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 /*
  24  * The second extended filesystem constants/structures
  25  */
  26
  27 /*
  28  * Define EXT4FS_DEBUG to produce debug messages
  29  */
  30 #undef EXT4FS_DEBUG
  31
  32 /*
  33  * Define EXT4_RESERVATION to reserve data blocks for expanding files
  34  */
  35 #define EXT4_DEFAULT_RESERVE_BLOCKS     8
  36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  37 #define EXT4_MAX_RESERVE_BLOCKS         1027
  38 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
  39
  40 /*
  41  * Debug code
  42  */
  43 #ifdef EXT4FS_DEBUG
  44 #define ext4_debug(f, a...)                                             \
  45         do {                                                            \
  46                 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",       \
  47                         __FILE__, __LINE__, __FUNCTION__);              \
  48                 printk (KERN_DEBUG f, ## a);                            \
  49         } while (0)
  50 #else
  51 #define ext4_debug(f, a...)     do {} while (0)
  52 #endif
  53
  54 /*
  55  * Special inodes numbers
  56  */
  57 #define EXT4_BAD_INO             1      /* Bad blocks inode */
  58 #define EXT4_ROOT_INO            2      /* Root inode */
  59 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
  60 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
  61 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
  62 #define EXT4_JOURNAL_INO         8      /* Journal inode */
  63
  64 /* First non-reserved inode for old ext4 filesystems */
  65 #define EXT4_GOOD_OLD_FIRST_INO 11
  66
  67 /*
  68  * Maximal count of links to a file
  69  */
  70 #define EXT4_LINK_MAX           65000
  71
  72 /*
  73  * Macro-instructions used to manage several block sizes
  74  */
  75 #define EXT4_MIN_BLOCK_SIZE             1024
  76 #define EXT4_MAX_BLOCK_SIZE             65536
  77 #define EXT4_MIN_BLOCK_LOG_SIZE         10
  78 #ifdef __KERNEL__
  79 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
  80 #else
  81 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  82 #endif
  83 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
  84 #ifdef __KERNEL__
  85 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  86 #else
  87 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  88 #endif
  89 #ifdef __KERNEL__
  90 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
  91 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
  92 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
  93 #else
  94 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
  95                                  EXT4_GOOD_OLD_INODE_SIZE : \
  96                                  (s)->s_inode_size)
  97 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
  98                                  EXT4_GOOD_OLD_FIRST_INO : \
  99                                  (s)->s_first_ino)
 100 #endif
 101 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 102
 103 /*
 104  * Structure of a blocks group descriptor
 105  */
 106 struct ext4_group_desc
 107 {
 108         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 109         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 110         __le32  bg_inode_table_lo;      /* Inodes table block */
 111         __le16  bg_free_blocks_count;   /* Free blocks count */
 112         __le16  bg_free_inodes_count;   /* Free inodes count */
 113         __le16  bg_used_dirs_count;     /* Directories count */
 114         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 115         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 116         __le16  bg_itable_unused;       /* Unused inodes count */
 117         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 118         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 119         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 120         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 121         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 122         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 123         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 124         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 125         __u32   bg_reserved2[3];
 126 };
 127
 128 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 129 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 130 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 131
 132 #ifdef __KERNEL__
 133 #include <linux/ext4_fs_i.h>
 134 #include <linux/ext4_fs_sb.h>
 135 #endif
 136 /*
 137  * Macro-instructions used to manage group descriptors
 138  */
 139 #define EXT4_MIN_DESC_SIZE              32
 140 #define EXT4_MIN_DESC_SIZE_64BIT        64
 141 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 142 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 143 #ifdef __KERNEL__
 144 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 145 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 146 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 147 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 148 #else
 149 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 150 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 151 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 152 #endif
 153
 154 /*
 155  * Constants relative to the data blocks
 156  */
 157 #define EXT4_NDIR_BLOCKS                12
 158 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 159 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 160 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 161 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 162
 163 /*
 164  * Inode flags
 165  */
 166 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 167 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 168 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 169 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 170 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 171 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 172 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 173 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 174 /* Reserved for compression usage... */
 175 #define EXT4_DIRTY_FL                   0x00000100
 176 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 177 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 178 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 179 /* End compression flags --- maybe not all used */
 180 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 181 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 182 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 183 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 184 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 185 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 186 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 187 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 188 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 189
