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_PUBLIC_VOLUME_H 18 #define ANDROID_VOLD_PUBLIC_VOLUME_H 19 20 #include "VolumeBase.h" 21 22 #include <cutils/multiuser.h> 23 24 namespace android { 25 namespace vold { 26 27 /* 28 * Shared storage provided by public (vfat) partition. 29 * 30 * Knows how to mount itself and then spawn a FUSE daemon to synthesize 31 * permissions. AsecVolume and ObbVolume can be stacked above it. 32 * 33 * This volume is not inherently multi-user aware, so it has two possible 34 * modes of operation: 35 * 1. If primary storage for the device, it only binds itself to the 36 * owner user. 37 * 2. If secondary storage, it binds itself for all users, but masks 38 * away the Android directory for secondary users. 39 */ 40 class PublicVolume : public VolumeBase { 41 public: 42 explicit PublicVolume(dev_t device); 43 virtual ~PublicVolume(); 44 45 protected: 46 status_t doCreate() override; 47 status_t doDestroy() override; 48 status_t doMount() override; 49 status_t doUnmount() override; 50 status_t doFormat(const std::string& fsType) override; 51 52 status_t readMetadata(); 53 status_t initAsecStage(); 54 55 private: 56 /* Kernel device representing partition */ 57 dev_t mDevice; 58 /* Block device path */ 59 std::string mDevPath; 60 /* Mount point of raw partition */ 61 std::string mRawPath; 62 63 std::string mFuseDefault; 64 std::string mFuseRead; 65 std::string mFuseWrite; 66 std::string mFuseFull; 67 68 /* PID of FUSE wrapper */ 69 pid_t mFusePid; 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(PublicVolume); 79 }; 80 81 } // namespace vold 82 } // namespace android 83 84 #endif 85