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
  21 /*
  22  * The second extended filesystem constants/structures
  23  */
  24
  25 /*
  26  * Define EXT3FS_DEBUG to produce debug messages
  27  */
  28 #undef EXT3FS_DEBUG
  29
  30 /*
  31  * Define EXT3_RESERVATION to reserve data blocks for expanding files
  32  */
  33 #define EXT3_DEFAULT_RESERVE_BLOCKS     8
  34 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  35 #define EXT3_MAX_RESERVE_BLOCKS         1027
  36 #define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
  37 /*
  38  * Always enable hashed directories
  39  */
  40 #define CONFIG_EXT3_INDEX
  41
  42 /*
  43  * Debug code
  44  */
  45 #ifdef EXT3FS_DEBUG
  46 #define ext3_debug(f, a...)                                             \
  47         do {                                                            \
  48                 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
  49                         __FILE__, __LINE__, __FUNCTION__);              \
  50                 printk (KERN_DEBUG f, ## a);                            \
  51         } while (0)
  52 #else
  53 #define ext3_debug(f, a...)     do {} while (0)
  54 #endif
  55
  56 /*
  57  * Special inodes numbers
  58  */
  59 #define EXT3_BAD_INO             1      /* Bad blocks inode */
  60 #define EXT3_ROOT_INO            2      /* Root inode */
  61 #define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
  62 #define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
  63 #define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
  64 #define EXT3_JOURNAL_INO         8      /* Journal inode */
  65
  66 /* First non-reserved inode for old ext3 filesystems */
  67 #define EXT3_GOOD_OLD_FIRST_INO 11
  68
  69 /*
  70  * The second extended file system magic number
  71  */
  72 #define EXT3_SUPER_MAGIC        0xEF53
  73
  74 /*
  75  * Maximal count of links to a file
  76  */
  77 #define EXT3_LINK_MAX           32000
  78
  79 /*
  80  * Macro-instructions used to manage several block sizes
  81  */
  82 #define EXT3_MIN_BLOCK_SIZE             1024
  83 #define EXT3_MAX_BLOCK_SIZE             4096
  84 #define EXT3_MIN_BLOCK_LOG_SIZE           10
  85 #ifdef __KERNEL__
  86 # define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)
  87 #else
  88 # define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  89 #endif
  90 #define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
  91 #ifdef __KERNEL__
  92 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  93 #else
  94 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  95 #endif
  96 #ifdef __KERNEL__
  97 #define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
  98 #define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
  99 #define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
 100 #else
 101 #define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 102                                  EXT3_GOOD_OLD_INODE_SIZE : \
 103                                  (s)->s_inode_size)
 104 #define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 105                                  EXT3_GOOD_OLD_FIRST_INO : \
 106                                  (s)->s_first_ino)
 107 #endif
 108
 109 /*
 110  * Macro-instructions used to manage fragments
 111  */
 112 #define EXT3_MIN_FRAG_SIZE              1024
 113 #define EXT3_MAX_FRAG_SIZE              4096
 114 #define EXT3_MIN_FRAG_LOG_SIZE            10
 115 #ifdef __KERNEL__
 116 # define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)
 117 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)
 118 #else
 119 # define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 120 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
 121 #endif
 122
 123 /*
 124  * Structure of a blocks group descriptor
 125  */
 126 struct ext3_group_desc
 127 {
 128         __le32  bg_block_bitmap;                /* Blocks bitmap block */
 129         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 130         __le32  bg_inode_table;         /* Inodes table block */
 131         __le16  bg_free_blocks_count;   /* Free blocks count */
 132         __le16  bg_free_inodes_count;   /* Free inodes count */
 133         __le16  bg_used_dirs_count;     /* Directories count */
 134         __u16   bg_pad;
 135         __le32  bg_reserved[3];
 136 };
 137
 138 /*
 139  * Macro-instructions used to manage group descriptors
 140  */
 141 #ifdef __KERNEL__
 142 # define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)
 143 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)
 144 # define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)
 145 # define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)
 146 #else
 147 # define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 148 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
 149 # define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 150 #endif
 151
 152 /*
 153  * Constants relative to the data blocks
 154  */
 155 #define EXT3_NDIR_BLOCKS                12
 156 #define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
 157 #define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
 158 #define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
 159 #define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
 160
 161 /*
 162  * Inode flags
 163  */
 164 #define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
