//! No-op writeback pipeline for non-Linux targets. macOS and Windows
//! page cache policies have not been shown to exhibit the Linux
//! accumulate-then-burst flush pathology for our access pattern.
//! If that changes, replace this stub with a real implementation
//! (e.g. `F_NOCACHE` on macOS, `FILE_FLAG_WRITE_THROUGH` on Windows).
use File;
pub ;