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_PREALLOCATE to preallocate data blocks for expanding files
  37  */
  38 #undef  EXT3_PREALLOCATE /* @@@ Fix this! */
  39 #define EXT3_DEFAULT_PREALLOC_BLOCKS    8
  40
  41 /*
  42  * Always enable hashed directories
  43  */
  44 #define CONFIG_EXT3_INDEX
  45
  46 /*
  47  * Debug code
  48  */
  49 #ifdef EXT3FS_DEBUG
  50 #define ext3_debug(f, a...)                                             \
  51         do {                                                            \
  52                 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
  53                         __FILE__, __LINE__, __FUNCTION__);              \
  54                 printk (KERN_DEBUG f, ## a);                            \
  55         } while (0)
  56 #else
  57 #define ext3_debug(f, a...)     do {} while (0)
  58 #endif
  59
  60 /*
  61  * Special inodes numbers
  62  */
  63 #define EXT3_BAD_INO             1      /* Bad blocks inode */
  64 #define EXT3_ROOT_INO            2      /* Root inode */
  65 #define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
  66 #define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
  67 #define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
  68 #define EXT3_JOURNAL_INO         8      /* Journal inode */
  69
  70 /* First non-reserved inode for old ext3 filesystems */
  71 #define EXT3_GOOD_OLD_FIRST_INO 11
  72
  73 /*
  74  * The second extended file system magic number
  75  */
  76 #define EXT3_SUPER_MAGIC        0xEF53
  77
  78 /*
  79  * Maximal count of links to a file
  80  */
  81 #define EXT3_LINK_MAX           32000
  82
  83 /*
  84  * Macro-instructions used to manage several block sizes
  85  */
  86 #define EXT3_MIN_BLOCK_SIZE             1024
  87 #define EXT3_MAX_BLOCK_SIZE             4096
  88 #define EXT3_MIN_BLOCK_LOG_SIZE           10
  89 #ifdef __KERNEL__
  90 # define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)
  91 #else
  92 # define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  93 #endif
  94 #define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
  95 #ifdef __KERNEL__
  96 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  97 #else
  98 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  99 #endif
 100 #ifdef __KERNEL__
 101 #define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
 102 #define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
 103 #define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
 104 #else
 105 #define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 106                                  EXT3_GOOD_OLD_INODE_SIZE : \
 107                                  (s)->s_inode_size)
 108 #define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 109                                  EXT3_GOOD_OLD_FIRST_INO : \
 110                                  (s)->s_first_ino)
 111 #endif
 112
 113 /*
 114  * Macro-instructions used to manage fragments
 115  */
 116 #define EXT3_MIN_FRAG_SIZE              1024
 117 #define EXT3_MAX_FRAG_SIZE              4096
 118 #define EXT3_MIN_FRAG_LOG_SIZE            10
 119 #ifdef __KERNEL__
 120 # define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)
 121 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)
 122 #else
 123 # define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 124 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
 125 #endif
 126
 127 /*
 128  * Structure of a blocks group descriptor
 129  */
 130 struct ext3_group_desc
 131 {
 132         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 133         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 134         __u32   bg_inode_table;         /* Inodes table block */
 135         __u16   bg_free_blocks_count;   /* Free blocks count */
 136         __u16   bg_free_inodes_count;   /* Free inodes count */
 137         __u16   bg_used_dirs_count;     /* Directories count */
 138         __u16   bg_pad;
 139         __u32   bg_reserved[3];
 140 };
 141
 142 /*
 143  * Macro-instructions used to manage group descriptors
 144  */
 145 #ifdef __KERNEL__
 146 # define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)
 147 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)
 148 # define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)
 149 # define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)
 150 #else
 151 # define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 152 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
 153 # define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 154 #endif
 155
 156 /*
 157  * Constants relative to the data blocks
 158  */
 159 #define EXT3_NDIR_BLOCKS                12
 160 #define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
 161 #define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
