include/linux/ext3_fs.h

   1 /*
   2  *  linux/include/linux/ext3_fs.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _LINUX_EXT3_FS_H
  17 #define _LINUX_EXT3_FS_H
  18
  19 #include <linux/types.h>
  20 #include <linux/ext3_fs_i.h>
  21 #include <linux/ext3_fs_sb.h>
  22
  23
  24 struct statfs;
  25
  26 /*
  27  * The second extended filesystem constants/structures
  28  */
  29
  30 /*
  31  * Define EXT3FS_DEBUG to produce debug messages
  32  */
  33 #undef EXT3FS_DEBUG
  34
  35 /*
  36  * Define EXT3_RESERVATION to reserve data blocks for expanding files
  37  */
  38 #define EXT3_DEFAULT_RESERVE_BLOCKS     8
  39 #define EXT3_MAX_RESERVE_BLOCKS         1024
  40 /*
  41  * Always enable hashed directories
  42  */
  43 #define CONFIG_EXT3_INDEX
  44
  45 /*
  46  * Debug code
  47  */
  48 #ifdef EXT3FS_DEBUG
  49 #define ext3_debug(f, a...)                                             \
  50         do {                                                            \
  51                 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
  52                         __FILE__, __LINE__, __FUNCTION__);              \
  53                 printk (KERN_DEBUG f, ## a);                            \
  54         } while (0)
  55 #else
  56 #define ext3_debug(f, a...)     do {} while (0)
  57 #endif
  58
  59 /*
  60  * Special inodes numbers
  61  */
  62 #define EXT3_BAD_INO             1      /* Bad blocks inode */
  63 #define EXT3_ROOT_INO            2      /* Root inode */
  64 #define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
  65 #define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
  66 #define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
  67 #define EXT3_JOURNAL_INO         8      /* Journal inode */
  68
  69 /* First non-reserved inode for old ext3 filesystems */
  70 #define EXT3_GOOD_OLD_FIRST_INO 11
  71
  72 /*
  73  * The second extended file system magic number
  74  */
  75 #define EXT3_SUPER_MAGIC        0xEF53
  76
  77 /*
  78  * Maximal count of links to a file
  79  */
  80 #define EXT3_LINK_MAX           32000
  81
  82 /*
  83  * Macro-instructions used to manage several block sizes
  84  */
  85 #define EXT3_MIN_BLOCK_SIZE             1024
  86 #define EXT3_MAX_BLOCK_SIZE             4096
  87 #define EXT3_MIN_BLOCK_LOG_SIZE           10
  88 #ifdef __KERNEL__
  89 # define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)
  90 #else
  91 # define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  92 #endif
  93 #define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
  94 #ifdef __KERNEL__
  95 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  96 #else
  97 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  98 #endif
  99 #ifdef __KERNEL__
 100 #define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
 101 #define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
 102 #define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
 103 #else
 104 #define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 105                                  EXT3_GOOD_OLD_INODE_SIZE : \
 106                                  (s)->s_inode_size)
 107 #define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
 108                                  EXT3_GOOD_OLD_FIRST_INO : \
 109                                  (s)->s_first_ino)
 110 #endif
 111
 112 /*
 113  * Macro-instructions used to manage fragments
 114  */
 115 #define EXT3_MIN_FRAG_SIZE              1024
 116 #define EXT3_MAX_FRAG_SIZE              4096
 117 #define EXT3_MIN_FRAG_LOG_SIZE            10
 118 #ifdef __KERNEL__
 119 # define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)
 120 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)
 121 #else
 122 # define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 123 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
 124 #endif
 125
 126 /*
 127  * Structure of a blocks group descriptor
 128  */
 129 struct ext3_group_desc
 130 {
 131         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 132         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 133         __u32   bg_inode_table;         /* Inodes table block */
 134         __u16   bg_free_blocks_count;   /* Free blocks count */
 135         __u16   bg_free_inodes_count;   /* Free inodes count */
 136         __u16   bg_used_dirs_count;     /* Directories count */
 137         __u16   bg_pad;
 138         __u32   bg_reserved[3];
 139 };
 140
 141 /*
 142  * Macro-instructions used to manage group descriptors
 143  */
 144 #ifdef __KERNEL__
 145 # define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)
 146 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)
 147 # define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)
 148 # define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)
 149 #else
 150 # define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 151 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
 152 # define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 153 #endif
 154
 155 /*
 156  * Constants relative to the data blocks
 157  */
 158 #define EXT3_NDIR_BLOCKS                12
 159 #define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
