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
  45 #include <linux/compiler.h>
  46
  47 /*
  48  * The fourth extended filesystem constants/structures
  49  */
  50
  51 /*
  52  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  53  * structures. these checks slow things down a lot
  54  */
  55 #define AGGRESSIVE_CHECK__
  56
  57 /*
  58  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  59  * bitmaps, maintains and uses them to check for double allocations
  60  */
  61 #define DOUBLE_CHECK__
  62
  63 /*
  64  * Define EXT4FS_DEBUG to produce debug messages
  65  */
  66 #undef EXT4FS_DEBUG
  67
  68 /*
  69  * Debug code
  70  */
  71 #ifdef EXT4FS_DEBUG
  72 #define ext4_debug(f, a...)                                             \
  73         do {                                                            \
  74                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  75                         __FILE__, __LINE__, __func__);                  \
  76                 printk(KERN_DEBUG f, ## a);                             \
  77         } while (0)
  78 #else
  79 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  80 #endif
  81
  82 /*
  83  * Turn on EXT_DEBUG to get lots of info about extents operations.
  84  */
  85 #define EXT_DEBUG__
  86 #ifdef EXT_DEBUG
  87 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  88 #else
  89 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  90 #endif
  91
  92 /* data type for block offset of block group */
  93 typedef int ext4_grpblk_t;
  94
  95 /* data type for filesystem-wide blocks number */
  96 typedef unsigned long long ext4_fsblk_t;
  97
  98 /* data type for file logical block number */
  99 typedef __u32 ext4_lblk_t;
 100
 101 /* data type for block group number */
 102 typedef unsigned int ext4_group_t;
 103
 104 enum SHIFT_DIRECTION {
 105         SHIFT_LEFT = 0,
 106         SHIFT_RIGHT,
 107 };
 108
 109 /*
 110  * Flags used in mballoc's allocation_context flags field.
 111  *
 112  * Also used to show what's going on for debugging purposes when the
 113  * flag field is exported via the traceport interface
 114  */
 115
 116 /* prefer goal again. length */
 117 #define EXT4_MB_HINT_MERGE              0x0001
 118 /* blocks already reserved */
 119 #define EXT4_MB_HINT_RESERVED           0x0002
 120 /* metadata is being allocated */
 121 #define EXT4_MB_HINT_METADATA           0x0004
 122 /* first blocks in the file */
 123 #define EXT4_MB_HINT_FIRST              0x0008
 124 /* search for the best chunk */
 125 #define EXT4_MB_HINT_BEST               0x0010
 126 /* data is being allocated */
 127 #define EXT4_MB_HINT_DATA               0x0020
 128 /* don't preallocate (for tails) */
 129 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 130 /* allocate for locality group */
 131 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 132 /* allocate goal blocks or none */
 133 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 134 /* goal is meaningful */
 135 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 136 /* blocks already pre-reserved by delayed allocation */
 137 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 138 /* We are doing stream allocation */
 139 #define EXT4_MB_STREAM_ALLOC            0x0800
 140 /* Use reserved root blocks if needed */
 141 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 142 /* Use blocks from reserved pool */
 143 #define EXT4_MB_USE_RESERVED            0x2000
 144
 145 struct ext4_allocation_request {
 146         /* target inode for block we're allocating */
 147         struct inode *inode;
 148         /* how many blocks we want to allocate */
 149         unsigned int len;
 150         /* logical block in target inode */
 151         ext4_lblk_t logical;
 152         /* the closest logical allocated block to the left */
 153         ext4_lblk_t lleft;
 154         /* the closest logical allocated block to the right */
 155         ext4_lblk_t lright;
 156         /* phys. target (a hint) */
 157         ext4_fsblk_t goal;
 158         /* phys. block for the closest logical allocated block to the left */
 159         ext4_fsblk_t pleft;
 160         /* phys. block for the closest logical allocated block to the right */
 161         ext4_fsblk_t pright;
 162         /* flags. see above EXT4_MB_HINT_* */
 163         unsigned int flags;
 164 };
 165
 166 /*
 167  * Logical to physical block mapping, used by ext4_map_blocks()
 168  *
 169  * This structure is used to pass requests into ext4_map_blocks() as
 170  * well as to store the information returned by ext4_map_blocks().  It
 171  * takes less room on the stack than a struct buffer_head.
 172  */
 173 #define EXT4_MAP_NEW            (1 << BH_New)
 174 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 175 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 176 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 177 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 178                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 179
 180 struct ext4_map_blocks {
 181         ext4_fsblk_t m_pblk;
 182         ext4_lblk_t m_lblk;
 183         unsigned int m_len;
 184         unsigned int m_flags;
 185 };
 186
 187 /*
 188  * Flags for ext4_io_end->flags
 189  */
 190 #define EXT4_IO_END_UNWRITTEN   0x0001
 191
 192 /*
 193  * For converting unwritten extents on a work queue. 'handle' is used for
 194  * buffered writeback.
 195  */
 196 typedef struct ext4_io_end {
 197         struct list_head        list;           /* per-file finished IO list */
 198         handle_t                *handle;        /* handle reserved for extent
 199                                                  * conversion */
 200         struct inode            *inode;         /* file being written to */
 201         struct bio              *bio;           /* Linked list of completed
 202                                                  * bios covering the extent */
 203         unsigned int            flag;           /* unwritten or not */
 204         atomic_t                count;          /* reference counter */
 205         loff_t                  offset;         /* offset in the file */
 206         ssize_t                 size;           /* size of the extent */
 207 } ext4_io_end_t;
 208
 209 struct ext4_io_submit {
 210         struct writeback_control *io_wbc;
 211         struct bio              *io_bio;
 212         ext4_io_end_t           *io_end;
 213         sector_t                io_next_block;
 214 };
 215
 216 /*
 217  * Special inodes numbers
 218  */
 219 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 220 #define EXT4_ROOT_INO            2      /* Root inode */
 221 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 222 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 223 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 224 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 225 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 226 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 227
 228 /* First non-reserved inode for old ext4 filesystems */
 229 #define EXT4_GOOD_OLD_FIRST_INO 11
 230
 231 /*
 232  * Maximal count of links to a file
 233  */
 234 #define EXT4_LINK_MAX           65000
 235
 236 /*
 237  * Macro-instructions used to manage several block sizes
 238  */
 239 #define EXT4_MIN_BLOCK_SIZE             1024
 240 #define EXT4_MAX_BLOCK_SIZE             65536
 241 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 242 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 243 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 244 #ifdef __KERNEL__
 245 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 246 #else
 247 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 248 #endif
 249 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 250 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 251                                          EXT4_SB(s)->s_cluster_bits)
 252 #ifdef __KERNEL__
 253 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 254 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 255 #else
 256 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 257 #endif
 258 #ifdef __KERNEL__
 259 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 260 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 261 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 262 #else
 263 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 264                                  EXT4_GOOD_OLD_INODE_SIZE : \
 265                                  (s)->s_inode_size)
 266 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 267                                  EXT4_GOOD_OLD_FIRST_INO : \
 268                                  (s)->s_first_ino)
 269 #endif
 270 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 271 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 272         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 273                                                                   blkbits))
 274
 275 /* Translate a block number to a cluster number */
 276 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 277 /* Translate a cluster number to a block number */
 278 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 279 /* Translate # of blks to # of clusters */
 280 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 281                                  (sbi)->s_cluster_bits)
 282 /* Mask out the low bits to get the starting block of the cluster */
 283 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 284                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 285 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 286                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 287 /* Get the cluster offset */
 288 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 289                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 290 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 291                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 292
 293 /*
 294  * Structure of a blocks group descriptor
 295  */
 296 struct ext4_group_desc
 297 {
 298         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 299         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 300         __le32  bg_inode_table_lo;      /* Inodes table block */
 301         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 302         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 303         __le16  bg_used_dirs_count_lo;  /* Directories count */
 304         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 305         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 306         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 307         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 308         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 309         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 310         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 311         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 312         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 313         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 314         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 315         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 316         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 317         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 318         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 319         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 320         __u32   bg_reserved;
 321 };
 322
 323 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 324         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 325          sizeof(__le16))
 326 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 327         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 328          sizeof(__le16))
 329
 330 /*
 331  * Structure of a flex block group info
 332  */
 333
 334 struct flex_groups {
 335         atomic64_t      free_clusters;
 336         atomic_t        free_inodes;
 337         atomic_t        used_dirs;
 338 };
 339
 340 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 341 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 342 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 343
 344 /*
 345  * Macro-instructions used to manage group descriptors
 346  */
 347 #define EXT4_MIN_DESC_SIZE              32
 348 #define EXT4_MIN_DESC_SIZE_64BIT        64
 349 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 350 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 351 #ifdef __KERNEL__
 352 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 353 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 354 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 355 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 356 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 357 #else
 358 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 359 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 360 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 361 #endif
 362
 363 /*
 364  * Constants relative to the data blocks
 365  */
 366 #define EXT4_NDIR_BLOCKS                12
 367 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 368 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 369 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 370 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 371
 372 /*
 373  * Inode flags
 374  */
 375 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 376 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 377 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 378 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 379 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 380 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 381 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 382 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 383 /* Reserved for compression usage... */
 384 #define EXT4_DIRTY_FL                   0x00000100
 385 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 386 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 387         /* nb: was previously EXT2_ECOMPR_FL */
 388 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 389 /* End compression flags --- maybe not all used */
 390 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 391 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 392 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 393 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 394 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 395 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 396 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 397 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 398 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 399 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 400 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 401 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 402 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded file */
 403 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 404
 405 #define EXT4_FL_USER_VISIBLE            0x704BDFFF /* User visible flags */
 406 #define EXT4_FL_USER_MODIFIABLE         0x604BC0FF /* User modifiable flags */
 407
 408 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 409 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 410                                          EXT4_IMMUTABLE_FL | \
 411                                          EXT4_APPEND_FL | \
 412                                          EXT4_NODUMP_FL | \
 413                                          EXT4_NOATIME_FL | \
 414                                          EXT4_PROJINHERIT_FL)
 415
 416 /* Flags that should be inherited by new inodes from their parent. */
 417 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 418                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 419                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 420                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 421                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
 422
 423 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 424 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL))
 425
 426 /* Flags that are appropriate for non-directories/regular files. */
 427 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 428
 429 /* The only flags that should be swapped */
 430 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 431
 432 /* Mask out flags that are inappropriate for the given type of inode. */
 433 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 434 {
 435         if (S_ISDIR(mode))
 436                 return flags;
 437         else if (S_ISREG(mode))
 438                 return flags & EXT4_REG_FLMASK;
 439         else
 440                 return flags & EXT4_OTHER_FLMASK;
 441 }
 442
 443 /*
 444  * Inode flags used for atomic set/get
 445  */
 446 enum {
 447         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 448         EXT4_INODE_UNRM         = 1,    /* Undelete */
 449         EXT4_INODE_COMPR        = 2,    /* Compress file */
 450         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 451         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 452         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 453         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 454         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 455 /* Reserved for compression usage... */
 456         EXT4_INODE_DIRTY        = 8,
 457         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 458         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 459         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 460 /* End compression flags --- maybe not all used */
 461         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 462         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 463         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 464         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 465         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 466         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 467         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 468         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 469         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 470         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 471         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 472         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 473         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 474 };
 475
 476 /*
 477  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 478  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 479  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 480  * any extra space in the compiled kernel image, otherwise, the build will fail.
 481  * It's important that these values are the same, since we are using
 482  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 483  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 484  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 485  * defined in e2fsprogs.
