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             4096
  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;                /* Blocks bitmap block */
 109         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 110         __le32  bg_inode_table;         /* 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         __u16   bg_flags;
 115         __u32   bg_reserved[3];
 116         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 117         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 118         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 119 };
 120
 121 #ifdef __KERNEL__
 122 #include <linux/ext4_fs_i.h>
 123 #include <linux/ext4_fs_sb.h>
 124 #endif
 125 /*
 126  * Macro-instructions used to manage group descriptors
 127  */
 128 #define EXT4_MIN_DESC_SIZE              32
 129 #define EXT4_MIN_DESC_SIZE_64BIT        64
 130 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 131 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 132 #ifdef __KERNEL__
 133 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 134 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 135 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 136 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 137 #else
 138 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 139 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 140 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 141 #endif
 142
 143 /*
 144  * Constants relative to the data blocks
 145  */
 146 #define EXT4_NDIR_BLOCKS                12
 147 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 148 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 149 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 150 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 151
 152 /*
 153  * Inode flags
 154  */
 155 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 156 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 157 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 158 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 159 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 160 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 161 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 162 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 163 /* Reserved for compression usage... */
 164 #define EXT4_DIRTY_FL                   0x00000100
 165 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 166 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 167 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 168 /* End compression flags --- maybe not all used */
 169 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 170 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 171 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 172 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 173 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 174 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 175 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 176 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 177
 178 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 179 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 180
 181 /*
 182  * Inode dynamic state flags
 183  */
 184 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 185 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 186 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 187 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 188
 189 /* Used to pass group descriptor data when online resize is done */
 190 struct ext4_new_group_input {
 191         __u32 group;            /* Group number for this data */
 192         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 193         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 194         __u64 inode_table;      /* Absolute block number of inode table start */
 195         __u32 blocks_count;     /* Total number of blocks in this group */
 196         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 197         __u16 unused;
 198 };
 199
 200 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 201 struct ext4_new_group_data {
 202         __u32 group;
 203         __u64 block_bitmap;
 204         __u64 inode_bitmap;
 205         __u64 inode_table;
 206         __u32 blocks_count;
 207         __u16 reserved_blocks;
 208         __u16 unused;
 209         __u32 free_blocks_count;
 210 };
 211
 212 /*
 213  * Following is used by preallocation code to tell get_blocks() that we
 214  * want uninitialzed extents.
 215  */
 216 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 217
 218 /*
 219  * ioctl commands
 220  */
 221 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 222 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 223 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 224 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 225 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 226 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
 227 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 228 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 229 #ifdef CONFIG_JBD2_DEBUG
 230 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 231 #endif
 232 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 233 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 234
 235 /*
 236  * ioctl commands in 32 bit emulation
 237  */
 238 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 239 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 240 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 241 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 242 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 243 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 244 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 245 #ifdef CONFIG_JBD2_DEBUG
 246 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 247 #endif
 248 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 249 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 250
 251
 252 /*
 253  *  Mount options
 254  */
 255 struct ext4_mount_options {
 256         unsigned long s_mount_opt;
 257         uid_t s_resuid;
 258         gid_t s_resgid;
 259         unsigned long s_commit_interval;
 260 #ifdef CONFIG_QUOTA
 261         int s_jquota_fmt;
 262         char *s_qf_names[MAXQUOTAS];
 263 #endif
 264 };
 265
 266 /*
 267  * Structure of an inode on the disk
 268  */
 269 struct ext4_inode {
 270         __le16  i_mode;         /* File mode */
