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   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/magic.h>
  21
  22 /*
  23  * The second extended filesystem constants/structures
  24  */
  25
  26 /*
  27  * Define EXT3FS_DEBUG to produce debug messages
  28  */
  29 #undef EXT3FS_DEBUG
  30
  31 /*
  32  * Define EXT3_RESERVATION to reserve data blocks for expanding files
  33  */
  34 #define EXT3_DEFAULT_RESERVE_BLOCKS     8
  35 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  36 #define EXT3_MAX_RESERVE_BLOCKS         1027
  37 #define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
  38 /*
  39  * Always enable hashed directories
  40  */
  41 #define CONFIG_EXT3_INDEX
  42
  43 /*
  44  * Debug code
  45  */
  46 #ifdef EXT3FS_DEBUG
  47 #define ext3_debug(f, a...)                                             \
  48         do {                                                            \
  49                 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
  50                         __FILE__, __LINE__, __FUNCTION__);              \
  51                 printk (KERN_DEBUG f, ## a);                            \
  52         } while (0)
  53 #else
  54 #define ext3_debug(f, a...)     do {} while (0)
  55 #endif
  56
  57 /*
  58  * Special inodes numbers
  59  */
  60 #define EXT3_BAD_INO             1      /* Bad blocks inode */
  61 #define EXT3_ROOT_INO            2      /* Root inode */
  62 #define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
  63 #define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
  64 #define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
  65 #define EXT3_JOURNAL_INO         8      /* Journal inode */
  66
  67 /* First non-reserved inode for old ext3 filesystems */
  68 #define EXT3_GOOD_OLD_FIRST_INO 11
  69
  70 /*
  71  * Maximal count of links to a file
  72  */
  73 #define EXT3_LINK_MAX           32000
  74
  75 /*
  76  * Macro-instructions used to manage several block sizes
  77  */
  78 #define EXT3_MIN_BLOCK_SIZE             1024
  79 #define EXT3_MAX_BLOCK_SIZE             4096
  80 #define EXT3_MIN_BLOCK_LOG_SIZE           10
  81 #ifdef __KERNEL__
  82 # define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)
  83 #else
  84 # define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  85 #endif
  86 #define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
  87 #ifdef __KERNEL__
  88 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  89 #else
  90 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  91 #endif
  92 #ifdef __KERNEL__
  93 #define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
  94 #define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
  95 #define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
  96 #else
  97 #define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
  98                                  EXT3_GOOD_OLD_INODE_SIZE : \
  99                                  (s)->s_inode_size)
 100 #define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 101                                  EXT3_GOOD_OLD_FIRST_INO : \
 102                                  (s)->s_first_ino)
 103 #endif
 104
 105 /*
 106  * Macro-instructions used to manage fragments
 107  */
 108 #define EXT3_MIN_FRAG_SIZE              1024
 109 #define EXT3_MAX_FRAG_SIZE              4096
 110 #define EXT3_MIN_FRAG_LOG_SIZE            10
 111 #ifdef __KERNEL__
 112 # define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)
 113 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)
 114 #else
 115 # define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 116 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
 117 #endif
 118
 119 /*
 120  * Structure of a blocks group descriptor
 121  */
 122 struct ext3_group_desc
 123 {
 124         __le32  bg_block_bitmap;                /* Blocks bitmap block */
 125         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 126         __le32  bg_inode_table;         /* Inodes table block */
 127         __le16  bg_free_blocks_count;   /* Free blocks count */
 128         __le16  bg_free_inodes_count;   /* Free inodes count */
 129         __le16  bg_used_dirs_count;     /* Directories count */
 130         __u16   bg_pad;
 131         __le32  bg_reserved[3];
 132 };
 133
 134 /*
 135  * Macro-instructions used to manage group descriptors
 136  */
 137 #ifdef __KERNEL__
 138 # define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)
 139 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)
 140 # define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)
 141 # define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)
 142 #else
 143 # define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 144 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
 145 # define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 146 #endif
 147