 486  *
 487  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 488  */
 489 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 490 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 491
 492 static inline void ext4_check_flag_values(void)
 493 {
 494         CHECK_FLAG_VALUE(SECRM);
 495         CHECK_FLAG_VALUE(UNRM);
 496         CHECK_FLAG_VALUE(COMPR);
 497         CHECK_FLAG_VALUE(SYNC);
 498         CHECK_FLAG_VALUE(IMMUTABLE);
 499         CHECK_FLAG_VALUE(APPEND);
 500         CHECK_FLAG_VALUE(NODUMP);
 501         CHECK_FLAG_VALUE(NOATIME);
 502         CHECK_FLAG_VALUE(DIRTY);
 503         CHECK_FLAG_VALUE(COMPRBLK);
 504         CHECK_FLAG_VALUE(NOCOMPR);
 505         CHECK_FLAG_VALUE(ENCRYPT);
 506         CHECK_FLAG_VALUE(INDEX);
 507         CHECK_FLAG_VALUE(IMAGIC);
 508         CHECK_FLAG_VALUE(JOURNAL_DATA);
 509         CHECK_FLAG_VALUE(NOTAIL);
 510         CHECK_FLAG_VALUE(DIRSYNC);
 511         CHECK_FLAG_VALUE(TOPDIR);
 512         CHECK_FLAG_VALUE(HUGE_FILE);
 513         CHECK_FLAG_VALUE(EXTENTS);
 514         CHECK_FLAG_VALUE(EA_INODE);
 515         CHECK_FLAG_VALUE(EOFBLOCKS);
 516         CHECK_FLAG_VALUE(INLINE_DATA);
 517         CHECK_FLAG_VALUE(PROJINHERIT);
 518         CHECK_FLAG_VALUE(RESERVED);
 519 }
 520
 521 /* Used to pass group descriptor data when online resize is done */
 522 struct ext4_new_group_input {
 523         __u32 group;            /* Group number for this data */
 524         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 525         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 526         __u64 inode_table;      /* Absolute block number of inode table start */
 527         __u32 blocks_count;     /* Total number of blocks in this group */
 528         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 529         __u16 unused;
 530 };
 531
 532 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 533 struct compat_ext4_new_group_input {
 534         u32 group;
 535         compat_u64 block_bitmap;
 536         compat_u64 inode_bitmap;
 537         compat_u64 inode_table;
 538         u32 blocks_count;
 539         u16 reserved_blocks;
 540         u16 unused;
 541 };
 542 #endif
 543
 544 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 545 struct ext4_new_group_data {
 546         __u32 group;
 547         __u64 block_bitmap;
 548         __u64 inode_bitmap;
 549         __u64 inode_table;
 550         __u32 blocks_count;
 551         __u16 reserved_blocks;
 552         __u16 mdata_blocks;
 553         __u32 free_clusters_count;
 554 };
 555
 556 /* Indexes used to index group tables in ext4_new_group_data */
 557 enum {
 558         BLOCK_BITMAP = 0,       /* block bitmap */
 559         INODE_BITMAP,           /* inode bitmap */
 560         INODE_TABLE,            /* inode tables */
 561         GROUP_TABLE_COUNT,
 562 };
 563
 564 /*
 565  * Flags used by ext4_map_blocks()
 566  */
 567         /* Allocate any needed blocks and/or convert an unwritten
 568            extent to be an initialized ext4 */
 569 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 570         /* Request the creation of an unwritten extent */
 571 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 572 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 573                                                  EXT4_GET_BLOCKS_CREATE)
 574         /* Caller is from the delayed allocation writeout path
 575          * finally doing the actual allocation of delayed blocks */
 576 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 577         /* caller is from the direct IO path, request to creation of an
 578         unwritten extents if not allocated, split the unwritten
 579         extent if blocks has been preallocated already*/
 580 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 581 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 582 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 583                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 584         /* Convert extent to initialized after IO complete */
 585 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 586                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 587         /* Eventual metadata allocation (due to growing extent tree)
 588          * should not fail, so try to use reserved blocks for that.*/
 589 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 590         /* Don't normalize allocation size (used for fallocate) */
 591 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 592         /* Request will not result in inode size update (user for fallocate) */
 593 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 594         /* Convert written extents to unwritten */
 595 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 596         /* Write zeros to newly created written extents */
 597 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 598 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 599                                         EXT4_GET_BLOCKS_ZERO)
 600         /* Caller will submit data before dropping transaction handle. This
 601          * allows jbd2 to avoid submitting data before commit. */
 602 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 603
 604 /*
 605  * The bit position of these flags must not overlap with any of the
 606  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 607  * read_extent_tree_block(), ext4_split_extent_at(),
 608  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 609  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 610  * caching the extents when reading from the extent tree while a
 611  * truncate or punch hole operation is in progress.
 612  */
 613 #define EXT4_EX_NOCACHE                         0x40000000
 614 #define EXT4_EX_FORCE_CACHE                     0x20000000
 615
 616 /*
 617  * Flags used by ext4_free_blocks
 618  */
 619 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 620 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 621 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 622 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 623 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 624 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 625 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 626
 627 /*
 628  * ioctl commands
 629  */
 630 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 631 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 632 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 633 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 634 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 635 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 636 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 637 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 638 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 639 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 640 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 641  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 642  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 643 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 644 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 645 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 646 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 647 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 648 #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
 649 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
 650 #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
 651
 652 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 653 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 654
 655 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 656
 657 /*
 658  * Flags for going down operation
 659  */
 660 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 661 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 662 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 663
 664
 665 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 666 /*
 667  * ioctl commands in 32 bit emulation
 668  */
 669 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 670 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 671 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 672 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 673 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 674 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 675 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 676 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 677 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 678 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 679 #endif
 680
 681 /* Max physical block we can address w/o extents */
 682 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 683
 684 /* Max logical block we can support */
 685 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
 686
 687 /*
 688  * Structure of an inode on the disk
 689  */
 690 struct ext4_inode {
 691         __le16  i_mode;         /* File mode */
 692         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 693         __le32  i_size_lo;      /* Size in bytes */
 694         __le32  i_atime;        /* Access time */
 695         __le32  i_ctime;        /* Inode Change time */
 696         __le32  i_mtime;        /* Modification time */
 697         __le32  i_dtime;        /* Deletion Time */
 698         __le16  i_gid;          /* Low 16 bits of Group Id */
 699         __le16  i_links_count;  /* Links count */
 700         __le32  i_blocks_lo;    /* Blocks count */
 701         __le32  i_flags;        /* File flags */
 702         union {
 703                 struct {
 704                         __le32  l_i_version;
 705                 } linux1;
 706                 struct {
 707                         __u32  h_i_translator;
 708                 } hurd1;
 709                 struct {
 710                         __u32  m_i_reserved1;
 711                 } masix1;
 712         } osd1;                         /* OS dependent 1 */
 713         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 714         __le32  i_generation;   /* File version (for NFS) */
 715         __le32  i_file_acl_lo;  /* File ACL */
 716         __le32  i_size_high;
 717         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 718         union {
 719                 struct {
 720                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 721                         __le16  l_i_file_acl_high;
 722                         __le16  l_i_uid_high;   /* these 2 fields */
 723                         __le16  l_i_gid_high;   /* were reserved2[0] */
 724                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 725                         __le16  l_i_reserved;
 726                 } linux2;
 727                 struct {
 728                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 729                         __u16   h_i_mode_high;
 730                         __u16   h_i_uid_high;
 731                         __u16   h_i_gid_high;
 732                         __u32   h_i_author;
 733                 } hurd2;
 734                 struct {
 735                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 736                         __le16  m_i_file_acl_high;
 737                         __u32   m_i_reserved2[2];
 738                 } masix2;
 739         } osd2;                         /* OS dependent 2 */
 740         __le16  i_extra_isize;
 741         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 742         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 743         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 744         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 745         __le32  i_crtime;       /* File Creation time */
 746         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 747         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 748         __le32  i_projid;       /* Project ID */
 749 };
 750
 751 struct move_extent {
 752         __u32 reserved;         /* should be zero */
 753         __u32 donor_fd;         /* donor file descriptor */
 754         __u64 orig_start;       /* logical start offset in block for orig */
 755         __u64 donor_start;      /* logical start offset in block for donor */
 756         __u64 len;              /* block length to be moved */
 757         __u64 moved_len;        /* moved block length */
 758 };
 759
 760 #define EXT4_EPOCH_BITS 2
 761 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 762 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 763
 764 /*
 765  * Extended fields will fit into an inode if the filesystem was formatted
 766  * with large inodes (-I 256 or larger) and there are not currently any EAs
 767  * consuming all of the available space. For new inodes we always reserve
 768  * enough space for the kernel's known extended fields, but for inodes
 769  * created with an old kernel this might not have been the case. None of
 770  * the extended inode fields is critical for correct filesystem operation.
 771  * This macro checks if a certain field fits in the inode. Note that
 772  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 773  */
 774 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 775         ((offsetof(typeof(*ext4_inode), field) +        \
 776           sizeof((ext4_inode)->field))                  \
 777         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 778             (einode)->i_extra_isize))                   \
 779
 780 /*
 781  * We use an encoding that preserves the times for extra epoch "00":
 782  *
 783  * extra  msb of                         adjust for signed
 784  * epoch  32-bit                         32-bit tv_sec to
 785  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 786  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 787  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 788  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 789  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 790  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 791  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 792  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 793  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 794  *
 795  * Note that previous versions of the kernel on 64-bit systems would
 796  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 797  * 1970.  e2fsck will correct this, assuming that it is run on the
 798  * affected filesystem before 2242.
 799  */
 800
 801 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 802 {
 803         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 804         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 805 }
 806
 807 static inline void ext4_decode_extra_time(struct timespec64 *time,
 808                                           __le32 extra)
 809 {
 810         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
 811
 812 #if 1
 813                 /* Handle legacy encoding of pre-1970 dates with epoch
 814                  * bits 1,1. (This backwards compatibility may be removed
 815                  * at the discretion of the ext4 developers.)
 816                  */
 817                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 818                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 819                         extra_bits = 0;
 820                 time->tv_sec += extra_bits << 32;
 821 #else
 822                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 823 #endif
 824         }
 825         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 826 }
 827
 828 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 829 do {                                                                            \
 830         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);                \
 831         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 832                 (raw_inode)->xtime ## _extra =                                  \
 833                                 ext4_encode_extra_time(&(inode)->xtime);        \
 834                 }                                                               \
 835 } while (0)
 836
 837 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 838 do {                                                                           \
 839         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 840                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 841         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 842                 (raw_inode)->xtime ## _extra =                                 \
 843                                 ext4_encode_extra_time(&(einode)->xtime);      \
 844 } while (0)
 845
 846 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 847 do {                                                                            \
 848         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 849         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 850                 ext4_decode_extra_time(&(inode)->xtime,                         \
 851                                        raw_inode->xtime ## _extra);             \
 852                 }                                                               \
 853         else                                                                    \
 854                 (inode)->xtime.tv_nsec = 0;                                     \
 855 } while (0)
 856
 857
 858 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 859 do {                                                                           \
 860         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 861                 (einode)->xtime.tv_sec =                                       \
 862                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 863         else                                                                   \
 864                 (einode)->xtime.tv_sec = 0;                                    \
 865         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 866                 ext4_decode_extra_time(&(einode)->xtime,                       \
 867                                        raw_inode->xtime ## _extra);            \
 868         else                                                                   \
 869                 (einode)->xtime.tv_nsec = 0;                                   \
 870 } while (0)
 871
 872 #define i_disk_version osd1.linux1.l_i_version
 873
 874 #if defined(__KERNEL__) || defined(__linux__)
 875 #define i_reserved1     osd1.linux1.l_i_reserved1
 876 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 877 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 878 #define i_uid_low       i_uid
 879 #define i_gid_low       i_gid
 880 #define i_uid_high      osd2.linux2.l_i_uid_high
 881 #define i_gid_high      osd2.linux2.l_i_gid_high
 882 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 883
 884 #elif defined(__GNU__)
 885
 886 #define i_translator    osd1.hurd1.h_i_translator
 887 #define i_uid_high      osd2.hurd2.h_i_uid_high
 888 #define i_gid_high      osd2.hurd2.h_i_gid_high
 889 #define i_author        osd2.hurd2.h_i_author
 890
 891 #elif defined(__masix__)
 892
 893 #define i_reserved1     osd1.masix1.m_i_reserved1
 894 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 895 #define i_reserved2     osd2.masix2.m_i_reserved2
 896
 897 #endif /* defined(__KERNEL__) || defined(__linux__) */
 898
 899 #include "extents_status.h"
 900
 901 /*
 902  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 903  *
 904  * These are needed to avoid lockdep false positives when we need to
 905  * allocate blocks to the quota inode during ext4_map_blocks(), while
 906  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 907  * do quota tracking for the quota inode, this avoids deadlock (as
 908  * well as infinite recursion, since it isn't turtles all the way
 909  * down...)
