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#include <linux/magic.h>
  21
  22/*
  23 * The second extended filesystem constants/structures
  24 */
  25
  26/*
  27 * Define EXT2FS_DEBUG to produce debug messages
  28 */
  29#undef EXT2FS_DEBUG
  30
  31/*
  32 * Define EXT2_RESERVATION to reserve data blocks for expanding files
  33 */
  34#define EXT2_DEFAULT_RESERVE_BLOCKS     8
  35/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  36#define EXT2_MAX_RESERVE_BLOCKS         1027
  37#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
  38/*
  39 * The second extended file system version
  40 */
  41#define EXT2FS_DATE             "95/08/09"
  42#define EXT2FS_VERSION          "0.5b"
  43
  44/*
  45 * Debug code
  46 */
  47#ifdef EXT2FS_DEBUG
  48#       define ext2_debug(f, a...)      { \
  49                                        printk ("EXT2-fs DEBUG (%s, %d): %s:", \
  50                                                __FILE__, __LINE__, __FUNCTION__); \
  51                                        printk (f, ## a); \
  52                                        }
  53#else
  54#       define ext2_debug(f, a...)      /**/
  55#endif
  56
  57/*
  58 * Special inode numbers
  59 */
  60#define EXT2_BAD_INO             1      /* Bad blocks inode */
  61#define EXT2_ROOT_INO            2      /* Root inode */
  62#define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  63#define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  64
  65/* First non-reserved inode for old ext2 filesystems */
  66#define EXT2_GOOD_OLD_FIRST_INO 11
  67
  68#ifdef __KERNEL__
  69#include <linux/ext2_fs_sb.h>
  70static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
  71{
  72        return sb->s_fs_info;
  73}
  74#else
  75/* Assume that user mode programs are passing in an ext2fs superblock, not
  76 * a kernel struct super_block.  This will allow us to call the feature-test
  77 * macros from user land. */
  78#define EXT2_SB(sb)     (sb)
  79#endif
  80
  81/*
  82 * Maximal count of links to a file
  83 */
  84#define EXT2_LINK_MAX           32000
  85
  86/*
  87 * Macro-instructions used to manage several block sizes
  88 */
  89#define EXT2_MIN_BLOCK_SIZE             1024
  90#define EXT2_MAX_BLOCK_SIZE             4096
  91#define EXT2_MIN_BLOCK_LOG_SIZE           10
  92#ifdef __KERNEL__
  93# define EXT2_BLOCK_SIZE(s)             ((s)->s_blocksize)
  94#else
  95# define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  96#endif
  97#define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
  98#ifdef __KERNEL__
  99# define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 100#else
 101# define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 102#endif
 103#ifdef __KERNEL__
 104#define EXT2_ADDR_PER_BLOCK_BITS(s)     (EXT2_SB(s)->s_addr_per_block_bits)
 105#define EXT2_INODE_SIZE(s)              (EXT2_SB(s)->s_inode_size)
 106#define EXT2_FIRST_INO(s)               (EXT2_SB(s)->s_first_ino)
 107#else
 108#define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
 109                                 EXT2_GOOD_OLD_INODE_SIZE : \
 110                                 (s)->s_inode_size)
 111#define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
 112                                 EXT2_GOOD_OLD_FIRST_INO : \
 113                                 (s)->s_first_ino)
 114#endif
 115
 116/*
 117 * Macro-instructions used to manage fragments
 118 */
 119#define EXT2_MIN_FRAG_SIZE              1024
 120#define EXT2_MAX_FRAG_SIZE              4096
 121#define EXT2_MIN_FRAG_LOG_SIZE            10
 122#ifdef __KERNEL__
 123# define EXT2_FRAG_SIZE(s)              (EXT2_SB(s)->s_frag_size)
 124# define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_SB(s)->s_frags_per_block)
 125#else
 126# define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 127# define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 128#endif
 129
 130/*
 131 * Structure of a blocks group descriptor
 132 */
 133struct ext2_group_desc
 134{
 135        __le32  bg_block_bitmap;                /* Blocks bitmap block */
 136        __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 137        __le32  bg_inode_table;         /* Inodes table block */
 138        __le16  bg_free_blocks_count;   /* Free blocks count */
 139        __le16  bg_free_inodes_count;   /* Free inodes count */
 140        __le16  bg_used_dirs_count;     /* Directories count */
