Function release_file_cache 

pub fn release_file_cache(
    file: &File,
    offset: u64,
    bytes: u64,
) -> Result<FileCacheReleaseOutcome>

Release one clean file range from the operating-system page cache.

Callers writing the file must synchronize the range before calling this primitive. Prefer DurableFileCacheWriter for write paths because it structurally enforces synchronization before release.

Errors

Returns an error when a supported operating-system release request fails.