1 files changed, 98 insertions, 0 deletions
diff --git a/src/test/librbd/test_BlockGuard.cc b/src/test/librbd/test_BlockGuard.cc
new file mode 100644
index 000000000..e41e58825
--- /dev/null
+++ b/src/test/librbd/test_BlockGuard.cc
@@ -0,0 +1,98 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "test/librbd/test_fixture.h"
+#include "test/librbd/test_support.h"
+#include "librbd/BlockGuard.h"
+
+namespace librbd {
+
+class TestIOBlockGuard : public TestFixture {
+public:
+  static uint32_t s_index;
+
+  struct Operation {
+    uint32_t index;
+    Operation() : index(++s_index) {
+    }
+    Operation(Operation &&rhs) : index(rhs.index) {
+    }
+    Operation(const Operation &) = delete;
+
+    Operation& operator=(Operation &&rhs) {
+      index = rhs.index;
+      return *this;
+    }
+
+    bool operator==(const Operation &rhs) const {
+      return index == rhs.index;
+    }
+  };
+
+  typedef std::list<Operation> Operations;
+
+  typedef BlockGuard<Operation> OpBlockGuard;
+
+  void SetUp() override {
+    TestFixture::SetUp();
+    m_cct = reinterpret_cast<CephContext*>(m_ioctx.cct());
+  }
+
+  CephContext *m_cct;
+};
+
+TEST_F(TestIOBlockGuard, NonDetainedOps) {
+  OpBlockGuard op_block_guard(m_cct);
+
+  Operation op1;
+  BlockGuardCell *cell1;
+  ASSERT_EQ(0, op_block_guard.detain({1, 3}, &op1, &cell1));
+
+  Operation op2;
+  BlockGuardCell *cell2;
+  ASSERT_EQ(0, op_block_guard.detain({0, 1}, &op2, &cell2));
+
+  Operation op3;
+  BlockGuardCell *cell3;
+  ASSERT_EQ(0, op_block_guard.detain({3, 6}, &op3, &cell3));
+
+  Operations released_ops;
+  op_block_guard.release(cell1, &released_ops);
+  ASSERT_TRUE(released_ops.empty());
+
+  op_block_guard.release(cell2, &released_ops);
+  ASSERT_TRUE(released_ops.empty());
+
+  op_block_guard.release(cell3, &released_ops);
+  ASSERT_TRUE(released_ops.empty());
+}
+
+TEST_F(TestIOBlockGuard, DetainedOps) {
+  OpBlockGuard op_block_guard(m_cct);
+
+  Operation op1;
+  BlockGuardCell *cell1;
+  ASSERT_EQ(0, op_block_guard.detain({1, 3}, &op1, &cell1));
+
+  Operation op2;
+  BlockGuardCell *cell2;
+  ASSERT_EQ(1, op_block_guard.detain({2, 6}, &op2, &cell2));
+  ASSERT_EQ(nullptr, cell2);
+
+  Operation op3;
+  BlockGuardCell *cell3;
+  ASSERT_EQ(2, op_block_guard.detain({0, 2}, &op3, &cell3));
+  ASSERT_EQ(nullptr, cell3);
+
+  Operations expected_ops;
+  expected_ops.push_back(std::move(op2));
+  expected_ops.push_back(std::move(op3));
+  Operations released_ops;
+  op_block_guard.release(cell1, &released_ops);
+  ASSERT_EQ(expected_ops, released_ops);
+}
+
+uint32_t TestIOBlockGuard::s_index = 0;
+
+} // namespace librbd
+