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 #ifdef __KERNEL__
  33 #include <linux/compat.h>
  34 #endif
  35
  36 /*
  37  * The fourth extended filesystem constants/structures
  38  */
  39
  40 /*
  41  * Define EXT4FS_DEBUG to produce debug messages
  42  */
  43 #undef EXT4FS_DEBUG
  44
  45 /*
  46  * Debug code
  47  */
  48 #ifdef EXT4FS_DEBUG
  49 #define ext4_debug(f, a...)                                             \
  50         do {                                                            \
  51                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  52                         __FILE__, __LINE__, __func__);                  \
  53                 printk(KERN_DEBUG f, ## a);                             \
  54         } while (0)
  55 #else
  56 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  57 #endif
  58
  59 #define EXT4_ERROR_INODE(inode, fmt, a...) \
  60         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
  61
  62 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
  63         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
  64
  65 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
  66         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
  67
  68 /* data type for block offset of block group */
  69 typedef int ext4_grpblk_t;
  70
  71 /* data type for filesystem-wide blocks number */
  72 typedef unsigned long long ext4_fsblk_t;
  73
  74 /* data type for file logical block number */
  75 typedef __u32 ext4_lblk_t;
  76
  77 /* data type for block group number */
  78 typedef unsigned int ext4_group_t;
  79
  80 /*
  81  * Flags used in mballoc's allocation_context flags field.
  82  *
  83  * Also used to show what's going on for debugging purposes when the
  84  * flag field is exported via the traceport interface
  85  */
  86
  87 /* prefer goal again. length */
  88 #define EXT4_MB_HINT_MERGE              0x0001
  89 /* blocks already reserved */
  90 #define EXT4_MB_HINT_RESERVED           0x0002
  91 /* metadata is being allocated */
  92 #define EXT4_MB_HINT_METADATA           0x0004
  93 /* first blocks in the file */
  94 #define EXT4_MB_HINT_FIRST              0x0008
  95 /* search for the best chunk */
  96 #define EXT4_MB_HINT_BEST               0x0010
  97 /* data is being allocated */
  98 #define EXT4_MB_HINT_DATA               0x0020
  99 /* don't preallocate (for tails) */
 100 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 101 /* allocate for locality group */
 102 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 103 /* allocate goal blocks or none */
 104 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 105 /* goal is meaningful */
 106 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 107 /* blocks already pre-reserved by delayed allocation */
 108 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 109 /* We are doing stream allocation */
 110 #define EXT4_MB_STREAM_ALLOC            0x0800
 111 /* Use reserved root blocks if needed */
 112 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 113
 114 struct ext4_allocation_request {
 115         /* target inode for block we're allocating */
 116         struct inode *inode;
 117         /* how many blocks we want to allocate */
 118         unsigned int len;
 119         /* logical block in target inode */
 120         ext4_lblk_t logical;
 121         /* the closest logical allocated block to the left */
 122         ext4_lblk_t lleft;
 123         /* the closest logical allocated block to the right */
 124         ext4_lblk_t lright;
 125         /* phys. target (a hint) */
 126         ext4_fsblk_t goal;
 127         /* phys. block for the closest logical allocated block to the left */
 128         ext4_fsblk_t pleft;
 129         /* phys. block for the closest logical allocated block to the right */
 130         ext4_fsblk_t pright;
 131         /* flags. see above EXT4_MB_HINT_* */
 132         unsigned int flags;
 133 };
 134
 135 /*
 136  * Logical to physical block mapping, used by ext4_map_blocks()
 137  *
 138  * This structure is used to pass requests into ext4_map_blocks() as
 139  * well as to store the information returned by ext4_map_blocks().  It
 140  * takes less room on the stack than a struct buffer_head.
 141  */
 142 #define EXT4_MAP_NEW            (1 << BH_New)
 143 #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
 144 #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
 145 #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
 146 #define EXT4_MAP_UNINIT         (1 << BH_Uninit)
 147 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
 148  * ext4_map_blocks wants to know whether or not the underlying cluster has
 149  * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
 150  * the requested mapping was from previously mapped (or delayed allocated)
 151  * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
 152  * should never appear on buffer_head's state flags.
 153  */
 154 #define EXT4_MAP_FROM_CLUSTER   (1 << BH_AllocFromCluster)
 155 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 156                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
 157                                  EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
 158
 159 struct ext4_map_blocks {
 160         ext4_fsblk_t m_pblk;
 161         ext4_lblk_t m_lblk;
 162         unsigned int m_len;
 163         unsigned int m_flags;
 164 };
 165
 166 /*
 167  * For delayed allocation tracking
 168  */
 169 struct mpage_da_data {
 170         struct inode *inode;
 171         sector_t b_blocknr;             /* start block number of extent */
 172         size_t b_size;                  /* size of extent */
 173         unsigned long b_state;          /* state of the extent */
 174         unsigned long first_page, next_page;    /* extent of pages */
 175         struct writeback_control *wbc;
 176         int io_done;
 177         int pages_written;
 178         int retval;
 179 };
 180
 181 /*
 182  * Flags for ext4_io_end->flags
 183  */
 184 #define EXT4_IO_END_UNWRITTEN   0x0001
 185 #define EXT4_IO_END_ERROR       0x0002
 186 #define EXT4_IO_END_QUEUED      0x0004
 187 #define EXT4_IO_END_DIRECT      0x0008
 188 #define EXT4_IO_END_IN_FSYNC    0x0010
 189
 190 struct ext4_io_page {
 191         struct page     *p_page;
 192         atomic_t        p_count;
 193 };
 194
 195 #define MAX_IO_PAGES 128
 196
 197 /*
 198  * For converting uninitialized extents on a work queue.
 199  *
 200  * 'page' is only used from the writepage() path; 'pages' is only used for
 201  * buffered writes; they are used to keep page references until conversion
 202  * takes place.  For AIO/DIO, neither field is filled in.
 203  */
 204 typedef struct ext4_io_end {
 205         struct list_head        list;           /* per-file finished IO list */
 206         struct inode            *inode;         /* file being written to */
 207         unsigned int            flag;           /* unwritten or not */
 208         struct page             *page;          /* for writepage() path */
 209         loff_t                  offset;         /* offset in the file */
 210         ssize_t                 size;           /* size of the extent */
 211         struct work_struct      work;           /* data work queue */
 212         struct kiocb            *iocb;          /* iocb struct for AIO */
 213         int                     result;         /* error value for AIO */
 214         int                     num_io_pages;   /* for writepages() */
 215         struct ext4_io_page     *pages[MAX_IO_PAGES]; /* for writepages() */
 216 } ext4_io_end_t;
 217
 218 struct ext4_io_submit {
 219         int                     io_op;
 220         struct bio              *io_bio;
 221         ext4_io_end_t           *io_end;
 222         struct ext4_io_page     *io_page;
 223         sector_t                io_next_block;
 224 };
 225
 226 /*
 227  * Special inodes numbers
 228  */
 229 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 230 #define EXT4_ROOT_INO            2      /* Root inode */
 231 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 232 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 233 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 234 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 235 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 236 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 237
 238 /* First non-reserved inode for old ext4 filesystems */
 239 #define EXT4_GOOD_OLD_FIRST_INO 11
 240
 241 /*
 242  * Maximal count of links to a file
 243  */
 244 #define EXT4_LINK_MAX           65000
 245
 246 /*
 247  * Macro-instructions used to manage several block sizes
 248  */
 249 #define EXT4_MIN_BLOCK_SIZE             1024
 250 #define EXT4_MAX_BLOCK_SIZE             65536
 251 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 252 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 253 #ifdef __KERNEL__
 254 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 255 #else
 256 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 257 #endif
 258 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 259 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 260                                          EXT4_SB(s)->s_cluster_bits)
 261 #ifdef __KERNEL__
 262 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 263 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 264 #else
 265 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 266 #endif
 267 #ifdef __KERNEL__
 268 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 269 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 270 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 271 #else
 272 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 273                                  EXT4_GOOD_OLD_INODE_SIZE : \
 274                                  (s)->s_inode_size)
 275 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 276                                  EXT4_GOOD_OLD_FIRST_INO : \
 277                                  (s)->s_first_ino)
 278 #endif
 279 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 280
 281 /* Translate a block number to a cluster number */
 282 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 283 /* Translate a cluster number to a block number */
 284 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 285 /* Translate # of blks to # of clusters */
 286 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 287                                  (sbi)->s_cluster_bits)
 288
 289 /*
 290  * Structure of a blocks group descriptor
 291  */
 292 struct ext4_group_desc
 293 {
 294         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 295         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 296         __le32  bg_inode_table_lo;      /* Inodes table block */
 297         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 298         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 299         __le16  bg_used_dirs_count_lo;  /* Directories count */
 300         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 301         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 302         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 303         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 304         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 305         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 306         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 307         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 308         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 309         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 310         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 311         __u32   bg_reserved2[3];
 312 };
 313
 314 /*
 315  * Structure of a flex block group info
 316  */
 317
 318 struct flex_groups {
 319         atomic_t free_inodes;
 320         atomic_t free_clusters;
 321         atomic_t used_dirs;
 322 };
 323
 324 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 325 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 326 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 327
 328 /*
 329  * Macro-instructions used to manage group descriptors
 330  */
 331 #define EXT4_MIN_DESC_SIZE              32
 332 #define EXT4_MIN_DESC_SIZE_64BIT        64
 333 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 334 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 335 #ifdef __KERNEL__
 336 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 337 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 338 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 339 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 340 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 341 #else
 342 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 343 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 344 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 345 #endif
 346
 347 /*
 348  * Constants relative to the data blocks
 349  */
 350 #define EXT4_NDIR_BLOCKS                12
 351 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 352 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 353 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 354 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 355
 356 /*
 357  * Inode flags
 358  */
 359 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 360 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 361 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 362 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 363 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 364 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 365 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 366 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 367 /* Reserved for compression usage... */
 368 #define EXT4_DIRTY_FL                   0x00000100
 369 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 370 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 371 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 372 /* End compression flags --- maybe not all used */
 373 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 374 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 375 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 376 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 377 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 378 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 379 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 380 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 381 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 382 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 383 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 384
