include/linux/ext4_fs.h

   1 /*
   2  *  linux/include/linux/ext4_fs.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _LINUX_EXT4_FS_H
  17 #define _LINUX_EXT4_FS_H
  18
  19 #include <linux/types.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/magic.h>
  22
  23 /*
  24  * The second extended filesystem constants/structures
  25  */
  26
  27 /*
  28  * Define EXT4FS_DEBUG to produce debug messages
  29  */
  30 #undef EXT4FS_DEBUG
  31
  32 /*
  33  * Define EXT4_RESERVATION to reserve data blocks for expanding files
  34  */
  35 #define EXT4_DEFAULT_RESERVE_BLOCKS     8
  36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  37 #define EXT4_MAX_RESERVE_BLOCKS         1027
  38 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
  39
  40 /*
  41  * Debug code
  42  */
  43 #ifdef EXT4FS_DEBUG
  44 #define ext4_debug(f, a...)                                             \
  45         do {                                                            \
  46                 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",       \
  47                         __FILE__, __LINE__, __FUNCTION__);              \
  48                 printk (KERN_DEBUG f, ## a);                            \
  49         } while (0)
  50 #else
  51 #define ext4_debug(f, a...)     do {} while (0)
  52 #endif
  53
  54 /*
  55  * Special inodes numbers
  56  */
  57 #define EXT4_BAD_INO             1      /* Bad blocks inode */
  58 #define EXT4_ROOT_INO            2      /* Root inode */
  59 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
  60 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
  61 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
  62 #define EXT4_JOURNAL_INO         8      /* Journal inode */
  63
  64 /* First non-reserved inode for old ext4 filesystems */
  65 #define EXT4_GOOD_OLD_FIRST_INO 11
  66
  67 /*
  68  * Maximal count of links to a file
  69  */
  70 #define EXT4_LINK_MAX           65000
  71
  72 /*
  73  * Macro-instructions used to manage several block sizes
  74  */
  75 #define EXT4_MIN_BLOCK_SIZE             1024
  76 #define EXT4_MAX_BLOCK_SIZE             65536
  77 #define EXT4_MIN_BLOCK_LOG_SIZE         10
  78 #ifdef __KERNEL__
  79 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
  80 #else
  81 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  82 #endif
  83 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
  84 #ifdef __KERNEL__
  85 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  86 #else
  87 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  88 #endif
  89 #ifdef __KERNEL__
  90 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
  91 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
  92 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
  93 #else
  94 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
  95                                  EXT4_GOOD_OLD_INODE_SIZE : \
  96                                  (s)->s_inode_size)
  97 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
  98                                  EXT4_GOOD_OLD_FIRST_INO : \
  99                                  (s)->s_first_ino)
 100 #endif
 101 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 102
 103 /*
 104  * Structure of a blocks group descriptor
 105  */
 106 struct ext4_group_desc
 107 {
 108         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 109         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 110         __le32  bg_inode_table_lo;      /* Inodes table block */
 111         __le16  bg_free_blocks_count;   /* Free blocks count */
 112         __le16  bg_free_inodes_count;   /* Free inodes count */
 113         __le16  bg_used_dirs_count;     /* Directories count */
 114         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 115         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 116         __le16  bg_itable_unused;       /* Unused inodes count */
 117         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 118         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 119         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 120         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 121 };
 122
 123 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 124 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 125 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 126
 127 #ifdef __KERNEL__
 128 #include <linux/ext4_fs_i.h>
 129 #include <linux/ext4_fs_sb.h>
 130 #endif
 131 /*
 132  * Macro-instructions used to manage group descriptors
 133  */
 134 #define EXT4_MIN_DESC_SIZE              32
 135 #define EXT4_MIN_DESC_SIZE_64BIT        64
 136 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 137 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 138 #ifdef __KERNEL__
 139 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 140 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 141 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 142 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 143 #else
 144 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 145 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 146 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 147 #endif
 148
 149 /*
 150  * Constants relative to the data blocks
 151  */
 152 #define EXT4_NDIR_BLOCKS                12
 153 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 154 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 155 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 156 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 157
 158 /*
 159  * Inode flags
 160  */
 161 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 162 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 163 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 164 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 165 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 166 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 167 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 168 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 169 /* Reserved for compression usage... */
 170 #define EXT4_DIRTY_FL                   0x00000100
 171 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 172 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 173 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 174 /* End compression flags --- maybe not all used */
 175 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 176 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 177 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 178 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 179 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 180 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 181 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 182 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 183 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 184
