選択できるのは25トピックまでです。
トピックは、先頭が英数字で、英数字とダッシュ('-')を使用した35文字以内のものにしてください。
742 行
22 KiB
742 行
22 KiB
// Copyright (c) 2018 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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// Prevent Windows headers from defining min/max macros and instead
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// use STL.
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#define NOMINMAX
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#include <windows.h>
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#include <algorithm>
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#include <chrono>
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#include <condition_variable>
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#include <deque>
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#include <memory>
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#include <mutex>
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#include <sstream>
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#include <string>
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#include <vector>
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#include "leveldb/env.h"
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#include "leveldb/slice.h"
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#include "port/port.h"
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#include "port/thread_annotations.h"
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#include "util/env_windows_test_helper.h"
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#include "util/logging.h"
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#include "util/mutexlock.h"
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#include "util/windows_logger.h"
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#if defined(DeleteFile)
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#undef DeleteFile
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#endif // defined(DeleteFile)
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namespace leveldb {
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namespace {
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constexpr const size_t kWritableFileBufferSize = 65536;
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// Up to 1000 mmaps for 64-bit binaries; none for 32-bit.
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constexpr int kDefaultMmapLimit = sizeof(void*) >= 8 ? 1000 : 0;
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// Modified by EnvWindowsTestHelper::SetReadOnlyMMapLimit().
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int g_mmap_limit = kDefaultMmapLimit;
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// Relax some file access permissions for testing.
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bool g_relax_permissions = false;
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std::string GetWindowsErrorMessage(DWORD error_code) {
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std::string message;
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char* error_text = nullptr;
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// Use MBCS version of FormatMessage to match return value.
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size_t error_text_size = ::FormatMessageA(
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FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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nullptr, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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reinterpret_cast<char*>(&error_text), 0, nullptr);
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if (!error_text) {
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return message;
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}
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message.assign(error_text, error_text_size);
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::LocalFree(error_text);
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return message;
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}
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Status WindowsError(const std::string& context, DWORD error_code) {
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if (error_code == ERROR_FILE_NOT_FOUND || error_code == ERROR_PATH_NOT_FOUND)
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return Status::NotFound(context, GetWindowsErrorMessage(error_code));
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return Status::IOError(context, GetWindowsErrorMessage(error_code));
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}
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class ScopedHandle {
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public:
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ScopedHandle(HANDLE handle) : handle_(handle) {}
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ScopedHandle(ScopedHandle&& other) noexcept : handle_(other.Release()) {}
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~ScopedHandle() { Close(); }
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ScopedHandle& operator=(ScopedHandle&& rhs) noexcept {
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if (this != &rhs) handle_ = rhs.Release();
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return *this;
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}
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bool Close() {
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if (!is_valid()) {
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return true;
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}
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HANDLE h = handle_;
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handle_ = INVALID_HANDLE_VALUE;
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return ::CloseHandle(h);
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}
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bool is_valid() const {
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return handle_ != INVALID_HANDLE_VALUE && handle_ != nullptr;
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}
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HANDLE get() const { return handle_; }
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HANDLE Release() {
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HANDLE h = handle_;
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handle_ = INVALID_HANDLE_VALUE;
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return h;
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}
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private:
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HANDLE handle_;
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};
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// Helper class to limit resource usage to avoid exhaustion.
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// Currently used to limit mmap file usage so that we do not end
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// up running out virtual memory, or running into kernel performance
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// problems for very large databases.
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class Limiter {
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public:
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// Limit maximum number of resources to |n|.
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Limiter(intptr_t n) { SetAllowed(n); }
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// If another resource is available, acquire it and return true.
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// Else return false.
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bool Acquire() LOCKS_EXCLUDED(mu_) {
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if (GetAllowed() <= 0) {
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return false;
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}
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MutexLock l(&mu_);
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intptr_t x = GetAllowed();
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if (x <= 0) {
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return false;
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} else {
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SetAllowed(x - 1);
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return true;
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}
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}
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// Release a resource acquired by a previous call to Acquire() that returned
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// true.
