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  * 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  * Structure of a blocks group descriptor
 109  */
 110 struct ext4_group_desc
 111 {
 112         __le32  bg_block_bitmap;                /* Blocks bitmap block */
 113         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 114         __le32  bg_inode_table;         /* Inodes table block */
 115         __le16  bg_free_blocks_count;   /* Free blocks count */
 116         __le16  bg_free_inodes_count;   /* Free inodes count */
 117         __le16  bg_used_dirs_count;     /* Directories count */
 118         __u16   bg_flags;
 119         __u32   bg_reserved[3];
 120         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 121         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 122         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 123 };
 124
 125 #ifdef __KERNEL__
 126 #include <linux/ext4_fs_i.h>
 127 #include <linux/ext4_fs_sb.h>
 128 #endif
 129 /*
 130  * Macro-instructions used to manage group descriptors
 131  */
 132 #define EXT4_MIN_DESC_SIZE              32
 133 #define EXT4_MIN_DESC_SIZE_64BIT        64
 134 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 135 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 136 #ifdef __KERNEL__
 137 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 138 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 139 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 140 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 141 #else
 142 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 143 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 144 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 145 #endif
 146
 147 /*
 148  * Constants relative to the data blocks
 149  */
 150 #define EXT4_NDIR_BLOCKS                12
 151 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 152 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 153 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 154 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 155
 156 /*
 157  * Inode flags
 158  */
 159 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 160 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 161 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 162 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 163 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 164 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 165 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 166 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 167 /* Reserved for compression usage... */
 168 #define EXT4_DIRTY_FL                   0x00000100
 169 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 170 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 171 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 172 /* End compression flags --- maybe not all used */
 173 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 174 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 175 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 176 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 177 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 178 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 179 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 180 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 181
 182 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 183 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 184
 185 /*
 186  * Inode dynamic state flags
 187  */
 188 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 189 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 190 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 191 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 192
 193 /* Used to pass group descriptor data when online resize is done */
 194 struct ext4_new_group_input {
 195         __u32 group;            /* Group number for this data */
 196         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 197         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 198         __u64 inode_table;      /* Absolute block number of inode table start */
 199         __u32 blocks_count;     /* Total number of blocks in this group */
 200         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 201         __u16 unused;
 202 };
 203
 204 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 205 struct ext4_new_group_data {
 206         __u32 group;
 207         __u64 block_bitmap;
 208         __u64 inode_bitmap;
 209         __u64 inode_table;
 210         __u32 blocks_count;
 211         __u16 reserved_blocks;
 212         __u16 unused;
 213         __u32 free_blocks_count;
 214 };
 215
 216 /*
 217  * Following is used by preallocation code to tell get_blocks() that we
 218  * want uninitialzed extents.
 219  */
 220 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 221
 222 /*
 223  * ioctl commands
 224  */
 225 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 226 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 227 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 228 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 229 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 230 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
 231 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 232 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 233 #ifdef CONFIG_JBD2_DEBUG
 234 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 235 #endif
 236 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 237 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 238
 239 /*
 240  * ioctl commands in 32 bit emulation
 241  */
 242 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 243 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 244 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 245 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 246 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 247 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 248 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 249 #ifdef CONFIG_JBD2_DEBUG
 250 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 251 #endif
 252 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 253 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 254
 255
 256 /*
 257  *  Mount options
 258  */
 259 struct ext4_mount_options {
 260         unsigned long s_mount_opt;
 261         uid_t s_resuid;
 262         gid_t s_resgid;
 263         unsigned long s_commit_interval;
 264 #ifdef CONFIG_QUOTA
 265         int s_jquota_fmt;
