include/linux/ext4_fs.h

   1 /*
   2  *  linux/include/linux/ext4_fs.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 _LINUX_EXT4_FS_H
  17 #define _LINUX_EXT4_FS_H
  18
  19 #include <linux/types.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/magic.h>
  22
  23 #include <linux/ext4_fs_i.h>
  24
  25 /*
  26  * The second extended filesystem constants/structures
  27  */
  28
  29 /*
  30  * Define EXT4FS_DEBUG to produce debug messages
  31  */
  32 #undef EXT4FS_DEBUG
  33
  34 /*
  35  * Define EXT4_RESERVATION to reserve data blocks for expanding files
  36  */
  37 #define EXT4_DEFAULT_RESERVE_BLOCKS     8
  38 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  39 #define EXT4_MAX_RESERVE_BLOCKS         1027
  40 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
  41
  42 /*
  43  * Debug code
  44  */
  45 #ifdef EXT4FS_DEBUG
  46 #define ext4_debug(f, a...)                                             \
  47         do {                                                            \
  48                 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",       \
  49                         __FILE__, __LINE__, __FUNCTION__);              \
  50                 printk (KERN_DEBUG f, ## a);                            \
  51         } while (0)
  52 #else
  53 #define ext4_debug(f, a...)     do {} while (0)
  54 #endif
  55
  56 #define EXT4_MULTIBLOCK_ALLOCATOR       1
  57
  58 /* prefer goal again. length */
  59 #define EXT4_MB_HINT_MERGE              1
  60 /* blocks already reserved */
  61 #define EXT4_MB_HINT_RESERVED           2
  62 /* metadata is being allocated */
  63 #define EXT4_MB_HINT_METADATA           4
  64 /* first blocks in the file */
  65 #define EXT4_MB_HINT_FIRST              8
  66 /* search for the best chunk */
  67 #define EXT4_MB_HINT_BEST               16
  68 /* data is being allocated */
  69 #define EXT4_MB_HINT_DATA               32
  70 /* don't preallocate (for tails) */
  71 #define EXT4_MB_HINT_NOPREALLOC         64
  72 /* allocate for locality group */
  73 #define EXT4_MB_HINT_GROUP_ALLOC        128
  74 /* allocate goal blocks or none */
  75 #define EXT4_MB_HINT_GOAL_ONLY          256
  76 /* goal is meaningful */
  77 #define EXT4_MB_HINT_TRY_GOAL           512
  78
  79 struct ext4_allocation_request {
  80         /* target inode for block we're allocating */
  81         struct inode *inode;
  82         /* logical block in target inode */
  83         ext4_lblk_t logical;
  84         /* phys. target (a hint) */
  85         ext4_fsblk_t goal;
  86         /* the closest logical allocated block to the left */
  87         ext4_lblk_t lleft;
  88         /* phys. block for ^^^ */
  89         ext4_fsblk_t pleft;
  90         /* the closest logical allocated block to the right */
  91         ext4_lblk_t lright;
  92         /* phys. block for ^^^ */
  93         ext4_fsblk_t pright;
  94         /* how many blocks we want to allocate */
  95         unsigned long len;
  96         /* flags. see above EXT4_MB_HINT_* */
  97         unsigned long flags;
  98 };
  99
 100 /*
 101  * Special inodes numbers
 102  */
 103 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 104 #define EXT4_ROOT_INO            2      /* Root inode */
 105 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 106 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 107 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 108 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 109
 110 /* First non-reserved inode for old ext4 filesystems */
 111 #define EXT4_GOOD_OLD_FIRST_INO 11
 112
 113 /*
 114  * Maximal count of links to a file
 115  */
 116 #define EXT4_LINK_MAX           65000
 117
 118 /*
 119  * Macro-instructions used to manage several block sizes
 120  */
 121 #define EXT4_MIN_BLOCK_SIZE             1024
 122 #define EXT4_MAX_BLOCK_SIZE             65536
 123 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 124 #ifdef __KERNEL__
 125 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 126 #else
 127 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 128 #endif
 129 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
 130 #ifdef __KERNEL__
 131 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 132 #else
 133 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 134 #endif
 135 #ifdef __KERNEL__
 136 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 137 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 138 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 139 #else
 140 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 141                                  EXT4_GOOD_OLD_INODE_SIZE : \
 142                                  (s)->s_inode_size)
 143 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 144                                  EXT4_GOOD_OLD_FIRST_INO : \
 145                                  (s)->s_first_ino)
 146 #endif
 147 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 148
 149 /*
 150  * Structure of a blocks group descriptor
 151  */
 152 struct ext4_group_desc
 153 {
 154         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 155         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 156         __le32  bg_inode_table_lo;      /* Inodes table block */
 157         __le16  bg_free_blocks_count;   /* Free blocks count */
 158         __le16  bg_free_inodes_count;   /* Free inodes count */
 159         __le16  bg_used_dirs_count;     /* Directories count */
 160         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 161         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 162         __le16  bg_itable_unused;       /* Unused inodes count */
 163         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 164         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 165         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 166         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 167         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 168         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 169         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 170         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 171         __u32   bg_reserved2[3];
 172 };
 173
 174 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 175 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 176 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 177
 178 #ifdef __KERNEL__
 179 #include <linux/ext4_fs_i.h>
 180 #include <linux/ext4_fs_sb.h>
 181 #endif
 182 /*
