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   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  * Always enable hashed directories
  41  */
  42 #define CONFIG_EXT4_INDEX
  43
  44 /*
  45  * Debug code
  46  */
  47 #ifdef EXT4FS_DEBUG
  48 #define ext4_debug(f, a...)                                             \
  49         do {                                                            \
  50                 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",       \
  51                         __FILE__, __LINE__, __FUNCTION__);              \
  52                 printk (KERN_DEBUG f, ## a);                            \
  53         } while (0)
  54 #else
  55 #define ext4_debug(f, a...)     do {} while (0)
  56 #endif
  57
  58 /*
  59  * Special inodes numbers
  60  */
  61 #define EXT4_BAD_INO             1      /* Bad blocks inode */
  62 #define EXT4_ROOT_INO            2      /* Root inode */
  63 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
  64 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
  65 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
  66 #define EXT4_JOURNAL_INO         8      /* Journal inode */
  67
  68 /* First non-reserved inode for old ext4 filesystems */
  69 #define EXT4_GOOD_OLD_FIRST_INO 11
  70
  71 /*
  72  * Maximal count of links to a file
  73  */
  74 #define EXT4_LINK_MAX           65000
  75
  76 /*
  77  * Macro-instructions used to manage several block sizes
  78  */
  79 #define EXT4_MIN_BLOCK_SIZE             1024
  80 #define EXT4_MAX_BLOCK_SIZE             4096
  81 #define EXT4_MIN_BLOCK_LOG_SIZE           10
  82 #ifdef __KERNEL__
  83 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
  84 #else
  85 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  86 #endif
  87 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
  88 #ifdef __KERNEL__
  89 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  90 #else
  91 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  92 #endif
  93 #ifdef __KERNEL__
  94 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
  95 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
  96 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
  97 #else
  98 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
  99                                  EXT4_GOOD_OLD_INODE_SIZE : \
 100                                  (s)->s_inode_size)
 101 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 102                                  EXT4_GOOD_OLD_FIRST_INO : \
 103                                  (s)->s_first_ino)
 104 #endif
 105 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 106
 107 /*
 108  * Macro-instructions used to manage fragments
 109  */
 110 #define EXT4_MIN_FRAG_SIZE              1024
 111 #define EXT4_MAX_FRAG_SIZE              4096
 112 #define EXT4_MIN_FRAG_LOG_SIZE            10
 113 #ifdef __KERNEL__
 114 # define EXT4_FRAG_SIZE(s)              (EXT4_SB(s)->s_frag_size)
 115 # define EXT4_FRAGS_PER_BLOCK(s)        (EXT4_SB(s)->s_frags_per_block)
 116 #else
 117 # define EXT4_FRAG_SIZE(s)              (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 118 # define EXT4_FRAGS_PER_BLOCK(s)        (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
 119 #endif
 120
 121 /*
 122  * Structure of a blocks group descriptor
 123  */
 124 struct ext4_group_desc
 125 {
 126         __le32  bg_block_bitmap;                /* Blocks bitmap block */
 127         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 128         __le32  bg_inode_table;         /* Inodes table block */
 129         __le16  bg_free_blocks_count;   /* Free blocks count */
 130         __le16  bg_free_inodes_count;   /* Free inodes count */
 131         __le16  bg_used_dirs_count;     /* Directories count */
 132         __u16   bg_flags;
 133         __u32   bg_reserved[3];
 134         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 135         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 136         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 137 };
 138
 139 #ifdef __KERNEL__
 140 #include <linux/ext4_fs_i.h>
 141 #include <linux/ext4_fs_sb.h>
 142 #endif
 143 /*
 144  * Macro-instructions used to manage group descriptors
 145  */
 146 #define EXT4_MIN_DESC_SIZE              32
 147 #define EXT4_MIN_DESC_SIZE_64BIT        64
 148 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 149 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 150 #ifdef __KERNEL__
 151 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 152 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 153 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 154 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 155 #else
 156 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 157 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 158 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 159 #endif
 160
 161 /*
 162  * Constants relative to the data blocks
 163  */
 164 #define EXT4_NDIR_BLOCKS                12
 165 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 166 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 167 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 168 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 169
 170 /*
 171  * Inode flags
 172  */
 173 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 174 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 175 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 176 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 177 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 178 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 179 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 180 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 181 /* Reserved for compression usage... */
 182 #define EXT4_DIRTY_FL                   0x00000100
