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-rw-r--r--src/librbd/cache/pwl/DiscardRequest.h90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/librbd/cache/pwl/DiscardRequest.h b/src/librbd/cache/pwl/DiscardRequest.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_CACHE_PWL_SHUTDOWN_REQUEST_H
+#define CEPH_LIBRBD_CACHE_PWL_SHUTDOWN_REQUEST_H
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+namespace plugin { template <typename> struct Api; }
+
+namespace cache {
+
+namespace pwl {
+
+template<typename>
+class ImageCacheState;
+
+template <typename ImageCtxT = ImageCtx>
+class DiscardRequest {
+public:
+ static DiscardRequest* create(
+ ImageCtxT &image_ctx,
+ plugin::Api<ImageCtxT>& plugin_api,
+ Context *on_finish);
+
+ void send();
+
+private:
+
+ /**
+ * @verbatim
+ *
+ * Shutdown request goes through the following state machine:
+ *
+ * <start>
+ * |
+ * v
+ * REMOVE_IMAGE_CACHE_FILE
+ * |
+ * v
+ * REMOVE_IMAGE_CACHE_STATE
+ * |
+ * v
+ * REMOVE_IMAGE_FEATURE_BIT
+ * |
+ * v
+ * <finish>
+ *
+ * @endverbatim
+ */
+
+ DiscardRequest(ImageCtxT &image_ctx,
+ plugin::Api<ImageCtxT>& plugin_api,
+ Context *on_finish);
+
+ ImageCtxT &m_image_ctx;
+ ImageCacheState<ImageCtxT>* m_cache_state;
+ plugin::Api<ImageCtxT>& m_plugin_api;
+ Context *m_on_finish;
+
+ int m_error_result;
+
+ void delete_image_cache_file();
+
+ void remove_image_cache_state();
+ void handle_remove_image_cache_state(int r);
+
+ void remove_feature_bit();
+ void handle_remove_feature_bit(int r);
+
+ void finish();
+
+ void save_result(int result) {
+ if (m_error_result == 0 && result < 0) {
+ m_error_result = result;
+ }
+ }
+
+};
+
+} // namespace pwl
+} // namespace cache
+} // namespace librbd
+
+extern template class librbd::cache::pwl::DiscardRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_CACHE_PWL_SHUTDOWN_REQUEST_H