 190 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 191 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 192
 193 /*
 194  * Inode dynamic state flags
 195  */
 196 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 197 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 198 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 199 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 200
 201 /* Used to pass group descriptor data when online resize is done */
 202 struct ext4_new_group_input {
 203         __u32 group;            /* Group number for this data */
 204         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 205         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 206         __u64 inode_table;      /* Absolute block number of inode table start */
 207         __u32 blocks_count;     /* Total number of blocks in this group */
 208         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 209         __u16 unused;
 210 };
 211
 212 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 213 struct ext4_new_group_data {
 214         __u32 group;
 215         __u64 block_bitmap;
 216         __u64 inode_bitmap;
 217         __u64 inode_table;
 218         __u32 blocks_count;
 219         __u16 reserved_blocks;
 220         __u16 unused;
 221         __u32 free_blocks_count;
 222 };
 223
 224 /*
 225  * Following is used by preallocation code to tell get_blocks() that we
 226  * want uninitialzed extents.
 227  */
 228 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 229
 230 /*
 231  * ioctl commands
 232  */
 233 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 234 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 235 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 236 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 237 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 238 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
 239 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 240 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 241 #ifdef CONFIG_JBD2_DEBUG
 242 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 243 #endif
 244 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 245 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 246
 247 /*
 248  * ioctl commands in 32 bit emulation
 249  */
 250 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 251 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 252 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 253 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 254 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 255 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 256 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 257 #ifdef CONFIG_JBD2_DEBUG
 258 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 259 #endif
 260 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 261 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 262
 263
 264 /*
 265  *  Mount options
 266  */
 267 struct ext4_mount_options {
 268         unsigned long s_mount_opt;
 269         uid_t s_resuid;
 270         gid_t s_resgid;
 271         unsigned long s_commit_interval;
 272 #ifdef CONFIG_QUOTA
 273         int s_jquota_fmt;
 274         char *s_qf_names[MAXQUOTAS];
 275 #endif
 276 };
 277
 278 /*
 279  * Structure of an inode on the disk
 280  */
 281 struct ext4_inode {
 282         __le16  i_mode;         /* File mode */
 283         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 284         __le32  i_size_lo;      /* Size in bytes */
 285         __le32  i_atime;        /* Access time */
 286         __le32  i_ctime;        /* Inode Change time */
 287         __le32  i_mtime;        /* Modification time */
 288         __le32  i_dtime;        /* Deletion Time */
 289         __le16  i_gid;          /* Low 16 bits of Group Id */
 290         __le16  i_links_count;  /* Links count */
 291         __le32  i_blocks_lo;    /* Blocks count */
 292         __le32  i_flags;        /* File flags */
 293         union {
 294                 struct {
 295                         __u32  l_i_reserved1;
 296                 } linux1;
 297                 struct {
 298                         __u32  h_i_translator;
 299                 } hurd1;
 300                 struct {
 301                         __u32  m_i_reserved1;
 302                 } masix1;
 303         } osd1;                         /* OS dependent 1 */
 304         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 305         __le32  i_generation;   /* File version (for NFS) */
 306         __le32  i_file_acl_lo;  /* File ACL */
 307         __le32  i_size_high;
 308         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 309         union {
 310                 struct {
 311                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 312                         __le16  l_i_file_acl_high;
 313                         __le16  l_i_uid_high;   /* these 2 fields */
 314                         __le16  l_i_gid_high;   /* were reserved2[0] */
 315                         __u32   l_i_reserved2;
 316                 } linux2;
 317                 struct {
 318                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 319                         __u16   h_i_mode_high;
 320                         __u16   h_i_uid_high;
 321                         __u16   h_i_gid_high;
 322                         __u32   h_i_author;
 323                 } hurd2;
 324                 struct {
 325                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 326                         __le16  m_i_file_acl_high;
 327                         __u32   m_i_reserved2[2];
 328                 } masix2;
 329         } osd2;                         /* OS dependent 2 */
 330         __le16  i_extra_isize;
 331         __le16  i_pad1;
 332         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 333         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 334         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 335         __le32  i_crtime;       /* File Creation time */
 336         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 337 };
 338
 339
 340 #define EXT4_EPOCH_BITS 2
 341 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 342 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 343
 344 /*
 345  * Extended fields will fit into an inode if the filesystem was formatted
 346  * with large inodes (-I 256 or larger) and there are not currently any EAs
 347  * consuming all of the available space. For new inodes we always reserve
 348  * enough space for the kernel's known extended fields, but for inodes
 349  * created with an old kernel this might not have been the case. None of
 350  * the extended inode fields is critical for correct filesystem operation.