 183 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 184 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 185 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 186 /* End compression flags --- maybe not all used */
 187 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 188 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 189 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 190 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 191 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 192 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 193 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 194 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 195
 196 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 197 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 198
 199 /*
 200  * Inode dynamic state flags
 201  */
 202 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 203 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 204 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 205 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 206
 207 /* Used to pass group descriptor data when online resize is done */
 208 struct ext4_new_group_input {
 209         __u32 group;            /* Group number for this data */
 210         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 211         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 212         __u64 inode_table;      /* Absolute block number of inode table start */
 213         __u32 blocks_count;     /* Total number of blocks in this group */
 214         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 215         __u16 unused;
 216 };
 217
 218 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 219 struct ext4_new_group_data {
 220         __u32 group;
 221         __u64 block_bitmap;
 222         __u64 inode_bitmap;
 223         __u64 inode_table;
 224         __u32 blocks_count;
 225         __u16 reserved_blocks;
 226         __u16 unused;
 227         __u32 free_blocks_count;
 228 };
 229
 230 /*
 231  * Following is used by preallocation code to tell get_blocks() that we
 232  * want uninitialzed extents.
 233  */
 234 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 235
 236 /*
 237  * ioctl commands
 238  */
 239 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 240 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 241 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 242 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 243 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 244 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
 245 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 246 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 247 #ifdef CONFIG_JBD2_DEBUG
 248 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 249 #endif
 250 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 251 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 252
 253 /*
 254  * ioctl commands in 32 bit emulation
 255  */
 256 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 257 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 258 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 259 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 260 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 261 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 262 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 263 #ifdef CONFIG_JBD2_DEBUG
 264 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 265 #endif
 266 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 267 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 268
 269
 270 /*
 271  *  Mount options
 272  */
 273 struct ext4_mount_options {
 274         unsigned long s_mount_opt;
 275         uid_t s_resuid;
 276         gid_t s_resgid;
 277         unsigned long s_commit_interval;
 278 #ifdef CONFIG_QUOTA
 279         int s_jquota_fmt;
 280         char *s_qf_names[MAXQUOTAS];
 281 #endif
 282 };
 283
 284 /*
 285  * Structure of an inode on the disk
 286  */
 287 struct ext4_inode {
 288         __le16  i_mode;         /* File mode */
 289         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 290         __le32  i_size;         /* Size in bytes */
 291         __le32  i_atime;        /* Access time */
 292         __le32  i_ctime;        /* Inode Change time */
 293         __le32  i_mtime;        /* Modification time */
 294         __le32  i_dtime;        /* Deletion Time */
 295         __le16  i_gid;          /* Low 16 bits of Group Id */
 296         __le16  i_links_count;  /* Links count */
 297         __le32  i_blocks;       /* Blocks count */
 298         __le32  i_flags;        /* File flags */
 299         union {
 300                 struct {
 301                         __u32  l_i_reserved1;
 302                 } linux1;
 303                 struct {
 304                         __u32  h_i_translator;
 305                 } hurd1;
 306                 struct {
 307                         __u32  m_i_reserved1;
 308                 } masix1;
 309         } osd1;                         /* OS dependent 1 */
 310         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 311         __le32  i_generation;   /* File version (for NFS) */
 312         __le32  i_file_acl;     /* File ACL */
 313         __le32  i_dir_acl;      /* Directory ACL */
 314         __le32  i_faddr;        /* Fragment address */
 315         union {
 316                 struct {
 317                         __u8    l_i_frag;       /* Fragment number */
 318                         __u8    l_i_fsize;      /* Fragment size */
 319                         __le16  l_i_file_acl_high;
 320                         __le16  l_i_uid_high;   /* these 2 fields */
 321                         __le16  l_i_gid_high;   /* were reserved2[0] */
 322                         __u32   l_i_reserved2;
 323                 } linux2;
