Don't corrupt ssd when encrypting and power fails

Stop encryption when battery is low, mark position, and continue on reboot.

Note - support for multiple encrypted volumes removed as no devices seem
to exist with an fstab that uses this feature. If you want support for such
a device, contact me and we will re-add it with appropriate testing.

Bug: 13284213
Change-Id: I1f7178e4f7dd8ea816cbc03ab5c4f6543e98acaa
diff --git a/CheckBattery.h b/CheckBattery.h
new file mode 100644
index 0000000..a7bff34
--- /dev/null
+++ b/CheckBattery.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _CHECKBATTERY_H__
+#define _CHECKBATTERY_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int is_battery_ok();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif