include/linux/ext3_fs.h

   1 /*
   2  *  linux/include/linux/ext3_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_EXT3_FS_H
  17 #define _LINUX_EXT3_FS_H
  18
  19 #include <linux/types.h>
  20 #include <linux/ext3_fs_i.h>
  21 #include <linux/ext3_fs_sb.h>
  22
  23
  24 struct statfs;
  25
  26 /*
  27  * The second extended filesystem constants/structures
  28  */
  29
  30 /*
  31  * Define EXT3FS_DEBUG to produce debug messages
  32  */
  33 #undef EXT3FS_DEBUG
  34
  35 /*
  36  * Define EXT3_RESERVATION to reserve data blocks for expanding files
  37  */
  38 #define EXT3_DEFAULT_RESERVE_BLOCKS     8
  39 #define EXT3_MAX_RESERVE_BLOCKS         1024
  40 /*
  41  * Always enable hashed directories
  42  */
  43 #define CONFIG_EXT3_INDEX
  44
  45 /*
  46  * Debug code
  47  */
  48 #ifdef EXT3FS_DEBUG
  49 #define ext3_debug(f, a...)                                             \
  50         do {                                                            \
  51                 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
  52                         __FILE__, __LINE__, __FUNCTION__);              \
  53                 printk (KERN_DEBUG f, ## a);                            \
  54         } while (0)
  55 #else
  56 #define ext3_debug(f, a...)     do {} while (0)
  57 #endif
  58
  59 /*
  60  * Special inodes numbers
  61  */
  62 #define EXT3_BAD_INO             1      /* Bad blocks inode */
  63 #define EXT3_ROOT_INO            2      /* Root inode */
  64 #define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
  65 #define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
  66 #define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
  67 #define EXT3_JOURNAL_INO         8      /* Journal inode */
  68
  69 /* First non-reserved inode for old ext3 filesystems */
  70 #define EXT3_GOOD_OLD_FIRST_INO 11
  71
  72 /*
  73  * The second extended file system magic number
  74  */
  75 #define EXT3_SUPER_MAGIC        0xEF53
  76
  77 /*
  78  * Maximal count of links to a file
  79  */
  80 #define EXT3_LINK_MAX           32000
  81
  82 /*
  83  * Macro-instructions used to manage several block sizes
  84  */
  85 #define EXT3_MIN_BLOCK_SIZE             1024
  86 #define EXT3_MAX_BLOCK_SIZE             4096
  87 #define EXT3_MIN_BLOCK_LOG_SIZE           10
  88 #ifdef __KERNEL__
  89 # define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)
  90 #else
  91 # define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  92 #endif
  93 #define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
  94 #ifdef __KERNEL__
  95 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  96 #else
  97 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  98 #endif
  99 #ifdef __KERNEL__
 100 #define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
 101 #define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
 102 #define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
 103 #else
 104 #define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 105                                  EXT3_GOOD_OLD_INODE_SIZE : \
 106                                  (s)->s_inode_size)
 107 #define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 108                                  EXT3_GOOD_OLD_FIRST_INO : \
 109                                  (s)->s_first_ino)
 110 #endif
 111
 112 /*
 113  * Macro-instructions used to manage fragments
 114  */
 115 #define EXT3_MIN_FRAG_SIZE              1024
 116 #define EXT3_MAX_FRAG_SIZE              4096
 117 #define EXT3_MIN_FRAG_LOG_SIZE            10
 118 #ifdef __KERNEL__
 119 # define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)
 120 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)
 121 #else
 122 # define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 123 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
 124 #endif
 125
 126 /*
 127  * Structure of a blocks group descriptor
 128  */
 129 struct ext3_group_desc
 130 {
 131         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 132         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 133         __u32   bg_inode_table;         /* Inodes table block */
 134         __u16   bg_free_blocks_count;   /* Free blocks count */
 135         __u16   bg_free_inodes_count;   /* Free inodes count */
 136         __u16   bg_used_dirs_count;     /* Directories count */
 137         __u16   bg_pad;
 138         __u32   bg_reserved[3];
 139 };
 140
 141 /*
 142  * Macro-instructions used to manage group descriptors
 143  */
 144 #ifdef __KERNEL__
 145 # define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)
 146 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)