 271         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 272         __le32  i_size;         /* Size in bytes */
 273         __le32  i_atime;        /* Access time */
 274         __le32  i_ctime;        /* Inode Change time */
 275         __le32  i_mtime;        /* Modification time */
 276         __le32  i_dtime;        /* Deletion Time */
 277         __le16  i_gid;          /* Low 16 bits of Group Id */
 278         __le16  i_links_count;  /* Links count */
 279         __le32  i_blocks;       /* Blocks count */
 280         __le32  i_flags;        /* File flags */
 281         union {
 282                 struct {
 283                         __u32  l_i_reserved1;
 284                 } linux1;
 285                 struct {
 286                         __u32  h_i_translator;
 287                 } hurd1;
 288                 struct {
 289                         __u32  m_i_reserved1;
 290                 } masix1;
 291         } osd1;                         /* OS dependent 1 */
 292         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 293         __le32  i_generation;   /* File version (for NFS) */
 294         __le32  i_file_acl;     /* File ACL */
 295         __le32  i_dir_acl;      /* Directory ACL */
 296         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 297         union {
 298                 struct {
 299                         __le16  l_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 300                         __le16  l_i_file_acl_high;
 301                         __le16  l_i_uid_high;   /* these 2 fields */
 302                         __le16  l_i_gid_high;   /* were reserved2[0] */
 303                         __u32   l_i_reserved2;
 304                 } linux2;
 305                 struct {
 306                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 307                         __u16   h_i_mode_high;
 308                         __u16   h_i_uid_high;
 309                         __u16   h_i_gid_high;
 310                         __u32   h_i_author;
 311                 } hurd2;
 312                 struct {
 313                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 314                         __le16  m_i_file_acl_high;
 315                         __u32   m_i_reserved2[2];
 316                 } masix2;
 317         } osd2;                         /* OS dependent 2 */
 318         __le16  i_extra_isize;
 319         __le16  i_pad1;
 320         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 321         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 322         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 323         __le32  i_crtime;       /* File Creation time */
 324         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 325 };
 326
 327 #define i_size_high     i_dir_acl
 328
 329 #define EXT4_EPOCH_BITS 2
 330 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 331 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 332
 333 /*
 334  * Extended fields will fit into an inode if the filesystem was formatted
 335  * with large inodes (-I 256 or larger) and there are not currently any EAs
 336  * consuming all of the available space. For new inodes we always reserve
 337  * enough space for the kernel's known extended fields, but for inodes
 338  * created with an old kernel this might not have been the case. None of
 339  * the extended inode fields is critical for correct filesystem operation.
 340  * This macro checks if a certain field fits in the inode. Note that
 341  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 342  */
 343 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 344         ((offsetof(typeof(*ext4_inode), field) +        \
 345           sizeof((ext4_inode)->field))                  \
 346         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 347             (einode)->i_extra_isize))                   \
 348
 349 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 350 {
 351        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 352                            time->tv_sec >> 32 : 0) |
 353                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 354 }
 355
 356 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 357 {
 358        if (sizeof(time->tv_sec) > 4)
 359                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 360                                << 32;
 361        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 362 }
 363
 364 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 365 do {                                                                           \
 366         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 367         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 368                 (raw_inode)->xtime ## _extra =                                 \
 369                                 ext4_encode_extra_time(&(inode)->xtime);       \
 370 } while (0)
 371
 372 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 373 do {                                                                           \
 374         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 375                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 376         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 377                 (raw_inode)->xtime ## _extra =                                 \
 378                                 ext4_encode_extra_time(&(einode)->xtime);      \
 379 } while (0)
 380
 381 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 382 do {                                                                           \
 383         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 384         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 385                 ext4_decode_extra_time(&(inode)->xtime,                        \
 386                                        raw_inode->xtime ## _extra);            \
 387 } while (0)
 388
 389 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 390 do {                                                                           \
 391         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 392                 (einode)->xtime.tv_sec =                                       \
 393                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 394         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 395                 ext4_decode_extra_time(&(einode)->xtime,                       \
