1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_VOLD_PRIVATE_VOLUME_H 18 #define ANDROID_VOLD_PRIVATE_VOLUME_H 19 20 #include "VolumeBase.h" 21 22 #include <cutils/multiuser.h> 23 24 namespace android { 25 namespace vold { 26 27 /* 28 * Private storage provided by an encrypted partition. 29 * 30 * Given a raw block device, it knows how to wrap it in dm-crypt and 31 * format as ext4/f2fs. EmulatedVolume can be stacked above it. 32 * 33 * This volume is designed to behave much like the internal /data 34 * partition, both in layout and function. For example, apps and 35 * private app data can be safely stored on this volume because the 36 * keys are tightly tied to this device. 37 */ 38 class PrivateVolume : public VolumeBase { 39 public: 40 PrivateVolume(dev_t device, const KeyBuffer& keyRaw); 41 virtual ~PrivateVolume(); getFsType()42 const std::string& getFsType() const { return mFsType; }; getRawDevPath()43 const std::string& getRawDevPath() const { return mRawDevPath; }; getRawDmDevPath()44 const std::string& getRawDmDevPath() const { return mDmDevPath; }; getFsUuid()45 const std::string& getFsUuid() const { return mFsUuid; }; getRawDevice()46 dev_t getRawDevice() const { return mRawDevice; }; 47 48 protected: 49 status_t doCreate() override; 50 status_t doDestroy() override; 51 status_t doMount() override; 52 void doPostMount() override; 53 status_t doUnmount() override; 54 status_t doFormat(const std::string& fsType) override; 55 56 status_t readMetadata(); 57 58 private: 59 /* Kernel device of raw, encrypted partition */ 60 dev_t mRawDevice; 61 /* Path to raw, encrypted block device */ 62 std::string mRawDevPath; 63 /* Path to decrypted block device */ 64 std::string mDmDevPath; 65 /* Path where decrypted device is mounted */ 66 std::string mPath; 67 68 /* Encryption key as raw bytes */ 69 KeyBuffer mKeyRaw; 70 71 /* Filesystem type */ 72 std::string mFsType; 73 /* Filesystem UUID */ 74 std::string mFsUuid; 75 /* User-visible filesystem label */ 76 std::string mFsLabel; 77 78 DISALLOW_COPY_AND_ASSIGN(PrivateVolume); 79 }; 80 81 } // namespace vold 82 } // namespace android 83 84 #endif 85