include/linux/ext2_fs.h

   1 /*
   2  *  linux/include/linux/ext2_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_EXT2_FS_H
  17 #define _LINUX_EXT2_FS_H
  18
  19 #include <linux/types.h>
  20 #include <linux/ext2_fs_sb.h>
  21
  22 /*
  23  * The second extended filesystem constants/structures
  24  */
  25
  26 /*
  27  * Define EXT2FS_DEBUG to produce debug messages
  28  */
  29 #undef EXT2FS_DEBUG
  30
  31 /*
  32  * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
  33  */
  34 #define EXT2_PREALLOCATE
  35 #define EXT2_DEFAULT_PREALLOC_BLOCKS    8
  36
  37 /*
  38  * The second extended file system version
  39  */
  40 #define EXT2FS_DATE             "95/08/09"
  41 #define EXT2FS_VERSION          "0.5b"
  42
  43 /*
  44  * Debug code
  45  */
  46 #ifdef EXT2FS_DEBUG
  47 #       define ext2_debug(f, a...)      { \
  48                                         printk ("EXT2-fs DEBUG (%s, %d): %s:", \
  49                                                 __FILE__, __LINE__, __FUNCTION__); \
  50                                         printk (f, ## a); \
  51                                         }
  52 #else
  53 #       define ext2_debug(f, a...)      /**/
  54 #endif
  55
  56 /*
  57  * Special inode numbers
  58  */
  59 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  60 #define EXT2_ROOT_INO            2      /* Root inode */
  61 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  62 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  63
  64 /* First non-reserved inode for old ext2 filesystems */
  65 #define EXT2_GOOD_OLD_FIRST_INO 11
  66
  67 /*
  68  * The second extended file system magic number
  69  */
  70 #define EXT2_SUPER_MAGIC        0xEF53
  71
  72 #ifdef __KERNEL__
  73 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
  74 {
  75         return sb->s_fs_info;
  76 }
  77 #else
  78 /* Assume that user mode programs are passing in an ext2fs superblock, not
  79  * a kernel struct super_block.  This will allow us to call the feature-test
  80  * macros from user land. */
  81 #define EXT2_SB(sb)     (sb)
  82 #endif
  83
  84 /*
  85  * Maximal count of links to a file
  86  */
  87 #define EXT2_LINK_MAX           32000
  88
  89 /*
  90  * Macro-instructions used to manage several block sizes
  91  */
  92 #define EXT2_MIN_BLOCK_SIZE             1024
  93 #define EXT2_MAX_BLOCK_SIZE             4096
  94 #define EXT2_MIN_BLOCK_LOG_SIZE           10
  95 #ifdef __KERNEL__
  96 # define EXT2_BLOCK_SIZE(s)             ((s)->s_blocksize)
  97 #else
  98 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  99 #endif
 100 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
 101 #ifdef __KERNEL__
 102 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 103 #else
 104 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 105 #endif
 106 #ifdef __KERNEL__
 107 #define EXT2_ADDR_PER_BLOCK_BITS(s)     (EXT2_SB(s)->s_addr_per_block_bits)
 108 #define EXT2_INODE_SIZE(s)              (EXT2_SB(s)->s_inode_size)
 109 #define EXT2_FIRST_INO(s)               (EXT2_SB(s)->s_first_ino)
 110 #else
 111 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
 112                                  EXT2_GOOD_OLD_INODE_SIZE : \
 113                                  (s)->s_inode_size)
 114 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
 115                                  EXT2_GOOD_OLD_FIRST_INO : \
 116                                  (s)->s_first_ino)
 117 #endif
 118
 119 /*
 120  * Macro-instructions used to manage fragments
 121  */
 122 #define EXT2_MIN_FRAG_SIZE              1024
 123 #define EXT2_MAX_FRAG_SIZE              4096
 124 #define EXT2_MIN_FRAG_LOG_SIZE            10
 125 #ifdef __KERNEL__
 126 # define EXT2_FRAG_SIZE(s)              (EXT2_SB(s)->s_frag_size)
 127 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_SB(s)->s_frags_per_block)
 128 #else
 129 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 130 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 131 #endif
 132
 133 /*
 134  * Structure of a blocks group descriptor
 135  */
 136 struct ext2_group_desc
 137 {
