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
  17#ifndef _LINUX_EXT2_FS_H
  18#define _LINUX_EXT2_FS_H
  19
  20#include "ext2_types.h"         /* Changed from linux/types.h */
  21
  22/*
  23 * Special inode numbers
  24 */
  25#define EXT2_BAD_INO             1      /* Bad blocks inode */
  26#define EXT2_ROOT_INO            2      /* Root inode */
  27#define EXT2_ACL_IDX_INO         3      /* ACL inode */
  28#define EXT2_ACL_DATA_INO        4      /* ACL inode */
  29#define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  30#define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  31#define EXT2_RESIZE_INO          7      /* Reserved group descriptors inode */
  32#define EXT2_JOURNAL_INO         8      /* Journal inode */
  33
  34/* First non-reserved inode for old ext2 filesystems */
  35#define EXT2_GOOD_OLD_FIRST_INO 11
  36
  37/*
  38 * The second extended file system magic number
  39 */
  40#define EXT2_SUPER_MAGIC        0xEF53
  41
  42/* Assume that user mode programs are passing in an ext2fs superblock, not
  43 * a kernel struct super_block.  This will allow us to call the feature-test
  44 * macros from user land. */
  45#define EXT2_SB(sb)     (sb)
  46
  47/*
  48 * Maximal count of links to a file
  49 */
  50#define EXT2_LINK_MAX           32000
  51
  52/*
  53 * Macro-instructions used to manage several block sizes
  54 */
  55#define EXT2_MIN_BLOCK_LOG_SIZE         10      /* 1024 */
  56#define EXT2_MAX_BLOCK_LOG_SIZE         16      /* 65536 */
  57#define EXT2_MIN_BLOCK_SIZE     (1 << EXT2_MIN_BLOCK_LOG_SIZE)
  58#define EXT2_MAX_BLOCK_SIZE     (1 << EXT2_MAX_BLOCK_LOG_SIZE)
  59#define EXT2_BLOCK_SIZE(s)      (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  60#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
  61#define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  62                                 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
  63#define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  64                                 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
  65#define EXT2_ADDR_PER_BLOCK(s)  (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
  66
  67/*
  68 * Macro-instructions used to manage fragments
  69 */
  70#define EXT2_MIN_FRAG_SIZE              EXT2_MIN_BLOCK_SIZE
  71#define EXT2_MAX_FRAG_SIZE              EXT2_MAX_BLOCK_SIZE
  72#define EXT2_MIN_FRAG_LOG_SIZE          EXT2_MIN_BLOCK_LOG_SIZE
  73# define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
  74# define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
  75
  76/*
  77 * ACL structures
  78 */
  79struct ext2_acl_header  /* Header of Access Control Lists */
  80{
  81        __u32   aclh_size;
  82        __u32   aclh_file_count;
  83        __u32   aclh_acle_count;
  84        __u32   aclh_first_acle;
  85};
  86
  87struct ext2_acl_entry   /* Access Control List Entry */
  88{
  89        __u32   acle_size;
  90        __u16   acle_perms;     /* Access permissions */
  91        __u16   acle_type;      /* Type of entry */
  92        __u16   acle_tag;       /* User or group identity */
  93        __u16   acle_pad1;
  94        __u32   acle_next;      /* Pointer on next entry for the */
  95                                        /* same inode or on next free entry */
  96};
  97
  98/*
  99 * Structure of a blocks group descriptor
 100 */
 101struct ext2_group_desc
 102{
 103        __u32   bg_block_bitmap;                /* Blocks bitmap block */
 104        __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 105        __u32   bg_inode_table;         /* Inodes table block */
 106        __u16   bg_free_blocks_count;   /* Free blocks count */
 107        __u16   bg_free_inodes_count;   /* Free inodes count */
 108        __u16   bg_used_dirs_count;     /* Directories count */
 109        __u16   bg_pad;
 110        __u32   bg_reserved[3];
 111};
 112
 113/*
 114 * Data structures used by the directory indexing feature
 115 *
 116 * Note: all of the multibyte integer fields are little endian.