 165 #define EXT3_UNRM_FL                    0x00000002 /* Undelete */
 166 #define EXT3_COMPR_FL                   0x00000004 /* Compress file */
 167 #define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
 168 #define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
 169 #define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
 170 #define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
 171 #define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
 172 /* Reserved for compression usage... */
 173 #define EXT3_DIRTY_FL                   0x00000100
 174 #define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 175 #define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
 176 #define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
 177 /* End compression flags --- maybe not all used */
 178 #define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
 179 #define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
 180 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 181 #define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 182 #define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 183 #define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 184 #define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
 185
 186 #define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 187 #define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 188
 189 /*
 190  * Inode dynamic state flags
 191  */
 192 #define EXT3_STATE_JDATA                0x00000001 /* journaled data exists */
 193 #define EXT3_STATE_NEW                  0x00000002 /* inode is newly created */
 194 #define EXT3_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 195
 196 /* Used to pass group descriptor data when online resize is done */
 197 struct ext3_new_group_input {
 198         __u32 group;            /* Group number for this data */
 199         __u32 block_bitmap;     /* Absolute block number of block bitmap */
 200         __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
 201         __u32 inode_table;      /* Absolute block number of inode table start */
 202         __u32 blocks_count;     /* Total number of blocks in this group */
 203         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 204         __u16 unused;
 205 };
 206
 207 /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
 208 struct ext3_new_group_data {
 209         __u32 group;
 210         __u32 block_bitmap;
 211         __u32 inode_bitmap;
 212         __u32 inode_table;
 213         __u32 blocks_count;
 214         __u16 reserved_blocks;
 215         __u16 unused;
 216         __u32 free_blocks_count;
 217 };
 218
 219
 220 /*
 221  * ioctl commands
 222  */
 223 #define EXT3_IOC_GETFLAGS               _IOR('f', 1, long)
 224 #define EXT3_IOC_SETFLAGS               _IOW('f', 2, long)
 225 #define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
 226 #define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
 227 #define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 228 #define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)
 229 #define EXT3_IOC_GETVERSION_OLD         _IOR('v', 1, long)
 230 #define EXT3_IOC_SETVERSION_OLD         _IOW('v', 2, long)
 231 #ifdef CONFIG_JBD_DEBUG
 232 #define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 233 #endif
 234 #define EXT3_IOC_GETRSVSZ               _IOR('f', 5, long)
 235 #define EXT3_IOC_SETRSVSZ               _IOW('f', 6, long)
 236
 237 /*
 238  *  Mount options
 239  */
 240 struct ext3_mount_options {
 241         unsigned long s_mount_opt;
 242         uid_t s_resuid;
 243         gid_t s_resgid;
 244         unsigned long s_commit_interval;
 245 #ifdef CONFIG_QUOTA
 246         int s_jquota_fmt;
 247         char *s_qf_names[MAXQUOTAS];
 248 #endif
 249 };
 250
 251 /*
 252  * Structure of an inode on the disk
 253  */
 254 struct ext3_inode {
 255         __le16  i_mode;         /* File mode */
 256         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 257         __le32  i_size;         /* Size in bytes */
 258         __le32  i_atime;        /* Access time */
 259         __le32  i_ctime;        /* Creation time */
 260         __le32  i_mtime;        /* Modification time */
 261         __le32  i_dtime;        /* Deletion Time */
 262         __le16  i_gid;          /* Low 16 bits of Group Id */
 263         __le16  i_links_count;  /* Links count */
 264         __le32  i_blocks;       /* Blocks count */
 265         __le32  i_flags;        /* File flags */
 266         union {
 267                 struct {
 268                         __u32  l_i_reserved1;
 269                 } linux1;
 270                 struct {
 271                         __u32  h_i_translator;
 272                 } hurd1;
 273                 struct {
 274                         __u32  m_i_reserved1;
 275                 } masix1;
 276         } osd1;                         /* OS dependent 1 */
 277         __le32  i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
 278         __le32  i_generation;   /* File version (for NFS) */
 279         __le32  i_file_acl;     /* File ACL */
 280         __le32  i_dir_acl;      /* Directory ACL */
 281         __le32  i_faddr;        /* Fragment address */
 282         union {
 283                 struct {