 385 #define EXT4_FL_USER_VISIBLE            0x004BDFFF /* User visible flags */
 386 #define EXT4_FL_USER_MODIFIABLE         0x004B80FF /* User modifiable flags */
 387
 388 /* Flags that should be inherited by new inodes from their parent. */
 389 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 390                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 391                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 392                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
 393
 394 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 395 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 396
 397 /* Flags that are appropriate for non-directories/regular files. */
 398 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 399
 400 /* Mask out flags that are inappropriate for the given type of inode. */
 401 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 402 {
 403         if (S_ISDIR(mode))
 404                 return flags;
 405         else if (S_ISREG(mode))
 406                 return flags & EXT4_REG_FLMASK;
 407         else
 408                 return flags & EXT4_OTHER_FLMASK;
 409 }
 410
 411 /*
 412  * Inode flags used for atomic set/get
 413  */
 414 enum {
 415         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 416         EXT4_INODE_UNRM         = 1,    /* Undelete */
 417         EXT4_INODE_COMPR        = 2,    /* Compress file */
 418         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 419         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 420         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 421         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 422         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 423 /* Reserved for compression usage... */
 424         EXT4_INODE_DIRTY        = 8,
 425         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 426         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 427         EXT4_INODE_ECOMPR       = 11,   /* Compression error */
 428 /* End compression flags --- maybe not all used */
 429         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 430         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 431         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 432         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 433         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 434         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 435         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 436         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 437         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 438         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 439         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 440 };
 441
 442 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 443 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
 444         printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
 445                 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
 446
 447 /*
 448  * Since it's pretty easy to mix up bit numbers and hex values, and we
 449  * can't do a compile-time test for ENUM values, we use a run-time
 450  * test to make sure that EXT4_XXX_FL is consistent with respect to
 451  * EXT4_INODE_XXX.  If all is well the printk and BUG_ON will all drop
 452  * out so it won't cost any extra space in the compiled kernel image.
 453  * But it's important that these values are the same, since we are
 454  * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
 455  * must be consistent with the values of FS_XXX_FL defined in
 456  * include/linux/fs.h and the on-disk values found in ext2, ext3, and
 457  * ext4 filesystems, and of course the values defined in e2fsprogs.
 458  *
 459  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 460  */
 461 static inline void ext4_check_flag_values(void)
 462 {
 463         CHECK_FLAG_VALUE(SECRM);
 464         CHECK_FLAG_VALUE(UNRM);
 465         CHECK_FLAG_VALUE(COMPR);
 466         CHECK_FLAG_VALUE(SYNC);
 467         CHECK_FLAG_VALUE(IMMUTABLE);
 468         CHECK_FLAG_VALUE(APPEND);
 469         CHECK_FLAG_VALUE(NODUMP);
 470         CHECK_FLAG_VALUE(NOATIME);
 471         CHECK_FLAG_VALUE(DIRTY);
 472         CHECK_FLAG_VALUE(COMPRBLK);
 473         CHECK_FLAG_VALUE(NOCOMPR);
 474         CHECK_FLAG_VALUE(ECOMPR);
 475         CHECK_FLAG_VALUE(INDEX);
 476         CHECK_FLAG_VALUE(IMAGIC);
 477         CHECK_FLAG_VALUE(JOURNAL_DATA);
 478         CHECK_FLAG_VALUE(NOTAIL);
 479         CHECK_FLAG_VALUE(DIRSYNC);
 480         CHECK_FLAG_VALUE(TOPDIR);
 481         CHECK_FLAG_VALUE(HUGE_FILE);
 482         CHECK_FLAG_VALUE(EXTENTS);
 483         CHECK_FLAG_VALUE(EA_INODE);
 484         CHECK_FLAG_VALUE(EOFBLOCKS);
 485         CHECK_FLAG_VALUE(RESERVED);
 486 }
 487
 488 /* Used to pass group descriptor data when online resize is done */
 489 struct ext4_new_group_input {
 490         __u32 group;            /* Group number for this data */
 491         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 492         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 493         __u64 inode_table;      /* Absolute block number of inode table start */
 494         __u32 blocks_count;     /* Total number of blocks in this group */
 495         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 496         __u16 unused;
 497 };
 498
 499 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 500 struct compat_ext4_new_group_input {
 501         u32 group;
 502         compat_u64 block_bitmap;
 503         compat_u64 inode_bitmap;
 504         compat_u64 inode_table;
 505         u32 blocks_count;
 506         u16 reserved_blocks;
 507         u16 unused;
 508 };
 509 #endif
 510
 511 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 512 struct ext4_new_group_data {
 513         __u32 group;
 514         __u64 block_bitmap;
 515         __u64 inode_bitmap;
 516         __u64 inode_table;
 517         __u32 blocks_count;
 518         __u16 reserved_blocks;
 519         __u16 unused;
 520         __u32 free_blocks_count;
 521 };
 522
 523 /* Indexes used to index group tables in ext4_new_group_data */
 524 enum {
 525         BLOCK_BITMAP = 0,       /* block bitmap */
 526         INODE_BITMAP,           /* inode bitmap */
 527         INODE_TABLE,            /* inode tables */
 528         GROUP_TABLE_COUNT,
 529 };
 530
 531 /*
 532  * Flags used by ext4_map_blocks()
 533  */
 534         /* Allocate any needed blocks and/or convert an unitialized
 535            extent to be an initialized ext4 */
 536 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 537         /* Request the creation of an unitialized extent */
 538 #define EXT4_GET_BLOCKS_UNINIT_EXT              0x0002
 539 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT       (EXT4_GET_BLOCKS_UNINIT_EXT|\
 540                                                  EXT4_GET_BLOCKS_CREATE)
 541         /* Caller is from the delayed allocation writeout path,
 542            so set the magic i_delalloc_reserve_flag after taking the
 543            inode allocation semaphore for */
 544 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 545         /* caller is from the direct IO path, request to creation of an
 546         unitialized extents if not allocated, split the uninitialized
 547         extent if blocks has been preallocated already*/
 548 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 549 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 550 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 551                                          EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
 552         /* Convert extent to initialized after IO complete */
 553 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 554                                          EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
 555         /* Punch out blocks of an extent */
 556 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT           0x0020
 557         /* Don't normalize allocation size (used for fallocate) */
 558 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 559         /* Request will not result in inode size update (user for fallocate) */
 560 #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
 561
 562 /*
 563  * Flags used by ext4_free_blocks
 564  */
 565 #define EXT4_FREE_BLOCKS_METADATA       0x0001
 566 #define EXT4_FREE_BLOCKS_FORGET         0x0002
 567 #define EXT4_FREE_BLOCKS_VALIDATED      0x0004
 568 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
 569 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 570 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 571
 572 /*
 573  * Flags used by ext4_discard_partial_page_buffers
 574  */
 575 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED   0x0001
 576
 577 /*
 578  * ioctl commands
 579  */
 580 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 581 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 582 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 583 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 584 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 585 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 586 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 587 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 588 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 589 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 590 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 591  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 592  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 593 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 594 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 595 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 596
 597 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 598 /*
 599  * ioctl commands in 32 bit emulation
 600  */
 601 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 602 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 603 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 604 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 605 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 606 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 607 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 608 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 609 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 610 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 611 #endif
 612
 613 /* Max physical block we can address w/o extents */
 614 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 615
 616 /*
 617  * Structure of an inode on the disk
 618  */
 619 struct ext4_inode {
 620         __le16  i_mode;         /* File mode */
 621         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 622         __le32  i_size_lo;      /* Size in bytes */
 623         __le32  i_atime;        /* Access time */
 624         __le32  i_ctime;        /* Inode Change time */
 625         __le32  i_mtime;        /* Modification time */
 626         __le32  i_dtime;        /* Deletion Time */
 627         __le16  i_gid;          /* Low 16 bits of Group Id */
 628         __le16  i_links_count;  /* Links count */
 629         __le32  i_blocks_lo;    /* Blocks count */
 630         __le32  i_flags;        /* File flags */
 631         union {
 632                 struct {
 633                         __le32  l_i_version;
 634                 } linux1;
 635                 struct {
 636                         __u32  h_i_translator;
 637                 } hurd1;
 638                 struct {
 639                         __u32  m_i_reserved1;
 640                 } masix1;
 641         } osd1;                         /* OS dependent 1 */
 642         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 643         __le32  i_generation;   /* File version (for NFS) */
 644         __le32  i_file_acl_lo;  /* File ACL */
 645         __le32  i_size_high;
 646         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 647         union {
 648                 struct {
 649                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 650                         __le16  l_i_file_acl_high;
 651                         __le16  l_i_uid_high;   /* these 2 fields */
 652                         __le16  l_i_gid_high;   /* were reserved2[0] */
 653                         __u32   l_i_reserved2;
 654                 } linux2;
 655                 struct {
 656                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 657                         __u16   h_i_mode_high;
 658                         __u16   h_i_uid_high;
 659                         __u16   h_i_gid_high;
 660                         __u32   h_i_author;
 661                 } hurd2;
 662                 struct {
 663                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 664                         __le16  m_i_file_acl_high;
 665                         __u32   m_i_reserved2[2];
 666                 } masix2;
 667         } osd2;                         /* OS dependent 2 */
 668         __le16  i_extra_isize;
 669         __le16  i_pad1;
 670         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 671         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 672         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 673         __le32  i_crtime;       /* File Creation time */
 674         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 675         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 676 };
 677
 678 struct move_extent {
 679         __u32 reserved;         /* should be zero */
 680         __u32 donor_fd;         /* donor file descriptor */
 681         __u64 orig_start;       /* logical start offset in block for orig */
 682         __u64 donor_start;      /* logical start offset in block for donor */
 683         __u64 len;              /* block length to be moved */
 684         __u64 moved_len;        /* moved block length */
 685 };
 686
 687 #define EXT4_EPOCH_BITS 2
 688 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 689 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 690
 691 /*
 692  * Extended fields will fit into an inode if the filesystem was formatted
 693  * with large inodes (-I 256 or larger) and there are not currently any EAs
 694  * consuming all of the available space. For new inodes we always reserve
 695  * enough space for the kernel's known extended fields, but for inodes
 696  * created with an old kernel this might not have been the case. None of
 697  * the extended inode fields is critical for correct filesystem operation.
