#[derive(Debug, PartialEq)]
pub enum BFSErr {
    DeviceErr,    // The underlying block device had an error.
    NotFound,     // The resource was not found.
    CleanRead,    // Tried to read a byte that had never been written.
    DirtyWrite,   // Tried to write a byte that had already been written.
    OutOfBounds,  // Tried to read off the end of the device.
    BadOverwrite, // Tried to change a bit from 0->1 without an erase.
    BadErase,     // Tried to erase a clean block
    Corrupt,      // Something was corrupt...
    Full,         // No free blocks left.
    Duplicate,    // Tried to add a blob that already existed.
    InvalidArg,   // Bad argument passed to API
}