extlinux/ext2_fs.h

   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 /* Private copy for extlinux */
  17
  18 #ifndef _LINUX_EXT2_FS_H
  19 #define _LINUX_EXT2_FS_H
  20
  21 #include <linux/types.h>
  22
  23 /*
  24  * The second extended filesystem constants/structures
  25  */
  26
  27 /*
  28  * Define EXT2FS_DEBUG to produce debug messages
  29  */
  30 #undef EXT2FS_DEBUG
  31
  32 /*
  33  * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
  34  */
  35 #define EXT2_PREALLOCATE
  36 #define EXT2_DEFAULT_PREALLOC_BLOCKS    8
  37
  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_ACL_IDX_INO         3      /* ACL inode */
  63 #define EXT2_ACL_DATA_INO        4      /* ACL inode */
  64 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  65 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  66
  67 /* First non-reserved inode for old ext2 filesystems */
  68 #define EXT2_GOOD_OLD_FIRST_INO 11
  69
  70 /*
  71  * The second extended file system magic number
  72  */
  73 #define EXT2_SUPER_MAGIC        0xEF53
  74
  75 /*
  76  * Maximal count of links to a file
  77  */
  78 #define EXT2_LINK_MAX           32000
  79
  80 /*
  81  * Macro-instructions used to manage several block sizes
  82  */
  83 #define EXT2_MIN_BLOCK_SIZE             1024
  84 #define EXT2_MAX_BLOCK_SIZE             4096
  85 #define EXT2_MIN_BLOCK_LOG_SIZE           10
  86 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  87 #define EXT2_ACLE_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
  88 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
  89 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  90 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  91                                  EXT2_GOOD_OLD_INODE_SIZE : \
  92                                  (s)->s_inode_size)
  93 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  94                                  EXT2_GOOD_OLD_FIRST_INO : \
  95                                  (s)->s_first_ino)
  96
  97 /*
  98  * Macro-instructions used to manage fragments
  99  */
 100 #define EXT2_MIN_FRAG_SIZE              1024
 101 #define EXT2_MAX_FRAG_SIZE              4096
 102 #define EXT2_MIN_FRAG_LOG_SIZE            10
 103 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 104 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 105
 106 /*
 107  * ACL structures
 108  */
 109 struct ext2_acl_header  /* Header of Access Control Lists */
 110 {
 111         __u32   aclh_size;
 112         __u32   aclh_file_count;
 113         __u32   aclh_acle_count;
 114         __u32   aclh_first_acle;
 115 };
 116
 117 struct ext2_acl_entry   /* Access Control List Entry */
 118 {
 119         __u32   acle_size;
 120         __u16   acle_perms;     /* Access permissions */
 121         __u16   acle_type;      /* Type of entry */
 122         __u16   acle_tag;       /* User or group identity */
 123         __u16   acle_pad1;
 124         __u32   acle_next;      /* Pointer on next entry for the */
 125                                         /* same inode or on next free entry */
 126 };
 127
 128 /*
 129  * Structure of a blocks group descriptor
 130  */
 131 struct ext2_group_desc
 132 {
 133         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 134         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 135         __u32   bg_inode_table;         /* Inodes table block */
 136         __u16   bg_free_blocks_count;   /* Free blocks count */
 137         __u16   bg_free_inodes_count;   /* Free inodes count */
 138         __u16   bg_used_dirs_count;     /* Directories count */
 139         __u16   bg_pad;
 140         __u32   bg_reserved[3];
 141 };
 142
 143 /*
 144  * Macro-instructions used to manage group descriptors
 145  */
 146 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 147 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 148 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 149
 150 /*
 151  * Constants relative to the data blocks
 152  */
 153 #define EXT2_NDIR_BLOCKS                12
 154 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 155 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 156 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 157 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 158
 159 /*
 160  * Inode flags
 161  */
 162 #define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 163 #define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 164 #define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 165 #define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 166 #define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 167 #define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 168 #define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 169 #define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 170 /* Reserved for compression usage... */
