Componentize DriveMetricsProvider*

chrome/browser/metrics/drive_metrics_provider_win.cc

-// Copyright 2015 The Chromium 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 "chrome/browser/metrics/drive_metrics_provider.h"
-
-#include <windows.h>
-#include <ntddscsi.h>
-#include <winioctl.h>
-#include <vector>
-
-#include "base/files/file.h"
-#include "base/files/file_path.h"
-#include "base/macros.h"
-#include "base/strings/stringprintf.h"
-#include "base/win/windows_version.h"
-
-namespace {
-
-// Semi-copy of similarly named struct from ata.h in WinDDK.
-struct IDENTIFY_DEVICE_DATA {
-  USHORT UnusedWords[217];
-  USHORT NominalMediaRotationRate;
-  USHORT MoreUnusedWords[38];
-};
-COMPILE_ASSERT(sizeof(IDENTIFY_DEVICE_DATA) == 512, IdentifyDeviceDataSize);
-
-struct AtaRequest {
-  ATA_PASS_THROUGH_EX query;
-  IDENTIFY_DEVICE_DATA result;
-};
-
-}  // namespace
-
-// static
-bool DriveMetricsProvider::HasSeekPenalty(const base::FilePath& path,
-                                          bool* has_seek_penalty) {
-  std::vector<base::FilePath::StringType> components;
-  path.GetComponents(&components);
-
-  int flags = base::File::FLAG_OPEN;
-  bool win7_or_higher = base::win::GetVersion() >= base::win::VERSION_WIN7;
-  if (!win7_or_higher)
-    flags |= base::File::FLAG_READ | base::File::FLAG_WRITE;
-
-  base::File volume(base::FilePath(L"\\\\.\\" + components[0]), flags);
-  if (!volume.IsValid())
-    return false;
-
-  if (win7_or_higher) {
-    STORAGE_PROPERTY_QUERY query = {};
-    query.QueryType = PropertyStandardQuery;
-    query.PropertyId = StorageDeviceSeekPenaltyProperty;
-
-    DEVICE_SEEK_PENALTY_DESCRIPTOR result;
-    DWORD bytes_returned;
-    BOOL success = DeviceIoControl(volume.GetPlatformFile(),
-                                   IOCTL_STORAGE_QUERY_PROPERTY,
-                                   &query, sizeof(query),
-                                   &result, sizeof(result),
-                                   &bytes_returned, NULL);
-    if (success == FALSE || bytes_returned < sizeof(result))
-      return false;
-
-    *has_seek_penalty = result.IncursSeekPenalty != FALSE;
-  } else {
-    AtaRequest request = {};
-    request.query.AtaFlags = ATA_FLAGS_DATA_IN;
-    request.query.CurrentTaskFile[6] = ID_CMD;
-    request.query.DataBufferOffset = sizeof(request.query);
-    request.query.DataTransferLength = sizeof(request.result);
-    request.query.Length = sizeof(request.query);
-    request.query.TimeOutValue = 10;
-
-    DWORD bytes_returned;
-    BOOL success = DeviceIoControl(volume.GetPlatformFile(),
-                                   IOCTL_ATA_PASS_THROUGH,
-                                   &request, sizeof(request),
-                                   &request, sizeof(request),
-                                   &bytes_returned, NULL);
-    if (success == FALSE || bytes_returned < sizeof(request) ||
-        request.query.CurrentTaskFile[0]) {
-      return false;
-    }
-
-    *has_seek_penalty = request.result.NominalMediaRotationRate != 1;
-  }
-
-  return true;
-}