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(f, a...)     do {} while (0)
  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 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 148                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
 149                                  EXT4_MAP_UNINIT)
 150
 151 struct ext4_map_blocks {
 152         ext4_fsblk_t m_pblk;
 153         ext4_lblk_t m_lblk;
 154         unsigned int m_len;
 155         unsigned int m_flags;
 156 };
 157
 158 /*
 159  * For delayed allocation tracking
 160  */
 161 struct mpage_da_data {
 162         struct inode *inode;
 163         sector_t b_blocknr;             /* start block number of extent */
 164         size_t b_size;                  /* size of extent */
 165         unsigned long b_state;          /* state of the extent */
 166         unsigned long first_page, next_page;    /* extent of pages */
 167         struct writeback_control *wbc;
 168         int io_done;
 169         int pages_written;
 170         int retval;
 171 };
 172
 173 /*
 174  * Flags for ext4_io_end->flags
 175  */
 176 #define EXT4_IO_END_UNWRITTEN   0x0001
 177 #define EXT4_IO_END_ERROR       0x0002
 178
 179 struct ext4_io_page {
 180         struct page     *p_page;
 181         atomic_t        p_count;
 182 };
 183
 184 #define MAX_IO_PAGES 128
 185
 186 typedef struct ext4_io_end {
 187         struct list_head        list;           /* per-file finished IO list */
 188         struct inode            *inode;         /* file being written to */
 189         unsigned int            flag;           /* unwritten or not */
 190         struct page             *page;          /* page struct for buffer write */
 191         loff_t                  offset;         /* offset in the file */
 192         ssize_t                 size;           /* size of the extent */
 193         struct work_struct      work;           /* data work queue */
 194         struct kiocb            *iocb;          /* iocb struct for AIO */
 195         int                     result;         /* error value for AIO */
 196         int                     num_io_pages;
 197         struct ext4_io_page     *pages[MAX_IO_PAGES];
 198 } ext4_io_end_t;
 199
 200 struct ext4_io_submit {
 201         int                     io_op;
 202         struct bio              *io_bio;
 203         ext4_io_end_t           *io_end;
 204         struct ext4_io_page     *io_page;
 205         sector_t                io_next_block;
 206 };
 207
 208 /*
 209  * Special inodes numbers
 210  */
 211 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 212 #define EXT4_ROOT_INO            2      /* Root inode */
 213 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 214 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 215 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 216 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 217 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 218 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 219
 220 /* First non-reserved inode for old ext4 filesystems */
 221 #define EXT4_GOOD_OLD_FIRST_INO 11
 222
 223 /*
 224  * Maximal count of links to a file
 225  */
 226 #define EXT4_LINK_MAX           65000
 227
 228 /*
 229  * Macro-instructions used to manage several block sizes
 230  */
 231 #define EXT4_MIN_BLOCK_SIZE             1024
 232 #define EXT4_MAX_BLOCK_SIZE             65536
 233 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 234 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 235 #ifdef __KERNEL__
 236 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 237 #else
 238 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 239 #endif
 240 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 241 #ifdef __KERNEL__
 242 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 243 #else
 244 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 245 #endif
 246 #ifdef __KERNEL__
 247 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 248 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 249 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 250 #else
 251 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 252                                  EXT4_GOOD_OLD_INODE_SIZE : \
 253                                  (s)->s_inode_size)
 254 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 255                                  EXT4_GOOD_OLD_FIRST_INO : \
 256                                  (s)->s_first_ino)
 257 #endif
 258 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 259
 260 /*
 261  * Structure of a blocks group descriptor
 262  */
 263 struct ext4_group_desc
 264 {
 265         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 266         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 267         __le32  bg_inode_table_lo;      /* Inodes table block */
 268         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 269         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 270         __le16  bg_used_dirs_count_lo;  /* Directories count */
 271         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 272         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 273         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 274         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 275         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 276         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 277         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 278         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 279         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 280         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 281         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 282         __u32   bg_reserved2[3];
 283 };
 284
 285 /*
 286  * Structure of a flex block group info
 287  */
 288
 289 struct flex_groups {
 290         atomic_t free_inodes;
 291         atomic_t free_blocks;
 292         atomic_t used_dirs;
 293 };
 294
 295 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 296 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 297 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 298
 299 /*
 300  * Macro-instructions used to manage group descriptors
 301  */
 302 #define EXT4_MIN_DESC_SIZE              32
 303 #define EXT4_MIN_DESC_SIZE_64BIT        64
 304 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 305 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 306 #ifdef __KERNEL__
 307 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 308 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 309 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 310 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 311 #else
 312 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 313 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 314 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 315 #endif
 316
 317 /*
 318  * Constants relative to the data blocks
 319  */
 320 #define EXT4_NDIR_BLOCKS                12
 321 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 322 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 323 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 324 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 325
 326 /*
 327  * Inode flags
 328  */
 329 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 330 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 331 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 332 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 333 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 334 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 335 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 336 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 337 /* Reserved for compression usage... */
 338 #define EXT4_DIRTY_FL                   0x00000100
 339 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 340 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 341 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 342 /* End compression flags --- maybe not all used */
 343 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 344 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 345 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 346 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 347 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 348 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 349 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 350 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 351 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 352 #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
 353 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 354
 355 #define EXT4_FL_USER_VISIBLE            0x004BDFFF /* User visible flags */
 356 #define EXT4_FL_USER_MODIFIABLE         0x004B80FF /* User modifiable flags */
 357
 358 /* Flags that should be inherited by new inodes from their parent. */
 359 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 360                            EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
 361                            EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 362                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 363                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
 364
 365 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 366 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 367
 368 /* Flags that are appropriate for non-directories/regular files. */
 369 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 370
 371 /* Mask out flags that are inappropriate for the given type of inode. */
 372 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 373 {
 374         if (S_ISDIR(mode))
 375                 return flags;
 376         else if (S_ISREG(mode))
 377                 return flags & EXT4_REG_FLMASK;
 378         else
 379                 return flags & EXT4_OTHER_FLMASK;
 380 }
 381
 382 /*
 383  * Inode flags used for atomic set/get
 384  */
 385 enum {
 386         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 387         EXT4_INODE_UNRM         = 1,    /* Undelete */
 388         EXT4_INODE_COMPR        = 2,    /* Compress file */
 389         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 390         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 391         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 392         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 393         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 394 /* Reserved for compression usage... */
 395         EXT4_INODE_DIRTY        = 8,
 396         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 397         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 398         EXT4_INODE_ECOMPR       = 11,   /* Compression error */
 399 /* End compression flags --- maybe not all used */
 400         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 401         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 402         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 403         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 404         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 405         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 406         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 407         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 408         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 409         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
 410         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 411 };
 412
 413 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 414 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
 415         printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
 416                 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
 417
 418 /*
 419  * Since it's pretty easy to mix up bit numbers and hex values, and we
 420  * can't do a compile-time test for ENUM values, we use a run-time
 421  * test to make sure that EXT4_XXX_FL is consistent with respect to
 422  * EXT4_INODE_XXX.  If all is well the printk and BUG_ON will all drop
 423  * out so it won't cost any extra space in the compiled kernel image.
 424  * But it's important that these values are the same, since we are
 425  * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
 426  * must be consistent with the values of FS_XXX_FL defined in
 427  * include/linux/fs.h and the on-disk values found in ext2, ext3, and
 428  * ext4 filesystems, and of course the values defined in e2fsprogs.
