qemu/roms/openbios/fs/ext2/ext2_fs.h

   1 /*
   2  *  This file has been copied from
   3  *  linux/include/linux/ext2_fs.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT2_FS_H
  18 #define _EXT2_FS_H
  19
  20 /* from /usr/include/linux/magic.h */
  21
  22 #define EXT2_SUPER_MAGIC        0xEF53
  23
  24 /*
  25  * The second extended filesystem constants/structures
  26  */
  27
  28 /*
  29  * Define EXT2FS_DEBUG to produce debug messages
  30  */
  31 #undef EXT2FS_DEBUG
  32
  33 /*
  34  * Define EXT2_RESERVATION to reserve data blocks for expanding files
  35  */
  36 #define EXT2_DEFAULT_RESERVE_BLOCKS     8
  37 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  38 #define EXT2_MAX_RESERVE_BLOCKS         1027
  39 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
  40 /*
  41  * The second extended file system version
  42  */
  43 #define EXT2FS_DATE             "95/08/09"
  44 #define EXT2FS_VERSION          "0.5b"
  45
  46 /*
  47  * Debug code
  48  */
  49 #ifdef EXT2FS_DEBUG
  50 #       define ext2_debug(f, a...)      { \
  51                                         printk ("EXT2-fs DEBUG (%s, %d): %s:", \
  52                                                 __FILE__, __LINE__, __FUNCTION__); \
  53                                         printk (f, ## a); \
  54                                         }
  55 #else
  56 #       define ext2_debug(f, a...)      /**/
  57 #endif
  58
  59 /*
  60  * Special inode numbers
  61  */
  62 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  63 #define EXT2_ROOT_INO            2      /* Root inode */
  64 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  65 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  66
  67 /* First non-reserved inode for old ext2 filesystems */
  68 #define EXT2_GOOD_OLD_FIRST_INO 11
  69
  70 /* Assume that user mode programs are passing in an ext2fs superblock, not
  71  * a kernel struct super_block.  This will allow us to call the feature-test
  72  * macros from user land. */
  73 #define EXT2_SB(sb)     (sb)
  74
  75 /*
  76  * Maximal count of links to a file
  77  */
  78 #define EXT2_LINK_MAX           32000
  79
  80 /*
  81  * Macro-instructions used to manage several block sizes
  82  */
  83 #define EXT2_MIN_BLOCK_SIZE             1024
  84 #define EXT2_MAX_BLOCK_SIZE             4096
  85 #define EXT2_MIN_BLOCK_LOG_SIZE           10
  86 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  87 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (uint32_t))
  88 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  89 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  90                                  EXT2_GOOD_OLD_INODE_SIZE : \
  91                                  (s)->s_inode_size)
  92 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  93                                  EXT2_GOOD_OLD_FIRST_INO : \
  94                                  (s)->s_first_ino)
  95
  96 /*
  97  * Macro-instructions used to manage fragments
  98  */
  99 #define EXT2_MIN_FRAG_SIZE              1024
 100 #define EXT2_MAX_FRAG_SIZE              4096
 101 #define EXT2_MIN_FRAG_LOG_SIZE            10
 102 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 103 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 104
 105 /*
 106  * Structure of a blocks group descriptor
 107  */
 108 struct ext2_group_desc
 109 {
 110         uint32_t        bg_block_bitmap;                /* Blocks bitmap block */
 111         uint32_t        bg_inode_bitmap;                /* Inodes bitmap block */
 112         uint32_t        bg_inode_table;         /* Inodes table block */
 113         uint16_t        bg_free_blocks_count;   /* Free blocks count */
 114         uint16_t        bg_free_inodes_count;   /* Free inodes count */
 115         uint16_t        bg_used_dirs_count;     /* Directories count */
 116         uint16_t        bg_pad;
 117         uint32_t        bg_reserved[3];
 118 };
 119
 120 /*
 121  * Macro-instructions used to manage group descriptors
 122  */
 123 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 124 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 125 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 126
 127 /*
 128  * Constants relative to the data blocks
 129  */
 130 #define EXT2_NDIR_BLOCKS                12
