Revert 113817 - Implement a proxy for Pepper FileIO.

webkit/plugins/ppapi/ppb_file_io_impl.cc

 // Copyright (c) 2011 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 "webkit/plugins/ppapi/ppb_file_io_impl.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/file_util_proxy.h"
 #include "base/message_loop_proxy.h"
 #include "base/platform_file.h"
 #include "base/logging.h"
 #include "base/time.h"
 #include "ppapi/c/ppb_file_io.h"
 #include "ppapi/c/trusted/ppb_file_io_trusted.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
-#include "ppapi/shared_impl/file_type_conversion.h"
 #include "ppapi/shared_impl/time_conversion.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_file_ref_api.h"
 #include "webkit/plugins/ppapi/common.h"
+#include "webkit/plugins/ppapi/file_type_conversions.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 #include "webkit/plugins/ppapi/ppb_file_ref_impl.h"
 #include "webkit/plugins/ppapi/quota_file_io.h"
 #include "webkit/plugins/ppapi/resource_helper.h"
 
 using ppapi::PPTimeToTime;
 using ppapi::TimeToPPTime;
+using ppapi::thunk::EnterResourceNoLock;
+using ppapi::thunk::PPB_FileIO_API;
 using ppapi::thunk::PPB_FileRef_API;
 
 namespace webkit {
 namespace ppapi {
 
+PPB_FileIO_Impl::CallbackEntry::CallbackEntry()
+    : read_buffer(NULL) {
+}
+
+PPB_FileIO_Impl::CallbackEntry::CallbackEntry(const CallbackEntry& entry)
+    : callback(entry.callback),
+      read_buffer(entry.read_buffer) {
+}
+
+PPB_FileIO_Impl::CallbackEntry::~CallbackEntry() {
+}
+
 PPB_FileIO_Impl::PPB_FileIO_Impl(PP_Instance instance)
-    : ::ppapi::PPB_FileIO_Shared(instance),
+    : Resource(instance),
       file_(base::kInvalidPlatformFileValue),
+      file_system_type_(PP_FILESYSTEMTYPE_INVALID),
+      pending_op_(OPERATION_NONE),
+      info_(NULL),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
 }
 
 PPB_FileIO_Impl::~PPB_FileIO_Impl() {
   Close();
 }
 
-int32_t PPB_FileIO_Impl::OpenValidated(PP_Resource file_ref_resource,
-                                       PPB_FileRef_API* file_ref_api,
-                                       int32_t open_flags,
-                                       PP_CompletionCallback callback) {
-  PPB_FileRef_Impl* file_ref = static_cast<PPB_FileRef_Impl*>(file_ref_api);
+PPB_FileIO_API* PPB_FileIO_Impl::AsPPB_FileIO_API() {
+  return this;
+}
+
+int32_t PPB_FileIO_Impl::Open(PP_Resource pp_file_ref,
+                              int32_t open_flags,
+                              PP_CompletionCallback callback) {
+  EnterResourceNoLock<PPB_FileRef_API> enter(pp_file_ref, true);
+  if (enter.failed())
+    return PP_ERROR_BADRESOURCE;
+  PPB_FileRef_Impl* file_ref = static_cast<PPB_FileRef_Impl*>(enter.object());
+
+  int32_t rv = CommonCallValidation(false, OPERATION_EXCLUSIVE, callback);
+  if (rv != PP_OK)
+    return rv;
 
   int flags = 0;
-  if (!::ppapi::PepperFileOpenFlagsToPlatformFileFlags(open_flags, &flags))
+  if (!PepperFileOpenFlagsToPlatformFileFlags(open_flags, &flags))
     return PP_ERROR_BADARGUMENT;
 