 698  * This macro checks if a certain field fits in the inode. Note that
 699  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 700  */
 701 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 702         ((offsetof(typeof(*ext4_inode), field) +        \
 703           sizeof((ext4_inode)->field))                  \
 704         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 705             (einode)->i_extra_isize))                   \
 706
 707 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 708 {
 709        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 710                            (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
 711                           ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
 712 }
 713
 714 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 715 {
 716        if (sizeof(time->tv_sec) > 4)
 717                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 718                                << 32;
 719        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 720 }
 721
 722 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 723 do {                                                                           \
 724         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 725         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 726                 (raw_inode)->xtime ## _extra =                                 \
 727                                 ext4_encode_extra_time(&(inode)->xtime);       \
 728 } while (0)
 729
 730 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 731 do {                                                                           \
 732         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 733                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 734         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 735                 (raw_inode)->xtime ## _extra =                                 \
 736                                 ext4_encode_extra_time(&(einode)->xtime);      \
 737 } while (0)
 738
 739 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 740 do {                                                                           \
 741         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 742         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 743                 ext4_decode_extra_time(&(inode)->xtime,                        \
 744                                        raw_inode->xtime ## _extra);            \
 745         else                                                                   \
 746                 (inode)->xtime.tv_nsec = 0;                                    \
 747 } while (0)
 748
 749 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 750 do {                                                                           \
 751         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 752                 (einode)->xtime.tv_sec =                                       \
 753                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 754         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 755                 ext4_decode_extra_time(&(einode)->xtime,                       \
 756                                        raw_inode->xtime ## _extra);            \
 757         else                                                                   \
 758                 (einode)->xtime.tv_nsec = 0;                                   \
 759 } while (0)
 760
 761 #define i_disk_version osd1.linux1.l_i_version
 762
 763 #if defined(__KERNEL__) || defined(__linux__)
 764 #define i_reserved1     osd1.linux1.l_i_reserved1
 765 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 766 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 767 #define i_uid_low       i_uid
 768 #define i_gid_low       i_gid
 769 #define i_uid_high      osd2.linux2.l_i_uid_high
 770 #define i_gid_high      osd2.linux2.l_i_gid_high
 771 #define i_reserved2     osd2.linux2.l_i_reserved2
 772
 773 #elif defined(__GNU__)
 774
 775 #define i_translator    osd1.hurd1.h_i_translator
 776 #define i_uid_high      osd2.hurd2.h_i_uid_high
 777 #define i_gid_high      osd2.hurd2.h_i_gid_high
 778 #define i_author        osd2.hurd2.h_i_author
 779
 780 #elif defined(__masix__)
 781
 782 #define i_reserved1     osd1.masix1.m_i_reserved1
 783 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 784 #define i_reserved2     osd2.masix2.m_i_reserved2
 785
 786 #endif /* defined(__KERNEL__) || defined(__linux__) */
 787
 788 /*
 789  * storage for cached extent
 790  * If ec_len == 0, then the cache is invalid.
 791  * If ec_start == 0, then the cache represents a gap (null mapping)
 792  */
 793 struct ext4_ext_cache {
 794         ext4_fsblk_t    ec_start;
 795         ext4_lblk_t     ec_block;
 796         __u32           ec_len; /* must be 32bit to return holes */
 797 };
 798
 799 /*
 800  * fourth extended file system inode data in memory
 801  */
 802 struct ext4_inode_info {
 803         __le32  i_data[15];     /* unconverted */
 804         __u32   i_dtime;
 805         ext4_fsblk_t    i_file_acl;
 806
 807         /*
 808          * i_block_group is the number of the block group which contains
 809          * this file's inode.  Constant across the lifetime of the inode,
 810          * it is ued for making block allocation decisions - we try to
 811          * place a file's data blocks near its inode block, and new inodes
 812          * near to their parent directory's inode.
 813          */
 814         ext4_group_t    i_block_group;
 815         ext4_lblk_t     i_dir_start_lookup;
 816 #if (BITS_PER_LONG < 64)
 817         unsigned long   i_state_flags;          /* Dynamic state flags */
 818 #endif
 819         unsigned long   i_flags;
 820
 821 #ifdef CONFIG_EXT4_FS_XATTR
 822         /*
 823          * Extended attributes can be read independently of the main file
 824          * data. Taking i_mutex even when reading would cause contention
 825          * between readers of EAs and writers of regular file data, so
 826          * instead we synchronize on xattr_sem when reading or changing
 827          * EAs.
 828          */
 829         struct rw_semaphore xattr_sem;
 830 #endif
 831
 832         struct list_head i_orphan;      /* unlinked but open inodes */
 833
 834         /*
 835          * i_disksize keeps track of what the inode size is ON DISK, not
 836          * in memory.  During truncate, i_size is set to the new size by
 837          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 838          * set i_disksize to 0 until the truncate is actually under way.
 839          *
 840          * The intent is that i_disksize always represents the blocks which
 841          * are used by this file.  This allows recovery to restart truncate
 842          * on orphans if we crash during truncate.  We actually write i_disksize
 843          * into the on-disk inode when writing inodes out, instead of i_size.
 844          *
 845          * The only time when i_disksize and i_size may be different is when
 846          * a truncate is in progress.  The only things which change i_disksize
 847          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 848          */
 849         loff_t  i_disksize;
 850
 851         /*
 852          * i_data_sem is for serialising ext4_truncate() against
 853          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 854          * data tree are chopped off during truncate. We can't do that in
 855          * ext4 because whenever we perform intermediate commits during
 856          * truncate, the inode and all the metadata blocks *must* be in a
 857          * consistent state which allows truncation of the orphans to restart
 858          * during recovery.  Hence we must fix the get_block-vs-truncate race
 859          * by other means, so we have i_data_sem.
 860          */
 861         struct rw_semaphore i_data_sem;
 862         struct inode vfs_inode;
 863         struct jbd2_inode *jinode;
 864
 865         struct ext4_ext_cache i_cached_extent;
 866         /*
 867          * File creation time. Its function is same as that of
 868          * struct timespec i_{a,c,m}time in the generic inode.
 869          */
 870         struct timespec i_crtime;
 871
 872         /* mballoc */
 873         struct list_head i_prealloc_list;
 874         spinlock_t i_prealloc_lock;
 875
 876         /* ialloc */
 877         ext4_group_t    i_last_alloc_group;
 878
 879         /* allocation reservation info for delalloc */
 880         /* In case of bigalloc, these refer to clusters rather than blocks */
 881         unsigned int i_reserved_data_blocks;
 882         unsigned int i_reserved_meta_blocks;
 883         unsigned int i_allocated_meta_blocks;
 884         ext4_lblk_t i_da_metadata_calc_last_lblock;
 885         int i_da_metadata_calc_len;
 886
 887         /* on-disk additional length */
 888         __u16 i_extra_isize;
 889
 890 #ifdef CONFIG_QUOTA
 891         /* quota space reservation, managed internally by quota code */
 892         qsize_t i_reserved_quota;
 893 #endif
 894
 895         /* completed IOs that might need unwritten extents handling */
 896         struct list_head i_completed_io_list;
 897         spinlock_t i_completed_io_lock;
 898         atomic_t i_ioend_count; /* Number of outstanding io_end structs */
 899         /* current io_end structure for async DIO write*/
 900         ext4_io_end_t *cur_aio_dio;
 901         atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
 902
 903         spinlock_t i_block_reservation_lock;
 904
 905         /*
 906          * Transactions that contain inode's metadata needed to complete
 907          * fsync and fdatasync, respectively.
