243 lines
8.6 KiB
C++
243 lines
8.6 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_VOLD_VOLUME_MANAGER_H
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#define ANDROID_VOLD_VOLUME_MANAGER_H
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#include <fnmatch.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <list>
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#include <mutex>
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#include <set>
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#include <string>
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#include <unordered_map>
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#include <unordered_set>
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#include <android-base/unique_fd.h>
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#include <cutils/multiuser.h>
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#include <sysutils/NetlinkEvent.h>
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#include <utils/List.h>
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#include <utils/Timers.h>
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#include "android/os/IVoldListener.h"
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#include "model/Disk.h"
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#include "model/VolumeBase.h"
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class VolumeManager {
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private:
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static VolumeManager* sInstance;
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bool mDebug;
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public:
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virtual ~VolumeManager();
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// TODO: pipe all requests through VM to avoid exposing this lock
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std::mutex& getLock() { return mLock; }
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std::mutex& getCryptLock() { return mCryptLock; }
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void setListener(android::sp<android::os::IVoldListener> listener) { mListener = listener; }
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android::sp<android::os::IVoldListener> getListener() const { return mListener; }
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int start();
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void handleBlockEvent(NetlinkEvent* evt);
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class DiskSource {
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public:
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DiskSource(const std::string& sysPattern, const std::string& nickname, int flags)
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: mSysPattern(sysPattern), mNickname(nickname), mFlags(flags) {}
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bool matches(const std::string& sysPath) {
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return !fnmatch(mSysPattern.c_str(), sysPath.c_str(), 0);
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}
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const std::string& getNickname() const { return mNickname; }
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int getFlags() const { return mFlags; }
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private:
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std::string mSysPattern;
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std::string mNickname;
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int mFlags;
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};
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void addDiskSource(const std::shared_ptr<DiskSource>& diskSource);
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std::shared_ptr<android::vold::Disk> findDisk(const std::string& id);
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std::shared_ptr<android::vold::VolumeBase> findVolume(const std::string& id);
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template <typename Fn>
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std::shared_ptr<android::vold::VolumeBase> findVolumeWithFilter(Fn fn) {
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for (const auto& vol : mInternalEmulatedVolumes) {
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if (fn(*vol)) {
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return vol;
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}
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}
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for (const auto& disk : mDisks) {
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for (const auto& vol : disk->getVolumes()) {
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if (fn(*vol)) {
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return vol;
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}
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}
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}
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return nullptr;
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}
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void listVolumes(android::vold::VolumeBase::Type type, std::list<std::string>& list) const;
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const std::set<userid_t>& getStartedUsers() const { return mStartedUsers; }
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int forgetPartition(const std::string& partGuid, const std::string& fsUuid);
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int onUserAdded(userid_t userId, int userSerialNumber);
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int onUserRemoved(userid_t userId);
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int onUserStarted(userid_t userId);
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int onUserStopped(userid_t userId);
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void createPendingDisksIfNeeded();
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int onSecureKeyguardStateChanged(bool isShowing);
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int remountUid(uid_t uid, int32_t remountMode) { return 0; }
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int handleAppStorageDirs(int uid, int pid,
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bool doUnmount, const std::vector<std::string>& packageNames);
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/* Aborts all FUSE filesystems, in case the FUSE daemon is no longer up. */
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int abortFuse();
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/* Reset all internal state, typically during framework boot */
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int reset();
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/* Prepare for device shutdown, safely unmounting all devices */
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int shutdown();
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/* Unmount all volumes, usually for encryption */
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int unmountAll();
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int updateVirtualDisk();
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int setDebug(bool enable);
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bool forkAndRemountStorage(int uid, int pid, bool doUnmount,
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const std::vector<std::string>& packageNames);
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static VolumeManager* Instance();
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/*
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* Creates a directory 'path' for an application, automatically creating
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* directories along the given path if they don't exist yet.
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*
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* Example:
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* path = /storage/emulated/0/Android/data/com.foo/files/
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*
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* This function will first match the first part of the path with the volume
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* root of any known volumes; in this case, "/storage/emulated/0" matches
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* with the volume root of the emulated volume for user 0.
