Module disk 

Disk-space measurement and eviction-candidate selection.

This module is the single source of truth for two questions:

1. How much free space is left on each partition that hosts node data?
2. Which node should be evicted next to reclaim space?

Both the low-disk eviction monitor (which actually evicts) and the fleet health layer (which warns the user before an eviction and names the candidate) call into here, so they can never disagree about who is next.

Nodes that live on the same filesystem partition share its free space, so eviction is always decided per partition: evicting one node frees space for every other node on that partition.

Structs

NodeDiskUsage

Measured disk usage of a single node’s data directory.

PartitionKey

Opaque identifier for the filesystem partition a path lives on.

PartitionState

State of one partition that hosts node data: how much space is free and which running nodes live on it (with their measured sizes).

Functions

available_space

Free bytes on the partition hosting path (or its nearest existing ancestor).

dir_size

Recursively sum the allocated disk usage of every regular file under path.

partition_states

Group the given running nodes by partition, measuring each node’s data-directory size and each partition’s free space.