-  PluginDelegate* plugin_delegate = GetPluginDelegate();
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
   if (!plugin_delegate)
-    return PP_ERROR_BADARGUMENT;
+    return false;
+
+  file_system_type_ = file_ref->GetFileSystemType();
+  if (file_system_type_ != PP_FILESYSTEMTYPE_LOCALPERSISTENT &&
+      file_system_type_ != PP_FILESYSTEMTYPE_LOCALTEMPORARY &&
+      file_system_type_ != PP_FILESYSTEMTYPE_EXTERNAL)
+    return PP_ERROR_FAILED;
 
   if (file_ref->HasValidFileSystem()) {
     file_system_url_ = file_ref->GetFileSystemURL();
     if (!plugin_delegate->AsyncOpenFileSystemURL(
             file_system_url_, flags,
-            base::Bind(&PPB_FileIO_Impl::ExecutePlatformOpenFileCallback,
+            base::Bind(&PPB_FileIO_Impl::AsyncOpenFileCallback,
                        weak_factory_.GetWeakPtr())))
       return PP_ERROR_FAILED;
   } else {
     if (file_system_type_ != PP_FILESYSTEMTYPE_EXTERNAL)
       return PP_ERROR_FAILED;
     if (!plugin_delegate->AsyncOpenFile(
             file_ref->GetSystemPath(), flags,
-            base::Bind(&PPB_FileIO_Impl::ExecutePlatformOpenFileCallback,
+            base::Bind(&PPB_FileIO_Impl::AsyncOpenFileCallback,
                        weak_factory_.GetWeakPtr())))
       return PP_ERROR_FAILED;
   }
 
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
+  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL);
   return PP_OK_COMPLETIONPENDING;
 }
 
-int32_t PPB_FileIO_Impl::QueryValidated(PP_FileInfo* info,
-                                        PP_CompletionCallback callback) {
-  PluginDelegate* plugin_delegate = GetPluginDelegate();
+int32_t PPB_FileIO_Impl::Query(PP_FileInfo* info,
+                               PP_CompletionCallback callback) {
+  int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE, callback);
+  if (rv != PP_OK)
+    return rv;
+
+  if (!info)
+    return PP_ERROR_BADARGUMENT;
+
+  DCHECK(!info_);  // If |info_|, a callback should be pending (caught above).
+  info_ = info;
+
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
   if (!plugin_delegate)
     return PP_ERROR_FAILED;
 
   if (!base::FileUtilProxy::GetFileInfoFromPlatformFile(
           plugin_delegate->GetFileThreadMessageLoopProxy(), file_,
-          base::Bind(&PPB_FileIO_Impl::ExecutePlatformQueryCallback,
+          base::Bind(&PPB_FileIO_Impl::QueryInfoCallback,
                      weak_factory_.GetWeakPtr())))
     return PP_ERROR_FAILED;
 
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, info);
+  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL);
   return PP_OK_COMPLETIONPENDING;
 }
 
-int32_t PPB_FileIO_Impl::TouchValidated(PP_Time last_access_time,
-                                        PP_Time last_modified_time,
-                                        PP_CompletionCallback callback) {
-  PluginDelegate* plugin_delegate = GetPluginDelegate();
+int32_t PPB_FileIO_Impl::Touch(PP_Time last_access_time,
+                               PP_Time last_modified_time,
+                               PP_CompletionCallback callback) {
+  int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE, callback);
+  if (rv != PP_OK)
+    return rv;
+
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
   if (!plugin_delegate)
     return PP_ERROR_FAILED;
 
   if (!base::FileUtilProxy::Touch(
           plugin_delegate->GetFileThreadMessageLoopProxy(),
           file_, PPTimeToTime(last_access_time),
           PPTimeToTime(last_modified_time),
-          base::Bind(&PPB_FileIO_Impl::ExecutePlatformGeneralCallback,
+          base::Bind(&PPB_FileIO_Impl::StatusCallback,
                      weak_factory_.GetWeakPtr())))
     return PP_ERROR_FAILED;
 
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
+  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL);
   return PP_OK_COMPLETIONPENDING;
 }
 
