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/wait.h>
  30 #include <linux/blockgroup_lock.h>
  31 #include <linux/percpu_counter.h>
  32 #include <linux/ratelimit.h>
  33 #include <crypto/hash.h>
  34 #include <linux/falloc.h>
  35 #ifdef __KERNEL__
  36 #include <linux/compat.h>
  37 #endif
  38
  39 /*
  40  * The fourth extended filesystem constants/structures
  41  */
  42
  43 /*
  44  * Define EXT4FS_DEBUG to produce debug messages
  45  */
  46 #undef EXT4FS_DEBUG
  47
  48 /*
  49  * Debug code
  50  */
  51 #ifdef EXT4FS_DEBUG
  52 #define ext4_debug(f, a...)                                             \
  53         do {                                                            \
  54                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  55                         __FILE__, __LINE__, __func__);                  \
  56                 printk(KERN_DEBUG f, ## a);                             \
  57         } while (0)
  58 #else
  59 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  60 #endif
  61
  62 /*
  63  * Turn on EXT_DEBUG to get lots of info about extents operations.
  64  */
  65 #define EXT_DEBUG__
  66 #ifdef EXT_DEBUG
  67 #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
  68 #else
  69 #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
  70 #endif
  71
  72 /* data type for block offset of block group */
  73 typedef int ext4_grpblk_t;
  74
  75 /* data type for filesystem-wide blocks number */
  76 typedef unsigned long long ext4_fsblk_t;
  77
  78 /* data type for file logical block number */
  79 typedef __u32 ext4_lblk_t;
  80
  81 /* data type for block group number */
  82 typedef unsigned int ext4_group_t;
  83
  84 enum SHIFT_DIRECTION {
  85         SHIFT_LEFT = 0,
  86         SHIFT_RIGHT,
  87 };
  88
  89 /*
  90  * Flags used in mballoc's allocation_context flags field.
  91  *
  92  * Also used to show what's going on for debugging purposes when the
  93  * flag field is exported via the traceport interface
  94  */
  95
  96 /* prefer goal again. length */
  97 #define EXT4_MB_HINT_MERGE              0x0001
  98 /* blocks already reserved */
  99 #define EXT4_MB_HINT_RESERVED           0x0002
 100 /* metadata is being allocated */
 101 #define EXT4_MB_HINT_METADATA           0x0004
 102 /* first blocks in the file */
 103 #define EXT4_MB_HINT_FIRST              0x0008
 104 /* search for the best chunk */
 105 #define EXT4_MB_HINT_BEST               0x0010
 106 /* data is being allocated */
 107 #define EXT4_MB_HINT_DATA               0x0020
 108 /* don't preallocate (for tails) */
 109 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 110 /* allocate for locality group */
 111 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 112 /* allocate goal blocks or none */
 113 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 114 /* goal is meaningful */
 115 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 116 /* blocks already pre-reserved by delayed allocation */
 117 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 118 /* We are doing stream allocation */
 119 #define EXT4_MB_STREAM_ALLOC            0x0800
 120 /* Use reserved root blocks if needed */
 121 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 122 /* Use blocks from reserved pool */
 123 #define EXT4_MB_USE_RESERVED            0x2000
 124
 125 struct ext4_allocation_request {
 126         /* target inode for block we're allocating */
 127         struct inode *inode;
 128         /* how many blocks we want to allocate */
 129         unsigned int len;
 130         /* logical block in target inode */
 131         ext4_lblk_t logical;
 132         /* the closest logical allocated block to the left */
 133         ext4_lblk_t lleft;
 134         /* the closest logical allocated block to the right */
 135         ext4_lblk_t lright;
 136         /* phys. target (a hint) */
 137         ext4_fsblk_t goal;
 138         /* phys. block for the closest logical allocated block to the left */
 139         ext4_fsblk_t pleft;
 140         /* phys. block for the closest logical allocated block to the right */
 141         ext4_fsblk_t pright;
 142         /* flags. see above EXT4_MB_HINT_* */
 143         unsigned int flags;
 144 };
 145
 146 /*
 147  * Logical to physical block mapping, used by ext4_map_blocks()
 148  *
 149  * This structure is used to pass requests into ext4_map_blocks() as
 150  * well as to store the information returned by ext4_map_blocks().  It
 151  * takes less room on the stack than a struct buffer_head.
 152  */
 153 #define EXT4_MAP_NEW            (1 << BH_New)
 154 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 155 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 156 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 157 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 158                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 159
 160 struct ext4_map_blocks {
 161         ext4_fsblk_t m_pblk;
 162         ext4_lblk_t m_lblk;
 163         unsigned int m_len;
 164         unsigned int m_flags;
 165 };
 166
 167 /*
 168  * Flags for ext4_io_end->flags
 169  */
 170 #define EXT4_IO_END_UNWRITTEN   0x0001
 171
 172 /*
 173  * For converting unwritten extents on a work queue. 'handle' is used for
 174  * buffered writeback.
 175  */
 176 typedef struct ext4_io_end {
 177         struct list_head        list;           /* per-file finished IO list */
 178         handle_t                *handle;        /* handle reserved for extent
 179                                                  * conversion */
 180         struct inode            *inode;         /* file being written to */
 181         struct bio              *bio;           /* Linked list of completed
 182                                                  * bios covering the extent */
 183         unsigned int            flag;           /* unwritten or not */
 184         loff_t                  offset;         /* offset in the file */
 185         ssize_t                 size;           /* size of the extent */
 186         atomic_t                count;          /* reference counter */
 187 } ext4_io_end_t;
 188
 189 struct ext4_io_submit {
 190         struct writeback_control *io_wbc;
 191         struct bio              *io_bio;
 192         ext4_io_end_t           *io_end;
 193         sector_t                io_next_block;
 194 };
 195
 196 /*
 197  * Special inodes numbers
 198  */
 199 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 200 #define EXT4_ROOT_INO            2      /* Root inode */
 201 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 202 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 203 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 204 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 205 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 206 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 207
 208 /* First non-reserved inode for old ext4 filesystems */
 209 #define EXT4_GOOD_OLD_FIRST_INO 11
 210
 211 /*
 212  * Maximal count of links to a file
 213  */
 214 #define EXT4_LINK_MAX           65000
 215
 216 /*
 217  * Macro-instructions used to manage several block sizes
 218  */
 219 #define EXT4_MIN_BLOCK_SIZE             1024
 220 #define EXT4_MAX_BLOCK_SIZE             65536
 221 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 222 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 223 #ifdef __KERNEL__
 224 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 225 #else
 226 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 227 #endif
 228 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 229 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 230                                          EXT4_SB(s)->s_cluster_bits)
 231 #ifdef __KERNEL__
 232 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 233 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 234 #else
 235 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 236 #endif
 237 #ifdef __KERNEL__
 238 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 239 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 240 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 241 #else
 242 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 243                                  EXT4_GOOD_OLD_INODE_SIZE : \
 244                                  (s)->s_inode_size)
 245 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 246                                  EXT4_GOOD_OLD_FIRST_INO : \
 247                                  (s)->s_first_ino)
 248 #endif
 249 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 250
 251 /* Translate a block number to a cluster number */
 252 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 253 /* Translate a cluster number to a block number */
 254 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 255 /* Translate # of blks to # of clusters */
 256 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 257                                  (sbi)->s_cluster_bits)
 258 /* Mask out the low bits to get the starting block of the cluster */
 259 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 260                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 261 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 262                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 263 /* Get the cluster offset */
 264 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 265                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 266 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 267                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 268
 269 /*
 270  * Structure of a blocks group descriptor
 271  */
 272 struct ext4_group_desc
 273 {
 274         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 275         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 276         __le32  bg_inode_table_lo;      /* Inodes table block */
 277         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 278         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 279         __le16  bg_used_dirs_count_lo;  /* Directories count */
 280         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 281         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 282         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 283         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 284         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 285         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 286         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 287         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 288         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 289         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 290         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 291         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 292         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 293         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 294         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 295         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 296         __u32   bg_reserved;
 297 };
 298
 299 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 300         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 301          sizeof(__le16))
 302 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 303         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 304          sizeof(__le16))
 305
 306 /*
 307  * Structure of a flex block group info
 308  */
 309
 310 struct flex_groups {
 311         atomic64_t      free_clusters;
 312         atomic_t        free_inodes;
 313         atomic_t        used_dirs;
 314 };
 315
 316 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 317 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 318 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 319
 320 /*
 321  * Macro-instructions used to manage group descriptors
 322  */
 323 #define EXT4_MIN_DESC_SIZE              32
 324 #define EXT4_MIN_DESC_SIZE_64BIT        64
 325 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 326 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 327 #ifdef __KERNEL__
 328 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 329 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 330 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 331 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 332 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 333 #else
 334 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 335 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 336 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 337 #endif
 338
 339 /*
 340  * Constants relative to the data blocks
 341  */
 342 #define EXT4_NDIR_BLOCKS                12
 343 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 344 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 345 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 346 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 347
 348 /*
 349  * Inode flags
 350  */
 351 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 352 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 353 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 354 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 355 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 356 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 357 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 358 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 359 /* Reserved for compression usage... */
 360 #define EXT4_DIRTY_FL                   0x00000100
 361 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 362 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 363         /* nb: was previously EXT2_ECOMPR_FL */
 364 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 365 /* End compression flags --- maybe not all used */
 366 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 367 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 368 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 369 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 370 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 371 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 372 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 373 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 374 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 375 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 376 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 377 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 378
 379 #define EXT4_FL_USER_VISIBLE            0x004BDFFF /* User visible flags */
 380 #define EXT4_FL_USER_MODIFIABLE         0x004380FF /* User modifiable flags */
 381
 382 /* Flags that should be inherited by new inodes from their parent. */
 383 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 384                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 385                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 386                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
 387
 388 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 389 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 390
 391 /* Flags that are appropriate for non-directories/regular files. */
 392 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 393
 394 /* Mask out flags that are inappropriate for the given type of inode. */
 395 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 396 {
 397         if (S_ISDIR(mode))
 398                 return flags;
 399         else if (S_ISREG(mode))
 400                 return flags & EXT4_REG_FLMASK;
 401         else
 402                 return flags & EXT4_OTHER_FLMASK;
 403 }
 404
 405 /*
 406  * Inode flags used for atomic set/get
 407  */
 408 enum {
 409         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 410         EXT4_INODE_UNRM         = 1,    /* Undelete */
 411         EXT4_INODE_COMPR        = 2,    /* Compress file */
 412         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 413         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 414         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 415         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 416         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 417 /* Reserved for compression usage... */
 418         EXT4_INODE_DIRTY        = 8,
 419         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 420         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 421         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 422 /* End compression flags --- maybe not all used */
 423         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 424         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 425         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 426         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 427         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 428         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 429         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 430         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 431         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 432         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 433         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 434         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 435 };
 436
 437 /*
 438  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 439  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 440  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 441  * any extra space in the compiled kernel image, otherwise, the build will fail.
 442  * It's important that these values are the same, since we are using
 443  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 444  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 445  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 446  * defined in e2fsprogs.