 160 #define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
 161 #define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
 162 #define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
 163
 164 /*
 165  * Inode flags
 166  */
 167 #define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
 168 #define EXT3_UNRM_FL                    0x00000002 /* Undelete */
 169 #define EXT3_COMPR_FL                   0x00000004 /* Compress file */
 170 #define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
 171 #define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
 172 #define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
 173 #define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
 174 #define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
 175 /* Reserved for compression usage... */
 176 #define EXT3_DIRTY_FL                   0x00000100
 177 #define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 178 #define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
 179 #define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
 180 /* End compression flags --- maybe not all used */
 181 #define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
 182 #define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
 183 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 184 #define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 185 #define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 186 #define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 187 #define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
 188
 189 #define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 190 #define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 191
 192 /*
 193  * Inode dynamic state flags
 194  */
 195 #define EXT3_STATE_JDATA                0x00000001 /* journaled data exists */
 196 #define EXT3_STATE_NEW                  0x00000002 /* inode is newly created */
 197 #define EXT3_STATE_RESIZE               0x00000004 /* fake inode for resizing */
 198
 199
 200 /* Used to pass group descriptor data when online resize is done */
 201 struct ext3_new_group_input {
 202         __u32 group;            /* Group number for this data */
 203         __u32 block_bitmap;     /* Absolute block number of block bitmap */
 204         __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
 205         __u32 inode_table;      /* Absolute block number of inode table start */
 206         __u32 blocks_count;     /* Total number of blocks in this group */
 207         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 208         __u16 unused;
 209 };
 210
 211 /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
 212 struct ext3_new_group_data {
 213         __u32 group;
 214         __u32 block_bitmap;
 215         __u32 inode_bitmap;
 216         __u32 inode_table;
 217         __u32 blocks_count;
 218         __u16 reserved_blocks;
 219         __u16 unused;
 220         __u32 free_blocks_count;
 221 };
 222
 223
 224 /*
 225  * ioctl commands
 226  */
 227 #define EXT3_IOC_GETFLAGS               _IOR('f', 1, long)
 228 #define EXT3_IOC_SETFLAGS               _IOW('f', 2, long)
 229 #define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
 230 #define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
 231 #define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 232 #define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)
 233 #define EXT3_IOC_GETVERSION_OLD         _IOR('v', 1, long)
 234 #define EXT3_IOC_SETVERSION_OLD         _IOW('v', 2, long)
 235 #ifdef CONFIG_JBD_DEBUG
 236 #define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
 237 #endif
 238 #define EXT3_IOC_GETRSVSZ               _IOR('r', 1, long)
 239 #define EXT3_IOC_SETRSVSZ               _IOW('r', 2, long)
 240
 241 /*
 242  * Structure of an inode on the disk
 243  */
 244 struct ext3_inode {
 245         __u16   i_mode;         /* File mode */
 246         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 247         __u32   i_size;         /* Size in bytes */
 248         __u32   i_atime;        /* Access time */
 249         __u32   i_ctime;        /* Creation time */
 250         __u32   i_mtime;        /* Modification time */
 251         __u32   i_dtime;        /* Deletion Time */
 252         __u16   i_gid;          /* Low 16 bits of Group Id */
 253         __u16   i_links_count;  /* Links count */
 254         __u32   i_blocks;       /* Blocks count */
 255         __u32   i_flags;        /* File flags */
 256         union {
 257                 struct {
 258                         __u32  l_i_reserved1;
 259                 } linux1;
 260                 struct {
 261                         __u32  h_i_translator;
 262                 } hurd1;
 263                 struct {
 264                         __u32  m_i_reserved1;
 265                 } masix1;
 266         } osd1;                         /* OS dependent 1 */
 267         __u32   i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
 268         __u32   i_generation;   /* File version (for NFS) */
 269         __u32   i_file_acl;     /* File ACL */
 270         __u32   i_dir_acl;      /* Directory ACL */
