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// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <time.h>
#include <iostream>
#include <vector>
#include "src/storage/host_fs_test/fixture.h"
namespace fs_test {
namespace {
struct TestParam {
size_t write_offset;
size_t read_offset;
size_t write_size;
};
class SparseHostFilesystemTest : public HostFilesystemTest,
public testing::WithParamInterface<TestParam> {};
static unsigned count = 0;
TEST_P(SparseHostFilesystemTest, Sparse) {
char filename[20];
sprintf(filename, "::my_file_%u", ++count);
int fd = emu_open(filename, O_RDWR | O_CREAT, 0644);
ASSERT_GT(fd, 0);
// Create a random write buffer of data
std::vector<uint8_t> wbuf(GetParam().write_size);
unsigned int seed = static_cast<unsigned int>(time(nullptr));
std::cerr << "Sparse test using seed: " << seed << std::endl;
for (size_t i = 0; i < GetParam().write_size; ++i) {
wbuf[i] = (uint8_t)rand_r(&seed);
}
// Dump write buffer to file
ASSERT_EQ(emu_pwrite(fd, &wbuf[0], GetParam().write_size, GetParam().write_offset),
static_cast<ssize_t>(GetParam().write_size));
// Reopen file
ASSERT_EQ(emu_close(fd), 0);
fd = emu_open(filename, O_RDWR, 0644);
ASSERT_GT(fd, 0);
// Access read buffer from file
const size_t file_size = GetParam().write_offset + GetParam().write_size;
const size_t bytes_to_read = (file_size - GetParam().read_offset) > GetParam().write_size
? GetParam().write_size
: (file_size - GetParam().read_offset);
ASSERT_GT(bytes_to_read, 0u) << "We want to test writing AND reading";
std::vector<uint8_t> rbuf(bytes_to_read);
ASSERT_EQ(emu_pread(fd, &rbuf[0], bytes_to_read, GetParam().read_offset),
static_cast<ssize_t>(bytes_to_read));
const size_t sparse_length = (GetParam().read_offset < GetParam().write_offset)
? GetParam().write_offset - GetParam().read_offset
: 0;
if (sparse_length > 0) {
for (size_t i = 0; i < sparse_length; ++i) {
ASSERT_EQ(rbuf[i], 0) << "This portion of file should be sparse; but isn't";
}
}
const size_t wbuf_offset = (GetParam().read_offset < GetParam().write_offset)
? 0
: GetParam().read_offset - GetParam().write_offset;
const size_t valid_length = bytes_to_read - sparse_length;
if (valid_length > 0) {
for (size_t i = 0; i < valid_length; ++i) {
ASSERT_EQ(rbuf[sparse_length + i], wbuf[wbuf_offset + i]);
}
}
ASSERT_EQ(emu_close(fd), 0);
ASSERT_EQ(RunFsck(), 0);
}
constexpr size_t kBlockSize = 8192;
constexpr size_t kDirectBlocks = 16;
std::string GetParamDescription(const testing::TestParamInfo<TestParam>& param) {
std::stringstream s;
s << "WriteOffset" << param.param.write_offset << "ReadOffset" << param.param.read_offset
<< "WriteSize" << param.param.write_size;
return s.str();
}
INSTANTIATE_TEST_SUITE_P(
/*no prefix*/, SparseHostFilesystemTest,
testing::Values(TestParam{kBlockSize / 2, 0, kBlockSize},
TestParam{kBlockSize / 2, kBlockSize, kBlockSize},
TestParam{kBlockSize, 0, kBlockSize},
TestParam{kBlockSize, kBlockSize / 2, kBlockSize},
TestParam{kBlockSize * kDirectBlocks, kBlockSize* kDirectBlocks - kBlockSize,
kBlockSize * 2},
TestParam{kBlockSize * kDirectBlocks, kBlockSize* kDirectBlocks - kBlockSize,
kBlockSize * 32},
TestParam{kBlockSize * kDirectBlocks + kBlockSize,
kBlockSize* kDirectBlocks - kBlockSize, kBlockSize * 32},
TestParam{kBlockSize * kDirectBlocks + kBlockSize,
kBlockSize* kDirectBlocks + 2 * kBlockSize, kBlockSize * 32}),
GetParamDescription);
} // namespace
} // namespace fs_test