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| 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/fileapi/file_system_usage_cache.h" | |
| 6 | |
| 7 #include <utility> | |
| 8 | |
| 9 #include "base/debug/trace_event.h" | |
| 10 #include "base/file_util.h" | |
| 11 #include "base/files/file_path.h" | |
| 12 #include "base/pickle.h" | |
| 13 #include "base/stl_util.h" | |
| 14 | |
| 15 namespace fileapi { | |
| 16 | |
| 17 namespace { | |
| 18 const int64 kCloseDelaySeconds = 5; | |
| 19 const size_t kMaxHandleCacheSize = 2; | |
| 20 } // namespace | |
| 21 | |
| 22 FileSystemUsageCache::FileSystemUsageCache( | |
| 23 base::SequencedTaskRunner* task_runner) | |
| 24 : weak_factory_(this), | |
| 25 task_runner_(task_runner) { | |
| 26 } | |
| 27 | |
| 28 FileSystemUsageCache::~FileSystemUsageCache() { | |
| 29 task_runner_ = NULL; | |
| 30 CloseCacheFiles(); | |
| 31 } | |
| 32 | |
| 33 const base::FilePath::CharType FileSystemUsageCache::kUsageFileName[] = | |
| 34 FILE_PATH_LITERAL(".usage"); | |
| 35 const char FileSystemUsageCache::kUsageFileHeader[] = "FSU5"; | |
| 36 const int FileSystemUsageCache::kUsageFileHeaderSize = 4; | |
| 37 | |
| 38 // Pickle::{Read,Write}Bool treat bool as int | |
| 39 const int FileSystemUsageCache::kUsageFileSize = | |
| 40 sizeof(Pickle::Header) + | |
| 41 FileSystemUsageCache::kUsageFileHeaderSize + | |
| 42 sizeof(int) + sizeof(int32) + sizeof(int64); // NOLINT | |
| 43 | |
| 44 bool FileSystemUsageCache::GetUsage(const base::FilePath& usage_file_path, | |
| 45 int64* usage_out) { | |
| 46 TRACE_EVENT0("FileSystem", "UsageCache::GetUsage"); | |
| 47 DCHECK(CalledOnValidThread()); | |
| 48 DCHECK(usage_out); | |
| 49 bool is_valid = true; | |
| 50 uint32 dirty = 0; | |
| 51 int64 usage = 0; | |
| 52 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 53 return false; | |
| 54 *usage_out = usage; | |
| 55 return true; | |
| 56 } | |
| 57 | |
| 58 bool FileSystemUsageCache::GetDirty(const base::FilePath& usage_file_path, | |
| 59 uint32* dirty_out) { | |
| 60 TRACE_EVENT0("FileSystem", "UsageCache::GetDirty"); | |
| 61 DCHECK(CalledOnValidThread()); | |
| 62 DCHECK(dirty_out); | |
| 63 bool is_valid = true; | |
| 64 uint32 dirty = 0; | |
| 65 int64 usage = 0; | |
| 66 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 67 return false; | |
| 68 *dirty_out = dirty; | |
| 69 return true; | |
| 70 } | |
| 71 | |
| 72 bool FileSystemUsageCache::IncrementDirty( | |
| 73 const base::FilePath& usage_file_path) { | |
| 74 TRACE_EVENT0("FileSystem", "UsageCache::IncrementDirty"); | |
| 75 DCHECK(CalledOnValidThread()); | |
| 76 bool is_valid = true; | |
| 77 uint32 dirty = 0; | |
| 78 int64 usage = 0; | |
| 79 bool new_handle = !HasCacheFileHandle(usage_file_path); | |
| 80 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 81 return false; | |
| 82 | |
| 83 bool success = Write(usage_file_path, is_valid, dirty + 1, usage); | |
| 84 if (success && dirty == 0 && new_handle) | |