 447  *
 448  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 449  */
 450 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 451 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 452
 453 static inline void ext4_check_flag_values(void)
 454 {
 455         CHECK_FLAG_VALUE(SECRM);
 456         CHECK_FLAG_VALUE(UNRM);
 457         CHECK_FLAG_VALUE(COMPR);
 458         CHECK_FLAG_VALUE(SYNC);
 459         CHECK_FLAG_VALUE(IMMUTABLE);
 460         CHECK_FLAG_VALUE(APPEND);
 461         CHECK_FLAG_VALUE(NODUMP);
 462         CHECK_FLAG_VALUE(NOATIME);
 463         CHECK_FLAG_VALUE(DIRTY);
 464         CHECK_FLAG_VALUE(COMPRBLK);
 465         CHECK_FLAG_VALUE(NOCOMPR);
 466         CHECK_FLAG_VALUE(ENCRYPT);
 467         CHECK_FLAG_VALUE(INDEX);
 468         CHECK_FLAG_VALUE(IMAGIC);
 469         CHECK_FLAG_VALUE(JOURNAL_DATA);
 470         CHECK_FLAG_VALUE(NOTAIL);
 471         CHECK_FLAG_VALUE(DIRSYNC);
 472         CHECK_FLAG_VALUE(TOPDIR);
 473         CHECK_FLAG_VALUE(HUGE_FILE);
 474         CHECK_FLAG_VALUE(EXTENTS);
 475         CHECK_FLAG_VALUE(EA_INODE);
 476         CHECK_FLAG_VALUE(EOFBLOCKS);
 477         CHECK_FLAG_VALUE(INLINE_DATA);
 478         CHECK_FLAG_VALUE(RESERVED);
 479 }
 480
 481 /* Used to pass group descriptor data when online resize is done */
 482 struct ext4_new_group_input {
 483         __u32 group;            /* Group number for this data */
 484         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 485         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 486         __u64 inode_table;      /* Absolute block number of inode table start */
 487         __u32 blocks_count;     /* Total number of blocks in this group */
 488         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 489         __u16 unused;
 490 };
 491
 492 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 493 struct compat_ext4_new_group_input {
 494         u32 group;
 495         compat_u64 block_bitmap;
 496         compat_u64 inode_bitmap;
 497         compat_u64 inode_table;
 498         u32 blocks_count;
 499         u16 reserved_blocks;
 500         u16 unused;
 501 };
 502 #endif
 503
 504 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 505 struct ext4_new_group_data {
 506         __u32 group;
 507         __u64 block_bitmap;
 508         __u64 inode_bitmap;
 509         __u64 inode_table;
 510         __u32 blocks_count;
 511         __u16 reserved_blocks;
 512         __u16 unused;
 513         __u32 free_blocks_count;
 514 };
 515
 516 /* Indexes used to index group tables in ext4_new_group_data */
 517 enum {
 518         BLOCK_BITMAP = 0,       /* block bitmap */
 519         INODE_BITMAP,           /* inode bitmap */
 520         INODE_TABLE,            /* inode tables */
 521         GROUP_TABLE_COUNT,
 522 };
 523
 524 /*
 525  * Flags used by ext4_map_blocks()
 526  */
 527         /* Allocate any needed blocks and/or convert an unwritten
 528            extent to be an initialized ext4 */
 529 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 530         /* Request the creation of an unwritten extent */
 531 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 532 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 533                                                  EXT4_GET_BLOCKS_CREATE)
 534         /* Caller is from the delayed allocation writeout path
 535          * finally doing the actual allocation of delayed blocks */
 536 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 537         /* caller is from the direct IO path, request to creation of an
 538         unwritten extents if not allocated, split the unwritten
 539         extent if blocks has been preallocated already*/
 540 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 541 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 542 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 543                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 544         /* Convert extent to initialized after IO complete */
 545 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 546                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 547         /* Eventual metadata allocation (due to growing extent tree)
 548          * should not fail, so try to use reserved blocks for that.*/
 549 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 550         /* Don't normalize allocation size (used for fallocate) */
 551 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 552         /* Request will not result in inode size update (user for fallocate) */
 553 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 554         /* Do not take i_data_sem locking in ext4_map_blocks */
 555 #define EXT4_GET_BLOCKS_NO_LOCK                 0x0100
 556         /* Convert written extents to unwritten */
 557 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0200
 558
 559 /*
 560  * The bit position of these flags must not overlap with any of the
 561  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 562  * read_extent_tree_block(), ext4_split_extent_at(),
 563  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 564  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 565  * caching the extents when reading from the extent tree while a
 566  * truncate or punch hole operation is in progress.
 567  */
 568 #define EXT4_EX_NOCACHE                         0x40000000
 569 #define EXT4_EX_FORCE_CACHE                     0x20000000
 570
 571 /*
 572  * Flags used by ext4_free_blocks
 573  */
 574 #define EXT4_FREE_BLOCKS_METADATA       0x0001
 575 #define EXT4_FREE_BLOCKS_FORGET         0x0002
 576 #define EXT4_FREE_BLOCKS_VALIDATED      0x0004
 577 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
 578 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 579 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 580
 581 /* Encryption algorithms */
 582 #define EXT4_ENCRYPTION_MODE_INVALID            0
 583 #define EXT4_ENCRYPTION_MODE_AES_256_XTS        1
 584 #define EXT4_ENCRYPTION_MODE_AES_256_GCM        2
 585 #define EXT4_ENCRYPTION_MODE_AES_256_CBC        3
 586 #define EXT4_ENCRYPTION_MODE_AES_256_CTS        4
 587
 588 #include "ext4_crypto.h"
 589
 590 /*
 591  * ioctl commands
 592  */
 593 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 594 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 595 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 596 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 597 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 598 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 599 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 600 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 601 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 602 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 603 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 604  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 605  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 606 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 607 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 608 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 609 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 610 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 611 #define EXT4_IOC_SET_ENCRYPTION_POLICY  _IOR('f', 19, struct ext4_encryption_policy)
 612 #define EXT4_IOC_GET_ENCRYPTION_PWSALT  _IOW('f', 20, __u8[16])
 613 #define EXT4_IOC_GET_ENCRYPTION_POLICY  _IOW('f', 21, struct ext4_encryption_policy)
 614
 615 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 616 /*
 617  * ioctl commands in 32 bit emulation
 618  */
 619 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 620 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 621 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 622 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 623 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 624 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 625 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 626 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 627 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 628 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 629 #endif
 630
 631 /* Max physical block we can address w/o extents */
 632 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 633
 634 /*
 635  * Structure of an inode on the disk
 636  */
 637 struct ext4_inode {
 638         __le16  i_mode;         /* File mode */
 639         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 640         __le32  i_size_lo;      /* Size in bytes */
 641         __le32  i_atime;        /* Access time */
 642         __le32  i_ctime;        /* Inode Change time */
 643         __le32  i_mtime;        /* Modification time */
 644         __le32  i_dtime;        /* Deletion Time */
 645         __le16  i_gid;          /* Low 16 bits of Group Id */
 646         __le16  i_links_count;  /* Links count */
 647         __le32  i_blocks_lo;    /* Blocks count */
 648         __le32  i_flags;        /* File flags */
 649         union {
 650                 struct {
 651                         __le32  l_i_version;
 652                 } linux1;
 653                 struct {
 654                         __u32  h_i_translator;
 655                 } hurd1;
 656                 struct {
 657                         __u32  m_i_reserved1;
 658                 } masix1;
 659         } osd1;                         /* OS dependent 1 */
 660         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 661         __le32  i_generation;   /* File version (for NFS) */
 662         __le32  i_file_acl_lo;  /* File ACL */
 663         __le32  i_size_high;
 664         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 665         union {
 666                 struct {
 667                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 668                         __le16  l_i_file_acl_high;
 669                         __le16  l_i_uid_high;   /* these 2 fields */
 670                         __le16  l_i_gid_high;   /* were reserved2[0] */
 671                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 672                         __le16  l_i_reserved;
 673                 } linux2;
 674                 struct {
 675                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 676                         __u16   h_i_mode_high;
 677                         __u16   h_i_uid_high;
 678                         __u16   h_i_gid_high;
 679                         __u32   h_i_author;
 680                 } hurd2;
 681                 struct {
 682                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 683                         __le16  m_i_file_acl_high;
 684                         __u32   m_i_reserved2[2];
 685                 } masix2;
 686         } osd2;                         /* OS dependent 2 */
 687         __le16  i_extra_isize;
 688         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 689         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 690         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 691         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 692         __le32  i_crtime;       /* File Creation time */
 693         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 694         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 695 };
 696
 697 struct move_extent {
 698         __u32 reserved;         /* should be zero */
 699         __u32 donor_fd;         /* donor file descriptor */
 700         __u64 orig_start;       /* logical start offset in block for orig */
 701         __u64 donor_start;      /* logical start offset in block for donor */
 702         __u64 len;              /* block length to be moved */
 703         __u64 moved_len;        /* moved block length */
 704 };
 705
 706 #define EXT4_EPOCH_BITS 2
 707 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 708 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 709
 710 /*
 711  * Extended fields will fit into an inode if the filesystem was formatted
 712  * with large inodes (-I 256 or larger) and there are not currently any EAs
 713  * consuming all of the available space. For new inodes we always reserve
 714  * enough space for the kernel's known extended fields, but for inodes
 715  * created with an old kernel this might not have been the case. None of
 716  * the extended inode fields is critical for correct filesystem operation.
 717  * This macro checks if a certain field fits in the inode. Note that
 718  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 719  */
 720 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 721         ((offsetof(typeof(*ext4_inode), field) +        \
 722           sizeof((ext4_inode)->field))                  \
 723         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 724             (einode)->i_extra_isize))                   \
 725
 726 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 727 {
 728        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 729                            (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
 730                           ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
 731 }
 732
 733 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 734 {
 735        if (sizeof(time->tv_sec) > 4)
 736                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 737                                << 32;
 738        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 739 }
 740
 741 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 742 do {                                                                           \
 743         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 744         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 745                 (raw_inode)->xtime ## _extra =                                 \
 746                                 ext4_encode_extra_time(&(inode)->xtime);       \
 747 } while (0)
 748
 749 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 750 do {                                                                           \
 751         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 752                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 753         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 754                 (raw_inode)->xtime ## _extra =                                 \
 755                                 ext4_encode_extra_time(&(einode)->xtime);      \
 756 } while (0)
 757
 758 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 759 do {                                                                           \
 760         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 761         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 762                 ext4_decode_extra_time(&(inode)->xtime,                        \
 763                                        raw_inode->xtime ## _extra);            \
 764         else                                                                   \
 765                 (inode)->xtime.tv_nsec = 0;                                    \
 766 } while (0)
 767
 768 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 769 do {                                                                           \
 770         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 771                 (einode)->xtime.tv_sec =                                       \
 772                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 773         else                                                                   \
 774                 (einode)->xtime.tv_sec = 0;                                    \
 775         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 776                 ext4_decode_extra_time(&(einode)->xtime,                       \
 777                                        raw_inode->xtime ## _extra);            \
 778         else                                                                   \
 779                 (einode)->xtime.tv_nsec = 0;                                   \
 780 } while (0)
 781
 782 #define i_disk_version osd1.linux1.l_i_version
 783
 784 #if defined(__KERNEL__) || defined(__linux__)
 785 #define i_reserved1     osd1.linux1.l_i_reserved1
 786 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 787 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 788 #define i_uid_low       i_uid
 789 #define i_gid_low       i_gid
 790 #define i_uid_high      osd2.linux2.l_i_uid_high
 791 #define i_gid_high      osd2.linux2.l_i_gid_high
 792 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 793
 794 #elif defined(__GNU__)
 795
 796 #define i_translator    osd1.hurd1.h_i_translator
 797 #define i_uid_high      osd2.hurd2.h_i_uid_high
 798 #define i_gid_high      osd2.hurd2.h_i_gid_high
 799 #define i_author        osd2.hurd2.h_i_author
 800
 801 #elif defined(__masix__)
 802
 803 #define i_reserved1     osd1.masix1.m_i_reserved1
 804 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 805 #define i_reserved2     osd2.masix2.m_i_reserved2
 806
 807 #endif /* defined(__KERNEL__) || defined(__linux__) */
 808
 809 #include "extents_status.h"
 810
 811 /*
 812  * fourth extended file system inode data in memory
 813  */
 814 struct ext4_inode_info {
 815         __le32  i_data[15];     /* unconverted */
 816         __u32   i_dtime;
 817         ext4_fsblk_t    i_file_acl;
 818
 819         /*
 820          * i_block_group is the number of the block group which contains
 821          * this file's inode.  Constant across the lifetime of the inode,
 822          * it is ued for making block allocation decisions - we try to
 823          * place a file's data blocks near its inode block, and new inodes
 824          * near to their parent directory's inode.