 185 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 186 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 187
 188 /*
 189  * Inode dynamic state flags
 190  */
 191 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 192 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 193 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 194 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 195
 196 /* Used to pass group descriptor data when online resize is done */
 197 struct ext4_new_group_input {
 198         __u32 group;            /* Group number for this data */
 199         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 200         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 201         __u64 inode_table;      /* Absolute block number of inode table start */
 202         __u32 blocks_count;     /* Total number of blocks in this group */
 203         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 204         __u16 unused;
 205 };
 206
 207 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 208 struct ext4_new_group_data {
 209         __u32 group;
 210         __u64 block_bitmap;
 211         __u64 inode_bitmap;
 212         __u64 inode_table;
 213         __u32 blocks_count;
 214         __u16 reserved_blocks;
 215         __u16 unused;
 216         __u32 free_blocks_count;
 217 };
 218
 219 /*
 220  * Following is used by preallocation code to tell get_blocks() that we
 221  * want uninitialzed extents.
 222  */
 223 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 224
 225 /*
 226  * ioctl commands
 227  */
 228 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 229 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 230 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 231 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 232 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 233 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
 234 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 235 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 236 #ifdef CONFIG_JBD2_DEBUG
 237 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 238 #endif
 239 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 240 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 241
 242 /*
 243  * ioctl commands in 32 bit emulation
 244  */
 245 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 246 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 247 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 248 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 249 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 250 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 251 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 252 #ifdef CONFIG_JBD2_DEBUG
 253 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 254 #endif
 255 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 256 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 257
 258
 259 /*
 260  *  Mount options
 261  */
 262 struct ext4_mount_options {
 263         unsigned long s_mount_opt;
 264         uid_t s_resuid;
 265         gid_t s_resgid;
 266         unsigned long s_commit_interval;
 267 #ifdef CONFIG_QUOTA
 268         int s_jquota_fmt;
 269         char *s_qf_names[MAXQUOTAS];
 270 #endif
 271 };
 272
 273 /*
 274  * Structure of an inode on the disk
 275  */
 276 struct ext4_inode {
 277         __le16  i_mode;         /* File mode */
 278         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 279         __le32  i_size_lo;      /* Size in bytes */
 280         __le32  i_atime;        /* Access time */
 281         __le32  i_ctime;        /* Inode Change time */
 282         __le32  i_mtime;        /* Modification time */
 283         __le32  i_dtime;        /* Deletion Time */
 284         __le16  i_gid;          /* Low 16 bits of Group Id */
 285         __le16  i_links_count;  /* Links count */
 286         __le32  i_blocks_lo;    /* Blocks count */
 287         __le32  i_flags;        /* File flags */
 288         union {
 289                 struct {
 290                         __u32  l_i_reserved1;
 291                 } linux1;
 292                 struct {
 293                         __u32  h_i_translator;
 294                 } hurd1;
 295                 struct {
 296                         __u32  m_i_reserved1;
 297                 } masix1;
 298         } osd1;                         /* OS dependent 1 */
 299         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 300         __le32  i_generation;   /* File version (for NFS) */
 301         __le32  i_file_acl_lo;  /* File ACL */
 302         __le32  i_size_high;
 303         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 304         union {
 305                 struct {
 306                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 307                         __le16  l_i_file_acl_high;
 308                         __le16  l_i_uid_high;   /* these 2 fields */
 309                         __le16  l_i_gid_high;   /* were reserved2[0] */
 310                         __u32   l_i_reserved2;
 311                 } linux2;
 312                 struct {
 313                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 314                         __u16   h_i_mode_high;
 315                         __u16   h_i_uid_high;
 316                         __u16   h_i_gid_high;
 317                         __u32   h_i_author;
 318                 } hurd2;
 319                 struct {
 320                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 321                         __le16  m_i_file_acl_high;
 322                         __u32   m_i_reserved2[2];
 323                 } masix2;
 324         } osd2;                         /* OS dependent 2 */
 325         __le16  i_extra_isize;
 326         __le16  i_pad1;
 327         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 328         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 329         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 330         __le32  i_crtime;       /* File Creation time */
 331         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 332 };
 333
 334
 335 #define EXT4_EPOCH_BITS 2
 336 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 337 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 338
 339 /*
 340  * Extended fields will fit into an inode if the filesystem was formatted
 341  * with large inodes (-I 256 or larger) and there are not currently any EAs
 342  * consuming all of the available space. For new inodes we always reserve
 343  * enough space for the kernel's known extended fields, but for inodes
 344  * created with an old kernel this might not have been the case. None of
 345  * the extended inode fields is critical for correct filesystem operation.