 162 #define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
 163 #define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
 164
 165 /*
 166  * Inode flags
 167  */
 168 #define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
 169 #define EXT3_UNRM_FL                    0x00000002 /* Undelete */
 170 #define EXT3_COMPR_FL                   0x00000004 /* Compress file */
 171 #define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
 172 #define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
 173 #define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
 174 #define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
 175 #define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
 176 /* Reserved for compression usage... */
 177 #define EXT3_DIRTY_FL                   0x00000100
 178 #define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 179 #define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
 180 #define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
 181 /* End compression flags --- maybe not all used */
 182 #define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
 183 #define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
 184 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 185 #define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 186 #define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 187 #define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 188 #define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
 189
 190 #define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 191 #define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 192
 193 /*
 194  * Inode dynamic state flags
 195  */
 196 #define EXT3_STATE_JDATA                0x00000001 /* journaled data exists */
 197 #define EXT3_STATE_NEW                  0x00000002 /* inode is newly created */
 198
 199 /*
 200  * ioctl commands
 201  */
 202 #define EXT3_IOC_GETFLAGS               _IOR('f', 1, long)
 203 #define EXT3_IOC_SETFLAGS               _IOW('f', 2, long)
 204 #define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
 205 #define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
 206 #define EXT3_IOC_GETVERSION_OLD         _IOR('v', 1, long)
 207 #define EXT3_IOC_SETVERSION_OLD         _IOW('v', 2, long)
 208 #ifdef CONFIG_JBD_DEBUG
 209 #define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 210 #endif
 211
 212 /*
 213  * Structure of an inode on the disk
 214  */
 215 struct ext3_inode {
 216         __u16   i_mode;         /* File mode */
 217         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 218         __u32   i_size;         /* Size in bytes */
 219         __u32   i_atime;        /* Access time */
 220         __u32   i_ctime;        /* Creation time */
 221         __u32   i_mtime;        /* Modification time */
 222         __u32   i_dtime;        /* Deletion Time */
 223         __u16   i_gid;          /* Low 16 bits of Group Id */
 224         __u16   i_links_count;  /* Links count */
 225         __u32   i_blocks;       /* Blocks count */
 226         __u32   i_flags;        /* File flags */
 227         union {
 228                 struct {
 229                         __u32  l_i_reserved1;
 230                 } linux1;
 231                 struct {
 232                         __u32  h_i_translator;
 233                 } hurd1;
 234                 struct {
 235                         __u32  m_i_reserved1;
 236                 } masix1;
 237         } osd1;                         /* OS dependent 1 */
 238         __u32   i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
 239         __u32   i_generation;   /* File version (for NFS) */
 240         __u32   i_file_acl;     /* File ACL */
 241         __u32   i_dir_acl;      /* Directory ACL */
 242         __u32   i_faddr;        /* Fragment address */
 243         union {
 244                 struct {
 245                         __u8    l_i_frag;       /* Fragment number */
 246                         __u8    l_i_fsize;      /* Fragment size */
 247                         __u16   i_pad1;
 248                         __u16   l_i_uid_high;   /* these 2 fields    */
 249                         __u16   l_i_gid_high;   /* were reserved2[0] */
 250                         __u32   l_i_reserved2;
 251                 } linux2;
 252                 struct {
 253                         __u8    h_i_frag;       /* Fragment number */
 254                         __u8    h_i_fsize;      /* Fragment size */
 255                         __u16   h_i_mode_high;
 256                         __u16   h_i_uid_high;
 257                         __u16   h_i_gid_high;
 258                         __u32   h_i_author;
 259                 } hurd2;
 260                 struct {
 261                         __u8    m_i_frag;       /* Fragment number */