 825          */
 826         ext4_group_t    i_block_group;
 827         ext4_lblk_t     i_dir_start_lookup;
 828 #if (BITS_PER_LONG < 64)
 829         unsigned long   i_state_flags;          /* Dynamic state flags */
 830 #endif
 831         unsigned long   i_flags;
 832
 833         /*
 834          * Extended attributes can be read independently of the main file
 835          * data. Taking i_mutex even when reading would cause contention
 836          * between readers of EAs and writers of regular file data, so
 837          * instead we synchronize on xattr_sem when reading or changing
 838          * EAs.
 839          */
 840         struct rw_semaphore xattr_sem;
 841
 842         struct list_head i_orphan;      /* unlinked but open inodes */
 843
 844         /*
 845          * i_disksize keeps track of what the inode size is ON DISK, not
 846          * in memory.  During truncate, i_size is set to the new size by
 847          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 848          * set i_disksize to 0 until the truncate is actually under way.
 849          *
 850          * The intent is that i_disksize always represents the blocks which
 851          * are used by this file.  This allows recovery to restart truncate
 852          * on orphans if we crash during truncate.  We actually write i_disksize
 853          * into the on-disk inode when writing inodes out, instead of i_size.
 854          *
 855          * The only time when i_disksize and i_size may be different is when
 856          * a truncate is in progress.  The only things which change i_disksize
 857          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 858          */
 859         loff_t  i_disksize;
 860
 861         /*
 862          * i_data_sem is for serialising ext4_truncate() against
 863          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 864          * data tree are chopped off during truncate. We can't do that in
 865          * ext4 because whenever we perform intermediate commits during
 866          * truncate, the inode and all the metadata blocks *must* be in a
 867          * consistent state which allows truncation of the orphans to restart
 868          * during recovery.  Hence we must fix the get_block-vs-truncate race
 869          * by other means, so we have i_data_sem.
 870          */
 871         struct rw_semaphore i_data_sem;
 872         struct inode vfs_inode;
 873         struct jbd2_inode *jinode;
 874
 875         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
 876
 877         /*
 878          * File creation time. Its function is same as that of
 879          * struct timespec i_{a,c,m}time in the generic inode.
 880          */
 881         struct timespec i_crtime;
 882
 883         /* mballoc */
 884         struct list_head i_prealloc_list;
 885         spinlock_t i_prealloc_lock;
 886
 887         /* extents status tree */
 888         struct ext4_es_tree i_es_tree;
 889         rwlock_t i_es_lock;
 890         struct list_head i_es_list;
 891         unsigned int i_es_all_nr;       /* protected by i_es_lock */
 892         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
 893         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
 894                                            extents to shrink. Protected by
 895                                            i_es_lock  */
 896
 897         /* ialloc */
 898         ext4_group_t    i_last_alloc_group;
 899
 900         /* allocation reservation info for delalloc */
 901         /* In case of bigalloc, these refer to clusters rather than blocks */
 902         unsigned int i_reserved_data_blocks;
 903         unsigned int i_reserved_meta_blocks;
 904         unsigned int i_allocated_meta_blocks;
 905         ext4_lblk_t i_da_metadata_calc_last_lblock;
 906         int i_da_metadata_calc_len;
 907
 908         /* on-disk additional length */
 909         __u16 i_extra_isize;
 910
 911         /* Indicate the inline data space. */
 912         u16 i_inline_off;
 913         u16 i_inline_size;
 914
 915 #ifdef CONFIG_QUOTA
 916         /* quota space reservation, managed internally by quota code */
 917         qsize_t i_reserved_quota;
 918 #endif
 919
 920         /* Lock protecting lists below */
 921         spinlock_t i_completed_io_lock;
 922         /*
 923          * Completed IOs that need unwritten extents handling and have
 924          * transaction reserved
 925          */
 926         struct list_head i_rsv_conversion_list;
 927         /*
 928          * Completed IOs that need unwritten extents handling and don't have
 929          * transaction reserved
 930          */
 931         atomic_t i_ioend_count; /* Number of outstanding io_end structs */
 932         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
 933         struct work_struct i_rsv_conversion_work;
 934
 935         spinlock_t i_block_reservation_lock;
 936
 937         /*
 938          * Transactions that contain inode's metadata needed to complete
 939          * fsync and fdatasync, respectively.
 940          */
 941         tid_t i_sync_tid;
 942         tid_t i_datasync_tid;
 943
 944 #ifdef CONFIG_QUOTA
 945         struct dquot *i_dquot[MAXQUOTAS];
 946 #endif
 947
 948         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
 949         __u32 i_csum_seed;
 950
 951 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 952         /* Encryption params */
 953         struct ext4_crypt_info *i_crypt_info;
 954 #endif
 955 };
 956
 957 /*
 958  * File system states
 959  */
 960 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 961 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 962 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 963
 964 /*
 965  * Misc. filesystem flags
 966  */
 967 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 968 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 969 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 970
 971 /*
 972  * Mount flags set via mount options or defaults
 973  */
 974 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 975 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 976 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 977 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 978 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 979 #define EXT4_MOUNT_ERRORS_MASK          0x00070
 980 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 981 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 982 #ifdef CONFIG_FS_DAX
 983 #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
 984 #else
 985 #define EXT4_MOUNT_DAX                  0
 986 #endif
 987 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 988 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 989 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 990 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 991 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 992 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 993 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 994 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 995 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
 996 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 997 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 998 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 999 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
1000 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1001 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1002 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1003 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1004 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1005 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1006 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1007 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1008
1009 /*
1010  * Mount flags set either automatically (could not be set by mount option)
1011  * based on per file system feature or property or in special cases such as
1012  * distinguishing between explicit mount option definition and default.
1013  */
1014 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1015                                                       specified delalloc */
1016 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1017                                                       size of blocksize * 8
1018                                                       blocks */
1019 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1020                                                       file systems */
1021
1022 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1023                                                 ~EXT4_MOUNT_##opt
1024 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1025                                                 EXT4_MOUNT_##opt
1026 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1027                                          EXT4_MOUNT_##opt)
1028
1029 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1030                                                 ~EXT4_MOUNT2_##opt
1031 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1032                                                 EXT4_MOUNT2_##opt
1033 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1034                                          EXT4_MOUNT2_##opt)
1035
1036 #define ext4_test_and_set_bit           __test_and_set_bit_le
1037 #define ext4_set_bit                    __set_bit_le
1038 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1039 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1040 #define ext4_clear_bit                  __clear_bit_le
1041 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1042 #define ext4_test_bit                   test_bit_le
1043 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1044 #define ext4_find_next_bit              find_next_bit_le
1045
1046 extern void ext4_set_bits(void *bm, int cur, int len);
1047
1048 /*
1049  * Maximal mount counts between two filesystem checks
1050  */
1051 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1052 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1053
1054 /*
1055  * Behaviour when detecting errors
1056  */
1057 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1058 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1059 #define EXT4_ERRORS_PANIC               3       /* Panic */
1060 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1061
1062 /* Metadata checksum algorithm codes */
1063 #define EXT4_CRC32C_CHKSUM              1
1064
1065 /*
1066  * Structure of the super block
1067  */
1068 struct ext4_super_block {
1069 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1070         __le32  s_blocks_count_lo;      /* Blocks count */
1071         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1072         __le32  s_free_blocks_count_lo; /* Free blocks count */
1073 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1074         __le32  s_first_data_block;     /* First Data Block */
1075         __le32  s_log_block_size;       /* Block size */
1076         __le32  s_log_cluster_size;     /* Allocation cluster size */
1077 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1078         __le32  s_clusters_per_group;   /* # Clusters per group */
1079         __le32  s_inodes_per_group;     /* # Inodes per group */
1080         __le32  s_mtime;                /* Mount time */
1081 /*30*/  __le32  s_wtime;                /* Write time */
1082         __le16  s_mnt_count;            /* Mount count */
1083         __le16  s_max_mnt_count;        /* Maximal mount count */
1084         __le16  s_magic;                /* Magic signature */
1085         __le16  s_state;                /* File system state */
1086         __le16  s_errors;               /* Behaviour when detecting errors */
1087         __le16  s_minor_rev_level;      /* minor revision level */
1088 /*40*/  __le32  s_lastcheck;            /* time of last check */
1089         __le32  s_checkinterval;        /* max. time between checks */
1090         __le32  s_creator_os;           /* OS */
1091         __le32  s_rev_level;            /* Revision level */
1092 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1093         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1094         /*
1095          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1096          *
1097          * Note: the difference between the compatible feature set and
1098          * the incompatible feature set is that if there is a bit set
1099          * in the incompatible feature set that the kernel doesn't
1100          * know about, it should refuse to mount the filesystem.
1101          *
1102          * e2fsck's requirements are more strict; if it doesn't know
1103          * about a feature in either the compatible or incompatible
1104          * feature set, it must abort and not try to meddle with
1105          * things it doesn't understand...