 910  *
 911  *  I_DATA_SEM_NORMAL - Used for most inodes
 912  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 913  *                        where the second inode has larger inode number
 914  *                        than the first
 915  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 916  */
 917 enum {
 918         I_DATA_SEM_NORMAL = 0,
 919         I_DATA_SEM_OTHER,
 920         I_DATA_SEM_QUOTA,
 921 };
 922
 923
 924 /*
 925  * fourth extended file system inode data in memory
 926  */
 927 struct ext4_inode_info {
 928         __le32  i_data[15];     /* unconverted */
 929         __u32   i_dtime;
 930         ext4_fsblk_t    i_file_acl;
 931
 932         /*
 933          * i_block_group is the number of the block group which contains
 934          * this file's inode.  Constant across the lifetime of the inode,
 935          * it is used for making block allocation decisions - we try to
 936          * place a file's data blocks near its inode block, and new inodes
 937          * near to their parent directory's inode.
 938          */
 939         ext4_group_t    i_block_group;
 940         ext4_lblk_t     i_dir_start_lookup;
 941 #if (BITS_PER_LONG < 64)
 942         unsigned long   i_state_flags;          /* Dynamic state flags */
 943 #endif
 944         unsigned long   i_flags;
 945
 946         /*
 947          * Extended attributes can be read independently of the main file
 948          * data. Taking i_mutex even when reading would cause contention
 949          * between readers of EAs and writers of regular file data, so
 950          * instead we synchronize on xattr_sem when reading or changing
 951          * EAs.
 952          */
 953         struct rw_semaphore xattr_sem;
 954
 955         struct list_head i_orphan;      /* unlinked but open inodes */
 956
 957         /*
 958          * i_disksize keeps track of what the inode size is ON DISK, not
 959          * in memory.  During truncate, i_size is set to the new size by
 960          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 961          * set i_disksize to 0 until the truncate is actually under way.
 962          *
 963          * The intent is that i_disksize always represents the blocks which
 964          * are used by this file.  This allows recovery to restart truncate
 965          * on orphans if we crash during truncate.  We actually write i_disksize
 966          * into the on-disk inode when writing inodes out, instead of i_size.
 967          *
 968          * The only time when i_disksize and i_size may be different is when
 969          * a truncate is in progress.  The only things which change i_disksize
 970          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 971          */
 972         loff_t  i_disksize;
 973
 974         /*
 975          * i_data_sem is for serialising ext4_truncate() against
 976          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 977          * data tree are chopped off during truncate. We can't do that in
 978          * ext4 because whenever we perform intermediate commits during
 979          * truncate, the inode and all the metadata blocks *must* be in a
 980          * consistent state which allows truncation of the orphans to restart
 981          * during recovery.  Hence we must fix the get_block-vs-truncate race
 982          * by other means, so we have i_data_sem.
 983          */
 984         struct rw_semaphore i_data_sem;
 985         /*
 986          * i_mmap_sem is for serializing page faults with truncate / punch hole
 987          * operations. We have to make sure that new page cannot be faulted in
 988          * a section of the inode that is being punched. We cannot easily use
 989          * i_data_sem for this since we need protection for the whole punch
 990          * operation and i_data_sem ranks below transaction start so we have
 991          * to occasionally drop it.
 992          */
 993         struct rw_semaphore i_mmap_sem;
 994         struct inode vfs_inode;
 995         struct jbd2_inode *jinode;
 996
 997         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
 998
 999         /*
1000          * File creation time. Its function is same as that of
1001          * struct timespec64 i_{a,c,m}time in the generic inode.
1002          */
1003         struct timespec64 i_crtime;
1004
1005         /* mballoc */
1006         struct list_head i_prealloc_list;
1007         spinlock_t i_prealloc_lock;
1008
1009         /* extents status tree */
1010         struct ext4_es_tree i_es_tree;
1011         rwlock_t i_es_lock;
1012         struct list_head i_es_list;
1013         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1014         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1015         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1016                                            extents to shrink. Protected by
1017                                            i_es_lock  */
1018
1019         /* ialloc */
1020         ext4_group_t    i_last_alloc_group;
1021
1022         /* allocation reservation info for delalloc */
1023         /* In case of bigalloc, this refer to clusters rather than blocks */
1024         unsigned int i_reserved_data_blocks;
1025         ext4_lblk_t i_da_metadata_calc_last_lblock;
1026         int i_da_metadata_calc_len;
1027
1028         /* pending cluster reservations for bigalloc file systems */
1029         struct ext4_pending_tree i_pending_tree;
1030
1031         /* on-disk additional length */
1032         __u16 i_extra_isize;
1033
1034         /* Indicate the inline data space. */
1035         u16 i_inline_off;
1036         u16 i_inline_size;
1037
1038 #ifdef CONFIG_QUOTA
1039         /* quota space reservation, managed internally by quota code */
1040         qsize_t i_reserved_quota;
1041 #endif
1042
1043         /* Lock protecting lists below */
1044         spinlock_t i_completed_io_lock;
1045         /*
1046          * Completed IOs that need unwritten extents handling and have
1047          * transaction reserved
1048          */
1049         struct list_head i_rsv_conversion_list;
1050         struct work_struct i_rsv_conversion_work;
1051         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1052
1053         spinlock_t i_block_reservation_lock;
1054
1055         /*
1056          * Transactions that contain inode's metadata needed to complete
1057          * fsync and fdatasync, respectively.
1058          */
1059         tid_t i_sync_tid;
1060         tid_t i_datasync_tid;
1061
1062 #ifdef CONFIG_QUOTA
1063         struct dquot *i_dquot[MAXQUOTAS];
1064 #endif
1065
1066         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1067         __u32 i_csum_seed;
1068
1069         kprojid_t i_projid;
1070 };
1071
1072 /*
1073  * File system states
1074  */
1075 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1076 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1077 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1078
1079 /*
1080  * Misc. filesystem flags
1081  */
1082 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1083 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1084 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1085
1086 /*
1087  * Mount flags set via mount options or defaults
1088  */
1089 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1090 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1091 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1092 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1093 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1094 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1095 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1096 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1097 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1098 #ifdef CONFIG_FS_DAX
1099 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1100 #else
1101 #define EXT4_MOUNT_DAX                  0
1102 #endif
1103 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1104 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1105 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1106 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1107 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1108 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1109 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1110 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1111 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1112 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1113 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1114 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1115                                                  * enable enforcement for hidden
1116                                                  * quota files */
1117 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1118                                                   * enforcement for hidden quota
1119                                                   * files */
1120 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1121                                                   * enforcement */
1122 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1123 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1124 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1125 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1126 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1127 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1128 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1129 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1130 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1131
1132 /*
1133  * Mount flags set either automatically (could not be set by mount option)
1134  * based on per file system feature or property or in special cases such as
1135  * distinguishing between explicit mount option definition and default.
1136  */
1137 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1138                                                       specified delalloc */
1139 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1140                                                       size of blocksize * 8
1141                                                       blocks */
1142 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1143                                                       file systems */
1144
1145 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1146                                                 specified journal checksum */
1147
1148 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1149                                                 ~EXT4_MOUNT_##opt
1150 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1151                                                 EXT4_MOUNT_##opt
1152 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1153                                          EXT4_MOUNT_##opt)
1154
1155 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1156                                                 ~EXT4_MOUNT2_##opt
1157 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1158                                                 EXT4_MOUNT2_##opt
1159 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1160                                          EXT4_MOUNT2_##opt)
1161
1162 #define ext4_test_and_set_bit           __test_and_set_bit_le
1163 #define ext4_set_bit                    __set_bit_le
1164 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1165 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1166 #define ext4_clear_bit                  __clear_bit_le
1167 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1168 #define ext4_test_bit                   test_bit_le
1169 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1170 #define ext4_find_next_bit              find_next_bit_le
1171
1172 extern void ext4_set_bits(void *bm, int cur, int len);
1173
1174 /*
1175  * Maximal mount counts between two filesystem checks
1176  */
1177 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1178 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1179
1180 /*
1181  * Behaviour when detecting errors
1182  */
1183 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1184 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1185 #define EXT4_ERRORS_PANIC               3       /* Panic */
1186 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1187
1188 /* Metadata checksum algorithm codes */
1189 #define EXT4_CRC32C_CHKSUM              1
1190
1191 /*
1192  * Structure of the super block
1193  */
1194 struct ext4_super_block {
1195 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1196         __le32  s_blocks_count_lo;      /* Blocks count */
1197         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1198         __le32  s_free_blocks_count_lo; /* Free blocks count */
1199 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1200         __le32  s_first_data_block;     /* First Data Block */
1201         __le32  s_log_block_size;       /* Block size */
1202         __le32  s_log_cluster_size;     /* Allocation cluster size */
1203 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1204         __le32  s_clusters_per_group;   /* # Clusters per group */
1205         __le32  s_inodes_per_group;     /* # Inodes per group */
1206         __le32  s_mtime;                /* Mount time */
1207 /*30*/  __le32  s_wtime;                /* Write time */
1208         __le16  s_mnt_count;            /* Mount count */
1209         __le16  s_max_mnt_count;        /* Maximal mount count */
1210         __le16  s_magic;                /* Magic signature */
1211         __le16  s_state;                /* File system state */
1212         __le16  s_errors;               /* Behaviour when detecting errors */
1213         __le16  s_minor_rev_level;      /* minor revision level */
1214 /*40*/  __le32  s_lastcheck;            /* time of last check */
1215         __le32  s_checkinterval;        /* max. time between checks */
1216         __le32  s_creator_os;           /* OS */
1217         __le32  s_rev_level;            /* Revision level */
1218 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1219         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1220         /*
1221          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1222          *
1223          * Note: the difference between the compatible feature set and
1224          * the incompatible feature set is that if there is a bit set
1225          * in the incompatible feature set that the kernel doesn't
1226          * know about, it should refuse to mount the filesystem.
1227          *
1228          * e2fsck's requirements are more strict; if it doesn't know
1229          * about a feature in either the compatible or incompatible
1230          * feature set, it must abort and not try to meddle with
1231          * things it doesn't understand...