 148 /*
 149  * Constants relative to the data blocks
 150  */
 151 #define EXT3_NDIR_BLOCKS                12
 152 #define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
 153 #define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
 154 #define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
 155 #define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
 156
 157 /*
 158  * Inode flags
 159  */
 160 #define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
 161 #define EXT3_UNRM_FL                    0x00000002 /* Undelete */
 162 #define EXT3_COMPR_FL                   0x00000004 /* Compress file */
 163 #define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
 164 #define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
 165 #define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
 166 #define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
 167 #define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
 168 /* Reserved for compression usage... */
 169 #define EXT3_DIRTY_FL                   0x00000100
 170 #define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 171 #define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
 172 #define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
 173 /* End compression flags --- maybe not all used */
 174 #define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
 175 #define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
 176 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 177 #define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 178 #define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 179 #define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 180 #define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
 181
 182 #define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 183 #define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 184
 185 /*
 186  * Inode dynamic state flags
 187  */
 188 #define EXT3_STATE_JDATA                0x00000001 /* journaled data exists */
 189 #define EXT3_STATE_NEW                  0x00000002 /* inode is newly created */
 190 #define EXT3_STATE_XATTR                0x00000004 /* has in-inode xattrs */
 191
 192 /* Used to pass group descriptor data when online resize is done */
 193 struct ext3_new_group_input {
 194         __u32 group;            /* Group number for this data */
 195         __u32 block_bitmap;     /* Absolute block number of block bitmap */
 196         __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
 197         __u32 inode_table;      /* Absolute block number of inode table start */
 198         __u32 blocks_count;     /* Total number of blocks in this group */
 199         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 200         __u16 unused;
 201 };
 202
 203 /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
 204 struct ext3_new_group_data {
 205         __u32 group;
 206         __u32 block_bitmap;
 207         __u32 inode_bitmap;
 208         __u32 inode_table;
 209         __u32 blocks_count;
 210         __u16 reserved_blocks;
 211         __u16 unused;
 212         __u32 free_blocks_count;
 213 };
 214
 215
 216 /*
 217  * ioctl commands
 218  */
 219 #define EXT3_IOC_GETFLAGS               FS_IOC_GETFLAGS
 220 #define EXT3_IOC_SETFLAGS               FS_IOC_SETFLAGS
 221 #define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
 222 #define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
 223 #define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 224 #define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)
 225 #define EXT3_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 226 #define EXT3_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 227 #ifdef CONFIG_JBD_DEBUG
 228 #define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 229 #endif
 230 #define EXT3_IOC_GETRSVSZ               _IOR('f', 5, long)
 231 #define EXT3_IOC_SETRSVSZ               _IOW('f', 6, long)
 232
 233 /*
 234  * ioctl commands in 32 bit emulation
 235  */
 236 #define EXT3_IOC32_GETVERSION           _IOR('f', 3, int)
 237 #define EXT3_IOC32_SETVERSION           _IOW('f', 4, int)
 238 #define EXT3_IOC32_GETRSVSZ             _IOR('f', 5, int)
 239 #define EXT3_IOC32_SETRSVSZ             _IOW('f', 6, int)
 240 #define EXT3_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 241 #ifdef CONFIG_JBD_DEBUG
 242 #define EXT3_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
 243 #endif
 244
 245 /*
 246  *  Mount options
 247  */
 248 struct ext3_mount_options {
 249         unsigned long s_mount_opt;
 250         uid_t s_resuid;
 251         gid_t s_resgid;
 252         unsigned long s_commit_interval;
 253 #ifdef CONFIG_QUOTA
 254         int s_jquota_fmt;
 255         char *s_qf_names[MAXQUOTAS];
 256 #endif
 257 };
 258
 259 /*
 260  * Structure of an inode on the disk
 261  */