 271         __u32   i_faddr;        /* Fragment address */
 272         union {
 273                 struct {
 274                         __u8    l_i_frag;       /* Fragment number */
 275                         __u8    l_i_fsize;      /* Fragment size */
 276                         __u16   i_pad1;
 277                         __u16   l_i_uid_high;   /* these 2 fields    */
 278                         __u16   l_i_gid_high;   /* were reserved2[0] */
 279                         __u32   l_i_reserved2;
 280                 } linux2;
 281                 struct {
 282                         __u8    h_i_frag;       /* Fragment number */
 283                         __u8    h_i_fsize;      /* Fragment size */
 284                         __u16   h_i_mode_high;
 285                         __u16   h_i_uid_high;
 286                         __u16   h_i_gid_high;
 287                         __u32   h_i_author;
 288                 } hurd2;
 289                 struct {
 290                         __u8    m_i_frag;       /* Fragment number */
 291                         __u8    m_i_fsize;      /* Fragment size */
 292                         __u16   m_pad1;
 293                         __u32   m_i_reserved2[2];
 294                 } masix2;
 295         } osd2;                         /* OS dependent 2 */
 296 };
 297
 298 #define i_size_high     i_dir_acl
 299
 300 #if defined(__KERNEL__) || defined(__linux__)
 301 #define i_reserved1     osd1.linux1.l_i_reserved1
 302 #define i_frag          osd2.linux2.l_i_frag
 303 #define i_fsize         osd2.linux2.l_i_fsize
 304 #define i_uid_low       i_uid
 305 #define i_gid_low       i_gid
 306 #define i_uid_high      osd2.linux2.l_i_uid_high
 307 #define i_gid_high      osd2.linux2.l_i_gid_high
 308 #define i_reserved2     osd2.linux2.l_i_reserved2
 309
 310 #elif defined(__GNU__)
 311
 312 #define i_translator    osd1.hurd1.h_i_translator
 313 #define i_frag          osd2.hurd2.h_i_frag;
 314 #define i_fsize         osd2.hurd2.h_i_fsize;
 315 #define i_uid_high      osd2.hurd2.h_i_uid_high
 316 #define i_gid_high      osd2.hurd2.h_i_gid_high
 317 #define i_author        osd2.hurd2.h_i_author
 318
 319 #elif defined(__masix__)
 320
 321 #define i_reserved1     osd1.masix1.m_i_reserved1
 322 #define i_frag          osd2.masix2.m_i_frag
 323 #define i_fsize         osd2.masix2.m_i_fsize
 324 #define i_reserved2     osd2.masix2.m_i_reserved2
 325
 326 #endif /* defined(__KERNEL__) || defined(__linux__) */
 327
 328 /*
 329  * File system states
 330  */
 331 #define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
 332 #define EXT3_ERROR_FS                   0x0002  /* Errors detected */
 333 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 334
 335 /*
 336  * Mount flags
 337  */
 338 #define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
 339 #define EXT3_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
 340 #define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 341 #define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
 342 #define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
 343 #define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
 344 #define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
 345 #define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
 346 #define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
 347 #define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
 348 #define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
 349 #define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
 350 #define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
 351 #define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
 352 #define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
 353 #define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
 354 #define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
 355 #define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
 356 #define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
 357
 358 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
 359 #ifndef _LINUX_EXT2_FS_H
 360 #define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
 361 #define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
 362 #define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
 363                                          EXT3_MOUNT_##opt)
 364 #else
 365 #define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
 366 #define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
 367 #define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
 368 #endif
 369
 370 #define ext3_set_bit                    ext2_set_bit
 371 #define ext3_set_bit_atomic             ext2_set_bit_atomic
 372 #define ext3_clear_bit                  ext2_clear_bit
 373 #define ext3_clear_bit_atomic           ext2_clear_bit_atomic
 374 #define ext3_test_bit                   ext2_test_bit
 375 #define ext3_find_first_zero_bit        ext2_find_first_zero_bit
 376 #define ext3_find_next_zero_bit         ext2_find_next_zero_bit
 377
 378 /*
 379  * Maximal mount counts between two filesystem checks
 380  */