 346  * This macro checks if a certain field fits in the inode. Note that
 347  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 348  */
 349 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 350         ((offsetof(typeof(*ext4_inode), field) +        \
 351           sizeof((ext4_inode)->field))                  \
 352         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 353             (einode)->i_extra_isize))                   \
 354
 355 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 356 {
 357        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 358                            time->tv_sec >> 32 : 0) |
 359                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 360 }
 361
 362 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 363 {
 364        if (sizeof(time->tv_sec) > 4)
 365                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 366                                << 32;
 367        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 368 }
 369
 370 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 371 do {                                                                           \
 372         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 373         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 374                 (raw_inode)->xtime ## _extra =                                 \
 375                                 ext4_encode_extra_time(&(inode)->xtime);       \
 376 } while (0)
 377
 378 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 379 do {                                                                           \
 380         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 381                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 382         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 383                 (raw_inode)->xtime ## _extra =                                 \
 384                                 ext4_encode_extra_time(&(einode)->xtime);      \
 385 } while (0)
 386
 387 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 388 do {                                                                           \
 389         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 390         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 391                 ext4_decode_extra_time(&(inode)->xtime,                        \
 392                                        raw_inode->xtime ## _extra);            \
 393 } while (0)
 394
 395 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 396 do {                                                                           \
 397         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 398                 (einode)->xtime.tv_sec =                                       \
 399                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 400         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 401                 ext4_decode_extra_time(&(einode)->xtime,                       \
 402                                        raw_inode->xtime ## _extra);            \
 403 } while (0)
 404
 405 #if defined(__KERNEL__) || defined(__linux__)
 406 #define i_reserved1     osd1.linux1.l_i_reserved1
 407 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 408 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 409 #define i_uid_low       i_uid
 410 #define i_gid_low       i_gid
 411 #define i_uid_high      osd2.linux2.l_i_uid_high
 412 #define i_gid_high      osd2.linux2.l_i_gid_high
 413 #define i_reserved2     osd2.linux2.l_i_reserved2
 414
 415 #elif defined(__GNU__)
 416
 417 #define i_translator    osd1.hurd1.h_i_translator
 418 #define i_uid_high      osd2.hurd2.h_i_uid_high
 419 #define i_gid_high      osd2.hurd2.h_i_gid_high
 420 #define i_author        osd2.hurd2.h_i_author
 421
 422 #elif defined(__masix__)
 423
 424 #define i_reserved1     osd1.masix1.m_i_reserved1
 425 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 426 #define i_reserved2     osd2.masix2.m_i_reserved2
 427
 428 #endif /* defined(__KERNEL__) || defined(__linux__) */
 429
 430 /*
 431  * File system states
 432  */
 433 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 434 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 435 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 436
 437 /*
 438  * Mount flags
 439  */
 440 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 441 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 442 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 443 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 444 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 445 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 446 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 447 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 448 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 449 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 450 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 451 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 452 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 453 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 454 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 455 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 456 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 457 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 458 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 459 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 460 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 461 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 462 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 463 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 464 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
 465
 466 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 467 #ifndef _LINUX_EXT2_FS_H
 468 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 469 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 470 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 471                                          EXT4_MOUNT_##opt)
 472 #else
 473 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 474 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 475 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 476 #endif
 477
 478 #define ext4_set_bit                    ext2_set_bit