 262 struct ext3_inode {
 263         __le16  i_mode;         /* File mode */
 264         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 265         __le32  i_size;         /* Size in bytes */
 266         __le32  i_atime;        /* Access time */
 267         __le32  i_ctime;        /* Creation time */
 268         __le32  i_mtime;        /* Modification time */
 269         __le32  i_dtime;        /* Deletion Time */
 270         __le16  i_gid;          /* Low 16 bits of Group Id */
 271         __le16  i_links_count;  /* Links count */
 272         __le32  i_blocks;       /* Blocks count */
 273         __le32  i_flags;        /* File flags */
 274         union {
 275                 struct {
 276                         __u32  l_i_reserved1;
 277                 } linux1;
 278                 struct {
 279                         __u32  h_i_translator;
 280                 } hurd1;
 281                 struct {
 282                         __u32  m_i_reserved1;
 283                 } masix1;
 284         } osd1;                         /* OS dependent 1 */
 285         __le32  i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
 286         __le32  i_generation;   /* File version (for NFS) */
 287         __le32  i_file_acl;     /* File ACL */
 288         __le32  i_dir_acl;      /* Directory ACL */
 289         __le32  i_faddr;        /* Fragment address */
 290         union {
 291                 struct {
 292                         __u8    l_i_frag;       /* Fragment number */
 293                         __u8    l_i_fsize;      /* Fragment size */
 294                         __u16   i_pad1;
 295                         __le16  l_i_uid_high;   /* these 2 fields    */
 296                         __le16  l_i_gid_high;   /* were reserved2[0] */
 297                         __u32   l_i_reserved2;
 298                 } linux2;
 299                 struct {
 300                         __u8    h_i_frag;       /* Fragment number */
 301                         __u8    h_i_fsize;      /* Fragment size */
 302                         __u16   h_i_mode_high;
 303                         __u16   h_i_uid_high;
 304                         __u16   h_i_gid_high;
 305                         __u32   h_i_author;
 306                 } hurd2;
 307                 struct {
 308                         __u8    m_i_frag;       /* Fragment number */
 309                         __u8    m_i_fsize;      /* Fragment size */
 310                         __u16   m_pad1;
 311                         __u32   m_i_reserved2[2];
 312                 } masix2;
 313         } osd2;                         /* OS dependent 2 */
 314         __le16  i_extra_isize;
 315         __le16  i_pad1;
 316 };
 317
 318 #define i_size_high     i_dir_acl
 319
 320 #if defined(__KERNEL__) || defined(__linux__)
 321 #define i_reserved1     osd1.linux1.l_i_reserved1
 322 #define i_frag          osd2.linux2.l_i_frag
 323 #define i_fsize         osd2.linux2.l_i_fsize
 324 #define i_uid_low       i_uid
 325 #define i_gid_low       i_gid
 326 #define i_uid_high      osd2.linux2.l_i_uid_high
 327 #define i_gid_high      osd2.linux2.l_i_gid_high
 328 #define i_reserved2     osd2.linux2.l_i_reserved2
 329
 330 #elif defined(__GNU__)
 331
 332 #define i_translator    osd1.hurd1.h_i_translator
 333 #define i_frag          osd2.hurd2.h_i_frag;
 334 #define i_fsize         osd2.hurd2.h_i_fsize;
 335 #define i_uid_high      osd2.hurd2.h_i_uid_high
 336 #define i_gid_high      osd2.hurd2.h_i_gid_high
 337 #define i_author        osd2.hurd2.h_i_author
 338
 339 #elif defined(__masix__)
 340
 341 #define i_reserved1     osd1.masix1.m_i_reserved1
 342 #define i_frag          osd2.masix2.m_i_frag
 343 #define i_fsize         osd2.masix2.m_i_fsize
 344 #define i_reserved2     osd2.masix2.m_i_reserved2
 345
 346 #endif /* defined(__KERNEL__) || defined(__linux__) */
 347
 348 /*
 349  * File system states
 350  */
 351 #define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
 352 #define EXT3_ERROR_FS                   0x0002  /* Errors detected */
 353 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 354
 355 /*
 356  * Mount flags
 357  */
 358 #define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 359 #define EXT3_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 360 #define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 361 #define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 362 #define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 363 #define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 364 #define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 365 #define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 366 #define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 367 #define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
