diff --git a/VolumeBase.cpp b/VolumeBase.cpp
new file mode 100644
index 0000000..307791d
--- /dev/null
+++ b/VolumeBase.cpp
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#define LOG_TAG "Vold"
+
+#include "Utils.h"
+#include "VolumeBase.h"
+
+#include <cutils/log.h>
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+namespace android {
+namespace vold {
+
+VolumeBase::VolumeBase(VolumeType type) :
+        mType(type), mState(VolumeState::kUnmounted) {
+}
+
+VolumeBase::~VolumeBase() {
+}
+
+void VolumeBase::setState(VolumeState state) {
+    mState = state;
+
+    // TODO: publish state up to framework
+}
+
+void VolumeBase::stackVolume(const std::shared_ptr<VolumeBase>& volume) {
+    mStacked.push_back(volume);
+}
+
+void VolumeBase::unstackVolume(const std::shared_ptr<VolumeBase>& volume) {
+    mStacked.remove(volume);
+}
+
+status_t VolumeBase::mount() {
+    if (getState() != VolumeState::kUnmounted) {
+        SLOGE("Must be unmounted to mount %s", getId().c_str());
+        return -EBUSY;
+    }
+
+    setState(VolumeState::kMounting);
+    status_t res = doMount();
+    if (!res) {
+        setState(VolumeState::kMounted);
+    } else {
+        setState(VolumeState::kCorrupt);
+    }
+
+    return res;
+}
+
+status_t VolumeBase::unmount() {
+    if (getState() != VolumeState::kMounted) {
+        SLOGE("Must be mounted to unmount %s", getId().c_str());
+        return -EBUSY;
+    }
+
+    setState(VolumeState::kUnmounting);
+
+    for (std::string target : mBindTargets) {
+        ForceUnmount(target);
+    }
+    mBindTargets.clear();
+
+    for (std::shared_ptr<VolumeBase> v : mStacked) {
+        if (v->unmount()) {
+            ALOGW("Failed to unmount %s stacked above %s", v->getId().c_str(),
+                    getId().c_str());
+        }
+    }
+    mStacked.clear();
+
+    status_t res = doUnmount();
+    setState(VolumeState::kUnmounted);
+    return res;
+}
+
+status_t VolumeBase::format() {
+    if (getState() != VolumeState::kUnmounted
+            || getState() != VolumeState::kCorrupt) {
+        SLOGE("Must be unmounted or corrupt to format %s", getId().c_str());
+        return -EBUSY;
+    }
+
+    setState(VolumeState::kFormatting);
+    status_t res = doFormat();
+    setState(VolumeState::kUnmounted);
+    return res;
+}
+
+status_t VolumeBase::doFormat() {
+    return -ENOTSUP;
+}
+
+status_t VolumeBase::mountBind(const std::string& source, const std::string& target) {
+    if (::mount(source.c_str(), target.c_str(), "", MS_BIND, NULL)) {
+        SLOGE("Failed to bind mount %s to %s: %s", source.c_str(),
+                target.c_str(), strerror(errno));
+        return -errno;
+    }
+    mBindTargets.push_back(target);
+    return OK;
+}
+
+status_t VolumeBase::unmountBind(const std::string& target) {
+    ForceUnmount(target);
+    mBindTargets.remove(target);
+    return OK;
+}
+
+}  // namespace vold
+}  // namespace android