 117 */
 118
 119/*
 120 * Note: dx_root_info is laid out so that if it should somehow get
 121 * overlaid by a dirent the two low bits of the hash version will be
 122 * zero.  Therefore, the hash version mod 4 should never be 0.
 123 * Sincerely, the paranoia department.
 124 */
 125struct ext2_dx_root_info {
 126        __u32 reserved_zero;
 127        __u8 hash_version; /* 0 now, 1 at release */
 128        __u8 info_length; /* 8 */
 129        __u8 indirect_levels;
 130        __u8 unused_flags;
 131};
 132
 133#define EXT2_HASH_LEGACY        0
 134#define EXT2_HASH_HALF_MD4      1
 135#define EXT2_HASH_TEA           2
 136
 137#define EXT2_HASH_FLAG_INCOMPAT 0x1
 138
 139struct ext2_dx_entry {
 140        __u32 hash;
 141        __u32 block;
 142};
 143
 144struct ext2_dx_countlimit {
 145        __u16 limit;
 146        __u16 count;
 147};
 148
 149
 150/*
 151 * Macro-instructions used to manage group descriptors
 152 */
 153#define EXT2_BLOCKS_PER_GROUP(s)        (EXT2_SB(s)->s_blocks_per_group)
 154#define EXT2_INODES_PER_GROUP(s)        (EXT2_SB(s)->s_inodes_per_group)
 155#define EXT2_INODES_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
 156/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
 157#define EXT2_MAX_BLOCKS_PER_GROUP(s)    ((1 << 16) - 8)
 158#define EXT2_MAX_INODES_PER_GROUP(s)    ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
 159#define EXT2_DESC_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 160
 161/*
 162 * Constants relative to the data blocks
 163 */
 164#define EXT2_NDIR_BLOCKS                12
 165#define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 166#define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 167#define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 168#define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 169
 170/*
 171 * Inode flags
 172 */
 173#define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 174#define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 175#define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 176#define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 177#define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 178#define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 179#define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 180#define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 181/* Reserved for compression usage... */
 182#define EXT2_DIRTY_FL                   0x00000100
 183#define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 184#define EXT2_NOCOMPR_FL                 0x00000400 /* Access raw compressed data */
 185#define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 186/* End compression flags --- maybe not all used */
 187#define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 188#define EXT2_INDEX_FL                   0x00001000 /* hash-indexed directory */
 189#define EXT2_IMAGIC_FL                  0x00002000
 190#define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 191#define EXT2_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 192#define EXT2_DIRSYNC_FL                 0x00010000 /* Synchronous directory modifications */
 193#define EXT2_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 194#define EXT3_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 195#define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 196
 197#define EXT2_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 198#define EXT2_FL_USER_MODIFIABLE         0x000080FF /* User modifiable flags */
 199
 200/*
 201 * ioctl commands
 202 */
 203#define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 204#define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 205#define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 206#define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 207
 208/*
 209 * Structure of an inode on the disk
 210 */
 211struct ext2_inode {
 212        __u16   i_mode;         /* File mode */
 213        __u16   i_uid;          /* Low 16 bits of Owner Uid */
 214        __u32   i_size;         /* Size in bytes */
 215        __u32   i_atime;        /* Access time */
 216        __u32   i_ctime;        /* Creation time */
 217        __u32   i_mtime;        /* Modification time */
 218        __u32   i_dtime;        /* Deletion Time */
 219        __u16   i_gid;          /* Low 16 bits of Group Id */
 220        __u16   i_links_count;  /* Links count */
 221        __u32   i_blocks;       /* Blocks count */
 222        __u32   i_flags;        /* File flags */
 223        union {
 224                struct {
 225                        __u32  l_i_reserved1;
 226                } linux1;
 227                struct {
 228                        __u32  h_i_translator;
 229                } hurd1;
 230                struct {
 231                        __u32  m_i_reserved1;
 232                } masix1;
 233        } osd1;                         /* OS dependent 1 */
 234        __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 235        __u32   i_generation;   /* File version (for NFS) */
