sys/vfs/gnu/ext2fs/ext2_fs.h

   1 /*
   2  *  modified for EXT2FS support in Lites 1.1
   3  *
   4  *  Aug 1995, Godmar Back (gback@cs.utah.edu)
   5  *  University of Utah, Department of Computer Science
   6  *
   7  * $FreeBSD: src/sys/gnu/ext2fs/ext2_fs.h,v 1.8.2.2 2001/09/29 12:52:47 iedowse Exp $
   8  * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_fs.h,v 1.6 2006/12/23 00:41:29 swildner Exp $
   9  */
  10 /*
  11  *  linux/include/linux/ext2_fs.h
  12  *
  13  * Copyright (C) 1992, 1993, 1994, 1995
  14  * Remy Card (card@masi.ibp.fr)
  15  * Laboratoire MASI - Institut Blaise Pascal
  16  * Universite Pierre et Marie Curie (Paris VI)
  17  *
  18  *  from
  19  *
  20  *  linux/include/linux/minix_fs.h
  21  *
  22  *  Copyright (C) 1991, 1992  Linus Torvalds
  23  */
  24
  25 #ifndef _LINUX_EXT2_FS_H
  26 #define _LINUX_EXT2_FS_H
  27
  28 #include <sys/types.h>
  29 #include <sys/ioccom.h>
  30
  31 #define __u32 u_int32_t
  32 #define u32   u_int32_t
  33 #define __u16 u_int16_t
  34 #define __u8  u_int8_t
  35
  36 #define __s32 int32_t
  37 #define __s16 int16_t
  38 #define __s8  int8_t
  39
  40 #define umode_t mode_t
  41 #define loff_t  off_t
  42
  43 /* the Linux implementation of EXT2 stores some information about
  44  * an inode in a ext2_inode_info structure which is part of the incore
  45  * inode in Linux
  46  * I decided to use the "spare" fields instead - we'll see how this
  47  * works out
  48  */
  49
  50 #define i_block_group           i_spare[0]
  51 #define i_next_alloc_block      i_spare[1]
  52 #define i_next_alloc_goal       i_spare[2]
  53 #define i_prealloc_block        i_din.di_spare[0]
  54 #define i_prealloc_count        i_din.di_spare[1]
  55
  56 /*
  57  * The second extended filesystem constants/structures
  58  */
  59
  60 /*
  61  * Define EXT2FS_DEBUG to produce debug messages
  62  */
  63 #undef EXT2FS_DEBUG
  64
  65 /*
  66  * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
  67  */
  68 #define EXT2_PREALLOCATE
  69 #define EXT2_DEFAULT_PREALLOC_BLOCKS    8
  70
  71 /*
  72  * The second extended file system version
  73  */
  74 #define EXT2FS_DATE             "95/08/09"
  75 #define EXT2FS_VERSION          "0.5b"
  76
  77 /*
  78  * Debug code
  79  */
  80 #ifdef EXT2FS_DEBUG
  81 #       define ext2_debug(f, a...)      { \
  82                                         kprintf ("EXT2-fs DEBUG (%s, %d): %s:", \
  83                                                 __FILE__, __LINE__, __func__); \
  84                                         kprintf (f, ## a); \
  85                                         }
  86 #else
  87 #       define ext2_debug(f, a...)      /**/
  88 #endif
  89
  90 /*
  91  * Special inodes numbers
  92  */
  93 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  94 #define EXT2_ROOT_INO            2      /* Root inode */
  95 #define EXT2_ACL_IDX_INO         3      /* ACL inode */
  96 #define EXT2_ACL_DATA_INO        4      /* ACL inode */
  97 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  98 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  99
 100 /* First non-reserved inode for old ext2 filesystems */
 101 #define EXT2_GOOD_OLD_FIRST_INO 11
 102
 103 /*
 104  * The second extended file system magic number
 105  */
 106 #define EXT2_SUPER_MAGIC        0xEF53
 107
 108 /*
 109  * Maximal count of links to a file
 110  */
 111 #define EXT2_LINK_MAX           32000
 112
 113 /*
 114  * Note: under FreeBSD, the "user" versions of the following macros are
 115  * used (and must be used) in most cases, because ((s)->u.ext2_sb.s_es is
 116  * not accessible.  This depends on __KERNEL__ not being defined for
 117  * kernel builds under FreeBSD.