 396                                        raw_inode->xtime ## _extra);            \
 397 } while (0)
 398
 399 #if defined(__KERNEL__) || defined(__linux__)
 400 #define i_reserved1     osd1.linux1.l_i_reserved1
 401 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 402 #define i_uid_low       i_uid
 403 #define i_gid_low       i_gid
 404 #define i_uid_high      osd2.linux2.l_i_uid_high
 405 #define i_gid_high      osd2.linux2.l_i_gid_high
 406 #define i_reserved2     osd2.linux2.l_i_reserved2
 407
 408 #elif defined(__GNU__)
 409
 410 #define i_translator    osd1.hurd1.h_i_translator
 411 #define i_uid_high      osd2.hurd2.h_i_uid_high
 412 #define i_gid_high      osd2.hurd2.h_i_gid_high
 413 #define i_author        osd2.hurd2.h_i_author
 414
 415 #elif defined(__masix__)
 416
 417 #define i_reserved1     osd1.masix1.m_i_reserved1
 418 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 419 #define i_reserved2     osd2.masix2.m_i_reserved2
 420
 421 #endif /* defined(__KERNEL__) || defined(__linux__) */
 422
 423 /*
 424  * File system states
 425  */
 426 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 427 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 428 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 429
 430 /*
 431  * Mount flags
 432  */
 433 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 434 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 435 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 436 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 437 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 438 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 439 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 440 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 441 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 442 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 443 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 444 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 445 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 446 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 447 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 448 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 449 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 450 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 451 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 452 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 453 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 454 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 455 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 456 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 457 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
 458
 459 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 460 #ifndef _LINUX_EXT2_FS_H
 461 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 462 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 463 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 464                                          EXT4_MOUNT_##opt)
 465 #else
 466 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 467 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 468 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 469 #endif
 470
 471 #define ext4_set_bit                    ext2_set_bit
 472 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 473 #define ext4_clear_bit                  ext2_clear_bit
 474 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 475 #define ext4_test_bit                   ext2_test_bit
 476 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 477 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 478
 479 /*
 480  * Maximal mount counts between two filesystem checks
 481  */
 482 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 483 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 484
 485 /*
 486  * Behaviour when detecting errors
 487  */
 488 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 489 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 490 #define EXT4_ERRORS_PANIC               3       /* Panic */
 491 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 492
 493 /*
 494  * Structure of the super block
 495  */
 496 struct ext4_super_block {
 497 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 498         __le32  s_blocks_count;         /* Blocks count */
 499         __le32  s_r_blocks_count;       /* Reserved blocks count */
 500         __le32  s_free_blocks_count;    /* Free blocks count */
 501 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 502         __le32  s_first_data_block;     /* First Data Block */
 503         __le32  s_log_block_size;       /* Block size */
 504         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 505 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 506         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 507         __le32  s_inodes_per_group;     /* # Inodes per group */
 508         __le32  s_mtime;                /* Mount time */
 509 /*30*/  __le32  s_wtime;                /* Write time */
 510         __le16  s_mnt_count;            /* Mount count */
 511         __le16  s_max_mnt_count;        /* Maximal mount count */
 512         __le16  s_magic;                /* Magic signature */
 513         __le16  s_state;                /* File system state */
 514         __le16  s_errors;               /* Behaviour when detecting errors */
 515         __le16  s_minor_rev_level;      /* minor revision level */
 516 /*40*/  __le32  s_lastcheck;            /* time of last check */
 517         __le32  s_checkinterval;        /* max. time between checks */
 518         __le32  s_creator_os;           /* OS */
 519         __le32  s_rev_level;            /* Revision level */
 520 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 521         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 522         /*
 523          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 524          *
 525          * Note: the difference between the compatible feature set and
 526          * the incompatible feature set is that if there is a bit set
 527          * in the incompatible feature set that the kernel doesn't
 528          * know about, it should refuse to mount the filesystem.
 529          *
 530          * e2fsck's requirements are more strict; if it doesn't know
 531          * about a feature in either the compatible or incompatible
 532          * feature set, it must abort and not try to meddle with
 533          * things it doesn't understand...