 266         char *s_qf_names[MAXQUOTAS];
 267 #endif
 268 };
 269
 270 /*
 271  * Structure of an inode on the disk
 272  */
 273 struct ext4_inode {
 274         __le16  i_mode;         /* File mode */
 275         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 276         __le32  i_size;         /* Size in bytes */
 277         __le32  i_atime;        /* Access time */
 278         __le32  i_ctime;        /* Inode Change time */
 279         __le32  i_mtime;        /* Modification time */
 280         __le32  i_dtime;        /* Deletion Time */
 281         __le16  i_gid;          /* Low 16 bits of Group Id */
 282         __le16  i_links_count;  /* Links count */
 283         __le32  i_blocks;       /* Blocks count */
 284         __le32  i_flags;        /* File flags */
 285         union {
 286                 struct {
 287                         __u32  l_i_reserved1;
 288                 } linux1;
 289                 struct {
 290                         __u32  h_i_translator;
 291                 } hurd1;
 292                 struct {
 293                         __u32  m_i_reserved1;
 294                 } masix1;
 295         } osd1;                         /* OS dependent 1 */
 296         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 297         __le32  i_generation;   /* File version (for NFS) */
 298         __le32  i_file_acl;     /* File ACL */
 299         __le32  i_dir_acl;      /* Directory ACL */
 300         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 301         union {
 302                 struct {
 303                         __le16  l_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 304                         __le16  l_i_file_acl_high;
 305                         __le16  l_i_uid_high;   /* these 2 fields */
 306                         __le16  l_i_gid_high;   /* were reserved2[0] */
 307                         __u32   l_i_reserved2;
 308                 } linux2;
 309                 struct {
 310                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 311                         __u16   h_i_mode_high;
 312                         __u16   h_i_uid_high;
 313                         __u16   h_i_gid_high;
 314                         __u32   h_i_author;
 315                 } hurd2;
 316                 struct {
 317                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 318                         __le16  m_i_file_acl_high;
 319                         __u32   m_i_reserved2[2];
 320                 } masix2;
 321         } osd2;                         /* OS dependent 2 */
 322         __le16  i_extra_isize;
 323         __le16  i_pad1;
 324         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 325         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 326         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 327         __le32  i_crtime;       /* File Creation time */
 328         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 329 };
 330
 331 #define i_size_high     i_dir_acl
 332
 333 #define EXT4_EPOCH_BITS 2
 334 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 335 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 336
 337 /*
 338  * Extended fields will fit into an inode if the filesystem was formatted
 339  * with large inodes (-I 256 or larger) and there are not currently any EAs
 340  * consuming all of the available space. For new inodes we always reserve
 341  * enough space for the kernel's known extended fields, but for inodes
 342  * created with an old kernel this might not have been the case. None of
 343  * the extended inode fields is critical for correct filesystem operation.
 344  * This macro checks if a certain field fits in the inode. Note that
 345  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 346  */
 347 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 348         ((offsetof(typeof(*ext4_inode), field) +        \
 349           sizeof((ext4_inode)->field))                  \
 350         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 351             (einode)->i_extra_isize))                   \
 352
 353 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 354 {
 355        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 356                            time->tv_sec >> 32 : 0) |
 357                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 358 }
 359
 360 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 361 {
 362        if (sizeof(time->tv_sec) > 4)
 363                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 364                                << 32;
 365        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 366 }
 367
 368 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 369 do {                                                                           \
 370         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 371         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 372                 (raw_inode)->xtime ## _extra =                                 \
 373                                 ext4_encode_extra_time(&(inode)->xtime);       \
 374 } while (0)
 375
 376 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 377 do {                                                                           \
 378         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 379                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 380         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 381                 (raw_inode)->xtime ## _extra =                                 \
 382                                 ext4_encode_extra_time(&(einode)->xtime);      \
 383 } while (0)
 384
 385 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 386 do {                                                                           \
 387         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 388         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 389                 ext4_decode_extra_time(&(inode)->xtime,                        \
 390                                        raw_inode->xtime ## _extra);            \
 391 } while (0)
 392
 393 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 394 do {                                                                           \
 395         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 396                 (einode)->xtime.tv_sec =                                       \
 397                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 398         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 399                 ext4_decode_extra_time(&(einode)->xtime,                       \
