Try to unmount writable filesystems when rebooting
Ext4 filesystems like to be unmounted before rebooting. The Android system
doesn't have a traditional Linux init setup, and shutting down the system
was not much more than calling sync(2) and reboot(2). This adds a new
function to libcutils called android_reboot(). By default, it calls sync()
and then remounts all writable filesystems as read-only and marks them clean.
There is a flag parameter in which the caller can ask for sync() not to be
called, or to not remount the filesystems as read-only. Then it will call
reboot(2) as directed by the other parameters. This change also updates
adb, init and toolbox to call the new android_reboot() function.
Fixes bugs 3350709 and 3495575.
Change-Id: I16d71ffce3134310d7a260f61ec6f4dd204124a7
diff --git a/include/cutils/android_reboot.h b/include/cutils/android_reboot.h
new file mode 100644
index 0000000..0c79be7
--- /dev/null
+++ b/include/cutils/android_reboot.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2011, 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 __CUTILS_ANDROID_REBOOT_H__
+#define __CUTILS_ANDROID_REBOOT_H__
+
+__BEGIN_DECLS
+
+/* Commands */
+#define ANDROID_RB_RESTART 0xDEAD0001
+#define ANDROID_RB_POWEROFF 0xDEAD0002
+#define ANDROID_RB_RESTART2 0xDEAD0003
+
+/* Flags */
+#define ANDROID_RB_FLAG_NO_SYNC 0x1
+#define ANDROID_RB_FLAG_NO_REMOUNT_RO 0x2
+
+int android_reboot(int cmd, int flags, char *arg);
+
+__END_DECLS
+
+#endif /* __CUTILS_ANDROID_REBOOT_H__ */