 429  *
 430  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 431  */
 432 static inline void ext4_check_flag_values(void)
 433 {
 434         CHECK_FLAG_VALUE(SECRM);
 435         CHECK_FLAG_VALUE(UNRM);
 436         CHECK_FLAG_VALUE(COMPR);
 437         CHECK_FLAG_VALUE(SYNC);
 438         CHECK_FLAG_VALUE(IMMUTABLE);
 439         CHECK_FLAG_VALUE(APPEND);
 440         CHECK_FLAG_VALUE(NODUMP);
 441         CHECK_FLAG_VALUE(NOATIME);
 442         CHECK_FLAG_VALUE(DIRTY);
 443         CHECK_FLAG_VALUE(COMPRBLK);
 444         CHECK_FLAG_VALUE(NOCOMPR);
 445         CHECK_FLAG_VALUE(ECOMPR);
 446         CHECK_FLAG_VALUE(INDEX);
 447         CHECK_FLAG_VALUE(IMAGIC);
 448         CHECK_FLAG_VALUE(JOURNAL_DATA);
 449         CHECK_FLAG_VALUE(NOTAIL);
 450         CHECK_FLAG_VALUE(DIRSYNC);
 451         CHECK_FLAG_VALUE(TOPDIR);
 452         CHECK_FLAG_VALUE(HUGE_FILE);
 453         CHECK_FLAG_VALUE(EXTENTS);
 454         CHECK_FLAG_VALUE(EA_INODE);
 455         CHECK_FLAG_VALUE(EOFBLOCKS);
 456         CHECK_FLAG_VALUE(RESERVED);
 457 }
 458
 459 /* Used to pass group descriptor data when online resize is done */
 460 struct ext4_new_group_input {
 461         __u32 group;            /* Group number for this data */
 462         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 463         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 464         __u64 inode_table;      /* Absolute block number of inode table start */
 465         __u32 blocks_count;     /* Total number of blocks in this group */
 466         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 467         __u16 unused;
 468 };
 469
 470 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 471 struct compat_ext4_new_group_input {
 472         u32 group;
 473         compat_u64 block_bitmap;
 474         compat_u64 inode_bitmap;
 475         compat_u64 inode_table;
 476         u32 blocks_count;
 477         u16 reserved_blocks;
 478         u16 unused;
 479 };
 480 #endif
 481
 482 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 483 struct ext4_new_group_data {
 484         __u32 group;
 485         __u64 block_bitmap;
 486         __u64 inode_bitmap;
 487         __u64 inode_table;
 488         __u32 blocks_count;
 489         __u16 reserved_blocks;
 490         __u16 unused;
 491         __u32 free_blocks_count;
 492 };
 493
 494 /*
 495  * Flags used by ext4_map_blocks()
 496  */
 497         /* Allocate any needed blocks and/or convert an unitialized
 498            extent to be an initialized ext4 */
 499 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 500         /* Request the creation of an unitialized extent */
 501 #define EXT4_GET_BLOCKS_UNINIT_EXT              0x0002
 502 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT       (EXT4_GET_BLOCKS_UNINIT_EXT|\
 503                                                  EXT4_GET_BLOCKS_CREATE)
 504         /* Caller is from the delayed allocation writeout path,
 505            so set the magic i_delalloc_reserve_flag after taking the
 506            inode allocation semaphore for */
 507 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 508         /* caller is from the direct IO path, request to creation of an
 509         unitialized extents if not allocated, split the uninitialized
 510         extent if blocks has been preallocated already*/
 511 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 512 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 513 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 514                                          EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
 515         /* Convert extent to initialized after IO complete */
 516 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 517                                          EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
 518         /* Punch out blocks of an extent */
 519 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT           0x0020
 520         /* Don't normalize allocation size (used for fallocate) */
 521 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 522
 523 /*
 524  * Flags used by ext4_free_blocks
 525  */
 526 #define EXT4_FREE_BLOCKS_METADATA       0x0001
 527 #define EXT4_FREE_BLOCKS_FORGET         0x0002
 528 #define EXT4_FREE_BLOCKS_VALIDATED      0x0004
 529
 530 /*
 531  * ioctl commands
 532  */
 533 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 534 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 535 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 536 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 537 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 538 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 539 #ifdef CONFIG_JBD2_DEBUG
 540 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 541 #endif
 542 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 543 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 544 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 545 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 546 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 547  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 548  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 549 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 550 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 551
 552 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 553 /*
 554  * ioctl commands in 32 bit emulation
 555  */
 556 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 557 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 558 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 559 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 560 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 561 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 562 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 563 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 564 #ifdef CONFIG_JBD2_DEBUG
 565 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 566 #endif
 567 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 568 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 569 #endif
 570
 571 /* Max physical block we can address w/o extents */
 572 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 573
 574 /*
 575  * Structure of an inode on the disk
 576  */
 577 struct ext4_inode {
 578         __le16  i_mode;         /* File mode */
 579         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 580         __le32  i_size_lo;      /* Size in bytes */
 581         __le32  i_atime;        /* Access time */
 582         __le32  i_ctime;        /* Inode Change time */
 583         __le32  i_mtime;        /* Modification time */
 584         __le32  i_dtime;        /* Deletion Time */
 585         __le16  i_gid;          /* Low 16 bits of Group Id */
 586         __le16  i_links_count;  /* Links count */
 587         __le32  i_blocks_lo;    /* Blocks count */
 588         __le32  i_flags;        /* File flags */
 589         union {
 590                 struct {
 591                         __le32  l_i_version;
 592                 } linux1;
 593                 struct {
 594                         __u32  h_i_translator;
 595                 } hurd1;
 596                 struct {
 597                         __u32  m_i_reserved1;
 598                 } masix1;
 599         } osd1;                         /* OS dependent 1 */
 600         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 601         __le32  i_generation;   /* File version (for NFS) */
 602         __le32  i_file_acl_lo;  /* File ACL */
 603         __le32  i_size_high;
 604         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 605         union {
 606                 struct {
 607                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 608                         __le16  l_i_file_acl_high;
 609                         __le16  l_i_uid_high;   /* these 2 fields */
 610                         __le16  l_i_gid_high;   /* were reserved2[0] */
 611                         __u32   l_i_reserved2;
 612                 } linux2;
 613                 struct {
 614                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 615                         __u16   h_i_mode_high;
 616                         __u16   h_i_uid_high;
 617                         __u16   h_i_gid_high;
 618                         __u32   h_i_author;
 619                 } hurd2;
 620                 struct {
 621                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 622                         __le16  m_i_file_acl_high;
 623                         __u32   m_i_reserved2[2];
 624                 } masix2;
 625         } osd2;                         /* OS dependent 2 */
 626         __le16  i_extra_isize;
 627         __le16  i_pad1;
 628         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 629         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 630         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 631         __le32  i_crtime;       /* File Creation time */
 632         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 633         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 634 };
 635
 636 struct move_extent {
 637         __u32 reserved;         /* should be zero */
 638         __u32 donor_fd;         /* donor file descriptor */
 639         __u64 orig_start;       /* logical start offset in block for orig */
 640         __u64 donor_start;      /* logical start offset in block for donor */
 641         __u64 len;              /* block length to be moved */
 642         __u64 moved_len;        /* moved block length */
 643 };
 644
 645 #define EXT4_EPOCH_BITS 2
 646 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 647 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 648
 649 /*
 650  * Extended fields will fit into an inode if the filesystem was formatted
 651  * with large inodes (-I 256 or larger) and there are not currently any EAs
 652  * consuming all of the available space. For new inodes we always reserve
 653  * enough space for the kernel's known extended fields, but for inodes
 654  * created with an old kernel this might not have been the case. None of
 655  * the extended inode fields is critical for correct filesystem operation.