 324                 struct {
 325                         __u8    h_i_frag;       /* Fragment number */
 326                         __u8    h_i_fsize;      /* Fragment size */
 327                         __u16   h_i_mode_high;
 328                         __u16   h_i_uid_high;
 329                         __u16   h_i_gid_high;
 330                         __u32   h_i_author;
 331                 } hurd2;
 332                 struct {
 333                         __u8    m_i_frag;       /* Fragment number */
 334                         __u8    m_i_fsize;      /* Fragment size */
 335                         __le16  m_i_file_acl_high;
 336                         __u32   m_i_reserved2[2];
 337                 } masix2;
 338         } osd2;                         /* OS dependent 2 */
 339         __le16  i_extra_isize;
 340         __le16  i_pad1;
 341         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 342         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 343         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 344         __le32  i_crtime;       /* File Creation time */
 345         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 346 };
 347
 348 #define i_size_high     i_dir_acl
 349
 350 #define EXT4_EPOCH_BITS 2
 351 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 352 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 353
 354 /*
 355  * Extended fields will fit into an inode if the filesystem was formatted
 356  * with large inodes (-I 256 or larger) and there are not currently any EAs
 357  * consuming all of the available space. For new inodes we always reserve
 358  * enough space for the kernel's known extended fields, but for inodes
 359  * created with an old kernel this might not have been the case. None of
 360  * the extended inode fields is critical for correct filesystem operation.
 361  * This macro checks if a certain field fits in the inode. Note that
 362  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 363  */
 364 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 365         ((offsetof(typeof(*ext4_inode), field) +        \
 366           sizeof((ext4_inode)->field))                  \
 367         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 368             (einode)->i_extra_isize))                   \
 369
 370 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 371 {
 372        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 373                            time->tv_sec >> 32 : 0) |
 374                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 375 }
 376
 377 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 378 {
 379        if (sizeof(time->tv_sec) > 4)
 380                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 381                                << 32;
 382        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 383 }
 384
 385 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 386 do {                                                                           \
 387         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 388         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 389                 (raw_inode)->xtime ## _extra =                                 \
 390                                 ext4_encode_extra_time(&(inode)->xtime);       \
 391 } while (0)
 392
 393 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 394 do {                                                                           \
 395         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 396                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 397         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 398                 (raw_inode)->xtime ## _extra =                                 \
 399                                 ext4_encode_extra_time(&(einode)->xtime);      \
 400 } while (0)
 401
 402 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 403 do {                                                                           \
 404         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 405         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 406                 ext4_decode_extra_time(&(inode)->xtime,                        \
 407                                        raw_inode->xtime ## _extra);            \
 408 } while (0)
 409
 410 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 411 do {                                                                           \
 412         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 413                 (einode)->xtime.tv_sec =                                       \
 414                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 415         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 416                 ext4_decode_extra_time(&(einode)->xtime,                       \
 417                                        raw_inode->xtime ## _extra);            \
 418 } while (0)
 419
 420 #if defined(__KERNEL__) || defined(__linux__)
 421 #define i_reserved1     osd1.linux1.l_i_reserved1
 422 #define i_frag          osd2.linux2.l_i_frag
 423 #define i_fsize         osd2.linux2.l_i_fsize
 424 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 425 #define i_uid_low       i_uid
 426 #define i_gid_low       i_gid
 427 #define i_uid_high      osd2.linux2.l_i_uid_high
 428 #define i_gid_high      osd2.linux2.l_i_gid_high
 429 #define i_reserved2     osd2.linux2.l_i_reserved2
 430
 431 #elif defined(__GNU__)
 432
 433 #define i_translator    osd1.hurd1.h_i_translator
 434 #define i_frag          osd2.hurd2.h_i_frag;
 435 #define i_fsize         osd2.hurd2.h_i_fsize;
 436 #define i_uid_high      osd2.hurd2.h_i_uid_high
 437 #define i_gid_high      osd2.hurd2.h_i_gid_high
 438 #define i_author        osd2.hurd2.h_i_author
 439
 440 #elif defined(__masix__)
 441