 400                                        raw_inode->xtime ## _extra);            \
 401 } while (0)
 402
 403 #if defined(__KERNEL__) || defined(__linux__)
 404 #define i_reserved1     osd1.linux1.l_i_reserved1
 405 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 406 #define i_uid_low       i_uid
 407 #define i_gid_low       i_gid
 408 #define i_uid_high      osd2.linux2.l_i_uid_high
 409 #define i_gid_high      osd2.linux2.l_i_gid_high
 410 #define i_reserved2     osd2.linux2.l_i_reserved2
 411
 412 #elif defined(__GNU__)
 413
 414 #define i_translator    osd1.hurd1.h_i_translator
 415 #define i_uid_high      osd2.hurd2.h_i_uid_high
 416 #define i_gid_high      osd2.hurd2.h_i_gid_high
 417 #define i_author        osd2.hurd2.h_i_author
 418
 419 #elif defined(__masix__)
 420
 421 #define i_reserved1     osd1.masix1.m_i_reserved1
 422 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 423 #define i_reserved2     osd2.masix2.m_i_reserved2
 424
 425 #endif /* defined(__KERNEL__) || defined(__linux__) */
 426
 427 /*
 428  * File system states
 429  */
 430 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 431 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 432 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 433
 434 /*
 435  * Mount flags
 436  */
 437 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 438 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 439 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 440 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 441 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 442 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 443 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 444 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 445 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 446 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 447 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 448 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 449 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 450 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 451 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 452 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 453 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 454 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 455 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 456 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 457 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 458 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 459 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 460 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 461 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
 462
 463 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 464 #ifndef _LINUX_EXT2_FS_H
 465 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 466 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 467 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 468                                          EXT4_MOUNT_##opt)
 469 #else
 470 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 471 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 472 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 473 #endif
 474
 475 #define ext4_set_bit                    ext2_set_bit
 476 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 477 #define ext4_clear_bit                  ext2_clear_bit
 478 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 479 #define ext4_test_bit                   ext2_test_bit
 480 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 481 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 482
 483 /*
 484  * Maximal mount counts between two filesystem checks
 485  */
 486 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 487 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 488
 489 /*
 490  * Behaviour when detecting errors
 491  */
 492 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 493 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 494 #define EXT4_ERRORS_PANIC               3       /* Panic */
 495 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 496
 497 /*
 498  * Structure of the super block
 499  */
 500 struct ext4_super_block {
 501 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 502         __le32  s_blocks_count;         /* Blocks count */
 503         __le32  s_r_blocks_count;       /* Reserved blocks count */
 504         __le32  s_free_blocks_count;    /* Free blocks count */
 505 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 506         __le32  s_first_data_block;     /* First Data Block */
 507         __le32  s_log_block_size;       /* Block size */
 508         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 509 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 510         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 511         __le32  s_inodes_per_group;     /* # Inodes per group */
 512         __le32  s_mtime;                /* Mount time */
 513 /*30*/  __le32  s_wtime;                /* Write time */
 514         __le16  s_mnt_count;            /* Mount count */
 515         __le16  s_max_mnt_count;        /* Maximal mount count */
 516         __le16  s_magic;                /* Magic signature */
 517         __le16  s_state;                /* File system state */
 518         __le16  s_errors;               /* Behaviour when detecting errors */
 519         __le16  s_minor_rev_level;      /* minor revision level */
 520 /*40*/  __le32  s_lastcheck;            /* time of last check */
 521         __le32  s_checkinterval;        /* max. time between checks */
 522         __le32  s_creator_os;           /* OS */
 523         __le32  s_rev_level;            /* Revision level */
 524 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 525         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 526         /*
 527          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 528          *
 529          * Note: the difference between the compatible feature set and
 530          * the incompatible feature set is that if there is a bit set
 531          * in the incompatible feature set that the kernel doesn't
 532          * know about, it should refuse to mount the filesystem.
 533          *
 534          * e2fsck's requirements are more strict; if it doesn't know
 535          * about a feature in either the compatible or incompatible
 536          * feature set, it must abort and not try to meddle with
 537          * things it doesn't understand...
