,
2307                                          int *errp);
2308 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2309                                     s64 nclusters, unsigned int flags);
2310 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2311 extern void ext4_check_blocks_bitmap(struct super_block *);
2312 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2313                                                     ext4_group_t block_group,
2314                                                     struct buffer_head ** bh);
2315 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2316
2317 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2318                                                 ext4_group_t block_group);
2319 extern int ext4_wait_block_bitmap(struct super_block *sb,
2320                                   ext4_group_t block_group,
2321                                   struct buffer_head *bh);
2322 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2323                                                   ext4_group_t block_group);
2324 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2325                                               ext4_group_t block_group,
2326                                               struct ext4_group_desc *gdp);
2327 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2328
2329 #ifdef CONFIG_UNICODE
2330 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2331                                          const struct qstr *iname,
2332                                          struct fscrypt_str *fname);
2333 #endif
2334
2335 #ifdef CONFIG_FS_ENCRYPTION
2336 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2337                                                 const struct fscrypt_name *src)
2338 {
2339         memset(dst, 0, sizeof(*dst));
2340
2341         dst->usr_fname = src->usr_fname;
2342         dst->disk_name = src->disk_name;
2343         dst->hinfo.hash = src->hash;
2344         dst->hinfo.minor_hash = src->minor_hash;
2345         dst->crypto_buf = src->crypto_buf;
2346 }
2347
2348 static inline int ext4_fname_setup_filename(struct inode *dir,
2349                                             const struct qstr *iname,
2350                                             int lookup,
2351                                             struct ext4_filename *fname)
2352 {
2353         struct fscrypt_name name;
2354         int err;
2355
2356         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2357         if (err)
2358                 return err;
2359
2360         ext4_fname_from_fscrypt_name(fname, &name);
2361
2362 #ifdef CONFIG_UNICODE
2363         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2364 #endif
2365         return 0;
2366 }
2367
2368 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2369                                             struct dentry *dentry,
2370                                             struct ext4_filename *fname)
2371 {
2372         struct fscrypt_name name;
2373         int err;
2374
2375         err = fscrypt_prepare_lookup(dir, dentry, &name);
2376         if (err)
2377                 return err;
2378
2379         ext4_fname_from_fscrypt_name(fname, &name);
2380
2381 #ifdef CONFIG_UNICODE
2382         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2383 #endif
2384         return 0;
2385 }
2386
2387 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2388 {
2389         struct fscrypt_name name;
2390
2391         name.crypto_buf = fname->crypto_buf;
2392         fscrypt_free_filename(&name);
2393
2394         fname->crypto_buf.name = NULL;
2395         fname->usr_fname = NULL;
2396         fname->disk_name.name = NULL;
2397
2398 #ifdef CONFIG_UNICODE
2399         kfree(fname->cf_name.name);
2400         fname->cf_name.name = NULL;
2401 #endif
2402 }
2403 #else /* !CONFIG_FS_ENCRYPTION */
2404 static inline int ext4_fname_setup_filename(struct inode *dir,
2405                                             const struct qstr *iname,
2406                                             int lookup,
2407                                             struct ext4_filename *fname)
2408 {
2409         fname->usr_fname = iname;
2410         fname->disk_name.name = (unsigned char *) iname->name;
2411         fname->disk_name.len = iname->len;
2412
2413 #ifdef CONFIG_UNICODE
2414         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2415 #endif
2416
2417         return 0;
2418 }
2419
2420 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2421                                             struct dentry *dentry,
2422                                             struct ext4_filename *fname)
2423 {
2424         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2425 }
2426
2427 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2428 {
2429 #ifdef CONFIG_UNICODE
2430         kfree(fname->cf_name.name);
2431         fname->cf_name.name = NULL;
2432 #endif
2433 }
2434 #endif /* !CONFIG_FS_ENCRYPTION */
2435
2436 /* dir.c */
2437 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2438                                   struct file *,
2439                                   struct ext4_dir_entry_2 *,
2440                                   struct buffer_head *, char *, int,
2441                                   unsigned int);
2442 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2443         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2444                                         (de), (bh), (buf), (size), (offset)))
2445 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2446                                 __u32 minor_hash,
2447                                 struct ext4_dir_entry_2 *dirent,
2448                                 struct fscrypt_str *ent_name);
2449 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2450 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2451                              struct buffer_head *bh,
2452                              void *buf, int buf_size,
2453                              struct ext4_filename *fname,
2454                              struct ext4_dir_entry_2 **dest_de);
2455 void ext4_insert_dentry(struct inode *inode,
2456                         struct ext4_dir_entry_2 *de,
2457                         int buf_size,
2458                         struct ext4_filename *fname);
2459 static inline void ext4_update_dx_flag(struct inode *inode)
2460 {