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void Release() LOCKS_EXCLUDED(mu_) {
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MutexLock l(&mu_);
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SetAllowed(GetAllowed() + 1);
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}
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private:
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port::Mutex mu_;
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port::AtomicPointer allowed_;
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intptr_t GetAllowed() const {
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return reinterpret_cast<intptr_t>(allowed_.Acquire_Load());
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}
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void SetAllowed(intptr_t v) EXCLUSIVE_LOCKS_REQUIRED(mu_) {
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allowed_.Release_Store(reinterpret_cast<void*>(v));
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}
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Limiter(const Limiter&);
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void operator=(const Limiter&);
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};
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class WindowsSequentialFile : public SequentialFile {
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public:
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WindowsSequentialFile(std::string fname, ScopedHandle file)
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: filename_(fname), file_(std::move(file)) {}
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~WindowsSequentialFile() override {}
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Status Read(size_t n, Slice* result, char* scratch) override {
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Status s;
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DWORD bytes_read;
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// DWORD is 32-bit, but size_t could technically be larger. However leveldb
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// files are limited to leveldb::Options::max_file_size which is clamped to
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// 1<<30 or 1 GiB.
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assert(n <= std::numeric_limits<DWORD>::max());
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if (!::ReadFile(file_.get(), scratch, static_cast<DWORD>(n), &bytes_read,
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nullptr)) {
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s = WindowsError(filename_, ::GetLastError());
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} else {
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*result = Slice(scratch, bytes_read);
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}
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return s;
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}
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Status Skip(uint64_t n) override {
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LARGE_INTEGER distance;
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distance.QuadPart = n;
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if (!::SetFilePointerEx(file_.get(), distance, nullptr, FILE_CURRENT)) {
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return WindowsError(filename_, ::GetLastError());
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}
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return Status::OK();
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}
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private:
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std::string filename_;
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ScopedHandle file_;
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};
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class WindowsRandomAccessFile : public RandomAccessFile {
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public:
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WindowsRandomAccessFile(std::string fname, ScopedHandle handle)
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: filename_(fname), handle_(std::move(handle)) {}
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~WindowsRandomAccessFile() override = default;
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Status Read(uint64_t offset, size_t n, Slice* result,
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char* scratch) const override {
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DWORD bytes_read = 0;
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OVERLAPPED overlapped = {0};
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overlapped.OffsetHigh = static_cast<DWORD>(offset >> 32);
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overlapped.Offset = static_cast<DWORD>(offset);
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if (!::ReadFile(handle_.get(), scratch, static_cast<DWORD>(n), &bytes_read,
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&overlapped)) {
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DWORD error_code = ::GetLastError();
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if (error_code != ERROR_HANDLE_EOF) {
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*result = Slice(scratch, 0);
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return Status::IOError(filename_, GetWindowsErrorMessage(error_code));
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}
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}
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*result = Slice(scratch, bytes_read);
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return Status::OK();
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}
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private:
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std::string filename_;
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ScopedHandle handle_;
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};
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class WindowsMmapReadableFile : public RandomAccessFile {
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public:
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// base[0,length-1] contains the mmapped contents of the file.
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WindowsMmapReadableFile(std::string fname, void* base, size_t length,
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Limiter* limiter)
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: filename_(std::move(fname)),
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mmapped_region_(base),
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length_(length),
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limiter_(limiter) {}
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~WindowsMmapReadableFile() override {
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::UnmapViewOfFile(mmapped_region_);
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limiter_->Release();
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}
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Status Read(uint64_t offset, size_t n, Slice* result,
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char* scratch) const override {
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Status s;
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if (offset + n > length_) {
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*result = Slice();
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s = WindowsError(filename_, ERROR_INVALID_PARAMETER);
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} else {
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*result = Slice(reinterpret_cast<char*>(mmapped_region_) + offset, n);
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}
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return s;
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}
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private:
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std::string filename_;
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void* mmapped_region_;
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size_t length_;
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Limiter* limiter_;
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};
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class WindowsWritableFile : public WritableFile {
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public:
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WindowsWritableFile(std::string fname, ScopedHandle handle)
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: filename_(std::move(fname)), handle_(std::move(handle)), pos_(0) {}
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~WindowsWritableFile() override = default;
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Status Append(const Slice& data) override {
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size_t n = data.size();
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const char* p = data.data();
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// Fit as much as possible into buffer.
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size_t copy = std::min(n, kWritableFileBufferSize - pos_);
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memcpy(buf_ + pos_, p, copy);
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p += copy;
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n -= copy;
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pos_ += copy;
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if (n == 0) {
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return Status::OK();
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}
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// Can't fit in buffer, so need to do at least one write.
