1 // Copyright (c) 2012 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/sandbox_file_stream_writer.h" 6 7 #include "base/files/file_util_proxy.h" 8 #include "base/platform_file.h" 9 #include "base/sequenced_task_runner.h" 10 #include "net/base/io_buffer.h" 11 #include "net/base/net_errors.h" 12 #include "webkit/browser/blob/local_file_stream_reader.h" 13 #include "webkit/browser/fileapi/file_observers.h" 14 #include "webkit/browser/fileapi/file_system_context.h" 15 #include "webkit/browser/fileapi/file_system_operation_runner.h" 16 #include "webkit/browser/fileapi/local_file_stream_writer.h" 17 #include "webkit/browser/quota/quota_manager.h" 18 #include "webkit/common/fileapi/file_system_util.h" 19 20 namespace fileapi { 21 22 namespace { 23 24 // Adjust the |quota| value in overwriting case (i.e. |file_size| > 0 and 25 // |file_offset| < |file_size|) to make the remaining quota calculation easier. 26 // Specifically this widens the quota for overlapping range (so that we can 27 // simply compare written bytes against the adjusted quota). 28 int64 AdjustQuotaForOverlap(int64 quota, 29 int64 file_offset, 30 int64 file_size) { 31 DCHECK_LE(file_offset, file_size); 32 if (quota < 0) 33 quota = 0; 34 int64 overlap = file_size - file_offset; 35 if (kint64max - overlap > quota) 36 quota += overlap; 37 return quota; 38 } 39 40 } // namespace 41 42 SandboxFileStreamWriter::SandboxFileStreamWriter( 43 FileSystemContext* file_system_context, 44 const FileSystemURL& url, 45 int64 initial_offset, 46 const UpdateObserverList& observers) 47 : file_system_context_(file_system_context), 48 url_(url), 49 initial_offset_(initial_offset), 50 observers_(observers), 51 file_size_(0), 52 total_bytes_written_(0), 53 allowed_bytes_to_write_(0), 54 has_pending_operation_(false), 55 default_quota_(kint64max), 56 weak_factory_(this) { 57 DCHECK(url_.is_valid()); 58 } 59 60 SandboxFileStreamWriter::~SandboxFileStreamWriter() {} 61 62 int SandboxFileStreamWriter::Write( 63 net::IOBuffer* buf, int buf_len, 64 const net::CompletionCallback& callback) { 65 has_pending_operation_ = true; 66 if (local_file_writer_) 67 return WriteInternal(buf, buf_len, callback); 68 69 net::CompletionCallback write_task = 70 base::Bind(&SandboxFileStreamWriter::DidInitializeForWrite, 71 weak_factory_.GetWeakPtr(), 72 make_scoped_refptr(buf), buf_len, callback); 73 file_system_context_->operation_runner()->CreateSnapshotFile( 74 url_, base::Bind(&SandboxFileStreamWriter::DidCreateSnapshotFile, 75 weak_factory_.GetWeakPtr(), write_task)); 76 return net::ERR_IO_PENDING; 77 } 78 79 int SandboxFileStreamWriter::Cancel(const net::CompletionCallback& callback) { 80 if (!has_pending_operation_) 81 return net::ERR_UNEXPECTED; 82 83 DCHECK(!callback.is_null()); 84 cancel_callback_ = callback; 85 return net::ERR_IO_PENDING; 86 } 87 88 int SandboxFileStreamWriter::WriteInternal( 89 net::IOBuffer* buf, int buf_len, 90 const net::CompletionCallback& callback) { 91 // allowed_bytes_to_write could be negative if the file size is 92 // greater than the current (possibly new) quota. 93 DCHECK(total_bytes_written_ <= allowed_bytes_to_write_ || 94 allowed_bytes_to_write_ < 0); 95 if (total_bytes_written_ >= allowed_bytes_to_write_) { 96 has_pending_operation_ = false; 97 return net::ERR_FILE_NO_SPACE; 98 } 99 100 if (buf_len > allowed_bytes_to_write_ - total_bytes_written_) 101 buf_len = allowed_bytes_to_write_ - total_bytes_written_; 102 103 DCHECK(local_file_writer_.get()); 104 const int result = local_file_writer_->Write( 105 buf, buf_len, 106 base::Bind(&SandboxFileStreamWriter::DidWrite, weak_factory_.GetWeakPtr(), 107 callback)); 108 if (result != net::ERR_IO_PENDING) 109 has_pending_operation_ = false; 110 return result; 111 } 112 113 void SandboxFileStreamWriter::DidCreateSnapshotFile( 114 const net::CompletionCallback& callback, 115 base::PlatformFileError file_error, 116 const base::PlatformFileInfo& file_info, 117 const base::FilePath& platform_path, 118 const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref) { 119 DCHECK(!file_ref.get()); 120 121 if (CancelIfRequested()) 122 return; 123 if (file_error != base::PLATFORM_FILE_OK) { 124 callback.Run(net::PlatformFileErrorToNetError(file_error)); 125 return; 126 } 127 if (file_info.is_directory) { 128 // We should not be writing to a directory. 