 236        __u32   i_file_acl;     /* File ACL */
 237        __u32   i_dir_acl;      /* Directory ACL */
 238        __u32   i_faddr;        /* Fragment address */
 239        union {
 240                struct {
 241                        __u8    l_i_frag;       /* Fragment number */
 242                        __u8    l_i_fsize;      /* Fragment size */
 243                        __u16   i_pad1;
 244                        __u16   l_i_uid_high;   /* these 2 fields    */
 245                        __u16   l_i_gid_high;   /* were reserved2[0] */
 246                        __u32   l_i_reserved2;
 247                } linux2;
 248                struct {
 249                        __u8    h_i_frag;       /* Fragment number */
 250                        __u8    h_i_fsize;      /* Fragment size */
 251                        __u16   h_i_mode_high;
 252                        __u16   h_i_uid_high;
 253                        __u16   h_i_gid_high;
 254                        __u32   h_i_author;
 255                } hurd2;
 256                struct {
 257                        __u8    m_i_frag;       /* Fragment number */
 258                        __u8    m_i_fsize;      /* Fragment size */
 259                        __u16   m_pad1;
 260                        __u32   m_i_reserved2[2];
 261                } masix2;
 262        } osd2;                         /* OS dependent 2 */
 263};
 264
 265/*
 266 * Permanent part of an large inode on the disk
 267 */
 268struct ext2_inode_large {
 269        __u16   i_mode;         /* File mode */
 270        __u16   i_uid;          /* Low 16 bits of Owner Uid */
 271        __u32   i_size;         /* Size in bytes */
 272        __u32   i_atime;        /* Access time */
 273        __u32   i_ctime;        /* Creation time */
 274        __u32   i_mtime;        /* Modification time */
 275        __u32   i_dtime;        /* Deletion Time */
 276        __u16   i_gid;          /* Low 16 bits of Group Id */
 277        __u16   i_links_count;  /* Links count */
 278        __u32   i_blocks;       /* Blocks count */
 279        __u32   i_flags;        /* File flags */
 280        union {
 281                struct {
 282                        __u32  l_i_reserved1;
 283                } linux1;
 284                struct {
 285                        __u32  h_i_translator;
 286                } hurd1;
 287                struct {
 288                        __u32  m_i_reserved1;
 289                } masix1;
 290        } osd1;                         /* OS dependent 1 */
 291        __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 292        __u32   i_generation;   /* File version (for NFS) */
 293        __u32   i_file_acl;     /* File ACL */
 294        __u32   i_dir_acl;      /* Directory ACL */
 295        __u32   i_faddr;        /* Fragment address */
 296        union {
 297                struct {
 298                        __u8    l_i_frag;       /* Fragment number */
 299                        __u8    l_i_fsize;      /* Fragment size */
 300                        __u16   i_pad1;
 301                        __u16   l_i_uid_high;   /* these 2 fields    */
 302                        __u16   l_i_gid_high;   /* were reserved2[0] */
 303                        __u32   l_i_reserved2;
 304                } linux2;
 305                struct {
 306                        __u8    h_i_frag;       /* Fragment number */
 307                        __u8    h_i_fsize;      /* Fragment size */
 308                        __u16   h_i_mode_high;
 309                        __u16   h_i_uid_high;
 310                        __u16   h_i_gid_high;
 311                        __u32   h_i_author;
 312                } hurd2;
 313                struct {
 314                        __u8    m_i_frag;       /* Fragment number */
 315                        __u8    m_i_fsize;      /* Fragment size */
 316                        __u16   m_pad1;
 317                        __u32   m_i_reserved2[2];
 318                } masix2;
 319        } osd2;                         /* OS dependent 2 */
 320        __u16   i_extra_isize;
 321        __u16   i_pad1;
 322};
 323
 324#define i_size_high     i_dir_acl
 325
 326/*
 327 * File system states
 328 */
 329#define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 330#define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 331
 332/*
 333 * Mount flags
 334 */
 335#define EXT2_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 336#define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 337#define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 338#define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 339#define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 340#define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 341#define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 342#define EXT2_MOUNT_NO_UID32             0x0200  /* Disable 32-bit UIDs */
 343