 656  * This macro checks if a certain field fits in the inode. Note that
 657  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 658  */
 659 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 660         ((offsetof(typeof(*ext4_inode), field) +        \
 661           sizeof((ext4_inode)->field))                  \
 662         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 663             (einode)->i_extra_isize))                   \
 664
 665 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 666 {
 667        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 668                            (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
 669                           ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
 670 }
 671
 672 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 673 {
 674        if (sizeof(time->tv_sec) > 4)
 675                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 676                                << 32;
 677        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 678 }
 679
 680 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 681 do {                                                                           \
 682         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 683         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 684                 (raw_inode)->xtime ## _extra =                                 \
 685                                 ext4_encode_extra_time(&(inode)->xtime);       \
 686 } while (0)
 687
 688 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 689 do {                                                                           \
 690         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 691                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 692         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 693                 (raw_inode)->xtime ## _extra =                                 \
 694                                 ext4_encode_extra_time(&(einode)->xtime);      \
 695 } while (0)
 696
 697 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 698 do {                                                                           \
 699         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 700         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 701                 ext4_decode_extra_time(&(inode)->xtime,                        \
 702                                        raw_inode->xtime ## _extra);            \
 703         else                                                                   \
 704                 (inode)->xtime.tv_nsec = 0;                                    \
 705 } while (0)
 706
 707 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 708 do {                                                                           \
 709         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 710                 (einode)->xtime.tv_sec =                                       \
 711                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 712         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 713                 ext4_decode_extra_time(&(einode)->xtime,                       \
 714                                        raw_inode->xtime ## _extra);            \
 715         else                                                                   \
 716                 (einode)->xtime.tv_nsec = 0;                                   \
 717 } while (0)
 718
 719 #define i_disk_version osd1.linux1.l_i_version
 720
 721 #if defined(__KERNEL__) || defined(__linux__)
 722 #define i_reserved1     osd1.linux1.l_i_reserved1
 723 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 724 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 725 #define i_uid_low       i_uid
 726 #define i_gid_low       i_gid
 727 #define i_uid_high      osd2.linux2.l_i_uid_high
 728 #define i_gid_high      osd2.linux2.l_i_gid_high
 729 #define i_reserved2     osd2.linux2.l_i_reserved2
 730
 731 #elif defined(__GNU__)
 732
 733 #define i_translator    osd1.hurd1.h_i_translator
 734 #define i_uid_high      osd2.hurd2.h_i_uid_high
 735 #define i_gid_high      osd2.hurd2.h_i_gid_high
 736 #define i_author        osd2.hurd2.h_i_author
 737
 738 #elif defined(__masix__)
 739
 740 #define i_reserved1     osd1.masix1.m_i_reserved1
 741 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 742 #define i_reserved2     osd2.masix2.m_i_reserved2
 743
 744 #endif /* defined(__KERNEL__) || defined(__linux__) */
 745
 746 /*
 747  * storage for cached extent
 748  * If ec_len == 0, then the cache is invalid.
 749  * If ec_start == 0, then the cache represents a gap (null mapping)
 750  */
 751 struct ext4_ext_cache {
 752         ext4_fsblk_t    ec_start;
 753         ext4_lblk_t     ec_block;
 754         __u32           ec_len; /* must be 32bit to return holes */
 755 };
 756
 757 /*
 758  * fourth extended file system inode data in memory
 759  */
 760 struct ext4_inode_info {
 761         __le32  i_data[15];     /* unconverted */
 762         __u32   i_dtime;
 763         ext4_fsblk_t    i_file_acl;
 764
 765         /*
 766          * i_block_group is the number of the block group which contains
 767          * this file's inode.  Constant across the lifetime of the inode,
 768          * it is ued for making block allocation decisions - we try to
 769          * place a file's data blocks near its inode block, and new inodes
 770          * near to their parent directory's inode.
 771          */
 772         ext4_group_t    i_block_group;
 773         ext4_lblk_t     i_dir_start_lookup;
 774 #if (BITS_PER_LONG < 64)
 775         unsigned long   i_state_flags;          /* Dynamic state flags */
 776 #endif
 777         unsigned long   i_flags;
 778
 779 #ifdef CONFIG_EXT4_FS_XATTR
 780         /*
 781          * Extended attributes can be read independently of the main file
 782          * data. Taking i_mutex even when reading would cause contention
 783          * between readers of EAs and writers of regular file data, so
 784          * instead we synchronize on xattr_sem when reading or changing
 785          * EAs.
 786          */
 787         struct rw_semaphore xattr_sem;
 788 #endif
 789
 790         struct list_head i_orphan;      /* unlinked but open inodes */
 791
 792         /*
 793          * i_disksize keeps track of what the inode size is ON DISK, not
 794          * in memory.  During truncate, i_size is set to the new size by
 795          * the VFS prior to calling ext4_truncate(), but the filesystem won't
 796          * set i_disksize to 0 until the truncate is actually under way.
 797          *
 798          * The intent is that i_disksize always represents the blocks which
 799          * are used by this file.  This allows recovery to restart truncate
 800          * on orphans if we crash during truncate.  We actually write i_disksize
 801          * into the on-disk inode when writing inodes out, instead of i_size.
 802          *
 803          * The only time when i_disksize and i_size may be different is when
 804          * a truncate is in progress.  The only things which change i_disksize
 805          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
 806          */
 807         loff_t  i_disksize;
 808
 809         /*
 810          * i_data_sem is for serialising ext4_truncate() against
 811          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
 812          * data tree are chopped off during truncate. We can't do that in
 813          * ext4 because whenever we perform intermediate commits during
 814          * truncate, the inode and all the metadata blocks *must* be in a
 815          * consistent state which allows truncation of the orphans to restart
 816          * during recovery.  Hence we must fix the get_block-vs-truncate race
 817          * by other means, so we have i_data_sem.
 818          */
 819         struct rw_semaphore i_data_sem;
 820         struct inode vfs_inode;
 821         struct jbd2_inode *jinode;
 822
 823         struct ext4_ext_cache i_cached_extent;
 824         /*
 825          * File creation time. Its function is same as that of
 826          * struct timespec i_{a,c,m}time in the generic inode.
 827          */
 828         struct timespec i_crtime;
 829
 830         /* mballoc */
 831         struct list_head i_prealloc_list;
 832         spinlock_t i_prealloc_lock;
 833
 834         /* ialloc */
 835         ext4_group_t    i_last_alloc_group;
 836
 837         /* allocation reservation info for delalloc */
 838         unsigned int i_reserved_data_blocks;
 839         unsigned int i_reserved_meta_blocks;
 840         unsigned int i_allocated_meta_blocks;
 841         ext4_lblk_t i_da_metadata_calc_last_lblock;
 842         int i_da_metadata_calc_len;
 843
 844         /* on-disk additional length */
 845         __u16 i_extra_isize;
 846
 847 #ifdef CONFIG_QUOTA
 848         /* quota space reservation, managed internally by quota code */
 849         qsize_t i_reserved_quota;
 850 #endif
 851
 852         /* completed IOs that might need unwritten extents handling */
 853         struct list_head i_completed_io_list;
 854         spinlock_t i_completed_io_lock;
 855         atomic_t i_ioend_count; /* Number of outstanding io_end structs */
 856         /* current io_end structure for async DIO write*/
 857         ext4_io_end_t *cur_aio_dio;
 858         atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
 859
 860         spinlock_t i_block_reservation_lock;
 861
 862         /*
 863          * Transactions that contain inode's metadata needed to complete
 864          * fsync and fdatasync, respectively.
 865          */
 866         tid_t i_sync_tid;
 867         tid_t i_datasync_tid;
 868 };
 869
 870 /*
 871  * File system states
 872  */
 873 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 874 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 875 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 876
 877 /*
 878  * Misc. filesystem flags
 879  */
 880 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 881 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 882 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 883
 884 /*
 885  * Mount flags
 886  */
 887 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 888 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 889 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 890 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 891 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 892 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 893 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 894 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 895 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 896 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 897 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 898 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 899 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 900 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 901 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 902 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 903 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
 904 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 905 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 906 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 907 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 908 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
 909 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 910 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 911 #define EXT4_MOUNT_I_VERSION            0x2000000 /* i_version support */
 912 #define EXT4_MOUNT_MBLK_IO_SUBMIT       0x4000000 /* multi-block io submits */
 913 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
 914 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
 915 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
 916 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
 917 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
 918
 919 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
 920                                                 ~EXT4_MOUNT_##opt
 921 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
 922                                                 EXT4_MOUNT_##opt
 923 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 924                                          EXT4_MOUNT_##opt)
 925
 926 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
 927                                                 ~EXT4_MOUNT2_##opt
 928 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
 929                                                 EXT4_MOUNT2_##opt
 930 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
 931                                          EXT4_MOUNT2_##opt)
 932
 933 #define ext4_set_bit                    __test_and_set_bit_le
 934 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 935 #define ext4_clear_bit                  __test_and_clear_bit_le
 936 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 937 #define ext4_test_bit                   test_bit_le
 938 #define ext4_find_first_zero_bit        find_first_zero_bit_le
 939 #define ext4_find_next_zero_bit         find_next_zero_bit_le
 940 #define ext4_find_next_bit              find_next_bit_le
 941
 942 /*
 943  * Maximal mount counts between two filesystem checks
 944  */
 945 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 946 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 947
 948 /*
 949  * Behaviour when detecting errors
 950  */
 951 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 952 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 953 #define EXT4_ERRORS_PANIC               3       /* Panic */
 954 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 955
 956 /*
 957  * Structure of the super block
 958  */
 959 struct ext4_super_block {
 960 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 961         __le32  s_blocks_count_lo;      /* Blocks count */
 962         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 963         __le32  s_free_blocks_count_lo; /* Free blocks count */
 964 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 965         __le32  s_first_data_block;     /* First Data Block */
 966         __le32  s_log_block_size;       /* Block size */
 967         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 968 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 969         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 970         __le32  s_inodes_per_group;     /* # Inodes per group */
 971         __le32  s_mtime;                /* Mount time */
 972 /*30*/  __le32  s_wtime;                /* Write time */
 973         __le16  s_mnt_count;            /* Mount count */
 974         __le16  s_max_mnt_count;        /* Maximal mount count */
 975         __le16  s_magic;                /* Magic signature */
 976         __le16  s_state;                /* File system state */
 977         __le16  s_errors;               /* Behaviour when detecting errors */
 978         __le16  s_minor_rev_level;      /* minor revision level */
 979 /*40*/  __le32  s_lastcheck;            /* time of last check */
 980         __le32  s_checkinterval;        /* max. time between checks */
 981         __le32  s_creator_os;           /* OS */
 982         __le32  s_rev_level;            /* Revision level */
 983 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 984         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 985         /*
 986          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 987          *
 988          * Note: the difference between the compatible feature set and
 989          * the incompatible feature set is that if there is a bit set
 990          * in the incompatible feature set that the kernel doesn't
 991          * know about, it should refuse to mount the filesystem.