 534          */
 535         __le32  s_first_ino;            /* First non-reserved inode */
 536         __le16  s_inode_size;           /* size of inode structure */
 537         __le16  s_block_group_nr;       /* block group # of this superblock */
 538         __le32  s_feature_compat;       /* compatible feature set */
 539 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 540         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 541 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 542 /*78*/  char    s_volume_name[16];      /* volume name */
 543 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 544 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 545         /*
 546          * Performance hints.  Directory preallocation should only
 547          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 548          */
 549         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 550         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 551         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 552         /*
 553          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 554          */
 555 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 556 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 557         __le32  s_journal_dev;          /* device number of journal file */
 558         __le32  s_last_orphan;          /* start of list of inodes to delete */
 559         __le32  s_hash_seed[4];         /* HTREE hash seed */
 560         __u8    s_def_hash_version;     /* Default hash version to use */
 561         __u8    s_reserved_char_pad;
 562         __le16  s_desc_size;            /* size of group descriptor */
 563 /*100*/ __le32  s_default_mount_opts;
 564         __le32  s_first_meta_bg;        /* First metablock block group */
 565         __le32  s_mkfs_time;            /* When the filesystem was created */
 566         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 567         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 568 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 569         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 570         __le32  s_free_blocks_count_hi; /* Free blocks count */
 571         __u16   s_min_extra_isize;      /* All inodes have at least # bytes */
 572         __u16   s_want_extra_isize;     /* New inodes should reserve # bytes */
 573         __u32   s_flags;                /* Miscellaneous flags */
 574         __u16   s_raid_stride;          /* RAID stride */
 575         __u16   s_mmp_interval;         /* # seconds to wait in MMP checking */
 576         __u64   s_mmp_block;            /* Block for multi-mount protection */
 577         __u32   s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 578         __u32   s_reserved[163];        /* Padding to the end of the block */
 579 };
 580
 581 #ifdef __KERNEL__
 582 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
 583 {
 584         return sb->s_fs_info;
 585 }
 586 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 587 {
 588         return container_of(inode, struct ext4_inode_info, vfs_inode);
 589 }
 590
 591 static inline struct timespec ext4_current_time(struct inode *inode)
 592 {
 593         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 594                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 595 }
 596
 597
 598 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 599 {
 600         return ino == EXT4_ROOT_INO ||
 601                 ino == EXT4_JOURNAL_INO ||
 602                 ino == EXT4_RESIZE_INO ||
 603                 (ino >= EXT4_FIRST_INO(sb) &&
 604                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 605 }
 606 #else
 607 /* Assume that user mode programs are passing in an ext4fs superblock, not
 608  * a kernel struct super_block.  This will allow us to call the feature-test
 609  * macros from user land. */
 610 #define EXT4_SB(sb)     (sb)
 611 #endif
 612
 613 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 614
 615 /*
 616  * Codes for operating systems
 617  */
 618 #define EXT4_OS_LINUX           0
 619 #define EXT4_OS_HURD            1
 620 #define EXT4_OS_MASIX           2
 621 #define EXT4_OS_FREEBSD         3
 622 #define EXT4_OS_LITES           4
 623
 624 /*
 625  * Revision levels
 626  */
 627 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 628 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 629
 630 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 631 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 632
 633 #define EXT4_GOOD_OLD_INODE_SIZE 128
 634
 635 /*
 636  * Feature set definitions
 637  */
 638
 639 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 640         ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 641 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 642         ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 643 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 644         ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 645 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 646         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 647 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 648         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 649 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 650         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 651 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 652         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 653 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 654         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 655 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 656         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 657
 658 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 659 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 660 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 661 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 662 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 663 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 664
 665 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 666 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 667 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 668 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 669 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 670
 671 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 672 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 673 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 674 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 675 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 676 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 677 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 678
 679 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 680 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 681                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 682                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 683                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 684                                          EXT4_FEATURE_INCOMPAT_64BIT)
 685 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 686                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 687                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 688                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 689                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
 690
 691 /*
 692  * Default values for user and/or group using reserved blocks
 693  */
 694 #define EXT4_DEF_RESUID         0
 695 #define EXT4_DEF_RESGID         0
 696
 697 /*
 698  * Default mount options
 699  */
 700 #define EXT4_DEFM_DEBUG         0x0001
 701 #define EXT4_DEFM_BSDGROUPS     0x0002
 702 #define EXT4_DEFM_XATTR_USER    0x0004
 703 #define EXT4_DEFM_ACL           0x0008
 704 #define EXT4_DEFM_UID16         0x0010
 705 #define EXT4_DEFM_JMODE         0x0060
 706 #define EXT4_DEFM_JMODE_DATA    0x0020
 707 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 708 #define EXT4_DEFM_JMODE_WBACK   0x0060
 709
 710 /*
 711  * Structure of a directory entry
 712  */
 713 #define EXT4_NAME_LEN 255
 714
 715 struct ext4_dir_entry {
 716         __le32  inode;                  /* Inode number */
 717         __le16  rec_len;                /* Directory entry length */
 718         __le16  name_len;               /* Name length */
 719         char    name[EXT4_NAME_LEN];    /* File name */
 720 };
 721
 722 /*
 723  * The new version of the directory entry.  Since EXT4 structures are
 724  * stored in intel byte order, and the name_len field could never be
 725  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 726  * file_type field.
