1 files changed, 61 insertions, 0 deletions
diff --git a/src/crimson/osd/replicated_backend.h b/src/crimson/osd/replicated_backend.h
new file mode 100644
index 000000000..f789a35ea
--- /dev/null
+++ b/src/crimson/osd/replicated_backend.h
@@ -0,0 +1,61 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#pragma once
+
+#include <boost/intrusive_ptr.hpp>
+#include <seastar/core/future.hh>
+#include <seastar/core/weak_ptr.hh>
+#include "include/buffer_fwd.h"
+#include "osd/osd_types.h"
+
+#include "acked_peers.h"
+#include "pg_backend.h"
+
+namespace crimson::osd {
+  class ShardServices;
+}
+
+class ReplicatedBackend : public PGBackend
+{
+public:
+  ReplicatedBackend(pg_t pgid, pg_shard_t whoami,
+		    CollectionRef coll,
+		    crimson::osd::ShardServices& shard_services,
+		    DoutPrefixProvider &dpp);
+  void got_rep_op_reply(const MOSDRepOpReply& reply) final;
+  seastar::future<> stop() final;
+  void on_actingset_changed(bool same_primary) final;
+private:
+  ll_read_ierrorator::future<ceph::bufferlist>
+    _read(const hobject_t& hoid, uint64_t off,
+	  uint64_t len, uint32_t flags) override;
+  rep_op_fut_t _submit_transaction(std::set<pg_shard_t>&& pg_shards,
+    const hobject_t& hoid,
+    ceph::os::Transaction&& txn,
+    osd_op_params_t&& osd_op_p,
+    epoch_t min_epoch, epoch_t max_epoch,
+    std::vector<pg_log_entry_t>&& log_entries) final;
+  const pg_t pgid;
+  const pg_shard_t whoami;
+  class pending_on_t : public seastar::weakly_referencable<pending_on_t> {
+  public:
+    pending_on_t(size_t pending, const eversion_t& at_version)
+      : pending{static_cast<unsigned>(pending)}, at_version(at_version)
+    {}
+    unsigned pending;
+    // The order of pending_txns' at_version must be the same as their
+    // corresponding ceph_tid_t, as we rely on this condition for checking
+    // whether a client request is already completed. To put it another
+    // way, client requests at_version must be updated synchorously/simultaneously
+    // with ceph_tid_t.
+    const eversion_t at_version;
+    crimson::osd::acked_peers_t acked_peers;
+    seastar::shared_promise<> all_committed;
+  };
+  using pending_transactions_t = std::map<ceph_tid_t, pending_on_t>;
+  pending_transactions_t pending_trans;
+
+  seastar::future<> request_committed(
+    const osd_reqid_t& reqid, const eversion_t& at_version) final;
+};