recovery: Implement a volume manager
This is a copy of the pre-binderized vold which has been converted to
use direct calls instead of sockets and stripped down to only what is
needed to support recovery.
Change-Id: Ic82d929e052b5ba70ecf7b475e0a223d77d9687e
diff --git a/volume_manager/EmulatedVolume.h b/volume_manager/EmulatedVolume.h
new file mode 100644
index 0000000..ac40b6f
--- /dev/null
+++ b/volume_manager/EmulatedVolume.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2019 The LineageOS 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 ANDROID_VOLMGR_EMULATED_VOLUME_H
+#define ANDROID_VOLMGR_EMULATED_VOLUME_H
+
+#include "VolumeBase.h"
+
+#include <cutils/multiuser.h>
+#include <fstab/fstab.h>
+
+using android::fs_mgr::FstabEntry;
+
+namespace android {
+namespace volmgr {
+
+/*
+ * Shared storage emulated on top of private storage.
+ *
+ * Knows how to spawn a FUSE daemon to synthesize permissions. ObbVolume
+ * can be stacked above it.
+ *
+ * This volume is always multi-user aware, but is only binds itself to
+ * users when its primary storage. This volume should never be presented
+ * as secondary storage, since we're strongly encouraging developers to
+ * store data local to their app.
+ */
+class EmulatedVolume : public VolumeBase {
+ public:
+ explicit EmulatedVolume(FstabEntry* rec, const std::string& subdir);
+ virtual ~EmulatedVolume();
+
+ protected:
+ status_t doMount() override;
+ status_t doUnmount(bool detach = false) override;
+
+ private:
+ std::string mSubdir;
+ std::string mDevPath;
+ std::string mFsType;
+ unsigned long mFlags;
+ std::string mFsOptions;
+
+ DISALLOW_COPY_AND_ASSIGN(EmulatedVolume);
+};
+
+} // namespace volmgr
+} // namespace android
+
+#endif