1 files changed, 63 insertions, 0 deletions
diff --git a/src/crimson/os/cyan_store.h b/src/crimson/os/cyan_store.h
new file mode 100644
index 00000000..0b7f3d87
--- /dev/null
+++ b/src/crimson/os/cyan_store.h
@@ -0,0 +1,63 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include <string>
+#include <unordered_map>
+#include <map>
+#include <vector>
+#include <seastar/core/future.hh>
+#include "osd/osd_types.h"
+#include "include/uuid.h"
+
+namespace ceph::os {
+
+class Collection;
+class Transaction;
+
+// a just-enough store for reading/writing the superblock
+class CyanStore {
+  using CollectionRef = boost::intrusive_ptr<Collection>;
+  const std::string path;
+  std::unordered_map<coll_t, CollectionRef> coll_map;
+  std::map<coll_t,CollectionRef> new_coll_map;
+  uint64_t used_bytes = 0;
+
+public:
+  CyanStore(const std::string& path);
+  ~CyanStore();
+
+  seastar::future<> mount();
+  seastar::future<> umount();
+
+  seastar::future<> mkfs(uuid_d osd_fsid);
+  seastar::future<bufferlist> read(CollectionRef c,
+				   const ghobject_t& oid,
+				   uint64_t offset,
+				   size_t len,
+				   uint32_t op_flags = 0);
+  using omap_values_t = std::map<std::string,bufferlist, std::less<>>;
+  seastar::future<omap_values_t> omap_get_values(
+    CollectionRef c,
+    const ghobject_t& oid,
+    std::vector<std::string>&& keys);
+  CollectionRef create_new_collection(const coll_t& cid);
+  CollectionRef open_collection(const coll_t& cid);
+  std::vector<coll_t> list_collections();
+
+  seastar::future<> do_transaction(CollectionRef ch,
+				   Transaction&& txn);
+
+  void write_meta(const std::string& key,
+		  const std::string& value);
+  int read_meta(const std::string& key, std::string* value);
+
+private:
+  int _write(const coll_t& cid, const ghobject_t& oid,
+	     uint64_t offset, size_t len, const bufferlist& bl,
+	     uint32_t fadvise_flags);
+  int _create_collection(const coll_t& cid, int bits);
+};
+
+}