 171 #define EXT2_DIRTY_FL                   0x00000100
 172 #define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 173 #define EXT2_NOCOMP_FL                  0x00000400 /* Don't compress */
 174 #define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 175 /* End compression flags --- maybe not all used */
 176 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 177 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 178
 179 #define EXT2_FL_USER_VISIBLE            0x00001FFF /* User visible flags */
 180 #define EXT2_FL_USER_MODIFIABLE         0x000000FF /* User modifiable flags */
 181
 182 /*
 183  * ioctl commands
 184  */
 185 #define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 186 #define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 187 #define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 188 #define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 189
 190 /*
 191  * Structure of an inode on the disk
 192  */
 193 struct ext2_inode {
 194         __u16   i_mode;         /* File mode */
 195         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 196         __u32   i_size;         /* Size in bytes */
 197         __u32   i_atime;        /* Access time */
 198         __u32   i_ctime;        /* Creation time */
 199         __u32   i_mtime;        /* Modification time */
 200         __u32   i_dtime;        /* Deletion Time */
 201         __u16   i_gid;          /* Low 16 bits of Group Id */
 202         __u16   i_links_count;  /* Links count */
 203         __u32   i_blocks;       /* Blocks count */
 204         __u32   i_flags;        /* File flags */
 205         union {
 206                 struct {
 207                         __u32  l_i_reserved1;
 208                 } linux1;
 209                 struct {
 210                         __u32  h_i_translator;
 211                 } hurd1;
 212                 struct {
 213                         __u32  m_i_reserved1;
 214                 } masix1;
 215         } osd1;                         /* OS dependent 1 */
 216         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 217         __u32   i_generation;   /* File version (for NFS) */
 218         __u32   i_file_acl;     /* File ACL */
 219         __u32   i_dir_acl;      /* Directory ACL */
 220         __u32   i_faddr;        /* Fragment address */
 221         union {
 222                 struct {
 223                         __u8    l_i_frag;       /* Fragment number */
 224                         __u8    l_i_fsize;      /* Fragment size */
 225                         __u16   i_pad1;
 226                         __u16   l_i_uid_high;   /* these 2 fields    */
 227                         __u16   l_i_gid_high;   /* were reserved2[0] */
 228                         __u32   l_i_reserved2;
 229                 } linux2;
 230                 struct {
 231                         __u8    h_i_frag;       /* Fragment number */
 232                         __u8    h_i_fsize;      /* Fragment size */
 233                         __u16   h_i_mode_high;
 234                         __u16   h_i_uid_high;
 235                         __u16   h_i_gid_high;
 236                         __u32   h_i_author;
 237                 } hurd2;
 238                 struct {
 239                         __u8    m_i_frag;       /* Fragment number */
 240                         __u8    m_i_fsize;      /* Fragment size */
 241                         __u16   m_pad1;
 242                         __u32   m_i_reserved2[2];
 243                 } masix2;
 244         } osd2;                         /* OS dependent 2 */
 245 };
 246
 247 #define i_size_high     i_dir_acl
 248
 249 #if defined(__KERNEL__) || defined(__linux__)
 250 #define i_reserved1     osd1.linux1.l_i_reserved1
 251 #define i_frag          osd2.linux2.l_i_frag
 252 #define i_fsize         osd2.linux2.l_i_fsize
 253 #define i_uid_low       i_uid
 254 #define i_gid_low       i_gid
 255 #define i_uid_high      osd2.linux2.l_i_uid_high
 256 #define i_gid_high      osd2.linux2.l_i_gid_high
 257 #define i_reserved2     osd2.linux2.l_i_reserved2
 258 #endif
 259
 260 #ifdef  __hurd__
 261 #define i_translator    osd1.hurd1.h_i_translator
 262 #define i_frag          osd2.hurd2.h_i_frag;
 263 #define i_fsize         osd2.hurd2.h_i_fsize;
 264 #define i_uid_high      osd2.hurd2.h_i_uid_high
 265 #define i_gid_high      osd2.hurd2.h_i_gid_high
 266 #define i_author        osd2.hurd2.h_i_author
 267 #endif
 268
 269 #ifdef  __masix__
 270 #define i_reserved1     osd1.masix1.m_i_reserved1
 271 #define i_frag          osd2.masix2.m_i_frag
 272 #define i_fsize         osd2.masix2.m_i_fsize
 273 #define i_reserved2     osd2.masix2.m_i_reserved2
 274 #endif
 275
 276 /*
 277  * File system states
