fs/ext4/ext4.h

   1 /*
   2  *  ext4.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _EXT4_H
  17 #define _EXT4_H
  18
  19 #include <linux/types.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/magic.h>
  22 #include <linux/jbd2.h>
  23 #include <linux/quota.h>
  24 #include <linux/rwsem.h>
  25 #include <linux/rbtree.h>
  26 #include <linux/seqlock.h>
  27 #include <linux/mutex.h>
  28 #include <linux/timer.h>
  29 #include <linux/version.h>
  30 #include <linux/wait.h>
  31 #include <linux/blockgroup_lock.h>
  32 #include <linux/percpu_counter.h>
  33 #include <linux/ratelimit.h>
  34 #include <crypto/hash.h>
  35 #include <linux/falloc.h>
  36 #ifdef __KERNEL__
  37 #include <linux/compat.h>
  38 #endif
  39
  40 /*
  41  * The fourth extended filesystem constants/structures
  42  */
  43
  44 /*
  45  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  46  * structures. these checks slow things down a lot
  47  */
  48 #define AGGRESSIVE_CHECK__
  49
  50 /*
  51  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  52  * bitmaps, maintains and uses them to check for double allocations
  53  */
  54 #define DOUBLE_CHECK__
  55
  56 /*
  57  * Define EXT4FS_DEBUG to produce debug messages
  58  */
  59 #undef EXT4FS_DEBUG
  60
  61 /*
  62  * Debug code
  63  */
  64 #ifdef EXT4FS_DEBUG
  65 #define ext4_debug(f, a...)                                             \
  66         do {                                                            \
  67                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  68                         __FILE__, __LINE__, __func__);                  \
  69                 printk(KERN_DEBUG f, ## a);                             \
  70         } while (0)
  71 #else
  72 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  73 #endif
  74
  75 /*
  76  * Turn on EXT_DEBUG to get lots of info about extents operations.
  77  */
  78 #define EXT_DEBUG__
  79 #ifdef EXT_DEBUG
  80 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  81 #else
  82 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  83 #endif
  84
  85 /* data type for block offset of block group */
  86 typedef int ext4_grpblk_t;
  87
  88 /* data type for filesystem-wide blocks number */
  89 typedef unsigned long long ext4_fsblk_t;
  90
  91 /* data type for file logical block number */
  92 typedef __u32 ext4_lblk_t;
  93
  94 /* data type for block group number */
  95 typedef unsigned int ext4_group_t;
  96
  97 enum SHIFT_DIRECTION {
  98         SHIFT_LEFT = 0,
  99         SHIFT_RIGHT,
 100 };
 101
 102 /*
 103  * Flags used in mballoc's allocation_context flags field.
 104  *
 105  * Also used to show what's going on for debugging purposes when the
 106  * flag field is exported via the traceport interface
 107  */
 108
 109 /* prefer goal again. length */
 110 #define EXT4_MB_HINT_MERGE              0x0001
 111 /* blocks already reserved */
 112 #define EXT4_MB_HINT_RESERVED           0x0002
 113 /* metadata is being allocated */
 114 #define EXT4_MB_HINT_METADATA           0x0004
 115 /* first blocks in the file */
 116 #define EXT4_MB_HINT_FIRST              0x0008
 117 /* search for the best chunk */
 118 #define EXT4_MB_HINT_BEST               0x0010
 119 /* data is being allocated */
 120 #define EXT4_MB_HINT_DATA               0x0020
 121 /* don't preallocate (for tails) */
 122 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 123 /* allocate for locality group */
 124 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 125 /* allocate goal blocks or none */
 126 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 127 /* goal is meaningful */
 128 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 129 /* blocks already pre-reserved by delayed allocation */
 130 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 131 /* We are doing stream allocation */
 132 #define EXT4_MB_STREAM_ALLOC            0x0800
 133 /* Use reserved root blocks if needed */
 134 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 135 /* Use blocks from reserved pool */
 136 #define EXT4_MB_USE_RESERVED            0x2000
 137
 138 struct ext4_allocation_request {
 139         /* target inode for block we're allocating */
 140         struct inode *inode;
 141         /* how many blocks we want to allocate */
 142         unsigned int len;
 143         /* logical block in target inode */
 144         ext4_lblk_t logical;
 145         /* the closest logical allocated block to the left */
 146         ext4_lblk_t lleft;
 147         /* the closest logical allocated block to the right */
 148         ext4_lblk_t lright;
 149         /* phys. target (a hint) */
 150         ext4_fsblk_t goal;
 151         /* phys. block for the closest logical allocated block to the left */
 152         ext4_fsblk_t pleft;
 153         /* phys. block for the closest logical allocated block to the right */
 154         ext4_fsblk_t pright;
 155         /* flags. see above EXT4_MB_HINT_* */
 156         unsigned int flags;
 157 };
 158
 159 /*
 160  * Logical to physical block mapping, used by ext4_map_blocks()
 161  *
 162  * This structure is used to pass requests into ext4_map_blocks() as
 163  * well as to store the information returned by ext4_map_blocks().  It
 164  * takes less room on the stack than a struct buffer_head.
 165  */
 166 #define EXT4_MAP_NEW            (1 << BH_New)
 167 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 168 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 169 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 170 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 171                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 172
 173 struct ext4_map_blocks {
 174         ext4_fsblk_t m_pblk;
 175         ext4_lblk_t m_lblk;
 176         unsigned int m_len;
 177         unsigned int m_flags;
 178 };
 179
 180 /*
 181  * Flags for ext4_io_end->flags
 182  */
 183 #define EXT4_IO_END_UNWRITTEN   0x0001
 184
 185 /*
 186  * For converting unwritten extents on a work queue. 'handle' is used for
 187  * buffered writeback.
 188  */
 189 typedef struct ext4_io_end {
 190         struct list_head        list;           /* per-file finished IO list */
 191         handle_t                *handle;        /* handle reserved for extent
 192                                                  * conversion */
 193         struct inode            *inode;         /* file being written to */
 194         struct bio              *bio;           /* Linked list of completed
 195                                                  * bios covering the extent */
 196         unsigned int            flag;           /* unwritten or not */
 197         atomic_t                count;          /* reference counter */
 198         loff_t                  offset;         /* offset in the file */
 199         ssize_t                 size;           /* size of the extent */
 200 } ext4_io_end_t;
 201
 202 struct ext4_io_submit {
 203         struct writeback_control *io_wbc;
 204         struct bio              *io_bio;
 205         ext4_io_end_t           *io_end;
 206         sector_t                io_next_block;
 207 };
 208
 209 /*
 210  * Special inodes numbers
 211  */
 212 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 213 #define EXT4_ROOT_INO            2      /* Root inode */
 214 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 215 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 216 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 217 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 218 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 219 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 220
 221 /* First non-reserved inode for old ext4 filesystems */
 222 #define EXT4_GOOD_OLD_FIRST_INO 11
 223
 224 /*
 225  * Maximal count of links to a file
 226  */
 227 #define EXT4_LINK_MAX           65000
 228
 229 /*
 230  * Macro-instructions used to manage several block sizes
 231  */
 232 #define EXT4_MIN_BLOCK_SIZE             1024
 233 #define EXT4_MAX_BLOCK_SIZE             65536
 234 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 235 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 236 #ifdef __KERNEL__
 237 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 238 #else
 239 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 240 #endif
 241 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 242 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 243                                          EXT4_SB(s)->s_cluster_bits)
 244 #ifdef __KERNEL__
 245 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 246 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 247 #else
 248 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 249 #endif
 250 #ifdef __KERNEL__
 251 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 252 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 253 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 254 #else
 255 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 256                                  EXT4_GOOD_OLD_INODE_SIZE : \
 257                                  (s)->s_inode_size)
 258 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 259                                  EXT4_GOOD_OLD_FIRST_INO : \
 260                                  (s)->s_first_ino)
 261 #endif
 262 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 263
 264 /* Translate a block number to a cluster number */
 265 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 266 /* Translate a cluster number to a block number */
 267 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 268 /* Translate # of blks to # of clusters */
 269 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 270                                  (sbi)->s_cluster_bits)
 271 /* Mask out the low bits to get the starting block of the cluster */
 272 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 273                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 274 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 275                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 276 /* Get the cluster offset */
 277 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 278                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 279 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 280                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 281
 282 /*
 283  * Structure of a blocks group descriptor
 284  */
 285 struct ext4_group_desc
 286 {
 287         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 288         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 289         __le32  bg_inode_table_lo;      /* Inodes table block */
 290         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 291         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 292         __le16  bg_used_dirs_count_lo;  /* Directories count */
 293         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 294         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 295         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 296         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 297         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 298         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 299         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 300         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 301         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 302         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 303         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 304         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 305         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 306         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 307         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 308         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 309         __u32   bg_reserved;
 310 };
 311
 312 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 313         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 314          sizeof(__le16))
 315 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 316         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 317          sizeof(__le16))
 318
 319 /*
 320  * Structure of a flex block group info
 321  */
 322
 323 struct flex_groups {
 324         atomic64_t      free_clusters;
 325         atomic_t        free_inodes;
 326         atomic_t        used_dirs;
 327 };
 328
 329 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 330 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 331 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 332
 333 /*
 334  * Macro-instructions used to manage group descriptors
 335  */
 336 #define EXT4_MIN_DESC_SIZE              32
 337 #define EXT4_MIN_DESC_SIZE_64BIT        64
 338 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 339 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 340 #ifdef __KERNEL__
 341 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 342 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 343 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 344 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 345 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 346 #else
 347 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 348 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 349 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 350 #endif
 351
 352 /*
 353  * Constants relative to the data blocks
 354  */
 355 #define EXT4_NDIR_BLOCKS                12
 356 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 357 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 358 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 359 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 360
 361 /*
 362  * Inode flags
 363  */
 364 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 365 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 366 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 367 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 368 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 369 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 370 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 371 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 372 /* Reserved for compression usage... */
 373 #define EXT4_DIRTY_FL                   0x00000100
 374 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 375 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 376         /* nb: was previously EXT2_ECOMPR_FL */
 377 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 378 /* End compression flags --- maybe not all used */
 379 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 380 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 381 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 382 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 383 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 384 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 385 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 386 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 387 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 388 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 389 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 390 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 391 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 392
 393 #define EXT4_FL_USER_VISIBLE            0x304BDFFF /* User visible flags */
 394 #define EXT4_FL_USER_MODIFIABLE         0x204380FF /* User modifiable flags */
 395
 396 #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
 397                                          EXT4_IMMUTABLE_FL | \
 398                                          EXT4_APPEND_FL | \
 399                                          EXT4_NODUMP_FL | \
 400                                          EXT4_NOATIME_FL | \
 401                                          EXT4_PROJINHERIT_FL)
 402
 403 /* Flags that should be inherited by new inodes from their parent. */
 404 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 405                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 406                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 407                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 408                            EXT4_PROJINHERIT_FL)
 409
 410 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 411 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 412
 413 /* Flags that are appropriate for non-directories/regular files. */
 414 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 415
 416 /* Mask out flags that are inappropriate for the given type of inode. */
 417 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 418 {
 419         if (S_ISDIR(mode))
 420                 return flags;
 421         else if (S_ISREG(mode))
 422                 return flags & EXT4_REG_FLMASK;
 423         else
 424                 return flags & EXT4_OTHER_FLMASK;
 425 }
 426
 427 /*
 428  * Inode flags used for atomic set/get
 429  */
 430 enum {
 431         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 432         EXT4_INODE_UNRM         = 1,    /* Undelete */
 433         EXT4_INODE_COMPR        = 2,    /* Compress file */
 434         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 435         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 436         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 437         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 438         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 439 /* Reserved for compression usage... */
 440         EXT4_INODE_DIRTY        = 8,
 441         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 442         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 443         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 444 /* End compression flags --- maybe not all used */
 445         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 446         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 447         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 448         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 449         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 450         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 451         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 452         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 453         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 454         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 455         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 456         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 457         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 458 };
 459
 460 /*
 461  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 462  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 463  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 464  * any extra space in the compiled kernel image, otherwise, the build will fail.
 465  * It's important that these values are the same, since we are using
 466  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 467  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 468  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 469  * defined in e2fsprogs.