-int32_t PPB_FileIO_Impl::ReadValidated(int64_t offset,
-                                       char* buffer,
-                                       int32_t bytes_to_read,
-                                       PP_CompletionCallback callback) {
-  PluginDelegate* plugin_delegate = GetPluginDelegate();
+int32_t PPB_FileIO_Impl::Read(int64_t offset,
+                              char* buffer,
+                              int32_t bytes_to_read,
+                              PP_CompletionCallback callback) {
+  int32_t rv = CommonCallValidation(true, OPERATION_READ, callback);
+  if (rv != PP_OK)
+    return rv;
+
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
   if (!plugin_delegate)
     return PP_ERROR_FAILED;
 
   if (!base::FileUtilProxy::Read(
           plugin_delegate->GetFileThreadMessageLoopProxy(), file_, offset,
           bytes_to_read,
-          base::Bind(&PPB_FileIO_Impl::ExecutePlatformReadCallback,
+          base::Bind(&PPB_FileIO_Impl::ReadCallback,
                      weak_factory_.GetWeakPtr())))
     return PP_ERROR_FAILED;
 
-  RegisterCallback(OPERATION_READ, callback, buffer, NULL);
+  RegisterCallback(OPERATION_READ, callback, buffer);
   return PP_OK_COMPLETIONPENDING;
 }
 
-int32_t PPB_FileIO_Impl::WriteValidated(int64_t offset,
-                                        const char* buffer,
-                                        int32_t bytes_to_write,
-                                        PP_CompletionCallback callback) {
-  PluginDelegate* plugin_delegate = GetPluginDelegate();
+int32_t PPB_FileIO_Impl::Write(int64_t offset,
+                               const char* buffer,
+                               int32_t bytes_to_write,
+                               PP_CompletionCallback callback) {
+  int32_t rv = CommonCallValidation(true, OPERATION_WRITE, callback);
+  if (rv != PP_OK)
+    return rv;
+
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
   if (!plugin_delegate)
     return PP_ERROR_FAILED;
 
   if (quota_file_io_.get()) {
     if (!quota_file_io_->Write(
             offset, buffer, bytes_to_write,
-            base::Bind(&PPB_FileIO_Impl::ExecutePlatformWriteCallback,
+            base::Bind(&PPB_FileIO_Impl::WriteCallback,
                        weak_factory_.GetWeakPtr())))
       return PP_ERROR_FAILED;
   } else {
     if (!base::FileUtilProxy::Write(
             plugin_delegate->GetFileThreadMessageLoopProxy(), file_, offset,
             buffer, bytes_to_write,
-            base::Bind(&PPB_FileIO_Impl::ExecutePlatformWriteCallback,
+            base::Bind(&PPB_FileIO_Impl::WriteCallback,
                        weak_factory_.GetWeakPtr())))
       return PP_ERROR_FAILED;
   }
 
-  RegisterCallback(OPERATION_WRITE, callback, NULL, NULL);
+  RegisterCallback(OPERATION_WRITE, callback, NULL);
   return PP_OK_COMPLETIONPENDING;
 }
 
-int32_t PPB_FileIO_Impl::SetLengthValidated(int64_t length,
-                                            PP_CompletionCallback callback) {
-  PluginDelegate* plugin_delegate = GetPluginDelegate();
+int32_t PPB_FileIO_Impl::SetLength(int64_t length,
+                                   PP_CompletionCallback callback) {
+  int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE, callback);
+  if (rv != PP_OK)
+    return rv;
+
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
   if (!plugin_delegate)
     return PP_ERROR_FAILED;
 
   if (quota_file_io_.get()) {
     if (!quota_file_io_->SetLength(
             length,
-            base::Bind(&PPB_FileIO_Impl::ExecutePlatformGeneralCallback,
+            base::Bind(&PPB_FileIO_Impl::StatusCallback,
                        weak_factory_.GetWeakPtr())))
       return PP_ERROR_FAILED;
   } else {
     if (!base::FileUtilProxy::Truncate(
             plugin_delegate->GetFileThreadMessageLoopProxy(), file_, length,
-            base::Bind(&PPB_FileIO_Impl::ExecutePlatformGeneralCallback,
+            base::Bind(&PPB_FileIO_Impl::StatusCallback,
                        weak_factory_.GetWeakPtr())))
       return PP_ERROR_FAILED;
   }
 