 479 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 480 #define ext4_clear_bit                  ext2_clear_bit
 481 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 482 #define ext4_test_bit                   ext2_test_bit
 483 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 484 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 485
 486 /*
 487  * Maximal mount counts between two filesystem checks
 488  */
 489 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 490 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 491
 492 /*
 493  * Behaviour when detecting errors
 494  */
 495 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 496 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 497 #define EXT4_ERRORS_PANIC               3       /* Panic */
 498 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 499
 500 /*
 501  * Structure of the super block
 502  */
 503 struct ext4_super_block {
 504 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 505         __le32  s_blocks_count_lo;      /* Blocks count */
 506         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 507         __le32  s_free_blocks_count_lo; /* Free blocks count */
 508 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 509         __le32  s_first_data_block;     /* First Data Block */
 510         __le32  s_log_block_size;       /* Block size */
 511         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 512 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 513         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 514         __le32  s_inodes_per_group;     /* # Inodes per group */
 515         __le32  s_mtime;                /* Mount time */
 516 /*30*/  __le32  s_wtime;                /* Write time */
 517         __le16  s_mnt_count;            /* Mount count */
 518         __le16  s_max_mnt_count;        /* Maximal mount count */
 519         __le16  s_magic;                /* Magic signature */
 520         __le16  s_state;                /* File system state */
 521         __le16  s_errors;               /* Behaviour when detecting errors */
 522         __le16  s_minor_rev_level;      /* minor revision level */
 523 /*40*/  __le32  s_lastcheck;            /* time of last check */
 524         __le32  s_checkinterval;        /* max. time between checks */
 525         __le32  s_creator_os;           /* OS */
 526         __le32  s_rev_level;            /* Revision level */
 527 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 528         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 529         /*
 530          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 531          *
 532          * Note: the difference between the compatible feature set and
 533          * the incompatible feature set is that if there is a bit set
 534          * in the incompatible feature set that the kernel doesn't
 535          * know about, it should refuse to mount the filesystem.
 536          *
 537          * e2fsck's requirements are more strict; if it doesn't know
 538          * about a feature in either the compatible or incompatible
 539          * feature set, it must abort and not try to meddle with
 540          * things it doesn't understand...
 541          */
 542         __le32  s_first_ino;            /* First non-reserved inode */
 543         __le16  s_inode_size;           /* size of inode structure */
 544         __le16  s_block_group_nr;       /* block group # of this superblock */
 545         __le32  s_feature_compat;       /* compatible feature set */
 546 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 547         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 548 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 549 /*78*/  char    s_volume_name[16];      /* volume name */
 550 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 551 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 552         /*
 553          * Performance hints.  Directory preallocation should only
 554          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 555          */
 556         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 557         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 558         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 559         /*
 560          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 561          */
 562 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 563 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 564         __le32  s_journal_dev;          /* device number of journal file */
 565         __le32  s_last_orphan;          /* start of list of inodes to delete */
 566         __le32  s_hash_seed[4];         /* HTREE hash seed */
 567         __u8    s_def_hash_version;     /* Default hash version to use */
 568         __u8    s_reserved_char_pad;
 569         __le16  s_desc_size;            /* size of group descriptor */
 570 /*100*/ __le32  s_default_mount_opts;
 571         __le32  s_first_meta_bg;        /* First metablock block group */
 572         __le32  s_mkfs_time;            /* When the filesystem was created */
 573         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 574         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 575 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 576         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 577         __le32  s_free_blocks_count_hi; /* Free blocks count */
 578         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 579         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 580         __le32  s_flags;                /* Miscellaneous flags */
 581         __le16  s_raid_stride;          /* RAID stride */
 582         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 583         __le64  s_mmp_block;            /* Block for multi-mount protection */
 584         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 585         __u32   s_reserved[163];        /* Padding to the end of the block */
 586 };
 587
 588 #ifdef __KERNEL__
 589 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
 590 {
 591         return sb->s_fs_info;
 592 }
 593 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 594 {
 595         return container_of(inode, struct ext4_inode_info, vfs_inode);
 596 }
 597
 598 static inline struct timespec ext4_current_time(struct inode *inode)
 599 {
 600         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 601                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 602 }