 442 #define i_reserved1     osd1.masix1.m_i_reserved1
 443 #define i_frag          osd2.masix2.m_i_frag
 444 #define i_fsize         osd2.masix2.m_i_fsize
 445 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 446 #define i_reserved2     osd2.masix2.m_i_reserved2
 447
 448 #endif /* defined(__KERNEL__) || defined(__linux__) */
 449
 450 /*
 451  * File system states
 452  */
 453 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 454 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 455 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 456
 457 /*
 458  * Mount flags
 459  */
 460 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 461 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 462 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 463 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 464 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 465 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 466 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 467 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 468 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 469 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 470 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 471 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 472 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 473 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 474 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 475 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 476 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 477 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 478 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 479 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 480 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 481 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 482 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 483 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 484 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
 485
 486 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 487 #ifndef _LINUX_EXT2_FS_H
 488 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 489 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 490 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 491                                          EXT4_MOUNT_##opt)
 492 #else
 493 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 494 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 495 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 496 #endif
 497
 498 #define ext4_set_bit                    ext2_set_bit
 499 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 500 #define ext4_clear_bit                  ext2_clear_bit
 501 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 502 #define ext4_test_bit                   ext2_test_bit
 503 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 504 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 505
 506 /*
 507  * Maximal mount counts between two filesystem checks
 508  */
 509 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 510 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 511
 512 /*
 513  * Behaviour when detecting errors
 514  */
 515 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 516 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 517 #define EXT4_ERRORS_PANIC               3       /* Panic */
 518 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 519
 520 /*
 521  * Structure of the super block
 522  */
 523 struct ext4_super_block {
 524 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 525         __le32  s_blocks_count;         /* Blocks count */
 526         __le32  s_r_blocks_count;       /* Reserved blocks count */
 527         __le32  s_free_blocks_count;    /* Free blocks count */
 528 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 529         __le32  s_first_data_block;     /* First Data Block */
 530         __le32  s_log_block_size;       /* Block size */
 531         __le32  s_log_frag_size;        /* Fragment size */
 532 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 533         __le32  s_frags_per_group;      /* # Fragments per group */
 534         __le32  s_inodes_per_group;     /* # Inodes per group */
 535         __le32  s_mtime;                /* Mount time */
 536 /*30*/  __le32  s_wtime;                /* Write time */
 537         __le16  s_mnt_count;            /* Mount count */
 538         __le16  s_max_mnt_count;        /* Maximal mount count */
 539         __le16  s_magic;                /* Magic signature */
 540         __le16  s_state;                /* File system state */
 541         __le16  s_errors;               /* Behaviour when detecting errors */
 542         __le16  s_minor_rev_level;      /* minor revision level */
 543 /*40*/  __le32  s_lastcheck;            /* time of last check */
 544         __le32  s_checkinterval;        /* max. time between checks */
 545         __le32  s_creator_os;           /* OS */
 546         __le32  s_rev_level;            /* Revision level */
 547 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 548         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 549         /*
 550          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 551          *
 552          * Note: the difference between the compatible feature set and
 553          * the incompatible feature set is that if there is a bit set
 554          * in the incompatible feature set that the kernel doesn't
 555          * know about, it should refuse to mount the filesystem.
 556          *
 557          * e2fsck's requirements are more strict; if it doesn't know
 558          * about a feature in either the compatible or incompatible
 559          * feature set, it must abort and not try to meddle with
 560          * things it doesn't understand...