 284                         __u8    l_i_frag;       /* Fragment number */
 285                         __u8    l_i_fsize;      /* Fragment size */
 286                         __u16   i_pad1;
 287                         __le16  l_i_uid_high;   /* these 2 fields    */
 288                         __le16  l_i_gid_high;   /* were reserved2[0] */
 289                         __u32   l_i_reserved2;
 290                 } linux2;
 291                 struct {
 292                         __u8    h_i_frag;       /* Fragment number */
 293                         __u8    h_i_fsize;      /* Fragment size */
 294                         __u16   h_i_mode_high;
 295                         __u16   h_i_uid_high;
 296                         __u16   h_i_gid_high;
 297                         __u32   h_i_author;
 298                 } hurd2;
 299                 struct {
 300                         __u8    m_i_frag;       /* Fragment number */
 301                         __u8    m_i_fsize;      /* Fragment size */
 302                         __u16   m_pad1;
 303                         __u32   m_i_reserved2[2];
 304                 } masix2;
 305         } osd2;                         /* OS dependent 2 */
 306         __le16  i_extra_isize;
 307         __le16  i_pad1;
 308 };
 309
 310 #define i_size_high     i_dir_acl
 311
 312 #if defined(__KERNEL__) || defined(__linux__)
 313 #define i_reserved1     osd1.linux1.l_i_reserved1
 314 #define i_frag          osd2.linux2.l_i_frag
 315 #define i_fsize         osd2.linux2.l_i_fsize
 316 #define i_uid_low       i_uid
 317 #define i_gid_low       i_gid
 318 #define i_uid_high      osd2.linux2.l_i_uid_high
 319 #define i_gid_high      osd2.linux2.l_i_gid_high
 320 #define i_reserved2     osd2.linux2.l_i_reserved2
 321
 322 #elif defined(__GNU__)
 323
 324 #define i_translator    osd1.hurd1.h_i_translator
 325 #define i_frag          osd2.hurd2.h_i_frag;
 326 #define i_fsize         osd2.hurd2.h_i_fsize;
 327 #define i_uid_high      osd2.hurd2.h_i_uid_high
 328 #define i_gid_high      osd2.hurd2.h_i_gid_high
 329 #define i_author        osd2.hurd2.h_i_author
 330
 331 #elif defined(__masix__)
 332
 333 #define i_reserved1     osd1.masix1.m_i_reserved1
 334 #define i_frag          osd2.masix2.m_i_frag
 335 #define i_fsize         osd2.masix2.m_i_fsize
 336 #define i_reserved2     osd2.masix2.m_i_reserved2
 337
 338 #endif /* defined(__KERNEL__) || defined(__linux__) */
 339
 340 /*
 341  * File system states
 342  */
 343 #define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
 344 #define EXT3_ERROR_FS                   0x0002  /* Errors detected */
 345 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 346
 347 /*
 348  * Mount flags
 349  */
 350 #define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 351 #define EXT3_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 352 #define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 353 #define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 354 #define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 355 #define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 356 #define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 357 #define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 358 #define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 359 #define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
 360 #define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 361 #define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 362 #define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 363 #define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 364 #define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 365 #define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 366 #define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 367 #define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 368 #define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
 369 #define EXT3_MOUNT_BARRIER              0x20000 /* Use block barriers */
 370 #define EXT3_MOUNT_NOBH                 0x40000 /* No bufferheads */
 371 #define EXT3_MOUNT_QUOTA                0x80000 /* Some quota option set */
 372 #define EXT3_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 373 #define EXT3_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 374
 375 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
 376 #ifndef _LINUX_EXT2_FS_H
 377 #define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
 378 #define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
 379 #define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
 380                                          EXT3_MOUNT_##opt)
 381 #else
 382 #define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
 383 #define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
 384 #define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
 385 #endif
 386
 387 #define ext3_set_bit                    ext2_set_bit
 388 #define ext3_set_bit_atomic             ext2_set_bit_atomic
 389 #define ext3_clear_bit                  ext2_clear_bit
 390 #define ext3_clear_bit_atomic           ext2_clear_bit_atomic
 391 #define ext3_test_bit                   ext2_test_bit
 392 #define ext3_find_first_zero_bit        ext2_find_first_zero_bit
 393 #define ext3_find_next_zero_bit         ext2_find_next_zero_bit
 394
 395 /*
 396  * Maximal mount counts between two filesystem checks