 147 # define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)
 148 # define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)
 149 #else
 150 # define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 151 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
 152 # define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 153 #endif
 154
 155 /*
 156  * Constants relative to the data blocks
 157  */
 158 #define EXT3_NDIR_BLOCKS                12
 159 #define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
 160 #define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
 161 #define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
 162 #define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
 163
 164 /*
 165  * Inode flags
 166  */
 167 #define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
 168 #define EXT3_UNRM_FL                    0x00000002 /* Undelete */
 169 #define EXT3_COMPR_FL                   0x00000004 /* Compress file */
 170 #define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
 171 #define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
 172 #define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
 173 #define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
 174 #define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
 175 /* Reserved for compression usage... */
 176 #define EXT3_DIRTY_FL                   0x00000100
 177 #define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 178 #define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
 179 #define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
 180 /* End compression flags --- maybe not all used */
 181 #define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
 182 #define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
 183 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 184 #define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 185 #define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 186 #define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 187 #define EXT3_BARRIER_FL                 0x04000000 /* Barrier for chroot() */
 188 #define EXT3_IUNLINK_FL                 0x08000000 /* Immutable unlink */
 189 #define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
 190
 191 #define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 192 #define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 193
 194 /*
 195  * Inode dynamic state flags
 196  */
 197 #define EXT3_STATE_JDATA                0x00000001 /* journaled data exists */
 198 #define EXT3_STATE_NEW                  0x00000002 /* inode is newly created */
 199 #define EXT3_STATE_RESIZE               0x00000004 /* fake inode for resizing */
 200
 201
 202 /* Used to pass group descriptor data when online resize is done */
 203 struct ext3_new_group_input {
 204         __u32 group;            /* Group number for this data */
 205         __u32 block_bitmap;     /* Absolute block number of block bitmap */
 206         __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
 207         __u32 inode_table;      /* Absolute block number of inode table start */
 208         __u32 blocks_count;     /* Total number of blocks in this group */
 209         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 210         __u16 unused;
 211 };
 212
 213 /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
 214 struct ext3_new_group_data {
 215         __u32 group;
 216         __u32 block_bitmap;
 217         __u32 inode_bitmap;
 218         __u32 inode_table;
 219         __u32 blocks_count;
 220         __u16 reserved_blocks;
 221         __u16 unused;
 222         __u32 free_blocks_count;
 223 };
 224
 225
 226 /*
 227  * ioctl commands
 228  */
 229 #define EXT3_IOC_GETFLAGS               _IOR('f', 1, long)
 230 #define EXT3_IOC_SETFLAGS               _IOW('f', 2, long)
 231 #define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
 232 #define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
 233 #define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 234 #define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)
 235 #define EXT3_IOC_GETVERSION_OLD         _IOR('v', 1, long)
 236 #define EXT3_IOC_SETVERSION_OLD         _IOW('v', 2, long)
 237 #ifdef CONFIG_JBD_DEBUG
 238 #define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 239 #endif
 240 #define EXT3_IOC_GETRSVSZ               _IOR('r', 1, long)
 241 #define EXT3_IOC_SETRSVSZ               _IOW('r', 2, long)
 242 #ifdef  CONFIG_VSERVER_LEGACY
 243 #define EXT3_IOC_SETXID                 FIOC_SETXIDJ
 244 #endif
 245
 246 /*
 247  * Structure of an inode on the disk
 248  */
 249 struct ext3_inode {
 250         __u16   i_mode;         /* File mode */