 131 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 132 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 133 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 134 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 135
 136 /*
 137  * Inode flags (GETFLAGS/SETFLAGS)
 138  */
 139 #define EXT2_SECRM_FL                   FS_SECRM_FL     /* Secure deletion */
 140 #define EXT2_UNRM_FL                    FS_UNRM_FL      /* Undelete */
 141 #define EXT2_COMPR_FL                   FS_COMPR_FL     /* Compress file */
 142 #define EXT2_SYNC_FL                    FS_SYNC_FL      /* Synchronous updates */
 143 #define EXT2_IMMUTABLE_FL               FS_IMMUTABLE_FL /* Immutable file */
 144 #define EXT2_APPEND_FL                  FS_APPEND_FL    /* writes to file may only append */
 145 #define EXT2_NODUMP_FL                  FS_NODUMP_FL    /* do not dump file */
 146 #define EXT2_NOATIME_FL                 FS_NOATIME_FL   /* do not update atime */
 147 /* Reserved for compression usage... */
 148 #define EXT2_DIRTY_FL                   FS_DIRTY_FL
 149 #define EXT2_COMPRBLK_FL                FS_COMPRBLK_FL  /* One or more compressed clusters */
 150 #define EXT2_NOCOMP_FL                  FS_NOCOMP_FL    /* Don't compress */
 151 #define EXT2_ECOMPR_FL                  FS_ECOMPR_FL    /* Compression error */
 152 /* End compression flags --- maybe not all used */
 153 #define EXT2_BTREE_FL                   FS_BTREE_FL     /* btree format dir */
 154 #define EXT2_INDEX_FL                   FS_INDEX_FL     /* hash-indexed directory */
 155 #define EXT2_IMAGIC_FL                  FS_IMAGIC_FL    /* AFS directory */
 156 #define EXT2_JOURNAL_DATA_FL            FS_JOURNAL_DATA_FL /* Reserved for ext3 */
 157 #define EXT2_NOTAIL_FL                  FS_NOTAIL_FL    /* file tail should not be merged */
 158 #define EXT2_DIRSYNC_FL                 FS_DIRSYNC_FL   /* dirsync behaviour (directories only) */
 159 #define EXT2_TOPDIR_FL                  FS_TOPDIR_FL    /* Top of directory hierarchies*/
 160 #define EXT2_RESERVED_FL                FS_RESERVED_FL  /* reserved for ext2 lib */
 161
 162 #define EXT2_FL_USER_VISIBLE            FS_FL_USER_VISIBLE      /* User visible flags */
 163 #define EXT2_FL_USER_MODIFIABLE         FS_FL_USER_MODIFIABLE   /* User modifiable flags */
 164
 165 /*
 166  * ioctl commands
 167  */
 168 #define EXT2_IOC_GETFLAGS               FS_IOC_GETFLAGS
 169 #define EXT2_IOC_SETFLAGS               FS_IOC_SETFLAGS
 170 #define EXT2_IOC_GETVERSION             FS_IOC_GETVERSION
 171 #define EXT2_IOC_SETVERSION             FS_IOC_SETVERSION
 172 #define EXT2_IOC_GETRSVSZ               _IOR('f', 5, long)
 173 #define EXT2_IOC_SETRSVSZ               _IOW('f', 6, long)
 174
 175 /*
 176  * ioctl commands in 32 bit emulation
 177  */
 178 #define EXT2_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 179 #define EXT2_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 180 #define EXT2_IOC32_GETVERSION           FS_IOC32_GETVERSION
 181 #define EXT2_IOC32_SETVERSION           FS_IOC32_SETVERSION
 182
 183 /*
 184  * Structure of an inode on the disk
 185  */
 186 struct ext2_inode {
 187         uint16_t        i_mode;         /* File mode */
 188         uint16_t        i_uid;          /* Low 16 bits of Owner Uid */
 189         uint32_t        i_size;         /* Size in bytes */
 190         uint32_t        i_atime;        /* Access time */
 191         uint32_t        i_ctime;        /* Creation time */
 192         uint32_t        i_mtime;        /* Modification time */
 193         uint32_t        i_dtime;        /* Deletion Time */
 194         uint16_t        i_gid;          /* Low 16 bits of Group Id */
 195         uint16_t        i_links_count;  /* Links count */
 196         uint32_t        i_blocks;       /* Blocks count */
 197         uint32_t        i_flags;        /* File flags */
 198         union {
 199                 struct {
 200                         uint32_t  l_i_reserved1;
 201                 } linux1;
 202                 struct {
 203                         uint32_t  h_i_translator;
 204                 } hurd1;
 205                 struct {
 206                         uint32_t  m_i_reserved1;
 207                 } masix1;
 208         } osd1;                         /* OS dependent 1 */