 908          */
 909         tid_t i_sync_tid;
 910         tid_t i_datasync_tid;
 911 #ifdef CONFIG_EXT4_FS_RICHACL
 912         struct richacl   *i_richacl;
 913 #endif
 914
 915 };
 916
 917 /*
 918  * File system states
 919  */
 920 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 921 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 922 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 923
 924 /*
 925  * Misc. filesystem flags
 926  */
 927 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 928 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 929 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 930
 931 /*
 932  * Mount flags
 933  */
 934 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 935 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 936 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 937 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 938 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 939 #define EXT4_MOUNT_ERRORS_MASK          0x00070
 940 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 941 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 942 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 943 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 944 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 945 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 946 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 947 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 948 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 949 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 950 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
 951 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 952 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 953 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 954 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 955 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
 956 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 957 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 958 #define EXT4_MOUNT_MBLK_IO_SUBMIT       0x4000000 /* multi-block io submits */
 959 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
 960 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
 961 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
 962 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
 963 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
 964
 965 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
 966                                                       specified delalloc */
 967
 968 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
 969                                                 ~EXT4_MOUNT_##opt
 970 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
 971                                                 EXT4_MOUNT_##opt
 972 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 973                                          EXT4_MOUNT_##opt)
 974
 975 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
 976                                                 ~EXT4_MOUNT2_##opt
 977 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
 978                                                 EXT4_MOUNT2_##opt
 979 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
 980                                          EXT4_MOUNT2_##opt)
 981
 982 #define ext4_test_and_set_bit           __test_and_set_bit_le
 983 #define ext4_set_bit                    __set_bit_le
 984 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 985 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
 986 #define ext4_clear_bit                  __clear_bit_le
 987 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 988 #define ext4_test_bit                   test_bit_le
 989 #define ext4_find_next_zero_bit         find_next_zero_bit_le
 990 #define ext4_find_next_bit              find_next_bit_le
 991
 992 extern void ext4_set_bits(void *bm, int cur, int len);
 993
 994 /*
 995  * Maximal mount counts between two filesystem checks
 996  */
 997 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 998 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 999
1000 /*
1001  * Behaviour when detecting errors
1002  */
1003 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1004 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1005 #define EXT4_ERRORS_PANIC               3       /* Panic */
1006 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1007
1008 /*
1009  * Structure of the super block
1010  */
1011 struct ext4_super_block {
1012 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1013         __le32  s_blocks_count_lo;      /* Blocks count */
1014         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1015         __le32  s_free_blocks_count_lo; /* Free blocks count */
1016 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1017         __le32  s_first_data_block;     /* First Data Block */
1018         __le32  s_log_block_size;       /* Block size */
1019         __le32  s_log_cluster_size;     /* Allocation cluster size */
1020 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1021         __le32  s_clusters_per_group;   /* # Clusters per group */
1022         __le32  s_inodes_per_group;     /* # Inodes per group */
1023         __le32  s_mtime;                /* Mount time */
1024 /*30*/  __le32  s_wtime;                /* Write time */
1025         __le16  s_mnt_count;            /* Mount count */
1026         __le16  s_max_mnt_count;        /* Maximal mount count */
1027         __le16  s_magic;                /* Magic signature */
1028         __le16  s_state;                /* File system state */
1029         __le16  s_errors;               /* Behaviour when detecting errors */
1030         __le16  s_minor_rev_level;      /* minor revision level */
1031 /*40*/  __le32  s_lastcheck;            /* time of last check */
1032         __le32  s_checkinterval;        /* max. time between checks */
1033         __le32  s_creator_os;           /* OS */
1034         __le32  s_rev_level;            /* Revision level */
1035 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1036         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1037         /*
1038          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1039          *
1040          * Note: the difference between the compatible feature set and
1041          * the incompatible feature set is that if there is a bit set
1042          * in the incompatible feature set that the kernel doesn't
1043          * know about, it should refuse to mount the filesystem.
1044          *
1045          * e2fsck's requirements are more strict; if it doesn't know
1046          * about a feature in either the compatible or incompatible
1047          * feature set, it must abort and not try to meddle with
1048          * things it doesn't understand...
1049          */
1050         __le32  s_first_ino;            /* First non-reserved inode */
1051         __le16  s_inode_size;           /* size of inode structure */
1052         __le16  s_block_group_nr;       /* block group # of this superblock */
1053         __le32  s_feature_compat;       /* compatible feature set */
1054 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1055         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1056 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1057 /*78*/  char    s_volume_name[16];      /* volume name */
1058 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
1059 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1060         /*
1061          * Performance hints.  Directory preallocation should only
1062          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1063          */
1064         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1065         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1066         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1067         /*
1068          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1069          */
1070 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1071 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1072         __le32  s_journal_dev;          /* device number of journal file */
1073         __le32  s_last_orphan;          /* start of list of inodes to delete */
1074         __le32  s_hash_seed[4];         /* HTREE hash seed */
1075         __u8    s_def_hash_version;     /* Default hash version to use */
1076         __u8    s_jnl_backup_type;
1077         __le16  s_desc_size;            /* size of group descriptor */
1078 /*100*/ __le32  s_default_mount_opts;
1079         __le32  s_first_meta_bg;        /* First metablock block group */
1080         __le32  s_mkfs_time;            /* When the filesystem was created */
1081         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1082         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1083 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1084         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1085         __le32  s_free_blocks_count_hi; /* Free blocks count */
1086         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1087         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1088         __le32  s_flags;                /* Miscellaneous flags */
1089         __le16  s_raid_stride;          /* RAID stride */
1090         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1091         __le64  s_mmp_block;            /* Block for multi-mount protection */
1092         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1093         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1094         __u8    s_reserved_char_pad;
1095         __le16  s_reserved_pad;
1096         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1097         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1098         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1099         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1100                                               snapshot's future use */
1101         __le32  s_snapshot_list;        /* inode number of the head of the
1102                                            on-disk snapshot list */
1103 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1104         __le32  s_error_count;          /* number of fs errors */
1105         __le32  s_first_error_time;     /* first time an error happened */
1106         __le32  s_first_error_ino;      /* inode involved in first error */
1107         __le64  s_first_error_block;    /* block involved of first error */
1108         __u8    s_first_error_func[32]; /* function where the error happened */
1109         __le32  s_first_error_line;     /* line number where error happened */
1110         __le32  s_last_error_time;      /* most recent time of an error */
1111         __le32  s_last_error_ino;       /* inode involved in last error */
1112         __le32  s_last_error_line;      /* line number where error happened */
1113         __le64  s_last_error_block;     /* block involved of last error */
1114         __u8    s_last_error_func[32];  /* function where the error happened */
1115 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1116         __u8    s_mount_opts[64];
1117         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1118         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1119         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1120         __le32  s_reserved[109];        /* Padding to the end of the block */
1121 };
1122
1123 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1124
1125 #ifdef __KERNEL__
1126
1127 /*
1128  * run-time mount flags
1129  */
1130 #define EXT4_MF_MNTDIR_SAMPLED  0x0001
1131 #define EXT4_MF_FS_ABORTED      0x0002  /* Fatal error detected */
1132
1133 /*
1134  * fourth extended-fs super-block data in memory
1135  */
1136 struct ext4_sb_info {
1137         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1138         unsigned long s_inodes_per_block;/* Number of inodes per block */
1139         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1140         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1141         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1142         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1143         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1144         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1145         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1146         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1147         unsigned long s_overhead_last;  /* Last calculated overhead */
1148         unsigned long s_blocks_last;    /* Last seen block count */
1149         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1150         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1151         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1152         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1153         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1154         struct buffer_head **s_group_desc;
1155         unsigned int s_mount_opt;
1156         unsigned int s_mount_opt2;
1157         unsigned int s_mount_flags;
1158         unsigned int s_def_mount_opt;
1159         ext4_fsblk_t s_sb_block;
1160         uid_t s_resuid;
1161         gid_t s_resgid;
1162         unsigned short s_mount_state;
1163         unsigned short s_pad;
1164         int s_addr_per_block_bits;
1165         int s_desc_per_block_bits;
1166         int s_inode_size;
1167         int s_first_ino;
1168         unsigned int s_inode_readahead_blks;
1169         unsigned int s_inode_goal;
1170         spinlock_t s_next_gen_lock;
1171         u32 s_next_generation;
1172         u32 s_hash_seed[4];
1173         int s_def_hash_version;
1174         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1175         struct percpu_counter s_freeclusters_counter;
1176         struct percpu_counter s_freeinodes_counter;
1177         struct percpu_counter s_dirs_counter;
1178         struct percpu_counter s_dirtyclusters_counter;
1179         struct blockgroup_lock *s_blockgroup_lock;
1180         struct proc_dir_entry *s_proc;
1181         struct kobject s_kobj;
1182         struct completion s_kobj_unregister;
1183
1184         /* Journaling */
1185         struct journal_s *s_journal;
1186         struct list_head s_orphan;
1187         struct mutex s_orphan_lock;
