ceph/src/librbd/operation/SnapshotProtectRequest.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_LIBRBD_OPERATION_SNAPSHOT_PROTECT_REQUEST_H
   5 #define CEPH_LIBRBD_OPERATION_SNAPSHOT_PROTECT_REQUEST_H
   6
   7 #include "librbd/operation/Request.h"
   8 #include <string>
   9
  10 class Context;
  11
  12 namespace librbd {
  13
  14 class ImageCtx;
  15
  16 namespace operation {
  17
  18 template <typename ImageCtxT = ImageCtx>
  19 class SnapshotProtectRequest : public Request<ImageCtxT> {
  20 public:
  21   /**
  22    * Snap Protect goes through the following state machine:
  23    *
  24    * @verbatim
  25    *
  26    * <start>
  27    *    |
  28    *    v
  29    * STATE_PROTECT_SNAP
  30    *    |
  31    *    v
  32    * <finish>
  33    *
  34    * @endverbatim
  35    *
  36    */
  37   enum State {
  38     STATE_PROTECT_SNAP
  39   };
  40
  41   SnapshotProtectRequest(ImageCtxT &image_ctx, Context *on_finish,
  42                          const cls::rbd::SnapshotNamespace &snap_namespace,
  43                          const std::string &snap_name);
  44
  45 protected:
  46   void send_op() override;
  47   bool should_complete(int r) override;
  48
  49   journal::Event create_event(uint64_t op_tid) const override {
  50     return journal::SnapProtectEvent(op_tid, m_snap_namespace, m_snap_name);
  51   }
  52
  53 private:
  54   cls::rbd::SnapshotNamespace m_snap_namespace;
  55   std::string m_snap_name;
  56   State m_state;
  57
  58   void send_protect_snap();
  59
  60   int verify_and_send_protect_snap();
  61 };
  62
  63 } // namespace operation
  64 } // namespace librbd
  65
  66 extern template class librbd::operation::SnapshotProtectRequest<librbd::ImageCtx>;
  67
  68 #endif // CEPH_LIBRBD_OPERATION_SNAPSHOT_PROTECT_REQUEST_H