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Status s = FlushBuffered();
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if (!s.ok()) {
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return s;
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}
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// Small writes go to buffer, large writes are written directly.
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if (n < kWritableFileBufferSize) {
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memcpy(buf_, p, n);
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pos_ = n;
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return Status::OK();
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}
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return WriteRaw(p, n);
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}
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Status Close() override {
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Status result = FlushBuffered();
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if (!handle_.Close() && result.ok()) {
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result = WindowsError(filename_, ::GetLastError());
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}
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return result;
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}
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Status Flush() override { return FlushBuffered(); }
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Status Sync() override {
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// On Windows no need to sync parent directory. It's metadata will be
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// updated via the creation of the new file, without an explicit sync.
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return FlushBuffered();
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}
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private:
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Status FlushBuffered() {
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Status s = WriteRaw(buf_, pos_);
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pos_ = 0;
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return s;
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}
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Status WriteRaw(const char* p, size_t n) {
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DWORD bytes_written;
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if (!::WriteFile(handle_.get(), p, static_cast<DWORD>(n), &bytes_written,
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nullptr)) {
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return Status::IOError(filename_,
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GetWindowsErrorMessage(::GetLastError()));
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}
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return Status::OK();
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}
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// buf_[0, pos_-1] contains data to be written to handle_.
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const std::string filename_;
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ScopedHandle handle_;
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char buf_[kWritableFileBufferSize];
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size_t pos_;
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};
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// Lock or unlock the entire file as specified by |lock|. Returns true
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// when successful, false upon failure. Caller should call ::GetLastError()
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// to determine cause of failure
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bool LockOrUnlock(HANDLE handle, bool lock) {
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if (lock) {
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return ::LockFile(handle,
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/*dwFileOffsetLow=*/0, /*dwFileOffsetHigh=*/0,
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/*nNumberOfBytesToLockLow=*/MAXDWORD,
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/*nNumberOfBytesToLockHigh=*/MAXDWORD);
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} else {
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return ::UnlockFile(handle,
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/*dwFileOffsetLow=*/0, /*dwFileOffsetHigh=*/0,
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/*nNumberOfBytesToLockLow=*/MAXDWORD,
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/*nNumberOfBytesToLockHigh=*/MAXDWORD);
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}
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}
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class WindowsFileLock : public FileLock {
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public:
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WindowsFileLock(ScopedHandle handle, std::string name)
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: handle_(std::move(handle)), name_(std::move(name)) {}
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ScopedHandle& handle() { return handle_; }
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const std::string& name() const { return name_; }
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private:
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ScopedHandle handle_;
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std::string name_;
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};
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class WindowsEnv : public Env {
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public:
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WindowsEnv();
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~WindowsEnv() override {
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static char msg[] = "Destroying Env::Default()\n";
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fwrite(msg, 1, sizeof(msg), stderr);
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abort();
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}
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Status NewSequentialFile(const std::string& fname,
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SequentialFile** result) override {
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*result = nullptr;
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DWORD desired_access = GENERIC_READ;
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DWORD share_mode = FILE_SHARE_READ;
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if (g_relax_permissions) {
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desired_access |= GENERIC_WRITE;
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share_mode |= FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
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}
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ScopedHandle handle =
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::CreateFileA(fname.c_str(), desired_access, share_mode, nullptr,
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OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
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if (!handle.is_valid()) {
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return WindowsError(fname, ::GetLastError());
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}
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*result = new WindowsSequentialFile(fname, std::move(handle));
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return Status::OK();
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}
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Status NewRandomAccessFile(const std::string& fname,
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RandomAccessFile** result) override {
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*result = nullptr;
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DWORD desired_access = GENERIC_READ;
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DWORD share_mode = FILE_SHARE_READ;
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if (g_relax_permissions) {
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// desired_access |= GENERIC_WRITE;
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share_mode |= FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
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}
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DWORD file_flags = FILE_ATTRIBUTE_READONLY;
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ScopedHandle handle =
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::CreateFileA(fname.c_str(), desired_access, share_mode, nullptr,
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OPEN_EXISTING, file_flags, nullptr);
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if (!handle.is_valid()) {
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return WindowsError(fname, ::GetLastError());
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}
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if (!mmap_limiter_.Acquire()) {