2461         if (!ext4_has_feature_dir_index(inode->i_sb))
2462                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2463 }
2464 static const unsigned char ext4_filetype_table[] = {
2465         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2466 };
2467
2468 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2469 {
2470         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2471                 return DT_UNKNOWN;
2472
2473         return ext4_filetype_table[filetype];
2474 }
2475 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2476                              void *buf, int buf_size);
2477
2478 /* fsync.c */
2479 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2480
2481 /* hash.c */
2482 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2483                           struct dx_hash_info *hinfo);
2484
2485 /* ialloc.c */
2486 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2487                                       const struct qstr *qstr, __u32 goal,
2488                                       uid_t *owner, __u32 i_flags,
2489                                       int handle_type, unsigned int line_no,
2490                                       int nblocks);
2491
2492 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2493         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2494                          i_flags, 0, 0, 0)
2495 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2496                                     type, nblocks)                  \
2497         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2498                          0, (type), __LINE__, (nblocks))
2499
2500
2501 extern void ext4_free_inode(handle_t *, struct inode *);
2502 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2503 extern unsigned long ext4_count_free_inodes(struct super_block *);
2504 extern unsigned long ext4_count_dirs(struct super_block *);
2505 extern void ext4_check_inodes_bitmap(struct super_block *);
2506 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2507 extern int ext4_init_inode_table(struct super_block *sb,
2508                                  ext4_group_t group, int barrier);
2509 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2510
2511 /* mballoc.c */
2512 extern const struct seq_operations ext4_mb_seq_groups_ops;
2513 extern long ext4_mb_stats;
2514 extern long ext4_mb_max_to_scan;
2515 extern int ext4_mb_init(struct super_block *);
2516 extern int ext4_mb_release(struct super_block *);
2517 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2518                                 struct ext4_allocation_request *, int *);
2519 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2520 extern void ext4_discard_preallocations(struct inode *);
2521 extern int __init ext4_init_mballoc(void);
2522 extern void ext4_exit_mballoc(void);
2523 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2524                              struct buffer_head *bh, ext4_fsblk_t block,
2525                              unsigned long count, int flags);
2526 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2527                                    ext4_group_t ngroups);
2528 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2529                 ext4_group_t i, struct ext4_group_desc *desc);
2530 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2531                                 ext4_fsblk_t block, unsigned long count);
2532 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2533 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2534
2535 /* inode.c */
2536 int ext4_inode_is_fast_symlink(struct inode *inode);
2537 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2538 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2539 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2540                      bool wait, struct buffer_head **bhs);
2541 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2542                              struct buffer_head *bh_result, int create);
2543 int ext4_get_block(struct inode *inode, sector_t iblock,
2544                    struct buffer_head *bh_result, int create);
2545 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2546                        struct buffer_head *bh_result, int create);
2547 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2548                            struct buffer_head *bh, int create);
2549 int ext4_walk_page_buffers(handle_t *handle,
2550                            struct buffer_head *head,
2551                            unsigned from,
2552                            unsigned to,
2553                            int *partial,
2554                            int (*fn)(handle_t *handle,
2555                                      struct buffer_head *bh));
2556 int do_journal_get_write_access(handle_t *handle,
2557                                 struct buffer_head *bh);
2558 #define FALL_BACK_TO_NONDELALLOC 1
2559 #define CONVERT_INLINE_DATA      2
2560
2561 typedef enum {
2562         EXT4_IGET_NORMAL =      0,
2563         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2564         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2565 } ext4_iget_flags;
2566
2567 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2568                                  ext4_iget_flags flags, const char *function,
2569                                  unsigned int line);
2570
2571 #define ext4_iget(sb, ino, flags) \
2572         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2573
2574 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2575 extern int  ext4_setattr(struct dentry *, struct iattr *);
2576 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2577 extern void ext4_evict_inode(struct inode *);
2578 extern void ext4_clear_inode(struct inode *);
2579 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2580 extern int  ext4_sync_inode(handle_t *, struct inode *);
2581 extern void ext4_dirty_inode(struct inode *, int);
2582 extern int ext4_change_inode_journal_flag(struct inode *, int);
2583 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2584 extern int ext4_inode_attach_jinode(struct inode *inode);
2585 extern int ext4_can_truncate(struct inode *inode);
2586 extern int ext4_truncate(struct inode *);
2587 extern int ext4_break_layouts(struct inode *);
2588 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2589 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2590 extern void ext4_set_inode_flags(struct inode *);
