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+; -----------------------------------------------------------------------
+;
+; Copyright 1998-2008 H. Peter Anvin - All Rights Reserved
+;
+; This program is free software; you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
+; USA; either version 2 of the License, or (at your option) any later
+; version; incorporated herein by reference.
+;
+; -----------------------------------------------------------------------
+
+;
+; ext2_fs.inc
+;
+; NASM include file for ext2fs data structures
+;
+
+%define EXT2_SUPER_MAGIC 0xEF53
+
+%define EXT2_GOOD_OLD_REV 0 ; The good old (original) format
+%define EXT2_DYNAMIC_REV 1 ; V2 format w/ dynamic inode sizes
+%define EXT2_GOOD_OLD_INODE_SIZE 128
+
+; Special inode numbers
+%define EXT2_BAD_INO 1 ; Bad blocks inode
+%define EXT2_ROOT_INO 2 ; Root inode
+%define EXT2_BOOT_LOADER_INO 5 ; Boot loader inode
+%define EXT2_UNDEL_DIR_INO 6 ; Undelete directory inode
+%define EXT3_RESIZE_INO 7 ; Reserved group descriptors inode
+%define EXT3_JOURNAL_INO 8 ; Journal inode
+
+; We're readonly, so we only care about incompat features.
+%define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
+%define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
+%define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
+%define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
+%define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
+%define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
+
+%define EXT2_NDIR_BLOCKS 12
+%define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
+%define EXT2_DIND_BLOCK (EXT2_IND_BLOCK+1)
+%define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK+1)
+%define EXT2_N_BLOCKS (EXT2_TIND_BLOCK+1)
+
+;
+; File types and file modes
+;
+%define S_IFDIR 0040000o ; Directory
+%define S_IFCHR 0020000o ; Character device
+%define S_IFBLK 0060000o ; Block device
+%define S_IFREG 0100000o ; Regular file
+%define S_IFIFO 0010000o ; FIFO
+%define S_IFLNK 0120000o ; Symbolic link
+%define S_IFSOCK 0140000o ; Socket
+
+%define S_IFSHIFT 12
+
+%define T_IFDIR (S_IFDIR >> S_IFSHIFT)
+%define T_IFCHR (S_IFCHR >> S_IFSHIFT)
+%define T_IFBLK (S_IFBLK >> S_IFSHIFT)
+%define T_IFREG (S_IFREG >> S_IFSHIFT)
+%define T_IFIFO (S_IFIFO >> S_IFSHIFT)
+%define T_IFLNK (S_IFLNK >> S_IFSHIFT)
+%define T_IFSOCK (S_IFSOCK >> S_IFSHIFT)
+
+;
+; Structure definition for the ext2 superblock
+;
+ struc ext2_super_block
+s_inodes_count resd 1 ; Inodes count
+s_blocks_count resd 1 ; Blocks count
+s_r_blocks_count resd 1 ; Reserved blocks count
+s_free_blocks_count resd 1 ; Free blocks count
+s_free_inodes_count resd 1 ; Free inodes count
+s_first_data_block resd 1 ; First Data Block
+s_log_block_size resd 1 ; Block size
+s_log_frag_size resd 1 ; Fragment size
+s_blocks_per_group resd 1 ; # Blocks per group
+s_frags_per_group resd 1 ; # Fragments per group
+s_inodes_per_group resd 1 ; # Inodes per group
+s_mtime resd 1 ; Mount time
+s_wtime resd 1 ; Write time
+s_mnt_count resw 1 ; Mount count
+s_max_mnt_count resw 1 ; Maximal mount count
+s_magic resw 1 ; Magic signature
+s_state resw 1 ; File system state
+s_errors resw 1 ; Behaviour when detecting errors
+s_minor_rev_level resw 1 ; minor revision level
+s_lastcheck resd 1 ; time of last check
+s_checkinterval resd 1 ; max. time between checks
+s_creator_os resd 1 ; OS
+s_rev_level resd 1 ; Revision level
+s_def_resuid resw 1 ; Default uid for reserved blocks
+s_def_resgid resw 1 ; Default gid for reserved blocks
+s_first_ino resd 1 ; First non-reserved inode
+s_inode_size resw 1 ; size of inode structure
+s_block_group_nr resw 1 ; block group # of this superblock
+s_feature_compat resd 1 ; compatible feature set
+s_feature_incompat resd 1 ; incompatible feature set
+s_feature_ro_compat resd 1 ; readonly-compatible feature set
+s_uuid resb 16 ; 128-bit uuid for volume
+s_volume_name resb 16 ; volume name
+s_last_mounted resb 64 ; directory where last mounted
+s_algorithm_usage_bitmap resd 1 ; For compression
+s_prealloc_blocks resb 1 ; Nr of blocks to try to preallocate
+s_prealloc_dir_blocks resb 1 ; Nr to preallocate for dirs
+s_padding1 resw 1
+s_reserved resd 204 ; Padding to the end of the block
+ endstruc
+
+%ifndef DEPEND
+%if ext2_super_block_size != 1024
+%error "ext2_super_block definition bogus"
+%endif
+%endif
+
+;
+; Structure definition for the ext2 inode
+;
+ struc ext2_inode
+i_mode resw 1 ; File mode
+i_uid resw 1 ; Owner Uid
+i_size resd 1 ; Size in bytes
+i_atime resd 1 ; Access time
+i_ctime resd 1 ; Creation time
+i_mtime resd 1 ; Modification time
+i_dtime resd 1 ; Deletion Time
+i_gid resw 1 ; Group Id
+i_links_count resw 1 ; Links count
+i_blocks resd 1 ; Blocks count
+i_flags resd 1 ; File flags
+l_i_reserved1 resd 1
+i_block resd EXT2_N_BLOCKS ; Pointer to blocks
+i_version resd 1 ; File version (for NFS)
+i_file_acl resd 1 ; File ACL
+i_dir_acl resd 1 ; Directory ACL
+i_faddr resd 1 ; Fragment address
+l_i_frag resb 1 ; Fragment number
+l_i_fsize resb 1 ; Fragment size
+i_pad1 resw 1
+l_i_reserved2 resd 2
+ endstruc
+
+%ifndef DEPEND
+%if ext2_inode_size != 128
+%error "ext2_inode definition bogus"
+%endif
+%endif
+
+;
+; Structure definition for ext2 block group descriptor
+;
+ struc ext2_group_desc
+bg_block_bitmap resd 1 ; Block bitmap block
+bg_inode_bitmap resd 1 ; Inode bitmap block
+bg_inode_table resd 1 ; Inode table block
+bg_free_blocks_count resw 1 ; Free blocks count
+bg_free_inodes_count resw 1 ; Free inodes count
+bg_used_dirs_count resw 1 ; Used inodes count
+bg_pad resw 1
+bg_reserved resd 3
+ endstruc
+
+%ifndef DEPEND
+%if ext2_group_desc_size != 32
+%error "ext2_group_desc definition bogus"
+%endif
+%endif
+
+%define ext2_group_desc_lg2size 5
+
+;
+; Structure definition for ext2 directory entry
+;
+ struc ext2_dir_entry
+d_inode resd 1 ; Inode number
+d_rec_len resw 1 ; Directory entry length
+d_name_len resb 1 ; Name length
+d_file_type resb 1 ; File type
+d_name equ $
+ endstruc