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*result = new WindowsRandomAccessFile(fname, std::move(handle));
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return Status::OK();
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}
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LARGE_INTEGER file_size;
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if (!::GetFileSizeEx(handle.get(), &file_size)) {
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return WindowsError(fname, ::GetLastError());
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}
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ScopedHandle mapping =
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::CreateFileMappingA(handle.get(),
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/*security attributes=*/nullptr, PAGE_READONLY,
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/*dwMaximumSizeHigh=*/0,
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/*dwMaximumSizeLow=*/0, nullptr);
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if (mapping.is_valid()) {
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void* base = MapViewOfFile(mapping.get(), FILE_MAP_READ, 0, 0, 0);
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if (base) {
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*result = new WindowsMmapReadableFile(
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fname, base, static_cast<size_t>(file_size.QuadPart),
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&mmap_limiter_);
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return Status::OK();
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}
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}
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Status s = WindowsError(fname, ::GetLastError());
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if (!s.ok()) {
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mmap_limiter_.Release();
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}
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return s;
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}
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Status NewWritableFile(const std::string& fname,
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WritableFile** result) override {
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DWORD desired_access = GENERIC_WRITE;
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DWORD share_mode = 0;
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if (g_relax_permissions) {
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desired_access |= GENERIC_READ;
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share_mode |= FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
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}
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ScopedHandle handle =
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::CreateFileA(fname.c_str(), desired_access, share_mode, nullptr,
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CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
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if (!handle.is_valid()) {
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*result = nullptr;
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return WindowsError(fname, ::GetLastError());
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}
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*result = new WindowsWritableFile(fname, std::move(handle));
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return Status::OK();
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}
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Status NewAppendableFile(const std::string& fname,
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WritableFile** result) override {
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ScopedHandle handle =
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::CreateFileA(fname.c_str(), FILE_APPEND_DATA, 0, nullptr, OPEN_ALWAYS,
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FILE_ATTRIBUTE_NORMAL, nullptr);
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if (!handle.is_valid()) {
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*result = nullptr;
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return WindowsError(fname, ::GetLastError());
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}
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*result = new WindowsWritableFile(fname, std::move(handle));
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return Status::OK();
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}
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bool FileExists(const std::string& fname) override {
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return GetFileAttributesA(fname.c_str()) != INVALID_FILE_ATTRIBUTES;
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}
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Status GetChildren(const std::string& dir,
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std::vector<std::string>* result) override {
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const std::string find_pattern = dir + "\\*";
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WIN32_FIND_DATAA find_data;
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HANDLE dir_handle = ::FindFirstFileA(find_pattern.c_str(), &find_data);
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if (dir_handle == INVALID_HANDLE_VALUE) {
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DWORD last_error = ::GetLastError();
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if (last_error == ERROR_FILE_NOT_FOUND) {
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return Status::OK();
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}
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return WindowsError(dir, last_error);
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}
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do {
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char base_name[_MAX_FNAME];
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char ext[_MAX_EXT];
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if (!_splitpath_s(find_data.cFileName, nullptr, 0, nullptr, 0, base_name,
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ARRAYSIZE(base_name), ext, ARRAYSIZE(ext))) {
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result->emplace_back(std::string(base_name) + ext);
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}
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} while (::FindNextFileA(dir_handle, &find_data));
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DWORD last_error = ::GetLastError();
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::FindClose(dir_handle);
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if (last_error != ERROR_NO_MORE_FILES) {
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return WindowsError(dir, last_error);
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}
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return Status::OK();
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}
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Status DeleteFile(const std::string& fname) override {
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if (!::DeleteFileA(fname.c_str())) {
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return WindowsError(fname, ::GetLastError());
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}
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return Status::OK();
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}
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Status CreateDir(const std::string& name) override {
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if (!::CreateDirectoryA(name.c_str(), nullptr)) {
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return WindowsError(name, ::GetLastError());
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}
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return Status::OK();
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}
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Status DeleteDir(const std::string& name) override {
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if (!::RemoveDirectoryA(name.c_str())) {
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return WindowsError(name, ::GetLastError());
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}
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return Status::OK();
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}
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|
|
Status GetFileSize(const std::string& fname, uint64_t* size) override {
|
|
WIN32_FILE_ATTRIBUTE_DATA attrs;
|
|
if (!::GetFileAttributesExA(fname.c_str(), GetFileExInfoStandard, &attrs)) {
|
|
return WindowsError(fname, ::GetLastError());
|
|
}
|
|
ULARGE_INTEGER file_size;
|
|
file_size.HighPart = attrs.nFileSizeHigh;
|
|
file_size.LowPart = attrs.nFileSizeLow;
|
|
*size = file_size.QuadPart;
|
|
return Status::OK();
|
|
}
|
|
|
|
Status RenameFile(const std::string& src,
|
|
const std::string& target) override {
|
|
// Try a simple move first. It will only succeed when |to_path| doesn't
|
|
// already exist.