 262                         __u8    m_i_fsize;      /* Fragment size */
 263                         __u16   m_pad1;
 264                         __u32   m_i_reserved2[2];
 265                 } masix2;
 266         } osd2;                         /* OS dependent 2 */
 267 };
 268
 269 #define i_size_high     i_dir_acl
 270
 271 #if defined(__KERNEL__) || defined(__linux__)
 272 #define i_reserved1     osd1.linux1.l_i_reserved1
 273 #define i_frag          osd2.linux2.l_i_frag
 274 #define i_fsize         osd2.linux2.l_i_fsize
 275 #define i_uid_low       i_uid
 276 #define i_gid_low       i_gid
 277 #define i_uid_high      osd2.linux2.l_i_uid_high
 278 #define i_gid_high      osd2.linux2.l_i_gid_high
 279 #define i_reserved2     osd2.linux2.l_i_reserved2
 280
 281 #elif defined(__GNU__)
 282
 283 #define i_translator    osd1.hurd1.h_i_translator
 284 #define i_frag          osd2.hurd2.h_i_frag;
 285 #define i_fsize         osd2.hurd2.h_i_fsize;
 286 #define i_uid_high      osd2.hurd2.h_i_uid_high
 287 #define i_gid_high      osd2.hurd2.h_i_gid_high
 288 #define i_author        osd2.hurd2.h_i_author
 289
 290 #elif defined(__masix__)
 291
 292 #define i_reserved1     osd1.masix1.m_i_reserved1
 293 #define i_frag          osd2.masix2.m_i_frag
 294 #define i_fsize         osd2.masix2.m_i_fsize
 295 #define i_reserved2     osd2.masix2.m_i_reserved2
 296
 297 #endif /* defined(__KERNEL__) || defined(__linux__) */
 298
 299 /*
 300  * File system states
 301  */
 302 #define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
 303 #define EXT3_ERROR_FS                   0x0002  /* Errors detected */
 304 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 305
 306 /*
 307  * Mount flags
 308  */
 309 #define EXT3_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 310 #define EXT3_MOUNT_OLDALLOC             0x0002  /* Don't use the new Orlov allocator */
 311 #define EXT3_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 312 #define EXT3_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 313 #define EXT3_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 314 #define EXT3_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 315 #define EXT3_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 316 #define EXT3_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 317 #define EXT3_MOUNT_NOLOAD               0x0100  /* Don't use existing journal*/
 318 #define EXT3_MOUNT_ABORT                0x0200  /* Fatal error detected */
 319 #define EXT3_MOUNT_DATA_FLAGS           0x0C00  /* Mode for data writes: */
 320   #define EXT3_MOUNT_JOURNAL_DATA       0x0400  /* Write data to journal */
 321   #define EXT3_MOUNT_ORDERED_DATA       0x0800  /* Flush data before commit */
 322   #define EXT3_MOUNT_WRITEBACK_DATA     0x0C00  /* No data ordering */
 323 #define EXT3_MOUNT_UPDATE_JOURNAL       0x1000  /* Update the journal format */
 324 #define EXT3_MOUNT_NO_UID32             0x2000  /* Disable 32-bit UIDs */
 325 #define EXT3_MOUNT_XATTR_USER           0x4000  /* Extended user attributes */
 326 #define EXT3_MOUNT_POSIX_ACL            0x8000  /* POSIX Access Control Lists */
 327
 328 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
 329 #ifndef _LINUX_EXT2_FS_H
 330 #define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
 331 #define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
 332 #define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
 333                                          EXT3_MOUNT_##opt)
 334 #else
 335 #define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
 336 #define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
 337 #define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
 338 #endif
 339
 340 #define ext3_set_bit                    ext2_set_bit
 341 #define ext3_set_bit_atomic             ext2_set_bit_atomic
 342 #define ext3_clear_bit                  ext2_clear_bit
 343 #define ext3_clear_bit_atomic           ext2_clear_bit_atomic
 344 #define ext3_test_bit                   ext2_test_bit
 345 #define ext3_find_first_zero_bit        ext2_find_first_zero_bit
 346 #define ext3_find_next_zero_bit         ext2_find_next_zero_bit
 347
 348 /*
 349  * Maximal mount counts between two filesystem checks
 350  */
 351 #define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 352 #define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 353
 354 /*
 355  * Behaviour when detecting errors
 356  */
 357 #define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
 358 #define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
 359 #define EXT3_ERRORS_PANIC               3       /* Panic */
 360 #define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
 361
 362 /*
 363  * Structure of the super block
 364  */
 365 struct ext3_super_block {
 366 /*00*/  __u32   s_inodes_count;         /* Inodes count */
 367         __u32   s_blocks_count;         /* Blocks count */