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*
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* The subseqent part of the path must start with one of the well-known
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* Android/ data directories, /Android/data, /Android/obb or
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* /Android/media.
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*
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* The final part of the path is application specific. This function will
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* create all directories, including the application-specific ones, and
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* set the UID of all app-specific directories below the well-known data
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* directories to the 'appUid' argument. In the given example, the UID
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* of /storage/emulated/0/Android/data/com.foo and
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* /storage/emulated/0/Android/data/com.foo/files would be set to 'appUid'.
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*
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* The UID/GID of the parent directories will be set according to the
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* requirements of the underlying filesystem and are of no concern to the
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* caller.
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*
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* If fixupExistingOnly is set, we make sure to fixup any existing dirs and
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* files in the passed in path, but only if that path exists; if it doesn't
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* exist, this function doesn't create them.
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*
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* If skipIfDirExists is set, we will not fix any existing dirs, we will
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* only create app dirs if it doesn't exist.
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*
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* Validates that given paths are absolute and that they contain no relative
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* "." or ".." paths or symlinks. Last path segment is treated as filename
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* and ignored, unless the path ends with "/". Also ensures that path
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* belongs to a volume managed by vold.
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*/
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int setupAppDir(const std::string& path, int32_t appUid, bool fixupExistingOnly = false,
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bool skipIfDirExists = false);
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/**
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* Fixes up an existing application directory, as if it was created with
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* setupAppDir() above. This includes fixing up the UID/GID, permissions and
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* project IDs of the contained files and directories.
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*/
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int fixupAppDir(const std::string& path, int32_t appUid);
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// Called before zygote starts to ensure dir exists so zygote can bind mount them.
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int ensureAppDirsCreated(const std::vector<std::string>& paths, int32_t appUid);
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int createObb(const std::string& path, const std::string& key, int32_t ownerGid,
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std::string* outVolId);
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int destroyObb(const std::string& volId);
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int createStubVolume(const std::string& sourcePath, const std::string& mountPath,
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const std::string& fsType, const std::string& fsUuid,
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const std::string& fsLabel, int32_t flags, std::string* outVolId);
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int destroyStubVolume(const std::string& volId);
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int mountAppFuse(uid_t uid, int mountId, android::base::unique_fd* device_fd);
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int unmountAppFuse(uid_t uid, int mountId);
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int openAppFuseFile(uid_t uid, int mountId, int fileId, int flags);
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private:
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VolumeManager();
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void readInitialState();
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int linkPrimary(userid_t userId);
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void createEmulatedVolumesForUser(userid_t userId);
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void destroyEmulatedVolumesForUser(userid_t userId);
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void handleDiskAdded(const std::shared_ptr<android::vold::Disk>& disk);
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void handleDiskChanged(dev_t device);
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void handleDiskRemoved(dev_t device);
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bool updateFuseMountedProperty();
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std::mutex mLock;
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std::mutex mCryptLock;
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android::sp<android::os::IVoldListener> mListener;
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std::list<std::shared_ptr<DiskSource>> mDiskSources;
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std::list<std::shared_ptr<android::vold::Disk>> mDisks;
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std::list<std::shared_ptr<android::vold::Disk>> mPendingDisks;
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std::list<std::shared_ptr<android::vold::VolumeBase>> mObbVolumes;
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std::list<std::shared_ptr<android::vold::VolumeBase>> mInternalEmulatedVolumes;
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std::unordered_map<userid_t, int> mAddedUsers;
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// This needs to be a regular set because we care about the ordering here;
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// user 0 should always go first, because it is responsible for sdcardfs.
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std::set<userid_t> mStartedUsers;
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std::string mVirtualDiskPath;
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std::shared_ptr<android::vold::Disk> mVirtualDisk;
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std::shared_ptr<android::vold::VolumeBase> mPrimary;
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int mNextObbId;
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int mNextStubId;
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bool mSecureKeyguardShowing;
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};
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#endif
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