1188         unsigned long s_resize_flags;           /* Flags indicating if there
1189                                                    is a resizer */
1190         unsigned long s_commit_interval;
1191         u32 s_max_batch_time;
1192         u32 s_min_batch_time;
1193         struct block_device *journal_bdev;
1194 #ifdef CONFIG_QUOTA
1195         char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */
1196         int s_jquota_fmt;                       /* Format of quota to use */
1197 #endif
1198         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1199         struct rb_root system_blks;
1200
1201 #ifdef EXTENTS_STATS
1202         /* ext4 extents stats */
1203         unsigned long s_ext_min;
1204         unsigned long s_ext_max;
1205         unsigned long s_depth_max;
1206         spinlock_t s_ext_stats_lock;
1207         unsigned long s_ext_blocks;
1208         unsigned long s_ext_extents;
1209 #endif
1210
1211         /* for buddy allocator */
1212         struct ext4_group_info ***s_group_info;
1213         struct inode *s_buddy_cache;
1214         spinlock_t s_md_lock;
1215         unsigned short *s_mb_offsets;
1216         unsigned int *s_mb_maxs;
1217
1218         /* tunables */
1219         unsigned long s_stripe;
1220         unsigned int s_mb_stream_request;
1221         unsigned int s_mb_max_to_scan;
1222         unsigned int s_mb_min_to_scan;
1223         unsigned int s_mb_stats;
1224         unsigned int s_mb_order2_reqs;
1225         unsigned int s_mb_group_prealloc;
1226         unsigned int s_max_writeback_mb_bump;
1227         /* where last allocation was done - for stream allocation */
1228         unsigned long s_mb_last_group;
1229         unsigned long s_mb_last_start;
1230
1231         /* stats for buddy allocator */
1232         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1233         atomic_t s_bal_success; /* we found long enough chunks */
1234         atomic_t s_bal_allocated;       /* in blocks */
1235         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1236         atomic_t s_bal_goals;   /* goal hits */
1237         atomic_t s_bal_breaks;  /* too long searches */
1238         atomic_t s_bal_2orders; /* 2^order hits */
1239         spinlock_t s_bal_lock;
1240         unsigned long s_mb_buddies_generated;
1241         unsigned long long s_mb_generation_time;
1242         atomic_t s_mb_lost_chunks;
1243         atomic_t s_mb_preallocated;
1244         atomic_t s_mb_discarded;
1245         atomic_t s_lock_busy;
1246
1247         /* locality groups */
1248         struct ext4_locality_group __percpu *s_locality_groups;
1249
1250         /* for write statistics */
1251         unsigned long s_sectors_written_start;
1252         u64 s_kbytes_written;
1253
1254         unsigned int s_log_groups_per_flex;
1255         struct flex_groups *s_flex_groups;
1256
1257         /* workqueue for dio unwritten */
1258         struct workqueue_struct *dio_unwritten_wq;
1259
1260         /* timer for periodic error stats printing */
1261         struct timer_list s_err_report;
1262
1263         /* Lazy inode table initialization info */
1264         struct ext4_li_request *s_li_request;
1265         /* Wait multiplier for lazy initialization thread */
1266         unsigned int s_li_wait_mult;
1267
1268         /* Kernel thread for multiple mount protection */
1269         struct task_struct *s_mmp_tsk;
1270
1271         /* record the last minlen when FITRIM is called. */
1272         atomic_t s_last_trim_minblks;
1273 };
1274
1275 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1276 {
1277         return sb->s_fs_info;
1278 }
1279 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1280 {
1281         return container_of(inode, struct ext4_inode_info, vfs_inode);
1282 }
1283
1284 static inline struct timespec ext4_current_time(struct inode *inode)
1285 {
1286         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1287                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1288 }
1289
1290 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1291 {
1292         return ino == EXT4_ROOT_INO ||
1293                 ino == EXT4_JOURNAL_INO ||
1294                 ino == EXT4_RESIZE_INO ||
1295                 (ino >= EXT4_FIRST_INO(sb) &&
1296                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1297 }
1298
1299 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1300                                               struct ext4_io_end *io_end)
1301 {
1302         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1303                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1304                 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
1305         }
1306 }
1307
1308 /*
1309  * Inode dynamic state flags
1310  */
1311 enum {
1312         EXT4_STATE_JDATA,               /* journaled data exists */
1313         EXT4_STATE_NEW,                 /* inode is newly created */
1314         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1315         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1316         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1317         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1318         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1319         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1320         EXT4_STATE_DELALLOC_RESERVED,   /* blks already reserved for delalloc */
1321 };
1322
1323 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1324 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1325 {                                                                       \
1326         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1327 }                                                                       \
1328 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1329 {                                                                       \
1330         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1331 }                                                                       \
1332 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1333 {                                                                       \
1334         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1335 }
1336
1337 EXT4_INODE_BIT_FNS(flag, flags, 0)
1338 #if (BITS_PER_LONG < 64)
1339 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1340
1341 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1342 {
1343         (ei)->i_state_flags = 0;
1344 }
1345 #else
1346 EXT4_INODE_BIT_FNS(state, flags, 32)
1347
1348 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1349 {
1350         /* We depend on the fact that callers will set i_flags */
1351 }
1352 #endif
1353 #else
1354 /* Assume that user mode programs are passing in an ext4fs superblock, not
1355  * a kernel struct super_block.  This will allow us to call the feature-test
1356  * macros from user land. */
1357 #define EXT4_SB(sb)     (sb)
1358 #endif
1359
1360 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1361
1362 /*
1363  * Codes for operating systems
1364  */
1365 #define EXT4_OS_LINUX           0
1366 #define EXT4_OS_HURD            1
1367 #define EXT4_OS_MASIX           2
1368 #define EXT4_OS_FREEBSD         3
1369 #define EXT4_OS_LITES           4
1370
1371 /*
1372  * Revision levels
1373  */
1374 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1375 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1376
1377 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1378 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1379
1380 #define EXT4_GOOD_OLD_INODE_SIZE 128
1381
1382 /*
1383  * Feature set definitions
1384  */
1385
1386 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
1387         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1388 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
1389         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1390 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
1391         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1392 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
1393         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1394 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
1395         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1396 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
1397         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1398 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
1399         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1400 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
1401         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1402 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
1403         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1404
1405 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1406 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1407 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1408 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1409 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1410 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1411
1412 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1413 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1414 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1415 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1416 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1417 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1418 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1419 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1420 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
1421 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
1422
1423 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1424 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1425 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1426 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1427 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1428 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1429 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1430 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1431 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1432 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1433 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1434 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM  0x2000 /* use crc32c for bg */
1435 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
1436 #define EXT4_FEATURE_INCOMPAT_INLINEDATA        0x8000 /* data in inode */
1437
1438 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1439 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1440                                          EXT4_FEATURE_INCOMPAT_META_BG)
1441 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1442                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1443                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1444
1445 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1446 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1447                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1448                                          EXT4_FEATURE_INCOMPAT_META_BG)
1449 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1450                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1451                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1452
1453 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
1454 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1455                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1456                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1457                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1458                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1459                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1460                                          EXT4_FEATURE_INCOMPAT_MMP)
1461 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1462                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1463                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1464                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1465                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1466                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1467                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1468                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC)
1469
1470 /*
1471  * Default values for user and/or group using reserved blocks
1472  */
1473 #define EXT4_DEF_RESUID         0
1474 #define EXT4_DEF_RESGID         0
1475
1476 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1477
1478 /*
1479  * Default mount options
1480  */
1481 #define EXT4_DEFM_DEBUG         0x0001
1482 #define EXT4_DEFM_BSDGROUPS     0x0002
1483 #define EXT4_DEFM_XATTR_USER    0x0004
1484 #define EXT4_DEFM_ACL           0x0008
1485 #define EXT4_DEFM_UID16         0x0010
1486 #define EXT4_DEFM_JMODE         0x0060
1487 #define EXT4_DEFM_JMODE_DATA    0x0020
1488 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1489 #define EXT4_DEFM_JMODE_WBACK   0x0060
1490 #define EXT4_DEFM_NOBARRIER     0x0100
1491 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1492 #define EXT4_DEFM_DISCARD       0x0400
1493 #define EXT4_DEFM_NODELALLOC    0x0800
1494
1495 /*
1496  * Default journal batch times
1497  */
1498 #define EXT4_DEF_MIN_BATCH_TIME 0
1499 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1500
1501 /*
1502  * Minimum number of groups in a flexgroup before we separate out
1503  * directories into the first block group of a flexgroup
1504  */
1505 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1506
1507 /*
1508  * Structure of a directory entry
1509  */
1510 #define EXT4_NAME_LEN 255
1511
1512 struct ext4_dir_entry {
1513         __le32  inode;                  /* Inode number */
1514         __le16  rec_len;                /* Directory entry length */
1515         __le16  name_len;               /* Name length */
1516         char    name[EXT4_NAME_LEN];    /* File name */
1517 };
1518
1519 /*
1520  * The new version of the directory entry.  Since EXT4 structures are
1521  * stored in intel byte order, and the name_len field could never be
1522  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1523  * file_type field.
