1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "webkit/browser/fileapi/quota/open_file_handle_context.h" 6 7 #include "base/file_util.h" 8 #include "webkit/browser/fileapi/quota/quota_reservation_buffer.h" 9 10 namespace fileapi { 11 12 OpenFileHandleContext::OpenFileHandleContext( 13 const base::FilePath& platform_path, 14 QuotaReservationBuffer* reservation_buffer) 15 : initial_file_size_(0), 16 maximum_written_offset_(0), 17 append_mode_write_amount_(0), 18 platform_path_(platform_path), 19 reservation_buffer_(reservation_buffer) { 20 DCHECK(sequence_checker_.CalledOnValidSequencedThread()); 21 22 base::GetFileSize(platform_path, &initial_file_size_); 23 maximum_written_offset_ = initial_file_size_; 24 } 25 26 int64 OpenFileHandleContext::UpdateMaxWrittenOffset(int64 offset) { 27 DCHECK(sequence_checker_.CalledOnValidSequencedThread()); 28 if (offset <= maximum_written_offset_) 29 return 0; 30 31 int64 growth = offset - maximum_written_offset_; 32 maximum_written_offset_ = offset; 33 return growth; 34 } 35 36 void OpenFileHandleContext::AddAppendModeWriteAmount(int64 amount) { 37 DCHECK(sequence_checker_.CalledOnValidSequencedThread()); 38 append_mode_write_amount_ += amount; 39 } 40 41 int64 OpenFileHandleContext::GetEstimatedFileSize() const { 42 DCHECK(sequence_checker_.CalledOnValidSequencedThread()); 43 return maximum_written_offset_ + append_mode_write_amount_; 44 } 45 46 int64 OpenFileHandleContext::GetMaxWrittenOffset() const { 47 DCHECK(sequence_checker_.CalledOnValidSequencedThread()); 48 return maximum_written_offset_; 49 } 50 51 OpenFileHandleContext::~OpenFileHandleContext() { 52 DCHECK(sequence_checker_.CalledOnValidSequencedThread()); 53 54 // TODO(tzik): Optimize this for single operation. 55 56 int64 file_size = 0; 57 base::GetFileSize(platform_path_, &file_size); 58 int64 usage_delta = file_size - initial_file_size_; 59 60 // |reserved_quota_consumption| may be greater than the recorded file growth 61 // when a plugin crashed before reporting its consumption. 62 // In this case, the reserved quota for the plugin should be handled as 63 // consumed quota. 64 int64 reserved_quota_consumption = 65 std::max(GetEstimatedFileSize(), file_size) - initial_file_size_; 66 67 reservation_buffer_->CommitFileGrowth( 68 reserved_quota_consumption, usage_delta); 69 reservation_buffer_->DetachOpenFileHandleContext(this); 70 } 71 72 } // namespace fileapi 73