 470  *
 471  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 472  */
 473 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 474 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 475
 476 static inline void ext4_check_flag_values(void)
 477 {
 478         CHECK_FLAG_VALUE(SECRM);
 479         CHECK_FLAG_VALUE(UNRM);
 480         CHECK_FLAG_VALUE(COMPR);
 481         CHECK_FLAG_VALUE(SYNC);
 482         CHECK_FLAG_VALUE(IMMUTABLE);
 483         CHECK_FLAG_VALUE(APPEND);
 484         CHECK_FLAG_VALUE(NODUMP);
 485         CHECK_FLAG_VALUE(NOATIME);
 486         CHECK_FLAG_VALUE(DIRTY);
 487         CHECK_FLAG_VALUE(COMPRBLK);
 488         CHECK_FLAG_VALUE(NOCOMPR);
 489         CHECK_FLAG_VALUE(ENCRYPT);
 490         CHECK_FLAG_VALUE(INDEX);
 491         CHECK_FLAG_VALUE(IMAGIC);
 492         CHECK_FLAG_VALUE(JOURNAL_DATA);
 493         CHECK_FLAG_VALUE(NOTAIL);
 494         CHECK_FLAG_VALUE(DIRSYNC);
 495         CHECK_FLAG_VALUE(TOPDIR);
 496         CHECK_FLAG_VALUE(HUGE_FILE);
 497         CHECK_FLAG_VALUE(EXTENTS);
 498         CHECK_FLAG_VALUE(EA_INODE);
 499         CHECK_FLAG_VALUE(EOFBLOCKS);
 500         CHECK_FLAG_VALUE(INLINE_DATA);
 501         CHECK_FLAG_VALUE(PROJINHERIT);
 502         CHECK_FLAG_VALUE(RESERVED);
 503 }
 504
 505 /* Used to pass group descriptor data when online resize is done */
 506 struct ext4_new_group_input {
 507         __u32 group;            /* Group number for this data */
 508         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 509         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 510         __u64 inode_table;      /* Absolute block number of inode table start */
 511         __u32 blocks_count;     /* Total number of blocks in this group */
 512         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 513         __u16 unused;
 514 };
 515
 516 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 517 struct compat_ext4_new_group_input {
 518         u32 group;
 519         compat_u64 block_bitmap;
 520         compat_u64 inode_bitmap;
 521         compat_u64 inode_table;
 522         u32 blocks_count;
 523         u16 reserved_blocks;
 524         u16 unused;
 525 };
 526 #endif
 527
 528 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 529 struct ext4_new_group_data {
 530         __u32 group;
 531         __u64 block_bitmap;
 532         __u64 inode_bitmap;
 533         __u64 inode_table;
 534         __u32 blocks_count;
 535         __u16 reserved_blocks;
 536         __u16 unused;
 537         __u32 free_blocks_count;
 538 };
 539
 540 /* Indexes used to index group tables in ext4_new_group_data */
 541 enum {
 542         BLOCK_BITMAP = 0,       /* block bitmap */
 543         INODE_BITMAP,           /* inode bitmap */
 544         INODE_TABLE,            /* inode tables */
 545         GROUP_TABLE_COUNT,
 546 };
 547
 548 /*
 549  * Flags used by ext4_map_blocks()
 550  */
 551         /* Allocate any needed blocks and/or convert an unwritten
 552            extent to be an initialized ext4 */
 553 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 554         /* Request the creation of an unwritten extent */
 555 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 556 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 557                                                  EXT4_GET_BLOCKS_CREATE)
 558         /* Caller is from the delayed allocation writeout path
 559          * finally doing the actual allocation of delayed blocks */
 560 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 561         /* caller is from the direct IO path, request to creation of an
 562         unwritten extents if not allocated, split the unwritten
 563         extent if blocks has been preallocated already*/
 564 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 565 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 566 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 567                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 568         /* Convert extent to initialized after IO complete */
 569 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 570                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 571         /* Eventual metadata allocation (due to growing extent tree)
 572          * should not fail, so try to use reserved blocks for that.*/
 573 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 574         /* Don't normalize allocation size (used for fallocate) */
 575 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 576         /* Request will not result in inode size update (user for fallocate) */
 577 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 578         /* Convert written extents to unwritten */
 579 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 580         /* Write zeros to newly created written extents */
 581 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 582 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 583                                         EXT4_GET_BLOCKS_ZERO)
 584
 585 /*
 586  * The bit position of these flags must not overlap with any of the
 587  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 588  * read_extent_tree_block(), ext4_split_extent_at(),
 589  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 590  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 591  * caching the extents when reading from the extent tree while a
 592  * truncate or punch hole operation is in progress.
 593  */
 594 #define EXT4_EX_NOCACHE                         0x40000000
 595 #define EXT4_EX_FORCE_CACHE                     0x20000000
 596
 597 /*
 598  * Flags used by ext4_free_blocks
 599  */
 600 #define EXT4_FREE_BLOCKS_METADATA       0x0001
 601 #define EXT4_FREE_BLOCKS_FORGET         0x0002
 602 #define EXT4_FREE_BLOCKS_VALIDATED      0x0004
 603 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
 604 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 605 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 606
 607 /* Encryption algorithms */
 608 #define EXT4_ENCRYPTION_MODE_INVALID            0
 609 #define EXT4_ENCRYPTION_MODE_AES_256_XTS        1
 610 #define EXT4_ENCRYPTION_MODE_AES_256_GCM        2
 611 #define EXT4_ENCRYPTION_MODE_AES_256_CBC        3
 612 #define EXT4_ENCRYPTION_MODE_AES_256_CTS        4
 613
 614 #include "ext4_crypto.h"
 615
 616 /*
 617  * ioctl commands
 618  */
 619 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 620 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 621 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 622 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 623 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 624 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 625 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 626 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 627 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 628 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 629 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 630  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 631  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 632 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 633 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 634 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 635 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 636 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 637 #define EXT4_IOC_SET_ENCRYPTION_POLICY  _IOR('f', 19, struct ext4_encryption_policy)
 638 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  _IOW('f', 20, __u8[16])
 639 #define EXT4_IOC_GET_ENCRYPTION_POLICY  _IOW('f', 21, struct ext4_encryption_policy)
 640
 641 #ifndef FS_IOC_FSGETXATTR
 642 /* Until the uapi changes get merged for project quota... */
 643
 644 #define FS_IOC_FSGETXATTR               _IOR('X', 31, struct fsxattr)
 645 #define FS_IOC_FSSETXATTR               _IOW('X', 32, struct fsxattr)
 646
 647 /*
 648  * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
 649  */
 650 struct fsxattr {
 651         __u32           fsx_xflags;     /* xflags field value (get/set) */
 652         __u32           fsx_extsize;    /* extsize field value (get/set)*/
 653         __u32           fsx_nextents;   /* nextents field value (get)   */
 654         __u32           fsx_projid;     /* project identifier (get/set) */
 655         unsigned char   fsx_pad[12];
 656 };
 657
 658 /*
 659  * Flags for the fsx_xflags field
 660  */
 661 #define FS_XFLAG_REALTIME       0x00000001      /* data in realtime volume */
 662 #define FS_XFLAG_PREALLOC       0x00000002      /* preallocated file extents */
 663 #define FS_XFLAG_IMMUTABLE      0x00000008      /* file cannot be modified */
 664 #define FS_XFLAG_APPEND         0x00000010      /* all writes append */
 665 #define FS_XFLAG_SYNC           0x00000020      /* all writes synchronous */
 666 #define FS_XFLAG_NOATIME        0x00000040      /* do not update access time */
 667 #define FS_XFLAG_NODUMP         0x00000080      /* do not include in backups */
 668 #define FS_XFLAG_RTINHERIT      0x00000100      /* create with rt bit set */
 669 #define FS_XFLAG_PROJINHERIT    0x00000200      /* create with parents projid */
 670 #define FS_XFLAG_NOSYMLINKS     0x00000400      /* disallow symlink creation */
 671 #define FS_XFLAG_EXTSIZE        0x00000800      /* extent size allocator hint */
 672 #define FS_XFLAG_EXTSZINHERIT   0x00001000      /* inherit inode extent size */
 673 #define FS_XFLAG_NODEFRAG       0x00002000      /* do not defragment */
 674 #define FS_XFLAG_FILESTREAM     0x00004000      /* use filestream allocator */
 675 #define FS_XFLAG_HASATTR        0x80000000      /* no DIFLAG for this */
 676 #endif /* !defined(FS_IOC_FSGETXATTR) */
 677
 678 #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
 679 #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
 680
 681 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 682 /*
 683  * ioctl commands in 32 bit emulation
 684  */
 685 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 686 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 687 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 688 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 689 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 690 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 691 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 692 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 693 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 694 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 695 #endif
 696
 697 /* Max physical block we can address w/o extents */
 698 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 699
 700 /*
 701  * Structure of an inode on the disk
 702  */
 703 struct ext4_inode {
 704         __le16  i_mode;         /* File mode */
 705         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 706         __le32  i_size_lo;      /* Size in bytes */
 707         __le32  i_atime;        /* Access time */
 708         __le32  i_ctime;        /* Inode Change time */
 709         __le32  i_mtime;        /* Modification time */
 710         __le32  i_dtime;        /* Deletion Time */
 711         __le16  i_gid;          /* Low 16 bits of Group Id */
 712         __le16  i_links_count;  /* Links count */
 713         __le32  i_blocks_lo;    /* Blocks count */
 714         __le32  i_flags;        /* File flags */
 715         union {
 716                 struct {
 717                         __le32  l_i_version;
 718                 } linux1;
 719                 struct {
 720                         __u32  h_i_translator;
 721                 } hurd1;
 722                 struct {
 723                         __u32  m_i_reserved1;
 724                 } masix1;
 725         } osd1;                         /* OS dependent 1 */
 726         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 727         __le32  i_generation;   /* File version (for NFS) */
 728         __le32  i_file_acl_lo;  /* File ACL */
 729         __le32  i_size_high;
 730         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 731         union {
 732                 struct {
 733                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 734                         __le16  l_i_file_acl_high;
 735                         __le16  l_i_uid_high;   /* these 2 fields */
 736                         __le16  l_i_gid_high;   /* were reserved2[0] */
 737                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 738                         __le16  l_i_reserved;
 739                 } linux2;
 740                 struct {
 741                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 742                         __u16   h_i_mode_high;
 743                         __u16   h_i_uid_high;
 744                         __u16   h_i_gid_high;
 745                         __u32   h_i_author;
 746                 } hurd2;
 747                 struct {
 748                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 749                         __le16  m_i_file_acl_high;
 750                         __u32   m_i_reserved2[2];
 751                 } masix2;
 752         } osd2;                         /* OS dependent 2 */
 753         __le16  i_extra_isize;
 754         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 755         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 756         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 757         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 758         __le32  i_crtime;       /* File Creation time */
 759         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 760         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 761         __le32  i_projid;       /* Project ID */
 762 };
 763
 764 struct move_extent {
 765         __u32 reserved;         /* should be zero */
 766         __u32 donor_fd;         /* donor file descriptor */
 767         __u64 orig_start;       /* logical start offset in block for orig */
 768         __u64 donor_start;      /* logical start offset in block for donor */
 769         __u64 len;              /* block length to be moved */
 770         __u64 moved_len;        /* moved block length */
 771 };
 772
 773 #define EXT4_EPOCH_BITS 2
 774 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 775 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 776
 777 /*
 778  * Extended fields will fit into an inode if the filesystem was formatted
 779  * with large inodes (-I 256 or larger) and there are not currently any EAs
 780  * consuming all of the available space. For new inodes we always reserve
 781  * enough space for the kernel's known extended fields, but for inodes
 782  * created with an old kernel this might not have been the case. None of
 783  * the extended inode fields is critical for correct filesystem operation.
 784  * This macro checks if a certain field fits in the inode. Note that
 785  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 786  */
 787 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 788         ((offsetof(typeof(*ext4_inode), field) +        \
 789           sizeof((ext4_inode)->field))                  \
 790         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 791             (einode)->i_extra_isize))                   \
 792
 793 /*
 794  * We use an encoding that preserves the times for extra epoch "00":
 795  *
 796  * extra  msb of                         adjust for signed
 797  * epoch  32-bit                         32-bit tv_sec to
 798  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 799  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 800  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 801  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 802  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 803  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 804  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 805  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 806  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 807  *
 808  * Note that previous versions of the kernel on 64-bit systems would
 809  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 810  * 1970.  e2fsck will correct this, assuming that it is run on the
 811  * affected filesystem before 2242.
 812  */
 813
 814 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 815 {
 816         u32 extra = sizeof(time->tv_sec) > 4 ?
