copyfile_offset   120 tools/perf/util/copyfile.c 	err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
copyfile_offset    14 tools/perf/util/copyfile.h int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size);