 251         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 252         __u32   i_size;         /* Size in bytes */
 253         __u32   i_atime;        /* Access time */
 254         __u32   i_ctime;        /* Creation time */
 255         __u32   i_mtime;        /* Modification time */
 256         __u32   i_dtime;        /* Deletion Time */
 257         __u16   i_gid;          /* Low 16 bits of Group Id */
 258         __u16   i_links_count;  /* Links count */
 259         __u32   i_blocks;       /* Blocks count */
 260         __u32   i_flags;        /* File flags */
 261         union {
 262                 struct {
 263                         __u32  l_i_reserved1;
 264                 } linux1;
 265                 struct {
 266                         __u32  h_i_translator;
 267                 } hurd1;
 268                 struct {
 269                         __u32  m_i_reserved1;
 270                 } masix1;
 271         } osd1;                         /* OS dependent 1 */
 272         __u32   i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
 273         __u32   i_generation;   /* File version (for NFS) */
 274         __u32   i_file_acl;     /* File ACL */
 275         __u32   i_dir_acl;      /* Directory ACL */
 276         __u32   i_faddr;        /* Fragment address */
 277         union {
 278                 struct {
 279                         __u8    l_i_frag;       /* Fragment number */
 280                         __u8    l_i_fsize;      /* Fragment size */
 281                         __u16   l_i_xid;        /* LRU Context */
 282                         __u16   l_i_uid_high;   /* these 2 fields    */
 283                         __u16   l_i_gid_high;   /* were reserved2[0] */
 284                         __u32   l_i_reserved2;
 285                 } linux2;
 286                 struct {
 287                         __u8    h_i_frag;       /* Fragment number */
 288                         __u8    h_i_fsize;      /* Fragment size */
 289                         __u16   h_i_mode_high;
 290                         __u16   h_i_uid_high;
 291                         __u16   h_i_gid_high;
 292                         __u32   h_i_author;
 293                 } hurd2;
 294                 struct {
 295                         __u8    m_i_frag;       /* Fragment number */
 296                         __u8    m_i_fsize;      /* Fragment size */
 297                         __u16   m_pad1;
 298                         __u32   m_i_reserved2[2];
 299                 } masix2;
 300         } osd2;                         /* OS dependent 2 */
 301 };
 302
 303 #define i_size_high     i_dir_acl
 304
 305 #if defined(__KERNEL__) || defined(__linux__)
 306 #define i_reserved1     osd1.linux1.l_i_reserved1
 307 #define i_frag          osd2.linux2.l_i_frag
 308 #define i_fsize         osd2.linux2.l_i_fsize
 309 #define i_uid_low       i_uid
 310 #define i_gid_low       i_gid
 311 #define i_uid_high      osd2.linux2.l_i_uid_high
 312 #define i_gid_high      osd2.linux2.l_i_gid_high
 313 #define i_raw_xid       osd2.linux2.l_i_xid
 314 #define i_reserved2     osd2.linux2.l_i_reserved2
 315
 316 #elif defined(__GNU__)
 317
 318 #define i_translator    osd1.hurd1.h_i_translator
 319 #define i_frag          osd2.hurd2.h_i_frag;
 320 #define i_fsize         osd2.hurd2.h_i_fsize;
 321 #define i_uid_high      osd2.hurd2.h_i_uid_high
 322 #define i_gid_high      osd2.hurd2.h_i_gid_high
 323 #define i_author        osd2.hurd2.h_i_author
 324
 325 #elif defined(__masix__)
 326
 327 #define i_reserved1     osd1.masix1.m_i_reserved1
 328 #define i_frag          osd2.masix2.m_i_frag
 329 #define i_fsize         osd2.masix2.m_i_fsize
 330 #define i_reserved2     osd2.masix2.m_i_reserved2
 331
 332 #endif /* defined(__KERNEL__) || defined(__linux__) */
 333
 334 /*
 335  * File system states
 336  */
 337 #define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
 338 #define EXT3_ERROR_FS                   0x0002  /* Errors detected */
 339 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 340
 341 /*
 342  * Mount flags
 343  */
 344 #define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 345 #define EXT3_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 346 #define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 347 #define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 348 #define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 349 #define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 350 #define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 351 #define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 352 #define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 353 #define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
 354 #define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 355 #define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 356 #define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 357 #define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 358 #define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 359 #define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 360 #define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 361 #define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 362 #define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
 363 #define EXT3_MOUNT_TAG_XID              0x20000 /* Enable Context Tags */
 364
 365 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
 366 #ifndef _LINUX_EXT2_FS_H
 367 #define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
 368 #define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
 369 #define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
 370                                          EXT3_MOUNT_##opt)
 371 #else
 372 #define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
 373 #define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
 374 #define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
 375 #endif
 376
 377 #define ext3_set_bit                    ext2_set_bit
 378 #define ext3_set_bit_atomic             ext2_set_bit_atomic
 379 #define ext3_clear_bit                  ext2_clear_bit
 380 #define ext3_clear_bit_atomic           ext2_clear_bit_atomic
 381 #define ext3_test_bit                   ext2_test_bit
 382 #define ext3_find_first_zero_bit        ext2_find_first_zero_bit
 383 #define ext3_find_next_zero_bit         ext2_find_next_zero_bit
 384
 385 /*
 386  * Maximal mount counts between two filesystem checks
 387  */
 388 #define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 389 #define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 390
 391 /*
 392  * Behaviour when detecting errors
 393  */
 394 #define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
 395 #define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
 396 #define EXT3_ERRORS_PANIC               3       /* Panic */
 397 #define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
 398
 399 /*
 400  * Structure of the super block
 401  */
 402 struct ext3_super_block {
 403 /*00*/  __u32   s_inodes_count;         /* Inodes count */
 404         __u32   s_blocks_count;         /* Blocks count */
 405         __u32   s_r_blocks_count;       /* Reserved blocks count */
 406         __u32   s_free_blocks_count;    /* Free blocks count */
 407 /*10*/  __u32   s_free_inodes_count;    /* Free inodes count */
 408         __u32   s_first_data_block;     /* First Data Block */
 409         __u32   s_log_block_size;       /* Block size */
 410         __s32   s_log_frag_size;        /* Fragment size */
 411 /*20*/  __u32   s_blocks_per_group;     /* # Blocks per group */
 412         __u32   s_frags_per_group;      /* # Fragments per group */
 413         __u32   s_inodes_per_group;     /* # Inodes per group */
 414         __u32   s_mtime;                /* Mount time */
 415 /*30*/  __u32   s_wtime;                /* Write time */
 416         __u16   s_mnt_count;            /* Mount count */
 417         __s16   s_max_mnt_count;        /* Maximal mount count */
 418         __u16   s_magic;                /* Magic signature */
 419         __u16   s_state;                /* File system state */
 420         __u16   s_errors;               /* Behaviour when detecting errors */
 421         __u16   s_minor_rev_level;      /* minor revision level */
 422 /*40*/  __u32   s_lastcheck;            /* time of last check */
 423         __u32   s_checkinterval;        /* max. time between checks */
 424         __u32   s_creator_os;           /* OS */
 425         __u32   s_rev_level;            /* Revision level */
 426 /*50*/  __u16   s_def_resuid;           /* Default uid for reserved blocks */
 427         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 428         /*
 429          * These fields are for EXT3_DYNAMIC_REV superblocks only.
 430          *
 431          * Note: the difference between the compatible feature set and
 432          * the incompatible feature set is that if there is a bit set
 433          * in the incompatible feature set that the kernel doesn't
 434          * know about, it should refuse to mount the filesystem.
 435          *
 436          * e2fsck's requirements are more strict; if it doesn't know
 437          * about a feature in either the compatible or incompatible
 438          * feature set, it must abort and not try to meddle with
 439          * things it doesn't understand...