2591 extern int ext4_alloc_da_blocks(struct inode *inode);
2592 extern void ext4_set_aops(struct inode *inode);
2593 extern int ext4_writepage_trans_blocks(struct inode *);
2594 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2595 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2596                              loff_t lstart, loff_t lend);
2597 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2598 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2599 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2600 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2601 extern void ext4_da_release_space(struct inode *inode, int to_free);
2602 extern void ext4_da_update_reserve_space(struct inode *inode,
2603                                         int used, int quota_claim);
2604 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2605                               ext4_fsblk_t pblk, ext4_lblk_t len);
2606
2607 /* indirect.c */
2608 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2609                                 struct ext4_map_blocks *map, int flags);
2610 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2611 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2612 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2613 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2614                                  ext4_lblk_t start, ext4_lblk_t end);
2615
2616 /* ioctl.c */
2617 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2618 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2619
2620 /* migrate.c */
2621 extern int ext4_ext_migrate(struct inode *);
2622 extern int ext4_ind_migrate(struct inode *inode);
2623
2624 /* namei.c */
2625 extern int ext4_dirblock_csum_verify(struct inode *inode,
2626                                      struct buffer_head *bh);
2627 extern int ext4_orphan_add(handle_t *, struct inode *);
2628 extern int ext4_orphan_del(handle_t *, struct inode *);
2629 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2630                                 __u32 start_minor_hash, __u32 *next_hash);
2631 extern int ext4_search_dir(struct buffer_head *bh,
2632                            char *search_buf,
2633                            int buf_size,
2634                            struct inode *dir,
2635                            struct ext4_filename *fname,
2636                            unsigned int offset,
2637                            struct ext4_dir_entry_2 **res_dir);
2638 extern int ext4_generic_delete_entry(handle_t *handle,
2639                                      struct inode *dir,
2640                                      struct ext4_dir_entry_2 *de_del,
2641                                      struct buffer_head *bh,
2642                                      void *entry_buf,
2643                                      int buf_size,
2644                                      int csum_size);
2645 extern bool ext4_empty_dir(struct inode *inode);
2646
2647 /* resize.c */
2648 extern int ext4_group_add(struct super_block *sb,
2649                                 struct ext4_new_group_data *input);
2650 extern int ext4_group_extend(struct super_block *sb,
2651                                 struct ext4_super_block *es,
2652                                 ext4_fsblk_t n_blocks_count);
2653 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2654
2655 /* super.c */
2656 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2657                                          sector_t block, int op_flags);
2658 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2659 extern int ext4_calculate_overhead(struct super_block *sb);
2660 extern void ext4_superblock_csum_set(struct super_block *sb);
2661 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2662 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2663 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2664                                     ext4_group_t ngroup);
2665 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2666                                      char nbuf[16]);
2667 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2668                                              ext4_group_t block_group,
2669                                              unsigned int flags);
2670
2671 extern __printf(4, 5)
2672 void __ext4_error(struct super_block *, const char *, unsigned int,
2673                   const char *, ...);
2674 extern __printf(5, 6)
2675 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2676                       const char *, ...);
2677 extern __printf(5, 6)
2678 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2679                      const char *, ...);
2680 extern void __ext4_std_error(struct super_block *, const char *,
2681                              unsigned int, int);
2682 extern __printf(4, 5)
2683 void __ext4_abort(struct super_block *, const char *, unsigned int,
2684                   const char *, ...);
2685 extern __printf(4, 5)
2686 void __ext4_warning(struct super_block *, const char *, unsigned int,
2687                     const char *, ...);
2688 extern __printf(4, 5)
2689 void __ext4_warning_inode(const struct inode *inode, const char *function,
2690                           unsigned int line, const char *fmt, ...);
2691 extern __printf(3, 4)
2692 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2693 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2694                            const char *, unsigned int, const char *);
2695 extern __printf(7, 8)
2696 void __ext4_grp_locked_error(const char *, unsigned int,
2697                              struct super_block *, ext4_group_t,
2698                              unsigned long, ext4_fsblk_t,
2699                              const char *, ...);
2700
2701 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2702         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2703
2704 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2705         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2706
2707 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2708         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2709
2710 #ifdef CONFIG_PRINTK
2711
2712 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2713         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2714 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2715         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2716 #define ext4_error(sb, fmt, ...)                                        \
