A simple derivative of the Unix FFS file system. I used the FUSE toolkit in Linux to implement the file system as a user-space process; instead of a physical disk I will use a data file accessed through a block device interface specified at the end of this file. (the blkdev pointer can be found in the global variable 'disk').
File System Format:
+-------------+--------------+--------------+---------+-------------+
| SUPER BLOCK | INODE BITMAP | BLOCK BITMAP | INODES | DATA BLOCKS |
+-------------+--------------+--------------+---------+-------------+
Inode Structure:
+----------------------+-----------+
| Description | Usage |
+----------------------+-----------+
| File Owner | uid |
| | |
| Group | gid |
| | |
| Permissions and type | mode |
| | |
| TimeStamps | ctime |
| | mtime |
| | |
| Size of file | size |
| | |
| 6 blocks in file | direct[6] |
| | |
| indirect pointer 1 | indir_1 |
| | |
| indirect pointer 2 | indir_2 |
+----------------------+-----------+
Directories:
+-------------+----------+
| Description | Size |
+-------------+----------+
| valid | 1-bit |
| | |
| isDir | 1-bit |
| | |
| inode | 30-bits |
| | |
| name | 28-bytes |
+-------------+----------+
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