 118  */
 119
 120 /*
 121  * Macro-instructions used to manage several block sizes
 122  */
 123 #define EXT2_MIN_BLOCK_SIZE             1024
 124 #define EXT2_MAX_BLOCK_SIZE             4096
 125 #define EXT2_MIN_BLOCK_LOG_SIZE           10
 126 #if defined(__KERNEL__) || (defined(__DragonFly__) && defined(_KERNEL))
 127 # define EXT2_BLOCK_SIZE(s)             ((s)->s_blocksize)
 128 #else
 129 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 130 #endif
 131 #define EXT2_ACLE_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
 132 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
 133 #ifdef __KERNEL__
 134 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 135 #else
 136 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 137 #endif
 138 #if defined(__KERNEL__) || defined _KERNEL
 139 #define EXT2_ADDR_PER_BLOCK_BITS(s)     ((s)->s_addr_per_block_bits)
 140 #define EXT2_INODE_SIZE(s)              ((s)->s_inode_size)
 141 #define EXT2_FIRST_INO(s)               ((s)->s_first_ino)
 142 #else
 143 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
 144                                  EXT2_GOOD_OLD_INODE_SIZE : \
 145                                  (s)->s_inode_size)
 146 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
 147                                  EXT2_GOOD_OLD_FIRST_INO : \
 148                                  (s)->s_first_ino)
 149 #endif
 150 #define EXT2_INODES_PER_BLOCK(s)        ((s)->s_inodes_per_block)
 151 /*
 152  * Macro-instructions used to manage fragments
 153  */
 154 #define EXT2_MIN_FRAG_SIZE              1024
 155 #define EXT2_MAX_FRAG_SIZE              4096
 156 #define EXT2_MIN_FRAG_LOG_SIZE            10
 157 #ifdef __KERNEL__
 158 # define EXT2_FRAG_SIZE(s)              ((s)->u.ext2_sb.s_frag_size)
 159 # define EXT2_FRAGS_PER_BLOCK(s)        ((s)->u.ext2_sb.s_frags_per_block)
 160 #else
 161 # if defined(_KERNEL) && defined(__DragonFly__)
 162 # define EXT2_FRAG_SIZE(s)              ((s)->s_frag_size)
 163 # else
 164 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 165 # endif
 166 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 167 #endif
 168
 169 /*
 170  * ACL structures
 171  */
 172 struct ext2_acl_header  /* Header of Access Control Lists */
 173 {
 174         __u32   aclh_size;
 175         __u32   aclh_file_count;
 176         __u32   aclh_acle_count;
 177         __u32   aclh_first_acle;
 178 };
 179
 180 struct ext2_acl_entry   /* Access Control List Entry */
 181 {
 182         __u32   acle_size;
 183         __u16   acle_perms;     /* Access permissions */
 184         __u16   acle_type;      /* Type of entry */
 185         __u16   acle_tag;       /* User or group identity */
 186         __u16   acle_pad1;
 187         __u32   acle_next;      /* Pointer on next entry for the */
 188                                         /* same inode or on next free entry */
 189 };
 190
 191 /*
 192  * Structure of a blocks group descriptor
 193  */
 194 struct ext2_group_desc
 195 {
 196         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 197         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 198         __u32   bg_inode_table;         /* Inodes table block */
 199         __u16   bg_free_blocks_count;   /* Free blocks count */
 200         __u16   bg_free_inodes_count;   /* Free inodes count */
 201         __u16   bg_used_dirs_count;     /* Directories count */
 202         __u16   bg_pad;
 203         __u32   bg_reserved[3];
 204 };
 205
 206 /*
 207  * Macro-instructions used to manage group descriptors
 208  */
 209 #ifdef __KERNEL__
 210 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->u.ext2_sb.s_blocks_per_group)
 211 # define EXT2_DESC_PER_BLOCK(s)         ((s)->u.ext2_sb.s_desc_per_block)
 212 # define EXT2_INODES_PER_GROUP(s)       ((s)->u.ext2_sb.s_inodes_per_group)
 213 # define EXT2_DESC_PER_BLOCK_BITS(s)    ((s)->u.ext2_sb.s_desc_per_block_bits)
 214 #else
 215 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 216 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 217 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 218 #endif
 219
 220 /*
 221  * Constants relative to the data blocks
 222  */
 223 #define EXT2_NDIR_BLOCKS                12
 224 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 225 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 226 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 227 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 228 #define EXT2_MAXSYMLINKLEN              (EXT2_N_BLOCKS * sizeof (__u32))
 229
 230 /*
 231  * Inode flags
 232  */