 817                 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
 818         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 819 }
 820
 821 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 822 {
 823         if (unlikely(sizeof(time->tv_sec) > 4 &&
 824                         (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
 825 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
 826                 /* Handle legacy encoding of pre-1970 dates with epoch
 827                  * bits 1,1.  We assume that by kernel version 4.20,
 828                  * everyone will have run fsck over the affected
 829                  * filesystems to correct the problem.  (This
 830                  * backwards compatibility may be removed before this
 831                  * time, at the discretion of the ext4 developers.)
 832                  */
 833                 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
 834                 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
 835                         extra_bits = 0;
 836                 time->tv_sec += extra_bits << 32;
 837 #else
 838                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 839 #endif
 840         }
 841         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 842 }
 843
 844 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 845 do {                                                                           \
 846         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 847         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 848                 (raw_inode)->xtime ## _extra =                                 \
 849                                 ext4_encode_extra_time(&(inode)->xtime);       \
 850 } while (0)
 851
 852 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 853 do {                                                                           \
 854         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 855                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 856         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 857                 (raw_inode)->xtime ## _extra =                                 \
 858                                 ext4_encode_extra_time(&(einode)->xtime);      \
 859 } while (0)
 860
 861 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 862 do {                                                                           \
 863         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 864         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 865                 ext4_decode_extra_time(&(inode)->xtime,                        \
 866                                        raw_inode->xtime ## _extra);            \
 867         else                                                                   \
 868                 (inode)->xtime.tv_nsec = 0;                                    \
 869 } while (0)
 870
 871 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 872 do {                                                                           \
 873         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 874                 (einode)->xtime.tv_sec =                                       \
 875                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 876         else                                                                   \
 877                 (einode)->xtime.tv_sec = 0;                                    \
 878         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 879                 ext4_decode_extra_time(&(einode)->xtime,                       \
 880                                        raw_inode->xtime ## _extra);            \
 881         else                                                                   \
 882                 (einode)->xtime.tv_nsec = 0;                                   \
 883 } while (0)
 884
 885 #define i_disk_version osd1.linux1.l_i_version
 886
 887 #if defined(__KERNEL__) || defined(__linux__)
 888 #define i_reserved1     osd1.linux1.l_i_reserved1
 889 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 890 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 891 #define i_uid_low       i_uid
 892 #define i_gid_low       i_gid
 893 #define i_uid_high      osd2.linux2.l_i_uid_high
 894 #define i_gid_high      osd2.linux2.l_i_gid_high
 895 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 896
 897 #elif defined(__GNU__)
 898
 899 #define i_translator    osd1.hurd1.h_i_translator
 900 #define i_uid_high      osd2.hurd2.h_i_uid_high
 901 #define i_gid_high      osd2.hurd2.h_i_gid_high
 902 #define i_author        osd2.hurd2.h_i_author
 903
 904 #elif defined(__masix__)
 905
 906 #define i_reserved1     osd1.masix1.m_i_reserved1
 907 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 908 #define i_reserved2     osd2.masix2.m_i_reserved2
 909
 910 #endif /* defined(__KERNEL__) || defined(__linux__) */
 911
 912 #include "extents_status.h"
 913
 914 /*
 915  * fourth extended file system inode data in memory
 916  */
 917 struct ext4_inode_info {
 918         __le32  i_data[15];     /* unconverted */
 919         __u32   i_dtime;
 920         ext4_fsblk_t    i_file_acl;
 921
 922         /*
 923          * i_block_group is the number of the block group which contains
 924          * this file's inode.  Constant across the lifetime of the inode,
 925          * it is ued for making block allocation decisions - we try to
 926          * place a file's data blocks near its inode block, and new inodes
 927          * near to their parent directory's inode.
 928          */
 929         ext4_group_t    i_block_group;
 930         ext4_lblk_t     i_dir_start_lookup;
 931 #if (BITS_PER_LONG < 64)
 932         unsigned long   i_state_flags;          /* Dynamic state flags */
 933 #endif
 934         unsigned long   i_flags;
 935
 936         /*
 937          * Extended attributes can be read independently of the main file
 938          * data. Taking i_mutex even when reading would cause contention
 939          * between readers of EAs and writers of regular file data, so
 940          * instead we synchronize on xattr_sem when reading or changing
 941          * EAs.
 942          */
 943         struct rw_semaphore xattr_sem;
 944
 945         struct list_head i_orphan;      /* unlinked but open inodes */
 946
 947         /*
 948          * i_disksize keeps track of what the inode size is ON DISK, not
 949          * in memory.  During truncate, i_size is set to the new size by
 950          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 951          * set i_disksize to 0 until the truncate is actually under way.
 952          *
 953          * The intent is that i_disksize always represents the blocks which
 954          * are used by this file.  This allows recovery to restart truncate
 955          * on orphans if we crash during truncate.  We actually write i_disksize
 956          * into the on-disk inode when writing inodes out, instead of i_size.
 957          *
 958          * The only time when i_disksize and i_size may be different is when
 959          * a truncate is in progress.  The only things which change i_disksize
 960          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 961          */
 962         loff_t  i_disksize;
 963
 964         /*
 965          * i_data_sem is for serialising ext4_truncate() against
 966          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 967          * data tree are chopped off during truncate. We can't do that in
 968          * ext4 because whenever we perform intermediate commits during
 969          * truncate, the inode and all the metadata blocks *must* be in a
 970          * consistent state which allows truncation of the orphans to restart
 971          * during recovery.  Hence we must fix the get_block-vs-truncate race
 972          * by other means, so we have i_data_sem.
 973          */
 974         struct rw_semaphore i_data_sem;
 975         /*
 976          * i_mmap_sem is for serializing page faults with truncate / punch hole
 977          * operations. We have to make sure that new page cannot be faulted in
 978          * a section of the inode that is being punched. We cannot easily use
 979          * i_data_sem for this since we need protection for the whole punch
 980          * operation and i_data_sem ranks below transaction start so we have
 981          * to occasionally drop it.
 982          */
 983         struct rw_semaphore i_mmap_sem;
 984         struct inode vfs_inode;
 985         struct jbd2_inode *jinode;
 986
 987         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
 988
 989         /*
 990          * File creation time. Its function is same as that of
 991          * struct timespec i_{a,c,m}time in the generic inode.
 992          */
 993         struct timespec i_crtime;
 994
 995         /* mballoc */
 996         struct list_head i_prealloc_list;
 997         spinlock_t i_prealloc_lock;
 998
 999         /* extents status tree */
1000         struct ext4_es_tree i_es_tree;
1001         rwlock_t i_es_lock;
1002         struct list_head i_es_list;
1003         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1004         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1005         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1006                                            extents to shrink. Protected by
1007                                            i_es_lock  */
1008
1009         /* ialloc */
1010         ext4_group_t    i_last_alloc_group;
1011
1012         /* allocation reservation info for delalloc */
1013         /* In case of bigalloc, these refer to clusters rather than blocks */
1014         unsigned int i_reserved_data_blocks;
1015         unsigned int i_reserved_meta_blocks;
1016         unsigned int i_allocated_meta_blocks;
1017         ext4_lblk_t i_da_metadata_calc_last_lblock;
1018         int i_da_metadata_calc_len;
1019
1020         /* on-disk additional length */
1021         __u16 i_extra_isize;
1022
1023         /* Indicate the inline data space. */
1024         u16 i_inline_off;
1025         u16 i_inline_size;
1026
1027 #ifdef CONFIG_QUOTA
1028         /* quota space reservation, managed internally by quota code */
1029         qsize_t i_reserved_quota;
1030 #endif
1031
1032         /* Lock protecting lists below */
1033         spinlock_t i_completed_io_lock;
1034         /*
1035          * Completed IOs that need unwritten extents handling and have
1036          * transaction reserved
1037          */
1038         struct list_head i_rsv_conversion_list;
1039         struct work_struct i_rsv_conversion_work;
1040         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1041
1042         spinlock_t i_block_reservation_lock;
1043
1044         /*
1045          * Transactions that contain inode's metadata needed to complete
1046          * fsync and fdatasync, respectively.
1047          */
1048         tid_t i_sync_tid;
1049         tid_t i_datasync_tid;
1050
1051 #ifdef CONFIG_QUOTA
1052         struct dquot *i_dquot[MAXQUOTAS];
1053 #endif
1054
1055         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1056         __u32 i_csum_seed;
1057
1058 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1059         /* Encryption params */
1060         struct ext4_crypt_info *i_crypt_info;
1061 #endif
1062         kprojid_t i_projid;
1063 };
1064
1065 /*
1066  * File system states
1067  */
1068 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1069 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1070 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1071
1072 /*
1073  * Misc. filesystem flags
1074  */
1075 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1076 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1077 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1078
1079 /*
1080  * Mount flags set via mount options or defaults
1081  */
1082 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1083 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1084 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1085 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1086 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1087 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1088 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1089 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1090 #ifdef CONFIG_FS_DAX
1091 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
1092 #else
1093 #define EXT4_MOUNT_DAX                  0
1094 #endif
1095 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1096 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1097 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1098 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1099 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1100 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1101 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1102 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1103 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1104 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1105 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
1106 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
1107 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
1108 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1109 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1110 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1111 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1112 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1113 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1114 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1115 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1116
1117 /*
1118  * Mount flags set either automatically (could not be set by mount option)
1119  * based on per file system feature or property or in special cases such as
1120  * distinguishing between explicit mount option definition and default.
1121  */
1122 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1123                                                       specified delalloc */
1124 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1125                                                       size of blocksize * 8
1126                                                       blocks */
1127 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1128                                                       file systems */
1129
1130 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1131                                                 specified journal checksum */
1132
1133 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1134                                                 ~EXT4_MOUNT_##opt
1135 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1136                                                 EXT4_MOUNT_##opt
1137 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1138                                          EXT4_MOUNT_##opt)
1139
1140 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1141                                                 ~EXT4_MOUNT2_##opt
1142 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1143                                                 EXT4_MOUNT2_##opt
1144 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1145                                          EXT4_MOUNT2_##opt)
1146
1147 #define ext4_test_and_set_bit           __test_and_set_bit_le
1148 #define ext4_set_bit                    __set_bit_le
1149 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1150 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1151 #define ext4_clear_bit                  __clear_bit_le
1152 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1153 #define ext4_test_bit                   test_bit_le
1154 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1155 #define ext4_find_next_bit              find_next_bit_le
1156
1157 extern void ext4_set_bits(void *bm, int cur, int len);
1158
1159 /*
1160  * Maximal mount counts between two filesystem checks
1161  */
1162 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1163 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1164
1165 /*
1166  * Behaviour when detecting errors
1167  */
1168 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1169 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1170 #define EXT4_ERRORS_PANIC               3       /* Panic */
1171 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1172
1173 /* Metadata checksum algorithm codes */
1174 #define EXT4_CRC32C_CHKSUM              1
1175
1176 /*
1177  * Structure of the super block
1178  */
1179 struct ext4_super_block {
1180 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1181         __le32  s_blocks_count_lo;      /* Blocks count */
1182         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1183         __le32  s_free_blocks_count_lo; /* Free blocks count */
1184 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1185         __le32  s_first_data_block;     /* First Data Block */
1186         __le32  s_log_block_size;       /* Block size */
1187         __le32  s_log_cluster_size;     /* Allocation cluster size */
1188 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1189         __le32  s_clusters_per_group;   /* # Clusters per group */
1190         __le32  s_inodes_per_group;     /* # Inodes per group */
1191         __le32  s_mtime;                /* Mount time */
1192 /*30*/  __le32  s_wtime;                /* Write time */
1193         __le16  s_mnt_count;            /* Mount count */
1194         __le16  s_max_mnt_count;        /* Maximal mount count */
1195         __le16  s_magic;                /* Magic signature */
1196         __le16  s_state;                /* File system state */
1197         __le16  s_errors;               /* Behaviour when detecting errors */
1198         __le16  s_minor_rev_level;      /* minor revision level */
1199 /*40*/  __le32  s_lastcheck;            /* time of last check */
1200         __le32  s_checkinterval;        /* max. time between checks */
1201         __le32  s_creator_os;           /* OS */
1202         __le32  s_rev_level;            /* Revision level */
1203 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1204         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1205         /*
1206          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1207          *
1208          * Note: the difference between the compatible feature set and
1209          * the incompatible feature set is that if there is a bit set
1210          * in the incompatible feature set that the kernel doesn't
1211          * know about, it should refuse to mount the filesystem.