1232          */
1233         __le32  s_first_ino;            /* First non-reserved inode */
1234         __le16  s_inode_size;           /* size of inode structure */
1235         __le16  s_block_group_nr;       /* block group # of this superblock */
1236         __le32  s_feature_compat;       /* compatible feature set */
1237 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1238         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1239 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1240 /*78*/  char    s_volume_name[16];      /* volume name */
1241 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1242 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1243         /*
1244          * Performance hints.  Directory preallocation should only
1245          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1246          */
1247         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1248         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1249         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1250         /*
1251          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1252          */
1253 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1254 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1255         __le32  s_journal_dev;          /* device number of journal file */
1256         __le32  s_last_orphan;          /* start of list of inodes to delete */
1257         __le32  s_hash_seed[4];         /* HTREE hash seed */
1258         __u8    s_def_hash_version;     /* Default hash version to use */
1259         __u8    s_jnl_backup_type;
1260         __le16  s_desc_size;            /* size of group descriptor */
1261 /*100*/ __le32  s_default_mount_opts;
1262         __le32  s_first_meta_bg;        /* First metablock block group */
1263         __le32  s_mkfs_time;            /* When the filesystem was created */
1264         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1265         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1266 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1267         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1268         __le32  s_free_blocks_count_hi; /* Free blocks count */
1269         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1270         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1271         __le32  s_flags;                /* Miscellaneous flags */
1272         __le16  s_raid_stride;          /* RAID stride */
1273         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1274         __le64  s_mmp_block;            /* Block for multi-mount protection */
1275         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1276         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1277         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1278         __u8    s_encryption_level;     /* versioning level for encryption */
1279         __u8    s_reserved_pad;         /* Padding to next 32bits */
1280         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1281         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1282         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1283         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1284                                               snapshot's future use */
1285         __le32  s_snapshot_list;        /* inode number of the head of the
1286                                            on-disk snapshot list */
1287 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1288         __le32  s_error_count;          /* number of fs errors */
1289         __le32  s_first_error_time;     /* first time an error happened */
1290         __le32  s_first_error_ino;      /* inode involved in first error */
1291         __le64  s_first_error_block;    /* block involved of first error */
1292         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1293         __le32  s_first_error_line;     /* line number where error happened */
1294         __le32  s_last_error_time;      /* most recent time of an error */
1295         __le32  s_last_error_ino;       /* inode involved in last error */
1296         __le32  s_last_error_line;      /* line number where error happened */
1297         __le64  s_last_error_block;     /* block involved of last error */
1298         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1299 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1300         __u8    s_mount_opts[64];
1301         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1302         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1303         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1304         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1305         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1306         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1307         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1308         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1309         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1310         __u8    s_wtime_hi;
1311         __u8    s_mtime_hi;
1312         __u8    s_mkfs_time_hi;
1313         __u8    s_lastcheck_hi;
1314         __u8    s_first_error_time_hi;
1315         __u8    s_last_error_time_hi;
1316         __u8    s_pad[2];
1317         __le16  s_encoding;             /* Filename charset encoding */
1318         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1319         __le32  s_reserved[95];         /* Padding to the end of the block */
1320         __le32  s_checksum;             /* crc32c(superblock) */
1321 };
1322
1323 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1324
1325 #ifdef __KERNEL__
1326
1327 /*
1328  * run-time mount flags
1329  */
1330 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1331 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1332 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1333
1334 #ifdef CONFIG_FS_ENCRYPTION
1335 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1336                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1337 #else
1338 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1339 #endif
1340
1341 /* Number of quota types we support */
1342 #define EXT4_MAXQUOTAS 3
1343
1344 #define EXT4_ENC_UTF8_12_1      1
1345
1346 /*
1347  * Flags for ext4_sb_info.s_encoding_flags.
1348  */
1349 #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1350
1351 #define ext4_has_strict_mode(sbi) \
1352         (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1353
1354 /*
1355  * fourth extended-fs super-block data in memory
1356  */
1357 struct ext4_sb_info {
1358         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1359         unsigned long s_inodes_per_block;/* Number of inodes per block */
1360         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1361         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1362         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1363         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1364         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1365         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1366         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1367         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1368         unsigned long s_overhead;  /* # of fs overhead clusters */
1369         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1370         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1371         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1372         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1373         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1374         struct buffer_head **s_group_desc;
1375         unsigned int s_mount_opt;
1376         unsigned int s_mount_opt2;
1377         unsigned int s_mount_flags;
1378         unsigned int s_def_mount_opt;
1379         ext4_fsblk_t s_sb_block;
1380         atomic64_t s_resv_clusters;
1381         kuid_t s_resuid;
1382         kgid_t s_resgid;
1383         unsigned short s_mount_state;
1384         unsigned short s_pad;
1385         int s_addr_per_block_bits;
1386         int s_desc_per_block_bits;
1387         int s_inode_size;
1388         int s_first_ino;
1389         unsigned int s_inode_readahead_blks;
1390         unsigned int s_inode_goal;
1391         u32 s_hash_seed[4];
1392         int s_def_hash_version;
1393         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1394         struct percpu_counter s_freeclusters_counter;
1395         struct percpu_counter s_freeinodes_counter;
1396         struct percpu_counter s_dirs_counter;
1397         struct percpu_counter s_dirtyclusters_counter;
1398         struct blockgroup_lock *s_blockgroup_lock;
1399         struct proc_dir_entry *s_proc;
1400         struct kobject s_kobj;
1401         struct completion s_kobj_unregister;
1402         struct super_block *s_sb;
1403 #ifdef CONFIG_UNICODE
1404         struct unicode_map *s_encoding;
1405         __u16 s_encoding_flags;
1406 #endif
1407
1408         /* Journaling */
1409         struct journal_s *s_journal;
1410         struct list_head s_orphan;
1411         struct mutex s_orphan_lock;
1412         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1413         unsigned long s_commit_interval;
1414         u32 s_max_batch_time;
1415         u32 s_min_batch_time;
1416         struct block_device *journal_bdev;
1417 #ifdef CONFIG_QUOTA
1418         /* Names of quota files with journalled quota */
1419         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1420         int s_jquota_fmt;                       /* Format of quota to use */
1421 #endif
1422         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1423         struct rb_root system_blks;
1424
1425 #ifdef EXTENTS_STATS
1426         /* ext4 extents stats */
1427         unsigned long s_ext_min;
1428         unsigned long s_ext_max;
1429         unsigned long s_depth_max;
1430         spinlock_t s_ext_stats_lock;
1431         unsigned long s_ext_blocks;
1432         unsigned long s_ext_extents;
1433 #endif
1434
1435         /* for buddy allocator */
1436         struct ext4_group_info ***s_group_info;
1437         struct inode *s_buddy_cache;
1438         spinlock_t s_md_lock;
1439         unsigned short *s_mb_offsets;
1440         unsigned int *s_mb_maxs;
1441         unsigned int s_group_info_size;
1442         unsigned int s_mb_free_pending;
1443         struct list_head s_freed_data_list;     /* List of blocks to be freed
1444                                                    after commit completed */
1445
1446         /* tunables */
1447         unsigned long s_stripe;
1448         unsigned int s_mb_stream_request;
1449         unsigned int s_mb_max_to_scan;
1450         unsigned int s_mb_min_to_scan;
1451         unsigned int s_mb_stats;
1452         unsigned int s_mb_order2_reqs;
1453         unsigned int s_mb_group_prealloc;
1454         unsigned int s_max_dir_size_kb;
1455         /* where last allocation was done - for stream allocation */
1456         unsigned long s_mb_last_group;
1457         unsigned long s_mb_last_start;
1458
1459         /* stats for buddy allocator */
1460         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1461         atomic_t s_bal_success; /* we found long enough chunks */
1462         atomic_t s_bal_allocated;       /* in blocks */
1463         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1464         atomic_t s_bal_goals;   /* goal hits */
1465         atomic_t s_bal_breaks;  /* too long searches */
1466         atomic_t s_bal_2orders; /* 2^order hits */
1467         spinlock_t s_bal_lock;
1468         unsigned long s_mb_buddies_generated;
1469         unsigned long long s_mb_generation_time;
1470         atomic_t s_mb_lost_chunks;
1471         atomic_t s_mb_preallocated;
1472         atomic_t s_mb_discarded;
1473         atomic_t s_lock_busy;
1474
1475         /* locality groups */
1476         struct ext4_locality_group __percpu *s_locality_groups;
1477
1478         /* for write statistics */
1479         unsigned long s_sectors_written_start;
1480         u64 s_kbytes_written;
1481
1482         /* the size of zero-out chunk */
1483         unsigned int s_extent_max_zeroout_kb;
1484
1485         unsigned int s_log_groups_per_flex;
1486         struct flex_groups *s_flex_groups;
1487         ext4_group_t s_flex_groups_allocated;
1488
1489         /* workqueue for reserved extent conversions (buffered io) */
1490         struct workqueue_struct *rsv_conversion_wq;
1491
1492         /* timer for periodic error stats printing */
1493         struct timer_list s_err_report;
1494
1495         /* Lazy inode table initialization info */
1496         struct ext4_li_request *s_li_request;
1497         /* Wait multiplier for lazy initialization thread */
1498         unsigned int s_li_wait_mult;
1499
1500         /* Kernel thread for multiple mount protection */
1501         struct task_struct *s_mmp_tsk;
1502
1503         /* record the last minlen when FITRIM is called. */
1504         atomic_t s_last_trim_minblks;
1505
1506         /* Reference to checksum algorithm driver via cryptoapi */
1507         struct crypto_shash *s_chksum_driver;
1508
1509         /* Precomputed FS UUID checksum for seeding other checksums */
1510         __u32 s_csum_seed;
1511
1512         /* Reclaim extents from extent status tree */
1513         struct shrinker s_es_shrinker;
1514         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1515         long s_es_nr_inode;
1516         struct ext4_es_stats s_es_stats;
1517         struct mb_cache *s_ea_block_cache;
1518         struct mb_cache *s_ea_inode_cache;
1519         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1520
1521         /* Ratelimit ext4 messages. */
1522         struct ratelimit_state s_err_ratelimit_state;
1523         struct ratelimit_state s_warning_ratelimit_state;
1524         struct ratelimit_state s_msg_ratelimit_state;
1525
1526         /* Barrier between changing inodes' journal flags and writepages ops. */
1527         struct percpu_rw_semaphore s_journal_flag_rwsem;
1528         struct dax_device *s_daxdev;
1529 };
1530
1531 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1532 {
1533         return sb->s_fs_info;
1534 }
1535 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1536 {
1537         return container_of(inode, struct ext4_inode_info, vfs_inode);
1538 }
1539
1540 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1541 {
1542         return ino == EXT4_ROOT_INO ||
1543                 (ino >= EXT4_FIRST_INO(sb) &&
1544                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1545 }
1546
1547 /*
1548  * Inode dynamic state flags
1549  */
1550 enum {
1551         EXT4_STATE_JDATA,               /* journaled data exists */
1552         EXT4_STATE_NEW,                 /* inode is newly created */
1553         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1554         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1555         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1556         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1557         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1558         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1559         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1560         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1561         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1562 };
1563
1564 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1565 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1566 {                                                                       \
1567         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1568 }                                                                       \
1569 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1570 {                                                                       \
1571         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1572 }                                                                       \
1573 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1574 {                                                                       \
1575         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1576 }
1577
1578 /* Add these declarations here only so that these functions can be
1579  * found by name.  Otherwise, they are very hard to locate. */
1580 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1581 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1582 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1583 EXT4_INODE_BIT_FNS(flag, flags, 0)
1584
1585 /* Add these declarations here only so that these functions can be
1586  * found by name.  Otherwise, they are very hard to locate. */
1587 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1588 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1589 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1590 #if (BITS_PER_LONG < 64)
1591 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1592
1593 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1594 {
1595         (ei)->i_state_flags = 0;
1596 }
1597 #else
1598 EXT4_INODE_BIT_FNS(state, flags, 32)
1599
1600 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1601 {
1602         /* We depend on the fact that callers will set i_flags */
1603 }
1604 #endif
1605 #else
1606 /* Assume that user mode programs are passing in an ext4fs superblock, not
1607  * a kernel struct super_block.  This will allow us to call the feature-test
1608  * macros from user land. */
1609 #define EXT4_SB(sb)     (sb)
1610 #endif
1611
1612 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1613
1614 /*
1615  * Codes for operating systems
1616  */
1617 #define EXT4_OS_LINUX           0
1618 #define EXT4_OS_HURD            1
1619 #define EXT4_OS_MASIX           2
1620 #define EXT4_OS_FREEBSD         3
1621 #define EXT4_OS_LITES           4
1622
1623 /*
1624  * Revision levels
1625  */
1626 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1627 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1628
1629 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1630 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1631
1632 #define EXT4_GOOD_OLD_INODE_SIZE 128
1633
1634 /*
1635  * Feature set definitions
1636  */
1637
1638 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1639 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1640 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1641 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1642 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1643 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1644 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1645
1646 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1647 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1648 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1649 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1650 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1651 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1652 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1653 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1654 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1655 /*
1656  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1657  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1658  * all other data structures' checksums.  However, the METADATA_CSUM and
1659  * GDT_CSUM bits are mutually exclusive.
