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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/files/drive_info.h"
#include <sys/stat.h>
#include <sys/types.h>
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
#include <linux/kdev_t.h>
#endif
namespace base {
std::optional<DriveInfo> GetFileDriveInfo(const FilePath& file_path) {
DriveInfo drive_info;
#if BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_FUCHSIA)
drive_info.has_seek_penalty = false;
return drive_info;
#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
constexpr char kRotationalFormat[] =
"/sys/dev/block/%lu:%lu/queue/rotational";
constexpr char kRemovableFormat[] = "/sys/dev/block/%lu:%lu/removable";
constexpr char kDeviceFormat[] = "/sys/dev/block/%lu:%lu";
constexpr char kSizeFormat[] = "/sys/dev/block/%lu:%lu/size";
File file(file_path, File::FLAG_OPEN | File::FLAG_READ);
if (!file.IsValid()) {
return std::nullopt;
}
struct stat path_stat;
int error = File::Fstat(file.GetPlatformFile(), &path_stat);
if (error < 0) {
return std::nullopt;
}
std::string rotational_path = StringPrintf(
kRotationalFormat, MAJOR(path_stat.st_dev), MINOR(path_stat.st_dev));
std::string removable_path = StringPrintf(
kRemovableFormat, MAJOR(path_stat.st_dev), MINOR(path_stat.st_dev));
std::string size_path = StringPrintf(kSizeFormat, MAJOR(path_stat.st_dev),
MINOR(path_stat.st_dev));
// Depending on the device, partitions may not expose the desired info. In the
// case when reading the device returned by Fstat() fails in both the
// rotational and removable attributes, attempt to crawl up one directory in
// the sysfs absolute path for the partition which was queried, which should
// give the device which contains this partition, and which should contain the
// desired info in the case where that info is not exposed for the partition
// itself.
std::string rotates;
std::string removable;
bool rotates_read = ReadFileToString(FilePath(rotational_path), &rotates);
bool removable_read = ReadFileToString(FilePath(removable_path), &removable);
if (!rotates_read && !removable_read) {
std::string device_path = StringPrintf(
kDeviceFormat, MAJOR(path_stat.st_dev), MINOR(path_stat.st_dev));
FilePath parent_device_path =
MakeAbsoluteFilePath(FilePath(device_path)).DirName();
rotates_read = ReadFileToString(
parent_device_path.Append("queue/rotational"), &rotates);
removable_read =
ReadFileToString(parent_device_path.Append("removable"), &removable);
}
if (rotates_read) {
rotates = TrimString(rotates, "\n", TrimPositions::TRIM_TRAILING);
if (rotates.length() == 1 && (rotates[0] == '0' || rotates[0] == '1')) {
drive_info.has_seek_penalty = rotates[0] == '1';
}
}
if (removable_read) {
removable = TrimString(removable, "\n", TrimPositions::TRIM_TRAILING);
if (removable.length() == 1 &&
(removable[0] == '0' || removable[0] == '1')) {
drive_info.is_removable = removable[0] == '1';
}
}
std::string size;
uint64_t bytes;
if (ReadFileToString(FilePath(size_path), &size) &&
StringToUint64(TrimString(size, "\n", TrimPositions::TRIM_TRAILING),
&bytes)) {
drive_info.size_bytes = bytes;
}
return drive_info;
#endif
}
} // namespace base
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