1106          */
1107         __le32  s_first_ino;            /* First non-reserved inode */
1108         __le16  s_inode_size;           /* size of inode structure */
1109         __le16  s_block_group_nr;       /* block group # of this superblock */
1110         __le32  s_feature_compat;       /* compatible feature set */
1111 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1112         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1113 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1114 /*78*/  char    s_volume_name[16];      /* volume name */
1115 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
1116 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1117         /*
1118          * Performance hints.  Directory preallocation should only
1119          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1120          */
1121         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1122         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1123         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1124         /*
1125          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1126          */
1127 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1128 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1129         __le32  s_journal_dev;          /* device number of journal file */
1130         __le32  s_last_orphan;          /* start of list of inodes to delete */
1131         __le32  s_hash_seed[4];         /* HTREE hash seed */
1132         __u8    s_def_hash_version;     /* Default hash version to use */
1133         __u8    s_jnl_backup_type;
1134         __le16  s_desc_size;            /* size of group descriptor */
1135 /*100*/ __le32  s_default_mount_opts;
1136         __le32  s_first_meta_bg;        /* First metablock block group */
1137         __le32  s_mkfs_time;            /* When the filesystem was created */
1138         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1139         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1140 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1141         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1142         __le32  s_free_blocks_count_hi; /* Free blocks count */
1143         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1144         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1145         __le32  s_flags;                /* Miscellaneous flags */
1146         __le16  s_raid_stride;          /* RAID stride */
1147         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1148         __le64  s_mmp_block;            /* Block for multi-mount protection */
1149         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1150         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1151         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1152         __u8    s_encryption_level;     /* versioning level for encryption */
1153         __u8    s_reserved_pad;         /* Padding to next 32bits */
1154         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1155         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1156         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1157         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1158                                               snapshot's future use */
1159         __le32  s_snapshot_list;        /* inode number of the head of the
1160                                            on-disk snapshot list */
1161 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1162         __le32  s_error_count;          /* number of fs errors */
1163         __le32  s_first_error_time;     /* first time an error happened */
1164         __le32  s_first_error_ino;      /* inode involved in first error */
1165         __le64  s_first_error_block;    /* block involved of first error */
1166         __u8    s_first_error_func[32]; /* function where the error happened */
1167         __le32  s_first_error_line;     /* line number where error happened */
1168         __le32  s_last_error_time;      /* most recent time of an error */
1169         __le32  s_last_error_ino;       /* inode involved in last error */
1170         __le32  s_last_error_line;      /* line number where error happened */
1171         __le64  s_last_error_block;     /* block involved of last error */
1172         __u8    s_last_error_func[32];  /* function where the error happened */
1173 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1174         __u8    s_mount_opts[64];
1175         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1176         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1177         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1178         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1179         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1180         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1181         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1182         __le32  s_reserved[100];        /* Padding to the end of the block */
1183         __le32  s_checksum;             /* crc32c(superblock) */
1184 };
1185
1186 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1187
1188 #ifdef __KERNEL__
1189
1190 /*
1191  * run-time mount flags
1192  */
1193 #define EXT4_MF_MNTDIR_SAMPLED          0x0001
1194 #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
1195 #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
1196
1197 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1198 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1199                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1200 #else
1201 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1202 #endif
1203
1204 /* Number of quota types we support */
1205 #define EXT4_MAXQUOTAS 2
1206
1207 /*
1208  * fourth extended-fs super-block data in memory
1209  */
1210 struct ext4_sb_info {
1211         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1212         unsigned long s_inodes_per_block;/* Number of inodes per block */
1213         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1214         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1215         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1216         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1217         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1218         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1219         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1220         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1221         unsigned long s_overhead;  /* # of fs overhead clusters */
1222         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1223         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1224         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1225         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1226         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1227         struct buffer_head **s_group_desc;
1228         unsigned int s_mount_opt;
1229         unsigned int s_mount_opt2;
1230         unsigned int s_mount_flags;
1231         unsigned int s_def_mount_opt;
1232         ext4_fsblk_t s_sb_block;
1233         atomic64_t s_resv_clusters;
1234         kuid_t s_resuid;
1235         kgid_t s_resgid;
1236         unsigned short s_mount_state;
1237         unsigned short s_pad;
1238         int s_addr_per_block_bits;
1239         int s_desc_per_block_bits;
1240         int s_inode_size;
1241         int s_first_ino;
1242         unsigned int s_inode_readahead_blks;
1243         unsigned int s_inode_goal;
1244         spinlock_t s_next_gen_lock;
1245         u32 s_next_generation;
1246         u32 s_hash_seed[4];
1247         int s_def_hash_version;
1248         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1249         struct percpu_counter s_freeclusters_counter;
1250         struct percpu_counter s_freeinodes_counter;
1251         struct percpu_counter s_dirs_counter;
1252         struct percpu_counter s_dirtyclusters_counter;
1253         struct blockgroup_lock *s_blockgroup_lock;
1254         struct proc_dir_entry *s_proc;
1255         struct kobject s_kobj;
1256         struct completion s_kobj_unregister;
1257         struct super_block *s_sb;
1258
1259         /* Journaling */
1260         struct journal_s *s_journal;
1261         struct list_head s_orphan;
1262         struct mutex s_orphan_lock;
1263         unsigned long s_resize_flags;           /* Flags indicating if there
1264                                                    is a resizer */
1265         unsigned long s_commit_interval;
1266         u32 s_max_batch_time;
1267         u32 s_min_batch_time;
1268         struct block_device *journal_bdev;
1269 #ifdef CONFIG_QUOTA
1270         char *s_qf_names[EXT4_MAXQUOTAS];       /* Names of quota files with journalled quota */
1271         int s_jquota_fmt;                       /* Format of quota to use */
1272 #endif
1273         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1274         struct rb_root system_blks;
1275
1276 #ifdef EXTENTS_STATS
1277         /* ext4 extents stats */
1278         unsigned long s_ext_min;
1279         unsigned long s_ext_max;
1280         unsigned long s_depth_max;
1281         spinlock_t s_ext_stats_lock;
1282         unsigned long s_ext_blocks;
1283         unsigned long s_ext_extents;
1284 #endif
1285
1286         /* for buddy allocator */
1287         struct ext4_group_info ***s_group_info;
1288         struct inode *s_buddy_cache;
1289         spinlock_t s_md_lock;
1290         unsigned short *s_mb_offsets;
1291         unsigned int *s_mb_maxs;
1292         unsigned int s_group_info_size;
1293
1294         /* tunables */
1295         unsigned long s_stripe;
1296         unsigned int s_mb_stream_request;
1297         unsigned int s_mb_max_to_scan;
1298         unsigned int s_mb_min_to_scan;
1299         unsigned int s_mb_stats;
1300         unsigned int s_mb_order2_reqs;
1301         unsigned int s_mb_group_prealloc;
1302         unsigned int s_max_dir_size_kb;
1303         /* where last allocation was done - for stream allocation */
1304         unsigned long s_mb_last_group;
1305         unsigned long s_mb_last_start;
1306
1307         /* stats for buddy allocator */
1308         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1309         atomic_t s_bal_success; /* we found long enough chunks */
1310         atomic_t s_bal_allocated;       /* in blocks */
1311         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1312         atomic_t s_bal_goals;   /* goal hits */
1313         atomic_t s_bal_breaks;  /* too long searches */
1314         atomic_t s_bal_2orders; /* 2^order hits */
1315         spinlock_t s_bal_lock;
1316         unsigned long s_mb_buddies_generated;
1317         unsigned long long s_mb_generation_time;
1318         atomic_t s_mb_lost_chunks;
1319         atomic_t s_mb_preallocated;
1320         atomic_t s_mb_discarded;
1321         atomic_t s_lock_busy;
1322
1323         /* locality groups */
1324         struct ext4_locality_group __percpu *s_locality_groups;
1325
1326         /* for write statistics */
1327         unsigned long s_sectors_written_start;
1328         u64 s_kbytes_written;
1329
1330         /* the size of zero-out chunk */
1331         unsigned int s_extent_max_zeroout_kb;
1332
1333         unsigned int s_log_groups_per_flex;
1334         struct flex_groups *s_flex_groups;
1335         ext4_group_t s_flex_groups_allocated;
1336
1337         /* workqueue for reserved extent conversions (buffered io) */
1338         struct workqueue_struct *rsv_conversion_wq;
1339
1340         /* timer for periodic error stats printing */
1341         struct timer_list s_err_report;
1342
1343         /* Lazy inode table initialization info */
1344         struct ext4_li_request *s_li_request;
1345         /* Wait multiplier for lazy initialization thread */
1346         unsigned int s_li_wait_mult;
1347
1348         /* Kernel thread for multiple mount protection */
1349         struct task_struct *s_mmp_tsk;
1350
1351         /* record the last minlen when FITRIM is called. */
1352         atomic_t s_last_trim_minblks;
1353
1354         /* Reference to checksum algorithm driver via cryptoapi */
1355         struct crypto_shash *s_chksum_driver;
1356
1357         /* Precomputed FS UUID checksum for seeding other checksums */
1358         __u32 s_csum_seed;
1359
1360         /* Reclaim extents from extent status tree */
1361         struct shrinker s_es_shrinker;
1362         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1363         long s_es_nr_inode;
1364         struct ext4_es_stats s_es_stats;
1365         struct mb_cache *s_mb_cache;
1366         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1367
1368         /* Ratelimit ext4 messages. */
1369         struct ratelimit_state s_err_ratelimit_state;
1370         struct ratelimit_state s_warning_ratelimit_state;
1371         struct ratelimit_state s_msg_ratelimit_state;
1372 };
1373
1374 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1375 {
1376         return sb->s_fs_info;
1377 }
1378 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1379 {
1380         return container_of(inode, struct ext4_inode_info, vfs_inode);
1381 }
1382
1383 static inline struct timespec ext4_current_time(struct inode *inode)
1384 {
1385         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1386                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1387 }
1388
1389 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1390 {
1391         return ino == EXT4_ROOT_INO ||
1392                 ino == EXT4_USR_QUOTA_INO ||
1393                 ino == EXT4_GRP_QUOTA_INO ||
1394                 ino == EXT4_BOOT_LOADER_INO ||
1395                 ino == EXT4_JOURNAL_INO ||
1396                 ino == EXT4_RESIZE_INO ||
1397                 (ino >= EXT4_FIRST_INO(sb) &&
1398                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1399 }
1400
1401 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1402                                               struct ext4_io_end *io_end)
1403 {
1404         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1405                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1406                 atomic_inc(&EXT4_I(inode)->i_unwritten);
1407         }
1408 }
1409
1410 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1411 {
1412         return inode->i_private;
1413 }
1414
1415 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1416 {
1417         inode->i_private = io;
1418 }
1419
1420 /*
1421  * Inode dynamic state flags
1422  */
1423 enum {
1424         EXT4_STATE_JDATA,               /* journaled data exists */
1425         EXT4_STATE_NEW,                 /* inode is newly created */
1426         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1427         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1428         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1429         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1430         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1431         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1432         EXT4_STATE_DIOREAD_LOCK,        /* Disable support for dio read
1433                                            nolocking */
1434         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1435         EXT4_STATE_ORDERED_MODE,        /* data=ordered mode */
1436         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1437 };
1438
1439 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1440 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1441 {                                                                       \
1442         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1443 }                                                                       \
1444 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1445 {                                                                       \
1446         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1447 }                                                                       \
1448 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1449 {                                                                       \
1450         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1451 }
1452
1453 /* Add these declarations here only so that these functions can be
1454  * found by name.  Otherwise, they are very hard to locate. */
1455 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1456 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1457 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1458 EXT4_INODE_BIT_FNS(flag, flags, 0)
1459
1460 /* Add these declarations here only so that these functions can be
1461  * found by name.  Otherwise, they are very hard to locate. */
1462 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1463 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1464 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1465 #if (BITS_PER_LONG < 64)
1466 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1467
1468 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1469 {
1470         (ei)->i_state_flags = 0;
1471 }
1472 #else
1473 EXT4_INODE_BIT_FNS(state, flags, 32)
1474
1475 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1476 {
1477         /* We depend on the fact that callers will set i_flags */
1478 }
1479 #endif
1480 #else
1481 /* Assume that user mode programs are passing in an ext4fs superblock, not
1482  * a kernel struct super_block.  This will allow us to call the feature-test
1483  * macros from user land. */
1484 #define EXT4_SB(sb)     (sb)
1485 #endif
1486
1487 /*
1488  * Returns true if the inode is inode is encrypted
1489  */
1490 static inline int ext4_encrypted_inode(struct inode *inode)
1491 {
1492 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1493         return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1494 #else
1495         return 0;
1496 #endif
1497 }
1498
1499 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1500
1501 /*
1502  * Codes for operating systems
1503  */
1504 #define EXT4_OS_LINUX           0
1505 #define EXT4_OS_HURD            1
1506 #define EXT4_OS_MASIX           2
1507 #define EXT4_OS_FREEBSD         3
1508 #define EXT4_OS_LITES           4
1509
1510 /*
1511  * Revision levels
1512  */
1513 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1514 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1515
1516 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1517 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1518
1519 #define EXT4_GOOD_OLD_INODE_SIZE 128
1520
1521 /*
1522  * Feature set definitions
1523  */
1524
1525 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
1526         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1527 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
1528         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1529 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
1530         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1531 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
1532         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1533 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
1534         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1535 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
1536         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1537 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
1538         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1539 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
1540         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1541 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
1542         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1543
1544 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1545 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1546 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1547 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1548 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1549 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1550 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1551
1552 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1553 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1554 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1555 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1556 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1557 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1558 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1559 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1560 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1561 /*
1562  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
1563  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1564  * all other data structures' checksums.  However, the METADATA_CSUM and
1565  * GDT_CSUM bits are mutually exclusive.