1660  */
1661 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1662 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1663 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1664
1665 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1666 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1667 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1668 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1669 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1670 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1671 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1672 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1673 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1674 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1675 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1676 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1677 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1678 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1679 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1680 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
1681
1682 extern void ext4_update_dynamic_rev(struct super_block *sb);
1683
1684 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1685 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1686 { \
1687         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1688                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1689 } \
1690 static inline void ext4_set_feature_##name(struct super_block *sb) \
1691 { \
1692         ext4_update_dynamic_rev(sb); \
1693         EXT4_SB(sb)->s_es->s_feature_compat |= \
1694                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1695 } \
1696 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1697 { \
1698         EXT4_SB(sb)->s_es->s_feature_compat &= \
1699                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1700 }
1701
1702 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1703 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1704 { \
1705         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1706                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1707 } \
1708 static inline void ext4_set_feature_##name(struct super_block *sb) \
1709 { \
1710         ext4_update_dynamic_rev(sb); \
1711         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1712                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1713 } \
1714 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1715 { \
1716         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1717                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1718 }
1719
1720 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1721 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1722 { \
1723         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1724                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1725 } \
1726 static inline void ext4_set_feature_##name(struct super_block *sb) \
1727 { \
1728         ext4_update_dynamic_rev(sb); \
1729         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1730                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1731 } \
1732 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1733 { \
1734         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1735                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1736 }
1737
1738 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1739 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1740 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1741 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1742 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1743 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1744 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1745
1746 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1747 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1748 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1749 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1750 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1751 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1752 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1753 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1754 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1755 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1756 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1757 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1758
1759 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1760 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1761 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1762 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1763 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1764 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1765 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1766 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1767 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1768 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1769 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1770 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1771 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1772 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1773 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1774 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
1775
1776 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1777 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1778                                          EXT4_FEATURE_INCOMPAT_META_BG)
1779 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1780                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1781                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1782
1783 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1784 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1785                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1786                                          EXT4_FEATURE_INCOMPAT_META_BG)
1787 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1788                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1789                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1790
1791 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1792 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1793                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1794                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1795                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1796                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1797                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1798                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
1799                                          EXT4_FEATURE_INCOMPAT_MMP | \
1800                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1801                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1802                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1803                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1804                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
1805 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1806                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1807                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1808                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1809                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1810                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1811                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1812                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1813                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1814                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1815                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1816
1817 #define EXTN_FEATURE_FUNCS(ver) \
1818 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1819 { \
1820         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1821                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1822 } \
1823 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1824 { \
1825         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1826                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1827 } \
1828 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1829 { \
1830         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1831                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1832 }
1833
1834 EXTN_FEATURE_FUNCS(2)
1835 EXTN_FEATURE_FUNCS(3)
1836 EXTN_FEATURE_FUNCS(4)
1837
1838 static inline bool ext4_has_compat_features(struct super_block *sb)
1839 {
1840         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1841 }
1842 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1843 {
1844         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1845 }
1846 static inline bool ext4_has_incompat_features(struct super_block *sb)
1847 {
1848         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1849 }
1850
1851 /*
1852  * Superblock flags
1853  */
1854 #define EXT4_FLAGS_RESIZING     0
1855 #define EXT4_FLAGS_SHUTDOWN     1
1856
1857 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1858 {
1859         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1860 }
1861
1862
1863 /*
1864  * Default values for user and/or group using reserved blocks
1865  */
1866 #define EXT4_DEF_RESUID         0
1867 #define EXT4_DEF_RESGID         0
1868
1869 /*
1870  * Default project ID
1871  */
1872 #define EXT4_DEF_PROJID         0
1873
1874 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1875
1876 /*
1877  * Default mount options
1878  */
1879 #define EXT4_DEFM_DEBUG         0x0001
1880 #define EXT4_DEFM_BSDGROUPS     0x0002
1881 #define EXT4_DEFM_XATTR_USER    0x0004
1882 #define EXT4_DEFM_ACL           0x0008
1883 #define EXT4_DEFM_UID16         0x0010
1884 #define EXT4_DEFM_JMODE         0x0060
1885 #define EXT4_DEFM_JMODE_DATA    0x0020
1886 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1887 #define EXT4_DEFM_JMODE_WBACK   0x0060
1888 #define EXT4_DEFM_NOBARRIER     0x0100
1889 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1890 #define EXT4_DEFM_DISCARD       0x0400
1891 #define EXT4_DEFM_NODELALLOC    0x0800
1892
1893 /*
1894  * Default journal batch times
1895  */
1896 #define EXT4_DEF_MIN_BATCH_TIME 0
1897 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1898
1899 /*
1900  * Minimum number of groups in a flexgroup before we separate out
1901  * directories into the first block group of a flexgroup
1902  */
1903 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1904
1905 /*
1906  * Structure of a directory entry
1907  */
1908 #define EXT4_NAME_LEN 255
1909
1910 struct ext4_dir_entry {
1911         __le32  inode;                  /* Inode number */
1912         __le16  rec_len;                /* Directory entry length */
1913         __le16  name_len;               /* Name length */
1914         char    name[EXT4_NAME_LEN];    /* File name */
1915 };
1916
1917 /*
1918  * The new version of the directory entry.  Since EXT4 structures are
1919  * stored in intel byte order, and the name_len field could never be
1920  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1921  * file_type field.
1922  */
1923 struct ext4_dir_entry_2 {
1924         __le32  inode;                  /* Inode number */
1925         __le16  rec_len;                /* Directory entry length */
1926         __u8    name_len;               /* Name length */
1927         __u8    file_type;
1928         char    name[EXT4_NAME_LEN];    /* File name */
1929 };
1930
1931 /*
1932  * This is a bogus directory entry at the end of each leaf block that
1933  * records checksums.
1934  */
1935 struct ext4_dir_entry_tail {
1936         __le32  det_reserved_zero1;     /* Pretend to be unused */
1937         __le16  det_rec_len;            /* 12 */
1938         __u8    det_reserved_zero2;     /* Zero name length */
1939         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1940         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1941 };
1942
1943 #define EXT4_DIRENT_TAIL(block, blocksize) \
1944         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1945                                         ((blocksize) - \
1946                                          sizeof(struct ext4_dir_entry_tail))))
1947
1948 /*
1949  * Ext4 directory file types.  Only the low 3 bits are used.  The
1950  * other bits are reserved for now.
1951  */
1952 #define EXT4_FT_UNKNOWN         0
1953 #define EXT4_FT_REG_FILE        1
1954 #define EXT4_FT_DIR             2
1955 #define EXT4_FT_CHRDEV          3
1956 #define EXT4_FT_BLKDEV          4
1957 #define EXT4_FT_FIFO            5
1958 #define EXT4_FT_SOCK            6
1959 #define EXT4_FT_SYMLINK         7
1960
1961 #define EXT4_FT_MAX             8
1962
1963 #define EXT4_FT_DIR_CSUM        0xDE
1964
1965 /*
1966  * EXT4_DIR_PAD defines the directory entries boundaries
1967  *
1968  * NOTE: It must be a multiple of 4
1969  */
1970 #define EXT4_DIR_PAD                    4
1971 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1972 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1973                                          ~EXT4_DIR_ROUND)
1974 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1975
1976 /*
1977  * If we ever get support for fs block sizes > page_size, we'll need
1978  * to remove the #if statements in the next two functions...
1979  */
1980 static inline unsigned int
1981 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1982 {
1983         unsigned len = le16_to_cpu(dlen);
1984
1985 #if (PAGE_SIZE >= 65536)
1986         if (len == EXT4_MAX_REC_LEN || len == 0)
1987                 return blocksize;
1988         return (len & 65532) | ((len & 3) << 16);
1989 #else
1990         return len;
1991 #endif
1992 }
1993
1994 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1995 {
1996         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1997                 BUG();
1998 #if (PAGE_SIZE >= 65536)
1999         if (len < 65536)
2000                 return cpu_to_le16(len);
2001         if (len == blocksize) {
2002                 if (blocksize == 65536)
2003                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2004                 else
2005                         return cpu_to_le16(0);
2006         }
2007         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2008 #else
2009         return cpu_to_le16(len);
2010 #endif
2011 }
2012
2013 /*
2014  * Hash Tree Directory indexing
2015  * (c) Daniel Phillips, 2001
2016  */
2017
2018 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2019                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2020 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2021                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2022 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2023
2024 /* Legal values for the dx_root hash_version field: */
2025
2026 #define DX_HASH_LEGACY                  0
2027 #define DX_HASH_HALF_MD4                1
2028 #define DX_HASH_TEA                     2
2029 #define DX_HASH_LEGACY_UNSIGNED         3
2030 #define DX_HASH_HALF_MD4_UNSIGNED       4
2031 #define DX_HASH_TEA_UNSIGNED            5
2032
2033 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2034                               const void *address, unsigned int length)
2035 {
2036         struct {
2037                 struct shash_desc shash;
2038                 char ctx[4];
2039         } desc;
2040
2041         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2042
2043         desc.shash.tfm = sbi->s_chksum_driver;
2044         *(u32 *)desc.ctx = crc;
2045
2046         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2047
2048         return *(u32 *)desc.ctx;
2049 }
2050
2051 #ifdef __KERNEL__
2052
2053 /* hash info structure used by the directory hash */
2054 struct dx_hash_info
2055 {
2056         u32             hash;
2057         u32             minor_hash;
2058         int             hash_version;
2059         u32             *seed;
2060 };
2061
2062
2063 /* 32 and 64 bit signed EOF for dx directories */
2064 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2065 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2066
2067
2068 /*
2069  * Control parameters used by ext4_htree_next_block
2070  */
2071 #define HASH_NB_ALWAYS          1
2072
2073 struct ext4_filename {
2074         const struct qstr *usr_fname;
2075         struct fscrypt_str disk_name;
2076         struct dx_hash_info hinfo;
2077 #ifdef CONFIG_FS_ENCRYPTION
2078         struct fscrypt_str crypto_buf;
2079 #endif
2080 };
2081
2082 #define fname_name(p) ((p)->disk_name.name)
2083 #define fname_len(p)  ((p)->disk_name.len)
2084
2085 /*
2086  * Describe an inode's exact location on disk and in memory
2087  */
2088 struct ext4_iloc
2089 {
2090         struct buffer_head *bh;
2091         unsigned long offset;
2092         ext4_group_t block_group;
2093 };
2094
2095 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2096 {
2097         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2098 }
2099
2100 static inline bool ext4_is_quota_file(struct inode *inode)
2101 {
2102         return IS_NOQUOTA(inode) &&
2103                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2104 }
2105
2106 /*
2107  * This structure is stuffed into the struct file's private_data field
2108  * for directories.  It is where we put information so that we can do
2109  * readdir operations in hash tree order.
2110  */
2111 struct dir_private_info {
2112         struct rb_root  root;
2113         struct rb_node  *curr_node;
2114         struct fname    *extra_fname;
2115         loff_t          last_pos;
2116         __u32           curr_hash;
2117         __u32           curr_minor_hash;
2118         __u32           next_hash;
2119 };
2120
2121 /* calculate the first block number of the group */
2122 static inline ext4_fsblk_t
2123 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2124 {
2125         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2126                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2127 }
2128
2129 /*
2130  * Special error return code only used by dx_probe() and its callers.
2131  */
2132 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2133
2134 /* htree levels for ext4 */
2135 #define EXT4_HTREE_LEVEL_COMPAT 2
2136 #define EXT4_HTREE_LEVEL        3
2137
2138 static inline int ext4_dir_htree_level(struct super_block *sb)
2139 {
2140         return ext4_has_feature_largedir(sb) ?
2141                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2142 }
2143
2144 /*
2145  * Timeout and state flag for lazy initialization inode thread.