1212          *
1213          * e2fsck's requirements are more strict; if it doesn't know
1214          * about a feature in either the compatible or incompatible
1215          * feature set, it must abort and not try to meddle with
1216          * things it doesn't understand...
1217          */
1218         __le32  s_first_ino;            /* First non-reserved inode */
1219         __le16  s_inode_size;           /* size of inode structure */
1220         __le16  s_block_group_nr;       /* block group # of this superblock */
1221         __le32  s_feature_compat;       /* compatible feature set */
1222 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1223         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1224 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1225 /*78*/  char    s_volume_name[16];      /* volume name */
1226 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
1227 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1228         /*
1229          * Performance hints.  Directory preallocation should only
1230          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1231          */
1232         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1233         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1234         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1235         /*
1236          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1237          */
1238 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1239 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1240         __le32  s_journal_dev;          /* device number of journal file */
1241         __le32  s_last_orphan;          /* start of list of inodes to delete */
1242         __le32  s_hash_seed[4];         /* HTREE hash seed */
1243         __u8    s_def_hash_version;     /* Default hash version to use */
1244         __u8    s_jnl_backup_type;
1245         __le16  s_desc_size;            /* size of group descriptor */
1246 /*100*/ __le32  s_default_mount_opts;
1247         __le32  s_first_meta_bg;        /* First metablock block group */
1248         __le32  s_mkfs_time;            /* When the filesystem was created */
1249         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1250         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1251 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1252         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1253         __le32  s_free_blocks_count_hi; /* Free blocks count */
1254         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1255         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1256         __le32  s_flags;                /* Miscellaneous flags */
1257         __le16  s_raid_stride;          /* RAID stride */
1258         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1259         __le64  s_mmp_block;            /* Block for multi-mount protection */
1260         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1261         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1262         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1263         __u8    s_encryption_level;     /* versioning level for encryption */
1264         __u8    s_reserved_pad;         /* Padding to next 32bits */
1265         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1266         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1267         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1268         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1269                                               snapshot's future use */
1270         __le32  s_snapshot_list;        /* inode number of the head of the
1271                                            on-disk snapshot list */
1272 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1273         __le32  s_error_count;          /* number of fs errors */
1274         __le32  s_first_error_time;     /* first time an error happened */
1275         __le32  s_first_error_ino;      /* inode involved in first error */
1276         __le64  s_first_error_block;    /* block involved of first error */
1277         __u8    s_first_error_func[32]; /* function where the error happened */
1278         __le32  s_first_error_line;     /* line number where error happened */
1279         __le32  s_last_error_time;      /* most recent time of an error */
1280         __le32  s_last_error_ino;       /* inode involved in last error */
1281         __le32  s_last_error_line;      /* line number where error happened */
1282         __le64  s_last_error_block;     /* block involved of last error */
1283         __u8    s_last_error_func[32];  /* function where the error happened */
1284 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1285         __u8    s_mount_opts[64];
1286         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1287         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1288         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1289         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1290         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1291         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1292         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1293         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1294         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1295         __le32  s_reserved[98];         /* Padding to the end of the block */
1296         __le32  s_checksum;             /* crc32c(superblock) */
1297 };
1298
1299 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1300
1301 #ifdef __KERNEL__
1302
1303 /*
1304  * run-time mount flags
1305  */
1306 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1307 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1308 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1309
1310 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1311 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1312                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1313 #else
1314 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1315 #endif
1316
1317 /* Number of quota types we support */
1318 #define EXT4_MAXQUOTAS 3
1319
1320 /*
1321  * fourth extended-fs super-block data in memory
1322  */
1323 struct ext4_sb_info {
1324         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1325         unsigned long s_inodes_per_block;/* Number of inodes per block */
1326         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1327         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1328         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1329         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1330         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1331         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1332         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1333         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1334         unsigned long s_overhead;  /* # of fs overhead clusters */
1335         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1336         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1337         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1338         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1339         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1340         struct buffer_head **s_group_desc;
1341         unsigned int s_mount_opt;
1342         unsigned int s_mount_opt2;
1343         unsigned int s_mount_flags;
1344         unsigned int s_def_mount_opt;
1345         ext4_fsblk_t s_sb_block;
1346         atomic64_t s_resv_clusters;
1347         kuid_t s_resuid;
1348         kgid_t s_resgid;
1349         unsigned short s_mount_state;
1350         unsigned short s_pad;
1351         int s_addr_per_block_bits;
1352         int s_desc_per_block_bits;
1353         int s_inode_size;
1354         int s_first_ino;
1355         unsigned int s_inode_readahead_blks;
1356         unsigned int s_inode_goal;
1357         spinlock_t s_next_gen_lock;
1358         u32 s_next_generation;
1359         u32 s_hash_seed[4];
1360         int s_def_hash_version;
1361         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1362         struct percpu_counter s_freeclusters_counter;
1363         struct percpu_counter s_freeinodes_counter;
1364         struct percpu_counter s_dirs_counter;
1365         struct percpu_counter s_dirtyclusters_counter;
1366         struct blockgroup_lock *s_blockgroup_lock;
1367         struct proc_dir_entry *s_proc;
1368         struct kobject s_kobj;
1369         struct completion s_kobj_unregister;
1370         struct super_block *s_sb;
1371
1372         /* Journaling */
1373         struct journal_s *s_journal;
1374         struct list_head s_orphan;
1375         struct mutex s_orphan_lock;
1376         unsigned long s_resize_flags;           /* Flags indicating if there
1377                                                    is a resizer */
1378         unsigned long s_commit_interval;
1379         u32 s_max_batch_time;
1380         u32 s_min_batch_time;
1381         struct block_device *journal_bdev;
1382 #ifdef CONFIG_QUOTA
1383         char *s_qf_names[EXT4_MAXQUOTAS];       /* Names of quota files with journalled quota */
1384         int s_jquota_fmt;                       /* Format of quota to use */
1385 #endif
1386         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1387         struct rb_root system_blks;
1388
1389 #ifdef EXTENTS_STATS
1390         /* ext4 extents stats */
1391         unsigned long s_ext_min;
1392         unsigned long s_ext_max;
1393         unsigned long s_depth_max;
1394         spinlock_t s_ext_stats_lock;
1395         unsigned long s_ext_blocks;
1396         unsigned long s_ext_extents;
1397 #endif
1398
1399         /* for buddy allocator */
1400         struct ext4_group_info ***s_group_info;
1401         struct inode *s_buddy_cache;
1402         spinlock_t s_md_lock;
1403         unsigned short *s_mb_offsets;
1404         unsigned int *s_mb_maxs;
1405         unsigned int s_group_info_size;
1406
1407         /* tunables */
1408         unsigned long s_stripe;
1409         unsigned int s_mb_stream_request;
1410         unsigned int s_mb_max_to_scan;
1411         unsigned int s_mb_min_to_scan;
1412         unsigned int s_mb_stats;
1413         unsigned int s_mb_order2_reqs;
1414         unsigned int s_mb_group_prealloc;
1415         unsigned int s_max_dir_size_kb;
1416         /* where last allocation was done - for stream allocation */
1417         unsigned long s_mb_last_group;
1418         unsigned long s_mb_last_start;
1419
1420         /* stats for buddy allocator */
1421         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1422         atomic_t s_bal_success; /* we found long enough chunks */
1423         atomic_t s_bal_allocated;       /* in blocks */
1424         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1425         atomic_t s_bal_goals;   /* goal hits */
1426         atomic_t s_bal_breaks;  /* too long searches */
1427         atomic_t s_bal_2orders; /* 2^order hits */
1428         spinlock_t s_bal_lock;
1429         unsigned long s_mb_buddies_generated;
1430         unsigned long long s_mb_generation_time;
1431         atomic_t s_mb_lost_chunks;
1432         atomic_t s_mb_preallocated;
1433         atomic_t s_mb_discarded;
1434         atomic_t s_lock_busy;
1435
1436         /* locality groups */
1437         struct ext4_locality_group __percpu *s_locality_groups;
1438
1439         /* for write statistics */
1440         unsigned long s_sectors_written_start;
1441         u64 s_kbytes_written;
1442
1443         /* the size of zero-out chunk */
1444         unsigned int s_extent_max_zeroout_kb;
1445
1446         unsigned int s_log_groups_per_flex;
1447         struct flex_groups *s_flex_groups;
1448         ext4_group_t s_flex_groups_allocated;
1449
1450         /* workqueue for reserved extent conversions (buffered io) */
1451         struct workqueue_struct *rsv_conversion_wq;
1452
1453         /* timer for periodic error stats printing */
1454         struct timer_list s_err_report;
1455
1456         /* Lazy inode table initialization info */
1457         struct ext4_li_request *s_li_request;
1458         /* Wait multiplier for lazy initialization thread */
1459         unsigned int s_li_wait_mult;
1460
1461         /* Kernel thread for multiple mount protection */
1462         struct task_struct *s_mmp_tsk;
1463
1464         /* record the last minlen when FITRIM is called. */
1465         atomic_t s_last_trim_minblks;
1466
1467         /* Reference to checksum algorithm driver via cryptoapi */
1468         struct crypto_shash *s_chksum_driver;
1469
1470         /* Precomputed FS UUID checksum for seeding other checksums */
1471         __u32 s_csum_seed;
1472
1473         /* Reclaim extents from extent status tree */
1474         struct shrinker s_es_shrinker;
1475         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1476         long s_es_nr_inode;
1477         struct ext4_es_stats s_es_stats;
1478         struct mb_cache *s_mb_cache;
1479         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1480
1481         /* Ratelimit ext4 messages. */
1482         struct ratelimit_state s_err_ratelimit_state;
1483         struct ratelimit_state s_warning_ratelimit_state;
1484         struct ratelimit_state s_msg_ratelimit_state;
1485 };
1486
1487 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1488 {
1489         return sb->s_fs_info;
1490 }
1491 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1492 {
1493         return container_of(inode, struct ext4_inode_info, vfs_inode);
1494 }
1495
1496 static inline struct timespec ext4_current_time(struct inode *inode)
1497 {
1498         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1499                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1500 }
1501
1502 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1503 {
1504         return ino == EXT4_ROOT_INO ||
1505                 ino == EXT4_USR_QUOTA_INO ||
1506                 ino == EXT4_GRP_QUOTA_INO ||
1507                 ino == EXT4_BOOT_LOADER_INO ||
1508                 ino == EXT4_JOURNAL_INO ||
1509                 ino == EXT4_RESIZE_INO ||
1510                 (ino >= EXT4_FIRST_INO(sb) &&
1511                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1512 }
1513
1514 /*
1515  * Inode dynamic state flags
1516  */
1517 enum {
1518         EXT4_STATE_JDATA,               /* journaled data exists */
1519         EXT4_STATE_NEW,                 /* inode is newly created */
1520         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1521         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1522         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1523         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1524         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1525         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1526         EXT4_STATE_DIOREAD_LOCK,        /* Disable support for dio read
1527                                            nolocking */
1528         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1529         EXT4_STATE_ORDERED_MODE,        /* data=ordered mode */
1530         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1531 };
1532
1533 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1534 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1535 {                                                                       \
1536         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1537 }                                                                       \
1538 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1539 {                                                                       \
1540         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1541 }                                                                       \
1542 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1543 {                                                                       \
1544         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1545 }
1546
1547 /* Add these declarations here only so that these functions can be
1548  * found by name.  Otherwise, they are very hard to locate. */
1549 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1550 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1551 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1552 EXT4_INODE_BIT_FNS(flag, flags, 0)
1553
1554 /* Add these declarations here only so that these functions can be
1555  * found by name.  Otherwise, they are very hard to locate. */
1556 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1557 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1558 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1559 #if (BITS_PER_LONG < 64)
1560 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1561
1562 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1563 {
1564         (ei)->i_state_flags = 0;
1565 }
1566 #else
1567 EXT4_INODE_BIT_FNS(state, flags, 32)
1568
1569 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1570 {
1571         /* We depend on the fact that callers will set i_flags */
1572 }
1573 #endif
1574 #else
1575 /* Assume that user mode programs are passing in an ext4fs superblock, not
1576  * a kernel struct super_block.  This will allow us to call the feature-test
1577  * macros from user land. */
1578 #define EXT4_SB(sb)     (sb)
1579 #endif
1580
1581 /*
1582  * Returns true if the inode is inode is encrypted
1583  */
1584 static inline int ext4_encrypted_inode(struct inode *inode)
1585 {
1586 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1587         return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1588 #else
1589         return 0;
1590 #endif
1591 }
1592
1593 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1594
1595 /*
1596  * Codes for operating systems
1597  */
1598 #define EXT4_OS_LINUX           0
1599 #define EXT4_OS_HURD            1
1600 #define EXT4_OS_MASIX           2
1601 #define EXT4_OS_FREEBSD         3
1602 #define EXT4_OS_LITES           4
1603
1604 /*
1605  * Revision levels
1606  */
1607 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1608 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1609
1610 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1611 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1612
1613 #define EXT4_GOOD_OLD_INODE_SIZE 128
1614
1615 /*
1616  * Feature set definitions
1617  */
1618
1619 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */
1620 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
1621         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1622 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
1623         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1624 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
1625         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1626 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
1627         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1628 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
1629         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1630 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
1631         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1632 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
1633         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1634 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
1635         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1636 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
1637         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1638
1639 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1640 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1641 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1642 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1643 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1644 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1645 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1646
1647 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1648 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1649 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1650 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1651 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1652 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1653 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1654 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1655 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1656 /*
1657  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1658  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1659  * all other data structures' checksums.  However, the METADATA_CSUM and
1660  * GDT_CSUM bits are mutually exclusive.
