initial code repo

[stor4nfv.git] / src / ceph / src / journal / JournalTrimmer.h

diff --git a/src/ceph/src/journal/JournalTrimmer.h b/src/ceph/src/journal/JournalTrimmer.h
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+++ b/src/ceph/src/journal/JournalTrimmer.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_JOURNAL_JOURNAL_TRIMMER_H
+#define CEPH_JOURNAL_JOURNAL_TRIMMER_H
+
+#include "include/int_types.h"
+#include "include/rados/librados.hpp"
+#include "include/Context.h"
+#include "common/AsyncOpTracker.h"
+#include "common/Mutex.h"
+#include "journal/JournalMetadata.h"
+#include "cls/journal/cls_journal_types.h"
+#include <functional>
+
+struct Context;
+
+namespace journal {
+
+class JournalTrimmer {
+public:
+  typedef cls::journal::ObjectSetPosition ObjectSetPosition;
+
+  JournalTrimmer(librados::IoCtx &ioctx, const std::string &object_oid_prefix,
+                 const JournalMetadataPtr &journal_metadata);
+  ~JournalTrimmer();
+
+  void shut_down(Context *on_finish);
+
+  void remove_objects(bool force, Context *on_finish);
+  void committed(uint64_t commit_tid);
+
+private:
+  typedef std::function<Context*()> CreateContext;
+
+  struct MetadataListener : public JournalMetadataListener {
+    JournalTrimmer *journal_trimmer;
+
+    MetadataListener(JournalTrimmer *journal_trimmer)
+      : journal_trimmer(journal_trimmer) {
+    }
+    void handle_update(JournalMetadata *) override {
+      journal_trimmer->handle_metadata_updated();
+    }
+  };
+
+  struct C_CommitPositionSafe : public Context {
+    JournalTrimmer *journal_trimmer;
+
+    C_CommitPositionSafe(JournalTrimmer *_journal_trimmer)
+      : journal_trimmer(_journal_trimmer) {
+      journal_trimmer->m_async_op_tracker.start_op();
+    }
+    ~C_CommitPositionSafe() override {
+      journal_trimmer->m_async_op_tracker.finish_op();
+    }
+
+    void finish(int r) override {
+    }
+  };
+
+  struct C_RemoveSet;
+
+  librados::IoCtx m_ioctx;
+  CephContext *m_cct;
+  std::string m_object_oid_prefix;
+
+  JournalMetadataPtr m_journal_metadata;
+  MetadataListener m_metadata_listener;
+
+  AsyncOpTracker m_async_op_tracker;
+
+  Mutex m_lock;
+
+  bool m_remove_set_pending;
+  uint64_t m_remove_set;
+  Context *m_remove_set_ctx;
+
+  bool m_shutdown = false;
+
+  CreateContext m_create_commit_position_safe_context = [this]() {
+      return new C_CommitPositionSafe(this);
+    };
+
+  void trim_objects(uint64_t minimum_set);
+  void remove_set(uint64_t object_set);
+
+  void handle_metadata_updated();
+  void handle_set_removed(int r, uint64_t object_set);
+};
+
+} // namespace journal
+
+#endif // CEPH_JOURNAL_JOURNAL_TRIMMER_H