2146  */
2147 #define EXT4_DEF_LI_WAIT_MULT                   10
2148 #define EXT4_DEF_LI_MAX_START_DELAY             5
2149 #define EXT4_LAZYINIT_QUIT                      0x0001
2150 #define EXT4_LAZYINIT_RUNNING                   0x0002
2151
2152 /*
2153  * Lazy inode table initialization info
2154  */
2155 struct ext4_lazy_init {
2156         unsigned long           li_state;
2157         struct list_head        li_request_list;
2158         struct mutex            li_list_mtx;
2159 };
2160
2161 struct ext4_li_request {
2162         struct super_block      *lr_super;
2163         struct ext4_sb_info     *lr_sbi;
2164         ext4_group_t            lr_next_group;
2165         struct list_head        lr_request;
2166         unsigned long           lr_next_sched;
2167         unsigned long           lr_timeout;
2168 };
2169
2170 struct ext4_features {
2171         struct kobject f_kobj;
2172         struct completion f_kobj_unregister;
2173 };
2174
2175 /*
2176  * This structure will be used for multiple mount protection. It will be
2177  * written into the block number saved in the s_mmp_block field in the
2178  * superblock. Programs that check MMP should assume that if
2179  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2180  * to use the filesystem, regardless of how old the timestamp is.
2181  */
2182 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2183 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2184 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2185 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2186
2187 struct mmp_struct {
2188         __le32  mmp_magic;              /* Magic number for MMP */
2189         __le32  mmp_seq;                /* Sequence no. updated periodically */
2190
2191         /*
2192          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2193          * purposes and do not affect the correctness of the algorithm
2194          */
2195         __le64  mmp_time;               /* Time last updated */
2196         char    mmp_nodename[64];       /* Node which last updated MMP block */
2197         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2198
2199         /*
2200          * mmp_check_interval is used to verify if the MMP block has been
2201          * updated on the block device. The value is updated based on the
2202          * maximum time to write the MMP block during an update cycle.
2203          */
2204         __le16  mmp_check_interval;
2205
2206         __le16  mmp_pad1;
2207         __le32  mmp_pad2[226];
2208         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2209 };
2210
2211 /* arguments passed to the mmp thread */
2212 struct mmpd_data {
2213         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2214         struct super_block *sb;  /* super block of the fs */
2215 };
2216
2217 /*
2218  * Check interval multiplier
2219  * The MMP block is written every update interval and initially checked every
2220  * update interval x the multiplier (the value is then adapted based on the
2221  * write latency). The reason is that writes can be delayed under load and we
2222  * don't want readers to incorrectly assume that the filesystem is no longer
2223  * in use.
2224  */
2225 #define EXT4_MMP_CHECK_MULT             2UL
2226
2227 /*
2228  * Minimum interval for MMP checking in seconds.
2229  */
2230 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2231
2232 /*
2233  * Maximum interval for MMP checking in seconds.
2234  */
2235 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2236
2237 /*
2238  * Function prototypes
2239  */
2240
2241 /*
2242  * Ok, these declarations are also in <linux/kernel.h> but none of the
2243  * ext4 source programs needs to include it so they are duplicated here.
2244  */
2245 # define NORET_TYPE     /**/
2246 # define ATTRIB_NORET   __attribute__((noreturn))
2247 # define NORET_AND      noreturn,
2248
2249 /* bitmap.c */
2250 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2251 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2252                                 struct ext4_group_desc *gdp,
2253                                 struct buffer_head *bh, int sz);
2254 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2255                                   struct ext4_group_desc *gdp,
2256                                   struct buffer_head *bh, int sz);
2257 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2258                                 struct ext4_group_desc *gdp,
2259                                 struct buffer_head *bh);
2260 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2261                                   struct ext4_group_desc *gdp,
2262                                   struct buffer_head *bh);
2263
2264 /* balloc.c */
2265 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2266                                          ext4_fsblk_t blocknr,
2267                                          ext4_group_t *blockgrpp,
2268                                          ext4_grpblk_t *offsetp);
2269 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2270                                           ext4_fsblk_t block);
2271
2272 extern unsigned int ext4_block_group(struct super_block *sb,
2273                         ext4_fsblk_t blocknr);
2274 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2275                         ext4_fsblk_t blocknr);
2276 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2277 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2278                         ext4_group_t group);
2279 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2280                                          ext4_fsblk_t goal,
2281                                          unsigned int flags,
2282                                          unsigned long *count,
2283                                          int *errp);
2284 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2285                                     s64 nclusters, unsigned int flags);
2286 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2287 extern void ext4_check_blocks_bitmap(struct super_block *);
2288 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2289                                                     ext4_group_t block_group,
2290                                                     struct buffer_head ** bh);
2291 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2292
2293 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2294                                                 ext4_group_t block_group);
2295 extern int ext4_wait_block_bitmap(struct super_block *sb,
2296                                   ext4_group_t block_group,
2297                                   struct buffer_head *bh);
2298 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2299                                                   ext4_group_t block_group);
2300 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2301                                               ext4_group_t block_group,
2302                                               struct ext4_group_desc *gdp);
2303 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2304
2305 #ifdef CONFIG_FS_ENCRYPTION
2306 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2307                                                 const struct fscrypt_name *src)
2308 {
2309         memset(dst, 0, sizeof(*dst));
2310
2311         dst->usr_fname = src->usr_fname;
2312         dst->disk_name = src->disk_name;
2313         dst->hinfo.hash = src->hash;
2314         dst->hinfo.minor_hash = src->minor_hash;
2315         dst->crypto_buf = src->crypto_buf;
2316 }
2317
2318 static inline int ext4_fname_setup_filename(struct inode *dir,
2319                                             const struct qstr *iname,
2320                                             int lookup,
2321                                             struct ext4_filename *fname)
2322 {
2323         struct fscrypt_name name;
2324         int err;
2325
2326         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2327         if (err)
2328                 return err;
2329
2330         ext4_fname_from_fscrypt_name(fname, &name);
2331         return 0;
2332 }
2333
2334 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2335                                             struct dentry *dentry,
2336                                             struct ext4_filename *fname)
2337 {
2338         struct fscrypt_name name;
2339         int err;
2340
2341         err = fscrypt_prepare_lookup(dir, dentry, &name);
2342         if (err)
2343                 return err;
2344
2345         ext4_fname_from_fscrypt_name(fname, &name);
2346         return 0;
2347 }
2348
2349 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2350 {
2351         struct fscrypt_name name;
2352
2353         name.crypto_buf = fname->crypto_buf;
2354         fscrypt_free_filename(&name);
2355
2356         fname->crypto_buf.name = NULL;
2357         fname->usr_fname = NULL;
2358         fname->disk_name.name = NULL;
2359 }
2360 #else /* !CONFIG_FS_ENCRYPTION */
2361 static inline int ext4_fname_setup_filename(struct inode *dir,
2362                                             const struct qstr *iname,
2363                                             int lookup,
2364                                             struct ext4_filename *fname)
2365 {
2366         fname->usr_fname = iname;
2367         fname->disk_name.name = (unsigned char *) iname->name;
2368         fname->disk_name.len = iname->len;
2369         return 0;
2370 }
2371
2372 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2373                                             struct dentry *dentry,
2374                                             struct ext4_filename *fname)
2375 {
2376         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2377 }
2378
2379 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2380 #endif /* !CONFIG_FS_ENCRYPTION */
2381
2382 /* dir.c */
2383 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2384                                   struct file *,
2385                                   struct ext4_dir_entry_2 *,
2386                                   struct buffer_head *, char *, int,
2387                                   unsigned int);
2388 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2389         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2390                                         (de), (bh), (buf), (size), (offset)))
2391 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2392                                 __u32 minor_hash,
2393                                 struct ext4_dir_entry_2 *dirent,
2394                                 struct fscrypt_str *ent_name);
2395 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2396 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2397                              struct buffer_head *bh,
2398                              void *buf, int buf_size,
2399                              struct ext4_filename *fname,
2400                              struct ext4_dir_entry_2 **dest_de);
2401 void ext4_insert_dentry(struct inode *inode,
2402                         struct ext4_dir_entry_2 *de,
2403                         int buf_size,
2404                         struct ext4_filename *fname);
2405 static inline void ext4_update_dx_flag(struct inode *inode)
2406 {
2407         if (!ext4_has_feature_dir_index(inode->i_sb))
2408                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2409 }
2410 static const unsigned char ext4_filetype_table[] = {
2411         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2412 };
2413
2414 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2415 {
2416         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2417                 return DT_UNKNOWN;
2418
2419         return ext4_filetype_table[filetype];
2420 }
2421 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2422                              void *buf, int buf_size);
2423
2424 /* fsync.c */
2425 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2426
2427 /* hash.c */
2428 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2429                           struct dx_hash_info *hinfo);
2430
2431 /* ialloc.c */
2432 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2433                                       const struct qstr *qstr, __u32 goal,
2434                                       uid_t *owner, __u32 i_flags,
2435                                       int handle_type, unsigned int line_no,
2436                                       int nblocks);
2437
2438 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2439         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2440                          i_flags, 0, 0, 0)
2441 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2442                                     type, nblocks)                  \
2443         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2444                          0, (type), __LINE__, (nblocks))
2445
2446
2447 extern void ext4_free_inode(handle_t *, struct inode *);
2448 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2449 extern unsigned long ext4_count_free_inodes(struct super_block *);
2450 extern unsigned long ext4_count_dirs(struct super_block *);
2451 extern void ext4_check_inodes_bitmap(struct super_block *);
2452 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2453 extern int ext4_init_inode_table(struct super_block *sb,
2454                                  ext4_group_t group, int barrier);
2455 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2456
2457 /* mballoc.c */
2458 extern const struct seq_operations ext4_mb_seq_groups_ops;
2459 extern long ext4_mb_stats;
2460 extern long ext4_mb_max_to_scan;
2461 extern int ext4_mb_init(struct super_block *);
2462 extern int ext4_mb_release(struct super_block *);
2463 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2464                                 struct ext4_allocation_request *, int *);
2465 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2466 extern void ext4_discard_preallocations(struct inode *);
2467 extern int __init ext4_init_mballoc(void);
2468 extern void ext4_exit_mballoc(void);
2469 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2470                              struct buffer_head *bh, ext4_fsblk_t block,
2471                              unsigned long count, int flags);
2472 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2473                                    ext4_group_t ngroups);
2474 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2475                 ext4_group_t i, struct ext4_group_desc *desc);
2476 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2477                                 ext4_fsblk_t block, unsigned long count);
2478 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2479 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2480
2481 /* inode.c */
2482 int ext4_inode_is_fast_symlink(struct inode *inode);
2483 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2484 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2485 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2486                      bool wait, struct buffer_head **bhs);
2487 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2488                              struct buffer_head *bh_result, int create);
2489 int ext4_get_block(struct inode *inode, sector_t iblock,
2490                    struct buffer_head *bh_result, int create);
2491 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2492                        struct buffer_head *bh_result, int create);
2493 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2494                            struct buffer_head *bh, int create);
2495 int ext4_walk_page_buffers(handle_t *handle,
2496                            struct buffer_head *head,
2497                            unsigned from,
2498                            unsigned to,
2499                            int *partial,
2500                            int (*fn)(handle_t *handle,
2501                                      struct buffer_head *bh));
2502 int do_journal_get_write_access(handle_t *handle,
2503                                 struct buffer_head *bh);
2504 #define FALL_BACK_TO_NONDELALLOC 1
2505 #define CONVERT_INLINE_DATA      2
2506
2507 typedef enum {
2508         EXT4_IGET_NORMAL =      0,
2509         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2510         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2511 } ext4_iget_flags;
2512
2513 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2514                                  ext4_iget_flags flags, const char *function,
2515                                  unsigned int line);
2516
2517 #define ext4_iget(sb, ino, flags) \
2518         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2519
2520 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2521 extern int  ext4_setattr(struct dentry *, struct iattr *);
2522 extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2523 extern void ext4_evict_inode(struct inode *);
2524 extern void ext4_clear_inode(struct inode *);
2525 extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2526 extern int  ext4_sync_inode(handle_t *, struct inode *);
2527 extern void ext4_dirty_inode(struct inode *, int);
2528 extern int ext4_change_inode_journal_flag(struct inode *, int);
2529 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2530 extern int ext4_inode_attach_jinode(struct inode *inode);
2531 extern int ext4_can_truncate(struct inode *inode);
2532 extern int ext4_truncate(struct inode *);
2533 extern int ext4_break_layouts(struct inode *);
2534 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2535 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2536 extern void ext4_set_inode_flags(struct inode *);
2537 extern int ext4_alloc_da_blocks(struct inode *inode);
2538 extern void ext4_set_aops(struct inode *inode);
2539 extern int ext4_writepage_trans_blocks(struct inode *);
2540 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2541 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2542                              loff_t lstart, loff_t lend);
2543 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2544 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2545 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2546 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2547 extern void ext4_da_release_space(struct inode *inode, int to_free);
2548 extern void ext4_da_update_reserve_space(struct inode *inode,
