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Diffstat (limited to '')
| -rw-r--r-- | updater/dynamic_partitions.cpp | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/updater/dynamic_partitions.cpp b/updater/dynamic_partitions.cpp new file mode 100644 index 000000000..b50dd75f9 --- /dev/null +++ b/updater/dynamic_partitions.cpp @@ -0,0 +1,435 @@ +/* + * 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. + */ + +#include "updater/dynamic_partitions.h" + +#include <sys/stat.h> +#include <sys/types.h> + +#include <algorithm> +#include <chrono> +#include <iterator> +#include <memory> +#include <optional> +#include <string> +#include <type_traits> +#include <vector> + +#include <android-base/file.h> +#include <android-base/logging.h> +#include <android-base/parseint.h> +#include <android-base/strings.h> +#include <fs_mgr.h> +#include <fs_mgr_dm_linear.h> +#include <libdm/dm.h> +#include <liblp/builder.h> + +#include "edify/expr.h" +#include "otautil/error_code.h" +#include "otautil/paths.h" +#include "private/utils.h" + +using android::base::ParseUint; +using android::dm::DeviceMapper; +using android::dm::DmDeviceState; +using android::fs_mgr::CreateLogicalPartition; +using android::fs_mgr::DestroyLogicalPartition; +using android::fs_mgr::LpMetadata; +using android::fs_mgr::MetadataBuilder; +using android::fs_mgr::Partition; +using android::fs_mgr::PartitionOpener; + +static constexpr std::chrono::milliseconds kMapTimeout{ 1000 }; +static constexpr char kMetadataUpdatedMarker[] = "/dynamic_partition_metadata.UPDATED"; + +static std::string GetSuperDevice() { + return "/dev/block/by-name/" + fs_mgr_get_super_partition_name(); +} + +static std::vector<std::string> ReadStringArgs(const char* name, State* state, + const std::vector<std::unique_ptr<Expr>>& argv, + const std::vector<std::string>& arg_names) { + if (argv.size() != arg_names.size()) { + ErrorAbort(state, kArgsParsingFailure, "%s expects %zu arguments, got %zu", name, + arg_names.size(), argv.size()); + return {}; + } + + std::vector<std::unique_ptr<Value>> args; + if (!ReadValueArgs(state, argv, &args)) { + return {}; + } + + CHECK_EQ(args.size(), arg_names.size()); + + for (size_t i = 0; i < arg_names.size(); ++i) { + if (args[i]->type != Value::Type::STRING) { + ErrorAbort(state, kArgsParsingFailure, "%s argument to %s must be string", + arg_names[i].c_str(), name); + return {}; + } + } + + std::vector<std::string> ret; + std::transform(args.begin(), args.end(), std::back_inserter(ret), + [](const auto& arg) { return arg->data; }); + return ret; +} + +static bool UnmapPartitionOnDeviceMapper(const std::string& partition_name) { + auto state = DeviceMapper::Instance().GetState(partition_name); + if (state == DmDeviceState::INVALID) { + return true; + } + if (state == DmDeviceState::ACTIVE) { + return DestroyLogicalPartition(partition_name, kMapTimeout); + } + LOG(ERROR) << "Unknown device mapper state: " + << static_cast<std::underlying_type_t<DmDeviceState>>(state); + return false; +} + +static bool MapPartitionOnDeviceMapper(const std::string& partition_name, std::string* path) { + auto state = DeviceMapper::Instance().GetState(partition_name); + if (state == DmDeviceState::INVALID) { + return CreateLogicalPartition(GetSuperDevice(), 0 /* metadata slot */, partition_name, + true /* force writable */, kMapTimeout, path); + } + + if (state == DmDeviceState::ACTIVE) { + return DeviceMapper::Instance().GetDmDevicePathByName(partition_name, path); + } + LOG(ERROR) << "Unknown device mapper state: " + << static_cast<std::underlying_type_t<DmDeviceState>>(state); + return false; +} + +Value* UnmapPartitionFn(const char* name, State* state, + const std::vector<std::unique_ptr<Expr>>& argv) { + auto args = ReadStringArgs(name, state, argv, { "name" }); + if (args.empty()) return StringValue(""); + + return UnmapPartitionOnDeviceMapper(args[0]) ? StringValue("t") : StringValue(""); +} + +Value* MapPartitionFn(const char* name, State* state, + const std::vector<std::unique_ptr<Expr>>& argv) { + auto args = ReadStringArgs(name, state, argv, { "name" }); + if (args.empty()) return StringValue(""); + + std::string path; + bool result = MapPartitionOnDeviceMapper(args[0], &path); + return result ? StringValue(path) : StringValue(""); +} + +namespace { // Ops + +struct OpParameters { + std::vector<std::string> tokens; + MetadataBuilder* builder; + + bool ExpectArgSize(size_t size) const { + CHECK(!tokens.empty()); + auto actual = tokens.size() - 1; + if (actual != size) { + LOG(ERROR) << "Op " << op() << " expects " << size << " args, got " << actual; + return