 141        __le16  bg_pad;
 142        __le32  bg_reserved[3];
 143};
 144
 145/*
 146 * Macro-instructions used to manage group descriptors
 147 */
 148#ifdef __KERNEL__
 149# define EXT2_BLOCKS_PER_GROUP(s)       (EXT2_SB(s)->s_blocks_per_group)
 150# define EXT2_DESC_PER_BLOCK(s)         (EXT2_SB(s)->s_desc_per_block)
 151# define EXT2_INODES_PER_GROUP(s)       (EXT2_SB(s)->s_inodes_per_group)
 152# define EXT2_DESC_PER_BLOCK_BITS(s)    (EXT2_SB(s)->s_desc_per_block_bits)
 153#else
 154# define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 155# define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 156# define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 157#endif
 158
 159/*
 160 * Constants relative to the data blocks
 161 */
 162#define EXT2_NDIR_BLOCKS                12
 163#define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 164#define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 165#define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 166#define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 167
 168/*
 169 * Inode flags (GETFLAGS/SETFLAGS)
 170 */
 171#define EXT2_SECRM_FL                   FS_SECRM_FL     /* Secure deletion */
 172#define EXT2_UNRM_FL                    FS_UNRM_FL      /* Undelete */
 173#define EXT2_COMPR_FL                   FS_COMPR_FL     /* Compress file */
 174#define EXT2_SYNC_FL                    FS_SYNC_FL      /* Synchronous updates */
 175#define EXT2_IMMUTABLE_FL               FS_IMMUTABLE_FL /* Immutable file */
 176#define EXT2_APPEND_FL                  FS_APPEND_FL    /* writes to file may only append */
 177#define EXT2_NODUMP_FL                  FS_NODUMP_FL    /* do not dump file */
 178#define EXT2_NOATIME_FL                 FS_NOATIME_FL   /* do not update atime */
 179/* Reserved for compression usage... */
 180#define EXT2_DIRTY_FL                   FS_DIRTY_FL
 181#define EXT2_COMPRBLK_FL                FS_COMPRBLK_FL  /* One or more compressed clusters */
 182#define EXT2_NOCOMP_FL                  FS_NOCOMP_FL    /* Don't compress */
 183#define EXT2_ECOMPR_FL                  FS_ECOMPR_FL    /* Compression error */
 184/* End compression flags --- maybe not all used */      
 185#define EXT2_BTREE_FL                   FS_BTREE_FL     /* btree format dir */
 186#define EXT2_INDEX_FL                   FS_INDEX_FL     /* hash-indexed directory */
 187#define EXT2_IMAGIC_FL                  FS_IMAGIC_FL    /* AFS directory */
 188#define EXT2_JOURNAL_DATA_FL            FS_JOURNAL_DATA_FL /* Reserved for ext3 */
 189#define EXT2_NOTAIL_FL                  FS_NOTAIL_FL    /* file tail should not be merged */
 190#define EXT2_DIRSYNC_FL                 FS_DIRSYNC_FL   /* dirsync behaviour (directories only) */
 191#define EXT2_TOPDIR_FL                  FS_TOPDIR_FL    /* Top of directory hierarchies*/
 192#define EXT2_RESERVED_FL                FS_RESERVED_FL  /* reserved for ext2 lib */
 193
 194#define EXT2_FL_USER_VISIBLE            FS_FL_USER_VISIBLE      /* User visible flags */
 195#define EXT2_FL_USER_MODIFIABLE         FS_FL_USER_MODIFIABLE   /* User modifiable flags */
 196
 197/*
 198 * ioctl commands
 199 */
 200#define EXT2_IOC_GETFLAGS               FS_IOC_GETFLAGS
 201#define EXT2_IOC_SETFLAGS               FS_IOC_SETFLAGS
 202#define EXT2_IOC_GETVERSION             FS_IOC_GETVERSION
 203#define EXT2_IOC_SETVERSION             FS_IOC_SETVERSION
 204#define EXT2_IOC_GETRSVSZ               _IOR('f', 5, long)
 205#define EXT2_IOC_SETRSVSZ               _IOW('f', 6, long)
 206
 207/*
 208 * ioctl commands in 32 bit emulation
 209 */
 210#define EXT2_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 211#define EXT2_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 212#define EXT2_IOC32_GETVERSION           FS_IOC32_GETVERSION
 213#define EXT2_IOC32_SETVERSION           FS_IOC32_SETVERSION
 214
 215/*
 216 * Structure of an inode on the disk
 217 */
 218struct ext2_inode {
 219        __le16  i_mode;         /* File mode */
 220        __le16  i_uid;          /* Low 16 bits of Owner Uid */
 221        __le32  i_size;         /* Size in bytes */
 222        __le32  i_atime;        /* Access time */
 223        __le32  i_ctime;        /* Creation time */
 224        __le32  i_mtime;        /* Modification time */
 225        __le32  i_dtime;        /* Deletion Time */
 226        __le16  i_gid;          /* Low 16 bits of Group Id */