 233 #define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 234 #define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 235 #define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 236 #define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 237 #define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 238 #define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 239 #define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 240 #define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 241 /* Reserved for compression usage... */
 242 #define EXT2_DIRTY_FL                   0x00000100
 243 #define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 244 #define EXT2_NOCOMP_FL                  0x00000400 /* Don't compress */
 245 #define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 246 /* End compression flags --- maybe not all used */
 247 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 248 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 249
 250 #define EXT2_FL_USER_VISIBLE            0x00001FFF /* User visible flags */
 251 #define EXT2_FL_USER_MODIFIABLE         0x000000FF /* User modifiable flags */
 252
 253 /*
 254  * ioctl commands
 255  */
 256 #define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 257 #define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 258 #define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 259 #define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 260
 261 /*
 262  * Only declare `struct ext2_inode' if <vfs/ufs/inode.h> hasn't made things
 263  * difficult by #defining i_mode and other struct members.  The details of
 264  * the struct are only needed in ext2_inode_cnv.c where the ext2fs on-disk
 265  * inode is converted to a ufs in-core inode.
 266  */
 267 #ifndef i_mode
 268
 269 /*
 270  * Structure of an inode on the disk
 271  */
 272 struct ext2_inode {
 273         __u16   i_mode;         /* File mode */
 274         __u16   i_uid;          /* Owner Uid */
 275         __u32   i_size;         /* Size in bytes */
 276         __u32   i_atime;        /* Access time */
 277         __u32   i_ctime;        /* Creation time */
 278         __u32   i_mtime;        /* Modification time */
 279         __u32   i_dtime;        /* Deletion Time */
 280         __u16   i_gid;          /* Group Id */
 281         __u16   i_links_count;  /* Links count */
 282         __u32   i_blocks;       /* Blocks count */
 283         __u32   i_flags;        /* File flags */
 284         union {
 285                 struct {
 286                         __u32  l_i_reserved1;
 287                 } linux1;
 288                 struct {
 289                         __u32  h_i_translator;
 290                 } hurd1;
 291                 struct {
 292                         __u32  m_i_reserved1;
 293                 } masix1;
 294         } osd1;                         /* OS dependent 1 */
 295         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 296         __u32   i_generation;   /* File version (for NFS) */
 297         __u32   i_file_acl;     /* File ACL */
 298         __u32   i_dir_acl;      /* Directory ACL */
 299         __u32   i_faddr;        /* Fragment address */
 300         union {
 301                 struct {
 302                         __u8    l_i_frag;       /* Fragment number */
 303                         __u8    l_i_fsize;      /* Fragment size */
 304                         __u16   i_pad1;
 305                         __u32   l_i_reserved2[2];
 306                 } linux2;
 307                 struct {
 308                         __u8    h_i_frag;       /* Fragment number */
 309                         __u8    h_i_fsize;      /* Fragment size */
 310                         __u16   h_i_mode_high;
 311                         __u16   h_i_uid_high;
 312                         __u16   h_i_gid_high;
 313                         __u32   h_i_author;
 314                 } hurd2;
 315                 struct {
 316                         __u8    m_i_frag;       /* Fragment number */
 317                         __u8    m_i_fsize;      /* Fragment size */
 318                         __u16   m_pad1;
 319                         __u32   m_i_reserved2[2];
 320                 } masix2;
 321         } osd2;                         /* OS dependent 2 */
 322 };
 323
 324 #define i_size_high     i_dir_acl
 325
 326 #if defined(__KERNEL__) || defined(__linux__)
 327 #define i_reserved1     osd1.linux1.l_i_reserved1
 328 #define i_frag          osd2.linux2.l_i_frag
 329 #define i_fsize         osd2.linux2.l_i_fsize
 330 #define i_reserved2     osd2.linux2.l_i_reserved2
 331 #endif
 332
 333 #ifdef  __hurd__
 334 #define i_translator    osd1.hurd1.h_i_translator