false; + } + return true; + } + const std::string& op() const { + CHECK(!tokens.empty()); + return tokens[0]; + } + const std::string& arg(size_t pos) const { + CHECK_LE(pos + 1, tokens.size()); + return tokens[pos + 1]; + } + std::optional<uint64_t> uint_arg(size_t pos, const std::string& name) const { + auto str = arg(pos); + uint64_t ret; + if (!ParseUint(str, &ret)) { + LOG(ERROR) << "Op " << op() << " expects uint64 for argument " << name << ", got " << str; + return std::nullopt; + } + return ret; + } +}; + +using OpFunction = std::function<bool(const OpParameters&)>; +using OpMap = std::map<std::string, OpFunction>; + +bool PerformOpResize(const OpParameters& params) { + if (!params.ExpectArgSize(2)) return false; + const auto& partition_name = params.arg(0); + auto size = params.uint_arg(1, "size"); + if (!size.has_value()) return false; + + auto partition = params.builder->FindPartition(partition_name); + if (partition == nullptr) { + LOG(ERROR) << "Failed to find partition " << partition_name + << " in dynamic partition metadata."; + return false; + } + if (!UnmapPartitionOnDeviceMapper(partition_name)) { + LOG(ERROR) << "Cannot unmap " << partition_name << " before resizing."; + return false; + } + if (!params.builder->ResizePartition(partition, size.value())) { + LOG(ERROR) << "Failed to resize partition " << partition_name << " to size " << *size << "."; + return false; + } + return true; +} + +bool PerformOpRemove(const OpParameters& params) { + if (!params.ExpectArgSize(1)) return false; + const auto& partition_name = params.arg(0); + + if (!UnmapPartitionOnDeviceMapper(partition_name)) { + LOG(ERROR) << "Cannot unmap " << partition_name << " before removing."; + return false; + } + params.builder->RemovePartition(partition_name); + return true; +} + +bool PerformOpAdd(const OpParameters& params) { + if (!params.ExpectArgSize(2)) return false; + const auto& partition_name = params.arg(0); + const auto& group_name = params.arg(1); + + if (params.builder->AddPartition(partition_name, group_name, LP_PARTITION_ATTR_READONLY) == + nullptr) { + LOG(ERROR) << "Failed to add partition " << partition_name << " to group " << group_name << "."; + return false; + } + return true; +} + +bool PerformOpMove(const OpParameters& params) { + if (!params.ExpectArgSize(2)) return false; + const auto& partition_name = params.arg(0); + const auto& new_group = params.arg(1); + + auto partition = params.builder->FindPartition(partition_name); + if (partition == nullptr) { + LOG(ERROR) << "Cannot move partition " << partition_name << " to group " << new_group + << " because it is not found."; + return false; + } + + auto old_group = partition->group_name(); + if (old_group != new_group) { + if (!params.builder->ChangePartitionGroup(partition, new_group)) { + LOG(ERROR) << "Cannot move partition " << partition_name << " from group " << old_group + << " to group " << new_group << "."; + return false; + } + } + return true; +} + +bool PerformOpAddGroup(const OpParameters& params) { + if (!params.ExpectArgSize(2)) return false; + const auto& group_name = params.arg(0); + auto maximum_size = params.uint_arg(1, "maximum_size"); + if (!maximum_size.has_value()) return false; + + auto group = params.builder->FindGroup(group_name); + if (group != nullptr) { + LOG(ERROR) << "Cannot add group " << group_name << " because it already exists."; + return false; + } + + if (maximum_size.value() == 0) { + LOG(WARNING) << "Adding group " << group_name << " with no size limits."; + } + + if (!params.builder->AddGroup(group_name, maximum_size.value())) { + LOG(ERROR) << "Failed to add group " << group_name << " with maximum size " + << maximum_size.value() << "."; + return false; + } + return true; +} + +bool PerformOpResizeGroup(const OpParameters& params) { + if (!params.ExpectArgSize(2)) return false; + const auto& group_name = params.arg(0); + auto new_size = params.uint_arg(1, "maximum_size"); + if (!new_size.has_value()) return false; + + auto group = params.builder->FindGroup(group_name); + if (group == nullptr) { + LOG(ERROR) << "Cannot resize group " << group_name << " because it is not found."; + return false; + } + + auto old_size = group->maximum_size(); + if (old_size != new_size.value()) { + if (!params.builder->ChangeGroupSize(group_name, new_size.value())) { + LOG(ERROR) << "Cannot resize group " << group_name << " from " << old_size << " to " + << new_size.value() << "."; + return false; + } + } + return true; +} + +std::vector<std::string> ListPartitionNamesInGroup(MetadataBuilder* builder, + const std::string& group_name) { + auto partitions = builder->ListPartitionsInGroup(group_name); + std::vector<std::string> partition_names; + std::transform(partitions.begin(), partitions.end(), std::back_inserter(partition_names), + [](Partition* partition) { return partition->name(); }); + return partition_names; +} + +bool PerformOpRemoveGroup(const OpParameters& params) { + if (!params.ExpectArgSize(1)) return false; + const auto& group_name = params.arg(0); + + auto partition_names = ListPartitionNamesInGroup(params.builder, group_name); + if (!partition_names.empty()) { + LOG(ERROR) << "Cannot remove group " << group_name << " because it still contains partitions [" + << android::base::Join(partition_names, ", ") << "]"; + return false; + } + params.builder->RemoveGroupAndPartitions(group_name); + return true; +} + +bool PerformOpRemoveAllGroups(const OpParameters& params) { + if (!params.ExpectArgSize(0)) return false; + + auto group_names = params.builder->ListGroups(); + for (const auto& group_name : group_names) { + auto partition_names = ListPartitionNamesInGroup(params.builder, group_name); + for (const auto& partition_name : partition_names) { + if (!UnmapPartitionOnDeviceMapper(partition_name)) { + LOG(ERROR) << "Cannot unmap " << partition_name << " before removing group " << group_name + << "."; + return false; + } + } + params.builder->RemoveGroupAndPartitions(group_name); + } + return true; +} + +} // namespace + +Value* UpdateDynamicPartitionsFn(const char* name, State* state, + const std::vector<std::unique_ptr<Expr>>& argv) { + if (argv.size() != 1) { + ErrorAbort(state, kArgsParsingFailure, "%s expects 1 arguments, got %zu", name, argv.size()); + return StringValue(""); + } + std::vector<std::unique_ptr<Value>> args; + if (!ReadValueArgs(state, argv, &args)) { + return nullptr; + } + const std::unique_ptr<Value>& op_list_value = args[0]; + if (op_list_value->type != Value::Type::BLOB) { + ErrorAbort(state, kArgsParsingFailure, "op_list argument to %s must be blob", name); + return StringValue(""); + } + + std::string updated_marker = Paths::Get().stash_directory_base() + kMetadataUpdatedMarker; + if (state->is_retry) { + struct stat sb; + int result = stat(updated_marker.c_str(), &sb); + if (result == 0) { + LOG(INFO) << "Skipping already updated dynamic partition metadata based on marker"; + return StringValue("t"); + } + } else { + // Delete the obsolete marker if any. + std::string err; + if (!android::base::RemoveFileIfExists(updated_marker, &err)) { + LOG(ERROR) << "Failed to remove dynamic partition metadata updated marker " << updated_marker + << ": " << err; + return StringValue(""); + } + } + + auto super_device = GetSuperDevice(); + auto builder = MetadataBuilder::New(PartitionOpener(), super_device, 0); + if (builder == nullptr) { + LOG(ERROR) << "Failed to load dynamic partition metadata."; + return StringValue(""); + } + + static const OpMap op_map{ + // clang-format off + {"resize", PerformOpResize}, + {"remove", PerformOpRemove}, + {"add", PerformOpAdd}, + {"move", PerformOpMove}, + {"add_group", PerformOpAddGroup}, + {"resize_group", PerformOpResizeGroup}, + {"remove_group", PerformOpRemoveGroup}, + {"remove_all_groups", PerformOpRemoveAllGroups}, + // clang-format on + }; + + std::vector<std::string> lines = android::base::Split(op_list_value->data, "\n"); + for (const auto& line : lines) { + auto comment_idx = line.find('#'); + auto op_and_args = comment_idx == std::string::npos ? line : line.substr(0, comment_idx); + op_and_args = android::base::Trim(op_and_args); + if (op_and_args.empty()) continue; + + auto tokens = android::base::Split(op_and_args, " "); + const auto& op = tokens[0]; + auto it = op_map.find(op); + if (it == op_map.end()) { + LOG(ERROR) << "Unknown operation in op_list: " << op; + return StringValue(""); + } + OpParameters params; + params.tokens = tokens; + params.builder = builder.get(); + if (!it->second(params)) { + return StringValue(""); + } + } + + auto metadata = builder->Export(); + if (metadata == nullptr) { + LOG(ERROR) << "Failed to export metadata."; + return StringValue(""); + } + + if (!UpdatePartitionTable(super_device, *metadata, 0)) { + LOG(ERROR) << "Failed to write metadata."; + return StringValue(""); + } + + if (!SetUpdatedMarker(updated_marker)) { + LOG(ERROR) << "Failed to set metadata updated marker."; + return StringValue(""); + } + + return StringValue("t"); +} + +void RegisterDynamicPartitionsFunctions() { + RegisterFunction("unmap_partition", UnmapPartitionFn); + RegisterFunction("map_partition", MapPartitionFn); + RegisterFunction("update_dynamic_partitions", UpdateDynamicPartitionsFn); +} |