fs/ext4/ext4.h

   1 /*
   2  *  ext4.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 _EXT4_H
  17 #define _EXT4_H
  18
  19 #include <linux/types.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/magic.h>
  22 #include "ext4_i.h"
  23
  24 /*
  25  * The second extended filesystem constants/structures
  26  */
  27
  28 /*
  29  * Define EXT4FS_DEBUG to produce debug messages
  30  */
  31 #undef EXT4FS_DEBUG
  32
  33 /*
  34  * Define EXT4_RESERVATION to reserve data blocks for expanding files
  35  */
  36 #define EXT4_DEFAULT_RESERVE_BLOCKS     8
  37 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  38 #define EXT4_MAX_RESERVE_BLOCKS         1027
  39 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
  40
  41 /*
  42  * Debug code
  43  */
  44 #ifdef EXT4FS_DEBUG
  45 #define ext4_debug(f, a...)                                             \
  46         do {                                                            \
  47                 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",       \
  48                         __FILE__, __LINE__, __FUNCTION__);              \
  49                 printk (KERN_DEBUG f, ## a);                            \
  50         } while (0)
  51 #else
  52 #define ext4_debug(f, a...)     do {} while (0)
  53 #endif
  54
  55 #define EXT4_MULTIBLOCK_ALLOCATOR       1
  56
  57 /* prefer goal again. length */
  58 #define EXT4_MB_HINT_MERGE              1
  59 /* blocks already reserved */
  60 #define EXT4_MB_HINT_RESERVED           2
  61 /* metadata is being allocated */
  62 #define EXT4_MB_HINT_METADATA           4
  63 /* first blocks in the file */
  64 #define EXT4_MB_HINT_FIRST              8
  65 /* search for the best chunk */
  66 #define EXT4_MB_HINT_BEST               16
  67 /* data is being allocated */
  68 #define EXT4_MB_HINT_DATA               32
  69 /* don't preallocate (for tails) */
  70 #define EXT4_MB_HINT_NOPREALLOC         64
  71 /* allocate for locality group */
  72 #define EXT4_MB_HINT_GROUP_ALLOC        128
  73 /* allocate goal blocks or none */
  74 #define EXT4_MB_HINT_GOAL_ONLY          256
  75 /* goal is meaningful */
  76 #define EXT4_MB_HINT_TRY_GOAL           512
  77
  78 struct ext4_allocation_request {
  79         /* target inode for block we're allocating */
  80         struct inode *inode;
  81         /* logical block in target inode */
  82         ext4_lblk_t logical;
  83         /* phys. target (a hint) */
  84         ext4_fsblk_t goal;
  85         /* the closest logical allocated block to the left */
  86         ext4_lblk_t lleft;
  87         /* phys. block for ^^^ */
  88         ext4_fsblk_t pleft;
  89         /* the closest logical allocated block to the right */
  90         ext4_lblk_t lright;
  91         /* phys. block for ^^^ */
  92         ext4_fsblk_t pright;
  93         /* how many blocks we want to allocate */
  94         unsigned long len;
  95         /* flags. see above EXT4_MB_HINT_* */
  96         unsigned long flags;
  97 };
  98
  99 /*
 100  * Special inodes numbers
 101  */
 102 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 103 #define EXT4_ROOT_INO            2      /* Root inode */
 104 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 105 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 106 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 107 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 108
 109 /* First non-reserved inode for old ext4 filesystems */
 110 #define EXT4_GOOD_OLD_FIRST_INO 11
 111
 112 /*
 113  * Maximal count of links to a file
 114  */
 115 #define EXT4_LINK_MAX           65000
 116
 117 /*
 118  * Macro-instructions used to manage several block sizes
 119  */
 120 #define EXT4_MIN_BLOCK_SIZE             1024
 121 #define EXT4_MAX_BLOCK_SIZE             65536
 122 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 123 #ifdef __KERNEL__
 124 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 125 #else
 126 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 127 #endif
 128 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
 129 #ifdef __KERNEL__
 130 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 131 #else
 132 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 133 #endif
 134 #ifdef __KERNEL__
 135 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 136 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 137 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 138 #else
 139 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 140                                  EXT4_GOOD_OLD_INODE_SIZE : \
 141                                  (s)->s_inode_size)
 142 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 143                                  EXT4_GOOD_OLD_FIRST_INO : \
 144                                  (s)->s_first_ino)
 145 #endif
 146 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 147
 148 /*
 149  * Structure of a blocks group descriptor
 150  */
 151 struct ext4_group_desc
 152 {
 153         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 154         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 155         __le32  bg_inode_table_lo;      /* Inodes table block */
 156         __le16  bg_free_blocks_count;   /* Free blocks count */
 157         __le16  bg_free_inodes_count;   /* Free inodes count */
 158         __le16  bg_used_dirs_count;     /* Directories count */
 159         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 160         __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */
 161         __le16  bg_itable_unused;       /* Unused inodes count */
 162         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 163         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 164         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 165         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 166         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 167         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 168         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 169         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 170         __u32   bg_reserved2[3];
 171 };
 172
 173 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 174 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 175 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 176
 177 #ifdef __KERNEL__
 178 #include "ext4_sb.h"
 179 #endif
 180 /*
 181  * Macro-instructions used to manage group descriptors
 182  */
 183 #define EXT4_MIN_DESC_SIZE              32
