1 files changed, 27 insertions, 0 deletions
diff --git a/src/crimson/os/seastore/backref_mapping.h b/src/crimson/os/seastore/backref_mapping.h
new file mode 100644
index 00000000000..d0a6a0ea6ff
--- /dev/null
+++ b/src/crimson/os/seastore/backref_mapping.h
@@ -0,0 +1,27 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include "crimson/os/seastore/btree/btree_range_pin.h"
+
+namespace crimson::os::seastore {
+
+class BackrefMapping : public BtreeNodeMapping<paddr_t, laddr_t> {
+  extent_types_t type;
+public:
+  BackrefMapping(op_context_t<paddr_t> ctx)
+    : BtreeNodeMapping(ctx) {}
+  template <typename... T>
+  BackrefMapping(extent_types_t type, T&&... t)
+    : BtreeNodeMapping(std::forward<T>(t)...),
+      type(type) {}
+  extent_types_t get_type() const {
+    return type;
+  }
+};
+
+using BackrefMappingRef = std::unique_ptr<BackrefMapping>;
+using backref_pin_list_t = std::list<BackrefMappingRef>;
+
+} // namespace crimson::os::seastore