ashtfs

A file system for virtual machines.

Disk Layout

The disk can be compared to a flat array of blocks. Each block has the following parts:

4KB size block:

[ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ]
  ^ ^ ^ ^^^^^ ^^^^^^^^^^^^^^^^^
  a b c   d           e

• a (int): The 0th bit, or the index bit, stores the index of the current block.
• b (int): stores unix time timestamp of creation time
• c (int): pointer to the next extending block.
• d (int): this stores the length of the name of the file or directory allocated to that block.
• e (uint8[]): This is a series of 8 bit unsigned integers, which form the actual name of the file or directory.
• f (int[]): This is the file bitmap or the actual content of the file.

Extending blocks = Blocks that store chunks of files or directories that were too large to fit in one block.
Pointers = An integer that represents the beginning index of blocks in the file system.