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// 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 "components/metrics/drive_metrics_provider.h"
#include <CoreFoundation/CoreFoundation.h>
#include <DiskArbitration/DiskArbitration.h>
#include <Foundation/Foundation.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/storage/IOStorageDeviceCharacteristics.h>
#include <stdlib.h>
#include <sys/stat.h>
#include "base/files/file_path.h"
#include "base/mac/foundation_util.h"
#include "base/mac/mac_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/mac/scoped_ioobject.h"
namespace metrics {
// static
bool DriveMetricsProvider::HasSeekPenalty(const base::FilePath& path,
bool* has_seek_penalty) {
struct stat path_stat;
if (stat(path.value().c_str(), &path_stat) < 0)
return false;
const char* dev_name = devname(path_stat.st_dev, S_IFBLK);
if (!dev_name)
return false;
std::string bsd_name("/dev/");
bsd_name.append(dev_name);
base::ScopedCFTypeRef<DASessionRef> session(
DASessionCreate(kCFAllocatorDefault));
if (!session)
return false;
base::ScopedCFTypeRef<DADiskRef> disk(
DADiskCreateFromBSDName(kCFAllocatorDefault, session, bsd_name.c_str()));
if (!disk)
return false;
base::mac::ScopedIOObject<io_object_t> io_media(DADiskCopyIOMedia(disk));
base::ScopedCFTypeRef<CFDictionaryRef> characteristics(
static_cast<CFDictionaryRef>(IORegistryEntrySearchCFProperty(
io_media, kIOServicePlane, CFSTR(kIOPropertyDeviceCharacteristicsKey),
kCFAllocatorDefault,
kIORegistryIterateRecursively | kIORegistryIterateParents)));
if (!characteristics)
return false;
CFStringRef type_ref = base::mac::GetValueFromDictionary<CFStringRef>(
characteristics, CFSTR(kIOPropertyMediumTypeKey));
if (!type_ref)
return false;
NSString* type = base::mac::CFToNSCast(type_ref);
if ([type isEqualToString:@kIOPropertyMediumTypeRotationalKey]) {
*has_seek_penalty = true;
return true;
} else if ([type isEqualToString:@kIOPropertyMediumTypeSolidStateKey]) {
*has_seek_penalty = false;
return true;
}
// TODO(dbeam): should I look for these Rotational/Solid State keys in
// |characteristics|? What if I find device characteristic but there's no
// type? Assume rotational?
return false;
}
} // namespace metrics
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