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-rw-r--r--src/librbd/object_map/SnapshotCreateRequest.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/librbd/object_map/SnapshotCreateRequest.h b/src/librbd/object_map/SnapshotCreateRequest.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_CREATE_REQUEST_H
+#define CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_CREATE_REQUEST_H
+
+#include "include/int_types.h"
+#include "common/bit_vector.hpp"
+#include "librbd/object_map/Request.h"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace object_map {
+
+class SnapshotCreateRequest : public Request {
+public:
+ /**
+ * Snapshot create goes through the following state machine:
+ *
+ * @verbatim
+ *
+ * <start>
+ * |
+ * v
+ * STATE_READ_MAP
+ * |
+ * v (skip)
+ * STATE_WRITE_MAP . . . . . . .
+ * | .
+ * v v
+ * STATE_ADD_SNAPSHOT ---> <finish>
+ *
+ * @endverbatim
+ *
+ * The _ADD_SNAPSHOT state is skipped if the FAST_DIFF feature isn't enabled.
+ */
+ enum State {
+ STATE_READ_MAP,
+ STATE_WRITE_MAP,
+ STATE_ADD_SNAPSHOT
+ };
+
+ SnapshotCreateRequest(ImageCtx &image_ctx, ceph::BitVector<2> *object_map,
+ uint64_t snap_id, Context *on_finish)
+ : Request(image_ctx, snap_id, on_finish),
+ m_object_map(*object_map), m_ret_val(0) {
+ }
+
+ void send() override;
+
+protected:
+ bool should_complete(int r) override;
+
+private:
+ State m_state = STATE_READ_MAP;
+ ceph::BitVector<2> &m_object_map;
+
+ bufferlist m_read_bl;
+ int m_ret_val;
+
+ void send_read_map();
+ void send_write_map();
+ bool send_add_snapshot();
+
+ void update_object_map();
+
+};
+
+} // namespace object_map
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_OBJECT_MAP_SNAPSHOT_CREATE_REQUEST_H