1 files changed, 86 insertions, 0 deletions
diff --git a/src/common/subsys_types.h b/src/common/subsys_types.h
new file mode 100644
index 000000000..52171809b
--- /dev/null
+++ b/src/common/subsys_types.h
@@ -0,0 +1,86 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2018 Red Hat Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_SUBSYS_TYPES_H
+#define CEPH_SUBSYS_TYPES_H
+
+#include <algorithm>
+#include <array>
+
+enum ceph_subsys_id_t {
+  ceph_subsys_,   // default
+#define SUBSYS(name, log, gather) \
+  ceph_subsys_##name,
+#define DEFAULT_SUBSYS(log, gather)
+#include "common/subsys.h"
+#undef SUBSYS
+#undef DEFAULT_SUBSYS
+  ceph_subsys_max
+};
+
+constexpr static std::size_t ceph_subsys_get_num() {
+  return static_cast<std::size_t>(ceph_subsys_max);
+}
+
+struct ceph_subsys_item_t {
+  const char* name;
+  uint8_t log_level;
+  uint8_t gather_level;
+};
+
+constexpr static std::array<ceph_subsys_item_t, ceph_subsys_get_num()>
+ceph_subsys_get_as_array() {
+#define SUBSYS(name, log, gather) \
+  ceph_subsys_item_t{ #name, log, gather },
+#define DEFAULT_SUBSYS(log, gather) \
+  ceph_subsys_item_t{ "none", log, gather },
+
+  return {
+#include "common/subsys.h"
+  };
+#undef SUBSYS
+#undef DEFAULT_SUBSYS
+}
+
+constexpr static std::uint8_t
+ceph_subsys_get_max_default_level(const std::size_t subidx) {
+  const auto item = ceph_subsys_get_as_array()[subidx];
+  return std::max(item.log_level, item.gather_level);
+}
+
+// Compile time-capable version of std::strlen. Resorting to own
+// implementation only because C++17 doesn't mandate constexpr
+// on the standard one.
+constexpr static std::size_t strlen_ct(const char* const s) {
+  std::size_t l = 0;
+  while (s[l] != '\0') {
+    ++l;
+  }
+  return l;
+}
+
+constexpr static std::size_t ceph_subsys_max_name_length() {
+  return std::max({
+#define SUBSYS(name, log, gather) \
+  strlen_ct(#name),
+#define DEFAULT_SUBSYS(log, gather) \
+  strlen_ct("none"),
+#include "common/subsys.h"
+#undef SUBSYS
+#undef DEFAULT_SUBSYS
+  });
+}
+
+#endif // CEPH_SUBSYS_TYPES_H
+