ext2_fs.inc

   1 ; -----------------------------------------------------------------------
   2 ;
   3 ;   Copyright 1998-2008 H. Peter Anvin - All Rights Reserved
   4 ;
   5 ;   This program is free software; you can redistribute it and/or modify
   6 ;   it under the terms of the GNU General Public License as published by
   7 ;   the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
   8 ;   USA; either version 2 of the License, or (at your option) any later
   9 ;   version; incorporated herein by reference.
  10 ;
  11 ; -----------------------------------------------------------------------
  12
  13 ;
  14 ; ext2_fs.inc
  15 ;
  16 ; NASM include file for ext2fs data structures
  17 ;
  18
  19 %define EXT2_SUPER_MAGIC        0xEF53
  20
  21 %define EXT2_GOOD_OLD_REV       0       ; The good old (original) format
  22 %define EXT2_DYNAMIC_REV        1       ; V2 format w/ dynamic inode sizes
  23 %define EXT2_GOOD_OLD_INODE_SIZE 128
  24
  25 ; Special inode numbers
  26 %define EXT2_BAD_INO             1      ; Bad blocks inode
  27 %define EXT2_ROOT_INO            2      ; Root inode
  28 %define EXT2_BOOT_LOADER_INO     5      ; Boot loader inode
  29 %define EXT2_UNDEL_DIR_INO       6      ; Undelete directory inode
  30 %define EXT3_RESIZE_INO          7      ; Reserved group descriptors inode
  31 %define EXT3_JOURNAL_INO         8      ; Journal inode
  32
  33 ; We're readonly, so we only care about incompat features.
  34 %define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
  35 %define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
  36 %define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
  37 %define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
  38 %define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
  39 %define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
  40
  41 %define EXT2_NDIR_BLOCKS        12
  42 %define EXT2_IND_BLOCK          EXT2_NDIR_BLOCKS
  43 %define EXT2_DIND_BLOCK         (EXT2_IND_BLOCK+1)
  44 %define EXT2_TIND_BLOCK         (EXT2_DIND_BLOCK+1)
  45 %define EXT2_N_BLOCKS           (EXT2_TIND_BLOCK+1)
  46
  47 ;
  48 ; File types and file modes
  49 ;
  50 %define S_IFDIR         0040000o        ; Directory
  51 %define S_IFCHR         0020000o        ; Character device
  52 %define S_IFBLK         0060000o        ; Block device
  53 %define S_IFREG         0100000o        ; Regular file
  54 %define S_IFIFO         0010000o        ; FIFO
  55 %define S_IFLNK         0120000o        ; Symbolic link
  56 %define S_IFSOCK        0140000o        ; Socket
  57
  58 %define S_IFSHIFT       12
  59
  60 %define T_IFDIR         (S_IFDIR >> S_IFSHIFT)
  61 %define T_IFCHR         (S_IFCHR >> S_IFSHIFT)
  62 %define T_IFBLK         (S_IFBLK >> S_IFSHIFT)
  63 %define T_IFREG         (S_IFREG >> S_IFSHIFT)
  64 %define T_IFIFO         (S_IFIFO >> S_IFSHIFT)
  65 %define T_IFLNK         (S_IFLNK >> S_IFSHIFT)
  66 %define T_IFSOCK        (S_IFSOCK >> S_IFSHIFT)
  67
  68 ;
  69 ; Structure definition for the ext2 superblock
  70 ;
  71                         struc ext2_super_block
  72 s_inodes_count          resd 1                  ; Inodes count
  73 s_blocks_count          resd 1                  ; Blocks count
  74 s_r_blocks_count        resd 1                  ; Reserved blocks count
  75 s_free_blocks_count     resd 1                  ; Free blocks count
  76 s_free_inodes_count     resd 1                  ; Free inodes count
  77 s_first_data_block      resd 1                  ; First Data Block
  78 s_log_block_size        resd 1                  ; Block size
  79 s_log_frag_size         resd 1                  ; Fragment size
  80 s_blocks_per_group      resd 1                  ; # Blocks per group
  81 s_frags_per_group       resd 1                  ; # Fragments per group
  82 s_inodes_per_group      resd 1                  ; # Inodes per group
  83 s_mtime                 resd 1                  ; Mount time
  84 s_wtime                 resd 1                  ; Write time
  85 s_mnt_count             resw 1                  ; Mount count
  86 s_max_mnt_count         resw 1                  ; Maximal mount count
  87 s_magic                 resw 1                  ; Magic signature
  88 s_state                 resw 1                  ; File system state
  89 s_errors                resw 1                  ; Behaviour when detecting errors
  90 s_minor_rev_level       resw 1                  ; minor revision level
  91 s_lastcheck             resd 1                  ; time of last check