1566  */
1567 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1568 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
1569
1570 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1571 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1572 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1573 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1574 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1575 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1576 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1577 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1578 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1579 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1580 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1581 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM  0x2000 /* use crc32c for bg */
1582 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1583 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
1584 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
1585
1586 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1587 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1588                                          EXT4_FEATURE_INCOMPAT_META_BG)
1589 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1590                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1591                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1592
1593 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1594 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1595                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1596                                          EXT4_FEATURE_INCOMPAT_META_BG)
1597 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1598                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1599                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1600
1601 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
1602 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1603                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1604                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1605                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1606                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1607                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1608                                          EXT4_FEATURE_INCOMPAT_MMP | \
1609                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1610                                          EXT4_FEATURE_INCOMPAT_ENCRYPT)
1611 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1612                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1613                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1614                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1615                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1616                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1617                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1618                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1619                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1620                                          EXT4_FEATURE_RO_COMPAT_QUOTA)
1621
1622 /*
1623  * Default values for user and/or group using reserved blocks
1624  */
1625 #define EXT4_DEF_RESUID         0
1626 #define EXT4_DEF_RESGID         0
1627
1628 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1629
1630 /*
1631  * Default mount options
1632  */
1633 #define EXT4_DEFM_DEBUG         0x0001
1634 #define EXT4_DEFM_BSDGROUPS     0x0002
1635 #define EXT4_DEFM_XATTR_USER    0x0004
1636 #define EXT4_DEFM_ACL           0x0008
1637 #define EXT4_DEFM_UID16         0x0010
1638 #define EXT4_DEFM_JMODE         0x0060
1639 #define EXT4_DEFM_JMODE_DATA    0x0020
1640 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1641 #define EXT4_DEFM_JMODE_WBACK   0x0060
1642 #define EXT4_DEFM_NOBARRIER     0x0100
1643 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1644 #define EXT4_DEFM_DISCARD       0x0400
1645 #define EXT4_DEFM_NODELALLOC    0x0800
1646
1647 /*
1648  * Default journal batch times
1649  */
1650 #define EXT4_DEF_MIN_BATCH_TIME 0
1651 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1652
1653 /*
1654  * Minimum number of groups in a flexgroup before we separate out
1655  * directories into the first block group of a flexgroup
1656  */
1657 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1658
1659 /*
1660  * Structure of a directory entry
1661  */
1662 #define EXT4_NAME_LEN 255
1663
1664 struct ext4_dir_entry {
1665         __le32  inode;                  /* Inode number */
1666         __le16  rec_len;                /* Directory entry length */
1667         __le16  name_len;               /* Name length */
1668         char    name[EXT4_NAME_LEN];    /* File name */
1669 };
1670
1671 /*
1672  * The new version of the directory entry.  Since EXT4 structures are
1673  * stored in intel byte order, and the name_len field could never be
1674  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1675  * file_type field.
1676  */
1677 struct ext4_dir_entry_2 {
1678         __le32  inode;                  /* Inode number */
1679         __le16  rec_len;                /* Directory entry length */
1680         __u8    name_len;               /* Name length */
1681         __u8    file_type;
1682         char    name[EXT4_NAME_LEN];    /* File name */
1683 };
1684
1685 /*
1686  * This is a bogus directory entry at the end of each leaf block that
1687  * records checksums.
1688  */
1689 struct ext4_dir_entry_tail {
1690         __le32  det_reserved_zero1;     /* Pretend to be unused */
1691         __le16  det_rec_len;            /* 12 */
1692         __u8    det_reserved_zero2;     /* Zero name length */
1693         __u8    det_reserved_ft;        /* 0xDE, fake file type */
1694         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
1695 };
1696
1697 #define EXT4_DIRENT_TAIL(block, blocksize) \
1698         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1699                                         ((blocksize) - \
1700                                          sizeof(struct ext4_dir_entry_tail))))
1701
1702 /*
1703  * Ext4 directory file types.  Only the low 3 bits are used.  The
1704  * other bits are reserved for now.
1705  */
1706 #define EXT4_FT_UNKNOWN         0
1707 #define EXT4_FT_REG_FILE        1
1708 #define EXT4_FT_DIR             2
1709 #define EXT4_FT_CHRDEV          3
1710 #define EXT4_FT_BLKDEV          4
1711 #define EXT4_FT_FIFO            5
1712 #define EXT4_FT_SOCK            6
1713 #define EXT4_FT_SYMLINK         7
1714
1715 #define EXT4_FT_MAX             8
1716
1717 #define EXT4_FT_DIR_CSUM        0xDE
1718
1719 /*
1720  * EXT4_DIR_PAD defines the directory entries boundaries
1721  *
1722  * NOTE: It must be a multiple of 4
1723  */
1724 #define EXT4_DIR_PAD                    4
1725 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1726 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1727                                          ~EXT4_DIR_ROUND)
1728 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1729
1730 /*
1731  * If we ever get support for fs block sizes > page_size, we'll need
1732  * to remove the #if statements in the next two functions...
1733  */
1734 static inline unsigned int
1735 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1736 {
1737         unsigned len = le16_to_cpu(dlen);
1738
1739 #if (PAGE_CACHE_SIZE >= 65536)
1740         if (len == EXT4_MAX_REC_LEN || len == 0)
1741                 return blocksize;
1742         return (len & 65532) | ((len & 3) << 16);
1743 #else
1744         return len;
1745 #endif
1746 }
1747
1748 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1749 {
1750         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1751                 BUG();
1752 #if (PAGE_CACHE_SIZE >= 65536)
1753         if (len < 65536)
1754                 return cpu_to_le16(len);
1755         if (len == blocksize) {
1756                 if (blocksize == 65536)
1757                         return cpu_to_le16(EXT4_MAX_REC_LEN);
1758                 else
1759                         return cpu_to_le16(0);
1760         }
1761         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1762 #else
1763         return cpu_to_le16(len);
1764 #endif
1765 }
1766
1767 /*
1768  * Hash Tree Directory indexing
1769  * (c) Daniel Phillips, 2001
1770  */
1771
1772 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1773                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1774                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1775 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1776 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1777
1778 /* Legal values for the dx_root hash_version field: */
1779
1780 #define DX_HASH_LEGACY          0
1781 #define DX_HASH_HALF_MD4        1
1782 #define DX_HASH_TEA             2
1783 #define DX_HASH_LEGACY_UNSIGNED 3
1784 #define DX_HASH_HALF_MD4_UNSIGNED       4
1785 #define DX_HASH_TEA_UNSIGNED            5
1786
1787 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1788                               const void *address, unsigned int length)
1789 {
1790         struct {
1791                 struct shash_desc shash;
1792                 char ctx[4];
1793         } desc;
1794         int err;
1795
1796         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1797
1798         desc.shash.tfm = sbi->s_chksum_driver;
1799         desc.shash.flags = 0;
1800         *(u32 *)desc.ctx = crc;
1801
1802         err = crypto_shash_update(&desc.shash, address, length);
1803         BUG_ON(err);
1804
1805         return *(u32 *)desc.ctx;
1806 }
1807
1808 #ifdef __KERNEL__
1809
1810 /* hash info structure used by the directory hash */
1811 struct dx_hash_info
1812 {
1813         u32             hash;
1814         u32             minor_hash;
1815         int             hash_version;
1816         u32             *seed;
1817 };
1818
1819
1820 /* 32 and 64 bit signed EOF for dx directories */
1821 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
1822 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
1823
1824
1825 /*
1826  * Control parameters used by ext4_htree_next_block
1827  */
1828 #define HASH_NB_ALWAYS          1
1829
1830 struct ext4_filename {
1831         const struct qstr *usr_fname;
1832         struct ext4_str disk_name;
1833         struct dx_hash_info hinfo;
1834 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1835         struct ext4_str crypto_buf;
1836 #endif
1837 };
1838
1839 #define fname_name(p) ((p)->disk_name.name)
1840 #define fname_len(p)  ((p)->disk_name.len)
1841
1842 /*
1843  * Describe an inode's exact location on disk and in memory
1844  */
1845 struct ext4_iloc
1846 {
1847         struct buffer_head *bh;
1848         unsigned long offset;
1849         ext4_group_t block_group;
1850 };
1851
1852 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1853 {
1854         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1855 }
1856
1857 /*
1858  * This structure is stuffed into the struct file's private_data field
1859  * for directories.  It is where we put information so that we can do
1860  * readdir operations in hash tree order.
1861  */
1862 struct dir_private_info {
1863         struct rb_root  root;
1864         struct rb_node  *curr_node;
1865         struct fname    *extra_fname;
1866         loff_t          last_pos;
1867         __u32           curr_hash;
1868         __u32           curr_minor_hash;
1869         __u32           next_hash;
1870 };
1871
1872 /* calculate the first block number of the group */
1873 static inline ext4_fsblk_t
1874 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1875 {
1876         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1877                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1878 }
1879
1880 /*
1881  * Special error return code only used by dx_probe() and its callers.
1882  */
1883 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
1884
1885 /*
1886  * Timeout and state flag for lazy initialization inode thread.
1887  */
1888 #define EXT4_DEF_LI_WAIT_MULT                   10
1889 #define EXT4_DEF_LI_MAX_START_DELAY             5
1890 #define EXT4_LAZYINIT_QUIT                      0x0001
1891 #define EXT4_LAZYINIT_RUNNING                   0x0002
1892
1893 /*
1894  * Lazy inode table initialization info
1895  */
1896 struct ext4_lazy_init {
1897         unsigned long           li_state;
1898         struct list_head        li_request_list;
1899         struct mutex            li_list_mtx;
1900 };
1901
1902 struct ext4_li_request {
1903         struct super_block      *lr_super;
1904         struct ext4_sb_info     *lr_sbi;
1905         ext4_group_t            lr_next_group;
1906         struct list_head        lr_request;
1907         unsigned long           lr_next_sched;
1908         unsigned long           lr_timeout;
1909 };
1910
1911 struct ext4_features {
1912         struct kobject f_kobj;
1913         struct completion f_kobj_unregister;
1914 };
1915
1916 /*
1917  * This structure will be used for multiple mount protection. It will be
1918  * written into the block number saved in the s_mmp_block field in the
1919  * superblock. Programs that check MMP should assume that if
1920  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1921  * to use the filesystem, regardless of how old the timestamp is.
1922  */
1923 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
1924 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1925 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
1926 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
1927
1928 struct mmp_struct {
1929         __le32  mmp_magic;              /* Magic number for MMP */
1930         __le32  mmp_seq;                /* Sequence no. updated periodically */
1931
1932         /*
1933          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1934          * purposes and do not affect the correctness of the algorithm
1935          */
1936         __le64  mmp_time;               /* Time last updated */
1937         char    mmp_nodename[64];       /* Node which last updated MMP block */
1938         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
1939
1940         /*
1941          * mmp_check_interval is used to verify if the MMP block has been
1942          * updated on the block device. The value is updated based on the
1943          * maximum time to write the MMP block during an update cycle.
1944          */
1945         __le16  mmp_check_interval;
1946
1947         __le16  mmp_pad1;
1948         __le32  mmp_pad2[226];
1949         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
1950 };
1951
1952 /* arguments passed to the mmp thread */
1953 struct mmpd_data {
1954         struct buffer_head *bh; /* bh from initial read_mmp_block() */
1955         struct super_block *sb;  /* super block of the fs */
1956 };
1957
1958 /*
1959  * Check interval multiplier
1960  * The MMP block is written every update interval and initially checked every
1961  * update interval x the multiplier (the value is then adapted based on the
1962  * write latency). The reason is that writes can be delayed under load and we
1963  * don't want readers to incorrectly assume that the filesystem is no longer
1964  * in use.