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
+  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL);
   return PP_OK_COMPLETIONPENDING;
 }
 
-int32_t PPB_FileIO_Impl::FlushValidated(PP_CompletionCallback callback) {
-  PluginDelegate* plugin_delegate = GetPluginDelegate();
+int32_t PPB_FileIO_Impl::Flush(PP_CompletionCallback callback) {
+  int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE, callback);
+  if (rv != PP_OK)
+    return rv;
+
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
   if (!plugin_delegate)
     return PP_ERROR_FAILED;
 
   if (!base::FileUtilProxy::Flush(
           plugin_delegate->GetFileThreadMessageLoopProxy(), file_,
-          base::Bind(&PPB_FileIO_Impl::ExecutePlatformGeneralCallback,
+          base::Bind(&PPB_FileIO_Impl::StatusCallback,
                      weak_factory_.GetWeakPtr())))
     return PP_ERROR_FAILED;
 
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
+  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL);
   return PP_OK_COMPLETIONPENDING;
 }
 
 void PPB_FileIO_Impl::Close() {
-  PluginDelegate* plugin_delegate = GetPluginDelegate();
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
   if (file_ != base::kInvalidPlatformFileValue && plugin_delegate) {
     base::FileUtilProxy::Close(
         plugin_delegate->GetFileThreadMessageLoopProxy(), file_,
         base::FileUtilProxy::StatusCallback());
     file_ = base::kInvalidPlatformFileValue;
     quota_file_io_.reset();
   }
 }
 
 int32_t PPB_FileIO_Impl::GetOSFileDescriptor() {
@@ skipping 11 matching lines @@
                                    PP_CompletionCallback callback) {
   int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE, callback);
   if (rv != PP_OK)
     return rv;
 
   if (!quota_file_io_.get())
     return PP_OK;
 
   if (!quota_file_io_->WillWrite(
           offset, bytes_to_write,
-          base::Bind(&PPB_FileIO_Impl::ExecutePlatformWillWriteCallback,
+          base::Bind(&PPB_FileIO_Impl::WillWriteCallback,
                      weak_factory_.GetWeakPtr())))
     return PP_ERROR_FAILED;
 
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
+  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL);
   return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t PPB_FileIO_Impl::WillSetLength(int64_t length,
                                        PP_CompletionCallback callback) {
   int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE, callback);
   if (rv != PP_OK)
     return rv;
 
   if (!quota_file_io_.get())
     return PP_OK;
 
   if (!quota_file_io_->WillSetLength(
           length,
-          base::Bind(&PPB_FileIO_Impl::ExecutePlatformGeneralCallback,
+          base::Bind(&PPB_FileIO_Impl::StatusCallback,
                      weak_factory_.GetWeakPtr())))
     return PP_ERROR_FAILED;
 
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
+  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL);
   return PP_OK_COMPLETIONPENDING;
 }
 
-PluginDelegate* PPB_FileIO_Impl::GetPluginDelegate() {
-  return ResourceHelper::GetPluginDelegate(this);
+int32_t PPB_FileIO_Impl::CommonCallValidation(bool should_be_open,
+                                              OperationType new_op,
+                                              PP_CompletionCallback callback) {
+  // Only asynchronous operation is supported.
+  if (!callback.func)
+    return PP_ERROR_BLOCKS_MAIN_THREAD;
+
+  if (should_be_open) {
+    if (file_ == base::kInvalidPlatformFileValue)
+      return PP_ERROR_FAILED;
+  } else {
+    if (file_ != base::kInvalidPlatformFileValue)
+      return PP_ERROR_FAILED;
+  }
+
+  if (pending_op_ != OPERATION_NONE &&
+      (pending_op_ != new_op || pending_op_ == OPERATION_EXCLUSIVE)) {
+    return PP_ERROR_INPROGRESS;
+  }
+
+  return PP_OK;
 }
 
