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Diffstat (limited to 'services/incremental/IncrementalService.cpp')
| -rw-r--r-- | services/incremental/IncrementalService.cpp | 1040 |
1 files changed, 1040 insertions, 0 deletions
diff --git a/services/incremental/IncrementalService.cpp b/services/incremental/IncrementalService.cpp new file mode 100644 index 000000000000..c43328fcdf9d --- /dev/null +++ b/services/incremental/IncrementalService.cpp @@ -0,0 +1,1040 @@ +/* + * Copyright (C) 2019 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define LOG_TAG "IncrementalService" + +#include "IncrementalService.h" + +#include <android-base/file.h> +#include <android-base/logging.h> +#include <android-base/properties.h> +#include <android-base/stringprintf.h> +#include <android-base/strings.h> +#include <android/content/pm/IDataLoaderStatusListener.h> +#include <android/os/IVold.h> +#include <androidfw/ZipFileRO.h> +#include <androidfw/ZipUtils.h> +#include <binder/BinderService.h> +#include <binder/ParcelFileDescriptor.h> +#include <binder/Status.h> +#include <sys/stat.h> +#include <uuid/uuid.h> +#include <zlib.h> + +#include <iterator> +#include <span> +#include <stack> +#include <thread> +#include <type_traits> + +#include "Metadata.pb.h" + +using namespace std::literals; +using namespace android::content::pm; + +namespace android::incremental { + +namespace { + +using IncrementalFileSystemControlParcel = + ::android::os::incremental::IncrementalFileSystemControlParcel; + +struct Constants { + static constexpr auto backing = "backing_store"sv; + static constexpr auto mount = "mount"sv; + static constexpr auto image = "incfs.img"sv; + static constexpr auto storagePrefix = "st"sv; + static constexpr auto mountpointMdPrefix = ".mountpoint."sv; + static constexpr auto infoMdName = ".info"sv; +}; + +static const Constants& constants() { + static Constants c; + return c; +} + +template <base::LogSeverity level = base::ERROR> +bool mkdirOrLog(std::string_view name, int mode = 0770, bool allowExisting = true) { + auto cstr = path::c_str(name); + if (::mkdir(cstr, mode)) { + if (errno != EEXIST) { + PLOG(level) << "Can't create directory '" << name << '\''; + return false; + } + struct stat st; + if (::stat(cstr, &st) || !S_ISDIR(st.st_mode)) { + PLOG(level) << "Path exists but is not a directory: '" << name << '\''; + return false; + } + } + return true; +} + +static std::string toMountKey(std::string_view path) { + if (path.empty()) { + return "@none"; + } + if (path == "/"sv) { + return "@root"; + } + if (path::isAbsolute(path)) { + path.remove_prefix(1); + } + std::string res(path); + std::replace(res.begin(), res.end(), '/', '_'); + std::replace(res.begin(), res.end(), '@', '_'); + return res; +} + +static std::pair<std::string, std::string> makeMountDir(std::string_view incrementalDir, + std::string_view path) { + auto mountKey = toMountKey(path); + const auto prefixSize = mountKey.size(); + for (int counter = 0; counter < 1000; + mountKey.resize(prefixSize), base::StringAppendF(&mountKey, "%d", counter++)) { + auto mountRoot = path::join(incrementalDir, mountKey); + if (mkdirOrLog(mountRoot, 0770, false)) { + return {mountKey, mountRoot}; + } + } + return {}; +} + +template <class ProtoMessage, class Control> +static ProtoMessage parseFromIncfs(const IncFsWrapper* incfs, Control&& control, + std::string_view path) { + struct stat st; + if (::stat(path::c_str(path), &st)) { + return {}; + } + auto md = incfs->getMetadata(control, st.st_ino); + ProtoMessage message; + return message.ParseFromArray(md.data(), md.size()) ? message : ProtoMessage{}; +} + +static bool isValidMountTarget(std::string_view path) { + return path::isAbsolute(path) && path::isEmptyDir(path).value_or(true); +} + +std::string makeBindMdName() { + static constexpr auto uuidStringSize = 36; + + uuid_t guid; + uuid_generate(guid); + + std::string name; + const auto prefixSize = constants().mountpointMdPrefix.size(); + name.reserve(prefixSize + uuidStringSize); + + name = constants().mountpointMdPrefix; + name.resize(prefixSize + uuidStringSize); + uuid_unparse(guid, name.data() + prefixSize); + + return name; +} +} // namespace + +IncrementalService::IncFsMount::~IncFsMount() { + incrementalService.mIncrementalManager->destroyDataLoader(mountId); + control.reset(); + LOG(INFO) << "Unmounting and cleaning up mount " << mountId << " with root '" << root << '\''; + for (auto&& [target, _] : bindPoints) { + LOG(INFO) << "\tbind: " << target; + incrementalService.mVold->unmountIncFs(target); + } + LOG(INFO) << "\troot: " << root; + incrementalService.mVold->unmountIncFs(path::join(root, constants().mount)); + cleanupFilesystem(root); +} + +auto IncrementalService::IncFsMount::makeStorage(StorageId id) -> StorageMap::iterator { + metadata::Storage st; + st.set_id(id); + auto metadata = st.SerializeAsString(); + + std::string name; + for (int no = nextStorageDirNo.fetch_add(1, std::memory_order_relaxed), i = 0; + i < 1024 && no >= 0; no = nextStorageDirNo.fetch_add(1, std::memory_order_relaxed), ++i) { + name.clear(); + base::StringAppendF(&name, "%.*s%d", int(constants().storagePrefix.size()), + constants().storagePrefix.data(), no); + if (auto node = + incrementalService.mIncFs->makeDir(control, name, INCFS_ROOT_INODE, metadata); + node >= 0) { + std::lock_guard l(lock); + return storages.insert_or_assign(id, Storage{std::move(name), node}).first; + } + } + nextStorageDirNo = 0; + return storages.end(); +} + +void IncrementalService::IncFsMount::cleanupFilesystem(std::string_view root) { + ::unlink(path::join(root, constants().backing, constants().image).c_str()); + ::rmdir(path::join(root, constants().backing).c_str()); + ::rmdir(path::join(root, constants().mount).c_str()); + ::rmdir(path::c_str(root)); +} + +IncrementalService::IncrementalService(const ServiceManagerWrapper& sm, std::string_view rootDir) + : mVold(sm.getVoldService()), + mIncrementalManager(sm.getIncrementalManager()), + mIncFs(sm.getIncFs()), + mIncrementalDir(rootDir) { + if (!mVold) { + LOG(FATAL) << "Vold service is unavailable"; + } + if (!mIncrementalManager) { + LOG(FATAL) << "IncrementalManager service is unavailable"; + } + // TODO(b/136132412): check that root dir should already exist + // TODO(b/136132412): enable mount existing dirs after SELinux rules are merged + // mountExistingImages(); +} + +IncrementalService::~IncrementalService() = default; + +std::optional<std::future<void>> IncrementalService::onSystemReady() { + std::promise<void> threadFinished; + if (mSystemReady.exchange(true)) { + return {}; + } + + std::vector<IfsMountPtr> mounts; + { + std::lock_guard l(mLock); + mounts.reserve(mMounts.size()); + for (auto&& [id, ifs] : mMounts) { + if (ifs->mountId == id) { + mounts.push_back(ifs); + } + } + } + + std::thread([this, mounts = std::move(mounts)]() { + std::vector<IfsMountPtr> failedLoaderMounts; + for (auto&& ifs : mounts) { + if (prepareDataLoader(*ifs, nullptr)) { + LOG(INFO) << "Successfully started data loader for mount " << ifs->mountId; + } else { + LOG(WARNING) << "Failed to start data loader for mount " << ifs->mountId; + failedLoaderMounts.push_back(std::move(ifs)); + } + } + + while (!failedLoaderMounts.empty()) { + LOG(WARNING) << "Deleting failed mount " << failedLoaderMounts.back()->mountId; + deleteStorage(*failedLoaderMounts.back()); + failedLoaderMounts.pop_back(); + } + mPrepareDataLoaders.set_value_at_thread_exit(); + }).detach(); + return mPrepareDataLoaders.get_future(); +} + +auto IncrementalService::getStorageSlotLocked() -> MountMap::iterator { + for (;;) { + if (mNextId == kMaxStorageId) { + mNextId = 0; + } + auto id = ++mNextId; + auto [it, inserted] = mMounts.try_emplace(id, nullptr); + if (inserted) { + return it; + } + } +} + +StorageId IncrementalService::createStorage(std::string_view mountPoint, + DataLoaderParamsParcel&& dataLoaderParams, + CreateOptions options) { + LOG(INFO) << "createStorage: " << mountPoint << " | " << int(options); + if (!path::isAbsolute(mountPoint)) { + LOG(ERROR) << "path is not absolute: " << mountPoint; + return kInvalidStorageId; + } + + auto mountNorm = path::normalize(mountPoint); + { + const auto id = findStorageId(mountNorm); + if (id != kInvalidStorageId) { + if (options & CreateOptions::OpenExisting) { + LOG(INFO) << "Opened existing storage " << id; + return id; + } + LOG(ERROR) << "Directory " << mountPoint << " is already mounted at storage " << id; + return kInvalidStorageId; + } + } + + if (!