 183  * Macro-instructions used to manage group descriptors
 184  */
 185 #define EXT4_MIN_DESC_SIZE              32
 186 #define EXT4_MIN_DESC_SIZE_64BIT        64
 187 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 188 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 189 #ifdef __KERNEL__
 190 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 191 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 192 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 193 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 194 #else
 195 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 196 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 197 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 198 #endif
 199
 200 /*
 201  * Constants relative to the data blocks
 202  */
 203 #define EXT4_NDIR_BLOCKS                12
 204 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 205 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 206 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 207 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 208
 209 /*
 210  * Inode flags
 211  */
 212 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 213 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 214 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 215 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 216 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 217 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 218 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 219 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 220 /* Reserved for compression usage... */
 221 #define EXT4_DIRTY_FL                   0x00000100
 222 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 223 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 224 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 225 /* End compression flags --- maybe not all used */
 226 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 227 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 228 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 229 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 230 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 231 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 232 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 233 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 234 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 235
 236 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 237 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 238
 239 /*
 240  * Inode dynamic state flags
 241  */
 242 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 243 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 244 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 245 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 246
 247 /* Used to pass group descriptor data when online resize is done */
 248 struct ext4_new_group_input {
 249         __u32 group;            /* Group number for this data */
 250         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 251         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 252         __u64 inode_table;      /* Absolute block number of inode table start */
 253         __u32 blocks_count;     /* Total number of blocks in this group */
 254         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 255         __u16 unused;
 256 };
 257
 258 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 259 struct ext4_new_group_data {
 260         __u32 group;
 261         __u64 block_bitmap;
 262         __u64 inode_bitmap;
 263         __u64 inode_table;
 264         __u32 blocks_count;
 265         __u16 reserved_blocks;
 266         __u16 unused;
 267         __u32 free_blocks_count;
 268 };
 269
 270 /*
 271  * Following is used by preallocation code to tell get_blocks() that we
 272  * want uninitialzed extents.
 273  */
 274 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 275
 276 /*
 277  * ioctl commands
 278  */
 279 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 280 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 281 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 282 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 283 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 284 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
 285 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 286 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 287 #ifdef CONFIG_JBD2_DEBUG
 288 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 289 #endif
 290 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 291 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 292 #define EXT4_IOC_MIGRATE                _IO('f', 7)
 293
 294 /*
 295  * ioctl commands in 32 bit emulation
 296  */
 297 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 298 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 299 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 300 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 301 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 302 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 303 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 304 #ifdef CONFIG_JBD2_DEBUG
 305 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 306 #endif
 307 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 308 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 309
 310
 311 /*
 312  *  Mount options
 313  */
 314 struct ext4_mount_options {
 315         unsigned long s_mount_opt;
 316         uid_t s_resuid;
 317         gid_t s_resgid;
 318         unsigned long s_commit_interval;
 319 #ifdef CONFIG_QUOTA
 320         int s_jquota_fmt;
 321         char *s_qf_names[MAXQUOTAS];
 322 #endif
 323 };
 324
 325 /*
 326  * Structure of an inode on the disk
 327  */
 328 struct ext4_inode {
 329         __le16  i_mode;         /* File mode */
 330         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 331         __le32  i_size_lo;      /* Size in bytes */
 332         __le32  i_atime;        /* Access time */
 333         __le32  i_ctime;        /* Inode Change time */
 334         __le32  i_mtime;        /* Modification time */
 335         __le32  i_dtime;        /* Deletion Time */
 336         __le16  i_gid;          /* Low 16 bits of Group Id */
 337         __le16  i_links_count;  /* Links count */
 338         __le32  i_blocks_lo;    /* Blocks count */
 339         __le32  i_flags;        /* File flags */
 340         union {
 341                 struct {
