projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
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_REMOVE_REQUEST_H | |
| 5 | #define CEPH_LIBRBD_OPERATION_SNAPSHOT_REMOVE_REQUEST_H | |
| 6 | ||
| 7 | #include "librbd/operation/Request.h" | |
| 8 | #include "librbd/Types.h" | |
| 9 | #include <string> | |
| 10 | ||
| 11 | class Context; | |
| 12 | ||
| 13 | namespace librbd { | |
| 14 | ||
| 15 | class ImageCtx; | |
| 16 | ||
| 17 | namespace operation { | |
| 18 | ||
| 19 | template <typename ImageCtxT = ImageCtx> | |
| 20 | class SnapshotRemoveRequest : public Request<ImageCtxT> { | |
| 21 | public: | |
| 22 | /** | |
| 23 | * Snap Remove goes through the following state machine: | |
| 24 | * | |
| 25 | * @verbatim | |
| 26 | * | |
| 27 | * <start> ------\ | |
| 28 | * . | | |
| 29 | * . v | |
| 30 | * . STATE_REMOVE_OBJECT_MAP | |
| 31 | * . | . | |
| 32 | * . v . | |
| 33 | * . . > STATE_REMOVE_CHILD . | |
| 34 | * . | . | |
| 35 | * . | . . . . | |
| 36 | * . | . | |
| 37 | * . v v | |
| 38 | * . . > STATE_REMOVE_SNAP | |
| 39 | * | | |
| 40 | * v | |
| 41 | * STATE_RELEASE_SNAP_ID | |
| 42 | * | | |
| 43 | * v | |
| 44 | * <finish> | |
| 45 | * | |
| 46 | * @endverbatim | |
| 47 | * | |
| 48 | * The _REMOVE_OBJECT_MAP state is skipped if the object map is not enabled. | |
| 49 | * The _REMOVE_CHILD state is skipped if the parent is still in-use. | |
| 50 | */ | |
| 51 | enum State { | |
| 52 | STATE_REMOVE_OBJECT_MAP, | |
| 53 | STATE_REMOVE_CHILD, | |
| 54 | STATE_REMOVE_SNAP, | |
| 55 | STATE_RELEASE_SNAP_ID, | |
| 56 | STATE_ERROR | |
| 57 | }; | |
| 58 | ||
| 59 | SnapshotRemoveRequest(ImageCtxT &image_ctx, Context *on_finish, | |
| 60 | const cls::rbd::SnapshotNamespace &snap_namespace, | |
| 61 | const std::string &snap_name, | |
| 62 | uint64_t snap_id); | |
| 63 | ||
| 64 | protected: | |
| 65 | void send_op() override; | |
| 66 | bool should_complete(int r) override; | |
| 67 | ||
| 68 | journal::Event create_event(uint64_t op_tid) const override { | |
| 69 | return journal::SnapRemoveEvent(op_tid, m_snap_namespace, m_snap_name); | |
| 70 | } | |
| 71 | ||
| 72 | private: | |
| 73 | cls::rbd::SnapshotNamespace m_snap_namespace; | |
| 74 | std::string m_snap_name; | |
| 75 | uint64_t m_snap_id; | |
| 76 | State m_state; | |
| 77 | ||
| 78 | int filter_state_return_code(int r) const { | |
| 79 | if (m_state == STATE_REMOVE_CHILD && r == -ENOENT) { | |
| 80 | return 0; | |
| 81 | } | |
| 82 | return r; | |
| 83 | } | |
| 84 | ||
| 85 | void send_remove_object_map(); | |
| 86 | void send_remove_child(); | |
| 87 | void send_remove_snap(); | |
| 88 | void send_release_snap_id(); | |
| 89 | ||
| 90 | void remove_snap_context(); | |
| 91 | int scan_for_parents(ParentSpec &pspec); | |
| 92 | ||
| 93 | }; | |
| 94 | ||
| 95 | } // namespace operation | |
| 96 | } // namespace librbd | |
| 97 | ||
| 98 | extern template class librbd::operation::SnapshotRemoveRequest<librbd::ImageCtx>; | |
| 99 | ||
| 100 | #endif // CEPH_LIBRBD_OPERATION_SNAPSHOT_REMOVE_REQUEST_H |