Reorganize net/disk_cache into backend specific directories.

net/disk_cache/mapped_file_posix.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 "net/disk_cache/mapped_file.h"
-
-#include <errno.h>
-#include <sys/mman.h>
-
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "net/disk_cache/disk_cache.h"
-
-namespace disk_cache {
-
-void* MappedFile::Init(const base::FilePath& name, size_t size) {
-  DCHECK(!init_);
-  if (init_ || !File::Init(name))
-    return NULL;
-
-  size_t temp_len = size ? size : 4096;
-  if (!size)
-    size = GetLength();
-
-  buffer_ = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED,
-                 platform_file(), 0);
-  init_ = true;
-  view_size_ = size;
-  DCHECK(reinterpret_cast<intptr_t>(buffer_) != -1);
-  if (reinterpret_cast<intptr_t>(buffer_) == -1)
-    buffer_ = 0;
-
-  // Make sure we detect hardware failures reading the headers.
-  scoped_ptr<char[]> temp(new char[temp_len]);
-  if (!Read(temp.get(), temp_len, 0))
-    return NULL;
-
-  return buffer_;
-}
-
-void MappedFile::Flush() {
-}
-
-MappedFile::~MappedFile() {
-  if (!init_)
-    return;
-
-  if (buffer_) {
-    int ret = munmap(buffer_, view_size_);
-    DCHECK_EQ(0, ret);
-  }
-}
-
-}  // namespace disk_cache