 278  */
 279 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 280 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 281
 282 /*
 283  * Mount flags
 284  */
 285 #define EXT2_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 286 #define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 287 #define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 288 #define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 289 #define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 290 #define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 291 #define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 292 #define EXT2_MOUNT_NO_UID32             0x0200  /* Disable 32-bit UIDs */
 293
 294 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 295 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 296 #define test_opt(sb, opt)               ((sb)->u.ext2_sb.s_mount_opt & \
 297                                          EXT2_MOUNT_##opt)
 298 /*
 299  * Maximal mount counts between two filesystem checks
 300  */
 301 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 302 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 303
 304 /*
 305  * Behaviour when detecting errors
 306  */
 307 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 308 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 309 #define EXT2_ERRORS_PANIC               3       /* Panic */
 310 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 311
 312 /*
 313  * Structure of the super block
 314  */
 315 struct ext2_super_block {
 316         __u32   s_inodes_count;         /* Inodes count */
 317         __u32   s_blocks_count;         /* Blocks count */
 318         __u32   s_r_blocks_count;       /* Reserved blocks count */
 319         __u32   s_free_blocks_count;    /* Free blocks count */
 320         __u32   s_free_inodes_count;    /* Free inodes count */
 321         __u32   s_first_data_block;     /* First Data Block */
 322         __u32   s_log_block_size;       /* Block size */
 323         __s32   s_log_frag_size;        /* Fragment size */
 324         __u32   s_blocks_per_group;     /* # Blocks per group */
 325         __u32   s_frags_per_group;      /* # Fragments per group */
 326         __u32   s_inodes_per_group;     /* # Inodes per group */
 327         __u32   s_mtime;                /* Mount time */
 328         __u32   s_wtime;                /* Write time */
 329         __u16   s_mnt_count;            /* Mount count */
 330         __s16   s_max_mnt_count;        /* Maximal mount count */
 331         __u16   s_magic;                /* Magic signature */
 332         __u16   s_state;                /* File system state */
 333         __u16   s_errors;               /* Behaviour when detecting errors */
 334         __u16   s_minor_rev_level;      /* minor revision level */
 335         __u32   s_lastcheck;            /* time of last check */
 336         __u32   s_checkinterval;        /* max. time between checks */
 337         __u32   s_creator_os;           /* OS */
 338         __u32   s_rev_level;            /* Revision level */
 339         __u16   s_def_resuid;           /* Default uid for reserved blocks */
 340         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 341         /*
 342          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 343          *
 344          * Note: the difference between the compatible feature set and
 345          * the incompatible feature set is that if there is a bit set
 346          * in the incompatible feature set that the kernel doesn't
 347          * know about, it should refuse to mount the filesystem.
 348          *
 349          * e2fsck's requirements are more strict; if it doesn't know
 350          * about a feature in either the compatible or incompatible
 351          * feature set, it must abort and not try to meddle with
 352          * things it doesn't understand...
 353          */
 354         __u32   s_first_ino;            /* First non-reserved inode */
 355         __u16   s_inode_size;           /* size of inode structure */
 356         __u16   s_block_group_nr;       /* block group # of this superblock */
 357         __u32   s_feature_compat;       /* compatible feature set */
 358         __u32   s_feature_incompat;     /* incompatible feature set */
 359         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 360         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 361         char    s_volume_name[16];      /* volume name */
 362         char    s_last_mounted[64];     /* directory where last mounted */
 363         __u32   s_algorithm_usage_bitmap; /* For compression */
 364         /*
 365          * Performance hints.  Directory preallocation should only
 366          * happen if the EXT2_COMPAT_PREALLOC flag is on.
