# RedoxFS Design Document
## Structures
### Header
The header is the entry point for the filesystem. When mounting a disk or image, it should be scanned for a block starting with the 8-byte signature, within the first megabyte:
```rust
"RedoxFS\0"
```
The header stores the filesystem version, disk identifier, disk size, root block pointer, and free block pointer.
```rust
#[repr(packed)]
pub struct Header {
pub signature: [u8; 8],
pub version: u64,
pub uuid: [u8; 16],
pub size: u64,
pub root: u64,
pub free: u64,
}
```
The root and free block pointers point to a Node that identifies
### Node
```rust
#[repr(packed)]
pub struct Node {
pub name: [u8; 256],
pub mode: u64,
pub next: u64,
pub extents: [Extent; 15],
}
```