 992          *
 993          * e2fsck's requirements are more strict; if it doesn't know
 994          * about a feature in either the compatible or incompatible
 995          * feature set, it must abort and not try to meddle with
 996          * things it doesn't understand...
 997          */
 998         __le32  s_first_ino;            /* First non-reserved inode */
 999         __le16  s_inode_size;           /* size of inode structure */
1000         __le16  s_block_group_nr;       /* block group # of this superblock */
1001         __le32  s_feature_compat;       /* compatible feature set */
1002 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1003         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1004 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1005 /*78*/  char    s_volume_name[16];      /* volume name */
1006 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
1007 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1008         /*
1009          * Performance hints.  Directory preallocation should only
1010          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1011          */
1012         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1013         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1014         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1015         /*
1016          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1017          */
1018 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1019 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1020         __le32  s_journal_dev;          /* device number of journal file */
1021         __le32  s_last_orphan;          /* start of list of inodes to delete */
1022         __le32  s_hash_seed[4];         /* HTREE hash seed */
1023         __u8    s_def_hash_version;     /* Default hash version to use */
1024         __u8    s_jnl_backup_type;
1025         __le16  s_desc_size;            /* size of group descriptor */
1026 /*100*/ __le32  s_default_mount_opts;
1027         __le32  s_first_meta_bg;        /* First metablock block group */
1028         __le32  s_mkfs_time;            /* When the filesystem was created */
1029         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1030         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1031 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1032         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1033         __le32  s_free_blocks_count_hi; /* Free blocks count */
1034         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1035         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1036         __le32  s_flags;                /* Miscellaneous flags */
1037         __le16  s_raid_stride;          /* RAID stride */
1038         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1039         __le64  s_mmp_block;            /* Block for multi-mount protection */
1040         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1041         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1042         __u8    s_reserved_char_pad;
1043         __le16  s_reserved_pad;
1044         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1045         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1046         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1047         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1048                                               snapshot's future use */
1049         __le32  s_snapshot_list;        /* inode number of the head of the
1050                                            on-disk snapshot list */
1051 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1052         __le32  s_error_count;          /* number of fs errors */
1053         __le32  s_first_error_time;     /* first time an error happened */
1054         __le32  s_first_error_ino;      /* inode involved in first error */
1055         __le64  s_first_error_block;    /* block involved of first error */
1056         __u8    s_first_error_func[32]; /* function where the error happened */
1057         __le32  s_first_error_line;     /* line number where error happened */
1058         __le32  s_last_error_time;      /* most recent time of an error */
1059         __le32  s_last_error_ino;       /* inode involved in last error */
1060         __le32  s_last_error_line;      /* line number where error happened */
1061         __le64  s_last_error_block;     /* block involved of last error */
1062         __u8    s_last_error_func[32];  /* function where the error happened */
1063 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1064         __u8    s_mount_opts[64];
1065         __le32  s_reserved[112];        /* Padding to the end of the block */
1066 };
1067
1068 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1069
1070 #ifdef __KERNEL__
1071
1072 /*
1073  * run-time mount flags
1074  */
1075 #define EXT4_MF_MNTDIR_SAMPLED  0x0001
1076 #define EXT4_MF_FS_ABORTED      0x0002  /* Fatal error detected */
1077
1078 /*
1079  * fourth extended-fs super-block data in memory
1080  */
1081 struct ext4_sb_info {
1082         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1083         unsigned long s_inodes_per_block;/* Number of inodes per block */
1084         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1085         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1086         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1087         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1088         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1089         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1090         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1091         unsigned long s_overhead_last;  /* Last calculated overhead */
1092         unsigned long s_blocks_last;    /* Last seen block count */
1093         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1094         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1095         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1096         struct buffer_head **s_group_desc;
1097         unsigned int s_mount_opt;
1098         unsigned int s_mount_opt2;
1099         unsigned int s_mount_flags;
1100         ext4_fsblk_t s_sb_block;
1101         uid_t s_resuid;
1102         gid_t s_resgid;
1103         unsigned short s_mount_state;
1104         unsigned short s_pad;
1105         int s_addr_per_block_bits;
1106         int s_desc_per_block_bits;
1107         int s_inode_size;
1108         int s_first_ino;
1109         unsigned int s_inode_readahead_blks;
1110         unsigned int s_inode_goal;
1111         spinlock_t s_next_gen_lock;
1112         u32 s_next_generation;
1113         u32 s_hash_seed[4];
1114         int s_def_hash_version;
1115         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
1116         struct percpu_counter s_freeblocks_counter;
1117         struct percpu_counter s_freeinodes_counter;
1118         struct percpu_counter s_dirs_counter;
1119         struct percpu_counter s_dirtyblocks_counter;
1120         struct blockgroup_lock *s_blockgroup_lock;
1121         struct proc_dir_entry *s_proc;
1122         struct kobject s_kobj;
1123         struct completion s_kobj_unregister;
1124
1125         /* Journaling */
1126         struct journal_s *s_journal;
1127         struct list_head s_orphan;
1128         struct mutex s_orphan_lock;
1129         struct mutex s_resize_lock;
1130         unsigned long s_commit_interval;
1131         u32 s_max_batch_time;
1132         u32 s_min_batch_time;
1133         struct block_device *journal_bdev;
1134 #ifdef CONFIG_JBD2_DEBUG
1135         struct timer_list turn_ro_timer;        /* For turning read-only (crash simulation) */
1136         wait_queue_head_t ro_wait_queue;        /* For people waiting for the fs to go read-only */
1137 #endif
1138 #ifdef CONFIG_QUOTA
1139         char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */
1140         int s_jquota_fmt;                       /* Format of quota to use */
1141 #endif
1142         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1143         struct rb_root system_blks;
1144
1145 #ifdef EXTENTS_STATS
1146         /* ext4 extents stats */
1147         unsigned long s_ext_min;
1148         unsigned long s_ext_max;
1149         unsigned long s_depth_max;
1150         spinlock_t s_ext_stats_lock;
1151         unsigned long s_ext_blocks;
1152         unsigned long s_ext_extents;
1153 #endif
1154         /* ext4 extent cache stats */
1155         unsigned long extent_cache_hits;
1156         unsigned long extent_cache_misses;
1157
1158         /* for buddy allocator */
1159         struct ext4_group_info ***s_group_info;
1160         struct inode *s_buddy_cache;
1161         spinlock_t s_md_lock;
1162         unsigned short *s_mb_offsets;
1163         unsigned int *s_mb_maxs;
1164
1165         /* tunables */
1166         unsigned long s_stripe;
1167         unsigned int s_mb_stream_request;
1168         unsigned int s_mb_max_to_scan;
1169         unsigned int s_mb_min_to_scan;
1170         unsigned int s_mb_stats;
1171         unsigned int s_mb_order2_reqs;
1172         unsigned int s_mb_group_prealloc;
1173         unsigned int s_max_writeback_mb_bump;
1174         /* where last allocation was done - for stream allocation */
1175         unsigned long s_mb_last_group;
1176         unsigned long s_mb_last_start;
1177
1178         /* stats for buddy allocator */
1179         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1180         atomic_t s_bal_success; /* we found long enough chunks */
1181         atomic_t s_bal_allocated;       /* in blocks */
1182         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1183         atomic_t s_bal_goals;   /* goal hits */
1184         atomic_t s_bal_breaks;  /* too long searches */
1185         atomic_t s_bal_2orders; /* 2^order hits */
1186         spinlock_t s_bal_lock;
1187         unsigned long s_mb_buddies_generated;
1188         unsigned long long s_mb_generation_time;
1189         atomic_t s_mb_lost_chunks;
1190         atomic_t s_mb_preallocated;
1191         atomic_t s_mb_discarded;
1192         atomic_t s_lock_busy;
1193
1194         /* locality groups */
1195         struct ext4_locality_group __percpu *s_locality_groups;
1196
1197         /* for write statistics */
1198         unsigned long s_sectors_written_start;
1199         u64 s_kbytes_written;
1200
1201         unsigned int s_log_groups_per_flex;
1202         struct flex_groups *s_flex_groups;
1203
1204         /* workqueue for dio unwritten */
1205         struct workqueue_struct *dio_unwritten_wq;
1206
1207         /* timer for periodic error stats printing */
1208         struct timer_list s_err_report;
1209
1210         /* Lazy inode table initialization info */
1211         struct ext4_li_request *s_li_request;
