Index: chrome/browser/metrics/drive_metrics_provider_linux.cc |
diff --git a/chrome/browser/metrics/drive_metrics_provider_linux.cc b/chrome/browser/metrics/drive_metrics_provider_linux.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..93c37a037d6744f404bb977971f0836e91c80555 |
--- /dev/null |
+++ b/chrome/browser/metrics/drive_metrics_provider_linux.cc |
@@ -0,0 +1,60 @@ |
+// 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 <linux/kdev_t.h> // For MAJOR()/MINOR(). |
+#include <sys/stat.h> |
+#include <string> |
+ |
+#include "base/files/file.h" |
+#include "base/files/file_path.h" |
+#include "base/files/file_util.h" |
+#include "base/strings/stringprintf.h" |
+ |
+#if defined(OS_CHROMEOS) |
+#include "base/sys_info.h" |
+#endif |
+ |
+namespace { |
+ |
+// See http://www.kernel.org/doc/Documentation/devices.txt for more info. |
+const int kFirstScsiMajorNumber = 8; |
+const int kPartitionsPerScsiDevice = 16; |
+const char kRotationalFormat[] = "/sys/block/sd%c/queue/rotational"; |
+ |
+} // namespace |
+ |
+// static |
+bool DriveMetricsProvider::HasSeekPenalty(const base::FilePath& path, |
+ bool* has_seek_penalty) { |
+#if defined(OS_CHROMEOS) |
+ std::string board = base::SysInfo::GetLsbReleaseBoard(); |
+ if (board != "unknown" && board != "parrot") { |
+ // All ChromeOS devices have SSDs. Except some parrots. |
+ *has_seek_penalty = false; |
+ return true; |
+ } |
+#endif |
+ |
+ base::File file(path, base::File::FLAG_OPEN | base::File::FLAG_READ); |
+ if (!file.IsValid()) |
+ return false; |
+ |
+ struct stat path_stat; |
+ int error = fstat(file.GetPlatformFile(), &path_stat); |
+ if (error < 0 || MAJOR(path_stat.st_dev) != kFirstScsiMajorNumber) { |
+ // TODO(dbeam): support more SCSI major numbers (e.g. /dev/sdq+) and LVM? |
+ return false; |
+ } |
+ |
+ char sdX = 'a' + MINOR(path_stat.st_dev) / kPartitionsPerScsiDevice; |
+ std::string rotational_path = base::StringPrintf(kRotationalFormat, sdX); |
+ std::string rotates; |
+ if (!base::ReadFileToString(base::FilePath(rotational_path), &rotates)) |
+ return false; |
+ |
+ *has_seek_penalty = rotates.substr(0, 1) == "1"; |
+ return true; |
+} |