 397  */
 398 #define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 399 #define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 400
 401 /*
 402  * Behaviour when detecting errors
 403  */
 404 #define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
 405 #define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
 406 #define EXT3_ERRORS_PANIC               3       /* Panic */
 407 #define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
 408
 409 /*
 410  * Structure of the super block
 411  */
 412 struct ext3_super_block {
 413 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 414         __le32  s_blocks_count;         /* Blocks count */
 415         __le32  s_r_blocks_count;       /* Reserved blocks count */
 416         __le32  s_free_blocks_count;    /* Free blocks count */
 417 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 418         __le32  s_first_data_block;     /* First Data Block */
 419         __le32  s_log_block_size;       /* Block size */
 420         __le32  s_log_frag_size;        /* Fragment size */
 421 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 422         __le32  s_frags_per_group;      /* # Fragments per group */
 423         __le32  s_inodes_per_group;     /* # Inodes per group */
 424         __le32  s_mtime;                /* Mount time */
 425 /*30*/  __le32  s_wtime;                /* Write time */
 426         __le16  s_mnt_count;            /* Mount count */
 427         __le16  s_max_mnt_count;        /* Maximal mount count */
 428         __le16  s_magic;                /* Magic signature */
 429         __le16  s_state;                /* File system state */
 430         __le16  s_errors;               /* Behaviour when detecting errors */
 431         __le16  s_minor_rev_level;      /* minor revision level */
 432 /*40*/  __le32  s_lastcheck;            /* time of last check */
 433         __le32  s_checkinterval;        /* max. time between checks */
 434         __le32  s_creator_os;           /* OS */
 435         __le32  s_rev_level;            /* Revision level */
 436 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 437         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 438         /*
 439          * These fields are for EXT3_DYNAMIC_REV superblocks only.
 440          *
 441          * Note: the difference between the compatible feature set and
 442          * the incompatible feature set is that if there is a bit set
 443          * in the incompatible feature set that the kernel doesn't
 444          * know about, it should refuse to mount the filesystem.
 445          *
 446          * e2fsck's requirements are more strict; if it doesn't know
 447          * about a feature in either the compatible or incompatible
 448          * feature set, it must abort and not try to meddle with
 449          * things it doesn't understand...
 450          */
 451         __le32  s_first_ino;            /* First non-reserved inode */
 452         __le16   s_inode_size;          /* size of inode structure */
 453         __le16  s_block_group_nr;       /* block group # of this superblock */
 454         __le32  s_feature_compat;       /* compatible feature set */
 455 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 456         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 457 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 458 /*78*/  char    s_volume_name[16];      /* volume name */
 459 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 460 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 461         /*
 462          * Performance hints.  Directory preallocation should only
 463          * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 464          */
 465         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 466         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 467         __u16   s_reserved_gdt_blocks;  /* Per group desc for online growth */
 468         /*
 469          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 470          */
 471 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 472 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 473         __le32  s_journal_dev;          /* device number of journal file */
 474         __le32  s_last_orphan;          /* start of list of inodes to delete */
 475         __le32  s_hash_seed[4];         /* HTREE hash seed */
 476         __u8    s_def_hash_version;     /* Default hash version to use */
 477         __u8    s_reserved_char_pad;
 478         __u16   s_reserved_word_pad;
 479         __le32  s_default_mount_opts;
 480         __le32  s_first_meta_bg;        /* First metablock block group */
 481         __u32   s_reserved[190];        /* Padding to the end of the block */
 482 };
 483
 484 #ifdef __KERNEL__
 485 #include <linux/ext3_fs_i.h>
 486 #include <linux/ext3_fs_sb.h>
 487 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
 488 {
 489         return sb->s_fs_info;
 490 }
 491 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
 492 {
 493         return container_of(inode, struct ext3_inode_info, vfs_inode);
 494 }
 495
 496 static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
 497 {
 498         return ino == EXT3_ROOT_INO ||
 499                 ino == EXT3_JOURNAL_INO ||
 500                 ino == EXT3_RESIZE_INO ||