 381 #define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 382 #define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 383
 384 /*
 385  * Behaviour when detecting errors
 386  */
 387 #define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
 388 #define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
 389 #define EXT3_ERRORS_PANIC               3       /* Panic */
 390 #define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
 391
 392 /*
 393  * Structure of the super block
 394  */
 395 struct ext3_super_block {
 396 /*00*/  __u32   s_inodes_count;         /* Inodes count */
 397         __u32   s_blocks_count;         /* Blocks count */
 398         __u32   s_r_blocks_count;       /* Reserved blocks count */
 399         __u32   s_free_blocks_count;    /* Free blocks count */
 400 /*10*/  __u32   s_free_inodes_count;    /* Free inodes count */
 401         __u32   s_first_data_block;     /* First Data Block */
 402         __u32   s_log_block_size;       /* Block size */
 403         __s32   s_log_frag_size;        /* Fragment size */
 404 /*20*/  __u32   s_blocks_per_group;     /* # Blocks per group */
 405         __u32   s_frags_per_group;      /* # Fragments per group */
 406         __u32   s_inodes_per_group;     /* # Inodes per group */
 407         __u32   s_mtime;                /* Mount time */
 408 /*30*/  __u32   s_wtime;                /* Write time */
 409         __u16   s_mnt_count;            /* Mount count */
 410         __s16   s_max_mnt_count;        /* Maximal mount count */
 411         __u16   s_magic;                /* Magic signature */
 412         __u16   s_state;                /* File system state */
 413         __u16   s_errors;               /* Behaviour when detecting errors */
 414         __u16   s_minor_rev_level;      /* minor revision level */
 415 /*40*/  __u32   s_lastcheck;            /* time of last check */
 416         __u32   s_checkinterval;        /* max. time between checks */
 417         __u32   s_creator_os;           /* OS */
 418         __u32   s_rev_level;            /* Revision level */
 419 /*50*/  __u16   s_def_resuid;           /* Default uid for reserved blocks */
 420         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 421         /*
 422          * These fields are for EXT3_DYNAMIC_REV superblocks only.
 423          *
 424          * Note: the difference between the compatible feature set and
 425          * the incompatible feature set is that if there is a bit set
 426          * in the incompatible feature set that the kernel doesn't
 427          * know about, it should refuse to mount the filesystem.
 428          *
 429          * e2fsck's requirements are more strict; if it doesn't know
 430          * about a feature in either the compatible or incompatible
 431          * feature set, it must abort and not try to meddle with
 432          * things it doesn't understand...
 433          */
 434         __u32   s_first_ino;            /* First non-reserved inode */
 435         __u16   s_inode_size;           /* size of inode structure */
 436         __u16   s_block_group_nr;       /* block group # of this superblock */
 437         __u32   s_feature_compat;       /* compatible feature set */
 438 /*60*/  __u32   s_feature_incompat;     /* incompatible feature set */
 439         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 440 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
 441 /*78*/  char    s_volume_name[16];      /* volume name */
 442 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
 443 /*C8*/  __u32   s_algorithm_usage_bitmap; /* For compression */
 444         /*
 445          * Performance hints.  Directory preallocation should only
 446          * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 447          */
 448         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 449         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 450         __u16   s_reserved_gdt_blocks;  /* Per group desc for online growth */
 451         /*
 452          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 453          */
 454 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 455 /*E0*/  __u32   s_journal_inum;         /* inode number of journal file */
 456         __u32   s_journal_dev;          /* device number of journal file */
 457         __u32   s_last_orphan;          /* start of list of inodes to delete */
 458         __u32   s_hash_seed[4];         /* HTREE hash seed */
 459         __u8    s_def_hash_version;     /* Default hash version to use */
 460         __u8    s_reserved_char_pad;
 461         __u16   s_reserved_word_pad;
 462         __u32   s_default_mount_opts;
 463         __u32   s_first_meta_bg;        /* First metablock block group */
 464         __u32   s_reserved[190];        /* Padding to the end of the block */
 465 };
 466
 467 #ifdef __KERNEL__
 468 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
 469 {
 470         return sb->s_fs_info;
 471 }
 472 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
 473 {
 474         return container_of(inode, struct ext3_inode_info, vfs_inode);
 475 }
 476 #else
 477 /* Assume that user mode programs are passing in an ext3fs superblock, not
