diff --git a/Checkpoint.cpp b/Checkpoint.cpp
index 1833733..8f86174 100644
--- a/Checkpoint.cpp
+++ b/Checkpoint.cpp
@@ -66,7 +66,7 @@ bool setBowState(std::string const& block_device, std::string const& state) {
 
 bool cp_startCheckpoint(int retry) {
     if (retry < -1) return false;
-    std::string content = std::to_string(retry);
+    std::string content = std::to_string(retry + 1);
     if (retry == -1) {
         sp<IBootControl> module = IBootControl::getService();
         if (module) {
@@ -136,7 +136,7 @@ bool cp_needsRollback() {
     return false;
 }
 
-bool cp_needsCheckpoint(void) {
+bool cp_needsCheckpoint() {
     bool ret;
     std::string content;
     sp<IBootControl> module = IBootControl::getService();
@@ -148,7 +148,7 @@ bool cp_needsCheckpoint(void) {
     return false;
 }
 
-bool cp_prepareDriveForCheckpoint(const std::string&) {
+bool cp_prepareCheckpoint() {
     auto fstab_default = std::unique_ptr<fstab, decltype(&fs_mgr_free_fstab)>{
         fs_mgr_read_fstab_default(), fs_mgr_free_fstab};
     if (!fstab_default) return false;
diff --git a/Checkpoint.h b/Checkpoint.h
index 54574a7..f3554cc 100644
--- a/Checkpoint.h
+++ b/Checkpoint.h
@@ -32,7 +32,7 @@ bool cp_needsRollback();
 
 bool cp_needsCheckpoint();
 
-bool cp_prepareDriveForCheckpoint(const std::string& mountPoint);
+bool cp_prepareCheckpoint();
 
 bool cp_restoreCheckpoint(const std::string& mountPoint);
 
diff --git a/VoldNativeService.cpp b/VoldNativeService.cpp
index 3884875..4a9ed5b 100644
--- a/VoldNativeService.cpp
+++ b/VoldNativeService.cpp
@@ -797,13 +797,11 @@ binder::Status VoldNativeService::commitChanges(bool* _aidl_return) {
     return ok();
 }
 
-binder::Status VoldNativeService::prepareDriveForCheckpoint(const std::string& mountPoint,
-                                                            bool* _aidl_return) {
+binder::Status VoldNativeService::prepareCheckpoint(bool* _aidl_return) {
     ENFORCE_UID(AID_SYSTEM);
-    CHECK_ARGUMENT_PATH(mountPoint);
     ACQUIRE_LOCK;
 
-    *_aidl_return = cp_prepareDriveForCheckpoint(mountPoint);
+    *_aidl_return = cp_prepareCheckpoint();
     return ok();
 }
 
diff --git a/VoldNativeService.h b/VoldNativeService.h
index 594c002..3bc07b6 100644
--- a/VoldNativeService.h
+++ b/VoldNativeService.h
@@ -118,7 +118,7 @@ class VoldNativeService : public BinderService<VoldNativeService>, public os::Bn
     binder::Status needsCheckpoint(bool* _aidl_return);
     binder::Status needsRollback(bool* _aidl_return);
     binder::Status commitChanges(bool* _aidl_return);
-    binder::Status prepareDriveForCheckpoint(const std::string& mountPoint, bool* _aidl_return);
+    binder::Status prepareCheckpoint(bool* _aidl_return);
     binder::Status restoreCheckpoint(const std::string& mountPoint, bool* _aidl_return);
     binder::Status markBootAttempt(bool* __aidl_return);
     binder::Status abortChanges();
diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index 27330fe..c95d5ad 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -101,7 +101,7 @@ interface IVold {
     boolean needsRollback();
     void abortChanges();
     boolean commitChanges();
-    boolean prepareDriveForCheckpoint(@utf8InCpp String mountPoint);
+    boolean prepareCheckpoint();
     boolean restoreCheckpoint(@utf8InCpp String device);
     boolean markBootAttempt();
 
diff --git a/vdc.cpp b/vdc.cpp
index 5e2c37a..6efd72c 100644
--- a/vdc.cpp
+++ b/vdc.cpp
@@ -123,10 +123,9 @@ int main(int argc, char** argv) {
         bool success = false;
         checkStatus(vold->commitChanges(&success));
         return success ? 1 : 0;
-    } else if (args[0] == "checkpoint" && args[1] == "prepareDriveForCheckpoint" &&
-               args.size() == 3) {
+    } else if (args[0] == "checkpoint" && args[1] == "prepareCheckpoint" && args.size() == 2) {
         bool success = false;
-        checkStatus(vold->prepareDriveForCheckpoint(args[2], &success));
+        checkStatus(vold->prepareCheckpoint(&success));
         return success ? 1 : 0;
     } else if (args[0] == "checkpoint" && args[1] == "restoreCheckpoint" && args.size() == 3) {
         bool success = false;