 501                 (ino >= EXT3_FIRST_INO(sb) &&
 502                  ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
 503 }
 504 #else
 505 /* Assume that user mode programs are passing in an ext3fs superblock, not
 506  * a kernel struct super_block.  This will allow us to call the feature-test
 507  * macros from user land. */
 508 #define EXT3_SB(sb)     (sb)
 509 #endif
 510
 511 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
 512
 513 /*
 514  * Codes for operating systems
 515  */
 516 #define EXT3_OS_LINUX           0
 517 #define EXT3_OS_HURD            1
 518 #define EXT3_OS_MASIX           2
 519 #define EXT3_OS_FREEBSD         3
 520 #define EXT3_OS_LITES           4
 521
 522 /*
 523  * Revision levels
 524  */
 525 #define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
 526 #define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 527
 528 #define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
 529 #define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
 530
 531 #define EXT3_GOOD_OLD_INODE_SIZE 128
 532
 533 /*
 534  * Feature set definitions
 535  */
 536
 537 #define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
 538         ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 539 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 540         ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 541 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 542         ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 543 #define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
 544         EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 545 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 546         EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 547 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
 548         EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 549 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 550         EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 551 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 552         EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 553 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 554         EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 555
 556 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 557 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 558 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 559 #define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
 560 #define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
 561 #define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
 562
 563 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 564 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 565 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 566
 567 #define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
 568 #define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
 569 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 570 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 571 #define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
 572
 573 #define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 574 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
 575                                          EXT3_FEATURE_INCOMPAT_RECOVER| \
 576                                          EXT3_FEATURE_INCOMPAT_META_BG)
 577 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 578                                          EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
 579                                          EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
 580
 581 /*
 582  * Default values for user and/or group using reserved blocks
 583  */
 584 #define EXT3_DEF_RESUID         0
 585 #define EXT3_DEF_RESGID         0
 586
 587 /*
 588  * Default mount options
 589  */
 590 #define EXT3_DEFM_DEBUG         0x0001
 591 #define EXT3_DEFM_BSDGROUPS     0x0002
 592 #define EXT3_DEFM_XATTR_USER    0x0004
 593 #define EXT3_DEFM_ACL           0x0008
 594 #define EXT3_DEFM_UID16         0x0010
 595 #define EXT3_DEFM_JMODE         0x0060
 596 #define EXT3_DEFM_JMODE_DATA    0x0020
 597 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 598 #define EXT3_DEFM_JMODE_WBACK   0x0060
 599
 600 /*
 601  * Structure of a directory entry
 602  */
 603 #define EXT3_NAME_LEN 255
 604
 605 struct ext3_dir_entry {
 606         __le32  inode;                  /* Inode number */
 607         __le16  rec_len;                /* Directory entry length */
 608         __le16  name_len;               /* Name length */
 609         char    name[EXT3_NAME_LEN];    /* File name */
 610 };
 611
 612 /*
 613  * The new version of the directory entry.  Since EXT3 structures are
 614  * stored in intel byte order, and the name_len field could never be
 615  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 616  * file_type field.
 617  */
 618 struct ext3_dir_entry_2 {
 619         __le32  inode;                  /* Inode number */
 620         __le16  rec_len;                /* Directory entry length */
 621         __u8    name_len;               /* Name length */
 622         __u8    file_type;
 623         char    name[EXT3_NAME_LEN];    /* File name */
 624 };
 625
 626 /*
 627  * Ext3 directory file types.  Only the low 3 bits are used.  The
 628  * other bits are reserved for now.