1212         /* Wait multiplier for lazy initialization thread */
1213         unsigned int s_li_wait_mult;
1214
1215         /* Kernel thread for multiple mount protection */
1216         struct task_struct *s_mmp_tsk;
1217 };
1218
1219 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1220 {
1221         return sb->s_fs_info;
1222 }
1223 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1224 {
1225         return container_of(inode, struct ext4_inode_info, vfs_inode);
1226 }
1227
1228 static inline struct timespec ext4_current_time(struct inode *inode)
1229 {
1230         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1231                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1232 }
1233
1234 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1235 {
1236         return ino == EXT4_ROOT_INO ||
1237                 ino == EXT4_JOURNAL_INO ||
1238                 ino == EXT4_RESIZE_INO ||
1239                 (ino >= EXT4_FIRST_INO(sb) &&
1240                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1241 }
1242
1243 /*
1244  * Inode dynamic state flags
1245  */
1246 enum {
1247         EXT4_STATE_JDATA,               /* journaled data exists */
1248         EXT4_STATE_NEW,                 /* inode is newly created */
1249         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1250         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1251         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1252         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1253         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
1254         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1255         EXT4_STATE_DELALLOC_RESERVED,   /* blks already reserved for delalloc */
1256 };
1257
1258 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1259 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1260 {                                                                       \
1261         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1262 }                                                                       \
1263 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1264 {                                                                       \
1265         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1266 }                                                                       \
1267 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1268 {                                                                       \
1269         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1270 }
1271
1272 EXT4_INODE_BIT_FNS(flag, flags, 0)
1273 #if (BITS_PER_LONG < 64)
1274 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1275
1276 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1277 {
1278         (ei)->i_state_flags = 0;
1279 }
1280 #else
1281 EXT4_INODE_BIT_FNS(state, flags, 32)
1282
1283 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1284 {
1285         /* We depend on the fact that callers will set i_flags */
1286 }
1287 #endif
1288 #else
1289 /* Assume that user mode programs are passing in an ext4fs superblock, not
1290  * a kernel struct super_block.  This will allow us to call the feature-test
1291  * macros from user land. */
1292 #define EXT4_SB(sb)     (sb)
1293 #endif
1294
1295 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1296
1297 /*
1298  * Codes for operating systems
1299  */
1300 #define EXT4_OS_LINUX           0
1301 #define EXT4_OS_HURD            1
1302 #define EXT4_OS_MASIX           2
1303 #define EXT4_OS_FREEBSD         3
1304 #define EXT4_OS_LITES           4
1305
1306 /*
1307  * Revision levels
1308  */
1309 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1310 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1311
1312 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
1313 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1314
1315 #define EXT4_GOOD_OLD_INODE_SIZE 128
1316
1317 /*
1318  * Feature set definitions
1319  */
1320
1321 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
1322         ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1323 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
1324         ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1325 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
1326         ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1327 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
1328         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1329 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
1330         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1331 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
1332         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1333 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
1334         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1335 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
1336         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1337 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
1338         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1339
1340 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1341 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1342 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1343 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1344 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1345 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1346
1347 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1348 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1349 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
1350 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
1351 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
1352 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
1353 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
1354 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
1355
1356 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
1357 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
1358 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
1359 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
1360 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
1361 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
1362 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
1363 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
1364 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
1365 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
1366 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
1367
1368 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1369 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1370                                          EXT4_FEATURE_INCOMPAT_META_BG)
1371 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1372                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1373                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1374
1375 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
1376 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1377                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1378                                          EXT4_FEATURE_INCOMPAT_META_BG)
1379 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1380                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1381                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1382
1383 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
1384 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1385                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
1386                                          EXT4_FEATURE_INCOMPAT_META_BG| \
1387                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
1388                                          EXT4_FEATURE_INCOMPAT_64BIT| \
1389                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1390                                          EXT4_FEATURE_INCOMPAT_MMP)
1391 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1392                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1393                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1394                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1395                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1396                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1397                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1398
1399 /*
1400  * Default values for user and/or group using reserved blocks
1401  */
1402 #define EXT4_DEF_RESUID         0
1403 #define EXT4_DEF_RESGID         0
1404
1405 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
1406
1407 /*
1408  * Default mount options
1409  */
1410 #define EXT4_DEFM_DEBUG         0x0001
1411 #define EXT4_DEFM_BSDGROUPS     0x0002
1412 #define EXT4_DEFM_XATTR_USER    0x0004
1413 #define EXT4_DEFM_ACL           0x0008
1414 #define EXT4_DEFM_UID16         0x0010
1415 #define EXT4_DEFM_JMODE         0x0060
1416 #define EXT4_DEFM_JMODE_DATA    0x0020
1417 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1418 #define EXT4_DEFM_JMODE_WBACK   0x0060
1419 #define EXT4_DEFM_NOBARRIER     0x0100
1420 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1421 #define EXT4_DEFM_DISCARD       0x0400
1422 #define EXT4_DEFM_NODELALLOC    0x0800
1423
1424 /*
1425  * Default journal batch times
1426  */
1427 #define EXT4_DEF_MIN_BATCH_TIME 0
1428 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1429
1430 /*
1431  * Minimum number of groups in a flexgroup before we separate out
1432  * directories into the first block group of a flexgroup
1433  */
1434 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1435
1436 /*
1437  * Structure of a directory entry
1438  */
1439 #define EXT4_NAME_LEN 255
1440
1441 struct ext4_dir_entry {
1442         __le32  inode;                  /* Inode number */
1443         __le16  rec_len;                /* Directory entry length */
1444         __le16  name_len;               /* Name length */
1445         char    name[EXT4_NAME_LEN];    /* File name */
1446 };
1447
1448 /*
1449  * The new version of the directory entry.  Since EXT4 structures are
1450  * stored in intel byte order, and the name_len field could never be
1451  * bigger than 255 chars, it's safe to reclaim the extra byte for the
1452  * file_type field.
1453  */
1454 struct ext4_dir_entry_2 {
1455         __le32  inode;                  /* Inode number */
1456         __le16  rec_len;                /* Directory entry length */
1457         __u8    name_len;               /* Name length */
1458         __u8    file_type;
1459         char    name[EXT4_NAME_LEN];    /* File name */
1460 };
1461
1462 /*
1463  * Ext4 directory file types.  Only the low 3 bits are used.  The
1464  * other bits are reserved for now.
