test_librbd:add a test case of 70 key/val pairs in TestClone2

Signed-off-by: PCzhangPC <pengcheng.zhang@easystack.cn>

src/test/librbd/test_librbd.cc

@@ -2705,6 +2705,28 @@ TEST_F(TestLibRBD, TestClone2)
   ASSERT_EQ(-ENOENT, rbd_get_parent_info(parent, NULL, 0, NULL, 0, NULL, 0));
   printf("parent has no parent info\n");
 
+  // create 70 metadatas to verify we can clone all key/value pairs
+  std::string key;
+  std::string val;
+  size_t sum_key_len = 0;
+  size_t sum_value_len = 0;
+  for (int i = 1; i <= 70; i++) {
+    key = "key" + stringify(i);
+    val = "value" + stringify(i);
+    ASSERT_EQ(0, rbd_metadata_set(parent, key.c_str(), val.c_str()));
+
+    sum_key_len += (key.size() + 1);
+    sum_value_len += (val.size() + 1);
+  }
+
+  char keys[1024];
+  char vals[1024];
+  size_t keys_len = sizeof(keys);
+  size_t vals_len = sizeof(vals);
+
+  char value[1024];
+  size_t value_len = sizeof(value);
+
   // create a snapshot, reopen as the parent we're interested in
   ASSERT_EQ(0, rbd_snap_create(parent, "parent_snap"));
   printf("made snapshot \"parent@parent_snap\"\n");
@@ -2729,6 +2751,22 @@ TEST_F(TestLibRBD, TestClone2)
   ASSERT_EQ(0, rbd_open(ioctx, child_name.c_str(), &child, NULL));
   printf("made and opened clone \"child\"\n");
 
+  // check key/value pairs in child image
+  ASSERT_EQ(0, rbd_metadata_list(child, "", 70, keys, &keys_len, vals,
+                                 &vals_len));
+  ASSERT_EQ(sum_key_len, keys_len);
+  ASSERT_EQ(sum_value_len, vals_len);
+
+  for (int i = 1; i <= 70; i++) {
+    key = "key" + stringify(i);
+    val = "value" + stringify(i);
+    ASSERT_EQ(0, rbd_metadata_get(child, key.c_str(), value, &value_len));
+    ASSERT_STREQ(val.c_str(), value);
+
+    value_len = sizeof(value);
+  }
+  printf("child image successfully cloned all image-meta pairs\n");
+
   // write something in
   ASSERT_EQ((ssize_t)strlen(childata), rbd_write(child, 20, strlen(childata), childata));