| 85 FlushFile(usage_file_path); | |
| 86 return success; | |
| 87 } | |
| 88 | |
| 89 bool FileSystemUsageCache::DecrementDirty( | |
| 90 const base::FilePath& usage_file_path) { | |
| 91 TRACE_EVENT0("FileSystem", "UsageCache::DecrementDirty"); | |
| 92 DCHECK(CalledOnValidThread()); | |
| 93 bool is_valid = true; | |
| 94 uint32 dirty = 0; | |
| 95 int64 usage = 0;; | |
| 96 if (!Read(usage_file_path, &is_valid, &dirty, &usage) || dirty <= 0) | |
| 97 return false; | |
| 98 | |
| 99 if (dirty <= 0) | |
| 100 return false; | |
| 101 | |
| 102 return Write(usage_file_path, is_valid, dirty - 1, usage); | |
| 103 } | |
| 104 | |
| 105 bool FileSystemUsageCache::Invalidate(const base::FilePath& usage_file_path) { | |
| 106 TRACE_EVENT0("FileSystem", "UsageCache::Invalidate"); | |
| 107 DCHECK(CalledOnValidThread()); | |
| 108 bool is_valid = true; | |
| 109 uint32 dirty = 0; | |
| 110 int64 usage = 0; | |
| 111 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 112 return false; | |
| 113 | |
| 114 return Write(usage_file_path, false, dirty, usage); | |
| 115 } | |
| 116 | |
| 117 bool FileSystemUsageCache::IsValid(const base::FilePath& usage_file_path) { | |
| 118 TRACE_EVENT0("FileSystem", "UsageCache::IsValid"); | |
| 119 DCHECK(CalledOnValidThread()); | |
| 120 bool is_valid = true; | |
| 121 uint32 dirty = 0; | |
| 122 int64 usage = 0; | |
| 123 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 124 return false; | |
| 125 return is_valid; | |
| 126 } | |
| 127 | |
| 128 bool FileSystemUsageCache::AtomicUpdateUsageByDelta( | |
| 129 const base::FilePath& usage_file_path, int64 delta) { | |
| 130 TRACE_EVENT0("FileSystem", "UsageCache::AtomicUpdateUsageByDelta"); | |
| 131 DCHECK(CalledOnValidThread()); | |
| 132 bool is_valid = true; | |
| 133 uint32 dirty = 0; | |
| 134 int64 usage = 0;; | |
| 135 if (!Read(usage_file_path, &is_valid, &dirty, &usage)) | |
| 136 return false; | |
| 137 return Write(usage_file_path, is_valid, dirty, usage + delta); | |
| 138 } | |
| 139 | |
| 140 bool FileSystemUsageCache::UpdateUsage(const base::FilePath& usage_file_path, | |
| 141 int64 fs_usage) { | |
| 142 TRACE_EVENT0("FileSystem", "UsageCache::UpdateUsage"); | |
| 143 DCHECK(CalledOnValidThread()); | |
| 144 return Write(usage_file_path, true, 0, fs_usage); | |
| 145 } | |
| 146 | |
| 147 bool FileSystemUsageCache::Exists(const base::FilePath& usage_file_path) { | |
| 148 TRACE_EVENT0("FileSystem", "UsageCache::Exists"); | |
| 149 DCHECK(CalledOnValidThread()); | |
| 150 return file_util::PathExists(usage_file_path); | |
| 151 } | |
| 152 | |
| 153 bool FileSystemUsageCache::Delete(const base::FilePath& usage_file_path) { | |
| 154 TRACE_EVENT0("FileSystem", "UsageCache::Delete"); | |
| 155 DCHECK(CalledOnValidThread()); | |
| 156 CloseCacheFiles(); | |
| 157 return file_util::Delete(usage_file_path, true); | |
| 158 } | |
| 159 | |
| 160 void FileSystemUsageCache::CloseCacheFiles() { | |
