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-rw-r--r--src/librbd/journal/DemoteRequest.h107
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diff --git a/src/librbd/journal/DemoteRequest.h b/src/librbd/journal/DemoteRequest.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_LIBRBD_JOURNAL_DEMOTE_REQUEST_H
+#define CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H
+
+#include "common/ceph_mutex.h"
+#include "cls/journal/cls_journal_types.h"
+#include "journal/Future.h"
+#include "librbd/journal/Types.h"
+#include "librbd/journal/TypeTraits.h"
+
+struct Context;
+
+namespace librbd {
+
+struct ImageCtx;
+
+namespace journal {
+
+template <typename ImageCtxT = librbd::ImageCtx>
+class DemoteRequest {
+public:
+ static DemoteRequest *create(ImageCtxT &image_ctx, Context *on_finish) {
+ return new DemoteRequest(image_ctx, on_finish);
+ }
+
+ DemoteRequest(ImageCtxT &image_ctx, Context *on_finish);
+ ~DemoteRequest();
+
+ void send();
+
+private:
+ /**
+ * @verbatim
+ *
+ * <start>
+ * |
+ * v
+ * OPEN_JOURNALER * * * * *
+ * | *
+ * v *
+ * ALLOCATE_TAG * * * * * *
+ * | *
+ * v *
+ * APPEND_EVENT * * * *
+ * | * *
+ * v * *
+ * COMMIT_EVENT * *
+ * | * *
+ * v * *
+ * STOP_APPEND <* * * *
+ * | *
+ * v *
+ * SHUT_DOWN_JOURNALER <* *
+ * |
+ * v
+ * <finish>
+ *
+ * @endverbatim
+ */
+
+ typedef typename TypeTraits<ImageCtxT>::Journaler Journaler;
+ typedef typename TypeTraits<ImageCtxT>::Future Future;
+
+ ImageCtxT &m_image_ctx;
+ Context *m_on_finish;
+
+ Journaler *m_journaler = nullptr;
+ int m_ret_val = 0;
+
+ ceph::mutex m_lock;
+ ImageClientMeta m_client_meta;
+ uint64_t m_tag_tid = 0;
+ TagData m_tag_data;
+
+ cls::journal::Tag m_tag;
+ Future m_future;
+
+ void open_journaler();
+ void handle_open_journaler(int r);
+
+ void allocate_tag();
+ void handle_allocate_tag(int r);
+
+ void append_event();
+ void handle_append_event(int r);
+
+ void commit_event();
+ void handle_commit_event(int r);
+
+ void stop_append();
+ void handle_stop_append(int r);
+
+ void shut_down_journaler();
+ void handle_shut_down_journaler(int r);
+
+ void finish(int r);
+
+};
+
+} // namespace journal
+} // namespace librbd
+
+extern template class librbd::journal::DemoteRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_JOURNAL_DEMOTE_REQUEST_H