1965  */
1966 #define EXT4_MMP_CHECK_MULT             2UL
1967
1968 /*
1969  * Minimum interval for MMP checking in seconds.
1970  */
1971 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
1972
1973 /*
1974  * Maximum interval for MMP checking in seconds.
1975  */
1976 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
1977
1978 /*
1979  * Function prototypes
1980  */
1981
1982 /*
1983  * Ok, these declarations are also in <linux/kernel.h> but none of the
1984  * ext4 source programs needs to include it so they are duplicated here.
1985  */
1986 # define NORET_TYPE     /**/
1987 # define ATTRIB_NORET   __attribute__((noreturn))
1988 # define NORET_AND      noreturn,
1989
1990 /* bitmap.c */
1991 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1992 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1993                                 struct ext4_group_desc *gdp,
1994                                 struct buffer_head *bh, int sz);
1995 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1996                                   struct ext4_group_desc *gdp,
1997                                   struct buffer_head *bh, int sz);
1998 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1999                                 struct ext4_group_desc *gdp,
2000                                 struct buffer_head *bh);
2001 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2002                                   struct ext4_group_desc *gdp,
2003                                   struct buffer_head *bh);
2004
2005 /* balloc.c */
2006 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2007                                          ext4_fsblk_t blocknr,
2008                                          ext4_group_t *blockgrpp,
2009                                          ext4_grpblk_t *offsetp);
2010 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2011                                           ext4_fsblk_t block);
2012
2013 extern unsigned int ext4_block_group(struct super_block *sb,
2014                         ext4_fsblk_t blocknr);
2015 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2016                         ext4_fsblk_t blocknr);
2017 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2018 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2019                         ext4_group_t group);
2020 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2021                                          ext4_fsblk_t goal,
2022                                          unsigned int flags,
2023                                          unsigned long *count,
2024                                          int *errp);
2025 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2026                                     s64 nclusters, unsigned int flags);
2027 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2028 extern void ext4_check_blocks_bitmap(struct super_block *);
2029 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2030                                                     ext4_group_t block_group,
2031                                                     struct buffer_head ** bh);
2032 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2033
2034 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2035                                                 ext4_group_t block_group);
2036 extern int ext4_wait_block_bitmap(struct super_block *sb,
2037                                   ext4_group_t block_group,
2038                                   struct buffer_head *bh);
2039 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2040                                                   ext4_group_t block_group);
2041 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2042                                               ext4_group_t block_group,
2043                                               struct ext4_group_desc *gdp);
2044 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2045
2046 /* crypto_policy.c */
2047 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2048                                                  struct inode *child);
2049 int ext4_inherit_context(struct inode *parent, struct inode *child);
2050 void ext4_to_hex(char *dst, char *src, size_t src_size);
2051 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2052                         struct inode *inode);
2053 int ext4_get_policy(struct inode *inode,
2054                     struct ext4_encryption_policy *policy);
2055
2056 /* crypto.c */
2057 extern struct kmem_cache *ext4_crypt_info_cachep;
2058 bool ext4_valid_contents_enc_mode(uint32_t mode);
2059 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2060 extern struct workqueue_struct *ext4_read_workqueue;
2061 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode);
2062 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2063 void ext4_restore_control_page(struct page *data_page);
2064 struct page *ext4_encrypt(struct inode *inode,
2065                           struct page *plaintext_page);
2066 int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page);
2067 int ext4_decrypt_one(struct inode *inode, struct page *page);
2068 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex);
2069
2070 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2071 int ext4_init_crypto(void);
2072 void ext4_exit_crypto(void);
2073 static inline int ext4_sb_has_crypto(struct super_block *sb)
2074 {
2075         return EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
2076 }
2077 #else
2078 static inline int ext4_init_crypto(void) { return 0; }
2079 static inline void ext4_exit_crypto(void) { }
2080 static inline int ext4_sb_has_crypto(struct super_block *sb)
2081 {
2082         return 0;
2083 }
2084 #endif
2085
2086 /* crypto_fname.c */
2087 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2088 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2089 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2090 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2091                                    u32 ilen, struct ext4_str *crypto_str);
2092 int _ext4_fname_disk_to_usr(struct inode *inode,
2093                             struct dx_hash_info *hinfo,
2094                             const struct ext4_str *iname,
2095                             struct ext4_str *oname);
2096 int ext4_fname_disk_to_usr(struct inode *inode,
2097                            struct dx_hash_info *hinfo,
2098                            const struct ext4_dir_entry_2 *de,
2099                            struct ext4_str *oname);
2100 int ext4_fname_usr_to_disk(struct inode *inode,
2101                            const struct qstr *iname,
2102                            struct ext4_str *oname);
2103 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2104 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2105 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2106                               int lookup, struct ext4_filename *fname);
2107 void ext4_fname_free_filename(struct ext4_filename *fname);
2108 #else
2109 static inline
2110 int ext4_setup_fname_crypto(struct inode *inode)
2111 {
2112         return 0;
2113 }
2114 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2115 static inline int ext4_fname_setup_filename(struct inode *dir,
2116                                      const struct qstr *iname,
2117                                      int lookup, struct ext4_filename *fname)
2118 {
2119         fname->usr_fname = iname;
2120         fname->disk_name.name = (unsigned char *) iname->name;
2121         fname->disk_name.len = iname->len;
2122         return 0;
2123 }
2124 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2125 #endif
2126
2127
2128 /* crypto_key.c */
2129 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2130 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2131 int _ext4_get_encryption_info(struct inode *inode);
2132
2133 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2134 int ext4_has_encryption_key(struct inode *inode);
2135
2136 static inline int ext4_get_encryption_info(struct inode *inode)
2137 {
2138         struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2139
2140         if (!ci ||
2141             (ci->ci_keyring_key &&
2142              (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2143                                            (1 << KEY_FLAG_REVOKED) |
2144                                            (1 << KEY_FLAG_DEAD)))))
2145                 return _ext4_get_encryption_info(inode);
2146         return 0;
2147 }
2148
2149 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2150 {
2151         return EXT4_I(inode)->i_crypt_info;
2152 }
2153
2154 #else
2155 static inline int ext4_has_encryption_key(struct inode *inode)
2156 {
2157         return 0;
2158 }
2159 static inline int ext4_get_encryption_info(struct inode *inode)
2160 {
2161         return 0;
2162 }
2163 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2164 {
2165         return NULL;
2166 }
2167 #endif
2168
2169
2170 /* dir.c */
2171 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2172                                   struct file *,
2173                                   struct ext4_dir_entry_2 *,
2174                                   struct buffer_head *, char *, int,
2175                                   unsigned int);
2176 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
2177         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2178                                         (de), (bh), (buf), (size), (offset)))
2179 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2180                                 __u32 minor_hash,
2181                                 struct ext4_dir_entry_2 *dirent,
2182                                 struct ext4_str *ent_name);
2183 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2184 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2185                              struct buffer_head *bh,
2186                              void *buf, int buf_size,
2187                              struct ext4_filename *fname,
2188                              struct ext4_dir_entry_2 **dest_de);
2189 int ext4_insert_dentry(struct inode *dir,
2190                        struct inode *inode,
2191                        struct ext4_dir_entry_2 *de,
2192                        int buf_size,
2193                        struct ext4_filename *fname);
2194 static inline void ext4_update_dx_flag(struct inode *inode)
2195 {
2196         if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2197                                      EXT4_FEATURE_COMPAT_DIR_INDEX))
2198                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2199 }
2200 static unsigned char ext4_filetype_table[] = {
2201         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2202 };
2203
2204 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2205 {
2206         if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2207             (filetype >= EXT4_FT_MAX))
2208                 return DT_UNKNOWN;
2209
2210         return ext4_filetype_table[filetype];
2211 }
2212 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2213                              void *buf, int buf_size);
2214
2215 /* fsync.c */
2216 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2217
2218 /* hash.c */
2219 extern int ext4fs_dirhash(const char *name, int len, struct
2220                           dx_hash_info *hinfo);
2221
2222 /* ialloc.c */
2223 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2224                                       const struct qstr *qstr, __u32 goal,
2225                                       uid_t *owner, int handle_type,
2226                                       unsigned int line_no, int nblocks);
2227
2228 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2229         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2230                          0, 0, 0)
2231 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2232                                     type, nblocks)                  \
2233         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2234                          (type), __LINE__, (nblocks))
2235
2236
2237 extern void ext4_free_inode(handle_t *, struct inode *);
2238 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2239 extern unsigned long ext4_count_free_inodes(struct super_block *);
2240 extern unsigned long ext4_count_dirs(struct super_block *);
2241 extern void ext4_check_inodes_bitmap(struct super_block *);
2242 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2243 extern int ext4_init_inode_table(struct super_block *sb,
2244                                  ext4_group_t group, int barrier);
2245 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2246
2247 /* mballoc.c */
2248 extern long ext4_mb_stats;
2249 extern long ext4_mb_max_to_scan;
2250 extern int ext4_mb_init(struct super_block *);
2251 extern int ext4_mb_release(struct super_block *);
2252 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2253                                 struct ext4_allocation_request *, int *);
2254 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2255 extern void ext4_discard_preallocations(struct inode *);
2256 extern int __init ext4_init_mballoc(void);
2257 extern void ext4_exit_mballoc(void);
2258 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2259                              struct buffer_head *bh, ext4_fsblk_t block,
2260                              unsigned long count, int flags);
2261 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2262                                    ext4_group_t ngroups);
2263 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2264                 ext4_group_t i, struct ext4_group_desc *desc);
2265 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2266                                 ext4_fsblk_t block, unsigned long count);
2267 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2268
2269 /* inode.c */
2270 int ext4_inode_is_fast_symlink(struct inode *inode);
2271 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2272 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2273 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2274                          struct buffer_head *bh_result, int create);
2275 int ext4_get_block_dax(struct inode *inode, sector_t iblock,
2276                          struct buffer_head *bh_result, int create);
2277 int ext4_get_block(struct inode *inode, sector_t iblock,
2278                                 struct buffer_head *bh_result, int create);
2279 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2280                            struct buffer_head *bh, int create);
2281 int ext4_walk_page_buffers(handle_t *handle,
2282                            struct buffer_head *head,
2283                            unsigned from,
2284                            unsigned to,
2285                            int *partial,
2286                            int (*fn)(handle_t *handle,
2287                                      struct buffer_head *bh));
2288 int do_journal_get_write_access(handle_t *handle,
2289                                 struct buffer_head *bh);
2290 #define FALL_BACK_TO_NONDELALLOC 1
2291 #define CONVERT_INLINE_DATA      2
2292
2293 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2294 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2295 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2296 extern int  ext4_setattr(struct dentry *, struct iattr *);
2297 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2298                                 struct kstat *stat);
2299 extern void ext4_evict_inode(struct inode *);
2300 extern void ext4_clear_inode(struct inode *);
2301 extern int  ext4_sync_inode(handle_t *, struct inode *);
2302 extern void ext4_dirty_inode(struct inode *, int);
2303 extern int ext4_change_inode_journal_flag(struct inode *, int);
2304 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2305 extern int ext4_inode_attach_jinode(struct inode *inode);
2306 extern int ext4_can_truncate(struct inode *inode);
2307 extern void ext4_truncate(struct inode *);
2308 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2309 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2310 extern void ext4_set_inode_flags(struct inode *);
2311 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2312 extern int ext4_alloc_da_blocks(struct inode *inode);
2313 extern void ext4_set_aops(struct inode *inode);
2314 extern int ext4_writepage_trans_blocks(struct inode *);
2315 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2316 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2317                              loff_t lstart, loff_t lend);
2318 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2319 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2320 extern void ext4_da_update_reserve_space(struct inode *inode,
2321                                         int used, int quota_claim);
2322
2323 /* indirect.c */
2324 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2325                                 struct ext4_map_blocks *map, int flags);
2326 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2327                                   loff_t offset);
2328 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2329 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2330 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2331 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2332                                  ext4_lblk_t start, ext4_lblk_t end);
2333
