Add ability to proxy ioprio of client apps (#1534)

src/config_proxy_ioprio.cpp

@@ -0,0 +1,33 @@
+#include "config_proxy_ioprio.hpp"
+
+#include "ioprio.hpp"
+#include "from_string.hpp"
+
+
+ProxyIOPrio::ProxyIOPrio(const bool b_)
+{
+  ioprio::enable(b_);
+}
+
+std::string
+ProxyIOPrio::to_string(void) const
+{
+  if(ioprio::enabled())
+    return "true";
+  return "false";
+}
+
+int
+ProxyIOPrio::from_string(const std::string_view s_)
+{
+  int rv;
+  bool enable;
+
+  rv = str::from(s_,&enable);
+  if(rv)
+    return rv;
+
+  ioprio::enable(enable);
+
+  return 0;
+}