LXR linux/include/linux/ext2

   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
  21/*
  22 * The second extended filesystem constants/structures
  23 */
  24
  25/*
  26 * Define EXT2FS_DEBUG to produce debug messages
  27 */
  28#undef EXT2FS_DEBUG
  29
  30/*
  31 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
  32 */
  33#define EXT2_PREALLOCATE
  34#define EXT2_DEFAULT_PREALLOC_BLOCKS    8
  35
  36/*
  37 * The second extended file system version
  38 */
  39#define EXT2FS_DATE             "95/08/09"
  40#define EXT2FS_VERSION          "0.5b"
  41
  42/*
  43 * Debug code
  44 */
  45#ifdef EXT2FS_DEBUG
  46#       define ext2_debug(f, a...)      { \
  47                                        printk ("EXT2-fs DEBUG (%s, %d): %s:", \
  48                                                __FILE__, __LINE__, __FUNCTION__); \
  49                                        printk (f, ## a); \
  50                                        }
  51#else
  52#       define ext2_debug(f, a...)      /**/
  53#endif
  54
  55/*
  56 * Special inode numbers
  57 */
  58#define EXT2_BAD_INO             1      /* Bad blocks inode */
  59#define EXT2_ROOT_INO            2      /* Root inode */
  60#define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  61#define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  62
  63/* First non-reserved inode for old ext2 filesystems */
  64#define EXT2_GOOD_OLD_FIRST_INO 11
  65
  66/*
  67 * The second extended file system magic number
  68 */
  69#define EXT2_SUPER_MAGIC        0xEF53
  70
  71#ifdef __KERNEL__
  72#include <linux/ext2_fs_sb.h>
  73static 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 */
 136struct ext2_group_desc
 137{
 138        __le32  bg_block_bitmap;                /* Blocks bitmap block */
 139        __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 140        __le32  bg_inode_table;         /* Inodes table block */
 141        __le16  bg_free_blocks_count;   /* Free blocks count */
 142        __le16  bg_free_inodes_count;   /* Free inodes count */
 143        __le16  bg_used_dirs_count;     /* Directories count */
 144        __le16  bg_pad;
 145        __le32  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_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 196
 197#define EXT2_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 198#define EXT2_FL_USER_MODIFIABLE         0x000380FF /* 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        __le16  i_mode;         /* File mode */
 213        __le16  i_uid;          /* Low 16 bits of Owner Uid */
 214        __le32  i_size;         /* Size in bytes */
 215        __le32  i_atime;        /* Access time */
 216        __le32  i_ctime;        /* Creation time */
 217        __le32  i_mtime;        /* Modification time */
 218        __le32  i_dtime;        /* Deletion Time */
 219        __le16  i_gid;          /* Low 16 bits of Group Id */
 220        __le16  i_links_count;  /* Links count */
 221        __le32  i_blocks;       /* Blocks count */
 222        __le32  i_flags;        /* File flags */
 223        union {
 224                struct {
 225                        __le32  l_i_reserved1;
 226                } linux1;
 227                struct {
 228                        __le32  h_i_translator;
 229                } hurd1;
 230                struct {
 231                        __le32  m_i_reserved1;
 232                } masix1;
 233        } osd1;                         /* OS dependent 1 */
 234        __le32  i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 235        __le32  i_generation;   /* File version (for NFS) */
 236        __le32  i_file_acl;     /* File ACL */
 237        __le32  i_dir_acl;      /* Directory ACL */
 238        __le32  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                        __le16  l_i_uid_high;   /* these 2 fields    */
 245                        __le16  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                        __le16  h_i_mode_high;
 252                        __le16  h_i_uid_high;
 253                        __le16  h_i_gid_high;
 254                        __le32  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#define i_size_high     i_dir_acl
 266
 267#if defined(__KERNEL__) || defined(__linux__)
 268#define i_reserved1     osd1.linux1.l_i_reserved1
 269#define i_frag          osd2.linux2.l_i_frag
 270#define i_fsize         osd2.linux2.l_i_fsize
 271#define i_uid_low       i_uid
 272#define i_gid_low       i_gid
 273#define i_uid_high      osd2.linux2.l_i_uid_high
 274#define i_gid_high      osd2.linux2.l_i_gid_high
 275#define i_reserved2     osd2.linux2.l_i_reserved2
 276#endif
 277
 278#ifdef  __hurd__
 279#define i_translator    osd1.hurd1.h_i_translator
 280#define i_frag          osd2.hurd2.h_i_frag;
