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-rw-r--r--src/librbd/operation/EnableFeaturesRequest.h135
1 files changed, 135 insertions, 0 deletions
diff --git a/src/librbd/operation/EnableFeaturesRequest.h b/src/librbd/operation/EnableFeaturesRequest.h
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+++ b/src/librbd/operation/EnableFeaturesRequest.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_OPERATION_ENABLE_FEATURES_REQUEST_H
+#define CEPH_LIBRBD_OPERATION_ENABLE_FEATURES_REQUEST_H
+
+#include "librbd/operation/Request.h"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace operation {
+
+template <typename ImageCtxT = ImageCtx>
+class EnableFeaturesRequest : public Request<ImageCtxT> {
+public:
+ static EnableFeaturesRequest *create(ImageCtxT &image_ctx, Context *on_finish,
+ uint64_t journal_op_tid,
+ uint64_t features) {
+ return new EnableFeaturesRequest(image_ctx, on_finish, journal_op_tid,
+ features);
+ }
+
+ EnableFeaturesRequest(ImageCtxT &image_ctx, Context *on_finish,
+ uint64_t journal_op_tid, uint64_t features);
+
+protected:
+ void send_op() override;
+ bool should_complete(int r) override;
+ bool can_affect_io() const override {
+ return true;
+ }
+ journal::Event create_event(uint64_t op_tid) const override {
+ return journal::UpdateFeaturesEvent(op_tid, m_features, true);
+ }
+
+private:
+ /**
+ * EnableFeatures goes through the following state machine:
+ *
+ * @verbatim
+ *
+ * <start>
+ * |
+ * v
+ * STATE_PREPARE_LOCK
+ * |
+ * v
+ * STATE_BLOCK_WRITES
+ * |
+ * v
+ * STATE_GET_MIRROR_MODE
+ * |
+ * v
+ * STATE_CREATE_JOURNAL (skip if not
+ * | required)
+ * v
+ * STATE_APPEND_OP_EVENT (skip if journaling
+ * | disabled)
+ * v
+ * STATE_UPDATE_FLAGS
+ * |
+ * v
+ * STATE_SET_FEATURES
+ * |
+ * v
+ * STATE_CREATE_OBJECT_MAP (skip if not
+ * | required)
+ * v
+ * STATE_ENABLE_MIRROR_IMAGE
+ * |
+ * V
+ * STATE_NOTIFY_UPDATE
+ * |
+ * | (unblock writes)
+ * v
+ * <finish>
+ * @endverbatim
+ *
+ */
+
+ uint64_t m_features;
+
+ bool m_enable_mirroring = false;
+ bool m_requests_blocked = false;
+ bool m_writes_blocked = false;
+
+ uint64_t m_new_features = 0;
+ uint64_t m_enable_flags = 0;
+ uint64_t m_features_mask = 0;
+
+ bufferlist m_out_bl;
+
+ void send_prepare_lock();
+ Context *handle_prepare_lock(int *result);
+
+ void send_block_writes();
+ Context *handle_block_writes(int *result);
+
+ void send_get_mirror_mode();
+ Context *handle_get_mirror_mode(int *result);
+
+ void send_create_journal();
+ Context *handle_create_journal(int *result);
+
+ void send_append_op_event();
+ Context *handle_append_op_event(int *result);
+
+ void send_update_flags();
+ Context *handle_update_flags(int *result);
+
+ void send_set_features();
+ Context *handle_set_features(int *result);
+
+ void send_create_object_map();
+ Context *handle_create_object_map(int *result);
+
+ void send_enable_mirror_image();
+ Context *handle_enable_mirror_image(int *result);
+
+ void send_notify_update();
+ Context *handle_notify_update(int *result);
+
+ Context *handle_finish(int r);
+};
+
+} // namespace operation
+} // namespace librbd
+
+extern template class librbd::operation::EnableFeaturesRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_OPERATION_ENABLE_FEATURES_REQUEST_H