 184 #define EXT4_MIN_DESC_SIZE_64BIT        64
 185 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 186 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 187 #ifdef __KERNEL__
 188 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 189 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 190 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 191 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 192 #else
 193 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 194 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 195 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 196 #endif
 197
 198 /*
 199  * Constants relative to the data blocks
 200  */
 201 #define EXT4_NDIR_BLOCKS                12
 202 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 203 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 204 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 205 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 206
 207 /*
 208  * Inode flags
 209  */
 210 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 211 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 212 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 213 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 214 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 215 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 216 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 217 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 218 /* Reserved for compression usage... */
 219 #define EXT4_DIRTY_FL                   0x00000100
 220 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 221 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 222 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
 223 /* End compression flags --- maybe not all used */
 224 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 225 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 226 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 227 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 228 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 229 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 230 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 231 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 232 #define EXT4_EXT_MIGRATE                0x00100000 /* Inode is migrating */
 233 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 234
 235 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 236 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 237
 238 /*
 239  * Inode dynamic state flags
 240  */
 241 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
 242 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
 243 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 244 #define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */
 245
 246 /* Used to pass group descriptor data when online resize is done */
 247 struct ext4_new_group_input {
 248         __u32 group;            /* Group number for this data */
 249         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 250         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 251         __u64 inode_table;      /* Absolute block number of inode table start */
 252         __u32 blocks_count;     /* Total number of blocks in this group */
 253         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 254         __u16 unused;
 255 };
 256
 257 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 258 struct ext4_new_group_data {
 259         __u32 group;
 260         __u64 block_bitmap;
 261         __u64 inode_bitmap;
 262         __u64 inode_table;
 263         __u32 blocks_count;
 264         __u16 reserved_blocks;
 265         __u16 unused;
 266         __u32 free_blocks_count;
 267 };
 268
 269 /*
 270  * Following is used by preallocation code to tell get_blocks() that we
 271  * want uninitialzed extents.
 272  */
 273 #define EXT4_CREATE_UNINITIALIZED_EXT           2
 274
 275 /*
 276  * ioctl commands
 277  */
 278 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
 279 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
 280 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 281 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 282 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 283 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
 284 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 285 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 286 #ifdef CONFIG_JBD2_DEBUG
 287 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 288 #endif
 289 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 290 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 291 #define EXT4_IOC_MIGRATE                _IO('f', 7)
 292
 293 /*
 294  * ioctl commands in 32 bit emulation
 295  */
 296 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 297 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 298 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 299 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 300 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 301 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 302 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 303 #ifdef CONFIG_JBD2_DEBUG
 304 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 305 #endif
 306 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 307 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 308
 309
 310 /*
 311  *  Mount options
 312  */
 313 struct ext4_mount_options {
 314         unsigned long s_mount_opt;
 315         uid_t s_resuid;
 316         gid_t s_resgid;
 317         unsigned long s_commit_interval;
 318 #ifdef CONFIG_QUOTA
 319         int s_jquota_fmt;
 320         char *s_qf_names[MAXQUOTAS];
 321 #endif
 322 };
 323
 324 /*
 325  * Structure of an inode on the disk
 326  */
 327 struct ext4_inode {
 328         __le16  i_mode;         /* File mode */
 329         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 330         __le32  i_size_lo;      /* Size in bytes */
 331         __le32  i_atime;        /* Access time */
 332         __le32  i_ctime;        /* Inode Change time */
 333         __le32  i_mtime;        /* Modification time */
 334         __le32  i_dtime;        /* Deletion Time */
 335         __le16  i_gid;          /* Low 16 bits of Group Id */
 336         __le16  i_links_count;  /* Links count */
 337         __le32  i_blocks_lo;    /* Blocks count */
 338         __le32  i_flags;        /* File flags */
 339         union {
 340                 struct {
 341                         __le32  l_i_version;
 342                 } linux1;
 343                 struct {
 344                         __u32  h_i_translator;
 345                 } hurd1;
 346                 struct {
 347                         __u32  m_i_reserved1;
 348                 } masix1;
 349         } osd1;                         /* OS dependent 1 */
 350         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 351         __le32  i_generation;   /* File version (for NFS) */
 352         __le32  i_file_acl_lo;  /* File ACL */
 353         __le32  i_size_high;
 354         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 355         union {
 356                 struct {
 357                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 358                         __le16  l_i_file_acl_high;
 359                         __le16  l_i_uid_high;   /* these 2 fields */
 360                         __le16  l_i_gid_high;   /* were reserved2[0] */
 361                         __u32   l_i_reserved2;
 362                 } linux2;
 363                 struct {
 364                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 365                         __u16   h_i_mode_high;
 366                         __u16   h_i_uid_high;
 367                         __u16   h_i_gid_high;
 368                         __u32   h_i_author;
 369                 } hurd2;
 370                 struct {
 371                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 372                         __le16  m_i_file_acl_high;
 373                         __u32   m_i_reserved2[2];
 374                 } masix2;
 375         } osd2;                         /* OS dependent 2 */
 376         __le16  i_extra_isize;
 377         __le16  i_pad1;
 378         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 379         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 380         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 381         __le32  i_crtime;       /* File Creation time */
 382         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 383         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 384 };
 385
 386
 387 #define EXT4_EPOCH_BITS 2
 388 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 389 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 390
 391 /*
 392  * Extended fields will fit into an inode if the filesystem was formatted
 393  * with large inodes (-I 256 or larger) and there are not currently any EAs
 394  * consuming all of the available space. For new inodes we always reserve
 395  * enough space for the kernel's known extended fields, but for inodes
 396  * created with an old kernel this might not have been the case. None of
 397  * the extended inode fields is critical for correct filesystem operation.
 398  * This macro checks if a certain field fits in the inode. Note that
 399  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 400  */
 401 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 402         ((offsetof(typeof(*ext4_inode), field) +        \
 403           sizeof((ext4_inode)->field))                  \
 404         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 405             (einode)->i_extra_isize))                   \
 406
 407 static inline __le32 ext4_encode_extra_time(struct timespec *time)
 408 {
 409        return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
 410                            time->tv_sec >> 32 : 0) |
 411                            ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
 412 }
 413
 414 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
 415 {
 416        if (sizeof(time->tv_sec) > 4)
 417                time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
 418                                << 32;
 419        time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
 420 }
 421
 422 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \
 423 do {                                                                           \
 424         (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \
 425         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 426                 (raw_inode)->xtime ## _extra =                                 \
 427                                 ext4_encode_extra_time(&(inode)->xtime);       \
 428 } while (0)
 429
 430 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 431 do {                                                                           \
 432         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 433                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 434         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 435                 (raw_inode)->xtime ## _extra =                                 \
 436                                 ext4_encode_extra_time(&(einode)->xtime);      \
 437 } while (0)
 438
 439 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \
 440 do {                                                                           \
 441         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \
 442         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \
 443                 ext4_decode_extra_time(&(inode)->xtime,                        \
 444                                        raw_inode->xtime ## _extra);            \
 445 } while (0)
 446
 447 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 448 do {                                                                           \
 449         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 450                 (einode)->xtime.tv_sec =                                       \
 451                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 452         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 453                 ext4_decode_extra_time(&(einode)->xtime,                       \
 454                                        raw_inode->xtime ## _extra);            \
 455 } while (0)
 456
 457 #define i_disk_version osd1.linux1.l_i_version
 458
 459 #if defined(__KERNEL__) || defined(__linux__)
 460 #define i_reserved1     osd1.linux1.l_i_reserved1
 461 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 462 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 463 #define i_uid_low       i_uid
 464 #define i_gid_low       i_gid
 465 #define i_uid_high      osd2.linux2.l_i_uid_high
 466 #define i_gid_high      osd2.linux2.l_i_gid_high
 467 #define i_reserved2     osd2.linux2.l_i_reserved2
 468
 469 #elif defined(__GNU__)
 470
 471 #define i_translator    osd1.hurd1.h_i_translator
