A script written in Python 2 to analyze the superblock of an ext2/ext3 formatted file.
Such a file can be created as follows:
$ dd count=4096 if=/dev/zero of=filesystem.ext3 $ sudo mkfs.ext3 filesystem.ext3
It can be mounted with
$ sudo mount -t ext3 -o loop filesystem.ext3 /mnt/mountpoint
You can either download superblock.py file and use it directly, or install
the superblock command via pip:
$ sudo pip install superblock
$ superblock [dump|analyze] <filename>
MIT License, see LICENSE file.
Printing superblock (bytes 1024-1535) of file fs.ext2.
HEX ASCII
1: 40000000 00020000 19000000 e2010000 @...............
2: 32000000 01000000 00000000 00000000 2...............
3: 00200000 00200000 40000000 82bad550 . ... ..@......P
4: c4bcd550 0200ffff 53ef0100 01000000 ...P....S.......
5: 968bd550 00000000 00000000 01000000 ...P............
6: 00000000 0b000000 80000000 38000000 ............8...
7: 02000000 01000000 dc0cb51b 2ab54967 ............*.Ig
8: 8e602492 87974d10 65787065 72696d5f .`$...M.experim_
9: 65787432 00000000 2f686f6d 652f6461 ext2..../home/da
10: 6e696c6f 2f50726f 6a656374 732f7375 nilo/Projects/su
11: 70657262 6c6f636b 2f6d6e74 00000000 perblock/mnt....
12: 00000000 00000000 00000000 00000000 ................
13: 00000000 00000000 00000000 00000100 ................
14: 00000000 00000000 00000000 00000000 ................
15: 00000000 00000000 00000000 ff27f89c .............'..
16: b5cb41d1 987de848 6b3e81ba 01000000 ..A..}.Hk>......
17: 0c000000 00000000 968bd550 00000000 ...........P....
18: 00000000 00000000 00000000 00000000 ................
19: 00000000 00000000 00000000 00000000 ................
20: 00000000 00000000 00000000 00000000 ................
21: 00000000 00000000 00000000 00000000 ................
22: 00000000 00000000 00000000 00000000 ................
23: 01000000 00000000 00000000 00000000 ................
24: 00000000 00000000 00000000 00000000 ................
25: 00000000 00000000 00000000 00000000 ................
26: 00000000 00000000 00000000 00000000 ................
27: 00000000 00000000 00000000 00000000 ................
28: 00000000 00000000 00000000 00000000 ................
29: 00000000 00000000 00000000 00000000 ................
30: 00000000 00000000 00000000 00000000 ................
31: 00000000 00000000 00000000 00000000 ................
32: 00000000 00000000 00000000 00000000 ................
Analyzing superblock (bytes 1024-1535) of file fs.ext2. Total number of inodes: 64 Filesystem size in blocks: 512 Number of reserved blocks: 25 Free blocks counter: 482 Free inodes counter: 50 Number of first block: 1 Block size: 0 (1024 Byte) Fragment size: 0 Number blocks per group: 8192 Number fragments per group: 8192 Number inodes per group: 64 Number of block groups: 1 Time of last mount: 1356184194 (2012-12-22 14:49:54) Time of last write: 1356184772 (2012-12-22 14:59:32) Mount operations counter: 2 Number of mount operations before check: 65535 Magic signature: 0XEF53 Status flag: 1 Behavior when detecting errors: 1 Minor revision level: 0 Time of last check: 1356172182 (2012-12-22 11:29:42) Time between checks: 0 OS Filesystem created: 0 Revision level: 1 Default user ID for reserved blocks: 0 Default group ID for reserved blocks: 0 Number first nonreserved inode: 11 Size of on-disk inode structure: 128 Block group number of this superblock: 0 Compatible features bitmap: 111000 (ext_attr resize_ino dir_index) Incompatible features bitmap: 00010 (filetype) Read-only features bitmap: 001 (sparse_super) 128-bit filesystem identifier: dc0cb51b-2ab5-4967-8e60-249287974d10 Volume name: experim_ext2 Path of last mount point: /home/danilo/Projects/superblock/mnt Compression Algorithm: 00000 (none) Number of blocks to preallocate: 0 Number of blocks to preallocate for directories: 0 Journal UUID: 00000000-0000-0000-0000-000000000000 Journal inode number: 0 Journal device number: 0 Journal last orphan: 0 Hash seed: 2633508863 3510750133 1223196056 3129032299 Hash version: 1 Default mount options: 01100 (xattr_user acl) First meta block group ID: 0
- The Second Extended File System
- /usr/include/ext2fs/ext2_fs.h