diff options
Diffstat (limited to 'src/librbd/mirror/DemoteRequest.h')
-rw-r--r-- | src/librbd/mirror/DemoteRequest.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/librbd/mirror/DemoteRequest.h b/src/librbd/mirror/DemoteRequest.h new file mode 100644 index 00000000..7dc0585e --- /dev/null +++ b/src/librbd/mirror/DemoteRequest.h @@ -0,0 +1,85 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#ifndef CEPH_LIBRBD_MIRROR_DEMOTE_REQUEST_H +#define CEPH_LIBRBD_MIRROR_DEMOTE_REQUEST_H + +#include "cls/rbd/cls_rbd_types.h" +#include "librbd/mirror/Types.h" + +struct Context; + +namespace librbd { + +struct ImageCtx; + +namespace mirror { + +template <typename ImageCtxT = librbd::ImageCtx> +class DemoteRequest { +public: + static DemoteRequest *create(ImageCtxT &image_ctx, Context *on_finish) { + return new DemoteRequest(image_ctx, on_finish); + } + + DemoteRequest(ImageCtxT &image_ctx, Context *on_finish) + : m_image_ctx(image_ctx), m_on_finish(on_finish) { + } + + void send(); + +private: + /** + * @verbatim + * + * <start> + * | + * v + * GET_INFO + * | + * v + * ACQUIRE_LOCK * * * * + * | * + * v * + * DEMOTE * + * | * + * v * + * RELEASE_LOCK * + * | * + * v * + * <finish> < * * * * * + * + * @endverbatim + */ + + ImageCtxT &m_image_ctx; + Context *m_on_finish; + + int m_ret_val = 0; + bool m_blocked_requests = false; + + cls::rbd::MirrorImage m_mirror_image; + PromotionState m_promotion_state = PROMOTION_STATE_PRIMARY; + + void get_info(); + void handle_get_info(int r); + + void acquire_lock(); + void handle_acquire_lock(int r); + + void demote(); + void handle_demote(int r); + + void release_lock(); + void handle_release_lock(int r); + + void finish(int r); + +}; + +} // namespace mirror +} // namespace librbd + +extern template class librbd::mirror::DemoteRequest<librbd::ImageCtx>; + +#endif // CEPH_LIBRBD_MIRROR_DEMOTE_REQUEST_H |