1465  */
1466 #define EXT4_FT_UNKNOWN         0
1467 #define EXT4_FT_REG_FILE        1
1468 #define EXT4_FT_DIR             2
1469 #define EXT4_FT_CHRDEV          3
1470 #define EXT4_FT_BLKDEV          4
1471 #define EXT4_FT_FIFO            5
1472 #define EXT4_FT_SOCK            6
1473 #define EXT4_FT_SYMLINK         7
1474
1475 #define EXT4_FT_MAX             8
1476
1477 /*
1478  * EXT4_DIR_PAD defines the directory entries boundaries
1479  *
1480  * NOTE: It must be a multiple of 4
1481  */
1482 #define EXT4_DIR_PAD                    4
1483 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
1484 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
1485                                          ~EXT4_DIR_ROUND)
1486 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
1487
1488 /*
1489  * If we ever get support for fs block sizes > page_size, we'll need
1490  * to remove the #if statements in the next two functions...
1491  */
1492 static inline unsigned int
1493 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1494 {
1495         unsigned len = le16_to_cpu(dlen);
1496
1497 #if (PAGE_CACHE_SIZE >= 65536)
1498         if (len == EXT4_MAX_REC_LEN || len == 0)
1499                 return blocksize;
1500         return (len & 65532) | ((len & 3) << 16);
1501 #else
1502         return len;
1503 #endif
1504 }
1505
1506 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1507 {
1508         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1509                 BUG();
1510 #if (PAGE_CACHE_SIZE >= 65536)
1511         if (len < 65536)
1512                 return cpu_to_le16(len);
1513         if (len == blocksize) {
1514                 if (blocksize == 65536)
1515                         return cpu_to_le16(EXT4_MAX_REC_LEN);
1516                 else
1517                         return cpu_to_le16(0);
1518         }
1519         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1520 #else
1521         return cpu_to_le16(len);
1522 #endif
1523 }
1524
1525 /*
1526  * Hash Tree Directory indexing
1527  * (c) Daniel Phillips, 2001
1528  */
1529
1530 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1531                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1532                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1533 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1534 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1535
1536 /* Legal values for the dx_root hash_version field: */
1537
1538 #define DX_HASH_LEGACY          0
1539 #define DX_HASH_HALF_MD4        1
1540 #define DX_HASH_TEA             2
1541 #define DX_HASH_LEGACY_UNSIGNED 3
1542 #define DX_HASH_HALF_MD4_UNSIGNED       4
1543 #define DX_HASH_TEA_UNSIGNED            5
1544
1545 #ifdef __KERNEL__
1546
1547 /* hash info structure used by the directory hash */
1548 struct dx_hash_info
1549 {
1550         u32             hash;
1551         u32             minor_hash;
1552         int             hash_version;
1553         u32             *seed;
1554 };
1555
1556 #define EXT4_HTREE_EOF  0x7fffffff
1557
1558 /*
1559  * Control parameters used by ext4_htree_next_block
1560  */
1561 #define HASH_NB_ALWAYS          1
1562
1563
1564 /*
1565  * Describe an inode's exact location on disk and in memory
1566  */
1567 struct ext4_iloc
1568 {
1569         struct buffer_head *bh;
1570         unsigned long offset;
1571         ext4_group_t block_group;
1572 };
1573
1574 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1575 {
1576         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1577 }
1578
1579 /*
1580  * This structure is stuffed into the struct file's private_data field
1581  * for directories.  It is where we put information so that we can do
1582  * readdir operations in hash tree order.
1583  */
1584 struct dir_private_info {
1585         struct rb_root  root;
1586         struct rb_node  *curr_node;
1587         struct fname    *extra_fname;
1588         loff_t          last_pos;
1589         __u32           curr_hash;
1590         __u32           curr_minor_hash;
1591         __u32           next_hash;
1592 };
1593
1594 /* calculate the first block number of the group */
1595 static inline ext4_fsblk_t
1596 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1597 {
1598         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1599                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1600 }
1601
1602 /*
1603  * Special error return code only used by dx_probe() and its callers.
1604  */
1605 #define ERR_BAD_DX_DIR  -75000
1606
1607 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1608                         ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1609
1610 /*
1611  * Timeout and state flag for lazy initialization inode thread.
1612  */
1613 #define EXT4_DEF_LI_WAIT_MULT                   10
1614 #define EXT4_DEF_LI_MAX_START_DELAY             5
1615 #define EXT4_LAZYINIT_QUIT                      0x0001
1616 #define EXT4_LAZYINIT_RUNNING                   0x0002
1617
1618 /*
1619  * Lazy inode table initialization info
1620  */
1621 struct ext4_lazy_init {
1622         unsigned long           li_state;
1623         struct list_head        li_request_list;
1624         struct mutex            li_list_mtx;
1625 };
1626
1627 struct ext4_li_request {
1628         struct super_block      *lr_super;
1629         struct ext4_sb_info     *lr_sbi;
1630         ext4_group_t            lr_next_group;
1631         struct list_head        lr_request;
1632         unsigned long           lr_next_sched;
1633         unsigned long           lr_timeout;
1634 };
1635
1636 struct ext4_features {
1637         struct kobject f_kobj;
1638         struct completion f_kobj_unregister;
1639 };
1640
1641 /*
1642  * This structure will be used for multiple mount protection. It will be
1643  * written into the block number saved in the s_mmp_block field in the
1644  * superblock. Programs that check MMP should assume that if
1645  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1646  * to use the filesystem, regardless of how old the timestamp is.
1647  */
1648 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
1649 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1650 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
1651 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
1652
1653 struct mmp_struct {
1654         __le32  mmp_magic;              /* Magic number for MMP */
1655         __le32  mmp_seq;                /* Sequence no. updated periodically */
1656
1657         /*
1658          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1659          * purposes and do not affect the correctness of the algorithm
1660          */
1661         __le64  mmp_time;               /* Time last updated */
1662         char    mmp_nodename[64];       /* Node which last updated MMP block */
1663         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
1664
1665         /*
1666          * mmp_check_interval is used to verify if the MMP block has been
1667          * updated on the block device. The value is updated based on the
1668          * maximum time to write the MMP block during an update cycle.
1669          */
1670         __le16  mmp_check_interval;
1671
1672         __le16  mmp_pad1;
1673         __le32  mmp_pad2[227];
1674 };
1675
1676 /* arguments passed to the mmp thread */
1677 struct mmpd_data {
1678         struct buffer_head *bh; /* bh from initial read_mmp_block() */
1679         struct super_block *sb;  /* super block of the fs */
1680 };
1681
1682 /*
1683  * Check interval multiplier
1684  * The MMP block is written every update interval and initially checked every
1685  * update interval x the multiplier (the value is then adapted based on the
1686  * write latency). The reason is that writes can be delayed under load and we
1687  * don't want readers to incorrectly assume that the filesystem is no longer
1688  * in use.
1689  */
1690 #define EXT4_MMP_CHECK_MULT             2UL
1691
1692 /*
1693  * Minimum interval for MMP checking in seconds.
1694  */
1695 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
1696
1697 /*
1698  * Maximum interval for MMP checking in seconds.
1699  */
1700 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
1701
1702 /*
1703  * Function prototypes
1704  */
1705
1706 /*
1707  * Ok, these declarations are also in <linux/kernel.h> but none of the
1708  * ext4 source programs needs to include it so they are duplicated here.