 351  * This macro checks if a certain field fits in the inode. Note that
 352  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 353  */
 354 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 355         ((offsetof(typeof(*ext4_inode), field) +        \
 356           sizeof((ext4_inode)->field))                  \
 357         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 358             (einode)->i_extra_isize))                   \
 359
 360 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 361 {
 362        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 363                            time->tv_sec >> 32 : 0) |
 364                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 365 }
 366
 367 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 368 {
 369        if (sizeof(time->tv_sec) > 4)
 370                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 371                                << 32;
 372        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 373 }
 374
 375 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 376 do {                                                                           \
 377         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 378         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 379                 (raw_inode)->xtime ## _extra =                                 \
 380                                 ext4_encode_extra_time(&(inode)->xtime);       \
 381 } while (0)
 382
 383 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 384 do {                                                                           \
 385         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 386                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 387         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 388                 (raw_inode)->xtime ## _extra =                                 \
 389                                 ext4_encode_extra_time(&(einode)->xtime);      \
 390 } while (0)
 391
 392 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 393 do {                                                                           \
 394         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 395         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 396                 ext4_decode_extra_time(&(inode)->xtime,                        \
 397                                        raw_inode->xtime ## _extra);            \
 398 } while (0)
 399
 400 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 401 do {                                                                           \
 402         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 403                 (einode)->xtime.tv_sec =                                       \
 404                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 405         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 406                 ext4_decode_extra_time(&(einode)->xtime,                       \
 407                                        raw_inode->xtime ## _extra);            \
 408 } while (0)
 409
 410 #if defined(__KERNEL__) || defined(__linux__)
 411 #define i_reserved1     osd1.linux1.l_i_reserved1
 412 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 413 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 414 #define i_uid_low       i_uid
 415 #define i_gid_low       i_gid
 416 #define i_uid_high      osd2.linux2.l_i_uid_high
 417 #define i_gid_high      osd2.linux2.l_i_gid_high
 418 #define i_reserved2     osd2.linux2.l_i_reserved2
 419
 420 #elif defined(__GNU__)
 421
 422 #define i_translator    osd1.hurd1.h_i_translator
 423 #define i_uid_high      osd2.hurd2.h_i_uid_high
 424 #define i_gid_high      osd2.hurd2.h_i_gid_high
 425 #define i_author        osd2.hurd2.h_i_author
 426
 427 #elif defined(__masix__)
 428
 429 #define i_reserved1     osd1.masix1.m_i_reserved1
 430 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 431 #define i_reserved2     osd2.masix2.m_i_reserved2
 432
 433 #endif /* defined(__KERNEL__) || defined(__linux__) */
 434
 435 /*
 436  * File system states
 437  */
 438 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 439 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 440 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 441
 442 /*
 443  * Mount flags
 444  */
 445 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 446 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 447 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 448 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 449 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 450 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 451 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 452 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 453 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 454 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 455 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 456 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 457 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 458 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 459 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 460 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 461 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 462 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 463 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 464 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 465 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 466 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 467 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 468 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 469 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
 470 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 471 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 472 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 473 #ifndef _LINUX_EXT2_FS_H
 474 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 475 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 476 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 477                                          EXT4_MOUNT_##opt)
 478 #else