 440          */
 441         __u32   s_first_ino;            /* First non-reserved inode */
 442         __u16   s_inode_size;           /* size of inode structure */
 443         __u16   s_block_group_nr;       /* block group # of this superblock */
 444         __u32   s_feature_compat;       /* compatible feature set */
 445 /*60*/  __u32   s_feature_incompat;     /* incompatible feature set */
 446         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 447 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 448 /*78*/  char    s_volume_name[16];      /* volume name */
 449 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 450 /*C8*/  __u32   s_algorithm_usage_bitmap; /* For compression */
 451         /*
 452          * Performance hints.  Directory preallocation should only
 453          * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 454          */
 455         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 456         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 457         __u16   s_reserved_gdt_blocks;  /* Per group desc for online growth */
 458         /*
 459          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 460          */
 461 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 462 /*E0*/  __u32   s_journal_inum;         /* inode number of journal file */
 463         __u32   s_journal_dev;          /* device number of journal file */
 464         __u32   s_last_orphan;          /* start of list of inodes to delete */
 465         __u32   s_hash_seed[4];         /* HTREE hash seed */
 466         __u8    s_def_hash_version;     /* Default hash version to use */
 467         __u8    s_reserved_char_pad;
 468         __u16   s_reserved_word_pad;
 469         __u32   s_default_mount_opts;
 470         __u32   s_first_meta_bg;        /* First metablock block group */
 471         __u32   s_reserved[190];        /* Padding to the end of the block */
 472 };
 473
 474 #ifdef __KERNEL__
 475 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
 476 {
 477         return sb->s_fs_info;
 478 }
 479 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
 480 {
 481         return container_of(inode, struct ext3_inode_info, vfs_inode);
 482 }
 483 #else
 484 /* Assume that user mode programs are passing in an ext3fs superblock, not
 485  * a kernel struct super_block.  This will allow us to call the feature-test
 486  * macros from user land. */
 487 #define EXT3_SB(sb)     (sb)
 488 #endif
 489
 490 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
 491
 492 /*
 493  * Codes for operating systems
 494  */
 495 #define EXT3_OS_LINUX           0
 496 #define EXT3_OS_HURD            1
 497 #define EXT3_OS_MASIX           2
 498 #define EXT3_OS_FREEBSD         3
 499 #define EXT3_OS_LITES           4
 500
 501 /*
 502  * Revision levels
 503  */
 504 #define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
 505 #define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 506
 507 #define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
 508 #define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
 509
 510 #define EXT3_GOOD_OLD_INODE_SIZE 128
 511
 512 /*
 513  * Feature set definitions
 514  */
 515
 516 #define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
 517         ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 518 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 519         ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 520 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 521         ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 522 #define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
 523         EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 524 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 525         EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 526 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
 527         EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 528 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 529         EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 530 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 531         EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 532 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 533         EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 534
 535 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 536 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 537 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 538 #define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
 539 #define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
 540 #define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
 541
 542 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 543 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 544 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 545
 546 #define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
 547 #define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
 548 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 549 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 550 #define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
 551
 552 #define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 553 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
 554                                          EXT3_FEATURE_INCOMPAT_RECOVER| \
 555                                          EXT3_FEATURE_INCOMPAT_META_BG)
 556 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 557                                          EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
 558                                          EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
 559
 560 /*
 561  * Default values for user and/or group using reserved blocks
 562  */
 563 #define EXT3_DEF_RESUID         0
 564 #define EXT3_DEF_RESGID         0
 565
 566 /*
 567  * Default mount options
 568  */
 569 #define EXT3_DEFM_DEBUG         0x0001
 570 #define EXT3_DEFM_BSDGROUPS     0x0002
 571 #define EXT3_DEFM_XATTR_USER    0x0004
 572 #define EXT3_DEFM_ACL           0x0008
 573 #define EXT3_DEFM_UID16         0x0010
 574 #define EXT3_DEFM_JMODE         0x0060
 575 #define EXT3_DEFM_JMODE_DATA    0x0020
 576 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 577 #define EXT3_DEFM_JMODE_WBACK   0x0060
 578
 579 /*
 580  * Structure of a directory entry
 581  */
 582 #define EXT3_NAME_LEN 255
 583
 584 struct ext3_dir_entry {
 585         __u32   inode;                  /* Inode number */
 586         __u16   rec_len;                /* Directory entry length */
 587         __u16   name_len;               /* Name length */
 588         char    name[EXT3_NAME_LEN];    /* File name */
 589 };
 590
 591 /*
 592  * The new version of the directory entry.  Since EXT3 structures are
 593  * stored in intel byte order, and the name_len field could never be
 594  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 595  * file_type field.
 596  */
 597 struct ext3_dir_entry_2 {
 598         __u32   inode;                  /* Inode number */
 599         __u16   rec_len;                /* Directory entry length */
 600         __u8    name_len;               /* Name length */
 601         __u8    file_type;
 602         char    name[EXT3_NAME_LEN];    /* File name */
 603 };
 604
 605 /*
 606  * Ext3 directory file types.  Only the low 3 bits are used.  The
 607  * other bits are reserved for now.