 538          */
 539         __le32  s_first_ino;            /* First non-reserved inode */
 540         __le16  s_inode_size;           /* size of inode structure */
 541         __le16  s_block_group_nr;       /* block group # of this superblock */
 542         __le32  s_feature_compat;       /* compatible feature set */
 543 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 544         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 545 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 546 /*78*/  char    s_volume_name[16];      /* volume name */
 547 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 548 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 549         /*
 550          * Performance hints.  Directory preallocation should only
 551          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 552          */
 553         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 554         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 555         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 556         /*
 557          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 558          */
 559 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 560 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 561         __le32  s_journal_dev;          /* device number of journal file */
 562         __le32  s_last_orphan;          /* start of list of inodes to delete */
 563         __le32  s_hash_seed[4];         /* HTREE hash seed */
 564         __u8    s_def_hash_version;     /* Default hash version to use */
 565         __u8    s_reserved_char_pad;
 566         __le16  s_desc_size;            /* size of group descriptor */
 567 /*100*/ __le32  s_default_mount_opts;
 568         __le32  s_first_meta_bg;        /* First metablock block group */
 569         __le32  s_mkfs_time;            /* When the filesystem was created */
 570         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 571         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 572 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 573         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 574         __le32  s_free_blocks_count_hi; /* Free blocks count */
 575         __u16   s_min_extra_isize;      /* All inodes have at least # bytes */
 576         __u16   s_want_extra_isize;     /* New inodes should reserve # bytes */
 577         __u32   s_flags;                /* Miscellaneous flags */
 578         __u16   s_raid_stride;          /* RAID stride */
 579         __u16   s_mmp_interval;         /* # seconds to wait in MMP checking */
 580         __u64   s_mmp_block;            /* Block for multi-mount protection */
 581         __u32   s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 582         __u32   s_reserved[163];        /* Padding to the end of the block */
 583 };
 584
 585 #ifdef __KERNEL__
 586 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
 587 {
 588         return sb->s_fs_info;
 589 }
 590 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 591 {
 592         return container_of(inode, struct ext4_inode_info, vfs_inode);
 593 }
 594
 595 static inline struct timespec ext4_current_time(struct inode *inode)
 596 {
 597         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 598                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 599 }
 600
 601
 602 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 603 {
 604         return ino == EXT4_ROOT_INO ||
 605                 ino == EXT4_JOURNAL_INO ||
 606                 ino == EXT4_RESIZE_INO ||
 607                 (ino >= EXT4_FIRST_INO(sb) &&
 608                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 609 }
 610 #else
 611 /* Assume that user mode programs are passing in an ext4fs superblock, not
 612  * a kernel struct super_block.  This will allow us to call the feature-test
 613  * macros from user land. */
 614 #define EXT4_SB(sb)     (sb)
 615 #endif
 616
 617 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 618
 619 /*
 620  * Codes for operating systems
 621  */
 622 #define EXT4_OS_LINUX           0
 623 #define EXT4_OS_HURD            1
 624 #define EXT4_OS_MASIX           2
 625 #define EXT4_OS_FREEBSD         3
 626 #define EXT4_OS_LITES           4
 627
 628 /*
 629  * Revision levels
 630  */
 631 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 632 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 633
 634 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 635 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 636
 637 #define EXT4_GOOD_OLD_INODE_SIZE 128
 638
 639 /*
 640  * Feature set definitions
 641  */
 642
 643 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 644         ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 645 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 646         ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 647 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 648         ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 649 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 650         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 651 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 652         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 653 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 654         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 655 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 656         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 657 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 658         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 659 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 660         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 661
 662 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 663 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 664 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 665 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 666 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 667 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 668
 669 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 670 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 671 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 672 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 673 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 674
 675 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 676 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 677 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 678 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 679 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 680 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 681 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 682
 683 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 684 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 685                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 686                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 687                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 688                                          EXT4_FEATURE_INCOMPAT_64BIT)
 689 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 690                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 691                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 692                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 693                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
 694
 695 /*
 696  * Default values for user and/or group using reserved blocks
 697  */
 698 #define EXT4_DEF_RESUID         0
 699 #define EXT4_DEF_RESGID         0
 700
 701 /*
 702  * Default mount options
 703  */
 704 #define EXT4_DEFM_DEBUG         0x0001
 705 #define EXT4_DEFM_BSDGROUPS     0x0002
 706 #define EXT4_DEFM_XATTR_USER    0x0004
 707 #define EXT4_DEFM_ACL           0x0008
 708 #define EXT4_DEFM_UID16         0x0010
 709 #define EXT4_DEFM_JMODE         0x0060
 710 #define EXT4_DEFM_JMODE_DATA    0x0020
 711 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 712 #define EXT4_DEFM_JMODE_WBACK   0x0060
 713
 714 /*
 715  * Structure of a directory entry
 716  */
 717 #define EXT4_NAME_LEN 255
 718
 719 struct ext4_dir_entry {
 720         __le32  inode;                  /* Inode number */
 721         __le16  rec_len;                /* Directory entry length */
 722         __le16  name_len;               /* Name length */
 723         char    name[EXT4_NAME_LEN];    /* File name */
 724 };
 725
 726 /*
 727  * The new version of the directory entry.  Since EXT4 structures are
 728  * stored in intel byte order, and the name_len field could never be
 729  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 730  * file_type field.
