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diff --git a/src/ceph/src/test/common/Readahead.cc b/src/ceph/src/test/common/Readahead.cc
new file mode 100644
index 0000000..9b4e612
--- /dev/null
+++ b/src/ceph/src/test/common/Readahead.cc
@@ -0,0 +1,130 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Adam Crume <adamcrume@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include "common/Readahead.h"
+#include "gtest/gtest.h"
+#include <stdint.h>
+#include <boost/foreach.hpp>
+#include <cstdarg>
+
+
+#define ASSERT_RA(expected_offset, expected_length, ra) \
+  do { \
+    Readahead::extent_t e = ra; \
+    ASSERT_EQ((uint64_t)expected_length, e.second);	\
+    if (expected_length) { \
+      ASSERT_EQ((uint64_t)expected_offset, e.first); \
+    } \
+  } while(0)
+
+TEST(Readahead, random_access) {
+  Readahead r;
+  r.set_trigger_requests(2);
+  ASSERT_RA(0, 0, r.update(1000, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1010, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1030, 20, r.update(1020, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1040, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1060, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1080, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1100, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1200, 10, Readahead::NO_LIMIT));
+}
+
+TEST(Readahead, min_size_limit) {
+  Readahead r;
+  r.set_trigger_requests(2);
+  r.set_min_readahead_size(40);
+  ASSERT_RA(0, 0, r.update(1000, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1010, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1030, 40, r.update(1020, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1030, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1070, 80, r.update(1040, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1050, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1060, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1070, 10, Readahead::NO_LIMIT));
+}
+
+TEST(Readahead, max_size_limit) {
+  Readahead r;
+  r.set_trigger_requests(2);
+  r.set_max_readahead_size(50);
+  ASSERT_RA(0, 0, r.update(1000, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1010, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1030, 20, r.update(1020, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1050, 40, r.update(1030, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1040, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1050, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1090, 50, r.update(1060, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1070, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1080, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1090, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1100, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1140, 50, r.update(1110, 10, Readahead::NO_LIMIT));
+}
+
+TEST(Readahead, limit) {
+  Readahead r;
+  r.set_trigger_requests(2);
+  r.set_max_readahead_size(50);
+  uint64_t limit = 1100;
+  ASSERT_RA(0, 0, r.update(1000, 10, limit));
+  ASSERT_RA(0, 0, r.update(1010, 10, limit));
+  ASSERT_RA(1030, 20, r.update(1020, 10, limit));
+  ASSERT_RA(1050, 40, r.update(1030, 10, limit));
+  ASSERT_RA(0, 0, r.update(1040, 10, limit));
+  ASSERT_RA(0, 0, r.update(1050, 10, limit));
+  ASSERT_RA(1090, 10, r.update(1060, 10, limit));
+  ASSERT_RA(0, 0, r.update(1070, 10, limit));
+  ASSERT_RA(0, 0, r.update(1080, 10, limit));
+  ASSERT_RA(0, 0, r.update(1090, 10, limit));
+}
+
+TEST(Readahead, alignment) {
+  Readahead r;
+  r.set_trigger_requests(2);
+  vector<uint64_t> alignment;
+  alignment.push_back(100);
+  r.set_alignments(alignment);
+  ASSERT_RA(0, 0, r.update(1000, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1010, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1030, 20, r.update(1020, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1050, 50, r.update(1030, 10, Readahead::NO_LIMIT)); // internal readahead size 40
+  ASSERT_RA(0, 0, r.update(1040, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1050, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1060, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1100, 100, r.update(1070, 10, Readahead::NO_LIMIT)); // internal readahead size 80
+  ASSERT_RA(0, 0, r.update(1080, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1090, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1100, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1110, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1120, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1130, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1200, 200, r.update(1140, 10, Readahead::NO_LIMIT)); // internal readahead size 160
+  ASSERT_RA(0, 0, r.update(1150, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1160, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1170, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1180, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1190, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1200, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1210, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1220, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1230, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1240, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1250, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1260, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1270, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(0, 0, r.update(1280, 10, Readahead::NO_LIMIT));
+  ASSERT_RA(1400, 300, r.update(1290, 10, Readahead::NO_LIMIT)); // internal readahead size 320
+  ASSERT_RA(0, 0, r.update(1300, 10, Readahead::NO_LIMIT));
+}