 342                         __le32  l_i_version;
 343                 } linux1;
 344                 struct {
 345                         __u32  h_i_translator;
 346                 } hurd1;
 347                 struct {
 348                         __u32  m_i_reserved1;
 349                 } masix1;
 350         } osd1;                         /* OS dependent 1 */
 351         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 352         __le32  i_generation;   /* File version (for NFS) */
 353         __le32  i_file_acl_lo;  /* File ACL */
 354         __le32  i_size_high;
 355         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 356         union {
 357                 struct {
 358                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 359                         __le16  l_i_file_acl_high;
 360                         __le16  l_i_uid_high;   /* these 2 fields */
 361                         __le16  l_i_gid_high;   /* were reserved2[0] */
 362                         __u32   l_i_reserved2;
 363                 } linux2;
 364                 struct {
 365                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 366                         __u16   h_i_mode_high;
 367                         __u16   h_i_uid_high;
 368                         __u16   h_i_gid_high;
 369                         __u32   h_i_author;
 370                 } hurd2;
 371                 struct {
 372                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 373                         __le16  m_i_file_acl_high;
 374                         __u32   m_i_reserved2[2];
 375                 } masix2;
 376         } osd2;                         /* OS dependent 2 */
 377         __le16  i_extra_isize;
 378         __le16  i_pad1;
 379         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 380         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 381         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 382         __le32  i_crtime;       /* File Creation time */
 383         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 384         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 385 };
 386
 387
 388 #define EXT4_EPOCH_BITS 2
 389 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 390 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 391
 392 /*
 393  * Extended fields will fit into an inode if the filesystem was formatted
 394  * with large inodes (-I 256 or larger) and there are not currently any EAs
 395  * consuming all of the available space. For new inodes we always reserve
 396  * enough space for the kernel's known extended fields, but for inodes
 397  * created with an old kernel this might not have been the case. None of
 398  * the extended inode fields is critical for correct filesystem operation.
 399  * This macro checks if a certain field fits in the inode. Note that
 400  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 401  */
 402 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 403         ((offsetof(typeof(*ext4_inode), field) +        \
 404           sizeof((ext4_inode)->field))                  \
 405         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 406             (einode)->i_extra_isize))                   \
 407
 408 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 409 {
 410        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 411                            time->tv_sec >> 32 : 0) |
 412                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 413 }
 414
 415 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 416 {
 417        if (sizeof(time->tv_sec) > 4)
 418                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 419                                << 32;
 420        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 421 }
 422
 423 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 424 do {                                                                           \
 425         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 426         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 427                 (raw_inode)->xtime ## _extra =                                 \
 428                                 ext4_encode_extra_time(&(inode)->xtime);       \
 429 } while (0)
 430
 431 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 432 do {                                                                           \
 433         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 434                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 435         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 436                 (raw_inode)->xtime ## _extra =                                 \
 437                                 ext4_encode_extra_time(&(einode)->xtime);      \
 438 } while (0)
 439
 440 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 441 do {                                                                           \
 442         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 443         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 444                 ext4_decode_extra_time(&(inode)->xtime,                        \
 445                                        raw_inode->xtime ## _extra);            \
 446 } while (0)
 447
 448 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 449 do {                                                                           \
 450         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 451                 (einode)->xtime.tv_sec =                                       \
 452                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 453         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 454                 ext4_decode_extra_time(&(einode)->xtime,                       \
 455                                        raw_inode->xtime ## _extra);            \
 456 } while (0)
 457
 458 #define i_disk_version osd1.linux1.l_i_version
 459
 460 #if defined(__KERNEL__) || defined(__linux__)
 461 #define i_reserved1     osd1.linux1.l_i_reserved1
 462 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 463 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 464 #define i_uid_low       i_uid
 465 #define i_gid_low       i_gid
 466 #define i_uid_high      osd2.linux2.l_i_uid_high
 467 #define i_gid_high      osd2.linux2.l_i_gid_high
 468 #define i_reserved2     osd2.linux2.l_i_reserved2
 469
 470 #elif defined(__GNU__)
 471
 472 #define i_translator    osd1.hurd1.h_i_translator
 473 #define i_uid_high      osd2.hurd2.h_i_uid_high
 474 #define i_gid_high      osd2.hurd2.h_i_gid_high
 475 #define i_author        osd2.hurd2.h_i_author
 476
 477 #elif defined(__masix__)
 478
 479 #define i_reserved1     osd1.masix1.m_i_reserved1
 480 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 481 #define i_reserved2     osd2.masix2.m_i_reserved2
 482
 483 #endif /* defined(__KERNEL__) || defined(__linux__) */
 484
 485 /*
 486  * File system states
 487  */
 488 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 489 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 490 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 491
 492 /*
 493  * Misc. filesystem flags
 494  */
 495 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 496 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 497 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 498
 499 /*
 500  * Mount flags
 501  */
 502 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 503 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 504 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 505 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 506 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 507 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 508 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 509 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 510 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 511 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 512 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 513 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 514 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 515 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 516 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 517 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 518 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 519 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 520 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 521 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 522 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 523 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 524 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 525 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 526 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
 527 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 528 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 529 #define EXT4_MOUNT_I_VERSION            0x2000000 /* i_version support */
 530 #define EXT4_MOUNT_MBALLOC              0x4000000 /* Buddy allocation support */
 531 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 532 #ifndef _LINUX_EXT2_FS_H
 533 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 534 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 535 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 536                                          EXT4_MOUNT_##opt)
 537 #else
 538 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 539 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 540 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 541 #endif
 542
 543 #define ext4_set_bit                    ext2_set_bit
 544 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 545 #define ext4_clear_bit                  ext2_clear_bit
 546 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 547 #define ext4_test_bit                   ext2_test_bit
 548 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 549 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 550 #define ext4_find_next_bit              ext2_find_next_bit
 551
 552 /*
 553  * Maximal mount counts between two filesystem checks
 554  */
 555 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 556 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 557
 558 /*
 559  * Behaviour when detecting errors
 560  */
 561 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 562 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 563 #define EXT4_ERRORS_PANIC               3       /* Panic */
 564 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 565
 566 /*
 567  * Structure of the super block
 568  */
 569 struct ext4_super_block {
 570 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 571         __le32  s_blocks_count_lo;      /* Blocks count */
 572         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 573         __le32  s_free_blocks_count_lo; /* Free blocks count */
 574 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 575         __le32  s_first_data_block;     /* First Data Block */
 576         __le32  s_log_block_size;       /* Block size */
 577         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 578 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 579         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 580         __le32  s_inodes_per_group;     /* # Inodes per group */
 581         __le32  s_mtime;                /* Mount time */
 582 /*30*/  __le32  s_wtime;                /* Write time */
 583         __le16  s_mnt_count;            /* Mount count */
 584         __le16  s_max_mnt_count;        /* Maximal mount count */
 585         __le16  s_magic;                /* Magic signature */
 586         __le16  s_state;                /* File system state */
 587         __le16  s_errors;               /* Behaviour when detecting errors */
 588         __le16  s_minor_rev_level;      /* minor revision level */
 589 /*40*/  __le32  s_lastcheck;            /* time of last check */
 590         __le32  s_checkinterval;        /* max. time between checks */
 591         __le32  s_creator_os;           /* OS */
 592         __le32  s_rev_level;            /* Revision level */
 593 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 594         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 595         /*
 596          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 597          *
 598          * Note: the difference between the compatible feature set and
 599          * the incompatible feature set is that if there is a bit set
 600          * in the incompatible feature set that the kernel doesn't
 601          * know about, it should refuse to mount the filesystem.
 602          *
 603          * e2fsck's requirements are more strict; if it doesn't know
 604          * about a feature in either the compatible or incompatible
 605          * feature set, it must abort and not try to meddle with
 606          * things it doesn't understand...