-void PPB_FileIO_Impl::ExecutePlatformGeneralCallback(
-    base::PlatformFileError error_code) {
-  ExecuteGeneralCallback(::ppapi::PlatformFileErrorToPepperError(error_code));
+void PPB_FileIO_Impl::RegisterCallback(OperationType op,
+                                       PP_CompletionCallback callback,
+                                       char* read_buffer) {
+  DCHECK(callback.func);
+  DCHECK(pending_op_ == OPERATION_NONE ||
+         (pending_op_ != OPERATION_EXCLUSIVE && pending_op_ == op));
+
+  PluginModule* plugin_module = ResourceHelper::GetPluginModule(this);
+  if (!plugin_module)
+    return;
+
+  CallbackEntry entry;
+  entry.callback = new TrackedCompletionCallback(
+      plugin_module->GetCallbackTracker(), pp_resource(), callback);
+  entry.read_buffer = read_buffer;
+
+  callbacks_.push(entry);
+  pending_op_ = op;
 }
 
-void PPB_FileIO_Impl::ExecutePlatformOpenFileCallback(
+void PPB_FileIO_Impl::RunAndRemoveFirstPendingCallback(int32_t result) {
+  DCHECK(!callbacks_.empty());
+
+  CallbackEntry front = callbacks_.front();
+  callbacks_.pop();
+  if (callbacks_.empty())
+    pending_op_ = OPERATION_NONE;
+
+  front.callback->Run(result);  // Will complete abortively if necessary.
+}
+
+void PPB_FileIO_Impl::StatusCallback(base::PlatformFileError error_code) {
+  if (pending_op_ != OPERATION_EXCLUSIVE || callbacks_.empty()) {
+    NOTREACHED();
+    return;
+  }
+
+  RunAndRemoveFirstPendingCallback(PlatformFileErrorToPepperError(error_code));
+}
+
+void PPB_FileIO_Impl::AsyncOpenFileCallback(
     base::PlatformFileError error_code,
     base::PassPlatformFile file) {
+  if (pending_op_ != OPERATION_EXCLUSIVE || callbacks_.empty()) {
+    NOTREACHED();
+    return;
+  }
+
   DCHECK(file_ == base::kInvalidPlatformFileValue);
   file_ = file.ReleaseValue();
 
   DCHECK(!quota_file_io_.get());
   if (file_ != base::kInvalidPlatformFileValue &&
       (file_system_type_ == PP_FILESYSTEMTYPE_LOCALTEMPORARY ||
        file_system_type_ == PP_FILESYSTEMTYPE_LOCALPERSISTENT)) {
     quota_file_io_.reset(new QuotaFileIO(
         pp_instance(), file_, file_system_url_, file_system_type_));
   }
 
-  ExecuteOpenFileCallback(::ppapi::PlatformFileErrorToPepperError(error_code));
+  RunAndRemoveFirstPendingCallback(PlatformFileErrorToPepperError(error_code));
 }
 