 227        __le16  i_links_count;  /* Links count */
 228        __le32  i_blocks;       /* Blocks count */
 229        __le32  i_flags;        /* File flags */
 230        union {
 231                struct {
 232                        __le32  l_i_reserved1;
 233                } linux1;
 234                struct {
 235                        __le32  h_i_translator;
 236                } hurd1;
 237                struct {
 238                        __le32  m_i_reserved1;
 239                } masix1;
 240        } osd1;                         /* OS dependent 1 */
 241        __le32  i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 242        __le32  i_generation;   /* File version (for NFS) */
 243        __le32  i_file_acl;     /* File ACL */
 244        __le32  i_dir_acl;      /* Directory ACL */
 245        __le32  i_faddr;        /* Fragment address */
 246        union {
 247                struct {
 248                        __u8    l_i_frag;       /* Fragment number */
 249                        __u8    l_i_fsize;      /* Fragment size */
 250                        __u16   i_pad1;
 251                        __le16  l_i_uid_high;   /* these 2 fields    */
 252                        __le16  l_i_gid_high;   /* were reserved2[0] */
 253                        __u32   l_i_reserved2;
 254                } linux2;
 255                struct {
 256                        __u8    h_i_frag;       /* Fragment number */
 257                        __u8    h_i_fsize;      /* Fragment size */
 258                        __le16  h_i_mode_high;
 259                        __le16  h_i_uid_high;
 260                        __le16  h_i_gid_high;
 261                        __le32  h_i_author;
 262                } hurd2;
 263                struct {
 264                        __u8    m_i_frag;       /* Fragment number */
 265                        __u8    m_i_fsize;      /* Fragment size */
 266                        __u16   m_pad1;
 267                        __u32   m_i_reserved2[2];
 268                } masix2;
 269        } osd2;                         /* OS dependent 2 */
 270};
 271
 272#define i_size_high     i_dir_acl
 273
 274#if defined(__KERNEL__) || defined(__linux__)
 275#define i_reserved1     osd1.linux1.l_i_reserved1
 276#define i_frag          osd2.linux2.l_i_frag
 277#define i_fsize         osd2.linux2.l_i_fsize
 278#define i_uid_low       i_uid
 279#define i_gid_low       i_gid
 280#define i_uid_high      osd2.linux2.l_i_uid_high
 281#define i_gid_high      osd2.linux2.l_i_gid_high
 282#define i_reserved2     osd2.linux2.l_i_reserved2
 283#endif
 284
 285#ifdef  __hurd__
 286#define i_translator    osd1.hurd1.h_i_translator
 287#define i_frag          osd2.hurd2.h_i_frag;
 288#define i_fsize         osd2.hurd2.h_i_fsize;
 289#define i_uid_high      osd2.hurd2.h_i_uid_high
 290#define i_gid_high      osd2.hurd2.h_i_gid_high
 291#define i_author        osd2.hurd2.h_i_author
 292#endif
 293
 294#ifdef  __masix__
 295#define i_reserved1     osd1.masix1.m_i_reserved1
 296#define i_frag          osd2.masix2.m_i_frag
 297#define i_fsize         osd2.masix2.m_i_fsize
 298#define i_reserved2     osd2.masix2.m_i_reserved2
 299#endif
 300
 301/*
 302 * File system states
 303 */
 304#define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 305#define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 306
 307/*
 308 * Mount flags
 309 */
 310#define EXT2_MOUNT_CHECK                0x000001  /* Do mount-time checks */
 311#define EXT2_MOUNT_OLDALLOC             0x000002  /* Don't use the new Orlov allocator */
 312#define EXT2_MOUNT_GRPID                0x000004  /* Create files with directory's group */
 313#define EXT2_MOUNT_DEBUG                0x000008  /* Some debugging messages */
 314#define EXT2_MOUNT_ERRORS_CONT          0x000010  /* Continue on errors */
 315#define EXT2_MOUNT_ERRORS_RO            0x000020  /* Remount fs ro on errors */
 316#define EXT2_MOUNT_ERRORS_PANIC         0x000040  /* Panic on errors */
 317#define EXT2_MOUNT_MINIX_DF             0x000080  /* Mimics the Minix statfs */
 318#define EXT2_MOUNT_NOBH                 0x000100  /* No buffer_heads */
 319#define EXT2_MOUNT_NO_UID32             0x000200  /* Disable 32-bit UIDs */
 320#define EXT2_MOUNT_XATTR_USER           0x004000  /* Extended user attributes */
 321#define EXT2_MOUNT_POSIX_ACL            0x008000  /* POSIX Access Control Lists */
