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 std::string& keyRaw); 41 virtual ~PrivateVolume(); 42 43 protected: 44 status_t doCreate() override; 45 status_t doDestroy() override; 46 status_t doMount() override; 47 status_t doUnmount() override; 48 status_t doFormat(const std::string& fsType) override; 49 50 status_t readMetadata(); 51 52 private: 53 /* Kernel device of raw, encrypted partition */ 54 dev_t mRawDevice; 55 /* Path to raw, encrypted block device */ 56 std::string mRawDevPath; 57 /* Path to decrypted block device */ 58 std::string mDmDevPath; 59 /* Path where decrypted device is mounted */ 60 std::string mPath; 61 62 /* Encryption key as raw bytes */ 63 std::string mKeyRaw; 64 65 /* Filesystem type */ 66 std::string mFsType; 67 /* Filesystem UUID */ 68 std::string mFsUuid; 69 /* User-visible filesystem label */ 70 std::string mFsLabel; 71 72 DISALLOW_COPY_AND_ASSIGN(PrivateVolume); 73 }; 74 75 } // namespace vold 76 } // namespace android 77 78 #endif 79