2549                                         int used, int quota_claim);
2550 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2551                               ext4_fsblk_t pblk, ext4_lblk_t len);
2552
2553 /* indirect.c */
2554 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2555                                 struct ext4_map_blocks *map, int flags);
2556 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2557 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2558 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2559 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2560                                  ext4_lblk_t start, ext4_lblk_t end);
2561
2562 /* ioctl.c */
2563 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2564 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2565
2566 /* migrate.c */
2567 extern int ext4_ext_migrate(struct inode *);
2568 extern int ext4_ind_migrate(struct inode *inode);
2569
2570 /* namei.c */
2571 extern int ext4_dirent_csum_verify(struct inode *inode,
2572                                    struct ext4_dir_entry *dirent);
2573 extern int ext4_orphan_add(handle_t *, struct inode *);
2574 extern int ext4_orphan_del(handle_t *, struct inode *);
2575 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2576                                 __u32 start_minor_hash, __u32 *next_hash);
2577 extern int ext4_search_dir(struct buffer_head *bh,
2578                            char *search_buf,
2579                            int buf_size,
2580                            struct inode *dir,
2581                            struct ext4_filename *fname,
2582                            unsigned int offset,
2583                            struct ext4_dir_entry_2 **res_dir);
2584 extern int ext4_generic_delete_entry(handle_t *handle,
2585                                      struct inode *dir,
2586                                      struct ext4_dir_entry_2 *de_del,
2587                                      struct buffer_head *bh,
2588                                      void *entry_buf,
2589                                      int buf_size,
2590                                      int csum_size);
2591 extern bool ext4_empty_dir(struct inode *inode);
2592
2593 /* resize.c */
2594 extern int ext4_group_add(struct super_block *sb,
2595                                 struct ext4_new_group_data *input);
2596 extern int ext4_group_extend(struct super_block *sb,
2597                                 struct ext4_super_block *es,
2598                                 ext4_fsblk_t n_blocks_count);
2599 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2600
2601 /* super.c */
2602 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2603                                          sector_t block, int op_flags);
2604 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2605 extern int ext4_calculate_overhead(struct super_block *sb);
2606 extern void ext4_superblock_csum_set(struct super_block *sb);
2607 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2608 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2609 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2610                                     ext4_group_t ngroup);
2611 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2612                                      char nbuf[16]);
2613 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2614                                              ext4_group_t block_group,
2615                                              unsigned int flags);
2616
2617 extern __printf(4, 5)
2618 void __ext4_error(struct super_block *, const char *, unsigned int,
2619                   const char *, ...);
2620 extern __printf(5, 6)
2621 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2622                       const char *, ...);
2623 extern __printf(5, 6)
2624 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2625                      const char *, ...);
2626 extern void __ext4_std_error(struct super_block *, const char *,
2627                              unsigned int, int);
2628 extern __printf(4, 5)
2629 void __ext4_abort(struct super_block *, const char *, unsigned int,
2630                   const char *, ...);
2631 extern __printf(4, 5)
2632 void __ext4_warning(struct super_block *, const char *, unsigned int,
2633                     const char *, ...);
2634 extern __printf(4, 5)
2635 void __ext4_warning_inode(const struct inode *inode, const char *function,
2636                           unsigned int line, const char *fmt, ...);
2637 extern __printf(3, 4)
2638 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2639 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2640                            const char *, unsigned int, const char *);
2641 extern __printf(7, 8)
2642 void __ext4_grp_locked_error(const char *, unsigned int,
2643                              struct super_block *, ext4_group_t,
2644                              unsigned long, ext4_fsblk_t,
2645                              const char *, ...);
2646
2647 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2648         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2649
2650 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2651         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2652
2653 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2654         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2655
2656 #ifdef CONFIG_PRINTK
2657
2658 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2659         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2660 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2661         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2662 #define ext4_error(sb, fmt, ...)                                        \
2663         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2664 #define ext4_abort(sb, fmt, ...)                                        \
2665         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2666 #define ext4_warning(sb, fmt, ...)                                      \
2667         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2668 #define ext4_warning_inode(inode, fmt, ...)                             \
2669         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2670 #define ext4_msg(sb, level, fmt, ...)                           \
2671         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2672 #define dump_mmp_msg(sb, mmp, msg)                                      \
2673         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2674 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2675         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2676                                 fmt, ##__VA_ARGS__)
2677
2678 #else
2679
2680 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2681 do {                                                                    \
2682         no_printk(fmt, ##__VA_ARGS__);                                  \
2683         __ext4_error_inode(inode, "", 0, block, " ");                   \
2684 } while (0)
2685 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2686 do {                                                                    \
2687         no_printk(fmt, ##__VA_ARGS__);                                  \
2688         __ext4_error_file(file, "", 0, block, " ");                     \
2689 } while (0)
2690 #define ext4_error(sb, fmt, ...)                                        \
2691 do {                                                                    \
2692         no_printk(fmt, ##__VA_ARGS__);                                  \
2693         __ext4_error(sb, "", 0, " ");                                   \
2694 } while (0)
2695 #define ext4_abort(sb, fmt, ...)                                        \
2696 do {                                                                    \
2697         no_printk(fmt, ##__VA_ARGS__);                                  \
2698         __ext4_abort(sb, "", 0, " ");                                   \
2699 } while (0)
2700 #define ext4_warning(sb, fmt, ...)                                      \
2701 do {                                                                    \
2702         no_printk(fmt, ##__VA_ARGS__);                                  \
2703         __ext4_warning(sb, "", 0, " ");                                 \
2704 } while (0)
2705 #define ext4_warning_inode(inode, fmt, ...)                             \
2706 do {                                                                    \
2707         no_printk(fmt, ##__VA_ARGS__);                                  \
2708         __ext4_warning_inode(inode, "", 0, " ");                        \
2709 } while (0)
2710 #define ext4_msg(sb, level, fmt, ...)                                   \
2711 do {                                                                    \
2712         no_printk(fmt, ##__VA_ARGS__);                                  \
2713         __ext4_msg(sb, "", " ");                                        \
2714 } while (0)
2715 #define dump_mmp_msg(sb, mmp, msg)                                      \
2716         __dump_mmp_msg(sb, mmp, "", 0, "")
2717 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2718 do {                                                                    \
2719         no_printk(fmt, ##__VA_ARGS__);                          \
2720         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2721 } while (0)
2722
2723 #endif
2724
2725 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2726                                         __u32 compat);
2727 extern int ext4_update_rocompat_feature(handle_t *handle,
2728                                         struct super_block *sb, __u32 rocompat);
2729 extern int ext4_update_incompat_feature(handle_t *handle,
2730                                         struct super_block *sb, __u32 incompat);
2731 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2732                                       struct ext4_group_desc *bg);
2733 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2734                                       struct ext4_group_desc *bg);
2735 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2736                                      struct ext4_group_desc *bg);
2737 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2738                                       struct ext4_group_desc *bg);
2739 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2740                                  struct ext4_group_desc *bg);
2741 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2742                                 struct ext4_group_desc *bg);
2743 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2744                                    struct ext4_group_desc *bg);
2745 extern void ext4_block_bitmap_set(struct super_block *sb,
2746                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2747 extern void ext4_inode_bitmap_set(struct super_block *sb,
2748                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2749 extern void ext4_inode_table_set(struct super_block *sb,
2750                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2751 extern void ext4_free_group_clusters_set(struct super_block *sb,
2752                                          struct ext4_group_desc *bg,
2753                                          __u32 count);
2754 extern void ext4_free_inodes_set(struct super_block *sb,
2755                                 struct ext4_group_desc *bg, __u32 count);
2756 extern void ext4_used_dirs_set(struct super_block *sb,
2757                                 struct ext4_group_desc *bg, __u32 count);
2758 extern void ext4_itable_unused_set(struct super_block *sb,
2759                                    struct ext4_group_desc *bg, __u32 count);
2760 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2761                                        struct ext4_group_desc *gdp);
2762 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2763                                      struct ext4_group_desc *gdp);
2764 extern int ext4_register_li_request(struct super_block *sb,
2765                                     ext4_group_t first_not_zeroed);
2766
2767 static inline int ext4_has_metadata_csum(struct super_block *sb)
2768 {
2769         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2770                      !EXT4_SB(sb)->s_chksum_driver);
2771
2772         return ext4_has_feature_metadata_csum(sb) &&
2773                (EXT4_SB(sb)->s_chksum_driver != NULL);
2774 }
2775
2776 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2777 {
2778         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2779 }
2780
2781 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2782 {
2783         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2784                 le32_to_cpu(es->s_blocks_count_lo);
2785 }
2786
2787 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2788 {
2789         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2790                 le32_to_cpu(es->s_r_blocks_count_lo);
2791 }
2792
2793 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2794 {
2795         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2796                 le32_to_cpu(es->s_free_blocks_count_lo);
2797 }
2798
2799 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2800                                          ext4_fsblk_t blk)
2801 {
2802         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2803         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2804 }
2805
2806 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2807                                               ext4_fsblk_t blk)
2808 {
2809         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2810         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2811 }
2812
2813 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2814                                            ext4_fsblk_t blk)
2815 {
2816         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2817         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2818 }
2819
2820 static inline loff_t ext4_isize(struct super_block *sb,
2821                                 struct ext4_inode *raw_inode)
2822 {
2823         if (ext4_has_feature_largedir(sb) ||
2824             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2825                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2826                         le32_to_cpu(raw_inode->i_size_lo);
2827
2828         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2829 }
2830
2831 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2832 {
2833         raw_inode->i_size_lo = cpu_to_le32(i_size);
2834         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2835 }
2836
2837 static inline
2838 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2839                                             ext4_group_t group)
2840 {
2841          struct ext4_group_info ***grp_info;
2842          long indexv, indexh;
2843          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2844          grp_info = EXT4_SB(sb)->s_group_info;
2845          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2846          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2847          return grp_info[indexv][indexh];
2848 }
2849
2850 /*
2851  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2852  * the locking protocol documented in the comments of ext4_group_add()
2853  * in resize.c
2854  */
2855 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2856 {
2857         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2858
2859         smp_rmb();
2860         return ngroups;
2861 }
2862
2863 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2864                                              ext4_group_t block_group)
2865 {
2866         return block_group >> sbi->s_log_groups_per_flex;
2867 }
2868
2869 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2870 {
2871         return 1 << sbi->s_log_groups_per_flex;
2872 }
2873
2874 #define ext4_std_error(sb, errno)                               \
2875 do {                                                            \
2876         if ((errno))                                            \
2877                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2878 } while (0)
2879
2880 #ifdef CONFIG_SMP
2881 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2882  * counters. So we need to make sure we have free clusters more
2883  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2884  */
2885 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2886 #else
2887 #define EXT4_FREECLUSTERS_WATERMARK 0
2888 #endif
2889
2890 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2891 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2892 {
2893         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2894                      !inode_is_locked(inode));
2895         down_write(&EXT4_I(inode)->i_data_sem);
2896         if (newsize > EXT4_I(inode)->i_disksize)
2897                 EXT4_I(inode)->i_disksize = newsize;
2898         up_write(&EXT4_I(inode)->i_data_sem);
2899 }
2900
2901 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2902 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2903 {
2904         int changed = 0;
2905
2906         if (newsize > inode->i_size) {
2907                 i_size_write(inode, newsize);
2908                 changed = 1;
2909         }
2910         if (newsize > EXT4_I(inode)->i_disksize) {
2911                 ext4_update_i_disksize(inode, newsize);
2912                 changed |= 2;
2913         }
2914         return changed;
2915 }
2916
2917 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2918                                       loff_t len);
2919
2920 struct ext4_group_info {
2921         unsigned long   bb_state;
2922         struct rb_root  bb_free_root;
2923         ext4_grpblk_t   bb_first_free;  /* first free block */
2924         ext4_grpblk_t   bb_free;        /* total free blocks */
2925         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2926         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2927         struct          list_head bb_prealloc_list;
2928 #ifdef DOUBLE_CHECK
2929         void            *bb_bitmap;
2930 #endif
2931         struct rw_semaphore alloc_sem;
2932         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2933                                          * regions, index is order.
