v4.19.13 snapshot.
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
new file mode 100644
index 0000000..4828f7f
--- /dev/null
+++ b/tools/perf/util/data.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_DATA_H
+#define __PERF_DATA_H
+
+#include <stdbool.h>
+
+enum perf_data_mode {
+ PERF_DATA_MODE_WRITE,
+ PERF_DATA_MODE_READ,
+};
+
+struct perf_data_file {
+ const char *path;
+ int fd;
+};
+
+struct perf_data {
+ struct perf_data_file file;
+ bool is_pipe;
+ bool force;
+ unsigned long size;
+ enum perf_data_mode mode;
+};
+
+static inline bool perf_data__is_read(struct perf_data *data)
+{
+ return data->mode == PERF_DATA_MODE_READ;
+}
+
+static inline bool perf_data__is_write(struct perf_data *data)
+{
+ return data->mode == PERF_DATA_MODE_WRITE;
+}
+
+static inline int perf_data__is_pipe(struct perf_data *data)
+{
+ return data->is_pipe;
+}
+
+static inline int perf_data__fd(struct perf_data *data)
+{
+ return data->file.fd;
+}
+
+static inline unsigned long perf_data__size(struct perf_data *data)
+{
+ return data->size;
+}
+
+int perf_data__open(struct perf_data *data);
+void perf_data__close(struct perf_data *data);
+ssize_t perf_data__write(struct perf_data *data,
+ void *buf, size_t size);
+ssize_t perf_data_file__write(struct perf_data_file *file,
+ void *buf, size_t size);
+/*
+ * If at_exit is set, only rename current perf.data to
+ * perf.data.<postfix>, continue write on original data.
+ * Set at_exit when flushing the last output.
+ *
+ * Return value is fd of new output.
+ */
+int perf_data__switch(struct perf_data *data,
+ const char *postfix,
+ size_t pos, bool at_exit);
+#endif /* __PERF_DATA_H */