 367          */
 368         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 369         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 370         __u16   s_padding1;
 371         __u32   s_reserved[204];        /* Padding to the end of the block */
 372 };
 373
 374 /* Assume that user mode programs are passing in an ext2fs superblock, not
 375  * a kernel struct super_block.  This will allow us to call the feature-test
 376  * macros from user land. */
 377 #define EXT2_SB(sb)     (sb)
 378
 379 /*
 380  * Codes for operating systems
 381  */
 382 #define EXT2_OS_LINUX           0
 383 #define EXT2_OS_HURD            1
 384 #define EXT2_OS_MASIX           2
 385 #define EXT2_OS_FREEBSD         3
 386 #define EXT2_OS_LITES           4
 387
 388 /*
 389  * Revision levels
 390  */
 391 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 392 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 393
 394 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 395 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 396
 397 #define EXT2_GOOD_OLD_INODE_SIZE 128
 398
 399 /*
 400  * Feature set definitions
 401  */
 402
 403 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 404         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 405 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 406         ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 407 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 408         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 409 #define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
 410         EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 411 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 412         EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 413 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
 414         EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 415 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 416         EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 417 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 418         EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 419 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 420         EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 421
 422 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 423 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 424 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 425 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 426 #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
 427 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 428 #define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
 429
 430 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 431 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 432 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 433 #define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
 434
 435 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 436 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 437 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
 438 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
 439 #define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
 440
 441 #define EXT2_FEATURE_COMPAT_SUPP        0
 442 #define EXT2_FEATURE_INCOMPAT_SUPP      EXT2_FEATURE_INCOMPAT_FILETYPE
 443 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 444                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 445                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 446 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
 447 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
 448
 449 /*
 450  * Default values for user and/or group using reserved blocks
 451  */
 452 #define EXT2_DEF_RESUID         0
 453 #define EXT2_DEF_RESGID         0
 454
 455 /*
 456  * Structure of a directory entry
 457  */
 458 #define EXT2_NAME_LEN 255
 459
 460 struct ext2_dir_entry {
 461         __u32   inode;                  /* Inode number */
 462         __u16   rec_len;                /* Directory entry length */
 463         __u16   name_len;               /* Name length */
 464         char    name[EXT2_NAME_LEN];    /* File name */
 465 };
 466
 467 /*
 468  * The new version of the directory entry.  Since EXT2 structures are
 469  * stored in intel byte order, and the name_len field could never be
 470  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 471  * file_type field.
 472  */
 473 struct ext2_dir_entry_2 {
 474         __u32   inode;                  /* Inode number */
 475         __u16   rec_len;                /* Directory entry length */
 476         __u8    name_len;               /* Name length */
 477         __u8    file_type;
 478         char    name[EXT2_NAME_LEN];    /* File name */
 479 };
 480
 481 /*
 482  * Ext2 directory file types.  Only the low 3 bits are used.  The
 483  * other bits are reserved for now.
 484  */
 485 enum {
 486         EXT2_FT_UNKNOWN,
 487         EXT2_FT_REG_FILE,
 488         EXT2_FT_DIR,
 489         EXT2_FT_CHRDEV,
 490         EXT2_FT_BLKDEV,
 491         EXT2_FT_FIFO,
 492         EXT2_FT_SOCK,
 493         EXT2_FT_SYMLINK,
 494         EXT2_FT_MAX
 495 };
 496
 497 /*
 498  * EXT2_DIR_PAD defines the directory entries boundaries
 499  *
 500  * NOTE: It must be a multiple of 4
 501  */
 502 #define EXT2_DIR_PAD                    4
 503 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 504 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 505                                          ~EXT2_DIR_ROUND)
 506
 507
 508 #endif  /* _LINUX_EXT2_FS_H */