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// Copyright 2021 The gVisor Authors.
//
// 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 <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <algorithm>
#include <vector>
#include "gtest/gtest.h"
#include "absl/strings/str_cat.h"
#include "benchmark/benchmark.h"
#include "test/util/fs_util.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
#include "test/util/verity_util.h"
namespace gvisor {
namespace testing {
namespace {
// Creates a file in a nested directory hierarchy at least `depth` directories
// deep, and stats that file multiple times.
void BM_VerityStat(benchmark::State& state) {
// Create nested directories with given depth.
int depth = state.range(0);
// Mount a tmpfs file system to be wrapped by a verity fs.
TempPath top_dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
TEST_CHECK(mount("", top_dir.path().c_str(), "tmpfs", 0, "") == 0);
std::string dir_path = top_dir.path();
std::string child_path = "";
std::vector<EnableTarget> targets;
while (depth-- > 0) {
// Don't use TempPath because it will make paths too long to use.
//
// The top_dir destructor will clean up this whole tree.
dir_path = JoinPath(dir_path, absl::StrCat(depth));
ASSERT_NO_ERRNO(Mkdir(dir_path, 0755));
child_path = JoinPath(child_path, Basename(dir_path));
targets.emplace_back(EnableTarget(child_path, O_RDONLY));
}
// Create the file that will be stat'd.
const TempPath file =
ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir_path));
targets.emplace_back(
EnableTarget(JoinPath(child_path, Basename(file.path())), O_RDONLY));
// Reverse the targets because verity should be enabled from the lowest level.
std::reverse(targets.begin(), targets.end());
std::string verity_dir =
TEST_CHECK_NO_ERRNO_AND_VALUE(MountVerity(top_dir.path(), targets));
struct stat st;
for (auto _ : state) {
ASSERT_THAT(stat(JoinPath(verity_dir, targets[0].path).c_str(), &st),
SyscallSucceeds());
}
}
BENCHMARK(BM_VerityStat)->Range(1, 100)->UseRealTime();
} // namespace
} // namespace testing
} // namespace gvisor
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