 603
 604
 605 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 606 {
 607         return ino == EXT4_ROOT_INO ||
 608                 ino == EXT4_JOURNAL_INO ||
 609                 ino == EXT4_RESIZE_INO ||
 610                 (ino >= EXT4_FIRST_INO(sb) &&
 611                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 612 }
 613 #else
 614 /* Assume that user mode programs are passing in an ext4fs superblock, not
 615  * a kernel struct super_block.  This will allow us to call the feature-test
 616  * macros from user land. */
 617 #define EXT4_SB(sb)     (sb)
 618 #endif
 619
 620 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 621
 622 /*
 623  * Codes for operating systems
 624  */
 625 #define EXT4_OS_LINUX           0
 626 #define EXT4_OS_HURD            1
 627 #define EXT4_OS_MASIX           2
 628 #define EXT4_OS_FREEBSD         3
 629 #define EXT4_OS_LITES           4
 630
 631 /*
 632  * Revision levels
 633  */
 634 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 635 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 636
 637 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 638 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 639
 640 #define EXT4_GOOD_OLD_INODE_SIZE 128
 641
 642 /*
 643  * Feature set definitions
 644  */
 645
 646 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 647         ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 648 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 649         ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 650 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 651         ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 652 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 653         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 654 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 655         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 656 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 657         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 658 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 659         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 660 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 661         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 662 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 663         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 664
 665 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 666 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 667 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 668 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 669 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 670 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 671
 672 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 673 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 674 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 675 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 676 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 677 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 678 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 679
 680 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 681 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 682 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 683 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 684 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 685 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 686 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 687 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 688 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 689
 690 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 691 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 692                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 693                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 694                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 695                                          EXT4_FEATURE_INCOMPAT_64BIT| \
 696                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
 697 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 698                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 699                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
 700                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 701                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 702                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
 703                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 704
 705 /*
 706  * Default values for user and/or group using reserved blocks
 707  */
 708 #define EXT4_DEF_RESUID         0
 709 #define EXT4_DEF_RESGID         0
 710
 711 /*
 712  * Default mount options
 713  */
 714 #define EXT4_DEFM_DEBUG         0x0001
 715 #define EXT4_DEFM_BSDGROUPS     0x0002
 716 #define EXT4_DEFM_XATTR_USER    0x0004
 717 #define EXT4_DEFM_ACL           0x0008
 718 #define EXT4_DEFM_UID16         0x0010
 719 #define EXT4_DEFM_JMODE         0x0060
 720 #define EXT4_DEFM_JMODE_DATA    0x0020
 721 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 722 #define EXT4_DEFM_JMODE_WBACK   0x0060
 723
 724 /*
 725  * Structure of a directory entry
 726  */
 727 #define EXT4_NAME_LEN 255
 728
 729 struct ext4_dir_entry {
 730         __le32  inode;                  /* Inode number */
 731         __le16  rec_len;                /* Directory entry length */
 732         __le16  name_len;               /* Name length */
 733         char    name[EXT4_NAME_LEN];    /* File name */
 734 };
 735
 736 /*
 737  * The new version of the directory entry.  Since EXT4 structures are
 738  * stored in intel byte order, and the name_len field could never be
 739  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 740  * file_type field.
 741  */
 742 struct ext4_dir_entry_2 {
 743         __le32  inode;                  /* Inode number */
 744         __le16  rec_len;                /* Directory entry length */
 745         __u8    name_len;               /* Name length */
 746         __u8    file_type;
 747         char    name[EXT4_NAME_LEN];    /* File name */
 748 };
 749
 750 /*
 751  * Ext4 directory file types.  Only the low 3 bits are used.  The
 752  * other bits are reserved for now.