 322#define EXT2_MOUNT_XIP                  0x010000  /* Execute in place */
 323#define EXT2_MOUNT_USRQUOTA             0x020000  /* user quota */
 324#define EXT2_MOUNT_GRPQUOTA             0x040000  /* group quota */
 325#define EXT2_MOUNT_RESERVATION          0x080000  /* Preallocation */
 326
 327
 328#define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 329#define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 330#define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 331                                         EXT2_MOUNT_##opt)
 332/*
 333 * Maximal mount counts between two filesystem checks
 334 */
 335#define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 336#define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 337
 338/*
 339 * Behaviour when detecting errors
 340 */
 341#define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 342#define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 343#define EXT2_ERRORS_PANIC               3       /* Panic */
 344#define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 345
 346/*
 347 * Structure of the super block
 348 */
 349struct ext2_super_block {
 350        __le32  s_inodes_count;         /* Inodes count */
 351        __le32  s_blocks_count;         /* Blocks count */
 352        __le32  s_r_blocks_count;       /* Reserved blocks count */
 353        __le32  s_free_blocks_count;    /* Free blocks count */
 354        __le32  s_free_inodes_count;    /* Free inodes count */
 355        __le32  s_first_data_block;     /* First Data Block */
 356        __le32  s_log_block_size;       /* Block size */
 357        __le32  s_log_frag_size;        /* Fragment size */
 358        __le32  s_blocks_per_group;     /* # Blocks per group */
 359        __le32  s_frags_per_group;      /* # Fragments per group */
 360        __le32  s_inodes_per_group;     /* # Inodes per group */
 361        __le32  s_mtime;                /* Mount time */
 362        __le32  s_wtime;                /* Write time */
 363        __le16  s_mnt_count;            /* Mount count */
 364        __le16  s_max_mnt_count;        /* Maximal mount count */
 365        __le16  s_magic;                /* Magic signature */
 366        __le16  s_state;                /* File system state */
 367        __le16  s_errors;               /* Behaviour when detecting errors */
 368        __le16  s_minor_rev_level;      /* minor revision level */
 369        __le32  s_lastcheck;            /* time of last check */
 370        __le32  s_checkinterval;        /* max. time between checks */
 371        __le32  s_creator_os;           /* OS */
 372        __le32  s_rev_level;            /* Revision level */
 373        __le16  s_def_resuid;           /* Default uid for reserved blocks */
 374        __le16  s_def_resgid;           /* Default gid for reserved blocks */
 375        /*
 376         * These fields are for EXT2_DYNAMIC_REV superblocks only.
 377         *
 378         * Note: the difference between the compatible feature set and
 379         * the incompatible feature set is that if there is a bit set
 380         * in the incompatible feature set that the kernel doesn't
 381         * know about, it should refuse to mount the filesystem.
 382         * 
 383         * e2fsck's requirements are more strict; if it doesn't know
 384         * about a feature in either the compatible or incompatible
 385         * feature set, it must abort and not try to meddle with
 386         * things it doesn't understand...
 387         */
 388        __le32  s_first_ino;            /* First non-reserved inode */
 389        __le16   s_inode_size;          /* size of inode structure */
 390        __le16  s_block_group_nr;       /* block group # of this superblock */
 391        __le32  s_feature_compat;       /* compatible feature set */
 392        __le32  s_feature_incompat;     /* incompatible feature set */
 393        __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 394        __u8    s_uuid[16];             /* 128-bit uuid for volume */
 395        char    s_volume_name[16];      /* volume name */
 396        char    s_last_mounted[64];     /* directory where last mounted */
 397        __le32  s_algorithm_usage_bitmap; /* For compression */
 398        /*
 399         * Performance hints.  Directory preallocation should only
 400         * happen if the EXT2_COMPAT_PREALLOC flag is on.