1524  */
1525 struct ext4_dir_entry_2 {
1526         __le32  inode;                  /* Inode number */
1527         __le16  rec_len;                /* Directory entry length */
1528         __u8    name_len;               /* Name length */
1529         __u8    file_type;
1530         char    name[EXT4_NAME_LEN];    /* File name */
1531 };
1532
1533 /*
1534  * Ext4 directory file types.  Only the low 3 bits are used.  The
1535  * other bits are reserved for now.
1536  */
1537 #define EXT4_FT_UNKNOWN         0
1538 #define EXT4_FT_REG_FILE        1
1539 #define EXT4_FT_DIR             2
1540 #define EXT4_FT_CHRDEV          3
1541 #define EXT4_FT_BLKDEV          4
1542 #define EXT4_FT_FIFO            5
1543 #define EXT4_FT_SOCK            6
1544 #define EXT4_FT_SYMLINK         7
1545
1546 #define EXT4_FT_MAX             8
1547
1548 /*
1549  * EXT4_DIR_PAD defines the directory entries boundaries
1550  *
1551  * NOTE: It must be a multiple of 4
1552  */
1553 #define EXT4_DIR_PAD                    4
1554 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1555 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1556                                          ~EXT4_DIR_ROUND)
1557 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1558
1559 /*
1560  * If we ever get support for fs block sizes > page_size, we'll need
1561  * to remove the #if statements in the next two functions...
1562  */
1563 static inline unsigned int
1564 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1565 {
1566         unsigned len = le16_to_cpu(dlen);
1567
1568 #if (PAGE_CACHE_SIZE >= 65536)
1569         if (len == EXT4_MAX_REC_LEN || len == 0)
1570                 return blocksize;
1571         return (len & 65532) | ((len & 3) << 16);
1572 #else
1573         return len;
1574 #endif
1575 }
1576
1577 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1578 {
1579         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1580                 BUG();
1581 #if (PAGE_CACHE_SIZE >= 65536)
1582         if (len < 65536)
1583                 return cpu_to_le16(len);
1584         if (len == blocksize) {
1585                 if (blocksize == 65536)
1586                         return cpu_to_le16(EXT4_MAX_REC_LEN);
1587                 else
1588                         return cpu_to_le16(0);
1589         }
1590         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1591 #else
1592         return cpu_to_le16(len);
1593 #endif
1594 }
1595
1596 /*
1597  * Hash Tree Directory indexing
1598  * (c) Daniel Phillips, 2001
1599  */
1600
1601 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1602                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1603                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1604 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1605 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1606
1607 /* Legal values for the dx_root hash_version field: */
1608
1609 #define DX_HASH_LEGACY          0
1610 #define DX_HASH_HALF_MD4        1
1611 #define DX_HASH_TEA             2
1612 #define DX_HASH_LEGACY_UNSIGNED 3
1613 #define DX_HASH_HALF_MD4_UNSIGNED       4
1614 #define DX_HASH_TEA_UNSIGNED            5
1615
1616 #ifdef __KERNEL__
1617
1618 /* hash info structure used by the directory hash */
1619 struct dx_hash_info
1620 {
1621         u32             hash;
1622         u32             minor_hash;
1623         int             hash_version;
1624         u32             *seed;
1625 };
1626
1627
1628 /* 32 and 64 bit signed EOF for dx directories */
1629 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
1630 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
1631
1632
1633 /*
1634  * Control parameters used by ext4_htree_next_block
1635  */
1636 #define HASH_NB_ALWAYS          1
1637
1638
1639 /*
1640  * Describe an inode's exact location on disk and in memory
1641  */
1642 struct ext4_iloc
1643 {
1644         struct buffer_head *bh;
1645         unsigned long offset;
1646         ext4_group_t block_group;
1647 };
1648
1649 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1650 {
1651         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1652 }
1653
1654 /*
1655  * This structure is stuffed into the struct file's private_data field
1656  * for directories.  It is where we put information so that we can do
1657  * readdir operations in hash tree order.
1658  */
1659 struct dir_private_info {
1660         struct rb_root  root;
1661         struct rb_node  *curr_node;
1662         struct fname    *extra_fname;
1663         loff_t          last_pos;
1664         __u32           curr_hash;
1665         __u32           curr_minor_hash;
1666         __u32           next_hash;
1667 };
1668
1669 /* calculate the first block number of the group */
1670 static inline ext4_fsblk_t
1671 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1672 {
1673         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1674                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1675 }
1676
1677 /*
1678  * Special error return code only used by dx_probe() and its callers.
1679  */
1680 #define ERR_BAD_DX_DIR  -75000
1681
1682 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1683                         ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1684
1685 /*
1686  * Timeout and state flag for lazy initialization inode thread.
1687  */
1688 #define EXT4_DEF_LI_WAIT_MULT                   10
1689 #define EXT4_DEF_LI_MAX_START_DELAY             5
1690 #define EXT4_LAZYINIT_QUIT                      0x0001
1691 #define EXT4_LAZYINIT_RUNNING                   0x0002
1692
1693 /*
1694  * Lazy inode table initialization info
1695  */
1696 struct ext4_lazy_init {
1697         unsigned long           li_state;
1698         struct list_head        li_request_list;
1699         struct mutex            li_list_mtx;
1700 };
1701
1702 struct ext4_li_request {
1703         struct super_block      *lr_super;
1704         struct ext4_sb_info     *lr_sbi;
1705         ext4_group_t            lr_next_group;
1706         struct list_head        lr_request;
1707         unsigned long           lr_next_sched;
1708         unsigned long           lr_timeout;
1709 };
1710
1711 struct ext4_features {
1712         struct kobject f_kobj;
1713         struct completion f_kobj_unregister;
1714 };
1715
1716 /*
1717  * This structure will be used for multiple mount protection. It will be
1718  * written into the block number saved in the s_mmp_block field in the
1719  * superblock. Programs that check MMP should assume that if
1720  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1721  * to use the filesystem, regardless of how old the timestamp is.
1722  */
1723 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
1724 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1725 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
1726 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
1727
1728 struct mmp_struct {
1729         __le32  mmp_magic;              /* Magic number for MMP */
1730         __le32  mmp_seq;                /* Sequence no. updated periodically */
1731
1732         /*
1733          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1734          * purposes and do not affect the correctness of the algorithm
1735          */
1736         __le64  mmp_time;               /* Time last updated */
1737         char    mmp_nodename[64];       /* Node which last updated MMP block */
1738         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
1739
1740         /*
1741          * mmp_check_interval is used to verify if the MMP block has been
1742          * updated on the block device. The value is updated based on the
1743          * maximum time to write the MMP block during an update cycle.
1744          */
1745         __le16  mmp_check_interval;
1746
1747         __le16  mmp_pad1;
1748         __le32  mmp_pad2[227];
1749 };
1750
1751 /* arguments passed to the mmp thread */
1752 struct mmpd_data {
1753         struct buffer_head *bh; /* bh from initial read_mmp_block() */
1754         struct super_block *sb;  /* super block of the fs */
1755 };
1756
1757 /*
1758  * Check interval multiplier
1759  * The MMP block is written every update interval and initially checked every
1760  * update interval x the multiplier (the value is then adapted based on the
1761  * write latency). The reason is that writes can be delayed under load and we
1762  * don't want readers to incorrectly assume that the filesystem is no longer
1763  * in use.
1764  */
1765 #define EXT4_MMP_CHECK_MULT             2UL
1766
1767 /*
1768  * Minimum interval for MMP checking in seconds.
1769  */
1770 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
1771
1772 /*
1773  * Maximum interval for MMP checking in seconds.
1774  */
1775 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
1776
1777 /*
1778  * Function prototypes
1779  */
1780
1781 /*
1782  * Ok, these declarations are also in <linux/kernel.h> but none of the
1783  * ext4 source programs needs to include it so they are duplicated here.