1661  */
1662 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1663 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1664 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
1665
1666 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1667 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1668 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1669 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1670 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1671 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1672 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1673 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1674 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1675 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1676 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1677 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
1678 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1679 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1680 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1681
1682 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1683 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1684 { \
1685         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1686                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1687 } \
1688 static inline void ext4_set_feature_##name(struct super_block *sb) \
1689 { \
1690         EXT4_SB(sb)->s_es->s_feature_compat |= \
1691                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1692 } \
1693 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1694 { \
1695         EXT4_SB(sb)->s_es->s_feature_compat &= \
1696                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1697 }
1698
1699 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1700 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1701 { \
1702         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1703                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1704 } \
1705 static inline void ext4_set_feature_##name(struct super_block *sb) \
1706 { \
1707         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1708                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1709 } \
1710 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1711 { \
1712         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1713                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1714 }
1715
1716 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1717 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1718 { \
1719         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1720                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1721 } \
1722 static inline void ext4_set_feature_##name(struct super_block *sb) \
1723 { \
1724         EXT4_SB(sb)->s_es->s_feature_incompat |= \
1725                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1726 } \
1727 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1728 { \
1729         EXT4_SB(sb)->s_es->s_feature_incompat &= \
1730                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1731 }
1732
1733 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
1734 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
1735 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
1736 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
1737 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
1738 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
1739 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
1740
1741 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
1742 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
1743 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
1744 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
1745 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
1746 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
1747 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
1748 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
1749 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
1750 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
1751 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
1752 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
1753
1754 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
1755 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
1756 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
1757 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
1758 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
1759 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
1760 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
1761 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
1762 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
1763 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
1764 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
1765 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
1766 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
1767 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
1768 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
1769
1770 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1771 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1772                                          EXT4_FEATURE_INCOMPAT_META_BG)
1773 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1774                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1775                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1776
1777 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1778 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1779                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1780                                          EXT4_FEATURE_INCOMPAT_META_BG)
1781 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1782                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1783                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1784
1785 #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1786 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1787                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1788                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1789                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1790                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1791                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1792                                          EXT4_FEATURE_INCOMPAT_MMP | \
1793                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1794                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1795                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1796 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1797                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1798                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1799                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1800                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1801                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1802                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1803                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1804                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1805                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
1806                                          EXT4_FEATURE_RO_COMPAT_PROJECT)
1807
1808 #define EXTN_FEATURE_FUNCS(ver) \
1809 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1810 { \
1811         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1812                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1813 } \
1814 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1815 { \
1816         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1817                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1818 } \
1819 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1820 { \
1821         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1822                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1823 }
1824
1825 EXTN_FEATURE_FUNCS(2)
1826 EXTN_FEATURE_FUNCS(3)
1827 EXTN_FEATURE_FUNCS(4)
1828
1829 static inline bool ext4_has_compat_features(struct super_block *sb)
1830 {
1831         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1832 }
1833 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1834 {
1835         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1836 }
1837 static inline bool ext4_has_incompat_features(struct super_block *sb)
1838 {
1839         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1840 }
1841
1842 /*
1843  * Default values for user and/or group using reserved blocks
1844  */
1845 #define EXT4_DEF_RESUID         0
1846 #define EXT4_DEF_RESGID         0
1847
1848 /*
1849  * Default project ID
1850  */
1851 #define EXT4_DEF_PROJID         0
1852
1853 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1854
1855 /*
1856  * Default mount options
1857  */
1858 #define EXT4_DEFM_DEBUG         0x0001
1859 #define EXT4_DEFM_BSDGROUPS     0x0002
1860 #define EXT4_DEFM_XATTR_USER    0x0004
1861 #define EXT4_DEFM_ACL           0x0008
1862 #define EXT4_DEFM_UID16         0x0010
1863 #define EXT4_DEFM_JMODE         0x0060
1864 #define EXT4_DEFM_JMODE_DATA    0x0020
1865 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1866 #define EXT4_DEFM_JMODE_WBACK   0x0060
1867 #define EXT4_DEFM_NOBARRIER     0x0100
1868 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1869 #define EXT4_DEFM_DISCARD       0x0400
1870 #define EXT4_DEFM_NODELALLOC    0x0800
1871
1872 /*
1873  * Default journal batch times
1874  */
1875 #define EXT4_DEF_MIN_BATCH_TIME 0
1876 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1877
1878 /*
1879  * Minimum number of groups in a flexgroup before we separate out
1880  * directories into the first block group of a flexgroup
1881  */
1882 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1883
1884 /*
1885  * Structure of a directory entry
1886  */
1887 #define EXT4_NAME_LEN 255
1888
1889 struct ext4_dir_entry {
1890         __le32  inode;                  /* Inode number */
1891         __le16  rec_len;                /* Directory entry length */
1892         __le16  name_len;               /* Name length */
1893         char    name[EXT4_NAME_LEN];    /* File name */
1894 };
1895
1896 /*
1897  * The new version of the directory entry.  Since EXT4 structures are
1898  * stored in intel byte order, and the name_len field could never be
1899  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1900  * file_type field.
1901  */
1902 struct ext4_dir_entry_2 {
1903         __le32  inode;                  /* Inode number */
1904         __le16  rec_len;                /* Directory entry length */
1905         __u8    name_len;               /* Name length */
1906         __u8    file_type;
1907         char    name[EXT4_NAME_LEN];    /* File name */
1908 };
1909
1910 /*
1911  * This is a bogus directory entry at the end of each leaf block that
1912  * records checksums.
1913  */
1914 struct ext4_dir_entry_tail {
1915         __le32  det_reserved_zero1;     /* Pretend to be unused */
1916         __le16  det_rec_len;            /* 12 */
1917         __u8    det_reserved_zero2;     /* Zero name length */
1918         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1919         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1920 };
1921
1922 #define EXT4_DIRENT_TAIL(block, blocksize) \
1923         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1924                                         ((blocksize) - \
1925                                          sizeof(struct ext4_dir_entry_tail))))
1926
1927 /*
1928  * Ext4 directory file types.  Only the low 3 bits are used.  The
1929  * other bits are reserved for now.
1930  */
1931 #define EXT4_FT_UNKNOWN         0
1932 #define EXT4_FT_REG_FILE        1
1933 #define EXT4_FT_DIR             2
1934 #define EXT4_FT_CHRDEV          3
1935 #define EXT4_FT_BLKDEV          4
1936 #define EXT4_FT_FIFO            5
1937 #define EXT4_FT_SOCK            6
1938 #define EXT4_FT_SYMLINK         7
1939
1940 #define EXT4_FT_MAX             8
1941
1942 #define EXT4_FT_DIR_CSUM        0xDE
1943
1944 /*
1945  * EXT4_DIR_PAD defines the directory entries boundaries
1946  *
1947  * NOTE: It must be a multiple of 4
1948  */
1949 #define EXT4_DIR_PAD                    4
1950 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1951 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1952                                          ~EXT4_DIR_ROUND)
1953 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1954
1955 /*
1956  * If we ever get support for fs block sizes > page_size, we'll need
1957  * to remove the #if statements in the next two functions...
1958  */
1959 static inline unsigned int
1960 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1961 {
1962         unsigned len = le16_to_cpu(dlen);
1963
1964 #if (PAGE_CACHE_SIZE >= 65536)
1965         if (len == EXT4_MAX_REC_LEN || len == 0)
1966                 return blocksize;
1967         return (len & 65532) | ((len & 3) << 16);
1968 #else
1969         return len;
1970 #endif
1971 }
1972
1973 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1974 {
1975         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1976                 BUG();
1977 #if (PAGE_CACHE_SIZE >= 65536)
1978         if (len < 65536)
1979                 return cpu_to_le16(len);
1980         if (len == blocksize) {
1981                 if (blocksize == 65536)
1982                         return cpu_to_le16(EXT4_MAX_REC_LEN);
1983                 else
1984                         return cpu_to_le16(0);
1985         }
1986         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1987 #else
1988         return cpu_to_le16(len);
1989 #endif
1990 }
1991
1992 /*
1993  * Hash Tree Directory indexing
1994  * (c) Daniel Phillips, 2001
1995  */
1996
1997 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
1998                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1999 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2000 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2001
2002 /* Legal values for the dx_root hash_version field: */
2003
2004 #define DX_HASH_LEGACY          0
2005 #define DX_HASH_HALF_MD4        1
2006 #define DX_HASH_TEA             2
2007 #define DX_HASH_LEGACY_UNSIGNED 3
2008 #define DX_HASH_HALF_MD4_UNSIGNED       4
2009 #define DX_HASH_TEA_UNSIGNED            5
2010
2011 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2012                               const void *address, unsigned int length)
2013 {
2014         struct {
2015                 struct shash_desc shash;
2016                 char ctx[4];
2017         } desc;
2018         int err;
2019
2020         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2021
2022         desc.shash.tfm = sbi->s_chksum_driver;
2023         desc.shash.flags = 0;
2024         *(u32 *)desc.ctx = crc;
2025
2026         err = crypto_shash_update(&desc.shash, address, length);
2027         BUG_ON(err);
2028
2029         return *(u32 *)desc.ctx;
2030 }
2031
2032 #ifdef __KERNEL__
2033
2034 /* hash info structure used by the directory hash */
2035 struct dx_hash_info
2036 {
2037         u32             hash;
2038         u32             minor_hash;
2039         int             hash_version;
2040         u32             *seed;
2041 };
2042
2043
2044 /* 32 and 64 bit signed EOF for dx directories */
2045 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2046 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2047
2048
2049 /*
2050  * Control parameters used by ext4_htree_next_block
2051  */
2052 #define HASH_NB_ALWAYS          1
2053
2054 struct ext4_filename {
2055         const struct qstr *usr_fname;
2056         struct ext4_str disk_name;
2057         struct dx_hash_info hinfo;
2058 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2059         struct ext4_str crypto_buf;
2060 #endif
2061 };
2062
2063 #define fname_name(p) ((p)->disk_name.name)
2064 #define fname_len(p)  ((p)->disk_name.len)
2065
2066 /*
2067  * Describe an inode's exact location on disk and in memory
2068  */
2069 struct ext4_iloc
2070 {
2071         struct buffer_head *bh;
2072         unsigned long offset;
2073         ext4_group_t block_group;
2074 };
2075
2076 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2077 {
2078         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2079 }
2080
2081 /*
2082  * This structure is stuffed into the struct file's private_data field
2083  * for directories.  It is where we put information so that we can do
2084  * readdir operations in hash tree order.
2085  */
2086 struct dir_private_info {
2087         struct rb_root  root;
2088         struct rb_node  *curr_node;
2089         struct fname    *extra_fname;
2090         loff_t          last_pos;
2091         __u32           curr_hash;
2092         __u32           curr_minor_hash;
2093         __u32           next_hash;
2094 };
2095
2096 /* calculate the first block number of the group */
2097 static inline ext4_fsblk_t
2098 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2099 {
2100         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2101                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2102 }
2103
2104 /*
2105  * Special error return code only used by dx_probe() and its callers.
2106  */
2107 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2108
2109 /*
2110  * Timeout and state flag for lazy initialization inode thread.
