X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Flibrbd%2Foperation%2FSnapshotRemoveRequest.h;fp=src%2Fceph%2Fsrc%2Flibrbd%2Foperation%2FSnapshotRemoveRequest.h;h=0f4331ee255501bfa0df44179dfb304848eedfa0;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git diff --git a/src/ceph/src/librbd/operation/SnapshotRemoveRequest.h b/src/ceph/src/librbd/operation/SnapshotRemoveRequest.h new file mode 100644 index 0000000..0f4331e --- /dev/null +++ b/src/ceph/src/librbd/operation/SnapshotRemoveRequest.h @@ -0,0 +1,100 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#ifndef CEPH_LIBRBD_OPERATION_SNAPSHOT_REMOVE_REQUEST_H +#define CEPH_LIBRBD_OPERATION_SNAPSHOT_REMOVE_REQUEST_H + +#include "librbd/operation/Request.h" +#include "librbd/Types.h" +#include + +class Context; + +namespace librbd { + +class ImageCtx; + +namespace operation { + +template +class SnapshotRemoveRequest : public Request { +public: + /** + * Snap Remove goes through the following state machine: + * + * @verbatim + * + * ------\ + * . | + * . v + * . STATE_REMOVE_OBJECT_MAP + * . | . + * . v . + * . . > STATE_REMOVE_CHILD . + * . | . + * . | . . . . + * . | . + * . v v + * . . > STATE_REMOVE_SNAP + * | + * v + * STATE_RELEASE_SNAP_ID + * | + * v + * + * + * @endverbatim + * + * The _REMOVE_OBJECT_MAP state is skipped if the object map is not enabled. + * The _REMOVE_CHILD state is skipped if the parent is still in-use. + */ + enum State { + STATE_REMOVE_OBJECT_MAP, + STATE_REMOVE_CHILD, + STATE_REMOVE_SNAP, + STATE_RELEASE_SNAP_ID, + STATE_ERROR + }; + + SnapshotRemoveRequest(ImageCtxT &image_ctx, Context *on_finish, + const cls::rbd::SnapshotNamespace &snap_namespace, + const std::string &snap_name, + uint64_t snap_id); + +protected: + void send_op() override; + bool should_complete(int r) override; + + journal::Event create_event(uint64_t op_tid) const override { + return journal::SnapRemoveEvent(op_tid, m_snap_namespace, m_snap_name); + } + +private: + cls::rbd::SnapshotNamespace m_snap_namespace; + std::string m_snap_name; + uint64_t m_snap_id; + State m_state; + + int filter_state_return_code(int r) const { + if (m_state == STATE_REMOVE_CHILD && r == -ENOENT) { + return 0; + } + return r; + } + + void send_remove_object_map(); + void send_remove_child(); + void send_remove_snap(); + void send_release_snap_id(); + + void remove_snap_context(); + int scan_for_parents(ParentSpec &pspec); + +}; + +} // namespace operation +} // namespace librbd + +extern template class librbd::operation::SnapshotRemoveRequest; + +#endif // CEPH_LIBRBD_OPERATION_SNAPSHOT_REMOVE_REQUEST_H