 608  */
 609 #define EXT3_FT_UNKNOWN         0
 610 #define EXT3_FT_REG_FILE        1
 611 #define EXT3_FT_DIR             2
 612 #define EXT3_FT_CHRDEV          3
 613 #define EXT3_FT_BLKDEV          4
 614 #define EXT3_FT_FIFO            5
 615 #define EXT3_FT_SOCK            6
 616 #define EXT3_FT_SYMLINK         7
 617
 618 #define EXT3_FT_MAX             8
 619
 620 /*
 621  * EXT3_DIR_PAD defines the directory entries boundaries
 622  *
 623  * NOTE: It must be a multiple of 4
 624  */
 625 #define EXT3_DIR_PAD                    4
 626 #define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
 627 #define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
 628                                          ~EXT3_DIR_ROUND)
 629 /*
 630  * Hash Tree Directory indexing
 631  * (c) Daniel Phillips, 2001
 632  */
 633
 634 #ifdef CONFIG_EXT3_INDEX
 635   #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
 636                                               EXT3_FEATURE_COMPAT_DIR_INDEX) && \
 637                       (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
 638 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
 639 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 640 #else
 641   #define is_dx(dir) 0
 642 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
 643 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
 644 #endif
 645
 646 /* Legal values for the dx_root hash_version field: */
 647
 648 #define DX_HASH_LEGACY          0
 649 #define DX_HASH_HALF_MD4        1
 650 #define DX_HASH_TEA             2
 651
 652 /* hash info structure used by the directory hash */
 653 struct dx_hash_info
 654 {
 655         u32             hash;
 656         u32             minor_hash;
 657         int             hash_version;
 658         u32             *seed;
 659 };
 660
 661 #define EXT3_HTREE_EOF  0x7fffffff
 662
 663 #ifdef __KERNEL__
 664 /*
 665  * Control parameters used by ext3_htree_next_block
 666  */
 667 #define HASH_NB_ALWAYS          1
 668
 669
 670 /*
 671  * Describe an inode's exact location on disk and in memory
 672  */
 673 struct ext3_iloc
 674 {
 675         struct buffer_head *bh;
 676         unsigned long offset;
 677         unsigned long block_group;
 678 };
 679
 680 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
 681 {
 682         return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
 683 }
 684
 685 /*
 686  * This structure is stuffed into the struct file's private_data field
 687  * for directories.  It is where we put information so that we can do
 688  * readdir operations in hash tree order.
 689  */
 690 struct dir_private_info {
 691         struct rb_root  root;
 692         struct rb_node  *curr_node;
 693         struct fname    *extra_fname;
 694         loff_t          last_pos;
 695         __u32           curr_hash;
 696         __u32           curr_minor_hash;
 697         __u32           next_hash;
 698 };
 699
 700 /*
 701  * Special error return code only used by dx_probe() and its callers.
 702  */
 703 #define ERR_BAD_DX_DIR  -75000
 704
 705 /*
 706  * Function prototypes
 707  */
 708
 709 /*
 710  * Ok, these declarations are also in <linux/kernel.h> but none of the
 711  * ext3 source programs needs to include it so they are duplicated here.