2334 /* ioctl.c */
2335 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2336 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2337
2338 /* migrate.c */
2339 extern int ext4_ext_migrate(struct inode *);
2340 extern int ext4_ind_migrate(struct inode *inode);
2341
2342 /* namei.c */
2343 extern int ext4_dirent_csum_verify(struct inode *inode,
2344                                    struct ext4_dir_entry *dirent);
2345 extern int ext4_orphan_add(handle_t *, struct inode *);
2346 extern int ext4_orphan_del(handle_t *, struct inode *);
2347 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2348                                 __u32 start_minor_hash, __u32 *next_hash);
2349 extern int ext4_search_dir(struct buffer_head *bh,
2350                            char *search_buf,
2351                            int buf_size,
2352                            struct inode *dir,
2353                            struct ext4_filename *fname,
2354                            const struct qstr *d_name,
2355                            unsigned int offset,
2356                            struct ext4_dir_entry_2 **res_dir);
2357 extern int ext4_generic_delete_entry(handle_t *handle,
2358                                      struct inode *dir,
2359                                      struct ext4_dir_entry_2 *de_del,
2360                                      struct buffer_head *bh,
2361                                      void *entry_buf,
2362                                      int buf_size,
2363                                      int csum_size);
2364 extern int ext4_empty_dir(struct inode *inode);
2365
2366 /* resize.c */
2367 extern int ext4_group_add(struct super_block *sb,
2368                                 struct ext4_new_group_data *input);
2369 extern int ext4_group_extend(struct super_block *sb,
2370                                 struct ext4_super_block *es,
2371                                 ext4_fsblk_t n_blocks_count);
2372 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2373
2374 /* super.c */
2375 extern int ext4_calculate_overhead(struct super_block *sb);
2376 extern void ext4_superblock_csum_set(struct super_block *sb);
2377 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2378 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2379 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2380                                     ext4_group_t ngroup);
2381 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2382                                      char nbuf[16]);
2383
2384 extern __printf(4, 5)
2385 void __ext4_error(struct super_block *, const char *, unsigned int,
2386                   const char *, ...);
2387 extern __printf(5, 6)
2388 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2389                       const char *, ...);
2390 extern __printf(5, 6)
2391 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2392                      const char *, ...);
2393 extern void __ext4_std_error(struct super_block *, const char *,
2394                              unsigned int, int);
2395 extern __printf(4, 5)
2396 void __ext4_abort(struct super_block *, const char *, unsigned int,
2397                   const char *, ...);
2398 extern __printf(4, 5)
2399 void __ext4_warning(struct super_block *, const char *, unsigned int,
2400                     const char *, ...);
2401 extern __printf(4, 5)
2402 void __ext4_warning_inode(const struct inode *inode, const char *function,
2403                           unsigned int line, const char *fmt, ...);
2404 extern __printf(3, 4)
2405 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2406 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2407                            const char *, unsigned int, const char *);
2408 extern __printf(7, 8)
2409 void __ext4_grp_locked_error(const char *, unsigned int,
2410                              struct super_block *, ext4_group_t,
2411                              unsigned long, ext4_fsblk_t,
2412                              const char *, ...);
2413
2414 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2415         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2416
2417 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
2418         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2419
2420 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
2421         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2422
2423 #ifdef CONFIG_PRINTK
2424
2425 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2426         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2427 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2428         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2429 #define ext4_error(sb, fmt, ...)                                        \
2430         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2431 #define ext4_abort(sb, fmt, ...)                                        \
2432         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2433 #define ext4_warning(sb, fmt, ...)                                      \
2434         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2435 #define ext4_warning_inode(inode, fmt, ...)                             \
2436         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2437 #define ext4_msg(sb, level, fmt, ...)                           \
2438         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2439 #define dump_mmp_msg(sb, mmp, msg)                                      \
2440         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2441 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2442         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2443                                 fmt, ##__VA_ARGS__)
2444
2445 #else
2446
2447 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
2448 do {                                                                    \
2449         no_printk(fmt, ##__VA_ARGS__);                                  \
2450         __ext4_error_inode(inode, "", 0, block, " ");                   \
2451 } while (0)
2452 #define ext4_error_file(file, func, line, block, fmt, ...)              \
2453 do {                                                                    \
2454         no_printk(fmt, ##__VA_ARGS__);                                  \
2455         __ext4_error_file(file, "", 0, block, " ");                     \
2456 } while (0)
2457 #define ext4_error(sb, fmt, ...)                                        \
2458 do {                                                                    \
2459         no_printk(fmt, ##__VA_ARGS__);                                  \
2460         __ext4_error(sb, "", 0, " ");                                   \
2461 } while (0)
2462 #define ext4_abort(sb, fmt, ...)                                        \
2463 do {                                                                    \
2464         no_printk(fmt, ##__VA_ARGS__);                                  \
2465         __ext4_abort(sb, "", 0, " ");                                   \
2466 } while (0)
2467 #define ext4_warning(sb, fmt, ...)                                      \
2468 do {                                                                    \
2469         no_printk(fmt, ##__VA_ARGS__);                                  \
2470         __ext4_warning(sb, "", 0, " ");                                 \
2471 } while (0)
2472 #define ext4_warning_inode(inode, fmt, ...)                             \
2473 do {                                                                    \
2474         no_printk(fmt, ##__VA_ARGS__);                                  \
2475         __ext4_warning_inode(inode, "", 0, " ");                        \
2476 } while (0)
2477 #define ext4_msg(sb, level, fmt, ...)                                   \
2478 do {                                                                    \
2479         no_printk(fmt, ##__VA_ARGS__);                                  \
2480         __ext4_msg(sb, "", " ");                                        \
2481 } while (0)
2482 #define dump_mmp_msg(sb, mmp, msg)                                      \
2483         __dump_mmp_msg(sb, mmp, "", 0, "")
2484 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
2485 do {                                                                    \
2486         no_printk(fmt, ##__VA_ARGS__);                          \
2487         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
2488 } while (0)
2489
2490 #endif
2491
2492 extern void ext4_update_dynamic_rev(struct super_block *sb);
2493 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2494                                         __u32 compat);
2495 extern int ext4_update_rocompat_feature(handle_t *handle,
2496                                         struct super_block *sb, __u32 rocompat);
2497 extern int ext4_update_incompat_feature(handle_t *handle,
2498                                         struct super_block *sb, __u32 incompat);
2499 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2500                                       struct ext4_group_desc *bg);
2501 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2502                                       struct ext4_group_desc *bg);
2503 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2504                                      struct ext4_group_desc *bg);
2505 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2506                                       struct ext4_group_desc *bg);
2507 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2508                                  struct ext4_group_desc *bg);
2509 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2510                                 struct ext4_group_desc *bg);
2511 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2512                                    struct ext4_group_desc *bg);
2513 extern void ext4_block_bitmap_set(struct super_block *sb,
2514                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2515 extern void ext4_inode_bitmap_set(struct super_block *sb,
2516                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2517 extern void ext4_inode_table_set(struct super_block *sb,
2518                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2519 extern void ext4_free_group_clusters_set(struct super_block *sb,
2520                                          struct ext4_group_desc *bg,
2521                                          __u32 count);
2522 extern void ext4_free_inodes_set(struct super_block *sb,
2523                                 struct ext4_group_desc *bg, __u32 count);
2524 extern void ext4_used_dirs_set(struct super_block *sb,
2525                                 struct ext4_group_desc *bg, __u32 count);
2526 extern void ext4_itable_unused_set(struct super_block *sb,
2527                                    struct ext4_group_desc *bg, __u32 count);
2528 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2529                                        struct ext4_group_desc *gdp);
2530 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2531                                      struct ext4_group_desc *gdp);
2532 extern int ext4_register_li_request(struct super_block *sb,
2533                                     ext4_group_t first_not_zeroed);
2534
2535 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2536 {
2537         return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2538                                           EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
2539                (EXT4_SB(sb)->s_chksum_driver != NULL);
2540 }
2541
2542 static inline int ext4_has_metadata_csum(struct super_block *sb)
2543 {
2544         WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb,
2545                         EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
2546                      !EXT4_SB(sb)->s_chksum_driver);
2547
2548         return (EXT4_SB(sb)->s_chksum_driver != NULL);
2549 }
2550 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2551 {
2552         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2553                 le32_to_cpu(es->s_blocks_count_lo);
2554 }
2555
2556 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2557 {
2558         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2559                 le32_to_cpu(es->s_r_blocks_count_lo);
2560 }
2561
2562 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2563 {
2564         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2565                 le32_to_cpu(es->s_free_blocks_count_lo);
2566 }
2567
2568 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2569                                          ext4_fsblk_t blk)
2570 {
2571         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2572         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2573 }
2574
2575 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2576                                               ext4_fsblk_t blk)
2577 {
2578         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2579         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2580 }
2581
2582 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2583                                            ext4_fsblk_t blk)
2584 {
2585         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2586         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2587 }
2588
2589 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2590 {
2591         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2592                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2593                         le32_to_cpu(raw_inode->i_size_lo);
2594         else
2595                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2596 }
2597
2598 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2599 {
2600         raw_inode->i_size_lo = cpu_to_le32(i_size);
2601         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2602 }
2603
2604 static inline
2605 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2606                                             ext4_group_t group)
2607 {
2608          struct ext4_group_info ***grp_info;
2609          long indexv, indexh;
2610          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2611          grp_info = EXT4_SB(sb)->s_group_info;
2612          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2613          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2614          return grp_info[indexv][indexh];
2615 }
2616
2617 /*
2618  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2619  * the locking protocol documented in the comments of ext4_group_add()
2620  * in resize.c
2621  */
2622 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2623 {
2624         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2625
2626         smp_rmb();
2627         return ngroups;
2628 }
2629
2630 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2631                                              ext4_group_t block_group)
2632 {
2633         return block_group >> sbi->s_log_groups_per_flex;
2634 }
2635
2636 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2637 {
2638         return 1 << sbi->s_log_groups_per_flex;
2639 }
2640
2641 #define ext4_std_error(sb, errno)                               \
2642 do {                                                            \
2643         if ((errno))                                            \
2644                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2645 } while (0)
2646
2647 #ifdef CONFIG_SMP
2648 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2649  * counters. So we need to make sure we have free clusters more
2650  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2651  */
2652 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2653 #else
2654 #define EXT4_FREECLUSTERS_WATERMARK 0
2655 #endif
2656
2657 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2658 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2659 {
2660         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2661                      !mutex_is_locked(&inode->i_mutex));
2662         down_write(&EXT4_I(inode)->i_data_sem);
2663         if (newsize > EXT4_I(inode)->i_disksize)
2664                 EXT4_I(inode)->i_disksize = newsize;
2665         up_write(&EXT4_I(inode)->i_data_sem);
2666 }
2667
2668 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2669 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2670 {
2671         int changed = 0;
2672
2673         if (newsize > inode->i_size) {
2674                 i_size_write(inode, newsize);
2675                 changed = 1;
2676         }
2677         if (newsize > EXT4_I(inode)->i_disksize) {
2678                 ext4_update_i_disksize(inode, newsize);
2679                 changed |= 2;
2680         }
2681         return changed;
2682 }
2683
2684 struct ext4_group_info {
2685         unsigned long   bb_state;
2686         struct rb_root  bb_free_root;
2687         ext4_grpblk_t   bb_first_free;  /* first free block */
2688         ext4_grpblk_t   bb_free;        /* total free blocks */
2689         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2690         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2691         struct          list_head bb_prealloc_list;
2692 #ifdef DOUBLE_CHECK
2693         void            *bb_bitmap;
2694 #endif
2695         struct rw_semaphore alloc_sem;
2696         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2697                                          * regions, index is order.