 478  * a kernel struct super_block.  This will allow us to call the feature-test
 479  * macros from user land. */
 480 #define EXT3_SB(sb)     (sb)
 481 #endif
 482
 483 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
 484
 485 /*
 486  * Codes for operating systems
 487  */
 488 #define EXT3_OS_LINUX           0
 489 #define EXT3_OS_HURD            1
 490 #define EXT3_OS_MASIX           2
 491 #define EXT3_OS_FREEBSD         3
 492 #define EXT3_OS_LITES           4
 493
 494 /*
 495  * Revision levels
 496  */
 497 #define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
 498 #define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 499
 500 #define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
 501 #define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
 502
 503 #define EXT3_GOOD_OLD_INODE_SIZE 128
 504
 505 /*
 506  * Feature set definitions
 507  */
 508
 509 #define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
 510         ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 511 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 512         ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 513 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 514         ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 515 #define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
 516         EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 517 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 518         EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 519 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
 520         EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 521 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 522         EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 523 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 524         EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 525 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 526         EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 527
 528 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 529 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 530 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 531 #define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
 532 #define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
 533 #define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
 534
 535 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 536 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 537 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 538
 539 #define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
 540 #define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
 541 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 542 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 543 #define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
 544
 545 #define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 546 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
 547                                          EXT3_FEATURE_INCOMPAT_RECOVER| \
 548                                          EXT3_FEATURE_INCOMPAT_META_BG)
 549 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 550                                          EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
 551                                          EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
 552
 553 /*
 554  * Default values for user and/or group using reserved blocks
 555  */
 556 #define EXT3_DEF_RESUID         0
 557 #define EXT3_DEF_RESGID         0
 558
 559 /*
 560  * Default mount options
 561  */
 562 #define EXT3_DEFM_DEBUG         0x0001
 563 #define EXT3_DEFM_BSDGROUPS     0x0002
 564 #define EXT3_DEFM_XATTR_USER    0x0004
 565 #define EXT3_DEFM_ACL           0x0008
 566 #define EXT3_DEFM_UID16         0x0010
 567 #define EXT3_DEFM_JMODE         0x0060
 568 #define EXT3_DEFM_JMODE_DATA    0x0020
 569 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 570 #define EXT3_DEFM_JMODE_WBACK   0x0060
 571
 572 /*
 573  * Structure of a directory entry
 574  */
 575 #define EXT3_NAME_LEN 255
 576
 577 struct ext3_dir_entry {
 578         __u32   inode;                  /* Inode number */
 579         __u16   rec_len;                /* Directory entry length */
 580         __u16   name_len;               /* Name length */
 581         char    name[EXT3_NAME_LEN];    /* File name */
 582 };
 583
 584 /*
 585  * The new version of the directory entry.  Since EXT3 structures are
 586  * stored in intel byte order, and the name_len field could never be
 587  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 588  * file_type field.
 589  */
 590 struct ext3_dir_entry_2 {
 591         __u32   inode;                  /* Inode number */
 592         __u16   rec_len;                /* Directory entry length */
 593         __u8    name_len;               /* Name length */
 594         __u8    file_type;
 595         char    name[EXT3_NAME_LEN];    /* File name */
 596 };
 597
 598 /*
 599  * Ext3 directory file types.  Only the low 3 bits are used.  The
 600  * other bits are reserved for now.