2934                                          * bb_counters[3] = 5 means
2935                                          * 5 free 8-block regions. */
2936 };
2937
2938 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2939 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2940 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2941 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2942 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
2943         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2944 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
2945         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
2946
2947 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2948         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2949 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2950         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2951 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2952         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2953
2954 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2955         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2956 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2957         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2958 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2959         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2960
2961 #define EXT4_MAX_CONTENTION             8
2962 #define EXT4_CONTENTION_THRESHOLD       2
2963
2964 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2965                                               ext4_group_t group)
2966 {
2967         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2968 }
2969
2970 /*
2971  * Returns true if the filesystem is busy enough that attempts to
2972  * access the block group locks has run into contention.
2973  */
2974 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2975 {
2976         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2977 }
2978
2979 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2980 {
2981         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2982         if (spin_trylock(lock))
2983                 /*
2984                  * We're able to grab the lock right away, so drop the
2985                  * lock contention counter.
2986                  */
2987                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2988         else {
2989                 /*
2990                  * The lock is busy, so bump the contention counter,
2991                  * and then wait on the spin lock.
2992                  */
2993                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2994                                   EXT4_MAX_CONTENTION);
2995                 spin_lock(lock);
2996         }
2997 }
2998
2999 static inline void ext4_unlock_group(struct super_block *sb,
3000                                         ext4_group_t group)
3001 {
3002         spin_unlock(ext4_group_lock_ptr(sb, group));
3003 }
3004
3005 /*
3006  * Block validity checking
3007  */
3008 #define ext4_check_indirect_blockref(inode, bh)                         \
3009         ext4_check_blockref(__func__, __LINE__, inode,                  \
3010                             (__le32 *)(bh)->b_data,                     \
3011                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3012
3013 #define ext4_ind_check_inode(inode)                                     \
3014         ext4_check_blockref(__func__, __LINE__, inode,                  \
3015                             EXT4_I(inode)->i_data,                      \
3016                             EXT4_NDIR_BLOCKS)
3017
3018 /*
3019  * Inodes and files operations
3020  */
3021
3022 /* dir.c */
3023 extern const struct file_operations ext4_dir_operations;
3024
3025 #ifdef CONFIG_UNICODE
3026 extern const struct dentry_operations ext4_dentry_ops;
3027 #endif
3028
3029 /* file.c */
3030 extern const struct inode_operations ext4_file_inode_operations;
3031 extern const struct file_operations ext4_file_operations;
3032 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3033
3034 /* inline.c */
3035 extern int ext4_get_max_inline_size(struct inode *inode);
3036 extern int ext4_find_inline_data_nolock(struct inode *inode);
3037 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3038                                  unsigned int len);
3039 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3040
3041 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3042 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3043                                          struct inode *inode,
3044                                          loff_t pos, unsigned len,
3045                                          unsigned flags,
3046                                          struct page **pagep);
3047 extern int ext4_write_inline_data_end(struct inode *inode,
3048                                       loff_t pos, unsigned len,
3049                                       unsigned copied,
3050                                       struct page *page);
3051 extern struct buffer_head *
3052 ext4_journalled_write_inline_data(struct inode *inode,
3053                                   unsigned len,
3054                                   struct page *page);
3055 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3056                                            struct inode *inode,
3057                                            loff_t pos, unsigned len,
3058                                            unsigned flags,
3059                                            struct page **pagep,
3060                                            void **fsdata);
3061 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3062                                          unsigned len, unsigned copied,
3063                                          struct page *page);
3064 extern int ext4_try_add_inline_entry(handle_t *handle,
3065                                      struct ext4_filename *fname,
3066                                      struct inode *dir, struct inode *inode);
3067 extern int ext4_try_create_inline_dir(handle_t *handle,
3068                                       struct inode *parent,
3069                                       struct inode *inode);
3070 extern int ext4_read_inline_dir(struct file *filp,
3071                                 struct dir_context *ctx,
3072                                 int *has_inline_data);
3073 extern int htree_inlinedir_to_tree(struct file *dir_file,
3074                                    struct inode *dir, ext4_lblk_t block,
3075                                    struct dx_hash_info *hinfo,
3076                                    __u32 start_hash, __u32 start_minor_hash,
3077                                    int *has_inline_data);
3078 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3079                                         struct ext4_filename *fname,
3080                                         struct ext4_dir_entry_2 **res_dir,
3081                                         int *has_inline_data);
3082 extern int ext4_delete_inline_entry(handle_t *handle,
3083                                     struct inode *dir,
3084                                     struct ext4_dir_entry_2 *de_del,
3085                                     struct buffer_head *bh,
3086                                     int *has_inline_data);
3087 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3088 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3089                                         struct ext4_dir_entry_2 **parent_de,
3090                                         int *retval);
3091 extern int ext4_inline_data_fiemap(struct inode *inode,
3092                                    struct fiemap_extent_info *fieinfo,
3093                                    int *has_inline, __u64 start, __u64 len);
3094
3095 struct iomap;
3096 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3097
3098 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3099
3100 extern int ext4_convert_inline_data(struct inode *inode);
3101
3102 static inline int ext4_has_inline_data(struct inode *inode)
3103 {
3104         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3105                EXT4_I(inode)->i_inline_off;
3106 }
3107
3108 /* namei.c */
3109 extern const struct inode_operations ext4_dir_inode_operations;
3110 extern const struct inode_operations ext4_special_inode_operations;
3111 extern struct dentry *ext4_get_parent(struct dentry *child);
3112 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3113                                  struct ext4_dir_entry_2 *de,
3114                                  int blocksize, int csum_size,
3115                                  unsigned int parent_ino, int dotdot_real_len);
3116 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3117                                    unsigned int blocksize);
3118 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3119                                          struct inode *inode,
3120                                          struct buffer_head *bh);
3121 extern int ext4_ci_compare(const struct inode *parent,
3122                            const struct qstr *name,
3123                            const struct qstr *entry);
3124
3125 #define S_SHIFT 12
3126 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3127         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3128         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3129         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3130         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3131         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3132         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3133         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3134 };
3135
3136 static inline void ext4_set_de_type(struct super_block *sb,
3137                                 struct ext4_dir_entry_2 *de,
3138                                 umode_t mode) {
3139         if (ext4_has_feature_filetype(sb))
3140                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3141 }
3142
3143 /* readpages.c */
3144 extern int ext4_mpage_readpages(struct address_space *mapping,
3145                                 struct list_head *pages, struct page *page,
3146                                 unsigned nr_pages, bool is_readahead);
3147
3148 /* symlink.c */
3149 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3150 extern const struct inode_operations ext4_symlink_inode_operations;
3151 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3152
3153 /* sysfs.c */
3154 extern int ext4_register_sysfs(struct super_block *sb);
3155 extern void ext4_unregister_sysfs(struct super_block *sb);
3156 extern int __init ext4_init_sysfs(void);
3157 extern void ext4_exit_sysfs(void);
3158
3159 /* block_validity */
3160 extern void ext4_release_system_zone(struct super_block *sb);
3161 extern int ext4_setup_system_zone(struct super_block *sb);
3162 extern int __init ext4_init_system_zone(void);
3163 extern void ext4_exit_system_zone(void);
3164 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3165                                  ext4_fsblk_t start_blk,
3166                                  unsigned int count);
3167 extern int ext4_check_blockref(const char *, unsigned int,
3168                                struct inode *, __le32 *, unsigned int);
3169
3170 /* extents.c */
3171 struct ext4_ext_path;
3172 struct ext4_extent;
3173
3174 /*
3175  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3176  * __le32.
3177  */
3178 #define EXT_MAX_BLOCKS  0xffffffff
3179
3180 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3181 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3182 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3183 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3184                                struct ext4_map_blocks *map, int flags);
3185 extern int ext4_ext_truncate(handle_t *, struct inode *);
3186 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3187                                  ext4_lblk_t end);
3188 extern void ext4_ext_init(struct super_block *);
3189 extern void ext4_ext_release(struct super_block *);
3190 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3191                           loff_t len);
3192 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3193                                           loff_t offset, ssize_t len);
3194 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3195                            struct ext4_map_blocks *map, int flags);
3196 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3197                                          ext4_lblk_t lblocks);
3198 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3199                                                    int num,
3200                                                    struct ext4_ext_path *path);
3201 extern int ext4_can_extents_be_merged(struct inode *inode,
3202                                       struct ext4_extent *ex1,
3203                                       struct ext4_extent *ex2);
3204 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3205                                   struct ext4_ext_path **,
3206                                   struct ext4_extent *, int);
3207 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3208                                               struct ext4_ext_path **,
3209                                               int flags);
3210 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3211 extern int ext4_ext_check_inode(struct inode *inode);
3212 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3213 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3214                         __u64 start, __u64 len);
3215 extern int ext4_ext_precache(struct inode *inode);
3216 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3217 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3218 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3219                                 struct inode *inode2, ext4_lblk_t lblk1,
3220                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3221                              int mark_unwritten,int *err);
3222 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3223
3224 /* move_extent.c */
3225 extern void ext4_double_down_write_data_sem(struct inode *first,
3226                                             struct inode *second);
3227 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3228                                           struct inode *donor_inode);
3229 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3230                              __u64 start_orig, __u64 start_donor,
3231                              __u64 len, __u64 *moved_len);
3232
3233 /* page-io.c */
3234 extern int __init ext4_init_pageio(void);
3235 extern void ext4_exit_pageio(void);
3236 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3237 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3238 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3239 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3240 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3241                                 struct writeback_control *wbc);
3242 extern void ext4_end_io_rsv_work(struct work_struct *work);
3243 extern void ext4_io_submit(struct ext4_io_submit *io);
3244 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3245                                struct page *page,
3246                                int len,
3247                                struct writeback_control *wbc,
3248                                bool keep_towrite);
3249
3250 /* mmp.c */
3251 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3252
3253 /*
3254  * Add new method to test whether block and inode bitmaps are properly
3255  * initialized. With uninit_bg reading the block from disk is not enough
3256  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3257  */
3258 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3259
3260 static inline int bitmap_uptodate(struct buffer_head *bh)
3261 {
3262         return (buffer_uptodate(bh) &&
3263                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3264 }
3265 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3266 {
3267         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3268 }
3269
3270 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3271
3272 /* For ioend & aio unwritten conversion wait queues */
3273 #define EXT4_WQ_HASH_SZ         37
3274 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3275                                             EXT4_WQ_HASH_SZ])
3276 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3277
3278 extern int ext4_resize_begin(struct super_block *sb);
3279 extern void ext4_resize_end(struct super_block *sb);
3280
3281 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3282                                               struct ext4_io_end *io_end)
3283 {
3284         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3285                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3286                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3287         }
3288 }
3289
3290 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3291 {
3292         struct inode *inode = io_end->inode;
3293
3294         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3295                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3296                 /* Wake up anyone waiting on unwritten extent conversion */
3297                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3298                         wake_up_all(ext4_ioend_wq(inode));
3299         }
3300 }
3301
3302 extern const struct iomap_ops ext4_iomap_ops;
3303
3304 #endif  /* __KERNEL__ */
3305
3306 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3307 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3308
3309 #endif  /* _EXT4_H */