 479 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 480 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 481 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 482 #endif
 483
 484 #define ext4_set_bit                    ext2_set_bit
 485 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 486 #define ext4_clear_bit                  ext2_clear_bit
 487 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 488 #define ext4_test_bit                   ext2_test_bit
 489 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 490 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 491
 492 /*
 493  * Maximal mount counts between two filesystem checks
 494  */
 495 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 496 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 497
 498 /*
 499  * Behaviour when detecting errors
 500  */
 501 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 502 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 503 #define EXT4_ERRORS_PANIC               3       /* Panic */
 504 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 505
 506 /*
 507  * Structure of the super block
 508  */
 509 struct ext4_super_block {
 510 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 511         __le32  s_blocks_count_lo;      /* Blocks count */
 512         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 513         __le32  s_free_blocks_count_lo; /* Free blocks count */
 514 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 515         __le32  s_first_data_block;     /* First Data Block */
 516         __le32  s_log_block_size;       /* Block size */
 517         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 518 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 519         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 520         __le32  s_inodes_per_group;     /* # Inodes per group */
 521         __le32  s_mtime;                /* Mount time */
 522 /*30*/  __le32  s_wtime;                /* Write time */
 523         __le16  s_mnt_count;            /* Mount count */
 524         __le16  s_max_mnt_count;        /* Maximal mount count */
 525         __le16  s_magic;                /* Magic signature */
 526         __le16  s_state;                /* File system state */
 527         __le16  s_errors;               /* Behaviour when detecting errors */
 528         __le16  s_minor_rev_level;      /* minor revision level */
 529 /*40*/  __le32  s_lastcheck;            /* time of last check */
 530         __le32  s_checkinterval;        /* max. time between checks */
 531         __le32  s_creator_os;           /* OS */
 532         __le32  s_rev_level;            /* Revision level */
 533 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 534         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 535         /*
 536          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 537          *
 538          * Note: the difference between the compatible feature set and
 539          * the incompatible feature set is that if there is a bit set
 540          * in the incompatible feature set that the kernel doesn't
 541          * know about, it should refuse to mount the filesystem.
 542          *
 543          * e2fsck's requirements are more strict; if it doesn't know
 544          * about a feature in either the compatible or incompatible
 545          * feature set, it must abort and not try to meddle with
 546          * things it doesn't understand...
 547          */
 548         __le32  s_first_ino;            /* First non-reserved inode */
 549         __le16  s_inode_size;           /* size of inode structure */
 550         __le16  s_block_group_nr;       /* block group # of this superblock */
 551         __le32  s_feature_compat;       /* compatible feature set */
 552 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 553         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 554 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 555 /*78*/  char    s_volume_name[16];      /* volume name */
 556 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 557 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 558         /*
 559          * Performance hints.  Directory preallocation should only
 560          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 561          */
 562         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 563         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 564         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 565         /*
 566          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 567          */
 568 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 569 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 570         __le32  s_journal_dev;          /* device number of journal file */
 571         __le32  s_last_orphan;          /* start of list of inodes to delete */
 572         __le32  s_hash_seed[4];         /* HTREE hash seed */
 573         __u8    s_def_hash_version;     /* Default hash version to use */
 574         __u8    s_reserved_char_pad;
 575         __le16  s_desc_size;            /* size of group descriptor */
 576 /*100*/ __le32  s_default_mount_opts;
 577         __le32  s_first_meta_bg;        /* First metablock block group */
 578         __le32  s_mkfs_time;            /* When the filesystem was created */
 579         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 580         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 581 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 582         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 583         __le32  s_free_blocks_count_hi; /* Free blocks count */
 584         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 585         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 586         __le32  s_flags;                /* Miscellaneous flags */
 587         __le16  s_raid_stride;          /* RAID stride */
 588         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 589         __le64  s_mmp_block;            /* Block for multi-mount protection */
 590         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 591         __u32   s_reserved[163];        /* Padding to the end of the block */
 592 };
 593
 594 #ifdef __KERNEL__
 595 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
 596 {
 597         return sb->s_fs_info;
