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-rw-r--r--src/librbd/object_map/SnapshotRemoveRequest.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/src/librbd/object_map/SnapshotRemoveRequest.h b/src/librbd/object_map/SnapshotRemoveRequest.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_REMOVE_REQUEST_H
+#define CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_REMOVE_REQUEST_H
+
+#include "include/int_types.h"
+#include "include/buffer.h"
+#include "common/bit_vector.hpp"
+#include "librbd/AsyncRequest.h"
+
+namespace librbd {
+namespace object_map {
+
+class SnapshotRemoveRequest : public AsyncRequest<> {
+public:
+ /**
+ * Snapshot rollback goes through the following state machine:
+ *
+ * @verbatim
+ *
+ * <start> -----------> STATE_LOAD_MAP ----\
+ * . * |
+ * . * (error) |
+ * . (invalid object map) v |
+ * . . . > STATE_INVALIDATE_NEXT_MAP |
+ * . | |
+ * . | |
+ * . (fast diff disabled) v v
+ * . . . . . . . . . . > STATE_REMOVE_MAP
+ * |
+ * v
+ * <finish>
+ *
+ * @endverbatim
+ *
+ * The _LOAD_MAP state is skipped if the fast diff feature is disabled.
+ * If the fast diff feature is enabled and the snapshot is flagged as
+ * invalid, the next snapshot / HEAD object mapis flagged as invalid;
+ * otherwise, the state machine proceeds to remove the object map.
+ */
+
+ SnapshotRemoveRequest(ImageCtx &image_ctx, ceph::BitVector<2> *object_map,
+ uint64_t snap_id, Context *on_finish)
+ : AsyncRequest(image_ctx, on_finish), m_object_map(*object_map),
+ m_snap_id(snap_id), m_next_snap_id(CEPH_NOSNAP) {
+ }
+
+ void send() override;
+
+protected:
+ bool should_complete(int r) override {
+ return true;
+ }
+
+private:
+ ceph::BitVector<2> &m_object_map;
+ uint64_t m_snap_id;
+ uint64_t m_next_snap_id;
+
+ uint64_t m_flags = 0;
+
+ ceph::BitVector<2> m_snap_object_map;
+ bufferlist m_out_bl;
+
+ void load_map();
+ void handle_load_map(int r);
+
+ void remove_snapshot();
+ void handle_remove_snapshot(int r);
+
+ void invalidate_next_map();
+ void handle_invalidate_next_map(int r);
+
+ void remove_map();
+ void handle_remove_map(int r);
+
+ void compute_next_snap_id();
+ void update_object_map();
+};
+
+} // namespace object_map
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_REMOVE_REQUEST_H