 472 #define i_uid_high      osd2.hurd2.h_i_uid_high
 473 #define i_gid_high      osd2.hurd2.h_i_gid_high
 474 #define i_author        osd2.hurd2.h_i_author
 475
 476 #elif defined(__masix__)
 477
 478 #define i_reserved1     osd1.masix1.m_i_reserved1
 479 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 480 #define i_reserved2     osd2.masix2.m_i_reserved2
 481
 482 #endif /* defined(__KERNEL__) || defined(__linux__) */
 483
 484 /*
 485  * File system states
 486  */
 487 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
 488 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
 489 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 490
 491 /*
 492  * Misc. filesystem flags
 493  */
 494 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 495 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 496 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 497
 498 /*
 499  * Mount flags
 500  */
 501 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 502 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 503 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 504 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 505 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 506 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 507 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 508 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 509 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 510 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
 511 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 512 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 513 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 514 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 515 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 516 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 517 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 518 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 519 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
 520 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
 521 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
 522 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
 523 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 524 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 525 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
 526 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
 527 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 528 #define EXT4_MOUNT_I_VERSION            0x2000000 /* i_version support */
 529 #define EXT4_MOUNT_MBALLOC              0x4000000 /* Buddy allocation support */
 530 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 531 #ifndef _LINUX_EXT2_FS_H
 532 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
 533 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
 534 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
 535                                          EXT4_MOUNT_##opt)
 536 #else
 537 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
 538 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
 539 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
 540 #endif
 541
 542 #define ext4_set_bit                    ext2_set_bit
 543 #define ext4_set_bit_atomic             ext2_set_bit_atomic
 544 #define ext4_clear_bit                  ext2_clear_bit
 545 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
 546 #define ext4_test_bit                   ext2_test_bit
 547 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
 548 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
 549 #define ext4_find_next_bit              ext2_find_next_bit
 550
 551 /*
 552  * Maximal mount counts between two filesystem checks
 553  */
 554 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 555 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 556
 557 /*
 558  * Behaviour when detecting errors
 559  */
 560 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
 561 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
 562 #define EXT4_ERRORS_PANIC               3       /* Panic */
 563 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
 564
 565 /*
 566  * Structure of the super block
 567  */
 568 struct ext4_super_block {
 569 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 570         __le32  s_blocks_count_lo;      /* Blocks count */
 571         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
 572         __le32  s_free_blocks_count_lo; /* Free blocks count */
 573 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 574         __le32  s_first_data_block;     /* First Data Block */
 575         __le32  s_log_block_size;       /* Block size */
 576         __le32  s_obso_log_frag_size;   /* Obsoleted fragment size */
 577 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 578         __le32  s_obso_frags_per_group; /* Obsoleted fragments per group */
 579         __le32  s_inodes_per_group;     /* # Inodes per group */
 580         __le32  s_mtime;                /* Mount time */
 581 /*30*/  __le32  s_wtime;                /* Write time */
 582         __le16  s_mnt_count;            /* Mount count */
 583         __le16  s_max_mnt_count;        /* Maximal mount count */
 584         __le16  s_magic;                /* Magic signature */
 585         __le16  s_state;                /* File system state */
 586         __le16  s_errors;               /* Behaviour when detecting errors */
 587         __le16  s_minor_rev_level;      /* minor revision level */
 588 /*40*/  __le32  s_lastcheck;            /* time of last check */
 589         __le32  s_checkinterval;        /* max. time between checks */
 590         __le32  s_creator_os;           /* OS */
 591         __le32  s_rev_level;            /* Revision level */
 592 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 593         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 594         /*
 595          * These fields are for EXT4_DYNAMIC_REV superblocks only.
 596          *
 597          * Note: the difference between the compatible feature set and
 598          * the incompatible feature set is that if there is a bit set
 599          * in the incompatible feature set that the kernel doesn't
 600          * know about, it should refuse to mount the filesystem.
 601          *
 602          * e2fsck's requirements are more strict; if it doesn't know
 603          * about a feature in either the compatible or incompatible
 604          * feature set, it must abort and not try to meddle with
 605          * things it doesn't understand...