| 161 TRACE_EVENT0("FileSystem", "UsageCache::CloseCacheFiles"); | |
| 162 DCHECK(CalledOnValidThread()); | |
| 163 for (CacheFiles::iterator itr = cache_files_.begin(); | |
| 164 itr != cache_files_.end(); ++itr) { | |
| 165 if (itr->second != base::kInvalidPlatformFileValue) | |
| 166 base::ClosePlatformFile(itr->second); | |
| 167 } | |
| 168 cache_files_.clear(); | |
| 169 timer_.Stop(); | |
| 170 } | |
| 171 | |
| 172 bool FileSystemUsageCache::Read(const base::FilePath& usage_file_path, | |
| 173 bool* is_valid, | |
| 174 uint32* dirty_out, | |
| 175 int64* usage_out) { | |
| 176 TRACE_EVENT0("FileSystem", "UsageCache::Read"); | |
| 177 DCHECK(CalledOnValidThread()); | |
| 178 DCHECK(is_valid); | |
| 179 DCHECK(dirty_out); | |
| 180 DCHECK(usage_out); | |
| 181 char buffer[kUsageFileSize]; | |
| 182 const char *header; | |
| 183 if (usage_file_path.empty() || | |
| 184 !ReadBytes(usage_file_path, buffer, kUsageFileSize)) | |
| 185 return false; | |
| 186 Pickle read_pickle(buffer, kUsageFileSize); | |
| 187 PickleIterator iter(read_pickle); | |
| 188 uint32 dirty = 0; | |
| 189 int64 usage = 0; | |
| 190 | |
| 191 if (!read_pickle.ReadBytes(&iter, &header, kUsageFileHeaderSize) || | |
| 192 !read_pickle.ReadBool(&iter, is_valid) || | |
| 193 !read_pickle.ReadUInt32(&iter, &dirty) || | |
| 194 !read_pickle.ReadInt64(&iter, &usage)) | |
| 195 return false; | |
| 196 | |
| 197 if (header[0] != kUsageFileHeader[0] || | |
| 198 header[1] != kUsageFileHeader[1] || | |
| 199 header[2] != kUsageFileHeader[2] || | |
| 200 header[3] != kUsageFileHeader[3]) | |
| 201 return false; | |
| 202 | |
| 203 *dirty_out = dirty; | |
| 204 *usage_out = usage; | |
| 205 return true; | |
| 206 } | |
| 207 | |
| 208 bool FileSystemUsageCache::Write(const base::FilePath& usage_file_path, | |
| 209 bool is_valid, | |
| 210 int32 dirty, | |
| 211 int64 usage) { | |
| 212 TRACE_EVENT0("FileSystem", "UsageCache::Write"); | |
| 213 DCHECK(CalledOnValidThread()); | |
| 214 Pickle write_pickle; | |
| 215 write_pickle.WriteBytes(kUsageFileHeader, kUsageFileHeaderSize); | |
| 216 write_pickle.WriteBool(is_valid); | |
| 217 write_pickle.WriteUInt32(dirty); | |
| 218 write_pickle.WriteInt64(usage); | |
| 219 | |
| 220 if (!WriteBytes(usage_file_path, | |
| 221 static_cast<const char*>(write_pickle.data()), | |
| 222 write_pickle.size())) { | |
| 223 Delete(usage_file_path); | |
| 224 return false; | |
| 225 } | |
| 226 return true; | |
| 227 } | |
| 228 | |
| 229 bool FileSystemUsageCache::GetPlatformFile(const base::FilePath& file_path, | |
| 230 base::PlatformFile* file) { | |
| 231 DCHECK(CalledOnValidThread()); | |
| 232 if (cache_files_.size() >= kMaxHandleCacheSize) | |
| 233 CloseCacheFiles(); | |
| 234 ScheduleCloseTimer(); | |
| 235 | |
| 236 std::pair<CacheFiles::iterator, bool> inserted = | |
| 237 cache_files_.insert( | |
| 238 std::make_pair(file_path, base::kInvalidPlatformFileValue)); | |
| 239 if (!inserted.second) { | |