 344#define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 345#define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 346#define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 347                                         EXT2_MOUNT_##opt)
 348/*
 349 * Maximal mount counts between two filesystem checks
 350 */
 351#define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 352#define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 353
 354/*
 355 * Behaviour when detecting errors
 356 */
 357#define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 358#define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 359#define EXT2_ERRORS_PANIC               3       /* Panic */
 360#define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 361
 362/*
 363 * Structure of the super block
 364 */
 365struct ext2_super_block {
 366        __u32   s_inodes_count;         /* Inodes count */
 367        __u32   s_blocks_count;         /* Blocks count */
 368        __u32   s_r_blocks_count;       /* Reserved blocks count */
 369        __u32   s_free_blocks_count;    /* Free blocks count */
 370        __u32   s_free_inodes_count;    /* Free inodes count */
 371        __u32   s_first_data_block;     /* First Data Block */
 372        __u32   s_log_block_size;       /* Block size */
 373        __s32   s_log_frag_size;        /* Fragment size */
 374        __u32   s_blocks_per_group;     /* # Blocks per group */
 375        __u32   s_frags_per_group;      /* # Fragments per group */
 376        __u32   s_inodes_per_group;     /* # Inodes per group */
 377        __u32   s_mtime;                /* Mount time */
 378        __u32   s_wtime;                /* Write time */
 379        __u16   s_mnt_count;            /* Mount count */
 380        __s16   s_max_mnt_count;        /* Maximal mount count */
 381        __u16   s_magic;                /* Magic signature */
 382        __u16   s_state;                /* File system state */
 383        __u16   s_errors;               /* Behaviour when detecting errors */
 384        __u16   s_minor_rev_level;      /* minor revision level */
 385        __u32   s_lastcheck;            /* time of last check */
 386        __u32   s_checkinterval;        /* max. time between checks */
 387        __u32   s_creator_os;           /* OS */
 388        __u32   s_rev_level;            /* Revision level */
 389        __u16   s_def_resuid;           /* Default uid for reserved blocks */
 390        __u16   s_def_resgid;           /* Default gid for reserved blocks */
 391        /*
 392         * These fields are for EXT2_DYNAMIC_REV superblocks only.
 393         *
 394         * Note: the difference between the compatible feature set and
 395         * the incompatible feature set is that if there is a bit set
 396         * in the incompatible feature set that the kernel doesn't
 397         * know about, it should refuse to mount the filesystem.
 398         *
 399         * e2fsck's requirements are more strict; if it doesn't know
 400         * about a feature in either the compatible or incompatible
 401         * feature set, it must abort and not try to meddle with
 402         * things it doesn't understand...
 403         */
 404        __u32   s_first_ino;            /* First non-reserved inode */
 405        __u16   s_inode_size;           /* size of inode structure */
 406        __u16   s_block_group_nr;       /* block group # of this superblock */
 407        __u32   s_feature_compat;       /* compatible feature set */
 408        __u32   s_feature_incompat;     /* incompatible feature set */
 409        __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 410        __u8    s_uuid[16];             /* 128-bit uuid for volume */
 411        char    s_volume_name[16];      /* volume name */
 412        char    s_last_mounted[64];     /* directory where last mounted */
 413        __u32   s_algorithm_usage_bitmap; /* For compression */
 414        /*
 415         * Performance hints.  Directory preallocation should only
 416         * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 417         */
 418        __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 419        __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 420        __u16   s_reserved_gdt_blocks;  /* Per group table for online growth */
 421        /*
 422         * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
 423         */
 424        __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 425        __u32   s_journal_inum;         /* inode number of journal file */
 426        __u32   s_journal_dev;          /* device number of journal file */
 427        __u32   s_last_orphan;          /* start of list of inodes to delete */
 428        __u32   s_hash_seed[4];         /* HTREE hash seed */
 429        __u8    s_def_hash_version;     /* Default hash version to use */
 430        __u8    s_jnl_backup_type;      /* Default type of journal backup */
 431        __u16   s_reserved_word_pad;
 432        __u32   s_default_mount_opts;
 433        __u32   s_first_meta_bg;        /* First metablock group */
 434        __u32   s_mkfs_time;            /* When the filesystem was created */