 368         __u32   s_r_blocks_count;       /* Reserved blocks count */
 369         __u32   s_free_blocks_count;    /* Free blocks count */
 370 /*10*/  __u32   s_free_inodes_count;    /* Free inodes count */
 371         __u32   s_first_data_block;     /* First Data Block */
 372         __u32   s_log_block_size;       /* Block size */
 373         __s32   s_log_frag_size;        /* Fragment size */
 374 /*20*/  __u32   s_blocks_per_group;     /* # Blocks per group */
 375         __u32   s_frags_per_group;      /* # Fragments per group */
 376         __u32   s_inodes_per_group;     /* # Inodes per group */
 377         __u32   s_mtime;                /* Mount time */
 378 /*30*/  __u32   s_wtime;                /* Write time */
 379         __u16   s_mnt_count;            /* Mount count */
 380         __s16   s_max_mnt_count;        /* Maximal mount count */
 381         __u16   s_magic;                /* Magic signature */
 382         __u16   s_state;                /* File system state */
 383         __u16   s_errors;               /* Behaviour when detecting errors */
 384         __u16   s_minor_rev_level;      /* minor revision level */
 385 /*40*/  __u32   s_lastcheck;            /* time of last check */
 386         __u32   s_checkinterval;        /* max. time between checks */
 387         __u32   s_creator_os;           /* OS */
 388         __u32   s_rev_level;            /* Revision level */
 389 /*50*/  __u16   s_def_resuid;           /* Default uid for reserved blocks */
 390         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 391         /*
 392          * These fields are for EXT3_DYNAMIC_REV superblocks only.
 393          *
 394          * Note: the difference between the compatible feature set and
 395          * the incompatible feature set is that if there is a bit set
 396          * in the incompatible feature set that the kernel doesn't
 397          * know about, it should refuse to mount the filesystem.
 398          *
 399          * e2fsck's requirements are more strict; if it doesn't know
 400          * about a feature in either the compatible or incompatible
 401          * feature set, it must abort and not try to meddle with
 402          * things it doesn't understand...
 403          */
 404         __u32   s_first_ino;            /* First non-reserved inode */
 405         __u16   s_inode_size;           /* size of inode structure */
 406         __u16   s_block_group_nr;       /* block group # of this superblock */
 407         __u32   s_feature_compat;       /* compatible feature set */
 408 /*60*/  __u32   s_feature_incompat;     /* incompatible feature set */
 409         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 410 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 411 /*78*/  char    s_volume_name[16];      /* volume name */
 412 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 413 /*C8*/  __u32   s_algorithm_usage_bitmap; /* For compression */
 414         /*
 415          * Performance hints.  Directory preallocation should only
 416          * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 417          */
 418         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 419         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 420         __u16   s_padding1;
 421         /*
 422          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 423          */
 424 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 425 /*E0*/  __u32   s_journal_inum;         /* inode number of journal file */
 426         __u32   s_journal_dev;          /* device number of journal file */
 427         __u32   s_last_orphan;          /* start of list of inodes to delete */
 428         __u32   s_hash_seed[4];         /* HTREE hash seed */
 429         __u8    s_def_hash_version;     /* Default hash version to use */
 430         __u8    s_reserved_char_pad;
 431         __u16   s_reserved_word_pad;
 432         __u32   s_default_mount_opts;
 433         __u32   s_first_meta_bg;        /* First metablock block group */
 434         __u32   s_reserved[190];        /* Padding to the end of the block */
 435 };
 436
 437 #ifdef __KERNEL__
 438 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
 439 {
 440         return sb->s_fs_info;
 441 }
 442 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
 443 {
 444         return container_of(inode, struct ext3_inode_info, vfs_inode);
 445 }
 446 #else
 447 /* Assume that user mode programs are passing in an ext3fs superblock, not
 448  * a kernel struct super_block.  This will allow us to call the feature-test
 449  * macros from user land. */
 450 #define EXT3_SB(sb)     (sb)
 451 #endif
 452
 453 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
 454
 455 /*
 456  * Codes for operating systems
 457  */
 458 #define EXT3_OS_LINUX           0