(options & CreateOptions::CreateNew)) { + LOG(ERROR) << "not requirested create new storage, and it doesn't exist: " << mountPoint; + return kInvalidStorageId; + } + + if (!path::isEmptyDir(mountNorm)) { + LOG(ERROR) << "Mounting over existing non-empty directory is not supported: " << mountNorm; + return kInvalidStorageId; + } + auto [mountKey, mountRoot] = makeMountDir(mIncrementalDir, mountNorm); + if (mountRoot.empty()) { + LOG(ERROR) << "Bad mount point"; + return kInvalidStorageId; + } + // Make sure the code removes all crap it may create while still failing. + auto firstCleanup = [](const std::string* ptr) { IncFsMount::cleanupFilesystem(*ptr); }; + auto firstCleanupOnFailure = + std::unique_ptr<std::string, decltype(firstCleanup)>(&mountRoot, firstCleanup); + + auto mountTarget = path::join(mountRoot, constants().mount); + if (!mkdirOrLog(path::join(mountRoot, constants().backing)) || !mkdirOrLog(mountTarget)) { + return kInvalidStorageId; + } + + const auto image = path::join(mountRoot, constants().backing, constants().image); + IncFsMount::Control control; + { + std::lock_guard l(mMountOperationLock); + IncrementalFileSystemControlParcel controlParcel; + auto status = mVold->mountIncFs(image, mountTarget, incfs::truncate, &controlParcel); + if (!status.isOk()) { + LOG(ERROR) << "Vold::mountIncFs() failed: " << status.toString8(); + return kInvalidStorageId; + } + if (!controlParcel.cmd || !controlParcel.log) { + LOG(ERROR) << "Vold::mountIncFs() returned invalid control parcel."; + return kInvalidStorageId; + } + control.cmdFd = controlParcel.cmd->release(); + control.logFd = controlParcel.log->release(); + } + + std::unique_lock l(mLock); + const auto mountIt = getStorageSlotLocked(); + const auto mountId = mountIt->first; + l.unlock(); + + auto ifs = + std::make_shared<IncFsMount>(std::move(mountRoot), mountId, std::move(control), *this); + // Now it's the |ifs|'s responsibility to clean up after itself, and the only cleanup we need + // is the removal of the |ifs|. + firstCleanupOnFailure.release(); + + auto secondCleanup = [this, &l](auto itPtr) { + if (!l.owns_lock()) { + l.lock(); + } + mMounts.erase(*itPtr); + }; + auto secondCleanupOnFailure = + std::unique_ptr<decltype(mountIt), decltype(secondCleanup)>(&mountIt, secondCleanup); + + const auto storageIt = ifs->makeStorage(ifs->mountId); + if (storageIt == ifs->storages.end()) { + LOG(ERROR) << "Can't create default storage directory"; + return kInvalidStorageId; + } + + { + metadata::Mount m; + m.mutable_storage()->set_id(ifs->mountId); + m.mutable_loader()->set_package_name(dataLoaderParams.packageName); + m.mutable_loader()->set_arguments(dataLoaderParams.staticArgs); + const auto metadata = m.SerializeAsString(); + m.mutable_loader()->release_arguments(); + m.mutable_loader()->release_package_name(); + if (auto err = mIncFs->makeFile(ifs->control, constants().infoMdName, INCFS_ROOT_INODE, 0, + metadata); + err < 0) { + LOG(ERROR) << "Saving mount metadata failed: " << -err; + return kInvalidStorageId; + } + } + + const auto bk = + (options & CreateOptions::PermanentBind) ? BindKind::Permanent : BindKind::Temporary; + if (auto err = addBindMount(*ifs, storageIt->first, std::string(storageIt->second.name), + std::move(mountNorm), bk, l); + err < 0) { + LOG(ERROR) << "adding bind mount failed: " << -err; + return kInvalidStorageId; + } + + // Done here as well, all data structures are in good state. + secondCleanupOnFailure.release(); + + if (!prepareDataLoader(*ifs, &dataLoaderParams)) { + LOG(ERROR) << "prepareDataLoader() failed"; + deleteStorageLocked(*ifs, std::move(l)); + return kInvalidStorageId; + } + + mountIt->second = std::move(ifs); + l.unlock(); + LOG(INFO) << "created storage " << mountId; + return mountId; +} + +StorageId IncrementalService::createLinkedStorage(std::string_view mountPoint, + StorageId linkedStorage, + IncrementalService::CreateOptions options) { + if (!isValidMountTarget(mountPoint)) { + LOG(ERROR) << "Mount point is invalid or missing"; + return kInvalidStorageId; + } + + std::unique_lock l(mLock); + const auto& ifs = getIfsLocked(linkedStorage); + if (!ifs) { + LOG(ERROR) << "Ifs unavailable"; + return kInvalidStorageId; + } + + const auto mountIt = getStorageSlotLocked(); + const auto storageId = mountIt->first; + const auto storageIt = ifs->makeStorage(storageId); + if (storageIt == ifs->storages.end()) { + LOG(ERROR) << "Can't create a new storage"; + mMounts.erase(mountIt); + return kInvalidStorageId; + } + + l.unlock(); + + const auto bk = + (options & CreateOptions::PermanentBind) ? BindKind::Permanent : BindKind::Temporary; + if (auto err = addBindMount(*ifs, storageIt->first, std::string(storageIt->second.name), + path::normalize(mountPoint), bk, l); + err < 0) { + LOG(ERROR) << "bindMount failed with error: " << err; + return kInvalidStorageId; + } + + mountIt->second = ifs; + return storageId; +} + +IncrementalService::BindPathMap::const_iterator IncrementalService::findStorageLocked( + std::string_view path) const { + auto bindPointIt = mBindsByPath.upper_bound(path); + if (bindPointIt == mBindsByPath.begin()) { + return mBindsByPath.end(); + } + --bindPointIt; + if (!path::startsWith(path, bindPointIt->first)) { + return mBindsByPath.end(); + } + return bindPointIt; +} + +StorageId IncrementalService::findStorageId(std::string_view path) const { + std::lock_guard l(mLock); + auto it = findStorageLocked(path); + if (it == mBindsByPath.end()) { + return kInvalidStorageId; + } + return it->second->second.storage; +} + +void IncrementalService::deleteStorage(StorageId storageId) { + const auto ifs = getIfs(storageId); + if (!ifs) { + return; + } + deleteStorage(*ifs); +} + +void IncrementalService::deleteStorage(IncrementalService::IncFsMount& ifs) { + std::unique_lock l(ifs.lock); + deleteStorageLocked(ifs, std::move(l)); +} + +void IncrementalService::deleteStorageLocked(IncrementalService::IncFsMount& ifs, + std::unique_lock<std::mutex>&& ifsLock) { + const auto storages = std::move(ifs.storages); + // Don't move the bind points out: Ifs's dtor will use them to unmount everything. + const auto bindPoints = ifs.bindPoints; + ifsLock.unlock(); + + std::lock_guard l(mLock); + for (auto&& [id, _] : storages) { + if (id != ifs.mountId) { + mMounts.erase(id); + } + } + for (auto&& [path, _] : bindPoints) { + mBindsByPath.erase(path); + } + mMounts.erase(ifs.mountId); +} + +StorageId IncrementalService::openStorage(std::string_view pathInMount) { + if (!path::isAbsolute(pathInMount)) { + return kInvalidStorageId; + } + + return findStorageId(path::normalize(pathInMount)); +} + +Inode IncrementalService::nodeFor(StorageId storage, std::string_view subpath) const { + const auto ifs = getIfs(storage); + if (!ifs) { + return -1; + } + std::unique_lock l(ifs->lock); + auto storageIt = ifs->storages.find(storage); + if (storageIt == ifs->storages.end()) { + return -1; + } + if (subpath.empty() || subpath == "."sv) { + return storageIt->second.node; + } + auto path = path::join(ifs->root, constants().mount, storageIt->second.name, subpath); + l.unlock(); + struct stat st; + if (::stat(path.c_str(), &st)) { + return -1; + } + return st.st_ino; +} + +std::pair<Inode, std::string_view> IncrementalService::parentAndNameFor( + StorageId storage, std::string_view subpath) const { + auto name = path::basename(subpath); + if (name.empty()) { + return {-1, {}}; + } + auto dir = path::dirname(subpath); + if (dir.empty() || dir == "/"sv) { + return {-1, {}}; + } + auto inode = nodeFor(storage, dir); + return {inode, name}; +} + +IncrementalService::IfsMountPtr IncrementalService::getIfs(StorageId storage) const { + std::lock_guard l(mLock); + return