 727  */
 728 struct ext4_dir_entry_2 {
 729         __le32  inode;                  /* Inode number */
 730         __le16  rec_len;                /* Directory entry length */
 731         __u8    name_len;               /* Name length */
 732         __u8    file_type;
 733         char    name[EXT4_NAME_LEN];    /* File name */
 734 };
 735
 736 /*
 737  * Ext4 directory file types.  Only the low 3 bits are used.  The
 738  * other bits are reserved for now.
 739  */
 740 #define EXT4_FT_UNKNOWN         0
 741 #define EXT4_FT_REG_FILE        1
 742 #define EXT4_FT_DIR             2
 743 #define EXT4_FT_CHRDEV          3
 744 #define EXT4_FT_BLKDEV          4
 745 #define EXT4_FT_FIFO            5
 746 #define EXT4_FT_SOCK            6
 747 #define EXT4_FT_SYMLINK         7
 748
 749 #define EXT4_FT_MAX             8
 750
 751 /*
 752  * EXT4_DIR_PAD defines the directory entries boundaries
 753  *
 754  * NOTE: It must be a multiple of 4
 755  */
 756 #define EXT4_DIR_PAD                    4
 757 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 758 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 759                                          ~EXT4_DIR_ROUND)
 760 /*
 761  * Hash Tree Directory indexing
 762  * (c) Daniel Phillips, 2001
 763  */
 764
 765 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 766                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 767                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 768 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 769 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 770
 771 /* Legal values for the dx_root hash_version field: */
 772
 773 #define DX_HASH_LEGACY          0
 774 #define DX_HASH_HALF_MD4        1
 775 #define DX_HASH_TEA             2
 776
 777 #ifdef __KERNEL__
 778
 779 /* hash info structure used by the directory hash */
 780 struct dx_hash_info
 781 {
 782         u32             hash;
 783         u32             minor_hash;
 784         int             hash_version;
 785         u32             *seed;
 786 };
 787
 788 #define EXT4_HTREE_EOF  0x7fffffff
 789
 790 /*
 791  * Control parameters used by ext4_htree_next_block
 792  */
 793 #define HASH_NB_ALWAYS          1
 794
 795
 796 /*
 797  * Describe an inode's exact location on disk and in memory
 798  */
 799 struct ext4_iloc
 800 {
 801         struct buffer_head *bh;
 802         unsigned long offset;
 803         unsigned long block_group;
 804 };
 805
 806 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 807 {
 808         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 809 }
 810
 811 /*
 812  * This structure is stuffed into the struct file's private_data field
 813  * for directories.  It is where we put information so that we can do
 814  * readdir operations in hash tree order.
 815  */
 816 struct dir_private_info {
 817         struct rb_root  root;
 818         struct rb_node  *curr_node;
 819         struct fname    *extra_fname;
 820         loff_t          last_pos;
 821         __u32           curr_hash;
 822         __u32           curr_minor_hash;
 823         __u32           next_hash;
 824 };
 825
 826 /* calculate the first block number of the group */
 827 static inline ext4_fsblk_t
 828 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
 829 {
 830         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 831                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 832 }
 833
 834 /*
 835  * Special error return code only used by dx_probe() and its callers.