 598 }
 599 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 600 {
 601         return container_of(inode, struct ext4_inode_info, vfs_inode);
 602 }
 603
 604 static inline struct timespec ext4_current_time(struct inode *inode)
 605 {
 606         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 607                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 608 }
 609
 610
 611 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 612 {
 613         return ino == EXT4_ROOT_INO ||
 614                 ino == EXT4_JOURNAL_INO ||
 615                 ino == EXT4_RESIZE_INO ||
 616                 (ino >= EXT4_FIRST_INO(sb) &&
 617                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 618 }
 619 #else
 620 /* Assume that user mode programs are passing in an ext4fs superblock, not
 621  * a kernel struct super_block.  This will allow us to call the feature-test
 622  * macros from user land. */
 623 #define EXT4_SB(sb)     (sb)
 624 #endif
 625
 626 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 627
 628 /*
 629  * Codes for operating systems
 630  */
 631 #define EXT4_OS_LINUX           0
 632 #define EXT4_OS_HURD            1
 633 #define EXT4_OS_MASIX           2
 634 #define EXT4_OS_FREEBSD         3
 635 #define EXT4_OS_LITES           4
 636
 637 /*
 638  * Revision levels
 639  */
 640 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 641 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 642
 643 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 644 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 645
 646 #define EXT4_GOOD_OLD_INODE_SIZE 128
 647
 648 /*
 649  * Feature set definitions
 650  */
 651
 652 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 653         ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 654 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 655         ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 656 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 657         ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 658 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 659         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 660 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 661         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 662 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 663         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 664 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 665         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 666 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 667         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 668 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 669         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 670
 671 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 672 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 673 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 674 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 675 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 676 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 677
 678 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 679 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 680 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 681 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 682 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 683 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 684 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 685
 686 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 687 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 688 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 689 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 690 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 691 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 692 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 693 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 694 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 695
 696 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 697 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 698                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 699                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 700                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 701                                          EXT4_FEATURE_INCOMPAT_64BIT| \
 702                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
 703 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 704                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 705                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
 706                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 707                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 708                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
 709                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 710
 711 /*
 712  * Default values for user and/or group using reserved blocks
 713  */
 714 #define EXT4_DEF_RESUID         0
 715 #define EXT4_DEF_RESGID         0
 716
 717 /*
 718  * Default mount options
 719  */
 720 #define EXT4_DEFM_DEBUG         0x0001
 721 #define EXT4_DEFM_BSDGROUPS     0x0002
 722 #define EXT4_DEFM_XATTR_USER    0x0004
 723 #define EXT4_DEFM_ACL           0x0008
 724 #define EXT4_DEFM_UID16         0x0010
 725 #define EXT4_DEFM_JMODE         0x0060
 726 #define EXT4_DEFM_JMODE_DATA    0x0020
 727 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 728 #define EXT4_DEFM_JMODE_WBACK   0x0060
 729
 730 /*
 731  * Structure of a directory entry
 732  */
 733 #define EXT4_NAME_LEN 255
 734
 735 struct ext4_dir_entry {
 736         __le32  inode;                  /* Inode number */
 737         __le16  rec_len;                /* Directory entry length */
 738         __le16  name_len;               /* Name length */
 739         char    name[EXT4_NAME_LEN];    /* File name */
 740 };
 741
 742 /*
 743  * The new version of the directory entry.  Since EXT4 structures are
 744  * stored in intel byte order, and the name_len field could never be
 745  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 746  * file_type field.