 753  */
 754 #define EXT4_FT_UNKNOWN         0
 755 #define EXT4_FT_REG_FILE        1
 756 #define EXT4_FT_DIR             2
 757 #define EXT4_FT_CHRDEV          3
 758 #define EXT4_FT_BLKDEV          4
 759 #define EXT4_FT_FIFO            5
 760 #define EXT4_FT_SOCK            6
 761 #define EXT4_FT_SYMLINK         7
 762
 763 #define EXT4_FT_MAX             8
 764
 765 /*
 766  * EXT4_DIR_PAD defines the directory entries boundaries
 767  *
 768  * NOTE: It must be a multiple of 4
 769  */
 770 #define EXT4_DIR_PAD                    4
 771 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 772 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 773                                          ~EXT4_DIR_ROUND)
 774 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
 775
 776 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
 777 {
 778         unsigned len = le16_to_cpu(dlen);
 779
 780         if (len == EXT4_MAX_REC_LEN)
 781                 return 1 << 16;
 782         return len;
 783 }
 784
 785 static inline __le16 ext4_rec_len_to_disk(unsigned len)
 786 {
 787         if (len == (1 << 16))
 788                 return cpu_to_le16(EXT4_MAX_REC_LEN);
 789         else if (len > (1 << 16))
 790                 BUG();
 791         return cpu_to_le16(len);
 792 }
 793
 794 /*
 795  * Hash Tree Directory indexing
 796  * (c) Daniel Phillips, 2001
 797  */
 798
 799 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 800                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 801                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 802 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 803 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 804
 805 /* Legal values for the dx_root hash_version field: */
 806
 807 #define DX_HASH_LEGACY          0
 808 #define DX_HASH_HALF_MD4        1
 809 #define DX_HASH_TEA             2
 810
 811 #ifdef __KERNEL__
 812
 813 /* hash info structure used by the directory hash */
 814 struct dx_hash_info
 815 {
 816         u32             hash;
 817         u32             minor_hash;
 818         int             hash_version;
 819         u32             *seed;
 820 };
 821
 822 #define EXT4_HTREE_EOF  0x7fffffff
 823
 824 /*
 825  * Control parameters used by ext4_htree_next_block
 826  */
 827 #define HASH_NB_ALWAYS          1
 828
 829
 830 /*
 831  * Describe an inode's exact location on disk and in memory
 832  */
 833 struct ext4_iloc
 834 {
 835         struct buffer_head *bh;
 836         unsigned long offset;
 837         ext4_group_t block_group;
 838 };
 839
 840 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 841 {
 842         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 843 }
 844
 845 /*
 846  * This structure is stuffed into the struct file's private_data field
 847  * for directories.  It is where we put information so that we can do
 848  * readdir operations in hash tree order.
 849  */
 850 struct dir_private_info {
 851         struct rb_root  root;
 852         struct rb_node  *curr_node;
 853         struct fname    *extra_fname;
 854         loff_t          last_pos;
 855         __u32           curr_hash;
 856         __u32           curr_minor_hash;
 857         __u32           next_hash;
 858 };
 859
 860 /* calculate the first block number of the group */
 861 static inline ext4_fsblk_t
 862 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
 863 {
 864         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 865                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 866 }
 867
 868 /*
 869  * Special error return code only used by dx_probe() and its callers.
 870  */
 871 #define ERR_BAD_DX_DIR  -75000
 872
 873 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 874                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 875
 876 /*
 877  * Function prototypes
 878  */
 879
 880 /*
 881  * Ok, these declarations are also in <linux/kernel.h> but none of the
 882  * ext4 source programs needs to include it so they are duplicated here.