 138         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 139         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 140         __u32   bg_inode_table;         /* Inodes table block */
 141         __u16   bg_free_blocks_count;   /* Free blocks count */
 142         __u16   bg_free_inodes_count;   /* Free inodes count */
 143         __u16   bg_used_dirs_count;     /* Directories count */
 144         __u16   bg_pad;
 145         __u32   bg_reserved[3];
 146 };
 147
 148 /*
 149  * Macro-instructions used to manage group descriptors
 150  */
 151 #ifdef __KERNEL__
 152 # define EXT2_BLOCKS_PER_GROUP(s)       (EXT2_SB(s)->s_blocks_per_group)
 153 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_SB(s)->s_desc_per_block)
 154 # define EXT2_INODES_PER_GROUP(s)       (EXT2_SB(s)->s_inodes_per_group)
 155 # define EXT2_DESC_PER_BLOCK_BITS(s)    (EXT2_SB(s)->s_desc_per_block_bits)
 156 #else
 157 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 158 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 159 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 160 #endif
 161
 162 /*
 163  * Constants relative to the data blocks
 164  */
 165 #define EXT2_NDIR_BLOCKS                12
 166 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 167 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 168 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 169 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 170
 171 /*
 172  * Inode flags
 173  */
 174 #define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 175 #define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 176 #define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 177 #define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 178 #define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 179 #define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 180 #define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 181 #define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 182 /* Reserved for compression usage... */
 183 #define EXT2_DIRTY_FL                   0x00000100
 184 #define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 185 #define EXT2_NOCOMP_FL                  0x00000400 /* Don't compress */
 186 #define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 187 /* End compression flags --- maybe not all used */
 188 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 189 #define EXT2_INDEX_FL                   0x00001000 /* hash-indexed directory */
 190 #define EXT2_IMAGIC_FL                  0x00002000 /* AFS directory */
 191 #define EXT2_JOURNAL_DATA_FL            0x00004000 /* Reserved for ext3 */
 192 #define EXT2_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 193 #define EXT2_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 194 #define EXT2_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 195 #define EXT2_BARRIER_FL                 0x04000000 /* Barrier for chroot() */
 196 #define EXT2_IUNLINK_FL                 0x08000000 /* Immutable unlink */
 197 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 198
 199 #define EXT2_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 200 #define EXT2_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
 201
 202 /*
 203  * ioctl commands
 204  */
 205 #define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 206 #define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 207 #define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 208 #define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 209
 210 /*
 211  * Structure of an inode on the disk
 212  */
 213 struct ext2_inode {
 214         __u16   i_mode;         /* File mode */
 215         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 216         __u32   i_size;         /* Size in bytes */
 217         __u32   i_atime;        /* Access time */
 218         __u32   i_ctime;        /* Creation time */
 219         __u32   i_mtime;        /* Modification time */
 220         __u32   i_dtime;        /* Deletion Time */
 221         __u16   i_gid;          /* Low 16 bits of Group Id */
 222         __u16   i_links_count;  /* Links count */
 223         __u32   i_blocks;       /* Blocks count */
 224         __u32   i_flags;        /* File flags */
 225         union {