2717         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2718 #define ext4_abort(sb, fmt, ...)                                        \
2719         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2720 #define ext4_warning(sb, fmt, ...)                                      \
2721         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2722 #define ext4_warning_inode(inode, fmt, ...)                             \
2723         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2724 #define ext4_msg(sb, level, fmt, ...)                           \
2725         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2726 #define dump_mmp_msg(sb, mmp, msg)                                      \
2727         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2728 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2729         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2730                                 fmt, ##__VA_ARGS__)
2731
2732 #else
2733
2734 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2735 do {                                                                    \
2736         no_printk(fmt, ##__VA_ARGS__);                                  \
2737         __ext4_error_inode(inode, "", 0, block, " ");                   \
2738 } while (0)
2739 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2740 do {                                                                    \
2741         no_printk(fmt, ##__VA_ARGS__);                                  \
2742         __ext4_error_file(file, "", 0, block, " ");                     \
2743 } while (0)
2744 #define ext4_error(sb, fmt, ...)                                        \
2745 do {                                                                    \
2746         no_printk(fmt, ##__VA_ARGS__);                                  \
2747         __ext4_error(sb, "", 0, " ");                                   \
2748 } while (0)
2749 #define ext4_abort(sb, fmt, ...)                                        \
2750 do {                                                                    \
2751         no_printk(fmt, ##__VA_ARGS__);                                  \
2752         __ext4_abort(sb, "", 0, " ");                                   \
2753 } while (0)
2754 #define ext4_warning(sb, fmt, ...)                                      \
2755 do {                                                                    \
2756         no_printk(fmt, ##__VA_ARGS__);                                  \
2757         __ext4_warning(sb, "", 0, " ");                                 \
2758 } while (0)
2759 #define ext4_warning_inode(inode, fmt, ...)                             \
2760 do {                                                                    \
2761         no_printk(fmt, ##__VA_ARGS__);                                  \
2762         __ext4_warning_inode(inode, "", 0, " ");                        \
2763 } while (0)
2764 #define ext4_msg(sb, level, fmt, ...)                                   \
2765 do {                                                                    \
2766         no_printk(fmt, ##__VA_ARGS__);                                  \
2767         __ext4_msg(sb, "", " ");                                        \
2768 } while (0)
2769 #define dump_mmp_msg(sb, mmp, msg)                                      \
2770         __dump_mmp_msg(sb, mmp, "", 0, "")
2771 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2772 do {                                                                    \
2773         no_printk(fmt, ##__VA_ARGS__);                          \
2774         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2775 } while (0)
2776
2777 #endif
2778
2779 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2780                                         __u32 compat);
2781 extern int ext4_update_rocompat_feature(handle_t *handle,
2782                                         struct super_block *sb, __u32 rocompat);
2783 extern int ext4_update_incompat_feature(handle_t *handle,
2784                                         struct super_block *sb, __u32 incompat);
2785 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2786                                       struct ext4_group_desc *bg);
2787 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2788                                       struct ext4_group_desc *bg);
2789 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2790                                      struct ext4_group_desc *bg);
2791 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2792                                       struct ext4_group_desc *bg);
2793 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2794                                  struct ext4_group_desc *bg);
2795 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2796                                 struct ext4_group_desc *bg);
2797 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2798                                    struct ext4_group_desc *bg);
2799 extern void ext4_block_bitmap_set(struct super_block *sb,
2800                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2801 extern void ext4_inode_bitmap_set(struct super_block *sb,
2802                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2803 extern void ext4_inode_table_set(struct super_block *sb,
2804                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2805 extern void ext4_free_group_clusters_set(struct super_block *sb,
2806                                          struct ext4_group_desc *bg,
2807                                          __u32 count);
2808 extern void ext4_free_inodes_set(struct super_block *sb,
2809                                 struct ext4_group_desc *bg, __u32 count);
2810 extern void ext4_used_dirs_set(struct super_block *sb,
2811                                 struct ext4_group_desc *bg, __u32 count);
2812 extern void ext4_itable_unused_set(struct super_block *sb,
2813                                    struct ext4_group_desc *bg, __u32 count);
2814 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2815                                        struct ext4_group_desc *gdp);
2816 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2817                                      struct ext4_group_desc *gdp);