 335 #define i_frag          osd2.hurd2.h_i_frag;
 336 #define i_fsize         osd2.hurd2.h_i_fsize;
 337 #define i_uid_high      osd2.hurd2.h_i_uid_high
 338 #define i_gid_high      osd2.hurd2.h_i_gid_high
 339 #define i_author        osd2.hurd2.h_i_author
 340 #endif
 341
 342 #ifdef  __masix__
 343 #define i_reserved1     osd1.masix1.m_i_reserved1
 344 #define i_frag          osd2.masix2.m_i_frag
 345 #define i_fsize         osd2.masix2.m_i_fsize
 346 #define i_reserved2     osd2.masix2.m_i_reserved2
 347 #endif
 348
 349 #endif /* i_mode */
 350
 351 /*
 352  * File system states
 353  */
 354 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 355 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 356
 357 /*
 358  * Mount flags
 359  */
 360 #define EXT2_MOUNT_CHECK_NORMAL         0x0001  /* Do some more checks */
 361 #define EXT2_MOUNT_CHECK_STRICT         0x0002  /* Do again more checks */
 362 #define EXT2_MOUNT_CHECK                (EXT2_MOUNT_CHECK_NORMAL | \
 363                                          EXT2_MOUNT_CHECK_STRICT)
 364 #define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 365 #define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 366 #define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 367 #define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 368 #define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 369 #define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 370
 371 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 372 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 373 #define test_opt(sb, opt)               ((sb)->u.ext2_sb.s_mount_opt & \
 374                                          EXT2_MOUNT_##opt)
 375 /*
 376  * Maximal mount counts between two filesystem checks
 377  */
 378 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 379 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 380
 381 /*
 382  * Behaviour when detecting errors
 383  */
 384 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 385 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 386 #define EXT2_ERRORS_PANIC               3       /* Panic */
 387 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 388
 389 /*
 390  * Structure of the super block
 391  */
 392 struct ext2_super_block {
 393         __u32   s_inodes_count;         /* Inodes count */
 394         __u32   s_blocks_count;         /* Blocks count */
 395         __u32   s_r_blocks_count;       /* Reserved blocks count */
 396         __u32   s_free_blocks_count;    /* Free blocks count */
 397         __u32   s_free_inodes_count;    /* Free inodes count */
 398         __u32   s_first_data_block;     /* First Data Block */
 399         __u32   s_log_block_size;       /* Block size */
 400         __s32   s_log_frag_size;        /* Fragment size */
 401         __u32   s_blocks_per_group;     /* # Blocks per group */
 402         __u32   s_frags_per_group;      /* # Fragments per group */
 403         __u32   s_inodes_per_group;     /* # Inodes per group */
 404         __u32   s_mtime;                /* Mount time */
 405         __u32   s_wtime;                /* Write time */
 406         __u16   s_mnt_count;            /* Mount count */
 407         __s16   s_max_mnt_count;        /* Maximal mount count */
 408         __u16   s_magic;                /* Magic signature */
 409         __u16   s_state;                /* File system state */
 410         __u16   s_errors;               /* Behaviour when detecting errors */
 411         __u16   s_minor_rev_level;      /* minor revision level */
 412         __u32   s_lastcheck;            /* time of last check */
 413         __u32   s_checkinterval;        /* max. time between checks */
 414         __u32   s_creator_os;           /* OS */
 415         __u32   s_rev_level;            /* Revision level */
 416         __u16   s_def_resuid;           /* Default uid for reserved blocks */
 417         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 418         /*
 419          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 420          *
 421          * Note: the difference between the compatible feature set and
 422          * the incompatible feature set is that if there is a bit set
 423          * in the incompatible feature set that the kernel doesn't
 424          * know about, it should refuse to mount the filesystem.
 425          *
 426          * e2fsck's requirements are more strict; if it doesn't know
 427          * about a feature in either the compatible or incompatible
 428          * feature set, it must abort and not try to meddle with
 429          * things it doesn't understand...