 731  */
 732 struct ext4_dir_entry_2 {
 733         __le32  inode;                  /* Inode number */
 734         __le16  rec_len;                /* Directory entry length */
 735         __u8    name_len;               /* Name length */
 736         __u8    file_type;
 737         char    name[EXT4_NAME_LEN];    /* File name */
 738 };
 739
 740 /*
 741  * Ext4 directory file types.  Only the low 3 bits are used.  The
 742  * other bits are reserved for now.
 743  */
 744 #define EXT4_FT_UNKNOWN         0
 745 #define EXT4_FT_REG_FILE        1
 746 #define EXT4_FT_DIR             2
 747 #define EXT4_FT_CHRDEV          3
 748 #define EXT4_FT_BLKDEV          4
 749 #define EXT4_FT_FIFO            5
 750 #define EXT4_FT_SOCK            6
 751 #define EXT4_FT_SYMLINK         7
 752
 753 #define EXT4_FT_MAX             8
 754
 755 /*
 756  * EXT4_DIR_PAD defines the directory entries boundaries
 757  *
 758  * NOTE: It must be a multiple of 4
 759  */
 760 #define EXT4_DIR_PAD                    4
 761 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 762 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 763                                          ~EXT4_DIR_ROUND)
 764 /*
 765  * Hash Tree Directory indexing
 766  * (c) Daniel Phillips, 2001
 767  */
 768
 769 #ifdef CONFIG_EXT4_INDEX
 770   #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 771                                               EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 772                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 773 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 774 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 775 #else
 776   #define is_dx(dir) 0
 777 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
 778 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
 779 #endif
 780
 781 /* Legal values for the dx_root hash_version field: */
 782
 783 #define DX_HASH_LEGACY          0
 784 #define DX_HASH_HALF_MD4        1
 785 #define DX_HASH_TEA             2
 786
 787 #ifdef __KERNEL__
 788
 789 /* hash info structure used by the directory hash */
 790 struct dx_hash_info
 791 {
 792         u32             hash;
 793         u32             minor_hash;
 794         int             hash_version;
 795         u32             *seed;
 796 };
 797
 798 #define EXT4_HTREE_EOF  0x7fffffff
 799
 800 /*
 801  * Control parameters used by ext4_htree_next_block
 802  */
 803 #define HASH_NB_ALWAYS          1
 804
 805
 806 /*
 807  * Describe an inode's exact location on disk and in memory
 808  */
 809 struct ext4_iloc
 810 {
 811         struct buffer_head *bh;
 812         unsigned long offset;
 813         unsigned long block_group;
 814 };
 815
 816 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 817 {
 818         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 819 }
 820
 821 /*
 822  * This structure is stuffed into the struct file's private_data field
 823  * for directories.  It is where we put information so that we can do
 824  * readdir operations in hash tree order.