2818 extern int ext4_register_li_request(struct super_block *sb,
2819                                     ext4_group_t first_not_zeroed);
2820
2821 static inline int ext4_has_metadata_csum(struct super_block *sb)
2822 {
2823         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2824                      !EXT4_SB(sb)->s_chksum_driver);
2825
2826         return ext4_has_feature_metadata_csum(sb) &&
2827                (EXT4_SB(sb)->s_chksum_driver != NULL);
2828 }
2829
2830 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2831 {
2832         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2833 }
2834
2835 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2836 {
2837         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2838                 le32_to_cpu(es->s_blocks_count_lo);
2839 }
2840
2841 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2842 {
2843         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2844                 le32_to_cpu(es->s_r_blocks_count_lo);
2845 }
2846
2847 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2848 {
2849         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2850                 le32_to_cpu(es->s_free_blocks_count_lo);
2851 }
2852
2853 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2854                                          ext4_fsblk_t blk)
2855 {
2856         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2857         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2858 }
2859
2860 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2861                                               ext4_fsblk_t blk)
2862 {
2863         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2864         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2865 }
2866
2867 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2868                                            ext4_fsblk_t blk)
2869 {
2870         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2871         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2872 }
2873
2874 static inline loff_t ext4_isize(struct super_block *sb,
2875                                 struct ext4_inode *raw_inode)
2876 {
2877         if (ext4_has_feature_largedir(sb) ||
2878             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2879                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2880                         le32_to_cpu(raw_inode->i_size_lo);
2881
2882         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2883 }
2884
2885 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2886 {
2887         raw_inode->i_size_lo = cpu_to_le32(i_size);
2888         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2889 }
2890
2891 static inline
2892 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2893                                             ext4_group_t group)
2894 {
2895          struct ext4_group_info ***grp_info;
2896          long indexv, indexh;
2897          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2898          grp_info = EXT4_SB(sb)->s_group_info;
2899          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2900          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2901          return grp_info[indexv][indexh];
2902 }
2903
2904 /*
2905  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2906  * the locking protocol documented in the comments of ext4_group_add()
2907  * in resize.c
2908  */
2909 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2910 {
2911         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2912
2913         smp_rmb();
2914         return ngroups;
2915 }
2916
2917 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2918                                              ext4_group_t block_group)
2919 {
2920         return block_group >> sbi->s_log_groups_per_flex;
2921 }
2922
2923 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2924 {
2925         return 1 << sbi->s_log_groups_per_flex;
2926 }
2927
2928 #define ext4_std_error(sb, errno)                               \
2929 do {                                                            \
2930         if ((errno))                                            \
2931                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2932 } while (0)
2933
2934 #ifdef CONFIG_SMP
2935 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2936  * counters. So we need to make sure we have free clusters more
2937  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2938  */
2939 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2940 #else
2941 #define EXT4_FREECLUSTERS_WATERMARK 0
2942 #endif
2943
2944 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2945 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2946 {
2947         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2948                      !inode_is_locked(inode));
2949         down_write(&EXT4_I(inode)->i_data_sem);
2950         if (newsize > EXT4_I(inode)->i_disksize)
2951                 EXT4_I(inode)->i_disksize = newsize;
2952         up_write(&EXT4_I(inode)->i_data_sem);
2953 }
2954
2955 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2956 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2957 {
2958         int changed = 0;
2959
2960         if (newsize > inode->i_size) {
2961                 i_size_write(inode, newsize);
2962                 changed = 1;
2963         }
2964         if (newsize > EXT4_I(inode)->i_disksize) {
2965                 ext4_update_i_disksize(inode, newsize);
2966                 changed |= 2;
2967         }
2968         return changed;
2969 }
2970
2971 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2972                                       loff_t len);
2973
2974 struct ext4_group_info {
2975         unsigned long   bb_state;
2976         struct rb_root  bb_free_root;
2977         ext4_grpblk_t   bb_first_free;  /* first free block */
2978         ext4_grpblk_t   bb_free;        /* total free blocks */
2979         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2980         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2981         struct          list_head bb_prealloc_list;
2982 #ifdef DOUBLE_CHECK
2983         void            *bb_bitmap;
2984 #endif
2985         struct rw_semaphore alloc_sem;
2986         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2987                                          * regions, index is order.