 607          */
 608         __le32  s_first_ino;            /* First non-reserved inode */
 609         __le16  s_inode_size;           /* size of inode structure */
 610         __le16  s_block_group_nr;       /* block group # of this superblock */
 611         __le32  s_feature_compat;       /* compatible feature set */
 612 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 613         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 614 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 615 /*78*/  char    s_volume_name[16];      /* volume name */
 616 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 617 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 618         /*
 619          * Performance hints.  Directory preallocation should only
 620          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 621          */
 622         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 623         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 624         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 625         /*
 626          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 627          */
 628 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 629 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 630         __le32  s_journal_dev;          /* device number of journal file */
 631         __le32  s_last_orphan;          /* start of list of inodes to delete */
 632         __le32  s_hash_seed[4];         /* HTREE hash seed */
 633         __u8    s_def_hash_version;     /* Default hash version to use */
 634         __u8    s_reserved_char_pad;
 635         __le16  s_desc_size;            /* size of group descriptor */
 636 /*100*/ __le32  s_default_mount_opts;
 637         __le32  s_first_meta_bg;        /* First metablock block group */
 638         __le32  s_mkfs_time;            /* When the filesystem was created */
 639         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 640         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 641 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 642         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 643         __le32  s_free_blocks_count_hi; /* Free blocks count */
 644         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 645         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 646         __le32  s_flags;                /* Miscellaneous flags */
 647         __le16  s_raid_stride;          /* RAID stride */
 648         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 649         __le64  s_mmp_block;            /* Block for multi-mount protection */
 650         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 651         __u32   s_reserved[163];        /* Padding to the end of the block */
 652 };
 653
 654 #ifdef __KERNEL__
 655 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
 656 {
 657         return sb->s_fs_info;
 658 }
 659 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 660 {
 661         return container_of(inode, struct ext4_inode_info, vfs_inode);
 662 }
 663
 664 static inline struct timespec ext4_current_time(struct inode *inode)
 665 {
 666         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 667                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 668 }
 669
 670
 671 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 672 {
 673         return ino == EXT4_ROOT_INO ||
 674                 ino == EXT4_JOURNAL_INO ||
 675                 ino == EXT4_RESIZE_INO ||
 676                 (ino >= EXT4_FIRST_INO(sb) &&
 677                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 678 }
 679 #else
 680 /* Assume that user mode programs are passing in an ext4fs superblock, not
 681  * a kernel struct super_block.  This will allow us to call the feature-test
 682  * macros from user land. */
 683 #define EXT4_SB(sb)     (sb)
 684 #endif
 685
 686 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 687
 688 /*
 689  * Codes for operating systems
 690  */
 691 #define EXT4_OS_LINUX           0
 692 #define EXT4_OS_HURD            1
 693 #define EXT4_OS_MASIX           2
 694 #define EXT4_OS_FREEBSD         3
 695 #define EXT4_OS_LITES           4
 696
 697 /*
 698  * Revision levels
 699  */
 700 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 701 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 702
 703 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 704 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 705
 706 #define EXT4_GOOD_OLD_INODE_SIZE 128
 707
 708 /*
 709  * Feature set definitions
 710  */
 711
 712 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 713         ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 714 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 715         ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 716 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 717         ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 718 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 719         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 720 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 721         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 722 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 723         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 724 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 725         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 726 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 727         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 728 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 729         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 730
 731 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 732 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 733 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 734 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 735 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 736 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 737
 738 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 739 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 740 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 741 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 742 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 743 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 744 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 745
 746 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 747 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 748 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 749 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 750 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 751 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 752 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 753 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 754 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 755
 756 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 757 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 758                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 759                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 760                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 761                                          EXT4_FEATURE_INCOMPAT_64BIT| \
 762                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
 763 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 764                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 765                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
 766                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 767                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 768                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
 769                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 770
 771 /*
 772  * Default values for user and/or group using reserved blocks
 773  */
 774 #define EXT4_DEF_RESUID         0
 775 #define EXT4_DEF_RESGID         0
 776
 777 /*
 778  * Default mount options
 779  */
 780 #define EXT4_DEFM_DEBUG         0x0001
 781 #define EXT4_DEFM_BSDGROUPS     0x0002
 782 #define EXT4_DEFM_XATTR_USER    0x0004
 783 #define EXT4_DEFM_ACL           0x0008
 784 #define EXT4_DEFM_UID16         0x0010
 785 #define EXT4_DEFM_JMODE         0x0060
 786 #define EXT4_DEFM_JMODE_DATA    0x0020
 787 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 788 #define EXT4_DEFM_JMODE_WBACK   0x0060
 789
 790 /*
 791  * Structure of a directory entry
 792  */
 793 #define EXT4_NAME_LEN 255
 794
 795 struct ext4_dir_entry {
 796         __le32  inode;                  /* Inode number */
 797         __le16  rec_len;                /* Directory entry length */
 798         __le16  name_len;               /* Name length */
 799         char    name[EXT4_NAME_LEN];    /* File name */
 800 };
 801
 802 /*
 803  * The new version of the directory entry.  Since EXT4 structures are
 804  * stored in intel byte order, and the name_len field could never be
 805  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 806  * file_type field.