2111  */
2112 #define EXT4_DEF_LI_WAIT_MULT                   10
2113 #define EXT4_DEF_LI_MAX_START_DELAY             5
2114 #define EXT4_LAZYINIT_QUIT                      0x0001
2115 #define EXT4_LAZYINIT_RUNNING                   0x0002
2116
2117 /*
2118  * Lazy inode table initialization info
2119  */
2120 struct ext4_lazy_init {
2121         unsigned long           li_state;
2122         struct list_head        li_request_list;
2123         struct mutex            li_list_mtx;
2124 };
2125
2126 struct ext4_li_request {
2127         struct super_block      *lr_super;
2128         struct ext4_sb_info     *lr_sbi;
2129         ext4_group_t            lr_next_group;
2130         struct list_head        lr_request;
2131         unsigned long           lr_next_sched;
2132         unsigned long           lr_timeout;
2133 };
2134
2135 struct ext4_features {
2136         struct kobject f_kobj;
2137         struct completion f_kobj_unregister;
2138 };
2139
2140 /*
2141  * This structure will be used for multiple mount protection. It will be
2142  * written into the block number saved in the s_mmp_block field in the
2143  * superblock. Programs that check MMP should assume that if
2144  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2145  * to use the filesystem, regardless of how old the timestamp is.
2146  */
2147 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2148 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2149 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2150 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2151
2152 struct mmp_struct {
2153         __le32  mmp_magic;              /* Magic number for MMP */
2154         __le32  mmp_seq;                /* Sequence no. updated periodically */
2155
2156         /*
2157          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2158          * purposes and do not affect the correctness of the algorithm
2159          */
2160         __le64  mmp_time;               /* Time last updated */
2161         char    mmp_nodename[64];       /* Node which last updated MMP block */
2162         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2163
2164         /*
2165          * mmp_check_interval is used to verify if the MMP block has been
2166          * updated on the block device. The value is updated based on the
2167          * maximum time to write the MMP block during an update cycle.
2168          */
2169         __le16  mmp_check_interval;
2170
2171         __le16  mmp_pad1;
2172         __le32  mmp_pad2[226];
2173         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2174 };
2175
2176 /* arguments passed to the mmp thread */
2177 struct mmpd_data {
2178         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2179         struct super_block *sb;  /* super block of the fs */
2180 };
2181
2182 /*
2183  * Check interval multiplier
2184  * The MMP block is written every update interval and initially checked every
2185  * update interval x the multiplier (the value is then adapted based on the
2186  * write latency). The reason is that writes can be delayed under load and we
2187  * don't want readers to incorrectly assume that the filesystem is no longer
2188  * in use.
2189  */
2190 #define EXT4_MMP_CHECK_MULT             2UL
2191
2192 /*
2193  * Minimum interval for MMP checking in seconds.
2194  */
2195 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2196
2197 /*
2198  * Maximum interval for MMP checking in seconds.
2199  */
2200 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2201
2202 /*
2203  * Function prototypes
2204  */
2205
2206 /*
2207  * Ok, these declarations are also in <linux/kernel.h> but none of the
2208  * ext4 source programs needs to include it so they are duplicated here.
2209  */
2210 # define NORET_TYPE     /**/
2211 # define ATTRIB_NORET   __attribute__((noreturn))
2212 # define NORET_AND      noreturn,
2213
2214 /* bitmap.c */
2215 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2216 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2217                                 struct ext4_group_desc *gdp,
2218                                 struct buffer_head *bh, int sz);
2219 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2220                                   struct ext4_group_desc *gdp,
2221                                   struct buffer_head *bh, int sz);
2222 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2223                                 struct ext4_group_desc *gdp,
2224                                 struct buffer_head *bh);
2225 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2226                                   struct ext4_group_desc *gdp,
2227                                   struct buffer_head *bh);
2228
2229 /* balloc.c */
2230 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2231                                          ext4_fsblk_t blocknr,
2232                                          ext4_group_t *blockgrpp,
2233                                          ext4_grpblk_t *offsetp);
2234 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2235                                           ext4_fsblk_t block);
2236
2237 extern unsigned int ext4_block_group(struct super_block *sb,
2238                         ext4_fsblk_t blocknr);
2239 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2240                         ext4_fsblk_t blocknr);
2241 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2242 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2243                         ext4_group_t group);
2244 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2245                                          ext4_fsblk_t goal,
2246                                          unsigned int flags,
2247                                          unsigned long *count,
2248                                          int *errp);
2249 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2250                                     s64 nclusters, unsigned int flags);
2251 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2252 extern void ext4_check_blocks_bitmap(struct super_block *);
2253 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2254                                                     ext4_group_t block_group,
2255                                                     struct buffer_head ** bh);
2256 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2257
2258 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2259                                                 ext4_group_t block_group);
2260 extern int ext4_wait_block_bitmap(struct super_block *sb,
2261                                   ext4_group_t block_group,
2262                                   struct buffer_head *bh);
2263 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2264                                                   ext4_group_t block_group);
2265 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2266                                               ext4_group_t block_group,
2267                                               struct ext4_group_desc *gdp);
2268 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2269
2270 /* crypto_policy.c */
2271 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2272                                                  struct inode *child);
2273 int ext4_inherit_context(struct inode *parent, struct inode *child);
2274 void ext4_to_hex(char *dst, char *src, size_t src_size);
2275 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2276                         struct inode *inode);
2277 int ext4_get_policy(struct inode *inode,
2278                     struct ext4_encryption_policy *policy);
2279
2280 /* crypto.c */
2281 extern struct kmem_cache *ext4_crypt_info_cachep;
2282 bool ext4_valid_contents_enc_mode(uint32_t mode);
2283 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2284 extern struct workqueue_struct *ext4_read_workqueue;
2285 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode);
2286 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2287 void ext4_restore_control_page(struct page *data_page);
2288 struct page *ext4_encrypt(struct inode *inode,
2289                           struct page *plaintext_page);
2290 int ext4_decrypt(struct page *page);
2291 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
2292                            ext4_fsblk_t pblk, ext4_lblk_t len);
2293 extern const struct dentry_operations ext4_encrypted_d_ops;
2294
2295 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2296 int ext4_init_crypto(void);
2297 void ext4_exit_crypto(void);
2298 static inline int ext4_sb_has_crypto(struct super_block *sb)
2299 {
2300         return ext4_has_feature_encrypt(sb);
2301 }
2302 #else
2303 static inline int ext4_init_crypto(void) { return 0; }
2304 static inline void ext4_exit_crypto(void) { }
2305 static inline int ext4_sb_has_crypto(struct super_block *sb)
2306 {
2307         return 0;
2308 }
2309 #endif
2310
2311 /* crypto_fname.c */
2312 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2313 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2314 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2315 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2316                                    u32 ilen, struct ext4_str *crypto_str);
2317 int _ext4_fname_disk_to_usr(struct inode *inode,
2318                             struct dx_hash_info *hinfo,
2319                             const struct ext4_str *iname,
2320                             struct ext4_str *oname);
2321 int ext4_fname_disk_to_usr(struct inode *inode,
2322                            struct dx_hash_info *hinfo,
2323                            const struct ext4_dir_entry_2 *de,
2324                            struct ext4_str *oname);
2325 int ext4_fname_usr_to_disk(struct inode *inode,
2326                            const struct qstr *iname,
2327                            struct ext4_str *oname);
2328 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2329 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2330 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2331                               int lookup, struct ext4_filename *fname);
2332 void ext4_fname_free_filename(struct ext4_filename *fname);
2333 #else
2334 static inline
2335 int ext4_setup_fname_crypto(struct inode *inode)
2336 {
2337         return 0;
2338 }
2339 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2340 static inline int ext4_fname_setup_filename(struct inode *dir,
2341                                      const struct qstr *iname,
2342                                      int lookup, struct ext4_filename *fname)
2343 {
2344         fname->usr_fname = iname;
2345         fname->disk_name.name = (unsigned char *) iname->name;
2346         fname->disk_name.len = iname->len;
2347         return 0;
2348 }
2349 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2350 #endif
2351
2352
2353 /* crypto_key.c */
2354 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2355 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2356 int _ext4_get_encryption_info(struct inode *inode);
2357
2358 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2359 int ext4_has_encryption_key(struct inode *inode);
2360
2361 static inline int ext4_get_encryption_info(struct inode *inode)
2362 {
2363         struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2364
2365         if (!ci ||
2366             (ci->ci_keyring_key &&
2367              (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2368                                            (1 << KEY_FLAG_REVOKED) |
2369                                            (1 << KEY_FLAG_DEAD)))))
2370                 return _ext4_get_encryption_info(inode);
2371         return 0;
2372 }
2373
2374 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2375 {
2376         return EXT4_I(inode)->i_crypt_info;
2377 }
2378
2379 #else
2380 static inline int ext4_has_encryption_key(struct inode *inode)
2381 {
2382         return 0;
2383 }
2384 static inline int ext4_get_encryption_info(struct inode *inode)
2385 {
2386         return 0;
2387 }
2388 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2389 {
2390         return NULL;
2391 }
2392 #endif
2393
2394
2395 /* dir.c */
2396 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2397                                   struct file *,
2398                                   struct ext4_dir_entry_2 *,
2399                                   struct buffer_head *, char *, int,
2400                                   unsigned int);
2401 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2402         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2403                                         (de), (bh), (buf), (size), (offset)))
2404 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2405                                 __u32 minor_hash,
2406                                 struct ext4_dir_entry_2 *dirent,
2407                                 struct ext4_str *ent_name);
2408 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2409 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2410                              struct buffer_head *bh,
2411                              void *buf, int buf_size,
2412                              struct ext4_filename *fname,
2413                              struct ext4_dir_entry_2 **dest_de);
2414 int ext4_insert_dentry(struct inode *dir,
2415                        struct inode *inode,
2416                        struct ext4_dir_entry_2 *de,
2417                        int buf_size,
2418                        struct ext4_filename *fname);
2419 static inline void ext4_update_dx_flag(struct inode *inode)
2420 {
2421         if (!ext4_has_feature_dir_index(inode->i_sb))
2422                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2423 }
2424 static unsigned char ext4_filetype_table[] = {
2425         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2426 };
2427
2428 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2429 {
2430         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2431                 return DT_UNKNOWN;
2432
2433         return ext4_filetype_table[filetype];
2434 }
2435 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2436                              void *buf, int buf_size);
2437
2438 /* fsync.c */
2439 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2440
2441 /* hash.c */
2442 extern int ext4fs_dirhash(const char *name, int len, struct
2443                           dx_hash_info *hinfo);
2444
2445 /* ialloc.c */
2446 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2447                                       const struct qstr *qstr, __u32 goal,
2448                                       uid_t *owner, int handle_type,
2449                                       unsigned int line_no, int nblocks);
2450
2451 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2452         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2453                          0, 0, 0)
2454 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2455                                     type, nblocks)                  \
2456         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2457                          (type), __LINE__, (nblocks))
2458
2459
2460 extern void ext4_free_inode(handle_t *, struct inode *);
2461 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2462 extern unsigned long ext4_count_free_inodes(struct super_block *);
2463 extern unsigned long ext4_count_dirs(struct super_block *);
2464 extern void ext4_check_inodes_bitmap(struct super_block *);
2465 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2466 extern int ext4_init_inode_table(struct super_block *sb,
2467                                  ext4_group_t group, int barrier);
2468 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2469
2470 /* mballoc.c */
2471 extern const struct file_operations ext4_seq_mb_groups_fops;
2472 extern long ext4_mb_stats;
2473 extern long ext4_mb_max_to_scan;
2474 extern int ext4_mb_init(struct super_block *);
2475 extern int ext4_mb_release(struct super_block *);
2476 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2477                                 struct ext4_allocation_request *, int *);
2478 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2479 extern void ext4_discard_preallocations(struct inode *);
2480 extern int __init ext4_init_mballoc(void);
2481 extern void ext4_exit_mballoc(void);
2482 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2483                              struct buffer_head *bh, ext4_fsblk_t block,
2484                              unsigned long count, int flags);
2485 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2486                                    ext4_group_t ngroups);
2487 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2488                 ext4_group_t i, struct ext4_group_desc *desc);
2489 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2490                                 ext4_fsblk_t block, unsigned long count);
2491 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2492
2493 /* inode.c */
2494 int ext4_inode_is_fast_symlink(struct inode *inode);
2495 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2496 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2497 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2498                              struct buffer_head *bh_result, int create);
2499 int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock,
2500                             struct buffer_head *bh_result, int create);
2501 int ext4_get_block(struct inode *inode, sector_t iblock,
2502                    struct buffer_head *bh_result, int create);
2503 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2504                        struct buffer_head *bh_result, int create);
2505 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2506                            struct buffer_head *bh, int create);
2507 int ext4_walk_page_buffers(handle_t *handle,
2508                            struct buffer_head *head,
2509                            unsigned from,
2510                            unsigned to,
2511                            int *partial,
2512                            int (*fn)(handle_t *handle,
2513                                      struct buffer_head *bh));
2514 int do_journal_get_write_access(handle_t *handle,
2515                                 struct buffer_head *bh);
2516 #define FALL_BACK_TO_NONDELALLOC 1
2517 #define CONVERT_INLINE_DATA      2
2518
2519 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2520 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2521 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2522 extern int  ext4_setattr(struct dentry *, struct iattr *);
2523 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2524                                 struct kstat *stat);
2525 extern void ext4_evict_inode(struct inode *);
2526 extern void ext4_clear_inode(struct inode *);
2527 extern int  ext4_sync_inode(handle_t *, struct inode *);
2528 extern void ext4_dirty_inode(struct inode *, int);
2529 extern int ext4_change_inode_journal_flag(struct inode *, int);