 883  */
 884 # define NORET_TYPE     /**/
 885 # define ATTRIB_NORET   __attribute__((noreturn))
 886 # define NORET_AND      noreturn,
 887
 888 /* balloc.c */
 889 extern unsigned int ext4_block_group(struct super_block *sb,
 890                         ext4_fsblk_t blocknr);
 891 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 892                         ext4_fsblk_t blocknr);
 893 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
 894 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
 895                         ext4_group_t group);
 896 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
 897                         ext4_fsblk_t goal, int *errp);
 898 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
 899                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 900 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
 901                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 902 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
 903                         ext4_fsblk_t block, unsigned long count);
 904 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
 905                                  ext4_fsblk_t block, unsigned long count,
 906                                 unsigned long *pdquot_freed_blocks);
 907 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
 908 extern void ext4_check_blocks_bitmap (struct super_block *);
 909 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
 910                                                     ext4_group_t block_group,
 911                                                     struct buffer_head ** bh);
 912 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
 913 extern void ext4_init_block_alloc_info(struct inode *);
 914 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
 915
 916 /* dir.c */
 917 extern int ext4_check_dir_entry(const char *, struct inode *,
 918                                 struct ext4_dir_entry_2 *,
 919                                 struct buffer_head *, unsigned long);
 920 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
 921                                     __u32 minor_hash,
 922                                     struct ext4_dir_entry_2 *dirent);
 923 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
 924
 925 /* fsync.c */
 926 extern int ext4_sync_file (struct file *, struct dentry *, int);
 927
 928 /* hash.c */
 929 extern int ext4fs_dirhash(const char *name, int len, struct
 930                           dx_hash_info *hinfo);
 931
 932 /* ialloc.c */
 933 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
 934 extern void ext4_free_inode (handle_t *, struct inode *);
 935 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
 936 extern unsigned long ext4_count_free_inodes (struct super_block *);
 937 extern unsigned long ext4_count_dirs (struct super_block *);
 938 extern void ext4_check_inodes_bitmap (struct super_block *);
 939 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
 940
 941
 942 /* inode.c */
 943 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
 944                 struct buffer_head *bh, ext4_fsblk_t blocknr);
 945 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
 946                                                 ext4_lblk_t, int, int *);
 947 struct buffer_head *ext4_bread(handle_t *, struct inode *,
 948                                                 ext4_lblk_t, int, int *);
 949 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
 950                                 ext4_lblk_t iblock, unsigned long maxblocks,
 951                                 struct buffer_head *bh_result,
 952                                 int create, int extend_disksize);
 953
 954 extern void ext4_read_inode (struct inode *);
 955 extern int  ext4_write_inode (struct inode *, int);
 956 extern int  ext4_setattr (struct dentry *, struct iattr *);
 957 extern void ext4_delete_inode (struct inode *);
 958 extern int  ext4_sync_inode (handle_t *, struct inode *);
 959 extern void ext4_discard_reservation (struct inode *);
 960 extern void ext4_dirty_inode(struct inode *);
 961 extern int ext4_change_inode_journal_flag(struct inode *, int);
 962 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
 963 extern void ext4_truncate (struct inode *);
 964 extern void ext4_set_inode_flags(struct inode *);
 965 extern void ext4_get_inode_flags(struct ext4_inode_info *);
 966 extern void ext4_set_aops(struct inode *inode);
 967 extern int ext4_writepage_trans_blocks(struct inode *);
 968 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
 969                 struct address_space *mapping, loff_t from);
 970
 971 /* ioctl.c */
 972 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
 973                        unsigned long);
 974 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
 975
 976 /* namei.c */
 977 extern int ext4_orphan_add(handle_t *, struct inode *);
 978 extern int ext4_orphan_del(handle_t *, struct inode *);
 979 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 980                                 __u32 start_minor_hash, __u32 *next_hash);
 981
 982 /* resize.c */
 983 extern int ext4_group_add(struct super_block *sb,
 984                                 struct ext4_new_group_data *input);
 985 extern int ext4_group_extend(struct super_block *sb,
 986                                 struct ext4_super_block *es,
 987                                 ext4_fsblk_t n_blocks_count);
 988
 989 /* super.c */
 990 extern void ext4_error (struct super_block *, const char *, const char *, ...)
