1 /* 2 * Copyright (C) 2008 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_VOLUME_MANAGER_H 18 #define ANDROID_VOLD_VOLUME_MANAGER_H 19 20 #include <pthread.h> 21 #include <fnmatch.h> 22 #include <stdlib.h> 23 24 #include <list> 25 #include <mutex> 26 #include <string> 27 #include <unordered_map> 28 #include <unordered_set> 29 30 #include <android-base/unique_fd.h> 31 #include <cutils/multiuser.h> 32 #include <utils/List.h> 33 #include <utils/Timers.h> 34 #include <sysutils/NetlinkEvent.h> 35 36 #include "android/os/IVoldListener.h" 37 38 #include "model/Disk.h" 39 #include "model/VolumeBase.h" 40 41 #define DEBUG_APPFUSE 0 42 43 class VolumeManager { 44 private: 45 static VolumeManager *sInstance; 46 47 bool mDebug; 48 49 public: 50 virtual ~VolumeManager(); 51 52 // TODO: pipe all requests through VM to avoid exposing this lock getLock()53 std::mutex& getLock() { return mLock; } getCryptLock()54 std::mutex& getCryptLock() { return mCryptLock; } 55 setListener(android::sp<android::os::IVoldListener> listener)56 void setListener(android::sp<android::os::IVoldListener> listener) { mListener = listener; } getListener()57 android::sp<android::os::IVoldListener> getListener() { return mListener; } 58 59 int start(); 60 int stop(); 61 62 void handleBlockEvent(NetlinkEvent *evt); 63 64 class DiskSource { 65 public: DiskSource(const std::string & sysPattern,const std::string & nickname,int flags)66 DiskSource(const std::string& sysPattern, const std::string& nickname, int flags) : 67 mSysPattern(sysPattern), mNickname(nickname), mFlags(flags) { 68 } 69 matches(const std::string & sysPath)70 bool matches(const std::string& sysPath) { 71 return !fnmatch(mSysPattern.c_str(), sysPath.c_str(), 0); 72 } 73 getNickname()74 const std::string& getNickname() { return mNickname; } getFlags()75 int getFlags() { return mFlags; } 76 77 private: 78 std::string mSysPattern; 79 std::string mNickname; 80 int mFlags; 81 }; 82 83 void addDiskSource(const std::shared_ptr<DiskSource>& diskSource); 84 85 std::shared_ptr<android::vold::Disk> findDisk(const std::string& id); 86 std::shared_ptr<android::vold::VolumeBase> findVolume(const std::string& id); 87 88 void listVolumes(android::vold::VolumeBase::Type type, std::list<std::string>& list); 89 90 int forgetPartition(const std::string& partGuid, const std::string& fsUuid); 91 92 int onUserAdded(userid_t userId, int userSerialNumber); 93 int onUserRemoved(userid_t userId); 94 int onUserStarted(userid_t userId); 95 int onUserStopped(userid_t userId); 96 97 int onSecureKeyguardStateChanged(bool isShowing); 98 99 int setPrimary(const std::shared_ptr<android::vold::VolumeBase>& vol); 100 101 int remountUid(uid_t uid, const std::string& mode); 102 103 /* Reset all internal state, typically during framework boot */ 104 int reset(); 105 /* Prepare for device shutdown, safely unmounting all devices */ 106 int shutdown(); 107 /* Unmount all volumes, usually for encryption */ 108 int unmountAll(); 109 110 int updateVirtualDisk(); 111 int setDebug(bool enable); 112 113 static VolumeManager *Instance(); 114 115 /* 116 * Ensure that all directories along given path exist, creating parent 117 * directories as needed. Validates that given path is absolute and that 118 * it contains no relative "." or ".." paths or symlinks. Last path segment 119 * is treated as filename and ignored, unless the path ends with "/". Also 120 * ensures that path belongs to a volume managed by vold. 121 */ 122 int mkdirs(const std::string& path); 123 124 int createObb(const std::string& path, const std::string& key, int32_t ownerGid, 125 std::string* outVolId); 126 int destroyObb(const std::string& volId); 127 128 int mountAppFuse(uid_t uid, pid_t pid, int mountId, android::base::unique_fd* device_fd); 129 int unmountAppFuse(uid_t uid, pid_t pid, int mountId); 130 131 private: 132 VolumeManager(); 133 void readInitialState(); 134 135 int linkPrimary(userid_t userId); 136 137 void handleDiskAdded(const std::shared_ptr<android::vold::Disk>& disk); 138 void handleDiskChanged(dev_t device); 139 void handleDiskRemoved(dev_t device); 140 141 std::mutex mLock; 142 std::mutex mCryptLock; 143 144 android::sp<android::os::IVoldListener> mListener; 145 146 std::list<std::shared_ptr<DiskSource>> mDiskSources; 147 std::list<std::shared_ptr<android::vold::Disk>> mDisks; 148 std::list<std::shared_ptr<android::vold::Disk>> mPendingDisks; 149 std::list<std::shared_ptr<android::vold::VolumeBase>> mObbVolumes; 150 151 std::unordered_map<userid_t, int> mAddedUsers; 152 std::unordered_set<userid_t> mStartedUsers; 153 154 std::string mVirtualDiskPath; 155 std::shared_ptr<android::vold::Disk> mVirtualDisk; 156 std::shared_ptr<android::vold::VolumeBase> mInternalEmulated; 157 std::shared_ptr<android::vold::VolumeBase> mPrimary; 158 159 int mNextObbId; 160 bool mSecureKeyguardShowing; 161 }; 162 163 #endif 164