 836  */
 837 #define ERR_BAD_DX_DIR  -75000
 838
 839 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 840                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 841
 842 /*
 843  * Function prototypes
 844  */
 845
 846 /*
 847  * Ok, these declarations are also in <linux/kernel.h> but none of the
 848  * ext4 source programs needs to include it so they are duplicated here.
 849  */
 850 # define NORET_TYPE     /**/
 851 # define ATTRIB_NORET   __attribute__((noreturn))
 852 # define NORET_AND      noreturn,
 853
 854 /* balloc.c */
 855 extern unsigned int ext4_block_group(struct super_block *sb,
 856                         ext4_fsblk_t blocknr);
 857 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 858                         ext4_fsblk_t blocknr);
 859 extern int ext4_bg_has_super(struct super_block *sb, int group);
 860 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
 861 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
 862                         ext4_fsblk_t goal, int *errp);
 863 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
 864                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 865 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
 866                         ext4_fsblk_t block, unsigned long count);
 867 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
 868                                  ext4_fsblk_t block, unsigned long count,
 869                                 unsigned long *pdquot_freed_blocks);
 870 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
 871 extern void ext4_check_blocks_bitmap (struct super_block *);
 872 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
 873                                                     unsigned int block_group,
 874                                                     struct buffer_head ** bh);
 875 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
 876 extern void ext4_init_block_alloc_info(struct inode *);
 877 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
 878
 879 /* dir.c */
 880 extern int ext4_check_dir_entry(const char *, struct inode *,
 881                                 struct ext4_dir_entry_2 *,
 882                                 struct buffer_head *, unsigned long);
 883 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
 884                                     __u32 minor_hash,
 885                                     struct ext4_dir_entry_2 *dirent);
 886 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
 887
 888 /* fsync.c */
 889 extern int ext4_sync_file (struct file *, struct dentry *, int);
 890
 891 /* hash.c */
 892 extern int ext4fs_dirhash(const char *name, int len, struct
 893                           dx_hash_info *hinfo);
 894
 895 /* ialloc.c */
 896 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
 897 extern void ext4_free_inode (handle_t *, struct inode *);
 898 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
 899 extern unsigned long ext4_count_free_inodes (struct super_block *);
 900 extern unsigned long ext4_count_dirs (struct super_block *);
 901 extern void ext4_check_inodes_bitmap (struct super_block *);
 902 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
 903
 904
 905 /* inode.c */
 906 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
 907                 struct buffer_head *bh, ext4_fsblk_t blocknr);
 908 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
 909 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
 910 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
 911         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
 912         int create, int extend_disksize);
 913
 914 extern void ext4_read_inode (struct inode *);
 915 extern int  ext4_write_inode (struct inode *, int);
 916 extern int  ext4_setattr (struct dentry *, struct iattr *);
 917 extern void ext4_delete_inode (struct inode *);
 918 extern int  ext4_sync_inode (handle_t *, struct inode *);
 919 extern void ext4_discard_reservation (struct inode *);
 920 extern void ext4_dirty_inode(struct inode *);
 921 extern int ext4_change_inode_journal_flag(struct inode *, int);
 922 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
 923 extern void ext4_truncate (struct inode *);
 924 extern void ext4_set_inode_flags(struct inode *);
 925 extern void ext4_get_inode_flags(struct ext4_inode_info *);
 926 extern void ext4_set_aops(struct inode *inode);
 927 extern int ext4_writepage_trans_blocks(struct inode *);
 928 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
 929                 struct address_space *mapping, loff_t from);
 930
 931 /* ioctl.c */
 932 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
 933                        unsigned long);
 934 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
 935
 936 /* namei.c */
 937 extern int ext4_orphan_add(handle_t *, struct inode *);
 938 extern int ext4_orphan_del(handle_t *, struct inode *);
 939 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 940                                 __u32 start_minor_hash, __u32 *next_hash);
 941
 942 /* resize.c */
 943 extern int ext4_group_add(struct super_block *sb,
 944                                 struct ext4_new_group_data *input);
 945 extern int ext4_group_extend(struct super_block *sb,
 946                                 struct ext4_super_block *es,
 947                                 ext4_fsblk_t n_blocks_count);
 948
 949 /* super.c */
 950 extern void ext4_error (struct super_block *, const char *, const char *, ...)