1784  */
1785 # define NORET_TYPE     /**/
1786 # define ATTRIB_NORET   __attribute__((noreturn))
1787 # define NORET_AND      noreturn,
1788
1789 /* bitmap.c */
1790 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1791
1792 /* balloc.c */
1793 extern unsigned int ext4_block_group(struct super_block *sb,
1794                         ext4_fsblk_t blocknr);
1795 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1796                         ext4_fsblk_t blocknr);
1797 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1798 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1799                         ext4_group_t group);
1800 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1801                                          ext4_fsblk_t goal,
1802                                          unsigned int flags,
1803                                          unsigned long *count,
1804                                          int *errp);
1805 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1806                                     s64 nclusters, unsigned int flags);
1807 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1808 extern void ext4_check_blocks_bitmap(struct super_block *);
1809 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1810                                                     ext4_group_t block_group,
1811                                                     struct buffer_head ** bh);
1812 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1813
1814 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1815                                                 ext4_group_t block_group);
1816 extern int ext4_wait_block_bitmap(struct super_block *sb,
1817                                   ext4_group_t block_group,
1818                                   struct buffer_head *bh);
1819 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1820                                                   ext4_group_t block_group);
1821 extern void ext4_init_block_bitmap(struct super_block *sb,
1822                                    struct buffer_head *bh,
1823                                    ext4_group_t group,
1824                                    struct ext4_group_desc *desc);
1825 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1826                                               ext4_group_t block_group,
1827                                               struct ext4_group_desc *gdp);
1828 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1829                                            ext4_group_t block_group,
1830                                            struct ext4_group_desc *gdp);
1831 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1832
1833 /* dir.c */
1834 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1835                                   struct file *,
1836                                   struct ext4_dir_entry_2 *,
1837                                   struct buffer_head *, unsigned int);
1838 #define ext4_check_dir_entry(dir, filp, de, bh, offset)                 \
1839         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1840                                         (de), (bh), (offset)))
1841 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1842                                     __u32 minor_hash,
1843                                     struct ext4_dir_entry_2 *dirent);
1844 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1845
1846 /* fsync.c */
1847 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1848 extern int ext4_flush_completed_IO(struct inode *);
1849
1850 /* hash.c */
1851 extern int ext4fs_dirhash(const char *name, int len, struct
1852                           dx_hash_info *hinfo);
1853
1854 /* ialloc.c */
1855 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
1856                                     const struct qstr *qstr, __u32 goal,
1857                                     uid_t *owner);
1858 extern void ext4_free_inode(handle_t *, struct inode *);
1859 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1860 extern unsigned long ext4_count_free_inodes(struct super_block *);
1861 extern unsigned long ext4_count_dirs(struct super_block *);
1862 extern void ext4_check_inodes_bitmap(struct super_block *);
1863 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1864 extern int ext4_init_inode_table(struct super_block *sb,
1865                                  ext4_group_t group, int barrier);
1866 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
1867
1868 /* mballoc.c */
1869 extern long ext4_mb_stats;
1870 extern long ext4_mb_max_to_scan;
1871 extern int ext4_mb_init(struct super_block *, int);
1872 extern int ext4_mb_release(struct super_block *);
1873 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1874                                 struct ext4_allocation_request *, int *);
1875 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1876 extern void ext4_discard_preallocations(struct inode *);
1877 extern int __init ext4_init_mballoc(void);
1878 extern void ext4_exit_mballoc(void);
1879 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1880                              struct buffer_head *bh, ext4_fsblk_t block,
1881                              unsigned long count, int flags);
1882 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1883                 ext4_group_t i, struct ext4_group_desc *desc);
1884 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1885                                 ext4_fsblk_t block, unsigned long count);
1886 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1887
1888 /* inode.c */
1889 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1890                                                 ext4_lblk_t, int, int *);
1891 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1892                                                 ext4_lblk_t, int, int *);
1893 int ext4_get_block(struct inode *inode, sector_t iblock,
1894                                 struct buffer_head *bh_result, int create);
1895
1896 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1897 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
1898 extern int  ext4_setattr(struct dentry *, struct iattr *);
1899 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1900                                 struct kstat *stat);
1901 extern void ext4_evict_inode(struct inode *);
1902 extern void ext4_clear_inode(struct inode *);
1903 extern int  ext4_sync_inode(handle_t *, struct inode *);
1904 extern void ext4_dirty_inode(struct inode *, int);
1905 extern int ext4_change_inode_journal_flag(struct inode *, int);
1906 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1907 extern int ext4_can_truncate(struct inode *inode);
1908 extern void ext4_truncate(struct inode *);
1909 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1910 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1911 extern void ext4_set_inode_flags(struct inode *);
1912 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1913 extern int ext4_alloc_da_blocks(struct inode *inode);
1914 extern void ext4_set_aops(struct inode *inode);
1915 extern int ext4_writepage_trans_blocks(struct inode *);
1916 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1917 extern int ext4_discard_partial_page_buffers(handle_t *handle,
1918                 struct address_space *mapping, loff_t from,
1919                 loff_t length, int flags);
1920 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1921 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1922 extern void ext4_da_update_reserve_space(struct inode *inode,
1923                                         int used, int quota_claim);
1924
1925 /* indirect.c */
1926 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1927                                 struct ext4_map_blocks *map, int flags);
1928 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1929                                 const struct iovec *iov, loff_t offset,
1930                                 unsigned long nr_segs);
1931 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1932 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
1933 extern void ext4_ind_truncate(struct inode *inode);
1934
1935 /* ioctl.c */
1936 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1937 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1938
1939 /* migrate.c */
1940 extern int ext4_ext_migrate(struct inode *);
1941
1942 /* namei.c */
1943 extern int ext4_orphan_add(handle_t *, struct inode *);
1944 extern int ext4_orphan_del(handle_t *, struct inode *);
1945 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1946                                 __u32 start_minor_hash, __u32 *next_hash);
1947
1948 /* resize.c */
1949 extern int ext4_group_add(struct super_block *sb,
1950                                 struct ext4_new_group_data *input);
1951 extern int ext4_group_extend(struct super_block *sb,
1952                                 struct ext4_super_block *es,
1953                                 ext4_fsblk_t n_blocks_count);
1954 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
1955
1956 /* super.c */
1957 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
1958 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
1959 extern void ext4_kvfree(void *ptr);
1960 extern __printf(4, 5)
1961 void __ext4_error(struct super_block *, const char *, unsigned int,
1962                   const char *, ...);
1963 #define ext4_error(sb, message...)      __ext4_error(sb, __func__,      \
1964                                                      __LINE__, ## message)
1965 extern __printf(5, 6)
1966 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
1967                       const char *, ...);
1968 extern __printf(5, 6)
1969 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
1970                      const char *, ...);
1971 extern void __ext4_std_error(struct super_block *, const char *,
1972                              unsigned int, int);
1973 extern __printf(4, 5)
1974 void __ext4_abort(struct super_block *, const char *, unsigned int,
1975                   const char *, ...);
1976 #define ext4_abort(sb, message...)      __ext4_abort(sb, __func__, \
1977                                                        __LINE__, ## message)
1978 extern __printf(4, 5)
1979 void __ext4_warning(struct super_block *, const char *, unsigned int,
1980                     const char *, ...);
1981 #define ext4_warning(sb, message...)    __ext4_warning(sb, __func__, \
1982                                                        __LINE__, ## message)
1983 extern __printf(3, 4)
1984 void ext4_msg(struct super_block *, const char *, const char *, ...);
1985 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1986                            const char *, unsigned int, const char *);
1987 #define dump_mmp_msg(sb, mmp, msg)      __dump_mmp_msg(sb, mmp, __func__, \
1988                                                        __LINE__, msg)
1989 extern __printf(7, 8)
1990 void __ext4_grp_locked_error(const char *, unsigned int,
1991                              struct super_block *, ext4_group_t,
1992                              unsigned long, ext4_fsblk_t,
1993                              const char *, ...);
1994 #define ext4_grp_locked_error(sb, grp, message...) \
1995         __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1996 extern void ext4_update_dynamic_rev(struct super_block *sb);
1997 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1998                                         __u32 compat);
1999 extern int ext4_update_rocompat_feature(handle_t *handle,
2000                                         struct super_block *sb, __u32 rocompat);
2001 extern int ext4_update_incompat_feature(handle_t *handle,
2002                                         struct super_block *sb, __u32 incompat);
2003 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2004                                       struct ext4_group_desc *bg);
2005 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2006                                       struct ext4_group_desc *bg);
2007 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2008                                      struct ext4_group_desc *bg);
2009 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2010                                       struct ext4_group_desc *bg);
2011 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2012                                  struct ext4_group_desc *bg);
2013 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2014                                 struct ext4_group_desc *bg);
2015 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2016                                    struct ext4_group_desc *bg);
2017 extern void ext4_block_bitmap_set(struct super_block *sb,
2018                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2019 extern void ext4_inode_bitmap_set(struct super_block *sb,
2020                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
2021 extern void ext4_inode_table_set(struct super_block *sb,
2022                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
2023 extern void ext4_free_group_clusters_set(struct super_block *sb,
2024                                          struct ext4_group_desc *bg,
2025                                          __u32 count);
2026 extern void ext4_free_inodes_set(struct super_block *sb,
2027                                 struct ext4_group_desc *bg, __u32 count);
2028 extern void ext4_used_dirs_set(struct super_block *sb,
2029                                 struct ext4_group_desc *bg, __u32 count);
2030 extern void ext4_itable_unused_set(struct super_block *sb,
2031                                    struct ext4_group_desc *bg, __u32 count);
2032 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
2033                                    struct ext4_group_desc *gdp);
2034 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
2035                                        struct ext4_group_desc *gdp);
2036
2037 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2038 {
2039         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2040                 le32_to_cpu(es->s_blocks_count_lo);
2041 }
2042
2043 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2044 {
2045         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2046                 le32_to_cpu(es->s_r_blocks_count_lo);
2047 }
2048
2049 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2050 {
2051         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2052                 le32_to_cpu(es->s_free_blocks_count_lo);
2053 }
2054
2055 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2056                                          ext4_fsblk_t blk)
2057 {
2058         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2059         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2060 }
2061
2062 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2063                                               ext4_fsblk_t blk)
2064 {
2065         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2066         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2067 }
2068
2069 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2070                                            ext4_fsblk_t blk)
2071 {
2072         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2073         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2074 }
2075
2076 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2077 {
2078         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2079                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2080                         le32_to_cpu(raw_inode->i_size_lo);
2081         else
2082                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2083 }
2084
2085 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2086 {
2087         raw_inode->i_size_lo = cpu_to_le32(i_size);
2088         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2089 }
2090
2091 static inline
2092 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2093                                             ext4_group_t group)
2094 {
2095          struct ext4_group_info ***grp_info;
2096          long indexv, indexh;
2097          grp_info = EXT4_SB(sb)->s_group_info;
2098          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2099          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2100          return grp_info[indexv][indexh];
2101 }
2102
2103 /*
2104  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2105  * the locking protocol documented in the comments of ext4_group_add()
2106  * in resize.c
2107  */
2108 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2109 {
2110         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2111
2112         smp_rmb();
2113         return ngroups;
2114 }
2115
2116 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2117                                              ext4_group_t block_group)
2118 {
2119         return block_group >> sbi->s_log_groups_per_flex;
2120 }
2121
2122 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2123 {
2124         return 1 << sbi->s_log_groups_per_flex;
2125 }
2126
2127 #define ext4_std_error(sb, errno)                               \
2128 do {                                                            \
2129         if ((errno))                                            \
2130                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2131 } while (0)
2132
2133 #ifdef CONFIG_SMP
2134 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2135  * counters. So we need to make sure we have free clusters more
2136  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2137  */
2138 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2139 #else
2140 #define EXT4_FREECLUSTERS_WATERMARK 0
2141 #endif
2142
2143 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2144 {
2145         /*
2146          * XXX: replace with spinlock if seen contended -bzzz
2147          */
2148         down_write(&EXT4_I(inode)->i_data_sem);
2149         if (newsize > EXT4_I(inode)->i_disksize)
2150                 EXT4_I(inode)->i_disksize = newsize;
2151         up_write(&EXT4_I(inode)->i_data_sem);
2152         return ;
2153 }
2154
2155 struct ext4_group_info {
2156         unsigned long   bb_state;
2157         struct rb_root  bb_free_root;
2158         ext4_grpblk_t   bb_first_free;  /* first free block */
2159         ext4_grpblk_t   bb_free;        /* total free blocks */
2160         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2161         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2162         struct          list_head bb_prealloc_list;
2163 #ifdef DOUBLE_CHECK
2164         void            *bb_bitmap;
2165 #endif
2166         struct rw_semaphore alloc_sem;
2167         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2168                                          * regions, index is order.