 629  */
 630 #define EXT3_FT_UNKNOWN         0
 631 #define EXT3_FT_REG_FILE        1
 632 #define EXT3_FT_DIR             2
 633 #define EXT3_FT_CHRDEV          3
 634 #define EXT3_FT_BLKDEV          4
 635 #define EXT3_FT_FIFO            5
 636 #define EXT3_FT_SOCK            6
 637 #define EXT3_FT_SYMLINK         7
 638
 639 #define EXT3_FT_MAX             8
 640
 641 /*
 642  * EXT3_DIR_PAD defines the directory entries boundaries
 643  *
 644  * NOTE: It must be a multiple of 4
 645  */
 646 #define EXT3_DIR_PAD                    4
 647 #define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
 648 #define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
 649                                          ~EXT3_DIR_ROUND)
 650 /*
 651  * Hash Tree Directory indexing
 652  * (c) Daniel Phillips, 2001
 653  */
 654
 655 #ifdef CONFIG_EXT3_INDEX
 656   #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
 657                                               EXT3_FEATURE_COMPAT_DIR_INDEX) && \
 658                       (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
 659 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
 660 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 661 #else
 662   #define is_dx(dir) 0
 663 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
 664 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
 665 #endif
 666
 667 /* Legal values for the dx_root hash_version field: */
 668
 669 #define DX_HASH_LEGACY          0
 670 #define DX_HASH_HALF_MD4        1
 671 #define DX_HASH_TEA             2
 672
 673 #ifdef __KERNEL__
 674
 675 /* hash info structure used by the directory hash */
 676 struct dx_hash_info
 677 {
 678         u32             hash;
 679         u32             minor_hash;
 680         int             hash_version;
 681         u32             *seed;
 682 };
 683
 684 #define EXT3_HTREE_EOF  0x7fffffff
 685
 686 /*
 687  * Control parameters used by ext3_htree_next_block
 688  */
 689 #define HASH_NB_ALWAYS          1
 690
 691
 692 /*
 693  * Describe an inode's exact location on disk and in memory
 694  */
 695 struct ext3_iloc
 696 {
 697         struct buffer_head *bh;
 698         unsigned long offset;
 699         unsigned long block_group;
 700 };
 701
 702 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
 703 {
 704         return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
 705 }
 706
 707 /*
 708  * This structure is stuffed into the struct file's private_data field
 709  * for directories.  It is where we put information so that we can do
 710  * readdir operations in hash tree order.
 711  */
 712 struct dir_private_info {
 713         struct rb_root  root;
 714         struct rb_node  *curr_node;
 715         struct fname    *extra_fname;
 716         loff_t          last_pos;
 717         __u32           curr_hash;
 718         __u32           curr_minor_hash;
 719         __u32           next_hash;
 720 };
 721
 722 /* calculate the first block number of the group */
 723 static inline ext3_fsblk_t
 724 ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
 725 {
 726         return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
 727                 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
 728 }
 729
 730 /*
 731  * Special error return code only used by dx_probe() and its callers.
 732  */
 733 #define ERR_BAD_DX_DIR  -75000
 734
 735 /*
 736  * Function prototypes
 737  */
 738
 739 /*
 740  * Ok, these declarations are also in <linux/kernel.h> but none of the
 741  * ext3 source programs needs to include it so they are duplicated here.
