Unmounts volumes before writing to a drive.

chrome/browser/extensions/api/image_writer_private/operation_manager.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 "base/lazy_instance.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/image_writer_private/destroy_partitions_operation.h"
 #include "chrome/browser/extensions/api/image_writer_private/error_messages.h"
 #include "chrome/browser/extensions/api/image_writer_private/operation.h"
@@ skipping 46 matching lines @@
                                        iter->second));
   }
 }
 
 void OperationManager::StartWriteFromUrl(
     const ExtensionId& extension_id,
     GURL url,
     const std::string& hash,
     const std::string& device_path,
     const Operation::StartWriteCallback& callback) {
+#if defined(OS_CHROMEOS)
+  // Chrome OS can only support a single operation at a time.
+  if (operations_.size() > 0) {
+#else
   OperationMap::iterator existing_operation = operations_.find(extension_id);
 
   if (existing_operation != operations_.end()) {
+#endif
     return callback.Run(false, error::kOperationAlreadyInProgress);
   }
 
   scoped_refptr<Operation> operation(
       new WriteFromUrlOperation(weak_factory_.GetWeakPtr(),
                                 extension_id,
                                 browser_context_->GetRequestContext(),
                                 url,
                                 hash,
                                 device_path));
   operations_[extension_id] = operation;
   BrowserThread::PostTask(BrowserThread::FILE,
                           FROM_HERE,
                           base::Bind(&Operation::Start, operation));
   callback.Run(true, "");
 }
 
 void OperationManager::StartWriteFromFile(
     const ExtensionId& extension_id,
     const base::FilePath& path,
     const std::string& device_path,
     const Operation::StartWriteCallback& callback) {
+#if defined(OS_CHROMEOS)
+  // Chrome OS can only support a single operation at a time.
+  if (operations_.size() > 0) {
+#else
   OperationMap::iterator existing_operation = operations_.find(extension_id);
 
   if (existing_operation != operations_.end()) {
+#endif
     return callback.Run(false, error::kOperationAlreadyInProgress);
   }
 
   scoped_refptr<Operation> operation(new WriteFromFileOperation(
       weak_factory_.GetWeakPtr(), extension_id, path, device_path));
   operations_[extension_id] = operation;
   BrowserThread::PostTask(BrowserThread::FILE,
                           FROM_HERE,
                           base::Bind(&Operation::Start, operation));
   callback.Run(true, "");
@@ skipping 143 matching lines @@
     g_factory = LAZY_INSTANCE_INITIALIZER;
 
 BrowserContextKeyedAPIFactory<OperationManager>*
 OperationManager::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 
 }  // namespace image_writer
 }  // namespace extensions