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-rw-r--r--updater/dynamic_partitions.cpp435
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diff --git a/updater/dynamic_partitions.cpp b/updater/dynamic_partitions.cpp
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+/*
+ * 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);
+}