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-rw-r--r--src/librbd/operation/RenameRequest.h95
1 files changed, 95 insertions, 0 deletions
diff --git a/src/librbd/operation/RenameRequest.h b/src/librbd/operation/RenameRequest.h
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+++ b/src/librbd/operation/RenameRequest.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_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_DIRECTORY
+ * |
+ * 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_DIRECTORY,
+ 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;
+ int filter_return_code(int r) const 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 = STATE_READ_DIRECTORY;
+
+ bufferlist m_source_name_bl;
+ bufferlist m_header_bl;
+
+ void send_read_directory();
+ 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