1 (* Parse an ext3 superblock.
2 * $Id: 70_ext3_sb.ml,v 1.3 2008-04-25 12:55:39 rjones Exp $
7 (*let () = Bitmatch.debug := true*)
9 let bits = Bitmatch.bitstring_of_file "ext3_sb"
11 (* The structure is straight from /usr/include/linux/ext3_fs.h *)
15 | { s_inodes_count : 32 : littleendian; (* Inodes count *)
16 s_blocks_count : 32 : littleendian; (* Blocks count *)
17 s_r_blocks_count : 32 : littleendian; (* Reserved blocks count *)
18 s_free_blocks_count : 32 : littleendian; (* Free blocks count *)
19 s_free_inodes_count : 32 : littleendian; (* Free inodes count *)
20 s_first_data_block : 32 : littleendian; (* First Data Block *)
21 s_log_block_size : 32 : littleendian; (* Block size *)
22 s_log_frag_size : 32 : littleendian; (* Fragment size *)
23 s_blocks_per_group : 32 : littleendian; (* # Blocks per group *)
24 s_frags_per_group : 32 : littleendian; (* # Fragments per group *)
25 s_inodes_per_group : 32 : littleendian; (* # Inodes per group *)
26 s_mtime : 32 : littleendian; (* Mount time *)
27 s_wtime : 32 : littleendian; (* Write time *)
28 s_mnt_count : 16 : littleendian; (* Mount count *)
29 s_max_mnt_count : 16 : littleendian; (* Maximal mount count *)
30 0xef53 : 16 : littleendian; (* Magic signature *)
31 s_state : 16 : littleendian; (* File system state *)
32 s_errors : 16 : littleendian; (* Behaviour when detecting errors *)
33 s_minor_rev_level : 16 : littleendian; (* minor revision level *)
34 s_lastcheck : 32 : littleendian; (* time of last check *)
35 s_checkinterval : 32 : littleendian; (* max. time between checks *)
36 s_creator_os : 32 : littleendian; (* OS *)
37 s_rev_level : 32 : littleendian; (* Revision level *)
38 s_def_resuid : 16 : littleendian; (* Default uid for reserved blocks *)
39 s_def_resgid : 16 : littleendian; (* Default gid for reserved blocks *)
40 s_first_ino : 32 : littleendian; (* First non-reserved inode *)
41 s_inode_size : 16 : littleendian; (* size of inode structure *)
42 s_block_group_nr : 16 : littleendian; (* block group # of this superblock *)
43 s_feature_compat : 32 : littleendian; (* compatible feature set *)
44 s_feature_incompat : 32 : littleendian; (* incompatible feature set *)
45 s_feature_ro_compat : 32 : littleendian; (* readonly-compatible feature set *)
46 s_uuid : 128 : string; (* 128-bit uuid for volume *)
47 s_volume_name : 128 : string; (* volume name *)
48 s_last_mounted : 512 : string; (* directory where last mounted *)
49 s_algorithm_usage_bitmap : 32 : littleendian; (* For compression *)
50 s_prealloc_blocks : 8; (* Nr of blocks to try to preallocate*)
51 s_prealloc_dir_blocks : 8; (* Nr to preallocate for dirs *)
52 s_reserved_gdt_blocks : 16 : littleendian;(* Per group desc for online growth *)
53 s_journal_uuid : 128 : string; (* uuid of journal superblock *)
54 s_journal_inum : 32 : littleendian; (* inode number of journal file *)
55 s_journal_dev : 32 : littleendian; (* device number of journal file *)
56 s_last_orphan : 32 : littleendian; (* start of list of inodes to delete *)
57 s_hash_seed0 : 32 : littleendian; (* HTREE hash seed *)
58 s_hash_seed1 : 32 : littleendian;
59 s_hash_seed2 : 32 : littleendian;
60 s_hash_seed3 : 32 : littleendian;
61 s_def_hash_version : 8; (* Default hash version to use *)
62 s_reserved_char_pad : 8;
63 s_reserved_word_pad : 16 : littleendian;
64 s_default_mount_opts : 32 : littleendian;
65 s_first_meta_bg : 32 : littleendian; (* First metablock block group *)
66 _ : 6080 : bitstring } -> (* Padding to the end of the block *)
68 printf "ext3 superblock:\n";
69 printf " s_inodes_count = %ld\n" s_inodes_count;
70 printf " s_blocks_count = %ld\n" s_blocks_count;
71 printf " s_free_inodes_count = %ld\n" s_free_inodes_count;
72 printf " s_free_blocks_count = %ld\n" s_free_blocks_count;
73 printf " s_uuid = %S\n" s_uuid;
74 printf " s_volume_name = %S\n" s_volume_name;
75 printf " s_last_mounted = %S\n" s_last_mounted
78 eprintf "not an ext3 superblock!\n%!";