 430          */
 431         __u32   s_first_ino;            /* First non-reserved inode */
 432         __u16   s_inode_size;           /* size of inode structure */
 433         __u16   s_block_group_nr;       /* block group # of this superblock */
 434         __u32   s_feature_compat;       /* compatible feature set */
 435         __u32   s_feature_incompat;     /* incompatible feature set */
 436         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 437         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 438         char    s_volume_name[16];      /* volume name */
 439         char    s_last_mounted[64];     /* directory where last mounted */
 440         __u32   s_algorithm_usage_bitmap; /* For compression */
 441         /*
 442          * Performance hints.  Directory preallocation should only
 443          * happen if the EXT2_COMPAT_PREALLOC flag is on.
 444          */
 445         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 446         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 447         __u16   s_padding1;
 448         __u32   s_reserved[204];        /* Padding to the end of the block */
 449 };
 450
 451 #ifdef __KERNEL__
 452 #define EXT2_SB(sb)     (&((sb)->u.ext2_sb))
 453 #else
 454 /* Assume that user mode programs are passing in an ext2fs superblock, not
 455  * a kernel struct super_block.  This will allow us to call the feature-test
 456  * macros from user land. */
 457 #define EXT2_SB(sb)     (sb)
 458 #endif
 459
 460 /*
 461  * Codes for operating systems
 462  */
 463 #define EXT2_OS_LINUX           0
 464 #define EXT2_OS_HURD            1
 465 #define EXT2_OS_MASIX           2
 466 #define EXT2_OS_FREEBSD         3
 467 #define EXT2_OS_LITES           4
 468
 469 /*
 470  * Revision levels
 471  */
 472 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 473 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 474
 475 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 476 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 477
 478 #define EXT2_GOOD_OLD_INODE_SIZE 128
 479
 480 /*
 481  * Feature set definitions
 482  */
 483
 484 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 485         ( EXT2_SB(sb)->s_feature_compat & (mask) )
 486 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 487         ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
 488 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 489         ( EXT2_SB(sb)->s_feature_incompat & (mask) )
 490
 491 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 492
 493 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 494 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 495 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 496
 497 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 498 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 499
 500 #define EXT2_FEATURE_COMPAT_SUPP        0
 501 #define EXT2_FEATURE_INCOMPAT_SUPP      EXT2_FEATURE_INCOMPAT_FILETYPE
 502 #ifdef notyet
 503 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 504                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 505                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 506 #else
 507 #define EXT2_FEATURE_RO_COMPAT_SUPP     EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
 508 #endif
 509
 510 /*
 511  * Default values for user and/or group using reserved blocks
 512  */
 513 #define EXT2_DEF_RESUID         0
 514 #define EXT2_DEF_RESGID         0
 515
 516 /*
 517  * Structure of a directory entry
 518  */
 519 #define EXT2_NAME_LEN 255
 520
 521 struct ext2_dir_entry {
 522         __u32   inode;                  /* Inode number */
 523         __u16   rec_len;                /* Directory entry length */
 524         __u16   name_len;               /* Name length */
 525         char    name[EXT2_NAME_LEN];    /* File name */
 526 };
 527
 528 /*
 529  * The new version of the directory entry.  Since EXT2 structures are
 530  * stored in intel byte order, and the name_len field could never be
 531  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 532  * file_type field.
 533  */
 534 struct ext2_dir_entry_2 {
 535         __u32   inode;                  /* Inode number */
 536         __u16   rec_len;                /* Directory entry length */
 537         __u8    name_len;               /* Name length */
 538         __u8    file_type;
 539         char    name[EXT2_NAME_LEN];    /* File name */
 540 };
 541
 542 /*
 543  * Ext2 directory file types.  Only the low 3 bits are used.  The
 544  * other bits are reserved for now.
 545  */
 546 #define EXT2_FT_UNKNOWN         0
 547 #define EXT2_FT_REG_FILE        1
 548 #define EXT2_FT_DIR             2
 549 #define EXT2_FT_CHRDEV          3
 550 #define EXT2_FT_BLKDEV          4
 551 #define EXT2_FT_FIFO            5
 552 #define EXT2_FT_SOCK            6
 553 #define EXT2_FT_SYMLINK         7
 554
 555 #define EXT2_FT_MAX             8
 556
 557 /*
 558  * EXT2_DIR_PAD defines the directory entries boundaries
 559  *
 560  * NOTE: It must be a multiple of 4
 561  */
 562 #define EXT2_DIR_PAD                    4
 563 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 564 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 565                                          ~EXT2_DIR_ROUND)
 566
 567 #endif  /* _LINUX_EXT2_FS_H */