 459 #define EXT3_OS_HURD            1
 460 #define EXT3_OS_MASIX           2
 461 #define EXT3_OS_FREEBSD         3
 462 #define EXT3_OS_LITES           4
 463
 464 /*
 465  * Revision levels
 466  */
 467 #define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
 468 #define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 469
 470 #define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
 471 #define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
 472
 473 #define EXT3_GOOD_OLD_INODE_SIZE 128
 474
 475 /*
 476  * Feature set definitions
 477  */
 478
 479 #define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
 480         ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 481 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 482         ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 483 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 484         ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 485 #define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
 486         EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 487 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 488         EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 489 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
 490         EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 491 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 492         EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 493 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 494         EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 495 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 496         EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 497
 498 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 499 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 500 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 501 #define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
 502 #define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
 503 #define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
 504
 505 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 506 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 507 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 508
 509 #define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
 510 #define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
 511 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 512 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 513 #define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
 514
 515 #define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 516 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
 517                                          EXT3_FEATURE_INCOMPAT_RECOVER| \
 518                                          EXT3_FEATURE_INCOMPAT_META_BG)
 519 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 520                                          EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
 521                                          EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
 522
 523 /*
 524  * Default values for user and/or group using reserved blocks
 525  */
 526 #define EXT3_DEF_RESUID         0
 527 #define EXT3_DEF_RESGID         0
 528
 529 /*
 530  * Default mount options
 531  */
 532 #define EXT3_DEFM_DEBUG         0x0001
 533 #define EXT3_DEFM_BSDGROUPS     0x0002
 534 #define EXT3_DEFM_XATTR_USER    0x0004
 535 #define EXT3_DEFM_ACL           0x0008
 536 #define EXT3_DEFM_UID16         0x0010
 537 #define EXT3_DEFM_JMODE         0x0060
 538 #define EXT3_DEFM_JMODE_DATA    0x0020
 539 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 540 #define EXT3_DEFM_JMODE_WBACK   0x0060
 541
 542 /*
 543  * Structure of a directory entry
 544  */
 545 #define EXT3_NAME_LEN 255
 546
 547 struct ext3_dir_entry {
 548         __u32   inode;                  /* Inode number */
 549         __u16   rec_len;                /* Directory entry length */
 550         __u16   name_len;               /* Name length */
 551         char    name[EXT3_NAME_LEN];    /* File name */
 552 };
 553
 554 /*
 555  * The new version of the directory entry.  Since EXT3 structures are
 556  * stored in intel byte order, and the name_len field could never be
 557  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 558  * file_type field.
 559  */
 560 struct ext3_dir_entry_2 {
 561         __u32   inode;                  /* Inode number */
 562         __u16   rec_len;                /* Directory entry length */
 563         __u8    name_len;               /* Name length */
 564         __u8    file_type;
 565         char    name[EXT3_NAME_LEN];    /* File name */
 566 };
 567
 568 /*
 569  * Ext3 directory file types.  Only the low 3 bits are used.  The
 570  * other bits are reserved for now.