 825  */
 826 struct dir_private_info {
 827         struct rb_root  root;
 828         struct rb_node  *curr_node;
 829         struct fname    *extra_fname;
 830         loff_t          last_pos;
 831         __u32           curr_hash;
 832         __u32           curr_minor_hash;
 833         __u32           next_hash;
 834 };
 835
 836 /* calculate the first block number of the group */
 837 static inline ext4_fsblk_t
 838 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
 839 {
 840         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 841                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 842 }
 843
 844 /*
 845  * Special error return code only used by dx_probe() and its callers.
 846  */
 847 #define ERR_BAD_DX_DIR  -75000
 848
 849 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 850                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 851
 852 /*
 853  * Function prototypes
 854  */
 855
 856 /*
 857  * Ok, these declarations are also in <linux/kernel.h> but none of the
 858  * ext4 source programs needs to include it so they are duplicated here.
 859  */
 860 # define NORET_TYPE     /**/
 861 # define ATTRIB_NORET   __attribute__((noreturn))
 862 # define NORET_AND      noreturn,
 863
 864 /* balloc.c */
 865 extern unsigned int ext4_block_group(struct super_block *sb,
 866                         ext4_fsblk_t blocknr);
 867 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 868                         ext4_fsblk_t blocknr);
 869 extern int ext4_bg_has_super(struct super_block *sb, int group);
 870 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
 871 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
 872                         ext4_fsblk_t goal, int *errp);
 873 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
 874                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 875 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
 876                         ext4_fsblk_t block, unsigned long count);
 877 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
 878                                  ext4_fsblk_t block, unsigned long count,
 879                                 unsigned long *pdquot_freed_blocks);
 880 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
 881 extern void ext4_check_blocks_bitmap (struct super_block *);
 882 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
 883                                                     unsigned int block_group,
 884                                                     struct buffer_head ** bh);
 885 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
 886 extern void ext4_init_block_alloc_info(struct inode *);
 887 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
 888
 889 /* dir.c */
 890 extern int ext4_check_dir_entry(const char *, struct inode *,
 891                                 struct ext4_dir_entry_2 *,
 892                                 struct buffer_head *, unsigned long);
 893 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
 894                                     __u32 minor_hash,
 895                                     struct ext4_dir_entry_2 *dirent);
 896 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
 897
 898 /* fsync.c */
 899 extern int ext4_sync_file (struct file *, struct dentry *, int);
 900
 901 /* hash.c */
 902 extern int ext4fs_dirhash(const char *name, int len, struct
 903                           dx_hash_info *hinfo);
 904
 905 /* ialloc.c */
 906 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
 907 extern void ext4_free_inode (handle_t *, struct inode *);
 908 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
 909 extern unsigned long ext4_count_free_inodes (struct super_block *);
 910 extern unsigned long ext4_count_dirs (struct super_block *);
 911 extern void ext4_check_inodes_bitmap (struct super_block *);
 912 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
 913
 914
 915 /* inode.c */
 916 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
 917                 struct buffer_head *bh, ext4_fsblk_t blocknr);
 918 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
 919 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
 920 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
 921         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
 922         int create, int extend_disksize);
 923
 924 extern void ext4_read_inode (struct inode *);
 925 extern int  ext4_write_inode (struct inode *, int);
 926 extern int  ext4_setattr (struct dentry *, struct iattr *);
 927 extern void ext4_delete_inode (struct inode *);
 928 extern int  ext4_sync_inode (handle_t *, struct inode *);
 929 extern void ext4_discard_reservation (struct inode *);
 930 extern void ext4_dirty_inode(struct inode *);
 931 extern int ext4_change_inode_journal_flag(struct inode *, int);
 932 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
 933 extern void ext4_truncate (struct inode *);
 934 extern void ext4_set_inode_flags(struct inode *);
 935 extern void ext4_get_inode_flags(struct ext4_inode_info *);
 936 extern void ext4_set_aops(struct inode *inode);
 937 extern int ext4_writepage_trans_blocks(struct inode *);
 938 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
 939                 struct address_space *mapping, loff_t from);
 940
 941 /* ioctl.c */
 942 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
 943                        unsigned long);
 944 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
 945
 946 /* namei.c */
 947 extern int ext4_orphan_add(handle_t *, struct inode *);
 948 extern int ext4_orphan_del(handle_t *, struct inode *);
 949 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 950                                 __u32 start_minor_hash, __u32 *next_hash);
 951
 952 /* resize.c */
 953 extern int ext4_group_add(struct super_block *sb,
 954                                 struct ext4_new_group_data *input);
 955 extern int ext4_group_extend(struct super_block *sb,
 956                                 struct ext4_super_block *es,
 957                                 ext4_fsblk_t n_blocks_count);
 958
 959 /* super.c */
 960 extern void ext4_error (struct super_block *, const char *, const char *, ...)