 712  */
 713 # define NORET_TYPE    /**/
 714 # define ATTRIB_NORET  __attribute__((noreturn))
 715 # define NORET_AND     noreturn,
 716
 717 /* balloc.c */
 718 extern int ext3_bg_has_super(struct super_block *sb, int group);
 719 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
 720 extern int ext3_new_block (handle_t *, struct inode *, unsigned long, int *);
 721 extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
 722                               unsigned long);
 723 extern unsigned long ext3_count_free_blocks (struct super_block *);
 724 extern void ext3_check_blocks_bitmap (struct super_block *);
 725 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
 726                                                     unsigned int block_group,
 727                                                     struct buffer_head ** bh);
 728 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
 729
 730 /* dir.c */
 731 extern int ext3_check_dir_entry(const char *, struct inode *,
 732                                 struct ext3_dir_entry_2 *,
 733                                 struct buffer_head *, unsigned long);
 734 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
 735                                     __u32 minor_hash,
 736                                     struct ext3_dir_entry_2 *dirent);
 737 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
 738
 739 /* fsync.c */
 740 extern int ext3_sync_file (struct file *, struct dentry *, int);
 741
 742 /* hash.c */
 743 extern int ext3fs_dirhash(const char *name, int len, struct
 744                           dx_hash_info *hinfo);
 745
 746 /* ialloc.c */
 747 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
 748 extern void ext3_free_inode (handle_t *, struct inode *);
 749 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
 750 extern unsigned long ext3_count_free_inodes (struct super_block *);
 751 extern unsigned long ext3_count_dirs (struct super_block *);
 752 extern void ext3_check_inodes_bitmap (struct super_block *);
 753 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
 754
 755
 756 /* inode.c */
 757 extern int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
 758 extern struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
 759 extern struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
 760
 761 extern void ext3_read_inode (struct inode *);
 762 extern void ext3_write_inode (struct inode *, int);
 763 extern int  ext3_setattr (struct dentry *, struct iattr *);
 764 extern void ext3_put_inode (struct inode *);
 765 extern void ext3_delete_inode (struct inode *);
 766 extern int  ext3_sync_inode (handle_t *, struct inode *);
 767 extern void ext3_discard_prealloc (struct inode *);
 768 extern void ext3_discard_reservation (struct inode *);
 769 extern void ext3_dirty_inode(struct inode *);
 770 extern int ext3_change_inode_journal_flag(struct inode *, int);
 771 extern void ext3_truncate (struct inode *);
 772 extern void ext3_set_inode_flags(struct inode *);
 773 extern void ext3_set_aops(struct inode *inode);
 774
 775 /* ioctl.c */
 776 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
 777                        unsigned long);
 778
 779 /* namei.c */
 780 extern int ext3_orphan_add(handle_t *, struct inode *);
 781 extern int ext3_orphan_del(handle_t *, struct inode *);
 782 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 783                                 __u32 start_minor_hash, __u32 *next_hash);
 784
 785 /* resize.c */
 786 extern int ext3_group_add(struct super_block *sb,
 787                                 struct ext3_new_group_data *input);
 788 extern int ext3_group_extend(struct super_block *sb,
 789                                 struct ext3_super_block *es,
 790                                 unsigned long n_blocks_count);
 791
 792 /* super.c */
 793 extern void ext3_error (struct super_block *, const char *, const char *, ...)
 794         __attribute__ ((format (printf, 3, 4)));
 795 extern void __ext3_std_error (struct super_block *, const char *, int);
 796 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
 797         __attribute__ ((format (printf, 3, 4)));
 798 extern NORET_TYPE void ext3_panic (struct super_block *, const char *,
 799                                    const char *, ...)
 800         __attribute__ ((NORET_AND format (printf, 3, 4)));
 801 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
 802         __attribute__ ((format (printf, 3, 4)));
 803 extern void ext3_update_dynamic_rev (struct super_block *sb);
 804 extern void ext3_put_super (struct super_block *);
 805 extern void ext3_write_super (struct super_block *);
 806 extern void ext3_write_super_lockfs (struct super_block *);
 807 extern void ext3_unlockfs (struct super_block *);
 808 extern int ext3_remount (struct super_block *, int *, char *);
 809 extern int ext3_statfs (struct super_block *, struct kstatfs *);
 810
 811 #define ext3_std_error(sb, errno)                               \
 812 do {                                                            \
 813         if ((errno))                                            \
 814                 __ext3_std_error((sb), __FUNCTION__, (errno));  \
 815 } while (0)
 816 extern const char *ext3_decode_error(struct super_block *sb, int errno, char nbuf[16]);
 817
 818 /*
 819  * Inodes and files operations
 820  */
 821
 822 /* dir.c */
 823 extern struct file_operations ext3_dir_operations;
 824
 825 /* file.c */
 826 extern struct inode_operations ext3_file_inode_operations;
 827 extern struct file_operations ext3_file_operations;
 828
 829 /* namei.c */
 830 extern struct inode_operations ext3_dir_inode_operations;
 831 extern struct inode_operations ext3_special_inode_operations;
 832
 833 /* symlink.c */
 834 extern struct inode_operations ext3_symlink_inode_operations;
 835 extern struct inode_operations ext3_fast_symlink_inode_operations;
 836
 837
 838 #endif  /* __KERNEL__ */
 839
 840 #endif  /* _LINUX_EXT3_FS_H */