121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
/*
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* Copyright (C) 2019 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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#include <array>
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#include <cstdio>
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#include <fstream>
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#include <string>
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#include <android-base/parseint.h>
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#include <android-base/properties.h>
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#include <android/api-level.h>
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#include <gmock/gmock.h>
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#include <gtest/gtest.h>
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#include <vintf/VintfObject.h>
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using android::vintf::KernelVersion;
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using android::vintf::VintfObject;
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using android::base::ParseInt;
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namespace android {
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namespace kernel {
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class KernelLoopConfigTest : public ::testing::Test {
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protected:
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const int first_api_level_;
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KernelLoopConfigTest()
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: first_api_level_(std::stoi(
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android::base::GetProperty("ro.product.first_api_level", "0"))) {}
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bool should_run() const {
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// TODO check for APEX support (for upgrading devices)
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return first_api_level_ >= __ANDROID_API_Q__;
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}
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};
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TEST_F(KernelLoopConfigTest, ValidLoopCountConfig) {
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if (!should_run()) return;
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static constexpr const char* kCmd =
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"zcat /proc/config.gz | grep CONFIG_BLK_DEV_LOOP_MIN_COUNT";
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std::array<char, 256> line;
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std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(kCmd, "r"), pclose);
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ASSERT_NE(pipe, nullptr);
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auto read = fgets(line.data(), line.size(), pipe.get());
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ASSERT_NE(read, nullptr);
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auto minCountStr = std::string(read);
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auto pos = minCountStr.find("=");
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ASSERT_NE(pos, std::string::npos);
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ASSERT_GE(minCountStr.length(), pos + 1);
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int minCountValue = std::stoi(minCountStr.substr(pos + 1));
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ASSERT_GE(minCountValue, 16);
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std::ifstream max_loop("/sys/module/loop/parameters/max_loop");
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std::string max_loop_str;
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std::getline(max_loop, max_loop_str);
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int max_loop_value;
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ParseInt(max_loop_str, &max_loop_value);
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auto runtime_info = VintfObject::GetRuntimeInfo();
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ASSERT_NE(nullptr, runtime_info);
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/*
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* Upstream commit 85c50197716c ("loop: Fix the max_loop commandline argument
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* treatment when it is set to 0") aligned max_loop to the kernel
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* documentation, which states that when it is not set, it should be
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* CONFIG_BLK_DEV_LOOP_MIN_COUNT instead of 0. This commit was applied to
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* kernels 5.15.86+.
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*
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* For kernels older than 5.15.86, ensure that max_loop is not set by ensuring
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* that it is 0. This ensures that CONFIG_BLK_DEV_LOOP_MIN_COUNT are being
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* pre-allocated.
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*
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* For kernels 5.15.86+ ensure that max_loop is either not set (i.e. it is
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* CONFIG_BLK_DEV_LOOP_MIN_COUNT), or if it is set, it s greater than
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* CONFIG_BLK_DEV_LOOP_MIN_COUNT to ensure that at least that many loop
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* devices are pre-allocated.
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*/
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if (runtime_info->kernelVersion() < KernelVersion(5, 15, 86)) {
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EXPECT_EQ(0, max_loop_value);
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} else {
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EXPECT_GE(max_loop_value, minCountValue);
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}
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}
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TEST_F(KernelLoopConfigTest, ValidLoopPartParameter) {
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if (!should_run()) return;
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std::ifstream max_part("/sys/module/loop/parameters/max_part");
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std::string max_part_str;
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std::getline(max_part, max_part_str);
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int max_part_value = std::stoi(max_part_str);
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EXPECT_LE(max_part_value, 7);
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}
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} // namespace kernel
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} // namespace android
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