2988                                          * bb_counters[3] = 5 means
2989                                          * 5 free 8-block regions. */
2990 };
2991
2992 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2993 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2994 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2995 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2996 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
2997         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2998 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
2999         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3000
3001 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3002         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3003 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3004         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3005 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3006         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3007
3008 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3009         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3010 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3011         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3012 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3013         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3014
3015 #define EXT4_MAX_CONTENTION             8
3016 #define EXT4_CONTENTION_THRESHOLD       2
3017
3018 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3019                                               ext4_group_t group)
3020 {
3021         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3022 }
3023
3024 /*
3025  * Returns true if the filesystem is busy enough that attempts to
3026  * access the block group locks has run into contention.
3027  */
3028 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3029 {
3030         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3031 }
3032
3033 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3034 {
3035         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3036         if (spin_trylock(lock))
3037                 /*
3038                  * We're able to grab the lock right away, so drop the
3039                  * lock contention counter.
3040                  */
3041                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3042         else {
3043                 /*
3044                  * The lock is busy, so bump the contention counter,
3045                  * and then wait on the spin lock.
3046                  */
3047                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3048                                   EXT4_MAX_CONTENTION);
3049                 spin_lock(lock);
3050         }
3051 }
3052
3053 static inline void ext4_unlock_group(struct super_block *sb,
3054                                         ext4_group_t group)
3055 {
3056         spin_unlock(ext4_group_lock_ptr(sb, group));
3057 }
3058
3059 /*
3060  * Block validity checking
3061  */
3062 #define ext4_check_indirect_blockref(inode, bh)                         \
3063         ext4_check_blockref(__func__, __LINE__, inode,                  \
3064                             (__le32 *)(bh)->b_data,                     \
3065                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3066
3067 #define ext4_ind_check_inode(inode)                                     \
3068         ext4_check_blockref(__func__, __LINE__, inode,                  \
3069                             EXT4_I(inode)->i_data,                      \
3070                             EXT4_NDIR_BLOCKS)
3071
3072 /*
3073  * Inodes and files operations
3074  */
3075
3076 /* dir.c */
3077 extern const struct file_operations ext4_dir_operations;
3078
3079 #ifdef CONFIG_UNICODE
3080 extern const struct dentry_operations ext4_dentry_ops;
3081 #endif
3082
3083 /* file.c */
3084 extern const struct inode_operations ext4_file_inode_operations;
3085 extern const struct file_operations ext4_file_operations;
3086 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3087
3088 /* inline.c */
3089 extern int ext4_get_max_inline_size(struct inode *inode);
3090 extern int ext4_find_inline_data_nolock(struct inode *inode);
3091 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3092                                  unsigned int len);
3093 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3094
3095 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3096 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3097                                          struct inode *inode,
3098                                          loff_t pos, unsigned len,
3099                                          unsigned flags,
3100                                          struct page **pagep);
3101 extern int ext4_write_inline_data_end(struct inode *inode,
3102                                       loff_t pos, unsigned len,
3103                                       unsigned copied,
3104                                       struct page *page);
3105 extern struct buffer_head *
3106 ext4_journalled_write_inline_data(struct inode *inode,
3107                                   unsigned len,
3108                                   struct page *page);
3109 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3110                                            struct inode *inode,
3111                                            loff_t pos, unsigned len,
3112                                            unsigned flags,
3113                                            struct page **pagep,
3114                                            void **fsdata);
3115 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3116                                          unsigned len, unsigned copied,