 368 #define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 369 #define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 370 #define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 371 #define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 372 #define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 373 #define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 374 #define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 375 #define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 376 #define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
 377 #define EXT3_MOUNT_BARRIER              0x20000 /* Use block barriers */
 378 #define EXT3_MOUNT_NOBH                 0x40000 /* No bufferheads */
 379 #define EXT3_MOUNT_QUOTA                0x80000 /* Some quota option set */
 380 #define EXT3_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
 381 #define EXT3_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
 382
 383 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
 384 #ifndef _LINUX_EXT2_FS_H
 385 #define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
 386 #define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
 387 #define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
 388                                          EXT3_MOUNT_##opt)
 389 #else
 390 #define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
 391 #define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
 392 #define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
 393 #endif
 394
 395 #define ext3_set_bit                    ext2_set_bit
 396 #define ext3_set_bit_atomic             ext2_set_bit_atomic
 397 #define ext3_clear_bit                  ext2_clear_bit
 398 #define ext3_clear_bit_atomic           ext2_clear_bit_atomic
 399 #define ext3_test_bit                   ext2_test_bit
 400 #define ext3_find_first_zero_bit        ext2_find_first_zero_bit
 401 #define ext3_find_next_zero_bit         ext2_find_next_zero_bit
 402
 403 /*
 404  * Maximal mount counts between two filesystem checks
 405  */
 406 #define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 407 #define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 408
 409 /*
 410  * Behaviour when detecting errors
 411  */
 412 #define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
 413 #define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
 414 #define EXT3_ERRORS_PANIC               3       /* Panic */
 415 #define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
 416
 417 /*
 418  * Structure of the super block
 419  */
 420 struct ext3_super_block {
 421 /*00*/  __le32  s_inodes_count;         /* Inodes count */
 422         __le32  s_blocks_count;         /* Blocks count */
 423         __le32  s_r_blocks_count;       /* Reserved blocks count */
 424         __le32  s_free_blocks_count;    /* Free blocks count */
 425 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
 426         __le32  s_first_data_block;     /* First Data Block */
 427         __le32  s_log_block_size;       /* Block size */
 428         __le32  s_log_frag_size;        /* Fragment size */
 429 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
 430         __le32  s_frags_per_group;      /* # Fragments per group */
 431         __le32  s_inodes_per_group;     /* # Inodes per group */
 432         __le32  s_mtime;                /* Mount time */
 433 /*30*/  __le32  s_wtime;                /* Write time */
 434         __le16  s_mnt_count;            /* Mount count */
 435         __le16  s_max_mnt_count;        /* Maximal mount count */
 436         __le16  s_magic;                /* Magic signature */
 437         __le16  s_state;                /* File system state */
 438         __le16  s_errors;               /* Behaviour when detecting errors */
 439         __le16  s_minor_rev_level;      /* minor revision level */
 440 /*40*/  __le32  s_lastcheck;            /* time of last check */
 441         __le32  s_checkinterval;        /* max. time between checks */
 442         __le32  s_creator_os;           /* OS */
 443         __le32  s_rev_level;            /* Revision level */
 444 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
 445         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 446         /*
 447          * These fields are for EXT3_DYNAMIC_REV superblocks only.
 448          *
 449          * Note: the difference between the compatible feature set and
 450          * the incompatible feature set is that if there is a bit set
 451          * in the incompatible feature set that the kernel doesn't
 452          * know about, it should refuse to mount the filesystem.
 453          *
 454          * e2fsck's requirements are more strict; if it doesn't know
 455          * about a feature in either the compatible or incompatible
 456          * feature set, it must abort and not try to meddle with
 457          * things it doesn't understand...