 807  */
 808 struct ext4_dir_entry_2 {
 809         __le32  inode;                  /* Inode number */
 810         __le16  rec_len;                /* Directory entry length */
 811         __u8    name_len;               /* Name length */
 812         __u8    file_type;
 813         char    name[EXT4_NAME_LEN];    /* File name */
 814 };
 815
 816 /*
 817  * Ext4 directory file types.  Only the low 3 bits are used.  The
 818  * other bits are reserved for now.
 819  */
 820 #define EXT4_FT_UNKNOWN         0
 821 #define EXT4_FT_REG_FILE        1
 822 #define EXT4_FT_DIR             2
 823 #define EXT4_FT_CHRDEV          3
 824 #define EXT4_FT_BLKDEV          4
 825 #define EXT4_FT_FIFO            5
 826 #define EXT4_FT_SOCK            6
 827 #define EXT4_FT_SYMLINK         7
 828
 829 #define EXT4_FT_MAX             8
 830
 831 /*
 832  * EXT4_DIR_PAD defines the directory entries boundaries
 833  *
 834  * NOTE: It must be a multiple of 4
 835  */
 836 #define EXT4_DIR_PAD                    4
 837 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 838 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 839                                          ~EXT4_DIR_ROUND)
 840 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
 841
 842 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
 843 {
 844         unsigned len = le16_to_cpu(dlen);
 845
 846         if (len == EXT4_MAX_REC_LEN)
 847                 return 1 << 16;
 848         return len;
 849 }
 850
 851 static inline __le16 ext4_rec_len_to_disk(unsigned len)
 852 {
 853         if (len == (1 << 16))
 854                 return cpu_to_le16(EXT4_MAX_REC_LEN);
 855         else if (len > (1 << 16))
 856                 BUG();
 857         return cpu_to_le16(len);
 858 }
 859
 860 /*
 861  * Hash Tree Directory indexing
 862  * (c) Daniel Phillips, 2001
 863  */
 864
 865 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 866                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 867                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 868 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 869 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 870
 871 /* Legal values for the dx_root hash_version field: */
 872
 873 #define DX_HASH_LEGACY          0
 874 #define DX_HASH_HALF_MD4        1
 875 #define DX_HASH_TEA             2
 876
 877 #ifdef __KERNEL__
 878
 879 /* hash info structure used by the directory hash */
 880 struct dx_hash_info
 881 {
 882         u32             hash;
 883         u32             minor_hash;
 884         int             hash_version;
 885         u32             *seed;
 886 };
 887
 888 #define EXT4_HTREE_EOF  0x7fffffff
 889
 890 /*
 891  * Control parameters used by ext4_htree_next_block
 892  */
 893 #define HASH_NB_ALWAYS          1
 894
 895
 896 /*
 897  * Describe an inode's exact location on disk and in memory
 898  */
 899 struct ext4_iloc
 900 {
 901         struct buffer_head *bh;
 902         unsigned long offset;
 903         ext4_group_t block_group;
 904 };
 905
 906 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 907 {
 908         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 909 }
 910
 911 /*
 912  * This structure is stuffed into the struct file's private_data field
 913  * for directories.  It is where we put information so that we can do
 914  * readdir operations in hash tree order.
 915  */
 916 struct dir_private_info {
 917         struct rb_root  root;
 918         struct rb_node  *curr_node;
 919         struct fname    *extra_fname;
 920         loff_t          last_pos;
 921         __u32           curr_hash;
 922         __u32           curr_minor_hash;
 923         __u32           next_hash;
 924 };
 925
 926 /* calculate the first block number of the group */
 927 static inline ext4_fsblk_t
 928 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
 929 {
 930         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 931                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 932 }
 933
 934 /*
 935  * Special error return code only used by dx_probe() and its callers.
 936  */
 937 #define ERR_BAD_DX_DIR  -75000
 938
 939 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 940                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 941
 942 /*
 943  * Function prototypes
 944  */
 945
 946 /*
 947  * Ok, these declarations are also in <linux/kernel.h> but none of the
 948  * ext4 source programs needs to include it so they are duplicated here.