| 240 *file = inserted.first->second; | |
| 241 return true; | |
| 242 } | |
| 243 | |
| 244 base::PlatformFileError error = base::PLATFORM_FILE_ERROR_FAILED; | |
| 245 base::PlatformFile platform_file = | |
| 246 base::CreatePlatformFile(file_path, | |
| 247 base::PLATFORM_FILE_OPEN_ALWAYS | | |
| 248 base::PLATFORM_FILE_READ | | |
| 249 base::PLATFORM_FILE_WRITE, | |
| 250 NULL, &error); | |
| 251 if (error != base::PLATFORM_FILE_OK) { | |
| 252 cache_files_.erase(inserted.first); | |
| 253 return false; | |
| 254 } | |
| 255 | |
| 256 inserted.first->second = platform_file; | |
| 257 *file = platform_file; | |
| 258 return true; | |
| 259 } | |
| 260 | |
| 261 bool FileSystemUsageCache::ReadBytes(const base::FilePath& file_path, | |
| 262 char* buffer, | |
| 263 int64 buffer_size) { | |
| 264 DCHECK(CalledOnValidThread()); | |
| 265 base::PlatformFile file; | |
| 266 if (!GetPlatformFile(file_path, &file)) | |
| 267 return false; | |
| 268 return base::ReadPlatformFile(file, 0, buffer, buffer_size) == buffer_size; | |
| 269 } | |
| 270 | |
| 271 bool FileSystemUsageCache::WriteBytes(const base::FilePath& file_path, | |
| 272 const char* buffer, | |
| 273 int64 buffer_size) { | |
| 274 DCHECK(CalledOnValidThread()); | |
| 275 base::PlatformFile file; | |
| 276 if (!GetPlatformFile(file_path, &file)) | |
| 277 return false; | |
| 278 return base::WritePlatformFile(file, 0, buffer, buffer_size) == buffer_size; | |
| 279 } | |
| 280 | |
| 281 bool FileSystemUsageCache::FlushFile(const base::FilePath& file_path) { | |
| 282 TRACE_EVENT0("FileSystem", "UsageCache::FlushFile"); | |
| 283 DCHECK(CalledOnValidThread()); | |
| 284 base::PlatformFile file = base::kInvalidPlatformFileValue; | |
| 285 return GetPlatformFile(file_path, &file) && base::FlushPlatformFile(file); | |
| 286 } | |
| 287 | |
| 288 void FileSystemUsageCache::ScheduleCloseTimer() { | |
| 289 DCHECK(CalledOnValidThread()); | |
| 290 if (timer_.IsRunning()) { | |
| 291 timer_.Reset(); | |
| 292 return; | |
| 293 } | |
| 294 | |
| 295 timer_.Start(FROM_HERE, | |
| 296 base::TimeDelta::FromSeconds(kCloseDelaySeconds), | |
| 297 base::Bind(&FileSystemUsageCache::CloseCacheFiles, | |
| 298 weak_factory_.GetWeakPtr())); | |
| 299 } | |
| 300 | |
| 301 bool FileSystemUsageCache::CalledOnValidThread() { | |
| 302 return !task_runner_ || task_runner_->RunsTasksOnCurrentThread(); | |
| 303 } | |
| 304 | |
| 305 bool FileSystemUsageCache::HasCacheFileHandle(const base::FilePath& file_path) { | |
| 306 DCHECK(CalledOnValidThread()); | |
| 307 DCHECK_LE(cache_files_.size(), kMaxHandleCacheSize); | |
| 308 return ContainsKey(cache_files_, file_path); | |
| 309 } | |
| 310 | |
| 311 } // namespace fileapi | |
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Chromium Code Reviews
Issue 14895013:
Move webkit/fileapi/file_system_mount_point_provider.h to webkit/browser/fileapi (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src