release/src/router/busybox/e2fsprogs/old_e2fsprogs/ext2fs/ext2_fs.h

   1 /* vi: set sw=4 ts=4: */
   2 /*
   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 #ifndef LINUX_EXT2_FS_H
  17 #define LINUX_EXT2_FS_H 1
  18
  19 #include "ext2_types.h"         /* Changed from linux/types.h */
  20
  21 /*
  22  * Special inode numbers
  23  */
  24 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  25 #define EXT2_ROOT_INO            2      /* Root inode */
  26 #define EXT2_ACL_IDX_INO         3      /* ACL inode */
  27 #define EXT2_ACL_DATA_INO        4      /* ACL inode */
  28 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  29 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  30 #define EXT2_RESIZE_INO          7      /* Reserved group descriptors inode */
  31 #define EXT2_JOURNAL_INO         8      /* Journal inode */
  32
  33 /* First non-reserved inode for old ext2 filesystems */
  34 #define EXT2_GOOD_OLD_FIRST_INO 11
  35
  36 /*
  37  * The second extended file system magic number
  38  */
  39 #define EXT2_SUPER_MAGIC        0xEF53
  40
  41 /* Assume that user mode programs are passing in an ext2fs superblock, not
  42  * a kernel struct super_block.  This will allow us to call the feature-test
  43  * macros from user land. */
  44 #define EXT2_SB(sb)     (sb)
  45
  46 /*
  47  * Maximal count of links to a file
  48  */
  49 #define EXT2_LINK_MAX           32000
  50
  51 /*
  52  * Macro-instructions used to manage several block sizes
  53  */
  54 #define EXT2_MIN_BLOCK_LOG_SIZE         10      /* 1024 */
  55 #define EXT2_MAX_BLOCK_LOG_SIZE         16      /* 65536 */
  56 #define EXT2_MIN_BLOCK_SIZE     (1 << EXT2_MIN_BLOCK_LOG_SIZE)
  57 #define EXT2_MAX_BLOCK_SIZE     (1 << EXT2_MAX_BLOCK_LOG_SIZE)
  58 #define EXT2_BLOCK_SIZE(s)      (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  59 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
  60 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  61                                  EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
  62 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  63                                  EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
  64 #define EXT2_ADDR_PER_BLOCK(s)  (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
  65
  66 /*
  67  * Macro-instructions used to manage fragments
  68  */
  69 #define EXT2_MIN_FRAG_SIZE              EXT2_MIN_BLOCK_SIZE
  70 #define EXT2_MAX_FRAG_SIZE              EXT2_MAX_BLOCK_SIZE
  71 #define EXT2_MIN_FRAG_LOG_SIZE          EXT2_MIN_BLOCK_LOG_SIZE
  72 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
  73 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
  74
  75 /*
  76  * ACL structures
  77  */
  78 struct ext2_acl_header  /* Header of Access Control Lists */
  79 {
  80         __u32   aclh_size;
  81         __u32   aclh_file_count;
  82         __u32   aclh_acle_count;
  83         __u32   aclh_first_acle;
  84 };
  85
  86 struct ext2_acl_entry   /* Access Control List Entry */
  87 {
  88         __u32   acle_size;
  89         __u16   acle_perms;     /* Access permissions */
  90         __u16   acle_type;      /* Type of entry */
  91         __u16   acle_tag;       /* User or group identity */
  92         __u16   acle_pad1;
  93         __u32   acle_next;      /* Pointer on next entry for the */
  94                                         /* same inode or on next free entry */
  95 };
  96
  97 /*
  98  * Structure of a blocks group descriptor
  99  */
 100 struct ext2_group_desc
 101 {
 102         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 103         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 104         __u32   bg_inode_table;         /* Inodes table block */
 105         __u16   bg_free_blocks_count;   /* Free blocks count */
 106         __u16   bg_free_inodes_count;   /* Free inodes count */
 107         __u16   bg_used_dirs_count;     /* Directories count */
 108         __u16   bg_pad;
 109         __u32   bg_reserved[3];
 110 };
 111
 112 /*
 113  * Data structures used by the directory indexing feature
 114  *
 115  * Note: all of the multibyte integer fields are little endian.