 226                 struct {
 227                         __u32  l_i_reserved1;
 228                 } linux1;
 229                 struct {
 230                         __u32  h_i_translator;
 231                 } hurd1;
 232                 struct {
 233                         __u32  m_i_reserved1;
 234                 } masix1;
 235         } osd1;                         /* OS dependent 1 */
 236         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 237         __u32   i_generation;   /* File version (for NFS) */
 238         __u32   i_file_acl;     /* File ACL */
 239         __u32   i_dir_acl;      /* Directory ACL */
 240         __u32   i_faddr;        /* Fragment address */
 241         union {
 242                 struct {
 243                         __u8    l_i_frag;       /* Fragment number */
 244                         __u8    l_i_fsize;      /* Fragment size */
 245                         __u16   l_i_xid;        /* LRU Context */
 246                         __u16   l_i_uid_high;   /* these 2 fields    */
 247                         __u16   l_i_gid_high;   /* were reserved2[0] */
 248                         __u32   l_i_reserved2;
 249                 } linux2;
 250                 struct {
 251                         __u8    h_i_frag;       /* Fragment number */
 252                         __u8    h_i_fsize;      /* Fragment size */
 253                         __u16   h_i_mode_high;
 254                         __u16   h_i_uid_high;
 255                         __u16   h_i_gid_high;
 256                         __u32   h_i_author;
 257                 } hurd2;
 258                 struct {
 259                         __u8    m_i_frag;       /* Fragment number */
 260                         __u8    m_i_fsize;      /* Fragment size */
 261                         __u16   m_pad1;
 262                         __u32   m_i_reserved2[2];
 263                 } masix2;
 264         } osd2;                         /* OS dependent 2 */
 265 };
 266
 267 #define i_size_high     i_dir_acl
 268
 269 #if defined(__KERNEL__) || defined(__linux__)
 270 #define i_reserved1     osd1.linux1.l_i_reserved1
 271 #define i_frag          osd2.linux2.l_i_frag
 272 #define i_fsize         osd2.linux2.l_i_fsize
 273 #define i_uid_low       i_uid
 274 #define i_gid_low       i_gid
 275 #define i_uid_high      osd2.linux2.l_i_uid_high
 276 #define i_gid_high      osd2.linux2.l_i_gid_high
 277 #define i_raw_xid       osd2.linux2.l_i_xid
 278 #define i_reserved2     osd2.linux2.l_i_reserved2
 279 #endif
 280
 281 #ifdef  __hurd__
 282 #define i_translator    osd1.hurd1.h_i_translator
 283 #define i_frag          osd2.hurd2.h_i_frag;
 284 #define i_fsize         osd2.hurd2.h_i_fsize;
 285 #define i_uid_high      osd2.hurd2.h_i_uid_high
 286 #define i_gid_high      osd2.hurd2.h_i_gid_high
 287 #define i_author        osd2.hurd2.h_i_author
 288 #endif
 289
 290 #ifdef  __masix__
 291 #define i_reserved1     osd1.masix1.m_i_reserved1
 292 #define i_frag          osd2.masix2.m_i_frag
 293 #define i_fsize         osd2.masix2.m_i_fsize
 294 #define i_reserved2     osd2.masix2.m_i_reserved2
 295 #endif
 296
 297 /*
 298  * File system states
 299  */
 300 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 301 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 302
 303 /*
 304  * Mount flags
 305  */
 306 #define EXT2_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 307 #define EXT2_MOUNT_OLDALLOC             0x0002  /* Don't use the new Orlov allocator */
 308 #define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 309 #define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 310 #define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 311 #define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 312 #define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 313 #define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 314 #define EXT2_MOUNT_NOBH                 0x0100  /* No buffer_heads */
 315 #define EXT2_MOUNT_NO_UID32             0x0200  /* Disable 32-bit UIDs */
 316 #define EXT2_MOUNT_XATTR_USER           0x4000  /* Extended user attributes */
 317 #define EXT2_MOUNT_POSIX_ACL            0x8000  /* POSIX Access Control Lists */