 561          */
 562         __le32  s_first_ino;            /* First non-reserved inode */
 563         __le16  s_inode_size;           /* size of inode structure */
 564         __le16  s_block_group_nr;       /* block group # of this superblock */
 565         __le32  s_feature_compat;       /* compatible feature set */
 566 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 567         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 568 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 569 /*78*/  char    s_volume_name[16];      /* volume name */
 570 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 571 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 572         /*
 573          * Performance hints.  Directory preallocation should only
 574          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 575          */
 576         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 577         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 578         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 579         /*
 580          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 581          */
 582 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 583 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 584         __le32  s_journal_dev;          /* device number of journal file */
 585         __le32  s_last_orphan;          /* start of list of inodes to delete */
 586         __le32  s_hash_seed[4];         /* HTREE hash seed */
 587         __u8    s_def_hash_version;     /* Default hash version to use */
 588         __u8    s_reserved_char_pad;
 589         __le16  s_desc_size;            /* size of group descriptor */
 590 /*100*/ __le32  s_default_mount_opts;
 591         __le32  s_first_meta_bg;        /* First metablock block group */
 592         __le32  s_mkfs_time;            /* When the filesystem was created */
 593         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 594         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 595 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 596         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 597         __le32  s_free_blocks_count_hi; /* Free blocks count */
 598         __u16   s_min_extra_isize;      /* All inodes have at least # bytes */
 599         __u16   s_want_extra_isize;     /* New inodes should reserve # bytes */
 600         __u32   s_flags;                /* Miscellaneous flags */
 601         __u16   s_raid_stride;          /* RAID stride */
 602         __u16   s_mmp_interval;         /* # seconds to wait in MMP checking */
 603         __u64   s_mmp_block;            /* Block for multi-mount protection */
 604         __u32   s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 605         __u32   s_reserved[163];        /* Padding to the end of the block */
 606 };
 607
 608 #ifdef __KERNEL__
 609 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
 610 {
 611         return sb->s_fs_info;
 612 }
 613 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 614 {
 615         return container_of(inode, struct ext4_inode_info, vfs_inode);
 616 }
 617
 618 static inline struct timespec ext4_current_time(struct inode *inode)
 619 {
 620         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 621                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 622 }
 623
 624
 625 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 626 {
 627         return ino == EXT4_ROOT_INO ||
 628                 ino == EXT4_JOURNAL_INO ||
 629                 ino == EXT4_RESIZE_INO ||
 630                 (ino >= EXT4_FIRST_INO(sb) &&
 631                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 632 }
 633 #else
 634 /* Assume that user mode programs are passing in an ext4fs superblock, not
 635  * a kernel struct super_block.  This will allow us to call the feature-test
 636  * macros from user land. */
 637 #define EXT4_SB(sb)     (sb)
 638 #endif
 639
 640 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 641
 642 /*
 643  * Codes for operating systems
 644  */
 645 #define EXT4_OS_LINUX           0
 646 #define EXT4_OS_HURD            1
 647 #define EXT4_OS_MASIX           2
 648 #define EXT4_OS_FREEBSD         3
 649 #define EXT4_OS_LITES           4
 650
 651 /*
 652  * Revision levels
 653  */
 654 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 655 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 656
 657 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 658 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 659
 660 #define EXT4_GOOD_OLD_INODE_SIZE 128
 661
 662 /*
 663  * Feature set definitions
 664  */
 665
 666 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 667         ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 668 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 669         ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 670 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 671         ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 672 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 673         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 674 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 675         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 676 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 677         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 678 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 679         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 680 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 681         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 682 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 683         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 684
 685 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 686 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 687 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 688 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 689 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 690 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 691
 692 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 693 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 694 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 695 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 696 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 697
 698 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 699 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 700 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 701 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 702 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 703 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 704 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 705
 706 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 707 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 708                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 709                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 710                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 711                                          EXT4_FEATURE_INCOMPAT_64BIT)
 712 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 713                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 714                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 715                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 716                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
 717
 718 /*
 719  * Default values for user and/or group using reserved blocks
 720  */
 721 #define EXT4_DEF_RESUID         0
 722 #define EXT4_DEF_RESGID         0
 723
 724 /*
 725  * Default mount options
 726  */
 727 #define EXT4_DEFM_DEBUG         0x0001
 728 #define EXT4_DEFM_BSDGROUPS     0x0002
 729 #define EXT4_DEFM_XATTR_USER    0x0004
 730 #define EXT4_DEFM_ACL           0x0008
 731 #define EXT4_DEFM_UID16         0x0010
 732 #define EXT4_DEFM_JMODE         0x0060
 733 #define EXT4_DEFM_JMODE_DATA    0x0020
 734 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 735 #define EXT4_DEFM_JMODE_WBACK   0x0060
 736
 737 /*
 738  * Structure of a directory entry
 739  */
 740 #define EXT4_NAME_LEN 255
 741
 742 struct ext4_dir_entry {
 743         __le32  inode;                  /* Inode number */
 744         __le16  rec_len;                /* Directory entry length */
 745         __le16  name_len;               /* Name length */
 746         char    name[EXT4_NAME_LEN];    /* File name */
 747 };
 748
 749 /*
 750  * The new version of the directory entry.  Since EXT4 structures are
 751  * stored in intel byte order, and the name_len field could never be
 752  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 753  * file_type field.
