initial code repo

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

diff --git a/src/ceph/src/librbd/operation/DisableFeaturesRequest.h b/src/ceph/src/librbd/operation/DisableFeaturesRequest.h
new file mode 100644 (file)
index 0000000..b064bc4
--- /dev/null
+++ b/src/ceph/src/librbd/operation/DisableFeaturesRequest.h
@@ -0,0 +1,171 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_OPERATION_DISABLE_FEATURES_REQUEST_H
+#define CEPH_LIBRBD_OPERATION_DISABLE_FEATURES_REQUEST_H
+
+#include "librbd/ImageCtx.h"
+#include "librbd/operation/Request.h"
+#include "cls/rbd/cls_rbd_client.h"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace operation {
+
+template <typename ImageCtxT = ImageCtx>
+class DisableFeaturesRequest : public Request<ImageCtxT> {
+public:
+  static DisableFeaturesRequest *create(ImageCtxT &image_ctx, Context *on_finish,
+                                        uint64_t journal_op_tid,
+                                        uint64_t features, bool force) {
+    return new DisableFeaturesRequest(image_ctx, on_finish, journal_op_tid,
+                                      features, force);
+  }
+
+  DisableFeaturesRequest(ImageCtxT &image_ctx, Context *on_finish,
+                         uint64_t journal_op_tid, uint64_t features, bool force);
+
+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, false);
+  }
+
+private:
+  /**
+   * DisableFeatures goes through the following state machine:
+   *
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    v
+   * STATE_PREPARE_LOCK
+   *    |
+   *    v
+   * STATE_BLOCK_WRITES
+   *    |
+   *    v
+   * STATE_ACQUIRE_EXCLUSIVE_LOCK (skip if not
+   *    |                          required)
+   *    | (disbling journaling)
+   *    \-------------------\
+   *    |                    |
+   *    |                    V
+   *    |                 STATE_GET_MIRROR_MODE
+   *    |(not                |
+   *    | disabling          v
+   *    | journaling)     STATE_GET_MIRROR_IMAGE
+   *    |                    |
+   *    |                    v
+   *    |                 STATE_DISABLE_MIRROR_IMAGE (skip if not
+   *    |                    |                        required)
+   *    |                    v
+   *    |                 STATE_CLOSE_JOURNAL
+   *    |                    |
+   *    |                    v
+   *    |                 STATE_REMOVE_JOURNAL
+   *    |                    |
+   *    |/-------------------/
+   *    |
+   *    v
+   * STATE_APPEND_OP_EVENT (skip if journaling
+   *    |                   disabled)
+   *    v
+   * STATE_REMOVE_OBJECT_MAP (skip if not
+   *    |                     disabling object map)
+   *    v
+   * STATE_SET_FEATURES
+   *    |
+   *    v
+   * STATE_UPDATE_FLAGS
+   *    |
+   *    v
+   * STATE_NOTIFY_UPDATE
+   *    |
+   *    v
+   * STATE_REALEASE_EXCLUSIVE_LOCK (skip if not
+   *    |                           required)
+   *    | (unblock writes)
+   *    v
+   * <finish>
+   *
+   * @endverbatim
+   *
+   */
+
+  uint64_t m_features;
+  bool m_force;
+
+  bool m_acquired_lock = false;
+  bool m_writes_blocked = false;
+  bool m_snap_lock_acquired = false;
+  bool m_requests_blocked = false;
+
+  uint64_t m_new_features = 0;
+  uint64_t m_disable_flags = 0;
+  uint64_t m_features_mask = 0;
+
+  decltype(ImageCtxT::journal) m_journal = nullptr;
+  cls::rbd::MirrorMode m_mirror_mode = cls::rbd::MIRROR_MODE_DISABLED;
+  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_acquire_exclusive_lock();
+  Context *handle_acquire_exclusive_lock(int *result);
+
+  void send_get_mirror_mode();
+  Context *handle_get_mirror_mode(int *result);
+
+  void send_get_mirror_image();
+  Context *handle_get_mirror_image(int *result);
+
+  void send_disable_mirror_image();
+  Context *handle_disable_mirror_image(int *result);
+
+  void send_close_journal();
+  Context *handle_close_journal(int *result);
+
+  void send_remove_journal();
+  Context *handle_remove_journal(int *result);
+
+  void send_append_op_event();
+  Context *handle_append_op_event(int *result);
+
+  void send_remove_object_map();
+  Context *handle_remove_object_map(int *result);
+
+  void send_set_features();
+  Context *handle_set_features(int *result);
+
+  void send_update_flags();
+  Context *handle_update_flags(int *result);
+
+  void send_notify_update();
+  Context *handle_notify_update(int *result);
+
+  void send_release_exclusive_lock();
+  Context *handle_release_exclusive_lock(int *result);
+
+  Context *handle_finish(int r);
+};
+
+} // namespace operation
+} // namespace librbd
+
+extern template class librbd::operation::DisableFeaturesRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_OPERATION_DISABLE_FEATURES_REQUEST_H