2530 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2531 extern int ext4_inode_attach_jinode(struct inode *inode);
2532 extern int ext4_can_truncate(struct inode *inode);
2533 extern void ext4_truncate(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 void ext4_get_inode_flags(struct ext4_inode_info *);
2538 extern int ext4_alloc_da_blocks(struct inode *inode);
2539 extern void ext4_set_aops(struct inode *inode);
2540 extern int ext4_writepage_trans_blocks(struct inode *);
2541 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2542 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2543                              loff_t lstart, loff_t lend);
2544 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2545 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
2546 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2547 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
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 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
2553                                 unsigned int map_len,
2554                                 struct extent_status *result);
2555
2556 /* indirect.c */
2557 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2558                                 struct ext4_map_blocks *map, int flags);
2559 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2560                                   loff_t offset);
2561 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2562 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2563 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2564 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2565                                  ext4_lblk_t start, ext4_lblk_t end);
2566
2567 /* ioctl.c */
2568 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2569 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2570
2571 /* migrate.c */
2572 extern int ext4_ext_migrate(struct inode *);
2573 extern int ext4_ind_migrate(struct inode *inode);
2574
2575 /* namei.c */
2576 extern int ext4_dirent_csum_verify(struct inode *inode,
2577                                    struct ext4_dir_entry *dirent);
2578 extern int ext4_orphan_add(handle_t *, struct inode *);
2579 extern int ext4_orphan_del(handle_t *, struct inode *);
2580 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2581                                 __u32 start_minor_hash, __u32 *next_hash);
2582 extern int ext4_search_dir(struct buffer_head *bh,
2583                            char *search_buf,
2584                            int buf_size,
2585                            struct inode *dir,
2586                            struct ext4_filename *fname,
2587                            const struct qstr *d_name,
2588                            unsigned int offset,
2589                            struct ext4_dir_entry_2 **res_dir);
2590 extern int ext4_generic_delete_entry(handle_t *handle,
2591                                      struct inode *dir,
2592                                      struct ext4_dir_entry_2 *de_del,
2593                                      struct buffer_head *bh,
2594                                      void *entry_buf,
2595                                      int buf_size,
2596                                      int csum_size);
2597 extern int ext4_empty_dir(struct inode *inode);
2598
2599 /* resize.c */
2600 extern int ext4_group_add(struct super_block *sb,
2601                                 struct ext4_new_group_data *input);
2602 extern int ext4_group_extend(struct super_block *sb,
2603                                 struct ext4_super_block *es,
2604                                 ext4_fsblk_t n_blocks_count);
2605 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2606
2607 /* super.c */
2608 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2609 extern int ext4_calculate_overhead(struct super_block *sb);
2610 extern void ext4_superblock_csum_set(struct super_block *sb);
2611 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2612 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2613 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2614                                     ext4_group_t ngroup);
2615 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2616                                      char nbuf[16]);
2617
2618 extern __printf(4, 5)
2619 void __ext4_error(struct super_block *, const char *, unsigned int,
2620                   const char *, ...);
2621 extern __printf(5, 6)
2622 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2623                       const char *, ...);
2624 extern __printf(5, 6)
2625 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2626                      const char *, ...);
2627 extern void __ext4_std_error(struct super_block *, const char *,
2628                              unsigned int, int);
2629 extern __printf(4, 5)
2630 void __ext4_abort(struct super_block *, const char *, unsigned int,
2631                   const char *, ...);
2632 extern __printf(4, 5)
2633 void __ext4_warning(struct super_block *, const char *, unsigned int,
2634                     const char *, ...);
2635 extern __printf(4, 5)
2636 void __ext4_warning_inode(const struct inode *inode, const char *function,
2637                           unsigned int line, const char *fmt, ...);
2638 extern __printf(3, 4)
2639 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2640 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2641                            const char *, unsigned int, const char *);
2642 extern __printf(7, 8)
2643 void __ext4_grp_locked_error(const char *, unsigned int,
2644                              struct super_block *, ext4_group_t,
2645                              unsigned long, ext4_fsblk_t,
2646                              const char *, ...);
2647
2648 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2649         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2650
2651 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2652         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2653
2654 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2655         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2656
2657 #ifdef CONFIG_PRINTK
2658
2659 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2660         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2661 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2662         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2663 #define ext4_error(sb, fmt, ...)                                        \
2664         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2665 #define ext4_abort(sb, fmt, ...)                                        \
2666         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2667 #define ext4_warning(sb, fmt, ...)                                      \
2668         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2669 #define ext4_warning_inode(inode, fmt, ...)                             \
2670         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2671 #define ext4_msg(sb, level, fmt, ...)                           \
2672         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2673 #define dump_mmp_msg(sb, mmp, msg)                                      \
2674         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2675 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2676         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2677                                 fmt, ##__VA_ARGS__)
2678
2679 #else
2680
2681 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2682 do {                                                                    \
2683         no_printk(fmt, ##__VA_ARGS__);                                  \
2684         __ext4_error_inode(inode, "", 0, block, " ");                   \
2685 } while (0)
2686 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2687 do {                                                                    \
2688         no_printk(fmt, ##__VA_ARGS__);                                  \
2689         __ext4_error_file(file, "", 0, block, " ");                     \
2690 } while (0)
2691 #define ext4_error(sb, fmt, ...)                                        \
2692 do {                                                                    \
2693         no_printk(fmt, ##__VA_ARGS__);                                  \
2694         __ext4_error(sb, "", 0, " ");                                   \
2695 } while (0)
2696 #define ext4_abort(sb, fmt, ...)                                        \
2697 do {                                                                    \
2698         no_printk(fmt, ##__VA_ARGS__);                                  \
2699         __ext4_abort(sb, "", 0, " ");                                   \
2700 } while (0)
2701 #define ext4_warning(sb, fmt, ...)                                      \
2702 do {                                                                    \
2703         no_printk(fmt, ##__VA_ARGS__);                                  \
2704         __ext4_warning(sb, "", 0, " ");                                 \
2705 } while (0)
2706 #define ext4_warning_inode(inode, fmt, ...)                             \
2707 do {                                                                    \
2708         no_printk(fmt, ##__VA_ARGS__);                                  \
2709         __ext4_warning_inode(inode, "", 0, " ");                        \
2710 } while (0)
2711 #define ext4_msg(sb, level, fmt, ...)                                   \
2712 do {                                                                    \
2713         no_printk(fmt, ##__VA_ARGS__);                                  \
2714         __ext4_msg(sb, "", " ");                                        \
2715 } while (0)
2716 #define dump_mmp_msg(sb, mmp, msg)                                      \
2717         __dump_mmp_msg(sb, mmp, "", 0, "")
2718 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2719 do {                                                                    \
2720         no_printk(fmt, ##__VA_ARGS__);                          \
2721         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2722 } while (0)
2723
2724 #endif
2725
2726 extern void ext4_update_dynamic_rev(struct super_block *sb);
2727 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2728                                         __u32 compat);
2729 extern int ext4_update_rocompat_feature(handle_t *handle,
2730                                         struct super_block *sb, __u32 rocompat);
2731 extern int ext4_update_incompat_feature(handle_t *handle,
2732                                         struct super_block *sb, __u32 incompat);
2733 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2734                                       struct ext4_group_desc *bg);
2735 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2736                                       struct ext4_group_desc *bg);
2737 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2738                                      struct ext4_group_desc *bg);
2739 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2740                                       struct ext4_group_desc *bg);
2741 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2742                                  struct ext4_group_desc *bg);
2743 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2744                                 struct ext4_group_desc *bg);
2745 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2746                                    struct ext4_group_desc *bg);
2747 extern void ext4_block_bitmap_set(struct super_block *sb,
2748                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2749 extern void ext4_inode_bitmap_set(struct super_block *sb,
2750                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2751 extern void ext4_inode_table_set(struct super_block *sb,
2752                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2753 extern void ext4_free_group_clusters_set(struct super_block *sb,
2754                                          struct ext4_group_desc *bg,
2755                                          __u32 count);
2756 extern void ext4_free_inodes_set(struct super_block *sb,
2757                                 struct ext4_group_desc *bg, __u32 count);
2758 extern void ext4_used_dirs_set(struct super_block *sb,
2759                                 struct ext4_group_desc *bg, __u32 count);
2760 extern void ext4_itable_unused_set(struct super_block *sb,
2761                                    struct ext4_group_desc *bg, __u32 count);
2762 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2763                                        struct ext4_group_desc *gdp);
2764 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2765                                      struct ext4_group_desc *gdp);
2766 extern int ext4_register_li_request(struct super_block *sb,
2767                                     ext4_group_t first_not_zeroed);
2768
2769 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2770 {
2771         return ext4_has_feature_gdt_csum(sb) ||
2772                EXT4_SB(sb)->s_chksum_driver != NULL;
2773 }
2774
2775 static inline int ext4_has_metadata_csum(struct super_block *sb)
2776 {
2777         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2778                      !EXT4_SB(sb)->s_chksum_driver);
2779
2780         return (EXT4_SB(sb)->s_chksum_driver != NULL);
2781 }
2782 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2783 {
2784         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2785                 le32_to_cpu(es->s_blocks_count_lo);
2786 }
2787
2788 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2789 {
2790         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2791                 le32_to_cpu(es->s_r_blocks_count_lo);
2792 }
2793
2794 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2795 {
2796         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2797                 le32_to_cpu(es->s_free_blocks_count_lo);
2798 }
2799
2800 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2801                                          ext4_fsblk_t blk)
2802 {
2803         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2804         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2805 }
2806
2807 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2808                                               ext4_fsblk_t blk)
2809 {
2810         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2811         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2812 }
2813
2814 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2815                                            ext4_fsblk_t blk)
2816 {
2817         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2818         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2819 }
2820
2821 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2822 {
2823         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2824                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2825                         le32_to_cpu(raw_inode->i_size_lo);
2826         else
2827                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2828 }
2829
2830 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2831 {
2832         raw_inode->i_size_lo = cpu_to_le32(i_size);
2833         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2834 }
2835
2836 static inline
2837 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2838                                             ext4_group_t group)
2839 {
2840          struct ext4_group_info ***grp_info;
2841          long indexv, indexh;
2842          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2843          grp_info = EXT4_SB(sb)->s_group_info;
2844          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2845          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2846          return grp_info[indexv][indexh];
2847 }
2848
2849 /*
2850  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2851  * the locking protocol documented in the comments of ext4_group_add()
2852  * in resize.c
2853  */
2854 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2855 {
2856         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2857
2858         smp_rmb();
2859         return ngroups;
2860 }
2861
2862 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2863                                              ext4_group_t block_group)
2864 {
2865         return block_group >> sbi->s_log_groups_per_flex;
2866 }
2867
2868 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2869 {
2870         return 1 << sbi->s_log_groups_per_flex;
2871 }
2872
2873 #define ext4_std_error(sb, errno)                               \
2874 do {                                                            \
2875         if ((errno))                                            \
2876                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2877 } while (0)
2878
2879 #ifdef CONFIG_SMP
2880 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2881  * counters. So we need to make sure we have free clusters more
2882  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2883  */
2884 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2885 #else
2886 #define EXT4_FREECLUSTERS_WATERMARK 0
2887 #endif
2888
2889 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2890 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2891 {
2892         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2893                      !inode_is_locked(inode));
2894         down_write(&EXT4_I(inode)->i_data_sem);
2895         if (newsize > EXT4_I(inode)->i_disksize)
2896                 EXT4_I(inode)->i_disksize = newsize;
2897         up_write(&EXT4_I(inode)->i_data_sem);
2898 }
2899
2900 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2901 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2902 {
2903         int changed = 0;
2904
2905         if (newsize > inode->i_size) {
2906                 i_size_write(inode, newsize);
2907                 changed = 1;
2908         }
2909         if (newsize > EXT4_I(inode)->i_disksize) {
2910                 ext4_update_i_disksize(inode, newsize);
2911                 changed |= 2;
2912         }
2913         return changed;
2914 }
2915
2916 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2917                                       loff_t len);
2918
2919 struct ext4_group_info {
2920         unsigned long   bb_state;
2921         struct rb_root  bb_free_root;
2922         ext4_grpblk_t   bb_first_free;  /* first free block */
2923         ext4_grpblk_t   bb_free;        /* total free blocks */
2924         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2925         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2926         struct          list_head bb_prealloc_list;
2927 #ifdef DOUBLE_CHECK
2928         void            *bb_bitmap;
2929 #endif
2930         struct rw_semaphore alloc_sem;
2931         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2932                                          * regions, index is order.