|
|
if (::MoveFileA(src.c_str(), target.c_str())) {
|
|
return Status::OK();
|
|
}
|
|
DWORD move_error = ::GetLastError();
|
|
|
|
// Try the full-blown replace if the move fails, as ReplaceFile will only
|
|
// succeed when |to_path| does exist. When writing to a network share, we
|
|
// may not be able to change the ACLs. Ignore ACL errors then
|
|
// (REPLACEFILE_IGNORE_MERGE_ERRORS).
|
|
if (::ReplaceFileA(target.c_str(), src.c_str(), nullptr,
|
|
REPLACEFILE_IGNORE_MERGE_ERRORS, nullptr, nullptr)) {
|
|
return Status::OK();
|
|
}
|
|
DWORD replace_error = ::GetLastError();
|
|
// In the case of FILE_ERROR_NOT_FOUND from ReplaceFile, it is likely
|
|
// that |to_path| does not exist. In this case, the more relevant error
|
|
// comes from the call to MoveFile.
|
|
if (replace_error == ERROR_FILE_NOT_FOUND ||
|
|
replace_error == ERROR_PATH_NOT_FOUND) {
|
|
return WindowsError(src, move_error);
|
|
} else {
|
|
return WindowsError(src, replace_error);
|
|
}
|
|
}
|
|
|
|
Status LockFile(const std::string& fname, FileLock** lock) override {
|
|
*lock = nullptr;
|
|
Status result;
|
|
ScopedHandle handle = ::CreateFileA(
|
|
fname.c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ,
|
|
/*lpSecurityAttributes=*/nullptr, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL,
|
|
nullptr);
|
|
if (!handle.is_valid()) {
|
|
result = WindowsError(fname, ::GetLastError());
|
|
} else if (!LockOrUnlock(handle.get(), true)) {
|
|
result = WindowsError("lock " + fname, ::GetLastError());
|
|
} else {
|
|
*lock = new WindowsFileLock(std::move(handle), std::move(fname));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
Status UnlockFile(FileLock* lock) override {
|
|
std::unique_ptr<WindowsFileLock> my_lock(
|
|
reinterpret_cast<WindowsFileLock*>(lock));
|
|
Status result;
|
|
if (!LockOrUnlock(my_lock->handle().get(), false)) {
|
|
result = WindowsError("unlock", ::GetLastError());
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void Schedule(void (*function)(void*), void* arg) override;
|
|
|
|
void StartThread(void (*function)(void* arg), void* arg) override {
|
|
std::thread t(function, arg);
|
|
t.detach();
|
|
}
|
|
|
|
Status GetTestDirectory(std::string* result) override {
|
|
const char* env = getenv("TEST_TMPDIR");
|
|
if (env && env[0] != '\0') {
|
|
*result = env;
|
|
return Status::OK();
|
|
}
|
|
|
|
char tmp_path[MAX_PATH];
|
|
if (!GetTempPathA(ARRAYSIZE(tmp_path), tmp_path)) {
|
|
return WindowsError("GetTempPath", ::GetLastError());
|
|
}
|
|
std::stringstream ss;
|
|
ss << tmp_path << "leveldbtest-" << std::this_thread::get_id();
|
|
*result = ss.str();
|
|
|
|
// Directory may already exist
|
|
CreateDir(*result);
|
|
return Status::OK();
|
|
}
|
|
|
|
Status NewLogger(const std::string& filename, Logger** result) override {
|
|
std::FILE* fp = std::fopen(filename.c_str(), "w");
|
|
if (fp == nullptr) {
|
|
*result = nullptr;
|
|
return WindowsError("NewLogger", ::GetLastError());
|
|
} else {
|
|
*result = new WindowsLogger(fp);
|
|
return Status::OK();
|
|
}
|
|
}
|
|
|
|
uint64_t NowMicros() override {
|
|
// GetSystemTimeAsFileTime typically has a resolution of 10-20 msec.
