Enum NextStep 

pub enum NextStep {
    Leaf(u32),
    Inner(u32),
}

One step of the descent. Caller supplies the current node block and gets back the next logical block to read (within the directory file).

Returns:

• Ok(NextStep::Leaf(block)) if the descent has reached a leaf and the caller should now linearly scan that block for the name.
• Ok(NextStep::Inner(block)) if there’s another intermediate level.

Variants

Leaf(u32)

block is the logical block index of a leaf containing dir entries.

Inner(u32)

block is the logical block index of another intermediate dx_node.