 281#define i_fsize         osd2.hurd2.h_i_fsize;
 282#define i_uid_high      osd2.hurd2.h_i_uid_high
 283#define i_gid_high      osd2.hurd2.h_i_gid_high
 284#define i_author        osd2.hurd2.h_i_author
 285#endif
 286
 287#ifdef  __masix__
 288#define i_reserved1     osd1.masix1.m_i_reserved1
 289#define i_frag          osd2.masix2.m_i_frag
 290#define i_fsize         osd2.masix2.m_i_fsize
 291#define i_reserved2     osd2.masix2.m_i_reserved2
 292#endif
 293
 294/*
 295 * File system states
 296 */
 297#define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 298#define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 299
 300/*
 301 * Mount flags
 302 */
 303#define EXT2_MOUNT_CHECK                0x000001  /* Do mount-time checks */
 304#define EXT2_MOUNT_OLDALLOC             0x000002  /* Don't use the new Orlov allocator */
 305#define EXT2_MOUNT_GRPID                0x000004  /* Create files with directory's group */
 306#define EXT2_MOUNT_DEBUG                0x000008  /* Some debugging messages */
 307#define EXT2_MOUNT_ERRORS_CONT          0x000010  /* Continue on errors */
 308#define EXT2_MOUNT_ERRORS_RO            0x000020  /* Remount fs ro on errors */
 309#define EXT2_MOUNT_ERRORS_PANIC         0x000040  /* Panic on errors */
 310#define EXT2_MOUNT_MINIX_DF             0x000080  /* Mimics the Minix statfs */
 311#define EXT2_MOUNT_NOBH                 0x000100  /* No buffer_heads */
 312#define EXT2_MOUNT_NO_UID32             0x000200  /* Disable 32-bit UIDs */
 313#define EXT2_MOUNT_XATTR_USER           0x004000  /* Extended user attributes */
 314#define EXT2_MOUNT_POSIX_ACL            0x008000  /* POSIX Access Control Lists */
 315#define EXT2_MOUNT_XIP                  0x010000  /* Execute in place */
 316#define EXT2_MOUNT_USRQUOTA             0x020000 /* user quota */
 317#define EXT2_MOUNT_GRPQUOTA             0x040000 /* group quota */
 318
 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 */
 341struct ext2_super_block {
 342        __le32  s_inodes_count;         /* Inodes count */
 343        __le32  s_blocks_count;         /* Blocks count */
 344        __le32  s_r_blocks_count;       /* Reserved blocks count */
 345        __le32  s_free_blocks_count;    /* Free blocks count */
 346        __le32  s_free_inodes_count;    /* Free inodes count */
 347        __le32  s_first_data_block;     /* First Data Block */
 348        __le32  s_log_block_size;       /* Block size */
 349        __le32  s_log_frag_size;        /* Fragment size */
 350        __le32  s_blocks_per_group;     /* # Blocks per group */
 351        __le32  s_frags_per_group;      /* # Fragments per group */
 352        __le32  s_inodes_per_group;     /* # Inodes per group */
 353        __le32  s_mtime;                /* Mount time */
 354        __le32  s_wtime;                /* Write time */
 355        __le16  s_mnt_count;            /* Mount count */
 356        __le16  s_max_mnt_count;        /* Maximal mount count */
 357        __le16  s_magic;                /* Magic signature */
 358        __le16  s_state;                /* File system state */
 359        __le16  s_errors;               /* Behaviour when detecting errors */
 360        __le16  s_minor_rev_level;      /* minor revision level */
 361        __le32  s_lastcheck;            /* time of last check */
 362        __le32  s_checkinterval;        /* max. time between checks */
 363        __le32  s_creator_os;           /* OS */
 364        __le32  s_rev_level;            /* Revision level */
 365        __le16  s_def_resuid;           /* Default uid for reserved blocks */
 366        __le16  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        __le32  s_first_ino;            /* First non-reserved inode */
 381        __le16   s_inode_size;          /* size of inode structure */
 382        __le16  s_block_group_nr;       /* block group # of this superblock */
 383        __le32  s_feature_compat;       /* compatible feature set */
 384        __le32  s_feature_incompat;     /* incompatible feature set */
 385        __le32  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        __le32  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        __le32  s_default_mount_opts;
 409        __le32  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
 510struct ext2_dir_entry {
 511        __le32  inode;                  /* Inode number */
 512        __le16  rec_len;                /* Directory entry length */
 513        __le16  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 */
 523struct ext2_dir_entry_2 {
 524        __le32  inode;                  /* Inode number */
 525        __le16  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 */
 535enum {
 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 */
 558