 318 #define EXT2_MOUNT_TAG_XID              (1<<16) /* Enable Context Tags */
 319
 320 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 321 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 322 #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 323                                          EXT2_MOUNT_##opt)
 324 /*
 325  * Maximal mount counts between two filesystem checks
 326  */
 327 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 328 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 329
 330 /*
 331  * Behaviour when detecting errors
 332  */
 333 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 334 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 335 #define EXT2_ERRORS_PANIC               3       /* Panic */
 336 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 337
 338 /*
 339  * Structure of the super block
 340  */
 341 struct ext2_super_block {
 342         __u32   s_inodes_count;         /* Inodes count */
 343         __u32   s_blocks_count;         /* Blocks count */
 344         __u32   s_r_blocks_count;       /* Reserved blocks count */
 345         __u32   s_free_blocks_count;    /* Free blocks count */
 346         __u32   s_free_inodes_count;    /* Free inodes count */
 347         __u32   s_first_data_block;     /* First Data Block */
 348         __u32   s_log_block_size;       /* Block size */
 349         __s32   s_log_frag_size;        /* Fragment size */
 350         __u32   s_blocks_per_group;     /* # Blocks per group */
 351         __u32   s_frags_per_group;      /* # Fragments per group */
 352         __u32   s_inodes_per_group;     /* # Inodes per group */
 353         __u32   s_mtime;                /* Mount time */
 354         __u32   s_wtime;                /* Write time */
 355         __u16   s_mnt_count;            /* Mount count */
 356         __s16   s_max_mnt_count;        /* Maximal mount count */
 357         __u16   s_magic;                /* Magic signature */
 358         __u16   s_state;                /* File system state */
 359         __u16   s_errors;               /* Behaviour when detecting errors */
 360         __u16   s_minor_rev_level;      /* minor revision level */
 361         __u32   s_lastcheck;            /* time of last check */
 362         __u32   s_checkinterval;        /* max. time between checks */
 363         __u32   s_creator_os;           /* OS */
 364         __u32   s_rev_level;            /* Revision level */
 365         __u16   s_def_resuid;           /* Default uid for reserved blocks */
 366         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 367         /*
 368          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 369          *
 370          * Note: the difference between the compatible feature set and
 371          * the incompatible feature set is that if there is a bit set
 372          * in the incompatible feature set that the kernel doesn't
 373          * know about, it should refuse to mount the filesystem.
 374          *
 375          * e2fsck's requirements are more strict; if it doesn't know
 376          * about a feature in either the compatible or incompatible
 377          * feature set, it must abort and not try to meddle with
 378          * things it doesn't understand...
 379          */
 380         __u32   s_first_ino;            /* First non-reserved inode */
 381         __u16   s_inode_size;           /* size of inode structure */
 382         __u16   s_block_group_nr;       /* block group # of this superblock */
 383         __u32   s_feature_compat;       /* compatible feature set */
 384         __u32   s_feature_incompat;     /* incompatible feature set */
 385         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 386         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 387         char    s_volume_name[16];      /* volume name */
 388         char    s_last_mounted[64];     /* directory where last mounted */
 389         __u32   s_algorithm_usage_bitmap; /* For compression */
 390         /*
 391          * Performance hints.  Directory preallocation should only
 392          * happen if the EXT2_COMPAT_PREALLOC flag is on.