 571  */
 572 #define EXT3_FT_UNKNOWN         0
 573 #define EXT3_FT_REG_FILE        1
 574 #define EXT3_FT_DIR             2
 575 #define EXT3_FT_CHRDEV          3
 576 #define EXT3_FT_BLKDEV          4
 577 #define EXT3_FT_FIFO            5
 578 #define EXT3_FT_SOCK            6
 579 #define EXT3_FT_SYMLINK         7
 580
 581 #define EXT3_FT_MAX             8
 582
 583 /*
 584  * EXT3_DIR_PAD defines the directory entries boundaries
 585  *
 586  * NOTE: It must be a multiple of 4
 587  */
 588 #define EXT3_DIR_PAD                    4
 589 #define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
 590 #define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
 591                                          ~EXT3_DIR_ROUND)
 592 /*
 593  * Hash Tree Directory indexing
 594  * (c) Daniel Phillips, 2001
 595  */
 596
 597 #ifdef CONFIG_EXT3_INDEX
 598   #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
 599                                               EXT3_FEATURE_COMPAT_DIR_INDEX) && \
 600                       (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
 601 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
 602 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 603 #else
 604   #define is_dx(dir) 0
 605 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
 606 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
 607 #endif
 608
 609 /* Legal values for the dx_root hash_version field: */
 610
 611 #define DX_HASH_LEGACY          0
 612 #define DX_HASH_HALF_MD4        1
 613 #define DX_HASH_TEA             2
 614
 615 /* hash info structure used by the directory hash */
 616 struct dx_hash_info
 617 {
 618         u32             hash;
 619         u32             minor_hash;
 620         int             hash_version;
 621         u32             *seed;
 622 };
 623
 624 #define EXT3_HTREE_EOF  0x7fffffff
 625
 626 #ifdef __KERNEL__
 627 /*
 628  * Control parameters used by ext3_htree_next_block
 629  */
 630 #define HASH_NB_ALWAYS          1
 631
 632
 633 /*
 634  * Describe an inode's exact location on disk and in memory
 635  */
 636 struct ext3_iloc
 637 {
 638         struct buffer_head *bh;
 639         unsigned long offset;
 640         unsigned long block_group;
 641 };
 642
 643 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
 644 {
 645         return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
 646 }
 647
 648 /*
 649  * This structure is stuffed into the struct file's private_data field
 650  * for directories.  It is where we put information so that we can do
 651  * readdir operations in hash tree order.
 652  */
 653 struct dir_private_info {
 654         struct rb_root  root;
 655         struct rb_node  *curr_node;
 656         struct fname    *extra_fname;
 657         loff_t          last_pos;
 658         __u32           curr_hash;
 659         __u32           curr_minor_hash;
 660         __u32           next_hash;
 661 };
 662
 663 /*
 664  * Special error return code only used by dx_probe() and its callers.
 665  */
 666 #define ERR_BAD_DX_DIR  -75000
 667
 668 /*
 669  * Function prototypes
 670  */
 671
 672 /*
 673  * Ok, these declarations are also in <linux/kernel.h> but none of the
 674  * ext3 source programs needs to include it so they are duplicated here.