 747  */
 748 struct ext4_dir_entry_2 {
 749         __le32  inode;                  /* Inode number */
 750         __le16  rec_len;                /* Directory entry length */
 751         __u8    name_len;               /* Name length */
 752         __u8    file_type;
 753         char    name[EXT4_NAME_LEN];    /* File name */
 754 };
 755
 756 /*
 757  * Ext4 directory file types.  Only the low 3 bits are used.  The
 758  * other bits are reserved for now.
 759  */
 760 #define EXT4_FT_UNKNOWN         0
 761 #define EXT4_FT_REG_FILE        1
 762 #define EXT4_FT_DIR             2
 763 #define EXT4_FT_CHRDEV          3
 764 #define EXT4_FT_BLKDEV          4
 765 #define EXT4_FT_FIFO            5
 766 #define EXT4_FT_SOCK            6
 767 #define EXT4_FT_SYMLINK         7
 768
 769 #define EXT4_FT_MAX             8
 770
 771 /*
 772  * EXT4_DIR_PAD defines the directory entries boundaries
 773  *
 774  * NOTE: It must be a multiple of 4
 775  */
 776 #define EXT4_DIR_PAD                    4
 777 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 778 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 779                                          ~EXT4_DIR_ROUND)
 780 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
 781
 782 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
 783 {
 784         unsigned len = le16_to_cpu(dlen);
 785
 786         if (len == EXT4_MAX_REC_LEN)
 787                 return 1 << 16;
 788         return len;
 789 }
 790
 791 static inline __le16 ext4_rec_len_to_disk(unsigned len)
 792 {
 793         if (len == (1 << 16))
 794                 return cpu_to_le16(EXT4_MAX_REC_LEN);
 795         else if (len > (1 << 16))
 796                 BUG();
 797         return cpu_to_le16(len);
 798 }
 799
 800 /*
 801  * Hash Tree Directory indexing
 802  * (c) Daniel Phillips, 2001
 803  */
 804
 805 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 806                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 807                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 808 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 809 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 810
 811 /* Legal values for the dx_root hash_version field: */
 812
 813 #define DX_HASH_LEGACY          0
 814 #define DX_HASH_HALF_MD4        1
 815 #define DX_HASH_TEA             2
 816
 817 #ifdef __KERNEL__
 818
 819 /* hash info structure used by the directory hash */
 820 struct dx_hash_info
 821 {
 822         u32             hash;
 823         u32             minor_hash;
 824         int             hash_version;
 825         u32             *seed;
 826 };
 827
 828 #define EXT4_HTREE_EOF  0x7fffffff
 829
 830 /*
 831  * Control parameters used by ext4_htree_next_block
 832  */
 833 #define HASH_NB_ALWAYS          1
 834
 835
 836 /*
 837  * Describe an inode's exact location on disk and in memory
 838  */
 839 struct ext4_iloc
 840 {
 841         struct buffer_head *bh;
 842         unsigned long offset;
 843         ext4_group_t block_group;
 844 };
 845
 846 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 847 {
 848         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 849 }
 850
 851 /*
 852  * This structure is stuffed into the struct file's private_data field
 853  * for directories.  It is where we put information so that we can do
 854  * readdir operations in hash tree order.
 855  */
 856 struct dir_private_info {
 857         struct rb_root  root;
 858         struct rb_node  *curr_node;
 859         struct fname    *extra_fname;
 860         loff_t          last_pos;
 861         __u32           curr_hash;
 862         __u32           curr_minor_hash;
 863         __u32           next_hash;
 864 };
 865
 866 /* calculate the first block number of the group */
 867 static inline ext4_fsblk_t
 868 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
 869 {
 870         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 871                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 872 }
 873
 874 /*
 875  * Special error return code only used by dx_probe() and its callers.
 876  */
 877 #define ERR_BAD_DX_DIR  -75000
 878
 879 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 880                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 881
 882 /*
 883  * Function prototypes
 884  */
 885
 886 /*
 887  * Ok, these declarations are also in <linux/kernel.h> but none of the
 888  * ext4 source programs needs to include it so they are duplicated here.