 401         */
 402        __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 403        __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 404        __u16   s_padding1;
 405        /*
 406         * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 407         */
 408        __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 409        __u32   s_journal_inum;         /* inode number of journal file */
 410        __u32   s_journal_dev;          /* device number of journal file */
 411        __u32   s_last_orphan;          /* start of list of inodes to delete */
 412        __u32   s_hash_seed[4];         /* HTREE hash seed */
 413        __u8    s_def_hash_version;     /* Default hash version to use */
 414        __u8    s_reserved_char_pad;
 415        __u16   s_reserved_word_pad;
 416        __le32  s_default_mount_opts;
 417        __le32  s_first_meta_bg;        /* First metablock block group */
 418        __u32   s_reserved[190];        /* Padding to the end of the block */
 419};
 420
 421/*
 422 * Codes for operating systems
 423 */
 424#define EXT2_OS_LINUX           0
 425#define EXT2_OS_HURD            1
 426#define EXT2_OS_MASIX           2
 427#define EXT2_OS_FREEBSD         3
 428#define EXT2_OS_LITES           4
 429
 430/*
 431 * Revision levels
 432 */
 433#define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 434#define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 435
 436#define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 437#define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 438
 439#define EXT2_GOOD_OLD_INODE_SIZE 128
 440
 441/*
 442 * Feature set definitions
 443 */
 444
 445#define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 446        ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 447#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 448        ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 449#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 450        ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 451#define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
 452        EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 453#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 454        EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 455#define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
 456        EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 457#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 458        EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 459#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 460        EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 461#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 462        EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 463
 464#define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 465#define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 466#define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 467#define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 468#define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
 469#define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 470#define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
 471
 472#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 473#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 474#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 475#define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
 476
 477#define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 478#define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 479#define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
 480#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
 481#define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 482#define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
 483
 484#define EXT2_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 485#define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
 486                                         EXT2_FEATURE_INCOMPAT_META_BG)
 487#define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 488                                         EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 489                                         EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 490#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
 491#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
 492
 493/*
 494 * Default values for user and/or group using reserved blocks
 495 */
 496#define EXT2_DEF_RESUID         0
 497#define EXT2_DEF_RESGID         0
 498
 499/*
 500 * Default mount options
 501 */
 502#define EXT2_DEFM_DEBUG         0x0001
 503#define EXT2_DEFM_BSDGROUPS     0x0002
 504#define EXT2_DEFM_XATTR_USER    0x0004
 505#define EXT2_DEFM_ACL           0x0008
 506#define EXT2_DEFM_UID16         0x0010
 507    /* Not used by ext2, but reserved for use by ext3 */
 508#define EXT3_DEFM_JMODE         0x0060 
 509#define EXT3_DEFM_JMODE_DATA    0x0020
 510#define EXT3_DEFM_JMODE_ORDERED 0x0040
 511#define EXT3_DEFM_JMODE_WBACK   0x0060
 512
 513/*
 514 * Structure of a directory entry
 515 */
 516#define EXT2_NAME_LEN 255
 517
 518struct ext2_dir_entry {
 519        __le32  inode;                  /* Inode number */
 520        __le16  rec_len;                /* Directory entry length */
 521        __le16  name_len;               /* Name length */
 522        char    name[EXT2_NAME_LEN];    /* File name */
 523};
 524
 525/*
 526 * The new version of the directory entry.  Since EXT2 structures are
 527 * stored in intel byte order, and the name_len field could never be
 528 * bigger than 255 chars, it's safe to reclaim the extra byte for the
 529 * file_type field.
 530 */
 531struct ext2_dir_entry_2 {
 532        __le32  inode;                  /* Inode number */
 533        __le16  rec_len;                /* Directory entry length */
 534        __u8    name_len;               /* Name length */
 535        __u8    file_type;
 536        char    name[EXT2_NAME_LEN];    /* File name */
 537};
 538
 539/*
 540 * Ext2 directory file types.  Only the low 3 bits are used.  The
 541 * other bits are reserved for now.
 542 */
 543enum {
 544        EXT2_FT_UNKNOWN,
 545        EXT2_FT_REG_FILE,
 546        EXT2_FT_DIR,
 547        EXT2_FT_CHRDEV,
 548        EXT2_FT_BLKDEV,
 549        EXT2_FT_FIFO,
 550        EXT2_FT_SOCK,
 551        EXT2_FT_SYMLINK,
 552        EXT2_FT_MAX
 553};
 554
 555/*
 556 * EXT2_DIR_PAD defines the directory entries boundaries
 557 *
 558 * NOTE: It must be a multiple of 4
 559 */
 560#define EXT2_DIR_PAD                    4
 561#define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 562#define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 563                                         ~EXT2_DIR_ROUND)
 564#define EXT2_MAX_REC_LEN                ((1<<16)-1)
 565
 566#endif  /* _LINUX_EXT2_FS_H */
 567