 606          */
 607         __le32  s_first_ino;            /* First non-reserved inode */
 608         __le16  s_inode_size;           /* size of inode structure */
 609         __le16  s_block_group_nr;       /* block group # of this superblock */
 610         __le32  s_feature_compat;       /* compatible feature set */
 611 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 612         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 613 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 614 /*78*/  char    s_volume_name[16];      /* volume name */
 615 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 616 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 617         /*
 618          * Performance hints.  Directory preallocation should only
 619          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 620          */
 621         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 622         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 623         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 624         /*
 625          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
 626          */
 627 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 628 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 629         __le32  s_journal_dev;          /* device number of journal file */
 630         __le32  s_last_orphan;          /* start of list of inodes to delete */
 631         __le32  s_hash_seed[4];         /* HTREE hash seed */
 632         __u8    s_def_hash_version;     /* Default hash version to use */
 633         __u8    s_reserved_char_pad;
 634         __le16  s_desc_size;            /* size of group descriptor */
 635 /*100*/ __le32  s_default_mount_opts;
 636         __le32  s_first_meta_bg;        /* First metablock block group */
 637         __le32  s_mkfs_time;            /* When the filesystem was created */
 638         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
 639         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 640 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
 641         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
 642         __le32  s_free_blocks_count_hi; /* Free blocks count */
 643         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
 644         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
 645         __le32  s_flags;                /* Miscellaneous flags */
 646         __le16  s_raid_stride;          /* RAID stride */
 647         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
 648         __le64  s_mmp_block;            /* Block for multi-mount protection */
 649         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 650         __u32   s_reserved[163];        /* Padding to the end of the block */
 651 };
 652
 653 #ifdef __KERNEL__
 654 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
 655 {
 656         return sb->s_fs_info;
 657 }
 658 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
 659 {
 660         return container_of(inode, struct ext4_inode_info, vfs_inode);
 661 }
 662
 663 static inline struct timespec ext4_current_time(struct inode *inode)
 664 {
 665         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
 666                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
 667 }
 668
 669
 670 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
 671 {
 672         return ino == EXT4_ROOT_INO ||
 673                 ino == EXT4_JOURNAL_INO ||
 674                 ino == EXT4_RESIZE_INO ||
 675                 (ino >= EXT4_FIRST_INO(sb) &&
 676                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
 677 }
 678 #else
 679 /* Assume that user mode programs are passing in an ext4fs superblock, not
 680  * a kernel struct super_block.  This will allow us to call the feature-test
 681  * macros from user land. */
 682 #define EXT4_SB(sb)     (sb)
 683 #endif
 684
 685 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 686
 687 /*
 688  * Codes for operating systems
 689  */
 690 #define EXT4_OS_LINUX           0
 691 #define EXT4_OS_HURD            1
 692 #define EXT4_OS_MASIX           2
 693 #define EXT4_OS_FREEBSD         3
 694 #define EXT4_OS_LITES           4
 695
 696 /*
 697  * Revision levels
 698  */
 699 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
 700 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 701
 702 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
 703 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
 704
 705 #define EXT4_GOOD_OLD_INODE_SIZE 128
 706
 707 /*
 708  * Feature set definitions
 709  */
 710
 711 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
 712         ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 713 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 714         ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 715 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 716         ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 717 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
 718         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 719 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 720         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 721 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
 722         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 723 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 724         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 725 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 726         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 727 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 728         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 729
 730 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 731 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 732 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 733 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
 734 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
 735 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
 736
 737 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 738 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 739 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 740 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 741 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 742 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 743 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 744
 745 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
 746 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
 747 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 748 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 749 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
 750 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
 751 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 752 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 753 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 754
 755 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 756 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
 757                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
 758                                          EXT4_FEATURE_INCOMPAT_META_BG| \
 759                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
 760                                          EXT4_FEATURE_INCOMPAT_64BIT| \
 761                                          EXT4_FEATURE_INCOMPAT_FLEX_BG)
 762 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 763                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 764                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
 765                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
 766                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
 767                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
 768                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 769
 770 /*
 771  * Default values for user and/or group using reserved blocks
 772  */
 773 #define EXT4_DEF_RESUID         0
 774 #define EXT4_DEF_RESGID         0
 775
 776 /*
 777  * Default mount options
 778  */
 779 #define EXT4_DEFM_DEBUG         0x0001
 780 #define EXT4_DEFM_BSDGROUPS     0x0002
 781 #define EXT4_DEFM_XATTR_USER    0x0004
 782 #define EXT4_DEFM_ACL           0x0008
 783 #define EXT4_DEFM_UID16         0x0010
 784 #define EXT4_DEFM_JMODE         0x0060
 785 #define EXT4_DEFM_JMODE_DATA    0x0020
 786 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 787 #define EXT4_DEFM_JMODE_WBACK   0x0060
 788
 789 /*
 790  * Structure of a directory entry
 791  */
 792 #define EXT4_NAME_LEN 255
 793
 794 struct ext4_dir_entry {
 795         __le32  inode;                  /* Inode number */
 796         __le16  rec_len;                /* Directory entry length */
 797         __le16  name_len;               /* Name length */
 798         char    name[EXT4_NAME_LEN];    /* File name */
 799 };
 800
 801 /*
 802  * The new version of the directory entry.  Since EXT4 structures are
 803  * stored in intel byte order, and the name_len field could never be
 804  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 805  * file_type field.
