15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "net/disk_cache/blockfile/mapped_file.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <errno.h> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <sys/mman.h> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "base/files/file_path.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/disk_cache/disk_cache.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace disk_cache { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 162a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void* MappedFile::Init(const base::FilePath& name, size_t size) { 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!init_); 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (init_ || !File::Init(name)) 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t temp_len = size ? size : 4096; 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!size) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size = GetLength(); 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer_ = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) platform_file(), 0); 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_ = true; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) view_size_ = size; 29116680a4aac90f2aa7413d9095a592090648e557Ben Murdoch DPLOG_IF(FATAL, buffer_ == MAP_FAILED) << "Failed to mmap " << name.value(); 30116680a4aac90f2aa7413d9095a592090648e557Ben Murdoch if (buffer_ == MAP_FAILED) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer_ = 0; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Make sure we detect hardware failures reading the headers. 34c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) scoped_ptr<char[]> temp(new char[temp_len]); 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!Read(temp.get(), temp_len, 0)) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return buffer_; 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void MappedFile::Flush() { 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)MappedFile::~MappedFile() { 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!init_) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (buffer_) { 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int ret = munmap(buffer_, view_size_); 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(0, ret); 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace disk_cache 55