 742  */
 743 # define NORET_TYPE    /**/
 744 # define ATTRIB_NORET  __attribute__((noreturn))
 745 # define NORET_AND     noreturn,
 746
 747 /* balloc.c */
 748 extern int ext3_bg_has_super(struct super_block *sb, int group);
 749 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
 750 extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
 751                         ext3_fsblk_t goal, int *errp);
 752 extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
 753                         ext3_fsblk_t goal, unsigned long *count, int *errp);
 754 extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
 755                         ext3_fsblk_t block, unsigned long count);
 756 extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
 757                                  ext3_fsblk_t block, unsigned long count,
 758                                 unsigned long *pdquot_freed_blocks);
 759 extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
 760 extern void ext3_check_blocks_bitmap (struct super_block *);
 761 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
 762                                                     unsigned int block_group,
 763                                                     struct buffer_head ** bh);
 764 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
 765 extern void ext3_init_block_alloc_info(struct inode *);
 766 extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
 767
 768 /* dir.c */
 769 extern int ext3_check_dir_entry(const char *, struct inode *,
 770                                 struct ext3_dir_entry_2 *,
 771                                 struct buffer_head *, unsigned long);
 772 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
 773                                     __u32 minor_hash,
 774                                     struct ext3_dir_entry_2 *dirent);
 775 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
 776
 777 /* fsync.c */
 778 extern int ext3_sync_file (struct file *, struct dentry *, int);
 779
 780 /* hash.c */
 781 extern int ext3fs_dirhash(const char *name, int len, struct
 782                           dx_hash_info *hinfo);
 783
 784 /* ialloc.c */
 785 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
 786 extern void ext3_free_inode (handle_t *, struct inode *);
 787 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
 788 extern unsigned long ext3_count_free_inodes (struct super_block *);
 789 extern unsigned long ext3_count_dirs (struct super_block *);
 790 extern void ext3_check_inodes_bitmap (struct super_block *);
 791 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
 792
 793
 794 /* inode.c */
 795 int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
 796                 struct buffer_head *bh, ext3_fsblk_t blocknr);
 797 struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
 798 struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
 799 int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
 800         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
 801         int create, int extend_disksize);
 802
 803 extern void ext3_read_inode (struct inode *);
 804 extern int  ext3_write_inode (struct inode *, int);
 805 extern int  ext3_setattr (struct dentry *, struct iattr *);
 806 extern void ext3_delete_inode (struct inode *);
 807 extern int  ext3_sync_inode (handle_t *, struct inode *);
 808 extern void ext3_discard_reservation (struct inode *);
 809 extern void ext3_dirty_inode(struct inode *);
 810 extern int ext3_change_inode_journal_flag(struct inode *, int);
 811 extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
 812 extern void ext3_truncate (struct inode *);
 813 extern void ext3_set_inode_flags(struct inode *);
 814 extern void ext3_set_aops(struct inode *inode);
 815
 816 /* ioctl.c */
 817 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
 818                        unsigned long);
 819
 820 /* namei.c */
 821 extern int ext3_orphan_add(handle_t *, struct inode *);
 822 extern int ext3_orphan_del(handle_t *, struct inode *);
 823 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 824                                 __u32 start_minor_hash, __u32 *next_hash);
 825
 826 /* resize.c */
 827 extern int ext3_group_add(struct super_block *sb,
 828                                 struct ext3_new_group_data *input);
 829 extern int ext3_group_extend(struct super_block *sb,
 830                                 struct ext3_super_block *es,
 831                                 ext3_fsblk_t n_blocks_count);
 832
 833 /* super.c */
 834 extern void ext3_error (struct super_block *, const char *, const char *, ...)
 835         __attribute__ ((format (printf, 3, 4)));
 836 extern void __ext3_std_error (struct super_block *, const char *, int);
 837 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
 838         __attribute__ ((format (printf, 3, 4)));
 839 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
 840         __attribute__ ((format (printf, 3, 4)));
 841 extern void ext3_update_dynamic_rev (struct super_block *sb);
 842
 843 #define ext3_std_error(sb, errno)                               \
 844 do {                                                            \
 845         if ((errno))                                            \
 846                 __ext3_std_error((sb), __FUNCTION__, (errno));  \
 847 } while (0)
 848
 849 /*
 850  * Inodes and files operations
 851  */
 852
 853 /* dir.c */
 854 extern const struct file_operations ext3_dir_operations;
 855
 856 /* file.c */
 857 extern struct inode_operations ext3_file_inode_operations;
 858 extern const struct file_operations ext3_file_operations;
 859
 860 /* namei.c */
 861 extern struct inode_operations ext3_dir_inode_operations;
 862 extern struct inode_operations ext3_special_inode_operations;
 863
 864 /* symlink.c */
 865 extern struct inode_operations ext3_symlink_inode_operations;
 866 extern struct inode_operations ext3_fast_symlink_inode_operations;
 867
 868
 869 #endif  /* __KERNEL__ */
 870
 871 #endif  /* _LINUX_EXT3_FS_H */