 806  */
 807 struct ext4_dir_entry_2 {
 808         __le32  inode;                  /* Inode number */
 809         __le16  rec_len;                /* Directory entry length */
 810         __u8    name_len;               /* Name length */
 811         __u8    file_type;
 812         char    name[EXT4_NAME_LEN];    /* File name */
 813 };
 814
 815 /*
 816  * Ext4 directory file types.  Only the low 3 bits are used.  The
 817  * other bits are reserved for now.
 818  */
 819 #define EXT4_FT_UNKNOWN         0
 820 #define EXT4_FT_REG_FILE        1
 821 #define EXT4_FT_DIR             2
 822 #define EXT4_FT_CHRDEV          3
 823 #define EXT4_FT_BLKDEV          4
 824 #define EXT4_FT_FIFO            5
 825 #define EXT4_FT_SOCK            6
 826 #define EXT4_FT_SYMLINK         7
 827
 828 #define EXT4_FT_MAX             8
 829
 830 /*
 831  * EXT4_DIR_PAD defines the directory entries boundaries
 832  *
 833  * NOTE: It must be a multiple of 4
 834  */
 835 #define EXT4_DIR_PAD                    4
 836 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
 837 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
 838                                          ~EXT4_DIR_ROUND)
 839 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
 840
 841 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
 842 {
 843         unsigned len = le16_to_cpu(dlen);
 844
 845         if (len == EXT4_MAX_REC_LEN)
 846                 return 1 << 16;
 847         return len;
 848 }
 849
 850 static inline __le16 ext4_rec_len_to_disk(unsigned len)
 851 {
 852         if (len == (1 << 16))
 853                 return cpu_to_le16(EXT4_MAX_REC_LEN);
 854         else if (len > (1 << 16))
 855                 BUG();
 856         return cpu_to_le16(len);
 857 }
 858
 859 /*
 860  * Hash Tree Directory indexing
 861  * (c) Daniel Phillips, 2001
 862  */
 863
 864 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
 865                                       EXT4_FEATURE_COMPAT_DIR_INDEX) && \
 866                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 867 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 868 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 869
 870 /* Legal values for the dx_root hash_version field: */
 871
 872 #define DX_HASH_LEGACY          0
 873 #define DX_HASH_HALF_MD4        1
 874 #define DX_HASH_TEA             2
 875
 876 #ifdef __KERNEL__
 877
 878 /* hash info structure used by the directory hash */
 879 struct dx_hash_info
 880 {
 881         u32             hash;
 882         u32             minor_hash;
 883         int             hash_version;
 884         u32             *seed;
 885 };
 886
 887 #define EXT4_HTREE_EOF  0x7fffffff
 888
 889 /*
 890  * Control parameters used by ext4_htree_next_block
 891  */
 892 #define HASH_NB_ALWAYS          1
 893
 894
 895 /*
 896  * Describe an inode's exact location on disk and in memory
 897  */
 898 struct ext4_iloc
 899 {
 900         struct buffer_head *bh;
 901         unsigned long offset;
 902         ext4_group_t block_group;
 903 };
 904
 905 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 906 {
 907         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 908 }
 909
 910 /*
 911  * This structure is stuffed into the struct file's private_data field
 912  * for directories.  It is where we put information so that we can do
 913  * readdir operations in hash tree order.
 914  */
 915 struct dir_private_info {
 916         struct rb_root  root;
 917         struct rb_node  *curr_node;
 918         struct fname    *extra_fname;
 919         loff_t          last_pos;
 920         __u32           curr_hash;
 921         __u32           curr_minor_hash;
 922         __u32           next_hash;
 923 };
 924
 925 /* calculate the first block number of the group */
 926 static inline ext4_fsblk_t
 927 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
 928 {
 929         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
 930                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
 931 }
 932
 933 /*
 934  * Special error return code only used by dx_probe() and its callers.