 991         __attribute__ ((format (printf, 3, 4)));
 992 extern void __ext4_std_error (struct super_block *, const char *, int);
 993 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
 994         __attribute__ ((format (printf, 3, 4)));
 995 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
 996         __attribute__ ((format (printf, 3, 4)));
 997 extern void ext4_update_dynamic_rev (struct super_block *sb);
 998 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
 999                                         __u32 compat);
1000 extern int ext4_update_rocompat_feature(handle_t *handle,
1001                                         struct super_block *sb, __u32 rocompat);
1002 extern int ext4_update_incompat_feature(handle_t *handle,
1003                                         struct super_block *sb, __u32 incompat);
1004 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1005                                       struct ext4_group_desc *bg);
1006 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1007                                       struct ext4_group_desc *bg);
1008 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1009                                      struct ext4_group_desc *bg);
1010 extern void ext4_block_bitmap_set(struct super_block *sb,
1011                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1012 extern void ext4_inode_bitmap_set(struct super_block *sb,
1013                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1014 extern void ext4_inode_table_set(struct super_block *sb,
1015                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1016
1017 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1018 {
1019         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1020                 le32_to_cpu(es->s_blocks_count_lo);
1021 }
1022
1023 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1024 {
1025         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1026                 le32_to_cpu(es->s_r_blocks_count_lo);
1027 }
1028
1029 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1030 {
1031         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1032                 le32_to_cpu(es->s_free_blocks_count_lo);
1033 }
1034
1035 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1036                                          ext4_fsblk_t blk)
1037 {
1038         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1039         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1040 }
1041
1042 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1043                                               ext4_fsblk_t blk)
1044 {
1045         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1046         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1047 }
1048
1049 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1050                                            ext4_fsblk_t blk)
1051 {
1052         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1053         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1054 }
1055
1056 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1057 {
1058         return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1059                 le32_to_cpu(raw_inode->i_size_lo);
1060 }
1061
1062 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1063 {
1064         raw_inode->i_size_lo = cpu_to_le32(i_size);
1065         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1066 }
1067
1068 #define ext4_std_error(sb, errno)                               \
1069 do {                                                            \
1070         if ((errno))                                            \
1071                 __ext4_std_error((sb), __FUNCTION__, (errno));  \
1072 } while (0)
1073
1074 /*
1075  * Inodes and files operations
1076  */
1077
1078 /* dir.c */
1079 extern const struct file_operations ext4_dir_operations;
1080
1081 /* file.c */
1082 extern const struct inode_operations ext4_file_inode_operations;
1083 extern const struct file_operations ext4_file_operations;
1084
1085 /* namei.c */
1086 extern const struct inode_operations ext4_dir_inode_operations;
1087 extern const struct inode_operations ext4_special_inode_operations;
1088
1089 /* symlink.c */
1090 extern const struct inode_operations ext4_symlink_inode_operations;
1091 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1092
1093 /* extents.c */
1094 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1095 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1096 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1097                         ext4_lblk_t iblock,
1098                         unsigned long max_blocks, struct buffer_head *bh_result,
1099                         int create, int extend_disksize);
1100 extern void ext4_ext_truncate(struct inode *, struct page *);
1101 extern void ext4_ext_init(struct super_block *);
1102 extern void ext4_ext_release(struct super_block *);
1103 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1104                           loff_t len);
1105 static inline int
1106 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1107                         unsigned long max_blocks, struct buffer_head *bh,
1108                         int create, int extend_disksize)
1109 {
1110         int retval;
1111         if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
1112                 retval = ext4_ext_get_blocks(handle, inode,
1113                                                 (ext4_lblk_t)block, max_blocks,
1114                                                 bh, create, extend_disksize);
1115         } else {
1116                 retval = ext4_get_blocks_handle(handle, inode,
1117                                                 (ext4_lblk_t)block, max_blocks,
1118                                                 bh, create, extend_disksize);
1119         }
1120         return retval;
1121 }
1122
1123
1124 #endif  /* __KERNEL__ */
1125
1126 #endif  /* _LINUX_EXT4_FS_H */