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diff --git a/src/ceph/src/test/common/test_safe_io.cc b/src/ceph/src/test/common/test_safe_io.cc
new file mode 100644
index 0000000..8b98a96
--- /dev/null
+++ b/src/ceph/src/test/common/test_safe_io.cc
@@ -0,0 +1,37 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include <algorithm>
+#include <cstring>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "common/safe_io.h"
+
+#include "gtest/gtest.h"
+
+
+TEST(SafeIO, safe_read_file) {
+  const char *fname = "safe_read_testfile";
+  ::unlink(fname);
+  int fd = ::open(fname, O_RDWR|O_CREAT|O_TRUNC, 0600);
+  ASSERT_NE(fd, -1);
+  const char buf[] = "0123456789";
+  for (int i = 0; i < 8; i++) {
+    ASSERT_EQ((ssize_t)sizeof(buf), write(fd, buf, sizeof(buf)));
+  }
+  ::close(fd);
+  char rdata[80];
+  ASSERT_EQ((int)sizeof(rdata),
+	    safe_read_file(".", fname, rdata, sizeof(rdata)));
+  for (char *p = rdata, *end = rdata+sizeof(rdata); p < end; p+=sizeof(buf)) {
+    ASSERT_EQ(0, std::memcmp(p, buf, std::min(size_t(end-p), sizeof(buf))));
+  }
+  ::unlink(fname);
+}
+
+// Local Variables:
+// compile-command: "cd ../.. ;
+//   make unittest_safe_io &&
+//   ./unittest_safe_io"
+// End: