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(* Parse an ext3 superblock.
* $Id: ext3_superblock.ml 142 2008-07-17 15:45:56Z richard.wm.jones $
*)
open Printf
(*let () = Bitstring.debug := true*)
let bits = Bitstring.bitstring_of_file "ext3_sb"
(* The structure is straight from /usr/include/linux/ext3_fs.h *)
let () =
bitmatch bits with
| { s_inodes_count : 32 : littleendian; (* Inodes count *)
s_blocks_count : 32 : littleendian; (* Blocks count *)
s_r_blocks_count : 32 : littleendian; (* Reserved blocks count *)
s_free_blocks_count : 32 : littleendian; (* Free blocks count *)
s_free_inodes_count : 32 : littleendian; (* Free inodes count *)
s_first_data_block : 32 : littleendian; (* First Data Block *)
s_log_block_size : 32 : littleendian; (* Block size *)
s_log_frag_size : 32 : littleendian; (* Fragment size *)
s_blocks_per_group : 32 : littleendian; (* # Blocks per group *)
s_frags_per_group : 32 : littleendian; (* # Fragments per group *)
s_inodes_per_group : 32 : littleendian; (* # Inodes per group *)
s_mtime : 32 : littleendian; (* Mount time *)
s_wtime : 32 : littleendian; (* Write time *)
s_mnt_count : 16 : littleendian; (* Mount count *)
s_max_mnt_count : 16 : littleendian; (* Maximal mount count *)
0xef53 : 16 : littleendian; (* Magic signature *)
s_state : 16 : littleendian; (* File system state *)
s_errors : 16 : littleendian; (* Behaviour when detecting errors *)
s_minor_rev_level : 16 : littleendian; (* minor revision level *)
s_lastcheck : 32 : littleendian; (* time of last check *)
s_checkinterval : 32 : littleendian; (* max. time between checks *)
s_creator_os : 32 : littleendian; (* OS *)
s_rev_level : 32 : littleendian; (* Revision level *)
s_def_resuid : 16 : littleendian; (* Default uid for reserved blocks *)
s_def_resgid : 16 : littleendian; (* Default gid for reserved blocks *)
s_first_ino : 32 : littleendian; (* First non-reserved inode *)
s_inode_size : 16 : littleendian; (* size of inode structure *)
s_block_group_nr : 16 : littleendian; (* block group # of this superblock *)
s_feature_compat : 32 : littleendian; (* compatible feature set *)
s_feature_incompat : 32 : littleendian; (* incompatible feature set *)
s_feature_ro_compat : 32 : littleendian; (* readonly-compatible feature set *)
s_uuid : 128 : string; (* 128-bit uuid for volume *)
s_volume_name : 128 : string; (* volume name *)
s_last_mounted : 512 : string; (* directory where last mounted *)
s_algorithm_usage_bitmap : 32 : littleendian; (* For compression *)
s_prealloc_blocks : 8; (* Nr of blocks to try to preallocate*)
s_prealloc_dir_blocks : 8; (* Nr to preallocate for dirs *)
s_reserved_gdt_blocks : 16 : littleendian;(* Per group desc for online growth *)
s_journal_uuid : 128 : string; (* uuid of journal superblock *)
s_journal_inum : 32 : littleendian; (* inode number of journal file *)
s_journal_dev : 32 : littleendian; (* device number of journal file *)
s_last_orphan : 32 : littleendian; (* start of list of inodes to delete *)
s_hash_seed0 : 32 : littleendian; (* HTREE hash seed *)
s_hash_seed1 : 32 : littleendian;
s_hash_seed2 : 32 : littleendian;
s_hash_seed3 : 32 : littleendian;
s_def_hash_version : 8; (* Default hash version to use *)
s_reserved_char_pad : 8;
s_reserved_word_pad : 16 : littleendian;
s_default_mount_opts : 32 : littleendian;
s_first_meta_bg : 32 : littleendian; (* First metablock block group *)
_ : 6080 : bitstring } -> (* Padding to the end of the block *)
printf "ext3 superblock:\n";
printf " s_inodes_count = %ld\n" s_inodes_count;
printf " s_blocks_count = %ld\n" s_blocks_count;
printf " s_free_inodes_count = %ld\n" s_free_inodes_count;
printf " s_free_blocks_count = %ld\n" s_free_blocks_count;
printf " s_uuid = %S\n" s_uuid;
printf " s_volume_name = %S\n" s_volume_name;
printf " s_last_mounted = %S\n" s_last_mounted
| { _ } ->
eprintf "not an ext3 superblock!\n%!";
exit 2
|