3117                                          struct page *page);
3118 extern int ext4_try_add_inline_entry(handle_t *handle,
3119                                      struct ext4_filename *fname,
3120                                      struct inode *dir, struct inode *inode);
3121 extern int ext4_try_create_inline_dir(handle_t *handle,
3122                                       struct inode *parent,
3123                                       struct inode *inode);
3124 extern int ext4_read_inline_dir(struct file *filp,
3125                                 struct dir_context *ctx,
3126                                 int *has_inline_data);
3127 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3128                                   struct inode *dir, ext4_lblk_t block,
3129                                   struct dx_hash_info *hinfo,
3130                                   __u32 start_hash, __u32 start_minor_hash,
3131                                   int *has_inline_data);
3132 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3133                                         struct ext4_filename *fname,
3134                                         struct ext4_dir_entry_2 **res_dir,
3135                                         int *has_inline_data);
3136 extern int ext4_delete_inline_entry(handle_t *handle,
3137                                     struct inode *dir,
3138                                     struct ext4_dir_entry_2 *de_del,
3139                                     struct buffer_head *bh,
3140                                     int *has_inline_data);
3141 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3142 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3143                                         struct ext4_dir_entry_2 **parent_de,
3144                                         int *retval);
3145 extern int ext4_inline_data_fiemap(struct inode *inode,
3146                                    struct fiemap_extent_info *fieinfo,
3147                                    int *has_inline, __u64 start, __u64 len);
3148
3149 struct iomap;
3150 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3151
3152 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3153
3154 extern int ext4_convert_inline_data(struct inode *inode);
3155
3156 static inline int ext4_has_inline_data(struct inode *inode)
3157 {
3158         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3159                EXT4_I(inode)->i_inline_off;
3160 }
3161
3162 /* namei.c */
3163 extern const struct inode_operations ext4_dir_inode_operations;
3164 extern const struct inode_operations ext4_special_inode_operations;
3165 extern struct dentry *ext4_get_parent(struct dentry *child);
3166 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3167                                  struct ext4_dir_entry_2 *de,
3168                                  int blocksize, int csum_size,
3169                                  unsigned int parent_ino, int dotdot_real_len);
3170 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3171                                         unsigned int blocksize);
3172 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3173                                       struct buffer_head *bh);
3174 extern int ext4_ci_compare(const struct inode *parent,
3175                            const struct qstr *fname,
3176                            const struct qstr *entry, bool quick);
3177
3178 #define S_SHIFT 12
3179 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3180         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3181         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3182         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3183         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3184         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3185         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3186         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3187 };
3188
3189 static inline void ext4_set_de_type(struct super_block *sb,
3190                                 struct ext4_dir_entry_2 *de,
3191                                 umode_t mode) {
3192         if (ext4_has_feature_filetype(sb))
3193                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3194 }
3195
3196 /* readpages.c */
3197 extern int ext4_mpage_readpages(struct address_space *mapping,
3198                                 struct list_head *pages, struct page *page,
3199                                 unsigned nr_pages, bool is_readahead);
3200 extern int __init ext4_init_post_read_processing(void);
3201 extern void ext4_exit_post_read_processing(void);
3202
3203 /* symlink.c */
3204 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3205 extern const struct inode_operations ext4_symlink_inode_operations;
3206 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3207
3208 /* sysfs.c */
3209 extern int ext4_register_sysfs(struct super_block *sb);
3210 extern void ext4_unregister_sysfs(struct super_block *sb);
3211 extern int __init ext4_init_sysfs(void);
3212 extern void ext4_exit_sysfs(void);
3213
3214 /* block_validity */
3215 extern void ext4_release_system_zone(struct super_block *sb);
3216 extern int ext4_setup_system_zone(struct super_block *sb);
3217 extern int __init ext4_init_system_zone(void);
3218 extern void ext4_exit_system_zone(void);
3219 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3220                                  ext4_fsblk_t start_blk,
3221                                  unsigned int count);
3222 extern int ext4_check_blockref(const char *, unsigned int,
3223                                struct inode *, __le32 *, unsigned int);
3224
3225 /* extents.c */
3226 struct ext4_ext_path;
3227 struct ext4_extent;
3228
3229 /*
3230  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3231  * __le32.