 209         uint32_t        i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 210         uint32_t        i_generation;   /* File version (for NFS) */
 211         uint32_t        i_file_acl;     /* File ACL */
 212         uint32_t        i_dir_acl;      /* Directory ACL */
 213         uint32_t        i_faddr;        /* Fragment address */
 214         union {
 215                 struct {
 216                         uint8_t l_i_frag;       /* Fragment number */
 217                         uint8_t l_i_fsize;      /* Fragment size */
 218                         uint16_t        i_pad1;
 219                         uint16_t        l_i_uid_high;   /* these 2 fields    */
 220                         uint16_t        l_i_gid_high;   /* were reserved2[0] */
 221                         uint32_t        l_i_reserved2;
 222                 } linux2;
 223                 struct {
 224                         uint8_t h_i_frag;       /* Fragment number */
 225                         uint8_t h_i_fsize;      /* Fragment size */
 226                         uint16_t        h_i_mode_high;
 227                         uint16_t        h_i_uid_high;
 228                         uint16_t        h_i_gid_high;
 229                         uint32_t        h_i_author;
 230                 } hurd2;
 231                 struct {
 232                         uint8_t m_i_frag;       /* Fragment number */
 233                         uint8_t m_i_fsize;      /* Fragment size */
 234                         uint16_t        m_pad1;
 235                         uint32_t        m_i_reserved2[2];
 236                 } masix2;
 237         } osd2;                         /* OS dependent 2 */
 238 };
 239
 240 #define i_size_high     i_dir_acl
 241
 242 #if defined(__KERNEL__) || defined(__linux__)
 243 #define i_reserved1     osd1.linux1.l_i_reserved1
 244 #define i_frag          osd2.linux2.l_i_frag
 245 #define i_fsize         osd2.linux2.l_i_fsize
 246 #define i_uid_low       i_uid
 247 #define i_gid_low       i_gid
 248 #define i_uid_high      osd2.linux2.l_i_uid_high
 249 #define i_gid_high      osd2.linux2.l_i_gid_high
 250 #define i_reserved2     osd2.linux2.l_i_reserved2
 251 #endif
 252
 253 #ifdef  __hurd__
 254 #define i_translator    osd1.hurd1.h_i_translator
 255 #define i_frag          osd2.hurd2.h_i_frag;
 256 #define i_fsize         osd2.hurd2.h_i_fsize;
 257 #define i_uid_high      osd2.hurd2.h_i_uid_high
 258 #define i_gid_high      osd2.hurd2.h_i_gid_high
 259 #define i_author        osd2.hurd2.h_i_author
 260 #endif
 261
 262 #ifdef  __masix__
 263 #define i_reserved1     osd1.masix1.m_i_reserved1
 264 #define i_frag          osd2.masix2.m_i_frag
 265 #define i_fsize         osd2.masix2.m_i_fsize
 266 #define i_reserved2     osd2.masix2.m_i_reserved2
 267 #endif
 268
 269 /*
 270  * File system states
 271  */
 272 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 273 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 274
 275 /*
 276  * Mount flags
 277  */
 278 #define EXT2_MOUNT_CHECK                0x000001  /* Do mount-time checks */
 279 #define EXT2_MOUNT_OLDALLOC             0x000002  /* Don't use the new Orlov allocator */
 280 #define EXT2_MOUNT_GRPID                0x000004  /* Create files with directory's group */
 281 #define EXT2_MOUNT_DEBUG                0x000008  /* Some debugging messages */
 282 #define EXT2_MOUNT_ERRORS_CONT          0x000010  /* Continue on errors */
 283 #define EXT2_MOUNT_ERRORS_RO            0x000020  /* Remount fs ro on errors */
 284 #define EXT2_MOUNT_ERRORS_PANIC         0x000040  /* Panic on errors */
 285 #define EXT2_MOUNT_MINIX_DF             0x000080  /* Mimics the Minix statfs */
 286 #define EXT2_MOUNT_NOBH                 0x000100  /* No buffer_heads */
 287 #define EXT2_MOUNT_NO_UID32             0x000200  /* Disable 32-bit UIDs */
 288 #define EXT2_MOUNT_XATTR_USER           0x004000  /* Extended user attributes */
 289 #define EXT2_MOUNT_POSIX_ACL            0x008000  /* POSIX Access Control Lists */
 290 #define EXT2_MOUNT_XIP                  0x010000  /* Execute in place */
 291 #define EXT2_MOUNT_USRQUOTA             0x020000  /* user quota */
 292 #define EXT2_MOUNT_GRPQUOTA             0x040000  /* group quota */
 293 #define EXT2_MOUNT_RESERVATION          0x080000  /* Preallocation */
 294
 295
