Compute available disk space in Files.app by statvfs.f_bavail, not f_free

chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc

 // Copyright 2013 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/chromeos/extensions/file_manager/private_api_file_system.h"
 
 #include <sys/stat.h>
 #include <sys/statvfs.h>
 #include <sys/types.h>
 #include <utime.h>
@@ skipping 118 matching lines @@
 
 // Retrieves total and remaining available size on |mount_path|.
 void GetSizeStatsOnBlockingPool(const std::string& mount_path,
                                 uint64* total_size,
                                 uint64* remaining_size) {
   struct statvfs stat = {};  // Zero-clear
   if (HANDLE_EINTR(statvfs(mount_path.c_str(), &stat)) == 0) {
     *total_size =
         static_cast<uint64>(stat.f_blocks) * stat.f_frsize;
     *remaining_size =
-        static_cast<uint64>(stat.f_bfree) * stat.f_frsize;
+        static_cast<uint64>(stat.f_bavail) * stat.f_frsize;
   }
 }
 
 // Retrieves the maximum file name length of the file system of |path|.
 // Returns 0 if it could not be queried.
 size_t GetFileNameMaxLengthOnBlockingPool(const std::string& path) {
   struct statvfs stat = {};
   if (statvfs(path.c_str(), &stat) != 0) {
     // The filesystem seems not supporting statvfs(). Assume it to be a commonly
     // used bound 255, and log the failure.
@@ skipping 442 matching lines @@
       render_view_host(), profile(), GURL(volume_file_url));
   if (file_path.empty())
     return false;
 
   DiskMountManager::GetInstance()->FormatMountedDevice(file_path.value());
   SendResponse(true);
   return true;
 }
 
 }  // namespace file_manager