 458          */
 459         __le32  s_first_ino;            /* First non-reserved inode */
 460         __le16   s_inode_size;          /* size of inode structure */
 461         __le16  s_block_group_nr;       /* block group # of this superblock */
 462         __le32  s_feature_compat;       /* compatible feature set */
 463 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
 464         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 465 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 466 /*78*/  char    s_volume_name[16];      /* volume name */
 467 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 468 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
 469         /*
 470          * Performance hints.  Directory preallocation should only
 471          * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 472          */
 473         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 474         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 475         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
 476         /*
 477          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 478          */
 479 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 480 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
 481         __le32  s_journal_dev;          /* device number of journal file */
 482         __le32  s_last_orphan;          /* start of list of inodes to delete */
 483         __le32  s_hash_seed[4];         /* HTREE hash seed */
 484         __u8    s_def_hash_version;     /* Default hash version to use */
 485         __u8    s_reserved_char_pad;
 486         __u16   s_reserved_word_pad;
 487         __le32  s_default_mount_opts;
 488         __le32  s_first_meta_bg;        /* First metablock block group */
 489         __u32   s_reserved[190];        /* Padding to the end of the block */
 490 };
 491
 492 #ifdef __KERNEL__
 493 #include <linux/ext3_fs_i.h>
 494 #include <linux/ext3_fs_sb.h>
 495 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
 496 {
 497         return sb->s_fs_info;
 498 }
 499 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
 500 {
 501         return container_of(inode, struct ext3_inode_info, vfs_inode);
 502 }
 503
 504 static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
 505 {
 506         return ino == EXT3_ROOT_INO ||
 507                 ino == EXT3_JOURNAL_INO ||
 508                 ino == EXT3_RESIZE_INO ||
 509                 (ino >= EXT3_FIRST_INO(sb) &&
 510                  ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
 511 }
 512 #else
 513 /* Assume that user mode programs are passing in an ext3fs superblock, not
 514  * a kernel struct super_block.  This will allow us to call the feature-test
 515  * macros from user land. */
 516 #define EXT3_SB(sb)     (sb)
 517 #endif
 518
 519 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
 520
 521 /*
 522  * Codes for operating systems
 523  */
 524 #define EXT3_OS_LINUX           0
 525 #define EXT3_OS_HURD            1
 526 #define EXT3_OS_MASIX           2
 527 #define EXT3_OS_FREEBSD         3
 528 #define EXT3_OS_LITES           4
 529
 530 /*
 531  * Revision levels
 532  */
 533 #define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
 534 #define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 535
 536 #define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
 537 #define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
 538
 539 #define EXT3_GOOD_OLD_INODE_SIZE 128
 540
 541 /*
 542  * Feature set definitions
 543  */
 544
 545 #define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
 546         ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 547 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 548         ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 549 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 550         ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 551 #define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
 552         EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 553 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 554         EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 555 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
 556         EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 557 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 558         EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 559 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 560         EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 561 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 562         EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 563
 564 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 565 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 566 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 567 #define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
 568 #define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
 569 #define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
 570
 571 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 572 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 573 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 574
 575 #define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
 576 #define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
 577 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 578 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 579 #define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
 580
 581 #define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 582 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
 583                                          EXT3_FEATURE_INCOMPAT_RECOVER| \
 584                                          EXT3_FEATURE_INCOMPAT_META_BG)
 585 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 586                                          EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
 587                                          EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
 588
 589 /*
 590  * Default values for user and/or group using reserved blocks
 591  */
 592 #define EXT3_DEF_RESUID         0
 593 #define EXT3_DEF_RESGID         0
 594
 595 /*
 596  * Default mount options
 597  */
 598 #define EXT3_DEFM_DEBUG         0x0001
 599 #define EXT3_DEFM_BSDGROUPS     0x0002
 600 #define EXT3_DEFM_XATTR_USER    0x0004
 601 #define EXT3_DEFM_ACL           0x0008
 602 #define EXT3_DEFM_UID16         0x0010
 603 #define EXT3_DEFM_JMODE         0x0060
 604 #define EXT3_DEFM_JMODE_DATA    0x0020
 605 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 606 #define EXT3_DEFM_JMODE_WBACK   0x0060
 607
 608 /*
 609  * Structure of a directory entry
 610  */
 611 #define EXT3_NAME_LEN 255
 612
 613 struct ext3_dir_entry {
 614         __le32  inode;                  /* Inode number */
 615         __le16  rec_len;                /* Directory entry length */
 616         __le16  name_len;               /* Name length */
 617         char    name[EXT3_NAME_LEN];    /* File name */
 618 };
 619
 620 /*
 621  * The new version of the directory entry.  Since EXT3 structures are
 622  * stored in intel byte order, and the name_len field could never be
 623  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 624  * file_type field.
 625  */
 626 struct ext3_dir_entry_2 {
 627         __le32  inode;                  /* Inode number */
 628         __le16  rec_len;                /* Directory entry length */
 629         __u8    name_len;               /* Name length */
 630         __u8    file_type;
 631         char    name[EXT3_NAME_LEN];    /* File name */
 632 };
 633
 634 /*
 635  * Ext3 directory file types.  Only the low 3 bits are used.  The
 636  * other bits are reserved for now.