 296 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 297 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 298 #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 299                                          EXT2_MOUNT_##opt)
 300 /*
 301  * Maximal mount counts between two filesystem checks
 302  */
 303 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 304 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 305
 306 /*
 307  * Behaviour when detecting errors
 308  */
 309 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 310 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 311 #define EXT2_ERRORS_PANIC               3       /* Panic */
 312 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 313
 314 /*
 315  * Structure of the super block
 316  */
 317 struct ext2_super_block {
 318         uint32_t        s_inodes_count;         /* Inodes count */
 319         uint32_t        s_blocks_count;         /* Blocks count */
 320         uint32_t        s_r_blocks_count;       /* Reserved blocks count */
 321         uint32_t        s_free_blocks_count;    /* Free blocks count */
 322         uint32_t        s_free_inodes_count;    /* Free inodes count */
 323         uint32_t        s_first_data_block;     /* First Data Block */
 324         uint32_t        s_log_block_size;       /* Block size */
 325         uint32_t        s_log_frag_size;        /* Fragment size */
 326         uint32_t        s_blocks_per_group;     /* # Blocks per group */
 327         uint32_t        s_frags_per_group;      /* # Fragments per group */
 328         uint32_t        s_inodes_per_group;     /* # Inodes per group */
 329         uint32_t        s_mtime;                /* Mount time */
 330         uint32_t        s_wtime;                /* Write time */
 331         uint16_t        s_mnt_count;            /* Mount count */
 332         uint16_t        s_max_mnt_count;        /* Maximal mount count */
 333         uint16_t        s_magic;                /* Magic signature */
 334         uint16_t        s_state;                /* File system state */
 335         uint16_t        s_errors;               /* Behaviour when detecting errors */
 336         uint16_t        s_minor_rev_level;      /* minor revision level */
 337         uint32_t        s_lastcheck;            /* time of last check */
 338         uint32_t        s_checkinterval;        /* max. time between checks */
 339         uint32_t        s_creator_os;           /* OS */
 340         uint32_t        s_rev_level;            /* Revision level */
 341         uint16_t        s_def_resuid;           /* Default uid for reserved blocks */
 342         uint16_t        s_def_resgid;           /* Default gid for reserved blocks */
 343         /*
 344          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 345          *
 346          * Note: the difference between the compatible feature set and
 347          * the incompatible feature set is that if there is a bit set
 348          * in the incompatible feature set that the kernel doesn't
 349          * know about, it should refuse to mount the filesystem.
 350          *
 351          * e2fsck's requirements are more strict; if it doesn't know
 352          * about a feature in either the compatible or incompatible
 353          * feature set, it must abort and not try to meddle with
 354          * things it doesn't understand...
 355          */
 356         uint32_t        s_first_ino;            /* First non-reserved inode */
 357         uint16_t   s_inode_size;                /* size of inode structure */
 358         uint16_t        s_block_group_nr;       /* block group # of this superblock */
 359         uint32_t        s_feature_compat;       /* compatible feature set */
 360         uint32_t        s_feature_incompat;     /* incompatible feature set */
 361         uint32_t        s_feature_ro_compat;    /* readonly-compatible feature set */
 362         uint8_t s_uuid[16];             /* 128-bit uuid for volume */
 363         char    s_volume_name[16];      /* volume name */
 364         char    s_last_mounted[64];     /* directory where last mounted */
 365         uint32_t        s_algorithm_usage_bitmap; /* For compression */
 366         /*
 367          * Performance hints.  Directory preallocation should only
 368          * happen if the EXT2_COMPAT_PREALLOC flag is on.
