Prevent formatting a device being mounted in read-only mode.

chromeos/disks/disk_mount_manager.cc

 // Copyright (c) 2012 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 "chromeos/disks/disk_mount_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 105 matching lines @@
       return;
     }
 
     std::string device_path = mount_point->second.source_path;
     DiskMap::const_iterator disk = disks_.find(device_path);
     if (disk == disks_.end()) {
       LOG(ERROR) << "Device with path \"" << device_path << "\" not found.";
       OnFormatCompleted(FORMAT_ERROR_UNKNOWN, device_path);
       return;
     }
+    if (disk->second->is_read_only()) {
+      LOG(ERROR) << "Mount point with path \"" << mount_path
+                 << "\" is read-only.";
+      OnFormatCompleted(FORMAT_ERROR_DEVICE_NOT_ALLOWED, mount_path);
+      return;
+    }
 
     UnmountPath(disk->second->mount_path(),
                 UNMOUNT_OPTIONS_NONE,
                 base::Bind(&DiskMountManagerImpl::OnUnmountPathForFormat,
                            weak_ptr_factory_.GetWeakPtr(),
                            device_path));
   }
 
   // DiskMountManager override.
   void UnmountDeviceRecursively(
@@ skipping 621 matching lines @@
   VLOG(1) << "DiskMountManager Shutdown completed";
 }
 
 // static
 DiskMountManager* DiskMountManager::GetInstance() {
   return g_disk_mount_manager;
 }
 
 }  // namespace disks
 }  // namespace chromeos