-void PPB_FileIO_Impl::ExecutePlatformQueryCallback(
+void PPB_FileIO_Impl::QueryInfoCallback(
     base::PlatformFileError error_code,
     const base::PlatformFileInfo& file_info) {
-  PP_FileInfo pp_info;
-  pp_info.size = file_info.size;
-  pp_info.creation_time = TimeToPPTime(file_info.creation_time);
-  pp_info.last_access_time = TimeToPPTime(file_info.last_accessed);
-  pp_info.last_modified_time = TimeToPPTime(file_info.last_modified);
-  pp_info.system_type = file_system_type_;
-  if (file_info.is_directory)
-    pp_info.type = PP_FILETYPE_DIRECTORY;
-  else
-    pp_info.type = PP_FILETYPE_REGULAR;
-
-  ExecuteQueryCallback(::ppapi::PlatformFileErrorToPepperError(error_code),
-                       pp_info);
-}
-
-void PPB_FileIO_Impl::ExecutePlatformReadCallback(
-    base::PlatformFileError error_code,
-    const char* data, int bytes_read) {
-  // Map the error code, OK getting mapped to the # of bytes read.
-  int32_t pp_result = ::ppapi::PlatformFileErrorToPepperError(error_code);
-  pp_result = pp_result == PP_OK ? bytes_read : pp_result;
-  ExecuteReadCallback(pp_result, data);
-}
-
-void PPB_FileIO_Impl::ExecutePlatformWriteCallback(
-    base::PlatformFileError error_code,
-    int bytes_written) {
-  int32_t pp_result = ::ppapi::PlatformFileErrorToPepperError(error_code);
-  ExecuteGeneralCallback(pp_result == PP_OK ? bytes_written : pp_result);
-}
-
-void PPB_FileIO_Impl::ExecutePlatformWillWriteCallback(
-    base::PlatformFileError error_code,
-    int bytes_written) {
   if (pending_op_ != OPERATION_EXCLUSIVE || callbacks_.empty()) {
     NOTREACHED();
     return;
+  }
+
+  DCHECK(info_);
+  if (error_code == base::PLATFORM_FILE_OK) {
+    info_->size = file_info.size;
+    info_->creation_time = TimeToPPTime(file_info.creation_time);
+    info_->last_access_time = TimeToPPTime(file_info.last_accessed);
+    info_->last_modified_time = TimeToPPTime(file_info.last_modified);
+    info_->system_type = file_system_type_;
+    if (file_info.is_directory)
+      info_->type = PP_FILETYPE_DIRECTORY;
+    else
+      info_->type = PP_FILETYPE_REGULAR;
+  }
+  info_ = NULL;
+  RunAndRemoveFirstPendingCallback(PlatformFileErrorToPepperError(error_code));
+}
+
+void PPB_FileIO_Impl::ReadCallback(base::PlatformFileError error_code,
+                                   const char* data, int bytes_read) {
+  if (pending_op_ != OPERATION_READ || callbacks_.empty()) {
+    NOTREACHED();
+    return;
+  }
+
+  char* read_buffer = callbacks_.front().read_buffer;
+  DCHECK(data);
+  DCHECK(read_buffer);
+
+  int rv;
+  if (error_code == base::PLATFORM_FILE_OK) {
+    rv = bytes_read;
+    if (file_ != base::kInvalidPlatformFileValue)
+      memcpy(read_buffer, data, bytes_read);
+  } else {
+    rv = PlatformFileErrorToPepperError(error_code);
+  }
+
+  RunAndRemoveFirstPendingCallback(rv);
+}
+
+void PPB_FileIO_Impl::WriteCallback(base::PlatformFileError error_code,
+                                    int bytes_written) {
+  if (pending_op_ != OPERATION_WRITE || callbacks_.empty()) {
+    NOTREACHED();
+    return;
+  }
+
+  if (error_code != base::PLATFORM_FILE_OK) {
+    RunAndRemoveFirstPendingCallback(
+        PlatformFileErrorToPepperError(error_code));
+  } else {
+    RunAndRemoveFirstPendingCallback(bytes_written);
+  }
+}
+
+void PPB_FileIO_Impl::WillWriteCallback(base::PlatformFileError error_code,
+                                        int bytes_written) {
+  if (pending_op_ != OPERATION_EXCLUSIVE || callbacks_.empty()) {
+    NOTREACHED();
+    return;
   }
 
   if (error_code != base::PLATFORM_FILE_OK) {
     RunAndRemoveFirstPendingCallback(
-        ::ppapi::PlatformFileErrorToPepperError(error_code));
+        PlatformFileErrorToPepperError(error_code));
   } else {
     RunAndRemoveFirstPendingCallback(bytes_written);
   }
 }
 
 }  // namespace ppapi
 }  // namespace webkit