 675  */
 676 # define NORET_TYPE    /**/
 677 # define ATTRIB_NORET  __attribute__((noreturn))
 678 # define NORET_AND     noreturn,
 679
 680 /* balloc.c */
 681 extern int ext3_bg_has_super(struct super_block *sb, int group);
 682 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
 683 extern int ext3_new_block (handle_t *, struct inode *, unsigned long,
 684                                             __u32 *, __u32 *, int *);
 685 extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
 686                               unsigned long);
 687 extern unsigned long ext3_count_free_blocks (struct super_block *);
 688 extern void ext3_check_blocks_bitmap (struct super_block *);
 689 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
 690                                                     unsigned int block_group,
 691                                                     struct buffer_head ** bh);
 692
 693 /* dir.c */
 694 extern int ext3_check_dir_entry(const char *, struct inode *,
 695                                 struct ext3_dir_entry_2 *,
 696                                 struct buffer_head *, unsigned long);
 697 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
 698                                     __u32 minor_hash,
 699                                     struct ext3_dir_entry_2 *dirent);
 700 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
 701
 702 /* fsync.c */
 703 extern int ext3_sync_file (struct file *, struct dentry *, int);
 704
 705 /* hash.c */
 706 extern int ext3fs_dirhash(const char *name, int len, struct
 707                           dx_hash_info *hinfo);
 708
 709 /* ialloc.c */
 710 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
 711 extern void ext3_free_inode (handle_t *, struct inode *);
 712 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
 713 extern unsigned long ext3_count_free_inodes (struct super_block *);
 714 extern unsigned long ext3_count_dirs (struct super_block *);
 715 extern void ext3_check_inodes_bitmap (struct super_block *);
 716 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
 717
 718
 719 /* inode.c */
 720 extern int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
 721 extern struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
 722 extern struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
 723
 724 extern void ext3_read_inode (struct inode *);
 725 extern void ext3_write_inode (struct inode *, int);
 726 extern int  ext3_setattr (struct dentry *, struct iattr *);
 727 extern void ext3_put_inode (struct inode *);
 728 extern void ext3_delete_inode (struct inode *);
 729 extern int  ext3_sync_inode (handle_t *, struct inode *);
 730 extern void ext3_discard_prealloc (struct inode *);
 731 extern void ext3_dirty_inode(struct inode *);
 732 extern int ext3_change_inode_journal_flag(struct inode *, int);
 733 extern void ext3_truncate (struct inode *);
 734 extern void ext3_set_inode_flags(struct inode *);
 735 extern void ext3_set_aops(struct inode *inode);
 736
 737 /* ioctl.c */
 738 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
 739                        unsigned long);
 740
 741 /* namei.c */
 742 extern int ext3_orphan_add(handle_t *, struct inode *);
 743 extern int ext3_orphan_del(handle_t *, struct inode *);
 744 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 745                                 __u32 start_minor_hash, __u32 *next_hash);
 746
 747 /* super.c */
 748 extern void ext3_error (struct super_block *, const char *, const char *, ...)
 749         __attribute__ ((format (printf, 3, 4)));
 750 extern void __ext3_std_error (struct super_block *, const char *, int);
 751 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
 752         __attribute__ ((format (printf, 3, 4)));
 753 extern NORET_TYPE void ext3_panic (struct super_block *, const char *,
 754                                    const char *, ...)
 755         __attribute__ ((NORET_AND format (printf, 3, 4)));
 756 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
 757         __attribute__ ((format (printf, 3, 4)));
 758 extern void ext3_update_dynamic_rev (struct super_block *sb);
 759 extern void ext3_put_super (struct super_block *);
 760 extern void ext3_write_super (struct super_block *);
 761 extern void ext3_write_super_lockfs (struct super_block *);
 762 extern void ext3_unlockfs (struct super_block *);
 763 extern int ext3_remount (struct super_block *, int *, char *);
 764 extern int ext3_statfs (struct super_block *, struct kstatfs *);
 765
 766 #define ext3_std_error(sb, errno)                               \
 767 do {                                                            \
 768         if ((errno))                                            \
 769                 __ext3_std_error((sb), __FUNCTION__, (errno));  \
 770 } while (0)
 771 extern const char *ext3_decode_error(struct super_block *sb, int errno, char nbuf[16]);
 772
 773 /*
 774  * Inodes and files operations
 775  */
 776
 777 /* dir.c */
 778 extern struct file_operations ext3_dir_operations;
 779
 780 /* file.c */
 781 extern struct inode_operations ext3_file_inode_operations;
 782 extern struct file_operations ext3_file_operations;
 783
 784 /* namei.c */
 785 extern struct inode_operations ext3_dir_inode_operations;
 786 extern struct inode_operations ext3_special_inode_operations;
 787
 788 /* symlink.c */
 789 extern struct inode_operations ext3_symlink_inode_operations;
 790 extern struct inode_operations ext3_fast_symlink_inode_operations;
 791
 792
 793 #endif  /* __KERNEL__ */
 794
 795 #endif  /* _LINUX_EXT3_FS_H */