 601  */
 602 #define EXT3_FT_UNKNOWN         0
 603 #define EXT3_FT_REG_FILE        1
 604 #define EXT3_FT_DIR             2
 605 #define EXT3_FT_CHRDEV          3
 606 #define EXT3_FT_BLKDEV          4
 607 #define EXT3_FT_FIFO            5
 608 #define EXT3_FT_SOCK            6
 609 #define EXT3_FT_SYMLINK         7
 610
 611 #define EXT3_FT_MAX             8
 612
 613 /*
 614  * EXT3_DIR_PAD defines the directory entries boundaries
 615  *
 616  * NOTE: It must be a multiple of 4
 617  */
 618 #define EXT3_DIR_PAD                    4
 619 #define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
 620 #define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
 621                                          ~EXT3_DIR_ROUND)
 622 /*
 623  * Hash Tree Directory indexing
 624  * (c) Daniel Phillips, 2001
 625  */
 626
 627 #ifdef CONFIG_EXT3_INDEX
 628   #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
 629                                               EXT3_FEATURE_COMPAT_DIR_INDEX) && \
 630                       (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
 631 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
 632 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 633 #else
 634   #define is_dx(dir) 0
 635 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
 636 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
 637 #endif
 638
 639 /* Legal values for the dx_root hash_version field: */
 640
 641 #define DX_HASH_LEGACY          0
 642 #define DX_HASH_HALF_MD4        1
 643 #define DX_HASH_TEA             2
 644
 645 /* hash info structure used by the directory hash */
 646 struct dx_hash_info
 647 {
 648         u32             hash;
 649         u32             minor_hash;
 650         int             hash_version;
 651         u32             *seed;
 652 };
 653
 654 #define EXT3_HTREE_EOF  0x7fffffff
 655
 656 #ifdef __KERNEL__
 657 /*
 658  * Control parameters used by ext3_htree_next_block
 659  */
 660 #define HASH_NB_ALWAYS          1
 661
 662
 663 /*
 664  * Describe an inode's exact location on disk and in memory
 665  */
 666 struct ext3_iloc
 667 {
 668         struct buffer_head *bh;
 669         unsigned long offset;
 670         unsigned long block_group;
 671 };
 672
 673 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
 674 {
 675         return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
 676 }
 677
 678 /*
 679  * This structure is stuffed into the struct file's private_data field
 680  * for directories.  It is where we put information so that we can do
 681  * readdir operations in hash tree order.
 682  */
 683 struct dir_private_info {
 684         struct rb_root  root;
 685         struct rb_node  *curr_node;
 686         struct fname    *extra_fname;
 687         loff_t          last_pos;
 688         __u32           curr_hash;
 689         __u32           curr_minor_hash;
 690         __u32           next_hash;
 691 };
 692
 693 /*
 694  * Special error return code only used by dx_probe() and its callers.
 695  */
 696 #define ERR_BAD_DX_DIR  -75000
 697
 698 /*
 699  * Function prototypes
 700  */
 701
 702 /*
 703  * Ok, these declarations are also in <linux/kernel.h> but none of the
 704  * ext3 source programs needs to include it so they are duplicated here.
 705  */
 706 # define NORET_TYPE    /**/
 707 # define ATTRIB_NORET  __attribute__((noreturn))
 708 # define NORET_AND     noreturn,
 709
 710 /* balloc.c */
 711 extern int ext3_bg_has_super(struct super_block *sb, int group);
 712 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
 713 extern int ext3_new_block (handle_t *, struct inode *, unsigned long, int *);
 714 extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
 715                               unsigned long);
 716 extern unsigned long ext3_count_free_blocks (struct super_block *);
 717 extern void ext3_check_blocks_bitmap (struct super_block *);
 718 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
 719                                                     unsigned int block_group,
 720                                                     struct buffer_head ** bh);
 721 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
 722
 723 /* dir.c */
 724 extern int ext3_check_dir_entry(const char *, struct inode *,
 725                                 struct ext3_dir_entry_2 *,
 726                                 struct buffer_head *, unsigned long);
 727 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
 728                                     __u32 minor_hash,
 729                                     struct ext3_dir_entry_2 *dirent);