 935  */
 936 #define ERR_BAD_DX_DIR  -75000
 937
 938 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
 939                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
 940
 941 /*
 942  * Function prototypes
 943  */
 944
 945 /*
 946  * Ok, these declarations are also in <linux/kernel.h> but none of the
 947  * ext4 source programs needs to include it so they are duplicated here.
 948  */
 949 # define NORET_TYPE     /**/
 950 # define ATTRIB_NORET   __attribute__((noreturn))
 951 # define NORET_AND      noreturn,
 952
 953 /* balloc.c */
 954 extern unsigned int ext4_block_group(struct super_block *sb,
 955                         ext4_fsblk_t blocknr);
 956 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
 957                         ext4_fsblk_t blocknr);
 958 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
 959 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
 960                         ext4_group_t group);
 961 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
 962                         ext4_fsblk_t goal, int *errp);
 963 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
 964                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 965 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
 966                         ext4_fsblk_t goal, unsigned long *count, int *errp);
 967 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
 968                         ext4_fsblk_t block, unsigned long count, int metadata);
 969 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
 970                                  ext4_fsblk_t block, unsigned long count,
 971                                 unsigned long *pdquot_freed_blocks);
 972 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
 973 extern void ext4_check_blocks_bitmap (struct super_block *);
 974 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
 975                                                     ext4_group_t block_group,
 976                                                     struct buffer_head ** bh);
 977 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
 978 extern void ext4_init_block_alloc_info(struct inode *);
 979 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
 980
 981 /* dir.c */
 982 extern int ext4_check_dir_entry(const char *, struct inode *,
 983                                 struct ext4_dir_entry_2 *,
 984                                 struct buffer_head *, unsigned long);
 985 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
 986                                     __u32 minor_hash,
 987                                     struct ext4_dir_entry_2 *dirent);
 988 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
 989
 990 /* fsync.c */
 991 extern int ext4_sync_file (struct file *, struct dentry *, int);
 992
 993 /* hash.c */
 994 extern int ext4fs_dirhash(const char *name, int len, struct
 995                           dx_hash_info *hinfo);
 996
 997 /* ialloc.c */
 998 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
 999 extern void ext4_free_inode (handle_t *, struct inode *);
1000 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
1001 extern unsigned long ext4_count_free_inodes (struct super_block *);
1002 extern unsigned long ext4_count_dirs (struct super_block *);
1003 extern void ext4_check_inodes_bitmap (struct super_block *);
1004 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
1005
1006 /* mballoc.c */
1007 extern long ext4_mb_stats;
1008 extern long ext4_mb_max_to_scan;
1009 extern int ext4_mb_init(struct super_block *, int);
1010 extern int ext4_mb_release(struct super_block *);
1011 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1012                                 struct ext4_allocation_request *, int *);
1013 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1014 extern void ext4_mb_discard_inode_preallocations(struct inode *);
1015 extern int __init init_ext4_mballoc(void);
1016 extern void exit_ext4_mballoc(void);
1017 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1018                 unsigned long, unsigned long, int, unsigned long *);
1019
1020
1021 /* inode.c */
1022 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1023                 struct buffer_head *bh, ext4_fsblk_t blocknr);
1024 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1025                                                 ext4_lblk_t, int, int *);
1026 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1027                                                 ext4_lblk_t, int, int *);
1028 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1029                                 ext4_lblk_t iblock, unsigned long maxblocks,
1030                                 struct buffer_head *bh_result,
1031                                 int create, int extend_disksize);
1032
1033 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1034 extern int  ext4_write_inode (struct inode *, int);
1035 extern int  ext4_setattr (struct dentry *, struct iattr *);
1036 extern void ext4_delete_inode (struct inode *);
1037 extern int  ext4_sync_inode (handle_t *, struct inode *);
1038 extern void ext4_discard_reservation (struct inode *);
1039 extern void ext4_dirty_inode(struct inode *);
1040 extern int ext4_change_inode_journal_flag(struct inode *, int);
1041 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1042 extern void ext4_truncate (struct inode *);
1043 extern void ext4_set_inode_flags(struct inode *);
1044 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1045 extern void ext4_set_aops(struct inode *inode);
1046 extern int ext4_writepage_trans_blocks(struct inode *);
1047 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
1048                 struct address_space *mapping, loff_t from);
1049
1050 /* ioctl.c */
1051 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1052 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
1053
1054 /* migrate.c */
1055 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1056                        unsigned long);
1057 /* namei.c */
1058 extern int ext4_orphan_add(handle_t *, struct inode *);
1059 extern int ext4_orphan_del(handle_t *, struct inode *);
1060 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1061                                 __u32 start_minor_hash, __u32 *next_hash);
1062
1063 /* resize.c */
1064 extern int ext4_group_add(struct super_block *sb,
1065                                 struct ext4_new_group_data *input);
1066 extern int ext4_group_extend(struct super_block *sb,
1067                                 struct ext4_super_block *es,
1068                                 ext4_fsblk_t n_blocks_count);
1069
1070 /* super.c */
1071 extern void ext4_error (struct super_block *, const char *, const char *, ...)