 369          */
 370         uint8_t s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 371         uint8_t s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 372         uint16_t        s_padding1;
 373         /*
 374          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 375          */
 376         uint8_t s_journal_uuid[16];     /* uuid of journal superblock */
 377         uint32_t        s_journal_inum;         /* inode number of journal file */
 378         uint32_t        s_journal_dev;          /* device number of journal file */
 379         uint32_t        s_last_orphan;          /* start of list of inodes to delete */
 380         uint32_t        s_hash_seed[4];         /* HTREE hash seed */
 381         uint8_t s_def_hash_version;     /* Default hash version to use */
 382         uint8_t s_reserved_char_pad;
 383         uint16_t        s_reserved_word_pad;
 384         uint32_t        s_default_mount_opts;
 385         uint32_t        s_first_meta_bg;        /* First metablock block group */
 386         uint32_t        s_reserved[190];        /* Padding to the end of the block */
 387 };
 388
 389 /*
 390  * Codes for operating systems
 391  */
 392 #define EXT2_OS_LINUX           0
 393 #define EXT2_OS_HURD            1
 394 #define EXT2_OS_MASIX           2
 395 #define EXT2_OS_FREEBSD         3
 396 #define EXT2_OS_LITES           4
 397
 398 /*
 399  * Revision levels
 400  */
 401 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 402 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 403
 404 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 405 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 406
 407 #define EXT2_GOOD_OLD_INODE_SIZE 128
 408
 409 /*
 410  * Feature set definitions
 411  */
 412
 413 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 414         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 415 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 416         ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 417 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 418         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 419 #define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
 420         EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 421 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 422         EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 423 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
 424         EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 425 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 426         EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 427 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 428         EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 429 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 430         EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 431
 432 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 433 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 434 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 435 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 436 #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
 437 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 438 #define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
 439
 440 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 441 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 442 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 443 #define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
 444
 445 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 446 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 447 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
 448 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
 449 #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 450 #define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
 451
 452 #define EXT2_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 453 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
 454                                          EXT2_FEATURE_INCOMPAT_META_BG)
 455 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 456                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 457                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 458 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
 459 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
 460
 461 /*
 462  * Default values for user and/or group using reserved blocks
 463  */
 464 #define EXT2_DEF_RESUID         0
 465 #define EXT2_DEF_RESGID         0
 466
 467 /*
 468  * Default mount options
 469  */
 470 #define EXT2_DEFM_DEBUG         0x0001
 471 #define EXT2_DEFM_BSDGROUPS     0x0002
 472 #define EXT2_DEFM_XATTR_USER    0x0004
 473 #define EXT2_DEFM_ACL           0x0008
 474 #define EXT2_DEFM_UID16         0x0010
 475     /* Not used by ext2, but reserved for use by ext3 */
 476 #define EXT3_DEFM_JMODE         0x0060
 477 #define EXT3_DEFM_JMODE_DATA    0x0020
 478 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 479 #define EXT3_DEFM_JMODE_WBACK   0x0060
 480
 481 /*
 482  * Structure of a directory entry
 483  */
 484 #define EXT2_NAME_LEN 255
 485
 486 struct ext2_dir_entry {
 487         uint32_t        inode;                  /* Inode number */
 488         uint16_t        rec_len;                /* Directory entry length */
 489         uint16_t        name_len;               /* Name length */
 490         char    name[EXT2_NAME_LEN];    /* File name */
 491 };
 492
 493 /*
 494  * The new version of the directory entry.  Since EXT2 structures are
 495  * stored in intel byte order, and the name_len field could never be
 496  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 497  * file_type field.
 498  */
 499 struct ext2_dir_entry_2 {
 500         uint32_t        inode;                  /* Inode number */
 501         uint16_t        rec_len;                /* Directory entry length */
 502         uint8_t name_len;               /* Name length */
 503         uint8_t file_type;
 504         char    name[EXT2_NAME_LEN];    /* File name */
 505 };
 506
 507 /*
 508  * Ext2 directory file types.  Only the low 3 bits are used.  The
 509  * other bits are reserved for now.
 510  */
 511 enum {
 512         EXT2_FT_UNKNOWN,
 513         EXT2_FT_REG_FILE,
 514         EXT2_FT_DIR,
 515         EXT2_FT_CHRDEV,
 516         EXT2_FT_BLKDEV,
 517         EXT2_FT_FIFO,
 518         EXT2_FT_SOCK,
 519         EXT2_FT_SYMLINK,
 520         EXT2_FT_MAX
 521 };
 522
 523 /*
 524  * EXT2_DIR_PAD defines the directory entries boundaries
 525  *
 526  * NOTE: It must be a multiple of 4
 527  */
 528 #define EXT2_DIR_PAD                    4
 529 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 530 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 531                                          ~EXT2_DIR_ROUND)
 532 #define EXT2_MAX_REC_LEN                ((1<<16)-1)
 533
 534 #endif  /* _EXT2_FS_H */