Module capabilities 

Filesystem capability probing and copy tier selection. probe_capabilities(), copy tier selection, CopyCapabilities.

Structs

Capabilities

Filesystem and hardware capabilities detected by probe_capabilities

Functions

probe_cachestat

Probe whether cachestat(2) is available on this kernel. Result is cached via OnceLock – probes once per process.

probe_capabilities

Detect filesystem and hardware capabilities for a path (cached per mount point)

query_cache_residency

Query page cache residency for an open file via cachestat(2). Returns fraction of pages in cache (0.0-1.0), or None if unavailable.