initial code repo

[stor4nfv.git] / src / ceph / src / librbd / operation / RenameRequest.h

diff --git a/src/ceph/src/librbd/operation/RenameRequest.h b/src/ceph/src/librbd/operation/RenameRequest.h
new file mode 100644 (file)
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--- /dev/null
+++ b/src/ceph/src/librbd/operation/RenameRequest.h
@@ -0,0 +1,90 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_RENAME_REQUEST_H
+#define CEPH_LIBRBD_RENAME_REQUEST_H
+
+#include "librbd/operation/Request.h"
+#include <string>
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace operation {
+
+template <typename ImageCtxT = ImageCtx>
+class RenameRequest : public Request<ImageCtxT>
+{
+public:
+  /**
+   * Rename goes through the following state machine:
+   *
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    v
+   * STATE_READ_SOURCE_HEADER
+   *    |
+   *    v
+   * STATE_WRITE_DEST_HEADER
+   *    |
+   *    v
+   * STATE_UPDATE_DIRECTORY
+   *    |
+   *    v
+   * STATE_REMOVE_SOURCE_HEADER
+   *    |
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   *
+   */
+  enum State {
+    STATE_READ_SOURCE_HEADER,
+    STATE_WRITE_DEST_HEADER,
+    STATE_UPDATE_DIRECTORY,
+    STATE_REMOVE_SOURCE_HEADER
+  };
+
+  RenameRequest(ImageCtxT &image_ctx, Context *on_finish,
+                const std::string &dest_name);
+
+protected:
+  void send_op() override;
+  bool should_complete(int r) override;
+
+  journal::Event create_event(uint64_t op_tid) const override {
+    return journal::RenameEvent(op_tid, m_dest_name);
+  }
+
+private:
+  std::string m_dest_name;
+
+  std::string m_source_oid;
+  std::string m_dest_oid;
+
+  State m_state;
+
+  bufferlist m_header_bl;
+
+  int filter_state_return_code(int r);
+
+  void send_read_source_header();
+  void send_write_destination_header();
+  void send_update_directory();
+  void send_remove_source_header();
+
+  void apply();
+};
+
+} // namespace operation
+} // namespace librbd
+
+extern template class librbd::operation::RenameRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_RENAME_REQUEST_H