 889  */
 890 # define NORET_TYPE     /**/
 891 # define ATTRIB_NORET   __attribute__((noreturn))
 892 # define NORET_AND      noreturn,
 893
 894 /* balloc.c */
 895 extern unsigned int ext4_block_group(struct super_block *sb,
 896                         ext4_fsblk_t blocknr);
 897 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 898                         ext4_fsblk_t blocknr);
 899 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
 900 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
 901                         ext4_group_t group);
 902 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
 903                         ext4_fsblk_t goal, int *errp);
 904 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
 905                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 906 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
 907                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 908 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
 909                         ext4_fsblk_t block, unsigned long count);
 910 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
 911                                  ext4_fsblk_t block, unsigned long count,
 912                                 unsigned long *pdquot_freed_blocks);
 913 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
 914 extern void ext4_check_blocks_bitmap (struct super_block *);
 915 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
 916                                                     ext4_group_t block_group,
 917                                                     struct buffer_head ** bh);
 918 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
 919 extern void ext4_init_block_alloc_info(struct inode *);
 920 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
 921
 922 /* dir.c */
 923 extern int ext4_check_dir_entry(const char *, struct inode *,
 924                                 struct ext4_dir_entry_2 *,
 925                                 struct buffer_head *, unsigned long);
 926 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
 927                                     __u32 minor_hash,
 928                                     struct ext4_dir_entry_2 *dirent);
 929 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
 930
 931 /* fsync.c */
 932 extern int ext4_sync_file (struct file *, struct dentry *, int);
 933
 934 /* hash.c */
 935 extern int ext4fs_dirhash(const char *name, int len, struct
 936                           dx_hash_info *hinfo);
 937
 938 /* ialloc.c */
 939 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
 940 extern void ext4_free_inode (handle_t *, struct inode *);
 941 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
 942 extern unsigned long ext4_count_free_inodes (struct super_block *);
 943 extern unsigned long ext4_count_dirs (struct super_block *);
 944 extern void ext4_check_inodes_bitmap (struct super_block *);
 945 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
 946
 947
 948 /* inode.c */
 949 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
 950                 struct buffer_head *bh, ext4_fsblk_t blocknr);
 951 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
 952                                                 ext4_lblk_t, int, int *);
 953 struct buffer_head *ext4_bread(handle_t *, struct inode *,
 954                                                 ext4_lblk_t, int, int *);
 955 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
 956                                 ext4_lblk_t iblock, unsigned long maxblocks,
 957                                 struct buffer_head *bh_result,
 958                                 int create, int extend_disksize);
 959
 960 extern void ext4_read_inode (struct inode *);
 961 extern int  ext4_write_inode (struct inode *, int);
 962 extern int  ext4_setattr (struct dentry *, struct iattr *);
 963 extern void ext4_delete_inode (struct inode *);
 964 extern int  ext4_sync_inode (handle_t *, struct inode *);
 965 extern void ext4_discard_reservation (struct inode *);
 966 extern void ext4_dirty_inode(struct inode *);
 967 extern int ext4_change_inode_journal_flag(struct inode *, int);
 968 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
 969 extern void ext4_truncate (struct inode *);
 970 extern void ext4_set_inode_flags(struct inode *);
 971 extern void ext4_get_inode_flags(struct ext4_inode_info *);
 972 extern void ext4_set_aops(struct inode *inode);
 973 extern int ext4_writepage_trans_blocks(struct inode *);
 974 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
 975                 struct address_space *mapping, loff_t from);
 976
 977 /* ioctl.c */
 978 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
 979                        unsigned long);
 980 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
 981
 982 /* namei.c */
 983 extern int ext4_orphan_add(handle_t *, struct inode *);
 984 extern int ext4_orphan_del(handle_t *, struct inode *);
 985 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 986                                 __u32 start_minor_hash, __u32 *next_hash);
 987
 988 /* resize.c */
 989 extern int ext4_group_add(struct super_block *sb,
 990                                 struct ext4_new_group_data *input);
 991 extern int ext4_group_extend(struct super_block *sb,
 992                                 struct ext4_super_block *es,
 993                                 ext4_fsblk_t n_blocks_count);
 994
 995 /* super.c */
 996 extern void ext4_error (struct super_block *, const char *, const char *, ...)