 949  */
 950 # define NORET_TYPE     /**/
 951 # define ATTRIB_NORET   __attribute__((noreturn))
 952 # define NORET_AND      noreturn,
 953
 954 /* balloc.c */
 955 extern unsigned int ext4_block_group(struct super_block *sb,
 956                         ext4_fsblk_t blocknr);
 957 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 958                         ext4_fsblk_t blocknr);
 959 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
 960 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
 961                         ext4_group_t group);
 962 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
 963                         ext4_fsblk_t goal, int *errp);
 964 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
 965                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 966 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
 967                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 968 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
 969                         ext4_fsblk_t block, unsigned long count, int metadata);
 970 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
 971                                  ext4_fsblk_t block, unsigned long count,
 972                                 unsigned long *pdquot_freed_blocks);
 973 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
 974 extern void ext4_check_blocks_bitmap (struct super_block *);
 975 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
 976                                                     ext4_group_t block_group,
 977                                                     struct buffer_head ** bh);
 978 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
 979 extern void ext4_init_block_alloc_info(struct inode *);
 980 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
 981
 982 /* dir.c */
 983 extern int ext4_check_dir_entry(const char *, struct inode *,
 984                                 struct ext4_dir_entry_2 *,
 985                                 struct buffer_head *, unsigned long);
 986 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
 987                                     __u32 minor_hash,
 988                                     struct ext4_dir_entry_2 *dirent);
 989 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
 990
 991 /* fsync.c */
 992 extern int ext4_sync_file (struct file *, struct dentry *, int);
 993
 994 /* hash.c */
 995 extern int ext4fs_dirhash(const char *name, int len, struct
 996                           dx_hash_info *hinfo);
 997
 998 /* ialloc.c */
 999 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
1000 extern void ext4_free_inode (handle_t *, struct inode *);
1001 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
1002 extern unsigned long ext4_count_free_inodes (struct super_block *);
1003 extern unsigned long ext4_count_dirs (struct super_block *);
1004 extern void ext4_check_inodes_bitmap (struct super_block *);
1005 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
1006
1007 /* mballoc.c */
1008 extern long ext4_mb_stats;
1009 extern long ext4_mb_max_to_scan;
1010 extern int ext4_mb_init(struct super_block *, int);
1011 extern int ext4_mb_release(struct super_block *);
1012 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1013                                 struct ext4_allocation_request *, int *);
1014 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1015 extern void ext4_mb_discard_inode_preallocations(struct inode *);
1016 extern int __init init_ext4_mballoc(void);
1017 extern void exit_ext4_mballoc(void);
1018 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1019                 unsigned long, unsigned long, int, unsigned long *);
1020
1021
1022 /* inode.c */
1023 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1024                 struct buffer_head *bh, ext4_fsblk_t blocknr);
1025 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1026                                                 ext4_lblk_t, int, int *);
1027 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1028                                                 ext4_lblk_t, int, int *);
1029 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1030                                 ext4_lblk_t iblock, unsigned long maxblocks,
1031                                 struct buffer_head *bh_result,
1032                                 int create, int extend_disksize);
1033
1034 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1035 extern int  ext4_write_inode (struct inode *, int);
1036 extern int  ext4_setattr (struct dentry *, struct iattr *);
1037 extern void ext4_delete_inode (struct inode *);
1038 extern int  ext4_sync_inode (handle_t *, struct inode *);
1039 extern void ext4_discard_reservation (struct inode *);
1040 extern void ext4_dirty_inode(struct inode *);
1041 extern int ext4_change_inode_journal_flag(struct inode *, int);
1042 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1043 extern void ext4_truncate (struct inode *);
1044 extern void ext4_set_inode_flags(struct inode *);
1045 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1046 extern void ext4_set_aops(struct inode *inode);
1047 extern int ext4_writepage_trans_blocks(struct inode *);
1048 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
1049                 struct address_space *mapping, loff_t from);
1050
1051 /* ioctl.c */
1052 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
1053                        unsigned long);
1054 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
1055
1056 /* migrate.c */
1057 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1058                        unsigned long);
1059 /* namei.c */
1060 extern int ext4_orphan_add(handle_t *, struct inode *);
1061 extern int ext4_orphan_del(handle_t *, struct inode *);
1062 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1063                                 __u32 start_minor_hash, __u32 *next_hash);
1064
1065 /* resize.c */
1066 extern int ext4_group_add(struct super_block *sb,
1067                                 struct ext4_new_group_data *input);
1068 extern int ext4_group_extend(struct super_block *sb,
1069                                 struct ext4_super_block *es,
1070                                 ext4_fsblk_t n_blocks_count);
1071
1072 /* super.c */
1073 extern void ext4_error (struct super_block *, const char *, const char *, ...)
