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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>
- #import <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;
- }
- 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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