 116  */
 117
 118 /*
 119  * Note: dx_root_info is laid out so that if it should somehow get
 120  * overlaid by a dirent the two low bits of the hash version will be
 121  * zero.  Therefore, the hash version mod 4 should never be 0.
 122  * Sincerely, the paranoia department.
 123  */
 124 struct ext2_dx_root_info {
 125         __u32 reserved_zero;
 126         __u8 hash_version; /* 0 now, 1 at release */
 127         __u8 info_length; /* 8 */
 128         __u8 indirect_levels;
 129         __u8 unused_flags;
 130 };
 131
 132 #define EXT2_HASH_LEGACY        0
 133 #define EXT2_HASH_HALF_MD4      1
 134 #define EXT2_HASH_TEA           2
 135
 136 #define EXT2_HASH_FLAG_INCOMPAT 0x1
 137
 138 struct ext2_dx_entry {
 139         __u32 hash;
 140         __u32 block;
 141 };
 142
 143 struct ext2_dx_countlimit {
 144         __u16 limit;
 145         __u16 count;
 146 };
 147
 148
 149 /*
 150  * Macro-instructions used to manage group descriptors
 151  */
 152 #define EXT2_BLOCKS_PER_GROUP(s)        (EXT2_SB(s)->s_blocks_per_group)
 153 #define EXT2_INODES_PER_GROUP(s)        (EXT2_SB(s)->s_inodes_per_group)
 154 #define EXT2_INODES_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
 155 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
 156 #define EXT2_MAX_BLOCKS_PER_GROUP(s)    ((1 << 16) - 8)
 157 #define EXT2_MAX_INODES_PER_GROUP(s)    ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
 158 #define EXT2_DESC_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 159
 160 /*
 161  * Constants relative to the data blocks
 162  */
 163 #define EXT2_NDIR_BLOCKS                12
 164 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 165 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 166 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 167 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 168
 169 /*
 170  * Inode flags
 171  */
 172 #define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 173 #define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 174 #define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 175 #define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 176 #define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 177 #define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 178 #define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 179 #define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 180 /* Reserved for compression usage... */
 181 #define EXT2_DIRTY_FL                   0x00000100
 182 #define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 183 #define EXT2_NOCOMPR_FL                 0x00000400 /* Access raw compressed data */
 184 #define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 185 /* End compression flags --- maybe not all used */
 186 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 187 #define EXT2_INDEX_FL                   0x00001000 /* hash-indexed directory */
 188 #define EXT2_IMAGIC_FL                  0x00002000
 189 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 190 #define EXT2_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 191 #define EXT2_DIRSYNC_FL                 0x00010000 /* Synchronous directory modifications */
 192 #define EXT2_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 193 #define EXT3_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 194 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 195
 196 #define EXT2_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 197 #define EXT2_FL_USER_MODIFIABLE         0x000080FF /* User modifiable flags */
 198
 199 /*
 200  * ioctl commands
 201  */
 202 #define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 203 #define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 204 #define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 205 #define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 206
 207 /*
 208  * Structure of an inode on the disk
 209  */
 210 struct ext2_inode {
 211         __u16   i_mode;         /* File mode */
 212         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 213         __u32   i_size;         /* Size in bytes */
 214         __u32   i_atime;        /* Access time */
 215         __u32   i_ctime;        /* Creation time */
 216         __u32   i_mtime;        /* Modification time */
 217         __u32   i_dtime;        /* Deletion Time */
 218         __u16   i_gid;          /* Low 16 bits of Group Id */
 219         __u16   i_links_count;  /* Links count */
 220         __u32   i_blocks;       /* Blocks count */
 221         __u32   i_flags;        /* File flags */
 222         union {
 223                 struct {
 224                         __u32  l_i_reserved1;
 225                 } linux1;
 226                 struct {
 227                         __u32  h_i_translator;
 228                 } hurd1;
 229                 struct {
 230                         __u32  m_i_reserved1;
 231                 } masix1;
 232         } osd1;                         /* OS dependent 1 */
 233         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 234         __u32   i_generation;   /* File version (for NFS) */