1074         __attribute__ ((format (printf, 3, 4)));
1075 extern void __ext4_std_error (struct super_block *, const char *, int);
1076 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1077         __attribute__ ((format (printf, 3, 4)));
1078 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1079         __attribute__ ((format (printf, 3, 4)));
1080 extern void ext4_update_dynamic_rev (struct super_block *sb);
1081 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1082                                         __u32 compat);
1083 extern int ext4_update_rocompat_feature(handle_t *handle,
1084                                         struct super_block *sb, __u32 rocompat);
1085 extern int ext4_update_incompat_feature(handle_t *handle,
1086                                         struct super_block *sb, __u32 incompat);
1087 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1088                                       struct ext4_group_desc *bg);
1089 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1090                                       struct ext4_group_desc *bg);
1091 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1092                                      struct ext4_group_desc *bg);
1093 extern void ext4_block_bitmap_set(struct super_block *sb,
1094                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1095 extern void ext4_inode_bitmap_set(struct super_block *sb,
1096                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1097 extern void ext4_inode_table_set(struct super_block *sb,
1098                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1099
1100 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1101 {
1102         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1103                 le32_to_cpu(es->s_blocks_count_lo);
1104 }
1105
1106 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1107 {
1108         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1109                 le32_to_cpu(es->s_r_blocks_count_lo);
1110 }
1111
1112 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1113 {
1114         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1115                 le32_to_cpu(es->s_free_blocks_count_lo);
1116 }
1117
1118 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1119                                          ext4_fsblk_t blk)
1120 {
1121         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1122         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1123 }
1124
1125 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1126                                               ext4_fsblk_t blk)
1127 {
1128         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1129         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1130 }
1131
1132 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1133                                            ext4_fsblk_t blk)
1134 {
1135         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1136         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1137 }
1138
1139 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1140 {
1141         return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1142                 le32_to_cpu(raw_inode->i_size_lo);
1143 }
1144
1145 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1146 {
1147         raw_inode->i_size_lo = cpu_to_le32(i_size);
1148         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1149 }
1150
1151 static inline
1152 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1153                                                         ext4_group_t group)
1154 {
1155          struct ext4_group_info ***grp_info;
1156          long indexv, indexh;
1157          grp_info = EXT4_SB(sb)->s_group_info;
1158          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1159          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1160          return grp_info[indexv][indexh];
1161 }
1162
1163
1164 #define ext4_std_error(sb, errno)                               \
1165 do {                                                            \
1166         if ((errno))                                            \
1167                 __ext4_std_error((sb), __FUNCTION__, (errno));  \
1168 } while (0)
1169
1170 /*
1171  * Inodes and files operations
1172  */
1173
1174 /* dir.c */
1175 extern const struct file_operations ext4_dir_operations;
1176
1177 /* file.c */
1178 extern const struct inode_operations ext4_file_inode_operations;
1179 extern const struct file_operations ext4_file_operations;
1180
1181 /* namei.c */
1182 extern const struct inode_operations ext4_dir_inode_operations;
1183 extern const struct inode_operations ext4_special_inode_operations;
1184
1185 /* symlink.c */
1186 extern const struct inode_operations ext4_symlink_inode_operations;
1187 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1188
1189 /* extents.c */
1190 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1191 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1192 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1193                         ext4_lblk_t iblock,
1194                         unsigned long max_blocks, struct buffer_head *bh_result,
1195                         int create, int extend_disksize);
1196 extern void ext4_ext_truncate(struct inode *, struct page *);
1197 extern void ext4_ext_init(struct super_block *);
1198 extern void ext4_ext_release(struct super_block *);
1199 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1200                           loff_t len);
1201 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1202                         sector_t block, unsigned long max_blocks,
1203                         struct buffer_head *bh, int create,
1204                         int extend_disksize);
1205 #endif  /* __KERNEL__ */
1206
1207 #endif  /* _LINUX_EXT4_FS_H */