2933                                          * bb_counters[3] = 5 means
2934                                          * 5 free 8-block regions. */
2935 };
2936
2937 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2938 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2939 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2940 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2941
2942 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2943         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2944 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2945         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2946 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2947         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2948
2949 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2950         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2951 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2952         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2953 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2954         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2955
2956 #define EXT4_MAX_CONTENTION             8
2957 #define EXT4_CONTENTION_THRESHOLD       2
2958
2959 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2960                                               ext4_group_t group)
2961 {
2962         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2963 }
2964
2965 /*
2966  * Returns true if the filesystem is busy enough that attempts to
2967  * access the block group locks has run into contention.
2968  */
2969 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2970 {
2971         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2972 }
2973
2974 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2975 {
2976         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2977         if (spin_trylock(lock))
2978                 /*
2979                  * We're able to grab the lock right away, so drop the
2980                  * lock contention counter.
2981                  */
2982                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2983         else {
2984                 /*
2985                  * The lock is busy, so bump the contention counter,
2986                  * and then wait on the spin lock.
2987                  */
2988                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2989                                   EXT4_MAX_CONTENTION);
2990                 spin_lock(lock);
2991         }
2992 }
2993
2994 static inline void ext4_unlock_group(struct super_block *sb,
2995                                         ext4_group_t group)
2996 {
2997         spin_unlock(ext4_group_lock_ptr(sb, group));
2998 }
2999
3000 /*
3001  * Block validity checking
3002  */
3003 #define ext4_check_indirect_blockref(inode, bh)                         \
3004         ext4_check_blockref(__func__, __LINE__, inode,                  \
3005                             (__le32 *)(bh)->b_data,                     \
3006                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3007
3008 #define ext4_ind_check_inode(inode)                                     \
3009         ext4_check_blockref(__func__, __LINE__, inode,                  \
3010                             EXT4_I(inode)->i_data,                      \
3011                             EXT4_NDIR_BLOCKS)
3012
3013 /*
3014  * Inodes and files operations
3015  */
3016
3017 /* dir.c */
3018 extern const struct file_operations ext4_dir_operations;
3019
3020 /* file.c */
3021 extern const struct inode_operations ext4_file_inode_operations;
3022 extern const struct file_operations ext4_file_operations;
3023 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3024
3025 /* inline.c */
3026 extern int ext4_get_max_inline_size(struct inode *inode);
3027 extern int ext4_find_inline_data_nolock(struct inode *inode);
3028 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3029                                  unsigned int len);
3030 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3031
3032 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3033 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3034                                          struct inode *inode,
3035                                          loff_t pos, unsigned len,
3036                                          unsigned flags,
3037                                          struct page **pagep);
3038 extern int ext4_write_inline_data_end(struct inode *inode,
3039                                       loff_t pos, unsigned len,
3040                                       unsigned copied,
3041                                       struct page *page);
3042 extern struct buffer_head *
3043 ext4_journalled_write_inline_data(struct inode *inode,
3044                                   unsigned len,
3045                                   struct page *page);
3046 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3047                                            struct inode *inode,
3048                                            loff_t pos, unsigned len,
3049                                            unsigned flags,
3050                                            struct page **pagep,
3051                                            void **fsdata);
3052 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3053                                          unsigned len, unsigned copied,
3054                                          struct page *page);
3055 extern int ext4_try_add_inline_entry(handle_t *handle,
3056                                      struct ext4_filename *fname,
3057                                      struct inode *dir, struct inode *inode);
3058 extern int ext4_try_create_inline_dir(handle_t *handle,
3059                                       struct inode *parent,
3060                                       struct inode *inode);
3061 extern int ext4_read_inline_dir(struct file *filp,
3062                                 struct dir_context *ctx,
3063                                 int *has_inline_data);
3064 extern int htree_inlinedir_to_tree(struct file *dir_file,
3065                                    struct inode *dir, ext4_lblk_t block,
3066                                    struct dx_hash_info *hinfo,
3067                                    __u32 start_hash, __u32 start_minor_hash,
3068                                    int *has_inline_data);
3069 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3070                                         struct ext4_filename *fname,
3071                                         const struct qstr *d_name,
3072                                         struct ext4_dir_entry_2 **res_dir,
3073                                         int *has_inline_data);
3074 extern int ext4_delete_inline_entry(handle_t *handle,
3075                                     struct inode *dir,
3076                                     struct ext4_dir_entry_2 *de_del,
3077                                     struct buffer_head *bh,
3078                                     int *has_inline_data);
3079 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
3080 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3081                                         struct ext4_dir_entry_2 **parent_de,
3082                                         int *retval);
3083 extern int ext4_inline_data_fiemap(struct inode *inode,
3084                                    struct fiemap_extent_info *fieinfo,
3085                                    int *has_inline, __u64 start, __u64 len);
3086 extern int ext4_try_to_evict_inline_data(handle_t *handle,
3087                                          struct inode *inode,
3088                                          int needed);
3089 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3090
3091 extern int ext4_convert_inline_data(struct inode *inode);
3092
3093 static inline int ext4_has_inline_data(struct inode *inode)
3094 {
3095         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3096                EXT4_I(inode)->i_inline_off;
3097 }
3098
3099 /* namei.c */
3100 extern const struct inode_operations ext4_dir_inode_operations;
3101 extern const struct inode_operations ext4_special_inode_operations;
3102 extern struct dentry *ext4_get_parent(struct dentry *child);
3103 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3104                                  struct ext4_dir_entry_2 *de,
3105                                  int blocksize, int csum_size,
3106                                  unsigned int parent_ino, int dotdot_real_len);
3107 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3108                                    unsigned int blocksize);
3109 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3110                                          struct inode *inode,
3111                                          struct buffer_head *bh);
3112 #define S_SHIFT 12
3113 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3114         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3115         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3116         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3117         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3118         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3119         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3120         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3121 };
3122
3123 static inline void ext4_set_de_type(struct super_block *sb,
3124                                 struct ext4_dir_entry_2 *de,
3125                                 umode_t mode) {
3126         if (ext4_has_feature_filetype(sb))
3127                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3128 }
3129
3130 /* readpages.c */
3131 extern int ext4_mpage_readpages(struct address_space *mapping,
3132                                 struct list_head *pages, struct page *page,
3133                                 unsigned nr_pages);
3134
3135 /* symlink.c */
3136 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3137 extern const struct inode_operations ext4_symlink_inode_operations;
3138 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3139
3140 /* sysfs.c */
3141 extern int ext4_register_sysfs(struct super_block *sb);
3142 extern void ext4_unregister_sysfs(struct super_block *sb);
3143 extern int __init ext4_init_sysfs(void);
3144 extern void ext4_exit_sysfs(void);
3145
3146 /* block_validity */
3147 extern void ext4_release_system_zone(struct super_block *sb);
3148 extern int ext4_setup_system_zone(struct super_block *sb);
3149 extern int __init ext4_init_system_zone(void);
3150 extern void ext4_exit_system_zone(void);
3151 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3152                                  ext4_fsblk_t start_blk,
3153                                  unsigned int count);
3154 extern int ext4_check_blockref(const char *, unsigned int,
3155                                struct inode *, __le32 *, unsigned int);
3156
3157 /* extents.c */
3158 struct ext4_ext_path;
3159 struct ext4_extent;
3160
3161 /*
3162  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3163  * __le32.
3164  */
3165 #define EXT_MAX_BLOCKS  0xffffffff
3166
3167 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3168 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3169 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3170 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3171                                struct ext4_map_blocks *map, int flags);
3172 extern void ext4_ext_truncate(handle_t *, struct inode *);
3173 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3174                                  ext4_lblk_t end);
3175 extern void ext4_ext_init(struct super_block *);
3176 extern void ext4_ext_release(struct super_block *);
3177 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3178                           loff_t len);
3179 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3180                                           loff_t offset, ssize_t len);
3181 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3182                            struct ext4_map_blocks *map, int flags);
3183 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3184                                          ext4_lblk_t lblocks);
3185 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3186                                                    int num,
3187                                                    struct ext4_ext_path *path);
3188 extern int ext4_can_extents_be_merged(struct inode *inode,
3189                                       struct ext4_extent *ex1,
3190                                       struct ext4_extent *ex2);
3191 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3192                                   struct ext4_ext_path **,
3193                                   struct ext4_extent *, int);
3194 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3195                                               struct ext4_ext_path **,
3196                                               int flags);
3197 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3198 extern int ext4_ext_check_inode(struct inode *inode);
3199 extern int ext4_find_delalloc_range(struct inode *inode,
3200                                     ext4_lblk_t lblk_start,
3201                                     ext4_lblk_t lblk_end);
3202 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3203 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3204 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3205                         __u64 start, __u64 len);
3206 extern int ext4_ext_precache(struct inode *inode);
3207 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3208 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3209 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3210                                 struct inode *inode2, ext4_lblk_t lblk1,
3211                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3212                              int mark_unwritten,int *err);
3213
3214 /* move_extent.c */
3215 extern void ext4_double_down_write_data_sem(struct inode *first,
3216                                             struct inode *second);
3217 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3218                                           struct inode *donor_inode);
3219 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3220                              __u64 start_orig, __u64 start_donor,
3221                              __u64 len, __u64 *moved_len);
3222
3223 /* page-io.c */
3224 extern int __init ext4_init_pageio(void);
3225 extern void ext4_exit_pageio(void);
3226 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3227 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3228 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3229 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3230 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3231                                 struct writeback_control *wbc);
3232 extern void ext4_end_io_rsv_work(struct work_struct *work);
3233 extern void ext4_io_submit(struct ext4_io_submit *io);
3234 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3235                                struct page *page,
3236                                int len,
3237                                struct writeback_control *wbc,
3238                                bool keep_towrite);
3239
3240 /* mmp.c */
3241 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3242
3243 /*
3244  * Add new method to test whether block and inode bitmaps are properly
3245  * initialized. With uninit_bg reading the block from disk is not enough
3246  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3247  */
3248 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3249
3250 static inline int bitmap_uptodate(struct buffer_head *bh)
3251 {
3252         return (buffer_uptodate(bh) &&
3253                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3254 }
3255 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3256 {
3257         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3258 }
3259
3260 /*
3261  * Disable DIO read nolock optimization, so new dioreaders will be forced
3262  * to grab i_mutex
3263  */
3264 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3265 {
3266         ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3267         smp_mb();
3268 }
3269 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3270 {
3271         smp_mb();
3272         ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3273 }
3274
3275 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3276
3277 /* For ioend & aio unwritten conversion wait queues */
3278 #define EXT4_WQ_HASH_SZ         37
3279 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3280                                             EXT4_WQ_HASH_SZ])
3281 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3282
3283 #define EXT4_RESIZING   0
3284 extern int ext4_resize_begin(struct super_block *sb);
3285 extern void ext4_resize_end(struct super_block *sb);
3286
3287 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3288                                               struct ext4_io_end *io_end)
3289 {
3290         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3291                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3292                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3293         }
3294 }
3295
3296 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3297 {
3298         struct inode *inode = io_end->inode;
3299
3300         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3301                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3302                 /* Wake up anyone waiting on unwritten extent conversion */
3303                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3304                         wake_up_all(ext4_ioend_wq(inode));
3305         }
3306 }
3307
3308 #endif  /* __KERNEL__ */
3309
3310 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3311 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3312
3313 #endif  /* _EXT4_H */