LXR busybox/e2fsprogs/old_e2fsprogs/ext2fs/ext2

   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 */
  78struct 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
  86struct 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 */
 100struct 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 */
 124struct 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
 138struct ext2_dx_entry {
 139        __u32 hash;
 140        __u32 block;
 141};
 142
 143struct 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 */
 210struct 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 */
 267struct 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 */
 364struct 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
 523struct 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 */
 536struct 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
 570