 393          */
 394         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 395         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 396         __u16   s_padding1;
 397         /*
 398          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 399          */
 400         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 401         __u32   s_journal_inum;         /* inode number of journal file */
 402         __u32   s_journal_dev;          /* device number of journal file */
 403         __u32   s_last_orphan;          /* start of list of inodes to delete */
 404         __u32   s_hash_seed[4];         /* HTREE hash seed */
 405         __u8    s_def_hash_version;     /* Default hash version to use */
 406         __u8    s_reserved_char_pad;
 407         __u16   s_reserved_word_pad;
 408         __u32   s_default_mount_opts;
 409         __u32   s_first_meta_bg;        /* First metablock block group */
 410         __u32   s_reserved[190];        /* Padding to the end of the block */
 411 };
 412
 413 /*
 414  * Codes for operating systems
 415  */
 416 #define EXT2_OS_LINUX           0
 417 #define EXT2_OS_HURD            1
 418 #define EXT2_OS_MASIX           2
 419 #define EXT2_OS_FREEBSD         3
 420 #define EXT2_OS_LITES           4
 421
 422 /*
 423  * Revision levels
 424  */
 425 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 426 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 427
 428 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 429 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 430
 431 #define EXT2_GOOD_OLD_INODE_SIZE 128
 432
 433 /*
 434  * Feature set definitions
 435  */
 436
 437 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 438         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 439 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 440         ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 441 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 442         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 443 #define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
 444         EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 445 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 446         EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 447 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
 448         EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 449 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 450         EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 451 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 452         EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 453 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 454         EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 455
 456 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 457 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 458 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 459 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 460 #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
 461 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 462 #define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
 463
 464 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 465 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 466 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 467 #define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
 468
 469 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 470 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 471 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
 472 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
 473 #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 474 #define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
 475
 476 #define EXT2_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 477 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
 478                                          EXT2_FEATURE_INCOMPAT_META_BG)
 479 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 480                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 481                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 482 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
 483 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
 484
 485 /*
 486  * Default values for user and/or group using reserved blocks
 487  */
 488 #define EXT2_DEF_RESUID         0
 489 #define EXT2_DEF_RESGID         0
 490
 491 /*
 492  * Default mount options
 493  */
 494 #define EXT2_DEFM_DEBUG         0x0001
 495 #define EXT2_DEFM_BSDGROUPS     0x0002
 496 #define EXT2_DEFM_XATTR_USER    0x0004
 497 #define EXT2_DEFM_ACL           0x0008
 498 #define EXT2_DEFM_UID16         0x0010
 499     /* Not used by ext2, but reserved for use by ext3 */
 500 #define EXT3_DEFM_JMODE         0x0060
 501 #define EXT3_DEFM_JMODE_DATA    0x0020
 502 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 503 #define EXT3_DEFM_JMODE_WBACK   0x0060
 504
 505 /*
 506  * Structure of a directory entry
 507  */
 508 #define EXT2_NAME_LEN 255
 509
 510 struct ext2_dir_entry {
 511         __u32   inode;                  /* Inode number */
 512         __u16   rec_len;                /* Directory entry length */
 513         __u16   name_len;               /* Name length */
 514         char    name[EXT2_NAME_LEN];    /* File name */
 515 };
 516
 517 /*
 518  * The new version of the directory entry.  Since EXT2 structures are
 519  * stored in intel byte order, and the name_len field could never be
 520  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 521  * file_type field.
 522  */
 523 struct ext2_dir_entry_2 {
 524         __u32   inode;                  /* Inode number */
 525         __u16   rec_len;                /* Directory entry length */
 526         __u8    name_len;               /* Name length */
 527         __u8    file_type;
 528         char    name[EXT2_NAME_LEN];    /* File name */
 529 };
 530
 531 /*
 532  * Ext2 directory file types.  Only the low 3 bits are used.  The
 533  * other bits are reserved for now.
 534  */
 535 enum {
 536         EXT2_FT_UNKNOWN,
 537         EXT2_FT_REG_FILE,
 538         EXT2_FT_DIR,
 539         EXT2_FT_CHRDEV,
 540         EXT2_FT_BLKDEV,
 541         EXT2_FT_FIFO,
 542         EXT2_FT_SOCK,
 543         EXT2_FT_SYMLINK,
 544         EXT2_FT_MAX
 545 };
 546
 547 /*
 548  * EXT2_DIR_PAD defines the directory entries boundaries
 549  *
 550  * NOTE: It must be a multiple of 4
 551  */
 552 #define EXT2_DIR_PAD                    4
 553 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 554 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 555                                          ~EXT2_DIR_ROUND)
 556
 557 #endif  /* _LINUX_EXT2_FS_H */