|
|
// TODO(cmumford): Switch to GetSystemTimePreciseAsFileTime which is
|
|
// available in Windows 8 and later.
|
|
FILETIME ft;
|
|
::GetSystemTimeAsFileTime(&ft);
|
|
// Each tick represents a 100-nanosecond intervals since January 1, 1601
|
|
// (UTC).
|
|
uint64_t num_ticks =
|
|
(static_cast<uint64_t>(ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
|
|
return num_ticks / 10;
|
|
}
|
|
|
|
void SleepForMicroseconds(int micros) override {
|
|
std::this_thread::sleep_for(std::chrono::microseconds(micros));
|
|
}
|
|
|
|
private:
|
|
// BGThread() is the body of the background thread
|
|
void BGThread();
|
|
|
|
std::mutex mu_;
|
|
std::condition_variable bgsignal_;
|
|
bool started_bgthread_;
|
|
|
|
// Entry per Schedule() call
|
|
struct BGItem {
|
|
void* arg;
|
|
void (*function)(void*);
|
|
};
|
|
typedef std::deque<BGItem> BGQueue;
|
|
BGQueue queue_;
|
|
|
|
Limiter mmap_limiter_;
|
|
};
|
|
|
|
// Return the maximum number of concurrent mmaps.
|
|
int MaxMmaps() {
|
|
if (g_mmap_limit >= 0) {
|
|
return g_mmap_limit;
|
|
}
|
|
// Up to 1000 mmaps for 64-bit binaries; none for smaller pointer sizes.
|
|
g_mmap_limit = sizeof(void*) >= 8 ? 1000 : 0;
|
|
return g_mmap_limit;
|
|
}
|
|
|
|
WindowsEnv::WindowsEnv()
|
|
: started_bgthread_(false), mmap_limiter_(MaxMmaps()) {}
|
|
|
|
void WindowsEnv::Schedule(void (*function)(void*), void* arg) {
|
|
std::lock_guard<std::mutex> guard(mu_);
|
|
|
|
// Start background thread if necessary
|
|
if (!started_bgthread_) {
|
|
started_bgthread_ = true;
|
|
std::thread t(&WindowsEnv::BGThread, this);
|
|
t.detach();
|
|
}
|
|
|
|
// If the queue is currently empty, the background thread may currently be
|
|
// waiting.
|
|
if (queue_.empty()) {
|
|
bgsignal_.notify_one();
|
|
}
|
|
|
|
// Add to priority queue
|
|
queue_.push_back(BGItem());
|
|
queue_.back().function = function;
|
|
queue_.back().arg = arg;
|
|
}
|
|
|
|
void WindowsEnv::BGThread() {
|
|
while (true) {
|
|
// Wait until there is an item that is ready to run
|
|
std::unique_lock<std::mutex> lk(mu_);
|
|
bgsignal_.wait(lk, [this] { return !queue_.empty(); });
|
|
|
|
void (*function)(void*) = queue_.front().function;
|
|
void* arg = queue_.front().arg;
|
|
queue_.pop_front();
|
|
|
|
lk.unlock();
|
|
(*function)(arg);
|
|
}
|
|
}
|
|
|
|
} // namespace
|
|
|
|
static std::once_flag once;
|
|
static Env* default_env;
|
|
static void InitDefaultEnv() { default_env = new WindowsEnv(); }
|
|
|
|
void EnvWindowsTestHelper::SetReadOnlyMMapLimit(int limit) {
|
|
assert(default_env == nullptr);
|
|
g_mmap_limit = limit;
|
|
}
|
|
|
|
void EnvWindowsTestHelper::RelaxFilePermissions() {
|
|
assert(default_env == nullptr);
|
|
g_relax_permissions = true;
|
|
}
|
|
|
|
Env* Env::Default() {
|
|
std::call_once(once, InitDefaultEnv);
|
|
return default_env;
|
|
}
|
|
|
|
} // namespace leveldb
|