 997         __attribute__ ((format (printf, 3, 4)));
 998 extern void __ext4_std_error (struct super_block *, const char *, int);
 999 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1000         __attribute__ ((format (printf, 3, 4)));
1001 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1002         __attribute__ ((format (printf, 3, 4)));
1003 extern void ext4_update_dynamic_rev (struct super_block *sb);
1004 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1005                                         __u32 compat);
1006 extern int ext4_update_rocompat_feature(handle_t *handle,
1007                                         struct super_block *sb, __u32 rocompat);
1008 extern int ext4_update_incompat_feature(handle_t *handle,
1009                                         struct super_block *sb, __u32 incompat);
1010 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1011                                       struct ext4_group_desc *bg);
1012 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1013                                       struct ext4_group_desc *bg);
1014 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1015                                      struct ext4_group_desc *bg);
1016 extern void ext4_block_bitmap_set(struct super_block *sb,
1017                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1018 extern void ext4_inode_bitmap_set(struct super_block *sb,
1019                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1020 extern void ext4_inode_table_set(struct super_block *sb,
1021                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1022
1023 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1024 {
1025         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1026                 le32_to_cpu(es->s_blocks_count_lo);
1027 }
1028
1029 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1030 {
1031         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1032                 le32_to_cpu(es->s_r_blocks_count_lo);
1033 }
1034
1035 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1036 {
1037         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1038                 le32_to_cpu(es->s_free_blocks_count_lo);
1039 }
1040
1041 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1042                                          ext4_fsblk_t blk)
1043 {
1044         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1045         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1046 }
1047
1048 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1049                                               ext4_fsblk_t blk)
1050 {
1051         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1052         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1053 }
1054
1055 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1056                                            ext4_fsblk_t blk)
1057 {
1058         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1059         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1060 }
1061
1062 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1063 {
1064         return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1065                 le32_to_cpu(raw_inode->i_size_lo);
1066 }
1067
1068 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1069 {
1070         raw_inode->i_size_lo = cpu_to_le32(i_size);
1071         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1072 }
1073
1074 #define ext4_std_error(sb, errno)                               \
1075 do {                                                            \
1076         if ((errno))                                            \
1077                 __ext4_std_error((sb), __FUNCTION__, (errno));  \
1078 } while (0)
1079
1080 /*
1081  * Inodes and files operations
1082  */
1083
1084 /* dir.c */
1085 extern const struct file_operations ext4_dir_operations;
1086
1087 /* file.c */
1088 extern const struct inode_operations ext4_file_inode_operations;
1089 extern const struct file_operations ext4_file_operations;
1090
1091 /* namei.c */
1092 extern const struct inode_operations ext4_dir_inode_operations;
1093 extern const struct inode_operations ext4_special_inode_operations;
1094
1095 /* symlink.c */
1096 extern const struct inode_operations ext4_symlink_inode_operations;
1097 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1098
1099 /* extents.c */
1100 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1101 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1102 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1103                         ext4_lblk_t iblock,
1104                         unsigned long max_blocks, struct buffer_head *bh_result,
1105                         int create, int extend_disksize);
1106 extern void ext4_ext_truncate(struct inode *, struct page *);
1107 extern void ext4_ext_init(struct super_block *);
1108 extern void ext4_ext_release(struct super_block *);
1109 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1110                           loff_t len);
1111 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1112                         sector_t block, unsigned long max_blocks,
1113                         struct buffer_head *bh, int create,
1114                         int extend_disksize);
1115 #endif  /* __KERNEL__ */
1116
1117 #endif  /* _LINUX_EXT4_FS_H */