1072         __attribute__ ((format (printf, 3, 4)));
1073 extern void __ext4_std_error (struct super_block *, const char *, int);
1074 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1075         __attribute__ ((format (printf, 3, 4)));
1076 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1077         __attribute__ ((format (printf, 3, 4)));
1078 extern void ext4_update_dynamic_rev (struct super_block *sb);
1079 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1080                                         __u32 compat);
1081 extern int ext4_update_rocompat_feature(handle_t *handle,
1082                                         struct super_block *sb, __u32 rocompat);
1083 extern int ext4_update_incompat_feature(handle_t *handle,
1084                                         struct super_block *sb, __u32 incompat);
1085 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1086                                       struct ext4_group_desc *bg);
1087 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1088                                       struct ext4_group_desc *bg);
1089 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1090                                      struct ext4_group_desc *bg);
1091 extern void ext4_block_bitmap_set(struct super_block *sb,
1092                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1093 extern void ext4_inode_bitmap_set(struct super_block *sb,
1094                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
1095 extern void ext4_inode_table_set(struct super_block *sb,
1096                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
1097
1098 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1099 {
1100         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1101                 le32_to_cpu(es->s_blocks_count_lo);
1102 }
1103
1104 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1105 {
1106         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1107                 le32_to_cpu(es->s_r_blocks_count_lo);
1108 }
1109
1110 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1111 {
1112         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1113                 le32_to_cpu(es->s_free_blocks_count_lo);
1114 }
1115
1116 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1117                                          ext4_fsblk_t blk)
1118 {
1119         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1120         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1121 }
1122
1123 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1124                                               ext4_fsblk_t blk)
1125 {
1126         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1127         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1128 }
1129
1130 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1131                                            ext4_fsblk_t blk)
1132 {
1133         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1134         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1135 }
1136
1137 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1138 {
1139         return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1140                 le32_to_cpu(raw_inode->i_size_lo);
1141 }
1142
1143 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1144 {
1145         raw_inode->i_size_lo = cpu_to_le32(i_size);
1146         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1147 }
1148
1149 static inline
1150 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1151                                                         ext4_group_t group)
1152 {
1153          struct ext4_group_info ***grp_info;
1154          long indexv, indexh;
1155          grp_info = EXT4_SB(sb)->s_group_info;
1156          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1157          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1158          return grp_info[indexv][indexh];
1159 }
1160
1161
1162 #define ext4_std_error(sb, errno)                               \
1163 do {                                                            \
1164         if ((errno))                                            \
1165                 __ext4_std_error((sb), __FUNCTION__, (errno));  \
1166 } while (0)
1167
1168 /*
1169  * Inodes and files operations
1170  */
1171
1172 /* dir.c */
1173 extern const struct file_operations ext4_dir_operations;
1174
1175 /* file.c */
1176 extern const struct inode_operations ext4_file_inode_operations;
1177 extern const struct file_operations ext4_file_operations;
1178
1179 /* namei.c */
1180 extern const struct inode_operations ext4_dir_inode_operations;
1181 extern const struct inode_operations ext4_special_inode_operations;
1182
1183 /* symlink.c */
1184 extern const struct inode_operations ext4_symlink_inode_operations;
1185 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1186
1187 /* extents.c */
1188 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1189 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1190 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1191                         ext4_lblk_t iblock,
1192                         unsigned long max_blocks, struct buffer_head *bh_result,
1193                         int create, int extend_disksize);
1194 extern void ext4_ext_truncate(struct inode *, struct page *);
1195 extern void ext4_ext_init(struct super_block *);
1196 extern void ext4_ext_release(struct super_block *);
1197 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1198                           loff_t len);
1199 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1200                         sector_t block, unsigned long max_blocks,
1201                         struct buffer_head *bh, int create,
1202                         int extend_disksize);
1203 #endif  /* __KERNEL__ */
1204
1205 #endif  /* _EXT4_H */