getIfsLocked(storage); +} + +const IncrementalService::IfsMountPtr& IncrementalService::getIfsLocked(StorageId storage) const { + auto it = mMounts.find(storage); + if (it == mMounts.end()) { + static const IfsMountPtr kEmpty = {}; + return kEmpty; + } + return it->second; +} + +int IncrementalService::bind(StorageId storage, std::string_view sourceSubdir, + std::string_view target, BindKind kind) { + if (!isValidMountTarget(target)) { + return -EINVAL; + } + + const auto ifs = getIfs(storage); + if (!ifs) { + return -EINVAL; + } + std::unique_lock l(ifs->lock); + const auto storageInfo = ifs->storages.find(storage); + if (storageInfo == ifs->storages.end()) { + return -EINVAL; + } + auto source = path::join(storageInfo->second.name, sourceSubdir); + l.unlock(); + std::unique_lock l2(mLock, std::defer_lock); + return addBindMount(*ifs, storage, std::move(source), path::normalize(target), kind, l2); +} + +int IncrementalService::unbind(StorageId storage, std::string_view target) { + if (!path::isAbsolute(target)) { + return -EINVAL; + } + + LOG(INFO) << "Removing bind point " << target; + + // Here we should only look up by the exact target, not by a subdirectory of any existing mount, + // otherwise there's a chance to unmount something completely unrelated + const auto norm = path::normalize(target); + std::unique_lock l(mLock); + const auto storageIt = mBindsByPath.find(norm); + if (storageIt == mBindsByPath.end() || storageIt->second->second.storage != storage) { + return -EINVAL; + } + const auto bindIt = storageIt->second; + const auto storageId = bindIt->second.storage; + const auto ifs = getIfsLocked(storageId); + if (!ifs) { + LOG(ERROR) << "Internal error: storageId " << storageId << " for bound path " << target + << " is missing"; + return -EFAULT; + } + mBindsByPath.erase(storageIt); + l.unlock(); + + mVold->unmountIncFs(bindIt->first); + std::unique_lock l2(ifs->lock); + if (ifs->bindPoints.size() <= 1) { + ifs->bindPoints.clear(); + deleteStorageLocked(*ifs, std::move(l2)); + } else { + const std::string savedFile = std::move(bindIt->second.savedFilename); + ifs->bindPoints.erase(bindIt); + l2.unlock(); + if (!savedFile.empty()) { + mIncFs->unlink(ifs->control, INCFS_ROOT_INODE, savedFile); + } + } + return 0; +} + +Inode IncrementalService::makeFile(StorageId storageId, std::string_view pathUnderStorage, + long size, std::string_view metadata, + std::string_view signature) { + (void)signature; + auto [parentInode, name] = parentAndNameFor(storageId, pathUnderStorage); + if (parentInode < 0) { + return -EINVAL; + } + if (auto ifs = getIfs(storageId)) { + auto inode = mIncFs->makeFile(ifs->control, name, parentInode, size, metadata); + if (inode < 0) { + return inode; + } + auto metadataBytes = std::vector<uint8_t>(); + if (metadata.data() != nullptr && metadata.size() > 0) { + metadataBytes.insert(metadataBytes.end(), &metadata.data()[0], + &metadata.data()[metadata.size()]); + } + mIncrementalManager->newFileForDataLoader(ifs->mountId, inode, metadataBytes); + return inode; + } + return -EINVAL; +} + +Inode IncrementalService::makeDir(StorageId storageId, std::string_view pathUnderStorage, + std::string_view metadata) { + auto [parentInode, name] = parentAndNameFor(storageId, pathUnderStorage); + if (parentInode < 0) { + return -EINVAL; + } + if (auto ifs = getIfs(storageId)) { + return mIncFs->makeDir(ifs->control, name, parentInode, metadata); + } + return -EINVAL; +} + +Inode IncrementalService::makeDirs(StorageId storageId, std::string_view pathUnderStorage, + std::string_view metadata) { + const auto ifs = getIfs(storageId); + if (!ifs) { + return -EINVAL; + } + std::string_view parentDir(pathUnderStorage); + auto p = parentAndNameFor(storageId, pathUnderStorage); + std::stack<std::string> pathsToCreate; + while (p.first < 0) { + parentDir = path::dirname(parentDir); + pathsToCreate.emplace(parentDir); + p = parentAndNameFor(storageId, parentDir); + } + Inode inode; + while (!pathsToCreate.empty()) { + p = parentAndNameFor(storageId, pathsToCreate.top()); + pathsToCreate.pop(); + inode = mIncFs->makeDir(ifs->control, p.second, p.first, metadata); + if (inode < 0) { + return inode; + } + } + return mIncFs->makeDir(ifs->control, path::basename(pathUnderStorage), inode, metadata); +} + +int IncrementalService::link(StorageId storage, Inode item, Inode newParent, + std::string_view newName) { + if (auto ifs = getIfs(storage)) { + return mIncFs->link(ifs->control, item, newParent, newName); + } + return -EINVAL; +} + +int IncrementalService::unlink(StorageId storage, Inode parent, std::string_view name) { + if (auto ifs = getIfs(storage)) { + return mIncFs->unlink(ifs->control, parent, name); + } + return -EINVAL; +} + +int IncrementalService::addBindMount(IncFsMount& ifs, StorageId storage, std::string&& sourceSubdir, + std::string&& target, BindKind kind, + std::unique_lock<std::mutex>& mainLock) { + if (!isValidMountTarget(target)) { + return -EINVAL; + } + + std::string mdFileName; + if (kind != BindKind::Temporary) { + metadata::BindPoint bp; + bp.set_storage_id(storage); + bp.set_allocated_dest_path(&target); + bp.set_allocated_source_subdir(&sourceSubdir); + const auto metadata = bp.SerializeAsString(); + bp.release_source_subdir(); + bp.release_dest_path(); + mdFileName = makeBindMdName(); + auto node = mIncFs->makeFile(ifs.control, mdFileName, INCFS_ROOT_INODE, 0, metadata); + if (node < 0) { + return int(node); + } + } + + return addBindMountWithMd(ifs, storage, std::move(mdFileName), std::move(sourceSubdir), + std::move(target), kind, mainLock); +} + +int IncrementalService::addBindMountWithMd(IncrementalService::IncFsMount& ifs, StorageId storage, + std::string&& metadataName, std::string&& sourceSubdir, + std::string&& target, BindKind kind, + std::unique_lock<std::mutex>& mainLock) { + LOG(INFO) << "Adding bind mount: " << sourceSubdir << " -> " << target; + { + auto path = path::join(ifs.root, constants().mount, sourceSubdir); + std::lock_guard l(mMountOperationLock); + const auto status = mVold->bindMount(path, target); + if (!status.isOk()) { + LOG(ERROR) << "Calling Vold::bindMount() failed: " << status.toString8(); + return status.exceptionCode() == binder::Status::EX_SERVICE_SPECIFIC + ? status.serviceSpecificErrorCode() > 0 ? -status.serviceSpecificErrorCode() + : status.serviceSpecificErrorCode() == 0 + ? -EFAULT + : status.serviceSpecificErrorCode() + : -EIO; + } + } + + if (!mainLock.owns_lock()) { + mainLock.lock(); + } + std::lock_guard l(ifs.lock); + const auto [it, _] = + ifs.bindPoints.insert_or_assign(target, + IncFsMount::Bind{storage, std::move(metadataName), + std::move(sourceSubdir), kind}); + mBindsByPath[std::move(target)] = it; + return 0; +} + +RawMetadata IncrementalService::getMetadata(StorageId storage, Inode node) const { + const auto ifs = getIfs(storage); + if (!ifs) { + return {}; + } + return mIncFs->getMetadata(ifs->control, node); +} + +std::vector<std::string> IncrementalService::listFiles(StorageId storage) const { + const auto ifs = getIfs(storage); + if (!ifs) { + return {}; + } + + std::unique_lock l(ifs->lock); + auto subdirIt = ifs->storages.find(storage); + if (subdirIt == ifs->storages.end()) { + return {}; + } + auto dir = path::join(ifs->root, constants().mount, subdirIt->second.name); + l.unlock(); + + const auto prefixSize = dir.size() + 1; + std::vector<std::string> todoDirs{std::move(dir)}; + std::vector<std::string> result; + do { + auto currDir = std::move(todoDirs.back()); + todoDirs.pop_back(); + + auto d = + std::unique_ptr<DIR, decltype(&::closedir)>(::opendir(currDir.c_str()), ::closedir); + while (auto e = ::readdir(d.get())) { + if (e->d_type == DT_REG) { + result.emplace_back( + path::join(std::string_view(currDir).substr(prefixSize), e->d_name)); + continue; + } + if (e->d_type == DT_DIR) { + if (e->d_name == "."sv || e->d_name == ".."sv) { + continue; + } + todoDirs.emplace_back(path::join(currDir, e->d_name)); + continue; + } + } + } while (!todoDirs.empty()); + return result; +} + +bool IncrementalService::startLoading(StorageId storage) const { + const