 235         __u32   i_file_acl;     /* File ACL */
 236         __u32   i_dir_acl;      /* Directory ACL */
 237         __u32   i_faddr;        /* Fragment address */
 238         union {
 239                 struct {
 240                         __u8    l_i_frag;       /* Fragment number */
 241                         __u8    l_i_fsize;      /* Fragment size */
 242                         __u16   i_pad1;
 243                         __u16   l_i_uid_high;   /* these 2 fields    */
 244                         __u16   l_i_gid_high;   /* were reserved2[0] */
 245                         __u32   l_i_reserved2;
 246                 } linux2;
 247                 struct {
 248                         __u8    h_i_frag;       /* Fragment number */
 249                         __u8    h_i_fsize;      /* Fragment size */
 250                         __u16   h_i_mode_high;
 251                         __u16   h_i_uid_high;
 252                         __u16   h_i_gid_high;
 253                         __u32   h_i_author;
 254                 } hurd2;
 255                 struct {
 256                         __u8    m_i_frag;       /* Fragment number */
 257                         __u8    m_i_fsize;      /* Fragment size */
 258                         __u16   m_pad1;
 259                         __u32   m_i_reserved2[2];
 260                 } masix2;
 261         } osd2;                         /* OS dependent 2 */
 262 };
 263
 264 /*
 265  * Permanent part of an large inode on the disk
 266  */
 267 struct ext2_inode_large {
 268         __u16   i_mode;         /* File mode */
 269         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 270         __u32   i_size;         /* Size in bytes */
 271         __u32   i_atime;        /* Access time */
 272         __u32   i_ctime;        /* Creation time */
 273         __u32   i_mtime;        /* Modification time */
 274         __u32   i_dtime;        /* Deletion Time */
 275         __u16   i_gid;          /* Low 16 bits of Group Id */
 276         __u16   i_links_count;  /* Links count */
 277         __u32   i_blocks;       /* Blocks count */
 278         __u32   i_flags;        /* File flags */
 279         union {
 280                 struct {
 281                         __u32  l_i_reserved1;
 282                 } linux1;
 283                 struct {
 284                         __u32  h_i_translator;
 285                 } hurd1;
 286                 struct {
 287                         __u32  m_i_reserved1;
 288                 } masix1;
 289         } osd1;                         /* OS dependent 1 */
 290         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 291         __u32   i_generation;   /* File version (for NFS) */
 292         __u32   i_file_acl;     /* File ACL */
 293         __u32   i_dir_acl;      /* Directory ACL */
 294         __u32   i_faddr;        /* Fragment address */
 295         union {
 296                 struct {
 297                         __u8    l_i_frag;       /* Fragment number */
 298                         __u8    l_i_fsize;      /* Fragment size */
 299                         __u16   i_pad1;
 300                         __u16   l_i_uid_high;   /* these 2 fields    */
 301                         __u16   l_i_gid_high;   /* were reserved2[0] */
 302                         __u32   l_i_reserved2;
 303                 } linux2;
 304                 struct {
 305                         __u8    h_i_frag;       /* Fragment number */
 306                         __u8    h_i_fsize;      /* Fragment size */
 307                         __u16   h_i_mode_high;
 308                         __u16   h_i_uid_high;
 309                         __u16   h_i_gid_high;
 310                         __u32   h_i_author;
 311                 } hurd2;
 312                 struct {
 313                         __u8    m_i_frag;       /* Fragment number */
 314                         __u8    m_i_fsize;      /* Fragment size */
 315                         __u16   m_pad1;
 316                         __u32   m_i_reserved2[2];
 317                 } masix2;
 318         } osd2;                         /* OS dependent 2 */
 319         __u16   i_extra_isize;
 320         __u16   i_pad1;
 321 };
 322
 323 #define i_size_high     i_dir_acl
 324
 325 /*
 326  * File system states
 327  */
 328 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 329 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 330
 331 /*
 332  * Mount flags
 333  */
 334 #define EXT2_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 335 #define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 336 #define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 337 #define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 338 #define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 339 #define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 340 #define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 341 #define EXT2_MOUNT_NO_UID32             0x0200  /* Disable 32-bit UIDs */