2169                                          * bb_counters[3] = 5 means
2170                                          * 5 free 8-block regions. */
2171 };
2172
2173 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
2174 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
2175
2176 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2177         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2178
2179 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
2180         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2181 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
2182         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2183 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
2184         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2185
2186 #define EXT4_MAX_CONTENTION             8
2187 #define EXT4_CONTENTION_THRESHOLD       2
2188
2189 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2190                                               ext4_group_t group)
2191 {
2192         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2193 }
2194
2195 /*
2196  * Returns true if the filesystem is busy enough that attempts to
2197  * access the block group locks has run into contention.
2198  */
2199 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2200 {
2201         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2202 }
2203
2204 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2205 {
2206         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2207         if (spin_trylock(lock))
2208                 /*
2209                  * We're able to grab the lock right away, so drop the
2210                  * lock contention counter.
2211                  */
2212                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2213         else {
2214                 /*
2215                  * The lock is busy, so bump the contention counter,
2216                  * and then wait on the spin lock.
2217                  */
2218                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2219                                   EXT4_MAX_CONTENTION);
2220                 spin_lock(lock);
2221         }
2222 }
2223
2224 static inline void ext4_unlock_group(struct super_block *sb,
2225                                         ext4_group_t group)
2226 {
2227         spin_unlock(ext4_group_lock_ptr(sb, group));
2228 }
2229
2230 static inline void ext4_mark_super_dirty(struct super_block *sb)
2231 {
2232         if (EXT4_SB(sb)->s_journal == NULL)
2233                 sb->s_dirt =1;
2234 }
2235
2236 /*
2237  * Block validity checking
2238  */
2239 #define ext4_check_indirect_blockref(inode, bh)                         \
2240         ext4_check_blockref(__func__, __LINE__, inode,                  \
2241                             (__le32 *)(bh)->b_data,                     \
2242                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2243
2244 #define ext4_ind_check_inode(inode)                                     \
2245         ext4_check_blockref(__func__, __LINE__, inode,                  \
2246                             EXT4_I(inode)->i_data,                      \
2247                             EXT4_NDIR_BLOCKS)
2248
2249 /*
2250  * Inodes and files operations
2251  */
2252
2253 /* dir.c */
2254 extern const struct file_operations ext4_dir_operations;
2255
2256 /* file.c */
2257 extern const struct inode_operations ext4_file_inode_operations;
2258 extern const struct file_operations ext4_file_operations;
2259 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2260
2261 /* namei.c */
2262 extern const struct inode_operations ext4_dir_inode_operations;
2263 extern const struct inode_operations ext4_special_inode_operations;
2264 extern struct dentry *ext4_get_parent(struct dentry *child);
2265
2266 /* symlink.c */
2267 extern const struct inode_operations ext4_symlink_inode_operations;
2268 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2269
2270 /* block_validity */
2271 extern void ext4_release_system_zone(struct super_block *sb);
2272 extern int ext4_setup_system_zone(struct super_block *sb);
2273 extern int __init ext4_init_system_zone(void);
2274 extern void ext4_exit_system_zone(void);
2275 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2276                                  ext4_fsblk_t start_blk,
2277                                  unsigned int count);
2278 extern int ext4_check_blockref(const char *, unsigned int,
2279                                struct inode *, __le32 *, unsigned int);
2280
2281 /* extents.c */
2282 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2283 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2284 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2285                                        int chunk);
2286 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2287                                struct ext4_map_blocks *map, int flags);
2288 extern void ext4_ext_truncate(struct inode *);
2289 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2290                                 loff_t length);
2291 extern void ext4_ext_init(struct super_block *);
2292 extern void ext4_ext_release(struct super_block *);
2293 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2294                           loff_t len);
2295 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2296                           ssize_t len);
2297 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2298                            struct ext4_map_blocks *map, int flags);
2299 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2300                         __u64 start, __u64 len);
2301 /* move_extent.c */
2302 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2303                              __u64 start_orig, __u64 start_donor,
2304                              __u64 len, __u64 *moved_len);
2305
2306 /* page-io.c */
2307 extern int __init ext4_init_pageio(void);
2308 extern void ext4_exit_pageio(void);
2309 extern void ext4_ioend_wait(struct inode *);
2310 extern void ext4_free_io_end(ext4_io_end_t *io);
2311 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2312 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2313 extern void ext4_io_submit(struct ext4_io_submit *io);
2314 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2315                                struct page *page,
2316                                int len,
2317                                struct writeback_control *wbc);
2318
2319 /* mmp.c */
2320 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2321
2322 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2323 enum ext4_state_bits {
2324         BH_Uninit       /* blocks are allocated but uninitialized on disk */
2325           = BH_JBDPrivateStart,
2326         BH_AllocFromCluster,    /* allocated blocks were part of already
2327                                  * allocated cluster. Note that this flag will
2328                                  * never, ever appear in a buffer_head's state
2329                                  * flag. See EXT4_MAP_FROM_CLUSTER to see where
2330                                  * this is used. */
2331         BH_Da_Mapped,   /* Delayed allocated block that now has a mapping. This
2332                          * flag is set when ext4_map_blocks is called on a
2333                          * delayed allocated block to get its real mapping. */
2334 };
2335
2336 BUFFER_FNS(Uninit, uninit)
2337 TAS_BUFFER_FNS(Uninit, uninit)
2338 BUFFER_FNS(Da_Mapped, da_mapped)
2339
2340 /*
2341  * Add new method to test wether block and inode bitmaps are properly
2342  * initialized. With uninit_bg reading the block from disk is not enough
2343  * to mark the bitmap uptodate. We need to also zero-out the bitmap
2344  */
2345 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2346
2347 static inline int bitmap_uptodate(struct buffer_head *bh)
2348 {
2349         return (buffer_uptodate(bh) &&
2350                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2351 }
2352 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2353 {
2354         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2355 }
2356
2357 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2358
2359 /* For ioend & aio unwritten conversion wait queues */
2360 #define EXT4_WQ_HASH_SZ         37
2361 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
2362                                             EXT4_WQ_HASH_SZ])
2363 #define ext4_aio_mutex(v)  (&ext4__aio_mutex[((unsigned long)(v)) %\
2364                                              EXT4_WQ_HASH_SZ])
2365 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2366 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2367
2368 #define EXT4_RESIZING   0
2369 extern int ext4_resize_begin(struct super_block *sb);
2370 extern void ext4_resize_end(struct super_block *sb);
2371
2372 #endif  /* __KERNEL__ */
2373
2374 #include "ext4_extents.h"
2375
2376 #endif  /* _EXT4_H */