auto ifs = getIfs(storage); + if (!ifs) { + return false; + } + bool started = false; + std::unique_lock l(ifs->lock); + if (ifs->dataLoaderStatus != IDataLoaderStatusListener::DATA_LOADER_READY) { + if (ifs->dataLoaderReady.wait_for(l, Seconds(5)) == std::cv_status::timeout) { + LOG(ERROR) << "Timeout waiting for data loader to be ready"; + return false; + } + } + auto status = mIncrementalManager->startDataLoader(ifs->mountId, &started); + if (!status.isOk()) { + return false; + } + return started; +} + +void IncrementalService::mountExistingImages() { + auto d = std::unique_ptr<DIR, decltype(&::closedir)>(::opendir(mIncrementalDir.c_str()), + ::closedir); + while (auto e = ::readdir(d.get())) { + if (e->d_type != DT_DIR) { + continue; + } + if (e->d_name == "."sv || e->d_name == ".."sv) { + continue; + } + auto root = path::join(mIncrementalDir, e->d_name); + if (!mountExistingImage(root, e->d_name)) { + IncFsMount::cleanupFilesystem(root); + } + } +} + +bool IncrementalService::mountExistingImage(std::string_view root, std::string_view key) { + LOG(INFO) << "Trying to mount: " << key; + + auto mountTarget = path::join(root, constants().mount); + const auto image = path::join(root, constants().backing, constants().image); + + IncFsMount::Control control; + IncrementalFileSystemControlParcel controlParcel; + auto status = mVold->mountIncFs(image, mountTarget, 0, &controlParcel); + if (!status.isOk()) { + LOG(ERROR) << "Vold::mountIncFs() failed: " << status.toString8(); + return false; + } + if (controlParcel.cmd) { + control.cmdFd = controlParcel.cmd->release(); + } + if (controlParcel.log) { + control.logFd = controlParcel.log->release(); + } + + auto ifs = std::make_shared<IncFsMount>(std::string(root), -1, std::move(control), *this); + + auto m = parseFromIncfs<metadata::Mount>(mIncFs.get(), ifs->control, + path::join(mountTarget, constants().infoMdName)); + if (!m.has_loader() || !m.has_storage()) { + LOG(ERROR) << "Bad mount metadata in mount at " << root; + return false; + } + + ifs->mountId = m.storage().id(); + mNextId = std::max(mNextId, ifs->mountId + 1); + + std::vector<std::pair<std::string, metadata::BindPoint>> bindPoints; + auto d = std::unique_ptr<DIR, decltype(&::closedir)>(::opendir(path::c_str(mountTarget)), + ::closedir); + while (auto e = ::readdir(d.get())) { + if (e->d_type == DT_REG) { + auto name = std::string_view(e->d_name); + if (name.starts_with(constants().mountpointMdPrefix)) { + bindPoints.emplace_back(name, + parseFromIncfs<metadata::BindPoint>(mIncFs.get(), + ifs->control, + path::join(mountTarget, + name))); + if (bindPoints.back().second.dest_path().empty() || + bindPoints.back().second.source_subdir().empty()) { + bindPoints.pop_back(); + mIncFs->unlink(ifs->control, INCFS_ROOT_INODE, name); + } + } + } else if (e->d_type == DT_DIR) { + if (e->d_name == "."sv || e->d_name == ".."sv) { + continue; + } + auto name = std::string_view(e->d_name); + if (name.starts_with(constants().storagePrefix)) { + auto md = parseFromIncfs<metadata::Storage>(mIncFs.get(), ifs->control, + path::join(mountTarget, name)); + auto [_, inserted] = mMounts.try_emplace(md.id(), ifs); + if (!inserted) { + LOG(WARNING) << "Ignoring storage with duplicate id " << md.id() + << " for mount " << root; + continue; + } + ifs->storages.insert_or_assign(md.id(), + IncFsMount::Storage{std::string(name), + Inode(e->d_ino)}); + mNextId = std::max(mNextId, md.id() + 1); + } + } + } + + if (ifs->storages.empty()) { + LOG(WARNING) << "No valid storages in mount " << root; + return false; + } + + int bindCount = 0; + for (auto&& bp : bindPoints) { + std::unique_lock l(mLock, std::defer_lock); + bindCount += !addBindMountWithMd(*ifs, bp.second.storage_id(), std::move(bp.first), + std::move(*bp.second.mutable_source_subdir()), + std::move(*bp.second.mutable_dest_path()), + BindKind::Permanent, l); + } + + if (bindCount == 0) { + LOG(WARNING) << "No valid bind points for mount " << root; + deleteStorage(*ifs); + return false; + } + + DataLoaderParamsParcel dlParams; + dlParams.packageName = std::move(*m.mutable_loader()->mutable_package_name()); + dlParams.staticArgs = std::move(*m.mutable_loader()->mutable_arguments()); + if (!prepareDataLoader(*ifs, &dlParams)) { + deleteStorage(*ifs); + return false; + } + + mMounts[ifs->mountId] = std::move(ifs); + return true; +} + +bool IncrementalService::prepareDataLoader(IncrementalService::IncFsMount& ifs, + DataLoaderParamsParcel* params) { + if (!mSystemReady.load(std::memory_order_relaxed)) { + std::unique_lock l(ifs.lock); + if (params) { + if (ifs.savedDataLoaderParams) { + LOG(WARNING) << "Trying to pass second set of data loader parameters, ignored it"; + } else { + ifs.savedDataLoaderParams = std::move(*params); + } + } else { + if (!ifs.savedDataLoaderParams) { + LOG(ERROR) << "Mount " << ifs.mountId + << " is broken: no data loader params (system is not ready yet)"; + return false; + } + } + return true; // eventually... + } + if (base::GetBoolProperty("incremental.skip_loader", false)) { + LOG(INFO) << "Skipped data loader because of incremental.skip_loader property"; + std::unique_lock l(ifs.lock); + ifs.savedDataLoaderParams.reset(); + return true; + } + + std::unique_lock l(ifs.lock); + if (ifs.dataLoaderStatus == IDataLoaderStatusListener::DATA_LOADER_READY) { + LOG(INFO) << "Skipped data loader preparation because it already exists"; + return true; + } + + auto* dlp = params ? params + : ifs.savedDataLoaderParams ? &ifs.savedDataLoaderParams.value() : nullptr; + if (!dlp) { + LOG(ERROR) << "Mount " << ifs.mountId << " is broken: no data loader params"; + return false; + } + FileSystemControlParcel fsControlParcel; + fsControlParcel.incremental = std::make_unique<IncrementalFileSystemControlParcel>(); + fsControlParcel.incremental->cmd = + std::make_unique<os::ParcelFileDescriptor>(base::unique_fd(::dup(ifs.control.cmdFd))); + fsControlParcel.incremental->log = + std::make_unique<os::ParcelFileDescriptor>(base::unique_fd(::dup(ifs.control.logFd))); + sp<IncrementalDataLoaderListener> listener = new IncrementalDataLoaderListener(*this); + bool created = false; + auto status = mIncrementalManager->prepareDataLoader(ifs.mountId, fsControlParcel, *dlp, + listener, &created); + if (!status.isOk() || !created) { + LOG(ERROR) << "Failed to create a data loader for mount " << ifs.mountId; + return false; + } + ifs.savedDataLoaderParams.reset(); + return true; +} + +binder::Status IncrementalService::IncrementalDataLoaderListener::onStatusChanged(MountId mountId, + int newStatus) { + std::unique_lock l(incrementalService.mLock); + const auto& ifs = incrementalService.getIfsLocked(mountId); + if (!ifs) { + LOG(WARNING) << "Received data loader status " << int(newStatus) << " for unknown mount " + << mountId; + return binder::Status::ok(); + } + ifs->dataLoaderStatus = newStatus; + switch (newStatus) { + case IDataLoaderStatusListener::DATA_LOADER_NO_CONNECTION: { + auto now = Clock::now(); + if (ifs->connectionLostTime.time_since_epoch().count() == 0) { + ifs->connectionLostTime = now; + break; + } + auto duration = + std::chrono::duration_cast<Seconds>(now - ifs->connectionLostTime).count(); + if (duration >= 10) { + incrementalService.mIncrementalManager->showHealthBlockedUI(mountId); + } + break; + } + case IDataLoaderStatusListener::DATA_LOADER_READY: { + ifs->dataLoaderReady.notify_one(); + break; + } + case IDataLoaderStatusListener::DATA_LOADER_NOT_READY: { + ifs->dataLoaderStatus = IDataLoaderStatusListener::DATA_LOADER_STOPPED; + incrementalService.deleteStorageLocked(*ifs, std::move(l)); + break; + } + case IDataLoaderStatusListener::DATA_LOADER_RUNNING: { + break; + } + case IDataLoaderStatusListener::DATA_LOADER_CONNECTION_OK: { + ifs->dataLoaderStatus = IDataLoaderStatusListener::DATA_LOADER_RUNNING; + break; + } + case IDataLoaderStatusListener::DATA_LOADER_STOPPED: { + break; + } + default: { + LOG(WARNING) << "Unknown data loader status: " << newStatus + << " for mount: " << mountId; + break; + } + } + + return binder::Status::ok(); +} + +} // namespace android::incremental |