 951         __attribute__ ((format (printf, 3, 4)));
 952 extern void __ext4_std_error (struct super_block *, const char *, int);
 953 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
 954         __attribute__ ((format (printf, 3, 4)));
 955 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
 956         __attribute__ ((format (printf, 3, 4)));
 957 extern void ext4_update_dynamic_rev (struct super_block *sb);
 958 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 959                                       struct ext4_group_desc *bg);
 960 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 961                                       struct ext4_group_desc *bg);
 962 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 963                                      struct ext4_group_desc *bg);
 964 extern void ext4_block_bitmap_set(struct super_block *sb,
 965                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
 966 extern void ext4_inode_bitmap_set(struct super_block *sb,
 967                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
 968 extern void ext4_inode_table_set(struct super_block *sb,
 969                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
 970
 971 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
 972 {
 973         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
 974                 le32_to_cpu(es->s_blocks_count);
 975 }
 976
 977 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
 978 {
 979         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
 980                 le32_to_cpu(es->s_r_blocks_count);
 981 }
 982
 983 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
 984 {
 985         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
 986                 le32_to_cpu(es->s_free_blocks_count);
 987 }
 988
 989 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
 990                                          ext4_fsblk_t blk)
 991 {
 992         es->s_blocks_count = cpu_to_le32((u32)blk);
 993         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
 994 }
 995
 996 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
 997                                               ext4_fsblk_t blk)
 998 {
 999         es->s_free_blocks_count = cpu_to_le32((u32)blk);
1000         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1001 }
1002
1003 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1004                                            ext4_fsblk_t blk)
1005 {
1006         es->s_r_blocks_count = cpu_to_le32((u32)blk);
1007         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1008 }
1009
1010
1011
1012 #define ext4_std_error(sb, errno)                               \
1013 do {                                                            \
1014         if ((errno))                                            \
1015                 __ext4_std_error((sb), __FUNCTION__, (errno));  \
1016 } while (0)
1017
1018 /*
1019  * Inodes and files operations
1020  */
1021
1022 /* dir.c */
1023 extern const struct file_operations ext4_dir_operations;
1024
1025 /* file.c */
1026 extern const struct inode_operations ext4_file_inode_operations;
1027 extern const struct file_operations ext4_file_operations;
1028
1029 /* namei.c */
1030 extern const struct inode_operations ext4_dir_inode_operations;
1031 extern const struct inode_operations ext4_special_inode_operations;
1032
1033 /* symlink.c */
1034 extern const struct inode_operations ext4_symlink_inode_operations;
1035 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1036
1037 /* extents.c */
1038 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1039 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1040 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1041                         ext4_fsblk_t iblock,
1042                         unsigned long max_blocks, struct buffer_head *bh_result,
1043                         int create, int extend_disksize);
1044 extern void ext4_ext_truncate(struct inode *, struct page *);
1045 extern void ext4_ext_init(struct super_block *);
1046 extern void ext4_ext_release(struct super_block *);
1047 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1048                           loff_t len);
1049 static inline int
1050 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1051                         unsigned long max_blocks, struct buffer_head *bh,
1052                         int create, int extend_disksize)
1053 {
1054         if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
1055                 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
1056                                         bh, create, extend_disksize);
1057         return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
1058                                         create, extend_disksize);
1059 }
1060
1061
1062 #endif  /* __KERNEL__ */
1063
1064 #endif  /* _LINUX_EXT4_FS_H */