add: mutex_unlock(&ref->cache->lock);
context: file_cache_invalidate_file_map(void *_cacheRef, off_t offset, off_t size){	file_cache_ref *ref = (file_cache_ref *)_cacheRef;	// ToDo: honour offset/size parameters	TRACE(("file_cache_invalidate_file_map(offset = %Ld, size = %Ld)\n", offset, size));	ref->map.Free();	return B_OK;}