  92 s_checkinterval         resd 1                  ; max. time between checks
  93 s_creator_os            resd 1                  ; OS
  94 s_rev_level             resd 1                  ; Revision level
  95 s_def_resuid            resw 1                  ; Default uid for reserved blocks
  96 s_def_resgid            resw 1                  ; Default gid for reserved blocks
  97 s_first_ino             resd 1                  ; First non-reserved inode
  98 s_inode_size            resw 1                  ; size of inode structure
  99 s_block_group_nr        resw 1                  ; block group # of this superblock
 100 s_feature_compat        resd 1                  ; compatible feature set
 101 s_feature_incompat      resd 1                  ; incompatible feature set
 102 s_feature_ro_compat     resd 1                  ; readonly-compatible feature set
 103 s_uuid                  resb 16                 ; 128-bit uuid for volume
 104 s_volume_name           resb 16                 ; volume name
 105 s_last_mounted          resb 64                 ; directory where last mounted
 106 s_algorithm_usage_bitmap resd 1                 ; For compression
 107 s_prealloc_blocks       resb 1                  ; Nr of blocks to try to preallocate
 108 s_prealloc_dir_blocks   resb 1                  ; Nr to preallocate for dirs
 109 s_padding1              resw 1
 110 s_reserved              resd 204                ; Padding to the end of the block
 111                         endstruc
 112
 113 %ifndef DEPEND
 114 %if ext2_super_block_size != 1024
 115 %error "ext2_super_block definition bogus"
 116 %endif
 117 %endif
 118
 119 ;
 120 ; Structure definition for the ext2 inode
 121 ;
 122                         struc ext2_inode
 123 i_mode                  resw 1                  ; File mode
 124 i_uid                   resw 1                  ; Owner Uid
 125 i_size                  resd 1                  ; Size in bytes
 126 i_atime                 resd 1                  ; Access time
 127 i_ctime                 resd 1                  ; Creation time
 128 i_mtime                 resd 1                  ; Modification time
 129 i_dtime                 resd 1                  ; Deletion Time
 130 i_gid                   resw 1                  ; Group Id
 131 i_links_count           resw 1                  ; Links count
 132 i_blocks                resd 1                  ; Blocks count
 133 i_flags                 resd 1                  ; File flags
 134 l_i_reserved1           resd 1
 135 i_block                 resd EXT2_N_BLOCKS      ; Pointer to blocks
 136 i_version               resd 1                  ; File version (for NFS)
 137 i_file_acl              resd 1                  ; File ACL
 138 i_dir_acl               resd 1                  ; Directory ACL
 139 i_faddr                 resd 1                  ; Fragment address
 140 l_i_frag                resb 1                  ; Fragment number
 141 l_i_fsize               resb 1                  ; Fragment size
 142 i_pad1                  resw 1
 143 l_i_reserved2           resd 2
 144                         endstruc
 145
 146 %ifndef DEPEND
 147 %if ext2_inode_size != 128
 148 %error "ext2_inode definition bogus"
 149 %endif
 150 %endif
 151
 152 ;
 153 ; Structure definition for ext2 block group descriptor
 154 ;
 155                         struc ext2_group_desc
 156 bg_block_bitmap         resd 1                  ; Block bitmap block
 157 bg_inode_bitmap         resd 1                  ; Inode bitmap block
 158 bg_inode_table          resd 1                  ; Inode table block
 159 bg_free_blocks_count    resw 1                  ; Free blocks count
 160 bg_free_inodes_count    resw 1                  ; Free inodes count
 161 bg_used_dirs_count      resw 1                  ; Used inodes count
 162 bg_pad                  resw 1
 163 bg_reserved             resd 3
 164                         endstruc
 165
 166 %ifndef DEPEND
 167 %if ext2_group_desc_size != 32
 168 %error "ext2_group_desc definition bogus"
 169 %endif
 170 %endif
 171
 172 %define ext2_group_desc_lg2size 5
 173
 174 ;
 175 ; Structure definition for ext2 directory entry
 176 ;
 177                         struc ext2_dir_entry
 178 d_inode                 resd 1                  ; Inode number
 179 d_rec_len               resw 1                  ; Directory entry length
 180 d_name_len              resb 1                  ; Name length
 181 d_file_type             resb 1                  ; File type
 182 d_name                  equ $
 183                         endstruc