 754  */
 755 struct ext4_dir_entry_2 {
 756         __le32  inode;                  /* Inode number */
 757         __le16  rec_len;                /* Directory entry length */
 758         __u8    name_len;               /* Name length */
 759         __u8    file_type;
 760         char    name[EXT4_NAME_LEN];    /* File name */
 761 };
 762
 763 /*
 764  * Ext4 directory file types.  Only the low 3 bits are used.  The
 765  * other bits are reserved for now.
 766  */
 767 #define EXT4_FT_UNKNOWN         0
 768 #define EXT4_FT_REG_FILE        1
 769 #define EXT4_FT_DIR             2
 770 #define EXT4_FT_CHRDEV          3
 771 #define EXT4_FT_BLKDEV          4
 772 #define EXT4_FT_FIFO            5
 773 #define EXT4_FT_SOCK            6
 774 #define EXT4_FT_SYMLINK         7
 775
 776 #define EXT4_FT_MAX             8
 777
 778 /*
 779  * EXT4_DIR_PAD defines the directory entries boundaries
 780  *
 781  * NOTE: It must be a multiple of 4
 782  */
 783 #define EXT4_DIR_PAD                    4
 784 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 785 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 786                                          ~EXT4_DIR_ROUND)
 787 /*
 788  * Hash Tree Directory indexing
 789  * (c) Daniel Phillips, 2001
 790  */
 791
 792 #ifdef CONFIG_EXT4_INDEX
 793   #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 794                                               EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 795                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 796 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 797 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 798 #else
 799   #define is_dx(dir) 0
 800 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
 801 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
 802 #endif
 803
 804 /* Legal values for the dx_root hash_version field: */
 805
 806 #define DX_HASH_LEGACY          0
 807 #define DX_HASH_HALF_MD4        1
 808 #define DX_HASH_TEA             2
 809
 810 #ifdef __KERNEL__
 811
 812 /* hash info structure used by the directory hash */
 813 struct dx_hash_info
 814 {
 815         u32             hash;
 816         u32             minor_hash;
 817         int             hash_version;
 818         u32             *seed;
 819 };
 820
 821 #define EXT4_HTREE_EOF  0x7fffffff
 822
 823 /*
 824  * Control parameters used by ext4_htree_next_block
 825  */
 826 #define HASH_NB_ALWAYS          1
 827
 828
 829 /*
 830  * Describe an inode's exact location on disk and in memory
 831  */
 832 struct ext4_iloc
 833 {
 834         struct buffer_head *bh;
 835         unsigned long offset;
 836         unsigned long block_group;
 837 };
 838
 839 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 840 {
 841         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 842 }
 843
 844 /*
 845  * This structure is stuffed into the struct file's private_data field
 846  * for directories.  It is where we put information so that we can do
 847  * readdir operations in hash tree order.