 342
 343 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 344 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 345 #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 346                                          EXT2_MOUNT_##opt)
 347 /*
 348  * Maximal mount counts between two filesystem checks
 349  */
 350 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 351 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 352
 353 /*
 354  * Behaviour when detecting errors
 355  */
 356 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 357 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 358 #define EXT2_ERRORS_PANIC               3       /* Panic */
 359 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 360
 361 /*
 362  * Structure of the super block
 363  */
 364 struct ext2_super_block {
 365         __u32   s_inodes_count;         /* Inodes count */
 366         __u32   s_blocks_count;         /* Blocks count */
 367         __u32   s_r_blocks_count;       /* Reserved blocks count */
 368         __u32   s_free_blocks_count;    /* Free blocks count */
 369         __u32   s_free_inodes_count;    /* Free inodes count */
 370         __u32   s_first_data_block;     /* First Data Block */
 371         __u32   s_log_block_size;       /* Block size */
 372         __s32   s_log_frag_size;        /* Fragment size */
 373         __u32   s_blocks_per_group;     /* # Blocks per group */
 374         __u32   s_frags_per_group;      /* # Fragments per group */
 375         __u32   s_inodes_per_group;     /* # Inodes per group */
 376         __u32   s_mtime;                /* Mount time */
 377         __u32   s_wtime;                /* Write time */
 378         __u16   s_mnt_count;            /* Mount count */
 379         __s16   s_max_mnt_count;        /* Maximal mount count */
 380         __u16   s_magic;                /* Magic signature */
 381         __u16   s_state;                /* File system state */
 382         __u16   s_errors;               /* Behaviour when detecting errors */
 383         __u16   s_minor_rev_level;      /* minor revision level */
 384         __u32   s_lastcheck;            /* time of last check */
 385         __u32   s_checkinterval;        /* max. time between checks */
 386         __u32   s_creator_os;           /* OS */
 387         __u32   s_rev_level;            /* Revision level */
 388         __u16   s_def_resuid;           /* Default uid for reserved blocks */
 389         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 390         /*
 391          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 392          *
 393          * Note: the difference between the compatible feature set and
 394          * the incompatible feature set is that if there is a bit set
 395          * in the incompatible feature set that the kernel doesn't
 396          * know about, it should refuse to mount the filesystem.
 397          *
 398          * e2fsck's requirements are more strict; if it doesn't know
 399          * about a feature in either the compatible or incompatible
 400          * feature set, it must abort and not try to meddle with
 401          * things it doesn't understand...
 402          */
 403         __u32   s_first_ino;            /* First non-reserved inode */
 404         __u16   s_inode_size;           /* size of inode structure */
 405         __u16   s_block_group_nr;       /* block group # of this superblock */
 406         __u32   s_feature_compat;       /* compatible feature set */
 407         __u32   s_feature_incompat;     /* incompatible feature set */
 408         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 409         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 410         char    s_volume_name[16];      /* volume name */
 411         char    s_last_mounted[64];     /* directory where last mounted */
 412         __u32   s_algorithm_usage_bitmap; /* For compression */
 413         /*
 414          * Performance hints.  Directory preallocation should only
 415          * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 416          */
 417         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 418         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 419         __u16   s_reserved_gdt_blocks;  /* Per group table for online growth */
 420         /*
 421          * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
 422          */
 423         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 424         __u32   s_journal_inum;         /* inode number of journal file */
 425         __u32   s_journal_dev;          /* device number of journal file */
 426         __u32   s_last_orphan;          /* start of list of inodes to delete */
 427         __u32   s_hash_seed[4];         /* HTREE hash seed */
 428         __u8    s_def_hash_version;     /* Default hash version to use */
 429         __u8    s_jnl_backup_type;      /* Default type of journal backup */
 430         __u16   s_reserved_word_pad;
 431         __u32   s_default_mount_opts;