1709  */
1710 # define NORET_TYPE     /**/
1711 # define ATTRIB_NORET   __attribute__((noreturn))
1712 # define NORET_AND      noreturn,
1713
1714 /* bitmap.c */
1715 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1716
1717 /* balloc.c */
1718 extern unsigned int ext4_block_group(struct super_block *sb,
1719                         ext4_fsblk_t blocknr);
1720 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1721                         ext4_fsblk_t blocknr);
1722 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1723 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1724                         ext4_group_t group);
1725 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1726                                          ext4_fsblk_t goal,
1727                                          unsigned int flags,
1728                                          unsigned long *count,
1729                                          int *errp);
1730 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
1731                                   s64 nblocks, unsigned int flags);
1732 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1733 extern void ext4_check_blocks_bitmap(struct super_block *);
1734 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1735                                                     ext4_group_t block_group,
1736                                                     struct buffer_head ** bh);
1737 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1738 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1739                                       ext4_group_t block_group);
1740 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1741                                        struct buffer_head *bh,
1742                                        ext4_group_t group,
1743                                        struct ext4_group_desc *desc);
1744 #define ext4_free_blocks_after_init(sb, group, desc)                    \
1745                 ext4_init_block_bitmap(sb, NULL, group, desc)
1746
1747 /* dir.c */
1748 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1749                                   struct file *,
1750                                   struct ext4_dir_entry_2 *,
1751                                   struct buffer_head *, unsigned int);
1752 #define ext4_check_dir_entry(dir, filp, de, bh, offset)                 \
1753         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1754                                         (de), (bh), (offset)))
1755 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1756                                     __u32 minor_hash,
1757                                     struct ext4_dir_entry_2 *dirent);
1758 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1759
1760 /* fsync.c */
1761 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1762 extern int ext4_flush_completed_IO(struct inode *);
1763
1764 /* hash.c */
1765 extern int ext4fs_dirhash(const char *name, int len, struct
1766                           dx_hash_info *hinfo);
1767
1768 /* ialloc.c */
1769 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1770                                     const struct qstr *qstr, __u32 goal);
1771 extern void ext4_free_inode(handle_t *, struct inode *);
1772 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1773 extern unsigned long ext4_count_free_inodes(struct super_block *);
1774 extern unsigned long ext4_count_dirs(struct super_block *);
1775 extern void ext4_check_inodes_bitmap(struct super_block *);
1776 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1777 extern int ext4_init_inode_table(struct super_block *sb,
1778                                  ext4_group_t group, int barrier);
1779
1780 /* mballoc.c */
1781 extern long ext4_mb_stats;
1782 extern long ext4_mb_max_to_scan;
1783 extern int ext4_mb_init(struct super_block *, int);
1784 extern int ext4_mb_release(struct super_block *);
1785 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1786                                 struct ext4_allocation_request *, int *);
1787 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1788 extern void ext4_discard_preallocations(struct inode *);
1789 extern int __init ext4_init_mballoc(void);
1790 extern void ext4_exit_mballoc(void);
1791 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1792                              struct buffer_head *bh, ext4_fsblk_t block,
1793                              unsigned long count, int flags);
1794 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1795                 ext4_group_t i, struct ext4_group_desc *desc);
1796 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1797                                 ext4_fsblk_t block, unsigned long count);
1798 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1799
1800 /* inode.c */
1801 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1802                                                 ext4_lblk_t, int, int *);
1803 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1804                                                 ext4_lblk_t, int, int *);
1805 int ext4_get_block(struct inode *inode, sector_t iblock,
1806                                 struct buffer_head *bh_result, int create);
1807
1808 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1809 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
1810 extern int  ext4_setattr(struct dentry *, struct iattr *);
1811 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1812                                 struct kstat *stat);
1813 extern void ext4_evict_inode(struct inode *);
1814 extern void ext4_clear_inode(struct inode *);
1815 extern int  ext4_sync_inode(handle_t *, struct inode *);
1816 extern void ext4_dirty_inode(struct inode *, int);
1817 extern int ext4_change_inode_journal_flag(struct inode *, int);
1818 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1819 extern int ext4_can_truncate(struct inode *inode);
1820 extern void ext4_truncate(struct inode *);
1821 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1822 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1823 extern void ext4_set_inode_flags(struct inode *);
1824 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1825 extern int ext4_alloc_da_blocks(struct inode *inode);
1826 extern void ext4_set_aops(struct inode *inode);
1827 extern int ext4_writepage_trans_blocks(struct inode *);
1828 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1829 extern int ext4_block_truncate_page(handle_t *handle,
1830                 struct address_space *mapping, loff_t from);
1831 extern int ext4_block_zero_page_range(handle_t *handle,
1832                 struct address_space *mapping, loff_t from, loff_t length);
1833 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1834 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1835 extern void ext4_da_update_reserve_space(struct inode *inode,
1836                                         int used, int quota_claim);
1837 /* ioctl.c */
1838 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1839 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1840
1841 /* migrate.c */
1842 extern int ext4_ext_migrate(struct inode *);
1843
1844 /* namei.c */
1845 extern int ext4_orphan_add(handle_t *, struct inode *);
1846 extern int ext4_orphan_del(handle_t *, struct inode *);
1847 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1848                                 __u32 start_minor_hash, __u32 *next_hash);
1849
1850 /* resize.c */
1851 extern int ext4_group_add(struct super_block *sb,
1852                                 struct ext4_new_group_data *input);
1853 extern int ext4_group_extend(struct super_block *sb,
1854                                 struct ext4_super_block *es,
1855                                 ext4_fsblk_t n_blocks_count);
1856
1857 /* super.c */
1858 extern void __ext4_error(struct super_block *, const char *, unsigned int,
1859                          const char *, ...)
1860         __attribute__ ((format (printf, 4, 5)));
1861 #define ext4_error(sb, message...)      __ext4_error(sb, __func__,      \
1862                                                      __LINE__, ## message)
1863 extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1864                              ext4_fsblk_t, const char *, ...)
1865         __attribute__ ((format (printf, 5, 6)));
1866 extern void ext4_error_file(struct file *, const char *, unsigned int,
1867                             ext4_fsblk_t, const char *, ...)
1868         __attribute__ ((format (printf, 5, 6)));
1869 extern void __ext4_std_error(struct super_block *, const char *,
1870                              unsigned int, int);
1871 extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1872                        const char *, ...)
1873         __attribute__ ((format (printf, 4, 5)));
1874 #define ext4_abort(sb, message...)      __ext4_abort(sb, __func__, \
1875                                                        __LINE__, ## message)
1876 extern void __ext4_warning(struct super_block *, const char *, unsigned int,
1877                           const char *, ...)
1878         __attribute__ ((format (printf, 4, 5)));
1879 #define ext4_warning(sb, message...)    __ext4_warning(sb, __func__, \
1880                                                        __LINE__, ## message)
1881 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1882         __attribute__ ((format (printf, 3, 4)));
1883 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1884                            const char *, unsigned int, const char *);
1885 #define dump_mmp_msg(sb, mmp, msg)      __dump_mmp_msg(sb, mmp, __func__, \
1886                                                        __LINE__, msg)
1887 extern void __ext4_grp_locked_error(const char *, unsigned int, \
1888                                     struct super_block *, ext4_group_t, \
1889                                     unsigned long, ext4_fsblk_t, \
1890                                     const char *, ...)