 961         __attribute__ ((format (printf, 3, 4)));
 962 extern void __ext4_std_error (struct super_block *, const char *, int);
 963 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
 964         __attribute__ ((format (printf, 3, 4)));
 965 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
 966         __attribute__ ((format (printf, 3, 4)));
 967 extern void ext4_update_dynamic_rev (struct super_block *sb);
 968 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 969                                       struct ext4_group_desc *bg);
 970 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 971                                       struct ext4_group_desc *bg);
 972 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 973                                      struct ext4_group_desc *bg);
 974 extern void ext4_block_bitmap_set(struct super_block *sb,
 975                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
 976 extern void ext4_inode_bitmap_set(struct super_block *sb,
 977                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
 978 extern void ext4_inode_table_set(struct super_block *sb,
 979                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
 980
 981 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
 982 {
 983         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
 984                 le32_to_cpu(es->s_blocks_count);
 985 }
 986
 987 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
 988 {
 989         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
 990                 le32_to_cpu(es->s_r_blocks_count);
 991 }
 992
 993 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
 994 {
 995         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
 996                 le32_to_cpu(es->s_free_blocks_count);
 997 }
 998
 999 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1000                                          ext4_fsblk_t blk)
1001 {
1002         es->s_blocks_count = cpu_to_le32((u32)blk);
1003         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1004 }
1005
1006 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1007                                               ext4_fsblk_t blk)
1008 {
1009         es->s_free_blocks_count = cpu_to_le32((u32)blk);
1010         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1011 }
1012
1013 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1014                                            ext4_fsblk_t blk)
1015 {
1016         es->s_r_blocks_count = cpu_to_le32((u32)blk);
1017         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1018 }
1019
1020
1021
1022 #define ext4_std_error(sb, errno)                               \
1023 do {                                                            \
1024         if ((errno))                                            \
1025                 __ext4_std_error((sb), __FUNCTION__, (errno));  \
1026 } while (0)
1027
1028 /*
1029  * Inodes and files operations
1030  */
1031
1032 /* dir.c */
1033 extern const struct file_operations ext4_dir_operations;
1034
1035 /* file.c */
1036 extern const struct inode_operations ext4_file_inode_operations;
1037 extern const struct file_operations ext4_file_operations;
1038
1039 /* namei.c */
1040 extern const struct inode_operations ext4_dir_inode_operations;
1041 extern const struct inode_operations ext4_special_inode_operations;
1042
1043 /* symlink.c */
1044 extern const struct inode_operations ext4_symlink_inode_operations;
1045 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1046
1047 /* extents.c */
1048 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1049 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1050 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1051                         ext4_fsblk_t iblock,
1052                         unsigned long max_blocks, struct buffer_head *bh_result,
1053                         int create, int extend_disksize);
1054 extern void ext4_ext_truncate(struct inode *, struct page *);
1055 extern void ext4_ext_init(struct super_block *);
1056 extern void ext4_ext_release(struct super_block *);
1057 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1058                           loff_t len);
1059 static inline int
1060 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1061                         unsigned long max_blocks, struct buffer_head *bh,
1062                         int create, int extend_disksize)
1063 {
1064         if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
1065                 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
1066                                         bh, create, extend_disksize);
1067         return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
1068                                         create, extend_disksize);
1069 }
1070
1071
1072 #endif  /* __KERNEL__ */
1073
1074 #endif  /* _LINUX_EXT4_FS_H */