 432         __u32   s_first_meta_bg;        /* First metablock group */
 433         __u32   s_mkfs_time;            /* When the filesystem was created */
 434         __u32   s_jnl_blocks[17];       /* Backup of the journal inode */
 435         __u32   s_reserved[172];        /* Padding to the end of the block */
 436 };
 437
 438 /*
 439  * Codes for operating systems
 440  */
 441 #define EXT2_OS_LINUX           0
 442 #define EXT2_OS_HURD            1
 443 #define EXT2_OS_MASIX           2
 444 #define EXT2_OS_FREEBSD         3
 445 #define EXT2_OS_LITES           4
 446
 447 /*
 448  * Revision levels
 449  */
 450 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 451 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 452
 453 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 454 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 455
 456 #define EXT2_GOOD_OLD_INODE_SIZE 128
 457
 458 /*
 459  * Journal inode backup types
 460  */
 461 #define EXT3_JNL_BACKUP_BLOCKS  1
 462
 463 /*
 464  * Feature set definitions
 465  */
 466
 467 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 468         ( EXT2_SB(sb)->s_feature_compat & (mask) )
 469 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 470         ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
 471 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 472         ( EXT2_SB(sb)->s_feature_incompat & (mask) )
 473
 474 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 475 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 476 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 477 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 478 #define EXT2_FEATURE_COMPAT_RESIZE_INODE        0x0010
 479 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 480
 481 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 482 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 483 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR     0x0004 not used */
 484
 485 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 486 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 487 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 488 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 489 #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 490 #define EXT3_FEATURE_INCOMPAT_EXTENTS           0x0040
 491
 492
 493 #define EXT2_FEATURE_COMPAT_SUPP        0
 494 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE)
 495 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 496                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 497                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 498
 499 /*
 500  * Default values for user and/or group using reserved blocks
 501  */
 502 #define EXT2_DEF_RESUID         0
 503 #define EXT2_DEF_RESGID         0
 504
 505 /*
 506  * Default mount options
 507  */
 508 #define EXT2_DEFM_DEBUG         0x0001
 509 #define EXT2_DEFM_BSDGROUPS     0x0002
 510 #define EXT2_DEFM_XATTR_USER    0x0004
 511 #define EXT2_DEFM_ACL           0x0008
 512 #define EXT2_DEFM_UID16         0x0010
 513 #define EXT3_DEFM_JMODE         0x0060
 514 #define EXT3_DEFM_JMODE_DATA    0x0020
 515 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 516 #define EXT3_DEFM_JMODE_WBACK   0x0060
 517
 518 /*
 519  * Structure of a directory entry
 520  */
 521 #define EXT2_NAME_LEN 255
 522
 523 struct ext2_dir_entry {
 524         __u32   inode;                  /* Inode number */
 525         __u16   rec_len;                /* Directory entry length */
 526         __u16   name_len;               /* Name length */
 527         char    name[EXT2_NAME_LEN];    /* File name */
 528 };
 529
 530 /*
 531  * The new version of the directory entry.  Since EXT2 structures are
 532  * stored in intel byte order, and the name_len field could never be
 533  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 534  * file_type field.
 535  */
 536 struct ext2_dir_entry_2 {
 537         __u32   inode;                  /* Inode number */
 538         __u16   rec_len;                /* Directory entry length */
 539         __u8    name_len;               /* Name length */
 540         __u8    file_type;
 541         char    name[EXT2_NAME_LEN];    /* File name */
 542 };
 543
 544 /*
 545  * Ext2 directory file types.  Only the low 3 bits are used.  The
 546  * other bits are reserved for now.
 547  */
 548 #define EXT2_FT_UNKNOWN         0
 549 #define EXT2_FT_REG_FILE        1
 550 #define EXT2_FT_DIR             2
 551 #define EXT2_FT_CHRDEV          3
 552 #define EXT2_FT_BLKDEV          4
 553 #define EXT2_FT_FIFO            5
 554 #define EXT2_FT_SOCK            6
 555 #define EXT2_FT_SYMLINK         7
 556
 557 #define EXT2_FT_MAX             8
 558
 559 /*
 560  * EXT2_DIR_PAD defines the directory entries boundaries
 561  *
 562  * NOTE: It must be a multiple of 4
 563  */
 564 #define EXT2_DIR_PAD                    4
 565 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 566 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 567                                          ~EXT2_DIR_ROUND)
 568
 569 #endif