 848  */
 849 struct dir_private_info {
 850         struct rb_root  root;
 851         struct rb_node  *curr_node;
 852         struct fname    *extra_fname;
 853         loff_t          last_pos;
 854         __u32           curr_hash;
 855         __u32           curr_minor_hash;
 856         __u32           next_hash;
 857 };
 858
 859 /* calculate the first block number of the group */
 860 static inline ext4_fsblk_t
 861 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
 862 {
 863         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 864                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 865 }
 866
 867 /*
 868  * Special error return code only used by dx_probe() and its callers.
 869  */
 870 #define ERR_BAD_DX_DIR  -75000
 871
 872 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 873                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 874
 875 /*
 876  * Function prototypes
 877  */
 878
 879 /*
 880  * Ok, these declarations are also in <linux/kernel.h> but none of the
 881  * ext4 source programs needs to include it so they are duplicated here.
 882  */
 883 # define NORET_TYPE     /**/
 884 # define ATTRIB_NORET   __attribute__((noreturn))
 885 # define NORET_AND      noreturn,
 886
 887 /* balloc.c */
 888 extern unsigned int ext4_block_group(struct super_block *sb,
 889                         ext4_fsblk_t blocknr);
 890 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 891                         ext4_fsblk_t blocknr);
 892 extern int ext4_bg_has_super(struct super_block *sb, int group);
 893 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
 894 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
 895                         ext4_fsblk_t goal, int *errp);
 896 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
 897                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 898 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
 899                         ext4_fsblk_t block, unsigned long count);
 900 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
 901                                  ext4_fsblk_t block, unsigned long count,
 902                                 unsigned long *pdquot_freed_blocks);
 903 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
 904 extern void ext4_check_blocks_bitmap (struct super_block *);
 905 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
 906                                                     unsigned int block_group,
 907                                                     struct buffer_head ** bh);
 908 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
 909 extern void ext4_init_block_alloc_info(struct inode *);
 910 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
 911
 912 /* dir.c */
 913 extern int ext4_check_dir_entry(const char *, struct inode *,
 914                                 struct ext4_dir_entry_2 *,
 915                                 struct buffer_head *, unsigned long);
 916 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
 917                                     __u32 minor_hash,
 918                                     struct ext4_dir_entry_2 *dirent);
 919 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
 920
 921 /* fsync.c */
 922 extern int ext4_sync_file (struct file *, struct dentry *, int);
 923
 924 /* hash.c */
 925 extern int ext4fs_dirhash(const char *name, int len, struct
 926                           dx_hash_info *hinfo);
 927
 928 /* ialloc.c */
 929 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
 930 extern void ext4_free_inode (handle_t *, struct inode *);
 931 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
 932 extern unsigned long ext4_count_free_inodes (struct super_block *);
 933 extern unsigned long ext4_count_dirs (struct super_block *);
 934 extern void ext4_check_inodes_bitmap (struct super_block *);
 935 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
 936
 937
 938 /* inode.c */
 939 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
 940                 struct buffer_head *bh, ext4_fsblk_t blocknr);
 941 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
 942 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
 943 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
 944         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
 945         int create, int extend_disksize);
 946
 947 extern void ext4_read_inode (struct inode *);
 948 extern int  ext4_write_inode (struct inode *, int);
 949 extern int  ext4_setattr (struct dentry *, struct iattr *);
 950 extern void ext4_delete_inode (struct inode *);
 951 extern int  ext4_sync_inode (handle_t *, struct inode *);
 952 extern void ext4_discard_reservation (struct inode *);
 953 extern void ext4_dirty_inode(struct inode *);
 954 extern int ext4_change_inode_journal_flag(struct inode *, int);
 955 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
 956 extern void ext4_truncate (struct inode *);
 957 extern void ext4_set_inode_flags(struct inode *);
 958 extern void ext4_get_inode_flags(struct ext4_inode_info *);
 959 extern void ext4_set_aops(struct inode *inode);
 960 extern int ext4_writepage_trans_blocks(struct inode *);
 961 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
 962                 struct address_space *mapping, loff_t from);
 963
 964 /* ioctl.c */
 965 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
 966                        unsigned long);
 967 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
 968
 969 /* namei.c */
 970 extern int ext4_orphan_add(handle_t *, struct inode *);
 971 extern int ext4_orphan_del(handle_t *, struct inode *);
 972 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 973                                 __u32 start_minor_hash, __u32 *next_hash);
 974
 975 /* resize.c */
 976 extern int ext4_group_add(struct super_block *sb,
 977                                 struct ext4_new_group_data *input);
 978 extern int ext4_group_extend(struct super_block *sb,
 979                                 struct ext4_super_block *es,
 980                                 ext4_fsblk_t n_blocks_count);
 981
 982 /* super.c */
 983 extern void ext4_error (struct super_block *, const char *, const char *, ...)