129 callback.Run(net::ERR_ACCESS_DENIED); 130 return; 131 } 132 file_size_ = file_info.size; 133 if (initial_offset_ > file_size_) { 134 LOG(ERROR) << initial_offset_ << ", " << file_size_; 135 // This shouldn't happen as long as we check offset in the renderer. 136 NOTREACHED(); 137 initial_offset_ = file_size_; 138 } 139 DCHECK(!local_file_writer_.get()); 140 local_file_writer_.reset(new LocalFileStreamWriter( 141 file_system_context_->default_file_task_runner(), platform_path, 142 initial_offset_)); 143 144 quota::QuotaManagerProxy* quota_manager_proxy = 145 file_system_context_->quota_manager_proxy(); 146 if (!quota_manager_proxy) { 147 // If we don't have the quota manager or the requested filesystem type 148 // does not support quota, we should be able to let it go. 149 allowed_bytes_to_write_ = default_quota_; 150 callback.Run(net::OK); 151 return; 152 } 153 154 DCHECK(quota_manager_proxy->quota_manager()); 155 quota_manager_proxy->quota_manager()->GetUsageAndQuota( 156 url_.origin(), 157 FileSystemTypeToQuotaStorageType(url_.type()), 158 base::Bind(&SandboxFileStreamWriter::DidGetUsageAndQuota, 159 weak_factory_.GetWeakPtr(), callback)); 160 } 161 162 void SandboxFileStreamWriter::DidGetUsageAndQuota( 163 const net::CompletionCallback& callback, 164 quota::QuotaStatusCode status, 165 int64 usage, int64 quota) { 166 if (CancelIfRequested()) 167 return; 168 if (status != quota::kQuotaStatusOk) { 169 LOG(WARNING) << "Got unexpected quota error : " << status; 170 callback.Run(net::ERR_FAILED); 171 return; 172 } 173 174 allowed_bytes_to_write_ = quota - usage; 175 callback.Run(net::OK); 176 } 177 178 void SandboxFileStreamWriter::DidInitializeForWrite( 179 net::IOBuffer* buf, int buf_len, 180 const net::CompletionCallback& callback, 181 int init_status) { 182 if (CancelIfRequested()) 183 return; 184 if (init_status != net::OK) { 185 has_pending_operation_ = false; 186 callback.Run(init_status); 187 return; 188 } 189 allowed_bytes_to_write_ = AdjustQuotaForOverlap( 190 allowed_bytes_to_write_, initial_offset_, file_size_); 191 const int result = WriteInternal(buf, buf_len, callback); 192 if (result != net::ERR_IO_PENDING) 193 callback.Run(result); 194 } 195 196 void SandboxFileStreamWriter::DidWrite( 197 const net::CompletionCallback& callback, 198 int write_response) { 199 DCHECK(has_pending_operation_); 200 has_pending_operation_ = false; 201 202 if (write_response <= 0) { 203 if (CancelIfRequested()) 204 return; 205 callback.Run(write_response); 206 return; 207 } 208 209 if (total_bytes_written_ + write_response + initial_offset_ > file_size_) { 210 int overlapped = file_size_ - total_bytes_written_ - initial_offset_; 211 if (overlapped < 0) 212 overlapped = 0; 213 observers_.Notify(&FileUpdateObserver::OnUpdate, 214 MakeTuple(url_, write_response - overlapped)); 215 } 216 total_bytes_written_ += write_response; 217 218 if (CancelIfRequested()) 219 return; 220 callback.Run(write_response); 221 } 222 223 bool SandboxFileStreamWriter::CancelIfRequested() { 224 if (cancel_callback_.is_null()) 225 return false; 226 227 net::CompletionCallback pending_cancel = cancel_callback_; 228 has_pending_operation_ = false; 229 cancel_callback_.Reset(); 230 pending_cancel.Run(net::OK); 231 return true; 232 } 233 234 int SandboxFileStreamWriter::Flush(const net::CompletionCallback& callback) { 235 DCHECK(!has_pending_operation_); 236 DCHECK(cancel_callback_.is_null()); 237 238 // Write() is not called yet, so there's nothing to flush. 239 if (!local_file_writer_) 240 return net::OK; 241 242 return local_file_writer_->Flush(callback); 243 } 244 245 } // namespace fileapi 246