 435        __u32   s_jnl_blocks[17];       /* Backup of the journal inode */
 436        __u32   s_reserved[172];        /* Padding to the end of the block */
 437};
 438
 439/*
 440 * Codes for operating systems
 441 */
 442#define EXT2_OS_LINUX           0
 443#define EXT2_OS_HURD            1
 444#define EXT2_OS_MASIX           2
 445#define EXT2_OS_FREEBSD         3
 446#define EXT2_OS_LITES           4
 447
 448/*
 449 * Revision levels
 450 */
 451#define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 452#define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 453
 454#define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 455#define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 456
 457#define EXT2_GOOD_OLD_INODE_SIZE 128
 458
 459/*
 460 * Journal inode backup types
 461 */
 462#define EXT3_JNL_BACKUP_BLOCKS  1
 463
 464/*
 465 * Feature set definitions
 466 */
 467
 468#define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 469        ( EXT2_SB(sb)->s_feature_compat & (mask) )
 470#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 471        ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
 472#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 473        ( EXT2_SB(sb)->s_feature_incompat & (mask) )
 474
 475#define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 476#define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 477#define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 478#define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 479#define EXT2_FEATURE_COMPAT_RESIZE_INODE        0x0010
 480#define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 481
 482#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 483#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 484/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR     0x0004 not used */
 485
 486#define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 487#define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 488#define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 489#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 490#define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 491#define EXT3_FEATURE_INCOMPAT_EXTENTS           0x0040
 492
 493
 494#define EXT2_FEATURE_COMPAT_SUPP        0
 495#define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE)
 496#define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 497                                         EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 498                                         EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 499
 500/*
 501 * Default values for user and/or group using reserved blocks
 502 */
 503#define EXT2_DEF_RESUID         0
 504#define EXT2_DEF_RESGID         0
 505
 506/*
 507 * Default mount options
 508 */
 509#define EXT2_DEFM_DEBUG         0x0001
 510#define EXT2_DEFM_BSDGROUPS     0x0002
 511#define EXT2_DEFM_XATTR_USER    0x0004
 512#define EXT2_DEFM_ACL           0x0008
 513#define EXT2_DEFM_UID16         0x0010
 514#define EXT3_DEFM_JMODE         0x0060
 515#define EXT3_DEFM_JMODE_DATA    0x0020
 516#define EXT3_DEFM_JMODE_ORDERED 0x0040
 517#define EXT3_DEFM_JMODE_WBACK   0x0060
 518
 519/*
 520 * Structure of a directory entry
 521 */
 522#define EXT2_NAME_LEN 255
 523
 524struct ext2_dir_entry {
 525        __u32   inode;                  /* Inode number */
 526        __u16   rec_len;                /* Directory entry length */
 527        __u16   name_len;               /* Name length */
 528        char    name[EXT2_NAME_LEN];    /* File name */
 529};
 530
 531/*
 532 * The new version of the directory entry.  Since EXT2 structures are
 533 * stored in intel byte order, and the name_len field could never be
 534 * bigger than 255 chars, it's safe to reclaim the extra byte for the
 535 * file_type field.
 536 */
 537struct ext2_dir_entry_2 {
 538        __u32   inode;                  /* Inode number */
 539        __u16   rec_len;                /* Directory entry length */
 540        __u8    name_len;               /* Name length */
 541        __u8    file_type;
 542        char    name[EXT2_NAME_LEN];    /* File name */
 543};
 544
 545/*
 546 * Ext2 directory file types.  Only the low 3 bits are used.  The
 547 * other bits are reserved for now.
 548 */
 549#define EXT2_FT_UNKNOWN         0
 550#define EXT2_FT_REG_FILE        1
 551#define EXT2_FT_DIR             2
 552#define EXT2_FT_CHRDEV          3
 553#define EXT2_FT_BLKDEV          4
 554#define EXT2_FT_FIFO            5
 555#define EXT2_FT_SOCK            6
 556#define EXT2_FT_SYMLINK         7
 557
 558#define EXT2_FT_MAX             8
 559
 560/*
 561 * EXT2_DIR_PAD defines the directory entries boundaries
 562 *
 563 * NOTE: It must be a multiple of 4
 564 */
 565#define EXT2_DIR_PAD                    4
 566#define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 567#define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 568                                         ~EXT2_DIR_ROUND)
 569
 570#endif  /* _LINUX_EXT2_FS_H */
 571