 984         __attribute__ ((format (printf, 3, 4)));
 985 extern void __ext4_std_error (struct super_block *, const char *, int);
 986 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
 987         __attribute__ ((format (printf, 3, 4)));
 988 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
 989         __attribute__ ((format (printf, 3, 4)));
 990 extern void ext4_update_dynamic_rev (struct super_block *sb);
 991 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 992                                       struct ext4_group_desc *bg);
 993 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 994                                       struct ext4_group_desc *bg);
 995 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 996                                      struct ext4_group_desc *bg);
 997 extern void ext4_block_bitmap_set(struct super_block *sb,
 998                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
 999 extern void ext4_inode_bitmap_set(struct super_block *sb,
1000                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1001 extern void ext4_inode_table_set(struct super_block *sb,
1002                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1003
1004 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1005 {
1006         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1007                 le32_to_cpu(es->s_blocks_count);
1008 }
1009
1010 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1011 {
1012         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1013                 le32_to_cpu(es->s_r_blocks_count);
1014 }
1015
1016 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1017 {
1018         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1019                 le32_to_cpu(es->s_free_blocks_count);
1020 }
1021
1022 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1023                                          ext4_fsblk_t blk)
1024 {
1025         es->s_blocks_count = cpu_to_le32((u32)blk);
1026         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1027 }
1028
1029 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1030                                               ext4_fsblk_t blk)
1031 {
1032         es->s_free_blocks_count = cpu_to_le32((u32)blk);
1033         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1034 }
1035
1036 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1037                                            ext4_fsblk_t blk)
1038 {
1039         es->s_r_blocks_count = cpu_to_le32((u32)blk);
1040         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1041 }
1042
1043
1044
1045 #define ext4_std_error(sb, errno)                               \
1046 do {                                                            \
1047         if ((errno))                                            \
1048                 __ext4_std_error((sb), __FUNCTION__, (errno));  \
1049 } while (0)
1050
1051 /*
1052  * Inodes and files operations
1053  */
1054
1055 /* dir.c */
1056 extern const struct file_operations ext4_dir_operations;
1057
1058 /* file.c */
1059 extern const struct inode_operations ext4_file_inode_operations;
1060 extern const struct file_operations ext4_file_operations;
1061
1062 /* namei.c */
1063 extern const struct inode_operations ext4_dir_inode_operations;
1064 extern const struct inode_operations ext4_special_inode_operations;
1065
1066 /* symlink.c */
1067 extern const struct inode_operations ext4_symlink_inode_operations;
1068 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1069
1070 /* extents.c */
1071 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1072 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1073 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1074                         ext4_fsblk_t iblock,
1075                         unsigned long max_blocks, struct buffer_head *bh_result,
1076                         int create, int extend_disksize);
1077 extern void ext4_ext_truncate(struct inode *, struct page *);
1078 extern void ext4_ext_init(struct super_block *);
1079 extern void ext4_ext_release(struct super_block *);
1080 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1081                           loff_t len);
1082 static inline int
1083 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1084                         unsigned long max_blocks, struct buffer_head *bh,
1085                         int create, int extend_disksize)
1086 {
1087         if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
1088                 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
1089                                         bh, create, extend_disksize);
1090         return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
1091                                         create, extend_disksize);
1092 }
1093
1094
1095 #endif  /* __KERNEL__ */
1096
1097 #endif  /* _LINUX_EXT4_FS_H */