 730 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
 731
 732 /* fsync.c */
 733 extern int ext3_sync_file (struct file *, struct dentry *, int);
 734
 735 /* hash.c */
 736 extern int ext3fs_dirhash(const char *name, int len, struct
 737                           dx_hash_info *hinfo);
 738
 739 /* ialloc.c */
 740 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
 741 extern void ext3_free_inode (handle_t *, struct inode *);
 742 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
 743 extern unsigned long ext3_count_free_inodes (struct super_block *);
 744 extern unsigned long ext3_count_dirs (struct super_block *);
 745 extern void ext3_check_inodes_bitmap (struct super_block *);
 746 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
 747
 748
 749 /* inode.c */
 750 extern int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
 751 extern struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
 752 extern struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
 753
 754 extern void ext3_read_inode (struct inode *);
 755 extern void ext3_write_inode (struct inode *, int);
 756 extern int  ext3_setattr (struct dentry *, struct iattr *);
 757 extern void ext3_put_inode (struct inode *);
 758 extern void ext3_delete_inode (struct inode *);
 759 extern int  ext3_sync_inode (handle_t *, struct inode *);
 760 extern void ext3_discard_prealloc (struct inode *);
 761 extern void ext3_discard_reservation (struct inode *);
 762 extern void ext3_dirty_inode(struct inode *);
 763 extern int ext3_change_inode_journal_flag(struct inode *, int);
 764 extern void ext3_truncate (struct inode *);
 765 extern void ext3_set_inode_flags(struct inode *);
 766 extern void ext3_set_aops(struct inode *inode);
 767
 768 /* ioctl.c */
 769 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
 770                        unsigned long);
 771
 772 /* namei.c */
 773 extern int ext3_orphan_add(handle_t *, struct inode *);
 774 extern int ext3_orphan_del(handle_t *, struct inode *);
 775 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 776                                 __u32 start_minor_hash, __u32 *next_hash);
 777
 778 /* resize.c */
 779 extern int ext3_group_add(struct super_block *sb,
 780                                 struct ext3_new_group_data *input);
 781 extern int ext3_group_extend(struct super_block *sb,
 782                                 struct ext3_super_block *es,
 783                                 unsigned long n_blocks_count);
 784
 785 /* super.c */
 786 extern void ext3_error (struct super_block *, const char *, const char *, ...)
 787         __attribute__ ((format (printf, 3, 4)));
 788 extern void __ext3_std_error (struct super_block *, const char *, int);
 789 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
 790         __attribute__ ((format (printf, 3, 4)));
 791 extern NORET_TYPE void ext3_panic (struct super_block *, const char *,
 792                                    const char *, ...)
 793         __attribute__ ((NORET_AND format (printf, 3, 4)));
 794 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
 795         __attribute__ ((format (printf, 3, 4)));
 796 extern void ext3_update_dynamic_rev (struct super_block *sb);
 797 extern void ext3_put_super (struct super_block *);
 798 extern void ext3_write_super (struct super_block *);
 799 extern void ext3_write_super_lockfs (struct super_block *);
 800 extern void ext3_unlockfs (struct super_block *);
 801 extern int ext3_remount (struct super_block *, int *, char *);
 802 extern int ext3_statfs (struct super_block *, struct kstatfs *);
 803
 804 #define ext3_std_error(sb, errno)                               \
 805 do {                                                            \
 806         if ((errno))                                            \
 807                 __ext3_std_error((sb), __FUNCTION__, (errno));  \
 808 } while (0)
 809 extern const char *ext3_decode_error(struct super_block *sb, int errno, char nbuf[16]);
 810
 811 /*
 812  * Inodes and files operations
 813  */
 814
 815 /* dir.c */
 816 extern struct file_operations ext3_dir_operations;
 817
 818 /* file.c */
 819 extern struct inode_operations ext3_file_inode_operations;
 820 extern struct file_operations ext3_file_operations;
 821
 822 /* namei.c */
 823 extern struct inode_operations ext3_dir_inode_operations;
 824 extern struct inode_operations ext3_special_inode_operations;
 825
 826 /* symlink.c */
 827 extern struct inode_operations ext3_symlink_inode_operations;
 828 extern struct inode_operations ext3_fast_symlink_inode_operations;
 829
 830
 831 #endif  /* __KERNEL__ */
 832
 833 #endif  /* _LINUX_EXT3_FS_H */