1891         __attribute__ ((format (printf, 7, 8)));
1892 #define ext4_grp_locked_error(sb, grp, message...) \
1893         __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1894 extern void ext4_update_dynamic_rev(struct super_block *sb);
1895 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1896                                         __u32 compat);
1897 extern int ext4_update_rocompat_feature(handle_t *handle,
1898                                         struct super_block *sb, __u32 rocompat);
1899 extern int ext4_update_incompat_feature(handle_t *handle,
1900                                         struct super_block *sb, __u32 incompat);
1901 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1902                                       struct ext4_group_desc *bg);
1903 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1904                                       struct ext4_group_desc *bg);
1905 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1906                                      struct ext4_group_desc *bg);
1907 extern __u32 ext4_free_blks_count(struct super_block *sb,
1908                                 struct ext4_group_desc *bg);
1909 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1910                                  struct ext4_group_desc *bg);
1911 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1912                                 struct ext4_group_desc *bg);
1913 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1914                                    struct ext4_group_desc *bg);
1915 extern void ext4_block_bitmap_set(struct super_block *sb,
1916                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1917 extern void ext4_inode_bitmap_set(struct super_block *sb,
1918                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1919 extern void ext4_inode_table_set(struct super_block *sb,
1920                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1921 extern void ext4_free_blks_set(struct super_block *sb,
1922                                struct ext4_group_desc *bg, __u32 count);
1923 extern void ext4_free_inodes_set(struct super_block *sb,
1924                                 struct ext4_group_desc *bg, __u32 count);
1925 extern void ext4_used_dirs_set(struct super_block *sb,
1926                                 struct ext4_group_desc *bg, __u32 count);
1927 extern void ext4_itable_unused_set(struct super_block *sb,
1928                                    struct ext4_group_desc *bg, __u32 count);
1929 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1930                                    struct ext4_group_desc *gdp);
1931 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1932                                        struct ext4_group_desc *gdp);
1933
1934 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1935 {
1936         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1937                 le32_to_cpu(es->s_blocks_count_lo);
1938 }
1939
1940 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1941 {
1942         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1943                 le32_to_cpu(es->s_r_blocks_count_lo);
1944 }
1945
1946 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1947 {
1948         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1949                 le32_to_cpu(es->s_free_blocks_count_lo);
1950 }
1951
1952 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1953                                          ext4_fsblk_t blk)
1954 {
1955         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1956         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1957 }
1958
1959 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1960                                               ext4_fsblk_t blk)
1961 {
1962         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1963         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1964 }
1965
1966 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1967                                            ext4_fsblk_t blk)
1968 {
1969         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1970         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1971 }
1972
1973 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1974 {
1975         if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1976                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1977                         le32_to_cpu(raw_inode->i_size_lo);
1978         else
1979                 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1980 }
1981
1982 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1983 {
1984         raw_inode->i_size_lo = cpu_to_le32(i_size);
1985         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1986 }
1987
1988 static inline
1989 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1990                                             ext4_group_t group)
1991 {
1992          struct ext4_group_info ***grp_info;
1993          long indexv, indexh;
1994          grp_info = EXT4_SB(sb)->s_group_info;
1995          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1996          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1997          return grp_info[indexv][indexh];
1998 }
1999
2000 /*
2001  * Reading s_groups_count requires using smp_rmb() afterwards.  See
2002  * the locking protocol documented in the comments of ext4_group_add()
2003  * in resize.c
2004  */
2005 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2006 {
2007         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
2008
2009         smp_rmb();
2010         return ngroups;
2011 }
2012
2013 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2014                                              ext4_group_t block_group)
2015 {
2016         return block_group >> sbi->s_log_groups_per_flex;
2017 }
2018
2019 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2020 {
2021         return 1 << sbi->s_log_groups_per_flex;
2022 }
2023
2024 #define ext4_std_error(sb, errno)                               \
2025 do {                                                            \
2026         if ((errno))                                            \
2027                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
2028 } while (0)
2029
2030 #ifdef CONFIG_SMP
2031 /* Each CPU can accumulate percpu_counter_batch blocks in their local
2032  * counters. So we need to make sure we have free blocks more
2033  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
2034  */
2035 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2036 #else
2037 #define EXT4_FREEBLOCKS_WATERMARK 0
2038 #endif
2039
2040 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2041 {
2042         /*
2043          * XXX: replace with spinlock if seen contended -bzzz
2044          */
2045         down_write(&EXT4_I(inode)->i_data_sem);
2046         if (newsize > EXT4_I(inode)->i_disksize)
2047                 EXT4_I(inode)->i_disksize = newsize;
2048         up_write(&EXT4_I(inode)->i_data_sem);
2049         return ;
2050 }
2051
2052 struct ext4_group_info {
2053         unsigned long   bb_state;
2054         struct rb_root  bb_free_root;
2055         ext4_grpblk_t   bb_first_free;  /* first free block */
2056         ext4_grpblk_t   bb_free;        /* total free blocks */
2057         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
2058         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
2059         struct          list_head bb_prealloc_list;
2060 #ifdef DOUBLE_CHECK
2061         void            *bb_bitmap;
2062 #endif
2063         struct rw_semaphore alloc_sem;
2064         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
2065                                          * regions, index is order.
2066                                          * bb_counters[3] = 5 means
2067                                          * 5 free 8-block regions. */
2068 };
2069
2070 #define EXT4_GROUP_INFO_NEED_INIT_BIT   0
2071
2072 #define EXT4_MB_GRP_NEED_INIT(grp)      \
2073         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2074
2075 #define EXT4_MAX_CONTENTION             8
2076 #define EXT4_CONTENTION_THRESHOLD       2
2077
2078 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2079                                               ext4_group_t group)
2080 {
2081         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2082 }
2083
2084 /*
2085  * Returns true if the filesystem is busy enough that attempts to
2086  * access the block group locks has run into contention.
2087  */
2088 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2089 {
2090         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2091 }
2092
2093 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2094 {
2095         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2096         if (spin_trylock(lock))
2097                 /*
2098                  * We're able to grab the lock right away, so drop the
2099                  * lock contention counter.
2100                  */
2101                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2102         else {
2103                 /*
2104                  * The lock is busy, so bump the contention counter,
2105                  * and then wait on the spin lock.
2106                  */
2107                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2108                                   EXT4_MAX_CONTENTION);
2109                 spin_lock(lock);
2110         }
2111 }
2112
2113 static inline void ext4_unlock_group(struct super_block *sb,
2114                                         ext4_group_t group)
2115 {
2116         spin_unlock(ext4_group_lock_ptr(sb, group));
2117 }
2118
2119 static inline void ext4_mark_super_dirty(struct super_block *sb)
2120 {
2121         if (EXT4_SB(sb)->s_journal == NULL)
2122                 sb->s_dirt =1;
2123 }
2124
2125 /*
2126  * Inodes and files operations
2127  */
2128
2129 /* dir.c */
2130 extern const struct file_operations ext4_dir_operations;
2131
2132 /* file.c */
2133 extern const struct inode_operations ext4_file_inode_operations;
2134 extern const struct file_operations ext4_file_operations;
2135 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2136
2137 /* namei.c */
2138 extern const struct inode_operations ext4_dir_inode_operations;
2139 extern const struct inode_operations ext4_special_inode_operations;
2140 extern struct dentry *ext4_get_parent(struct dentry *child);
2141
2142 /* symlink.c */
2143 extern const struct inode_operations ext4_symlink_inode_operations;
2144 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2145
2146 /* block_validity */
2147 extern void ext4_release_system_zone(struct super_block *sb);
2148 extern int ext4_setup_system_zone(struct super_block *sb);
2149 extern int __init ext4_init_system_zone(void);
2150 extern void ext4_exit_system_zone(void);
2151 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2152                                  ext4_fsblk_t start_blk,
2153                                  unsigned int count);
2154
2155 /* extents.c */
2156 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2157 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2158 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2159                                        int chunk);
2160 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2161                                struct ext4_map_blocks *map, int flags);
2162 extern void ext4_ext_truncate(struct inode *);
2163 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2164                                 loff_t length);
2165 extern void ext4_ext_init(struct super_block *);
2166 extern void ext4_ext_release(struct super_block *);
2167 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2168                           loff_t len);
2169 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2170                           ssize_t len);
2171 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2172                            struct ext4_map_blocks *map, int flags);
2173 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2174                         __u64 start, __u64 len);
2175 /* move_extent.c */
2176 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2177                              __u64 start_orig, __u64 start_donor,
2178                              __u64 len, __u64 *moved_len);
2179
2180 /* page-io.c */
2181 extern int __init ext4_init_pageio(void);
2182 extern void ext4_exit_pageio(void);
2183 extern void ext4_ioend_wait(struct inode *);
2184 extern void ext4_free_io_end(ext4_io_end_t *io);
2185 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2186 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2187 extern void ext4_io_submit(struct ext4_io_submit *io);
2188 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2189                                struct page *page,
2190                                int len,
2191                                struct writeback_control *wbc);
2192
2193 /* mmp.c */
2194 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2195
2196 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2197 enum ext4_state_bits {
2198         BH_Uninit       /* blocks are allocated but uninitialized on disk */
2199           = BH_JBDPrivateStart,
2200 };
2201
2202 BUFFER_FNS(Uninit, uninit)
2203 TAS_BUFFER_FNS(Uninit, uninit)
2204
2205 /*
2206  * Add new method to test wether block and inode bitmaps are properly
2207  * initialized. With uninit_bg reading the block from disk is not enough
2208  * to mark the bitmap uptodate. We need to also zero-out the bitmap
2209  */
2210 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2211
2212 static inline int bitmap_uptodate(struct buffer_head *bh)
2213 {
2214         return (buffer_uptodate(bh) &&
2215                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2216 }
2217 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2218 {
2219         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2220 }
2221
2222 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2223
2224 /* For ioend & aio unwritten conversion wait queues */
2225 #define EXT4_WQ_HASH_SZ         37
2226 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
2227                                             EXT4_WQ_HASH_SZ])
2228 #define ext4_aio_mutex(v)  (&ext4__aio_mutex[((unsigned long)(v)) %\
2229                                              EXT4_WQ_HASH_SZ])
2230 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2231 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2232
2233 #endif  /* __KERNEL__ */
2234
2235 #endif  /* _EXT4_H */