 637  */
 638 #define EXT3_FT_UNKNOWN         0
 639 #define EXT3_FT_REG_FILE        1
 640 #define EXT3_FT_DIR             2
 641 #define EXT3_FT_CHRDEV          3
 642 #define EXT3_FT_BLKDEV          4
 643 #define EXT3_FT_FIFO            5
 644 #define EXT3_FT_SOCK            6
 645 #define EXT3_FT_SYMLINK         7
 646
 647 #define EXT3_FT_MAX             8
 648
 649 /*
 650  * EXT3_DIR_PAD defines the directory entries boundaries
 651  *
 652  * NOTE: It must be a multiple of 4
 653  */
 654 #define EXT3_DIR_PAD                    4
 655 #define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
 656 #define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
 657                                          ~EXT3_DIR_ROUND)
 658 /*
 659  * Hash Tree Directory indexing
 660  * (c) Daniel Phillips, 2001
 661  */
 662
 663 #ifdef CONFIG_EXT3_INDEX
 664   #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
 665                                               EXT3_FEATURE_COMPAT_DIR_INDEX) && \
 666                       (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
 667 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
 668 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 669 #else
 670   #define is_dx(dir) 0
 671 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
 672 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
 673 #endif
 674
 675 /* Legal values for the dx_root hash_version field: */
 676
 677 #define DX_HASH_LEGACY          0
 678 #define DX_HASH_HALF_MD4        1
 679 #define DX_HASH_TEA             2
 680
 681 #ifdef __KERNEL__
 682
 683 /* hash info structure used by the directory hash */
 684 struct dx_hash_info
 685 {
 686         u32             hash;
 687         u32             minor_hash;
 688         int             hash_version;
 689         u32             *seed;
 690 };
 691
 692 #define EXT3_HTREE_EOF  0x7fffffff
 693
 694 /*
 695  * Control parameters used by ext3_htree_next_block
 696  */
 697 #define HASH_NB_ALWAYS          1
 698
 699
 700 /*
 701  * Describe an inode's exact location on disk and in memory
 702  */
 703 struct ext3_iloc
 704 {
 705         struct buffer_head *bh;
 706         unsigned long offset;
 707         unsigned long block_group;
 708 };
 709
 710 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
 711 {
 712         return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
 713 }
 714
 715 /*
 716  * This structure is stuffed into the struct file's private_data field
 717  * for directories.  It is where we put information so that we can do
 718  * readdir operations in hash tree order.
 719  */
 720 struct dir_private_info {
 721         struct rb_root  root;
 722         struct rb_node  *curr_node;
 723         struct fname    *extra_fname;
 724         loff_t          last_pos;
 725         __u32           curr_hash;
 726         __u32           curr_minor_hash;
 727         __u32           next_hash;
 728 };
 729
 730 /* calculate the first block number of the group */
 731 static inline ext3_fsblk_t
 732 ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
 733 {
 734         return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
 735                 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
 736 }
 737
 738 /*
 739  * Special error return code only used by dx_probe() and its callers.
 740  */
 741 #define ERR_BAD_DX_DIR  -75000
 742
 743 /*
 744  * Function prototypes
 745  */
 746
 747 /*
 748  * Ok, these declarations are also in <linux/kernel.h> but none of the
 749  * ext3 source programs needs to include it so they are duplicated here.