3232  */
3233 #define EXT_MAX_BLOCKS  0xffffffff
3234
3235 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3236 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3237 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3238 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3239                                struct ext4_map_blocks *map, int flags);
3240 extern int ext4_ext_truncate(handle_t *, struct inode *);
3241 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3242                                  ext4_lblk_t end);
3243 extern void ext4_ext_init(struct super_block *);
3244 extern void ext4_ext_release(struct super_block *);
3245 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3246                           loff_t len);
3247 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3248                                           loff_t offset, ssize_t len);
3249 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3250                            struct ext4_map_blocks *map, int flags);
3251 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3252                                          ext4_lblk_t lblocks);
3253 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3254                                                    int num,
3255                                                    struct ext4_ext_path *path);
3256 extern int ext4_can_extents_be_merged(struct inode *inode,
3257                                       struct ext4_extent *ex1,
3258                                       struct ext4_extent *ex2);
3259 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3260                                   struct ext4_ext_path **,
3261                                   struct ext4_extent *, int);
3262 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3263                                               struct ext4_ext_path **,
3264                                               int flags);
3265 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3266 extern int ext4_ext_check_inode(struct inode *inode);
3267 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3268 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3269                         __u64 start, __u64 len);
3270 extern int ext4_ext_precache(struct inode *inode);
3271 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3272 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3273 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3274                                 struct inode *inode2, ext4_lblk_t lblk1,
3275                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3276                              int mark_unwritten,int *err);
3277 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3278
3279 /* move_extent.c */
3280 extern void ext4_double_down_write_data_sem(struct inode *first,
3281                                             struct inode *second);
3282 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3283                                           struct inode *donor_inode);
3284 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3285                              __u64 start_orig, __u64 start_donor,
3286                              __u64 len, __u64 *moved_len);
3287
3288 /* page-io.c */
3289 extern int __init ext4_init_pageio(void);
3290 extern void ext4_exit_pageio(void);
3291 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3292 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3293 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3294 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3295 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3296                                 struct writeback_control *wbc);
3297 extern void ext4_end_io_rsv_work(struct work_struct *work);
3298 extern void ext4_io_submit(struct ext4_io_submit *io);
3299 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3300                                struct page *page,
3301                                int len,
3302                                struct writeback_control *wbc,
3303                                bool keep_towrite);
3304
3305 /* mmp.c */
3306 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3307
3308 /* verity.c */
3309 extern const struct fsverity_operations ext4_verityops;
3310
3311 /*
3312  * Add new method to test whether block and inode bitmaps are properly
3313  * initialized. With uninit_bg reading the block from disk is not enough
3314  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3315  */
3316 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3317
3318 static inline int bitmap_uptodate(struct buffer_head *bh)
3319 {
3320         return (buffer_uptodate(bh) &&
3321                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3322 }
3323 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3324 {
3325         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3326 }
3327
3328 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3329
3330 /* For ioend & aio unwritten conversion wait queues */
3331 #define EXT4_WQ_HASH_SZ         37
3332 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3333                                             EXT4_WQ_HASH_SZ])
3334 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3335
3336 extern int ext4_resize_begin(struct super_block *sb);
3337 extern void ext4_resize_end(struct super_block *sb);
3338
3339 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3340                                               struct ext4_io_end *io_end)
3341 {
3342         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3343                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3344                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3345         }
3346 }
3347
3348 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3349 {
3350         struct inode *inode = io_end->inode;
3351
3352         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3353                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3354                 /* Wake up anyone waiting on unwritten extent conversion */
3355                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3356                         wake_up_all(ext4_ioend_wq(inode));
3357         }
3358 }
3359
3360 extern const struct iomap_ops ext4_iomap_ops;
3361
3362 #endif  /* __KERNEL__ */
3363
3364 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3365 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3366
3367 #endif  /* _EXT4_H */