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Diffstat (limited to 'core/ext2_fs.inc')
| -rw-r--r-- | core/ext2_fs.inc | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/core/ext2_fs.inc b/core/ext2_fs.inc new file mode 100644 index 00000000..e84efb14 --- /dev/null +++ b/core/ext2_fs.inc @@ -0,0 +1,183 @@ +; ----------------------------------------------------------------------- +; +; 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 |