 750  */
 751 # define NORET_TYPE    /**/
 752 # define ATTRIB_NORET  __attribute__((noreturn))
 753 # define NORET_AND     noreturn,
 754
 755 /* balloc.c */
 756 extern int ext3_bg_has_super(struct super_block *sb, int group);
 757 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
 758 extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
 759                         ext3_fsblk_t goal, int *errp);
 760 extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
 761                         ext3_fsblk_t goal, unsigned long *count, int *errp);
 762 extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
 763                         ext3_fsblk_t block, unsigned long count);
 764 extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
 765                                  ext3_fsblk_t block, unsigned long count,
 766                                 unsigned long *pdquot_freed_blocks);
 767 extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
 768 extern void ext3_check_blocks_bitmap (struct super_block *);
 769 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
 770                                                     unsigned int block_group,
 771                                                     struct buffer_head ** bh);
 772 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
 773 extern void ext3_init_block_alloc_info(struct inode *);
 774 extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
 775
 776 /* dir.c */
 777 extern int ext3_check_dir_entry(const char *, struct inode *,
 778                                 struct ext3_dir_entry_2 *,
 779                                 struct buffer_head *, unsigned long);
 780 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
 781                                     __u32 minor_hash,
 782                                     struct ext3_dir_entry_2 *dirent);
 783 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
 784
 785 /* fsync.c */
 786 extern int ext3_sync_file (struct file *, struct dentry *, int);
 787
 788 /* hash.c */
 789 extern int ext3fs_dirhash(const char *name, int len, struct
 790                           dx_hash_info *hinfo);
 791
 792 /* ialloc.c */
 793 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
 794 extern void ext3_free_inode (handle_t *, struct inode *);
 795 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
 796 extern unsigned long ext3_count_free_inodes (struct super_block *);
 797 extern unsigned long ext3_count_dirs (struct super_block *);
 798 extern void ext3_check_inodes_bitmap (struct super_block *);
 799 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
 800
 801
 802 /* inode.c */
 803 int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
 804                 struct buffer_head *bh, ext3_fsblk_t blocknr);
 805 struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
 806 struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
 807 int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
 808         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
 809         int create, int extend_disksize);
 810
 811 extern void ext3_read_inode (struct inode *);
 812 extern int  ext3_write_inode (struct inode *, int);
 813 extern int  ext3_setattr (struct dentry *, struct iattr *);
 814 extern void ext3_delete_inode (struct inode *);
 815 extern int  ext3_sync_inode (handle_t *, struct inode *);
 816 extern void ext3_discard_reservation (struct inode *);
 817 extern void ext3_dirty_inode(struct inode *);
 818 extern int ext3_change_inode_journal_flag(struct inode *, int);
 819 extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
 820 extern void ext3_truncate (struct inode *);
 821 extern void ext3_set_inode_flags(struct inode *);
 822 extern void ext3_set_aops(struct inode *inode);
 823
 824 /* ioctl.c */
 825 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
 826                        unsigned long);
 827
 828 /* namei.c */
 829 extern int ext3_orphan_add(handle_t *, struct inode *);
 830 extern int ext3_orphan_del(handle_t *, struct inode *);
 831 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 832                                 __u32 start_minor_hash, __u32 *next_hash);
 833
 834 /* resize.c */
 835 extern int ext3_group_add(struct super_block *sb,
 836                                 struct ext3_new_group_data *input);
 837 extern int ext3_group_extend(struct super_block *sb,
 838                                 struct ext3_super_block *es,
 839                                 ext3_fsblk_t n_blocks_count);
 840
 841 /* super.c */
 842 extern void ext3_error (struct super_block *, const char *, const char *, ...)
 843         __attribute__ ((format (printf, 3, 4)));
 844 extern void __ext3_std_error (struct super_block *, const char *, int);
 845 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
 846         __attribute__ ((format (printf, 3, 4)));
 847 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
 848         __attribute__ ((format (printf, 3, 4)));
 849 extern void ext3_update_dynamic_rev (struct super_block *sb);
 850
 851 #define ext3_std_error(sb, errno)                               \
 852 do {                                                            \
 853         if ((errno))                                            \
 854                 __ext3_std_error((sb), __FUNCTION__, (errno));  \
 855 } while (0)
 856
 857 /*
 858  * Inodes and files operations
 859  */
 860
 861 /* dir.c */
 862 extern const struct file_operations ext3_dir_operations;
 863
 864 /* file.c */
 865 extern struct inode_operations ext3_file_inode_operations;
 866 extern const struct file_operations ext3_file_operations;
 867
 868 /* namei.c */
 869 extern struct inode_operations ext3_dir_inode_operations;
 870 extern struct inode_operations ext3_special_inode_operations;
 871
 872 /* symlink.c */
 873 extern struct inode_operations ext3_symlink_inode_operations;
 874 extern struct inode_operations ext3_fast_symlink_inode_operations;
 875
 876
 877 #endif  /* __KERNEL__ */
 878
 879 #endif  /* _LINUX_EXT3_FS_H */