2698                                          * bb_counters[3] = 5 means
2699                                          * 5 free 8-block regions. */
2700 };
2701
2702 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2703 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2704 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
2705 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
2706
2707 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2708         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2709 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
2710         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2711 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
2712         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2713
2714 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2715         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2716 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2717         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2718 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2719         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2720
2721 #define EXT4_MAX_CONTENTION             8
2722 #define EXT4_CONTENTION_THRESHOLD       2
2723
2724 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2725                                               ext4_group_t group)
2726 {
2727         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2728 }
2729
2730 /*
2731  * Returns true if the filesystem is busy enough that attempts to
2732  * access the block group locks has run into contention.
2733  */
2734 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2735 {
2736         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2737 }
2738
2739 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2740 {
2741         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2742         if (spin_trylock(lock))
2743                 /*
2744                  * We're able to grab the lock right away, so drop the
2745                  * lock contention counter.
2746                  */
2747                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2748         else {
2749                 /*
2750                  * The lock is busy, so bump the contention counter,
2751                  * and then wait on the spin lock.
2752                  */
2753                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2754                                   EXT4_MAX_CONTENTION);
2755                 spin_lock(lock);
2756         }
2757 }
2758
2759 static inline void ext4_unlock_group(struct super_block *sb,
2760                                         ext4_group_t group)
2761 {
2762         spin_unlock(ext4_group_lock_ptr(sb, group));
2763 }
2764
2765 /*
2766  * Block validity checking
2767  */
2768 #define ext4_check_indirect_blockref(inode, bh)                         \
2769         ext4_check_blockref(__func__, __LINE__, inode,                  \
2770                             (__le32 *)(bh)->b_data,                     \
2771                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2772
2773 #define ext4_ind_check_inode(inode)                                     \
2774         ext4_check_blockref(__func__, __LINE__, inode,                  \
2775                             EXT4_I(inode)->i_data,                      \
2776                             EXT4_NDIR_BLOCKS)
2777
2778 /*
2779  * Inodes and files operations
2780  */
2781
2782 /* dir.c */
2783 extern const struct file_operations ext4_dir_operations;
2784
2785 /* file.c */
2786 extern const struct inode_operations ext4_file_inode_operations;
2787 extern const struct file_operations ext4_file_operations;
2788 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2789
2790 /* inline.c */
2791 extern int ext4_get_max_inline_size(struct inode *inode);
2792 extern int ext4_find_inline_data_nolock(struct inode *inode);
2793 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2794                                  unsigned int len);
2795 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2796
2797 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2798 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2799                                          struct inode *inode,
2800                                          loff_t pos, unsigned len,
2801                                          unsigned flags,
2802                                          struct page **pagep);
2803 extern int ext4_write_inline_data_end(struct inode *inode,
2804                                       loff_t pos, unsigned len,
2805                                       unsigned copied,
2806                                       struct page *page);
2807 extern struct buffer_head *
2808 ext4_journalled_write_inline_data(struct inode *inode,
2809                                   unsigned len,
2810                                   struct page *page);
2811 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2812                                            struct inode *inode,
2813                                            loff_t pos, unsigned len,
2814                                            unsigned flags,
2815                                            struct page **pagep,
2816                                            void **fsdata);
2817 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2818                                          unsigned len, unsigned copied,
2819                                          struct page *page);
2820 extern int ext4_try_add_inline_entry(handle_t *handle,
2821                                      struct ext4_filename *fname,
2822                                      struct dentry *dentry,
2823                                      struct inode *inode);
2824 extern int ext4_try_create_inline_dir(handle_t *handle,
2825                                       struct inode *parent,
2826                                       struct inode *inode);
2827 extern int ext4_read_inline_dir(struct file *filp,
2828                                 struct dir_context *ctx,
2829                                 int *has_inline_data);
2830 extern int htree_inlinedir_to_tree(struct file *dir_file,
2831                                    struct inode *dir, ext4_lblk_t block,
2832                                    struct dx_hash_info *hinfo,
2833                                    __u32 start_hash, __u32 start_minor_hash,
2834                                    int *has_inline_data);
2835 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2836                                         struct ext4_filename *fname,
2837                                         const struct qstr *d_name,
2838                                         struct ext4_dir_entry_2 **res_dir,
2839                                         int *has_inline_data);
2840 extern int ext4_delete_inline_entry(handle_t *handle,
2841                                     struct inode *dir,
2842                                     struct ext4_dir_entry_2 *de_del,
2843                                     struct buffer_head *bh,
2844                                     int *has_inline_data);
2845 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2846 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2847                                         struct ext4_dir_entry_2 **parent_de,
2848                                         int *retval);
2849 extern int ext4_inline_data_fiemap(struct inode *inode,
2850                                    struct fiemap_extent_info *fieinfo,
2851                                    int *has_inline, __u64 start, __u64 len);
2852 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2853                                          struct inode *inode,
2854                                          int needed);
2855 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2856
2857 extern int ext4_convert_inline_data(struct inode *inode);
2858
2859 static inline int ext4_has_inline_data(struct inode *inode)
2860 {
2861         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
2862                EXT4_I(inode)->i_inline_off;
2863 }
2864
2865 /* namei.c */
2866 extern const struct inode_operations ext4_dir_inode_operations;
2867 extern const struct inode_operations ext4_special_inode_operations;
2868 extern struct dentry *ext4_get_parent(struct dentry *child);
2869 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2870                                  struct ext4_dir_entry_2 *de,
2871                                  int blocksize, int csum_size,
2872                                  unsigned int parent_ino, int dotdot_real_len);
2873 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2874                                    unsigned int blocksize);
2875 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2876                                          struct inode *inode,
2877                                          struct buffer_head *bh);
2878 #define S_SHIFT 12
2879 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2880         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
2881         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
2882         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
2883         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
2884         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
2885         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
2886         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
2887 };
2888
2889 static inline void ext4_set_de_type(struct super_block *sb,
2890                                 struct ext4_dir_entry_2 *de,
2891                                 umode_t mode) {
2892         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2893                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2894 }
2895
2896 /* readpages.c */
2897 extern int ext4_mpage_readpages(struct address_space *mapping,
2898                                 struct list_head *pages, struct page *page,
2899                                 unsigned nr_pages);
2900
2901 /* symlink.c */
2902 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
2903 extern const struct inode_operations ext4_symlink_inode_operations;
2904 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2905
2906 /* block_validity */
2907 extern void ext4_release_system_zone(struct super_block *sb);
2908 extern int ext4_setup_system_zone(struct super_block *sb);
2909 extern int __init ext4_init_system_zone(void);
2910 extern void ext4_exit_system_zone(void);
2911 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2912                                  ext4_fsblk_t start_blk,
2913                                  unsigned int count);
2914 extern int ext4_check_blockref(const char *, unsigned int,
2915                                struct inode *, __le32 *, unsigned int);
2916
2917 /* extents.c */
2918 struct ext4_ext_path;
2919 struct ext4_extent;
2920
2921 /*
2922  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2923  * __le32.
2924  */
2925 #define EXT_MAX_BLOCKS  0xffffffff
2926
2927 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2928 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2929 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2930 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2931                                struct ext4_map_blocks *map, int flags);
2932 extern void ext4_ext_truncate(handle_t *, struct inode *);
2933 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2934                                  ext4_lblk_t end);
2935 extern void ext4_ext_init(struct super_block *);
2936 extern void ext4_ext_release(struct super_block *);
2937 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2938                           loff_t len);
2939 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2940                                           loff_t offset, ssize_t len);
2941 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2942                            struct ext4_map_blocks *map, int flags);
2943 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2944                                          ext4_lblk_t lblocks);
2945 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2946                                                    int num,
2947                                                    struct ext4_ext_path *path);
2948 extern int ext4_can_extents_be_merged(struct inode *inode,
2949                                       struct ext4_extent *ex1,
2950                                       struct ext4_extent *ex2);
2951 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2952                                   struct ext4_ext_path **,
2953                                   struct ext4_extent *, int);
2954 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
2955                                               struct ext4_ext_path **,
2956                                               int flags);
2957 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2958 extern int ext4_ext_check_inode(struct inode *inode);
2959 extern int ext4_find_delalloc_range(struct inode *inode,
2960                                     ext4_lblk_t lblk_start,
2961                                     ext4_lblk_t lblk_end);
2962 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2963 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
2964 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2965                         __u64 start, __u64 len);
2966 extern int ext4_ext_precache(struct inode *inode);
2967 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
2968 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
2969 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
2970                                 struct inode *inode2, ext4_lblk_t lblk1,
2971                              ext4_lblk_t lblk2,  ext4_lblk_t count,
2972                              int mark_unwritten,int *err);
2973
2974 /* move_extent.c */
2975 extern void ext4_double_down_write_data_sem(struct inode *first,
2976                                             struct inode *second);
2977 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2978                                           struct inode *donor_inode);
2979 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2980                              __u64 start_orig, __u64 start_donor,
2981                              __u64 len, __u64 *moved_len);
2982
2983 /* page-io.c */
2984 extern int __init ext4_init_pageio(void);
2985 extern void ext4_exit_pageio(void);
2986 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2987 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2988 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2989 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2990 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2991                                 struct writeback_control *wbc);
2992 extern void ext4_end_io_rsv_work(struct work_struct *work);
2993 extern void ext4_io_submit(struct ext4_io_submit *io);
2994 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2995                                struct page *page,
2996                                int len,
2997                                struct writeback_control *wbc,
2998                                bool keep_towrite);
2999
3000 /* mmp.c */
3001 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3002
3003 /*
3004  * Add new method to test whether block and inode bitmaps are properly
3005  * initialized. With uninit_bg reading the block from disk is not enough
3006  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3007  */
3008 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3009
3010 static inline int bitmap_uptodate(struct buffer_head *bh)
3011 {
3012         return (buffer_uptodate(bh) &&
3013                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3014 }
3015 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3016 {
3017         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3018 }
3019
3020 /*
3021  * Disable DIO read nolock optimization, so new dioreaders will be forced
3022  * to grab i_mutex
3023  */
3024 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3025 {
3026         ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3027         smp_mb();
3028 }
3029 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3030 {
3031         smp_mb();
3032         ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3033 }
3034
3035 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3036
3037 /* For ioend & aio unwritten conversion wait queues */
3038 #define EXT4_WQ_HASH_SZ         37
3039 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3040                                             EXT4_WQ_HASH_SZ])
3041 #define ext4_aio_mutex(v)  (&ext4__aio_mutex[((unsigned long)(v)) %\
3042                                              EXT4_WQ_HASH_SZ])
3043 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3044 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
3045
3046 #define EXT4_RESIZING   0
3047 extern int ext4_resize_begin(struct super_block *sb);
3048 extern void ext4_resize_end(struct super_block *sb);
3049
3050 #endif  /* __KERNEL__ */
3051
3052 #endif  /* _EXT4_H */