X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Flibrbd%2Foperation%2FSnapshotCreateRequest.h;fp=src%2Fceph%2Fsrc%2Flibrbd%2Foperation%2FSnapshotCreateRequest.h;h=571916000f2a24a452404e0b836172254ed2834c;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git diff --git a/src/ceph/src/librbd/operation/SnapshotCreateRequest.h b/src/ceph/src/librbd/operation/SnapshotCreateRequest.h new file mode 100644 index 0000000..5719160 --- /dev/null +++ b/src/ceph/src/librbd/operation/SnapshotCreateRequest.h @@ -0,0 +1,126 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#ifndef CEPH_LIBRBD_OPERATION_SNAPSHOT_CREATE_REQUEST_H +#define CEPH_LIBRBD_OPERATION_SNAPSHOT_CREATE_REQUEST_H + +#include "cls/rbd/cls_rbd_types.h" +#include "librbd/Types.h" +#include "librbd/operation/Request.h" +#include + +class Context; + +namespace librbd { + +class ImageCtx; + +namespace operation { + +template +class SnapshotCreateRequest : public Request { +public: + /** + * Snap Create goes through the following state machine: + * + * @verbatim + * + * + * | + * v + * STATE_SUSPEND_REQUESTS + * | + * v + * STATE_SUSPEND_AIO * * * * * * * * * * * * * + * | * + * v * + * STATE_APPEND_OP_EVENT (skip if journal * + * | disabled) * + * (retry) v * + * . . . > STATE_ALLOCATE_SNAP_ID * + * . | * + * . v * + * . . . . STATE_CREATE_SNAP * * * * * * * * * * * + * | * * + * v * * + * STATE_CREATE_OBJECT_MAP (skip if * * + * | disabled) * * + * | * * + * | v * + * | STATE_RELEASE_SNAP_ID * + * | | * + * | v * + * \----------------> < * * * * * + * + * @endverbatim + * + * The _CREATE_STATE state may repeat back to the _ALLOCATE_SNAP_ID state + * if a stale snapshot context is allocated. If the create operation needs + * to abort, the error path is followed to record the result in the journal + * (if enabled) and bubble the originating error code back to the client. + */ + SnapshotCreateRequest(ImageCtxT &image_ctx, Context *on_finish, + const cls::rbd::SnapshotNamespace &snap_namespace, + const std::string &snap_name, + uint64_t journal_op_tid, + bool skip_object_map); + +protected: + void send_op() override; + bool should_complete(int r) override { + return true; + } + bool can_affect_io() const override { + return true; + } + journal::Event create_event(uint64_t op_tid) const override { + return journal::SnapCreateEvent(op_tid, m_snap_namespace, m_snap_name); + } + +private: + cls::rbd::SnapshotNamespace m_snap_namespace; + std::string m_snap_name; + bool m_skip_object_map; + + int m_ret_val; + + uint64_t m_snap_id; + uint64_t m_size; + ParentInfo m_parent_info; + + void send_suspend_requests(); + Context *handle_suspend_requests(int *result); + + void send_suspend_aio(); + Context *handle_suspend_aio(int *result); + + void send_append_op_event(); + Context *handle_append_op_event(int *result); + + void send_allocate_snap_id(); + Context *handle_allocate_snap_id(int *result); + + void send_create_snap(); + Context *handle_create_snap(int *result); + + Context *send_create_object_map(); + Context *handle_create_object_map(int *result); + + void send_release_snap_id(); + Context *handle_release_snap_id(int *result); + + void update_snap_context(); + + void save_result(int *result) { + if (m_ret_val == 0 && *result < 0) { + m_ret_val = *result; + } + } +}; + +} // namespace operation +} // namespace librbd + +extern template class librbd::operation::SnapshotCreateRequest; + +#endif // CEPH_LIBRBD_OPERATION_SNAPSHOT_CREATE_REQUEST_H