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Merge pull request #10729 from liamwhite/windows-is-a-meme
vfs_real: add file LRU cache for open file limits
This commit is contained in:
bunnei
GitHub
commit
ce0510913a
@ -25,6 +25,8 @@ namespace FS = Common::FS;
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namespace {
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constexpr size_t MaxOpenFiles = 512;
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constexpr FS::FileAccessMode ModeFlagsToFileAccessMode(Mode mode) {
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switch (mode) {
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case Mode::Read:
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@ -73,28 +75,30 @@ VfsEntryType RealVfsFilesystem::GetEntryType(std::string_view path_) const {
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VirtualFile RealVfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
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const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
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if (const auto weak_iter = cache.find(path); weak_iter != cache.cend()) {
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const auto& weak = weak_iter->second;
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if (!weak.expired()) {
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return std::shared_ptr<RealVfsFile>(new RealVfsFile(*this, weak.lock(), path, perms));
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if (auto it = cache.find(path); it != cache.end()) {
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if (auto file = it->second.lock(); file) {
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return file;
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}
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}
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auto backing = FS::FileOpen(path, ModeFlagsToFileAccessMode(perms), FS::FileType::BinaryFile);
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if (!backing) {
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if (!FS::Exists(path) || !FS::IsFile(path)) {
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return nullptr;
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}
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cache.insert_or_assign(path, std::move(backing));
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auto reference = std::make_unique<FileReference>();
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this->InsertReferenceIntoList(*reference);
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// Cannot use make_shared as RealVfsFile constructor is private
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return std::shared_ptr<RealVfsFile>(new RealVfsFile(*this, backing, path, perms));
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auto file =
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std::shared_ptr<RealVfsFile>(new RealVfsFile(*this, std::move(reference), path, perms));
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cache[path] = file;
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return file;
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}
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VirtualFile RealVfsFilesystem::CreateFile(std::string_view path_, Mode perms) {
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const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
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cache.erase(path);
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// Current usages of CreateFile expect to delete the contents of an existing file.
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if (FS::IsFile(path)) {
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FS::IOFile temp{path, FS::FileAccessMode::Write, FS::FileType::BinaryFile};
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@ -123,51 +127,22 @@ VirtualFile RealVfsFilesystem::CopyFile(std::string_view old_path_, std::string_
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VirtualFile RealVfsFilesystem::MoveFile(std::string_view old_path_, std::string_view new_path_) {
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const auto old_path = FS::SanitizePath(old_path_, FS::DirectorySeparator::PlatformDefault);
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const auto new_path = FS::SanitizePath(new_path_, FS::DirectorySeparator::PlatformDefault);
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const auto cached_file_iter = cache.find(old_path);
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if (cached_file_iter != cache.cend()) {
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auto file = cached_file_iter->second.lock();
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if (!cached_file_iter->second.expired()) {
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file->Close();
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}
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if (!FS::RenameFile(old_path, new_path)) {
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return nullptr;
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}
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cache.erase(old_path);
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file->Open(new_path, FS::FileAccessMode::Read, FS::FileType::BinaryFile);
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if (file->IsOpen()) {
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cache.insert_or_assign(new_path, std::move(file));
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} else {
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LOG_ERROR(Service_FS, "Failed to open path {} in order to re-cache it", new_path);
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}
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} else {
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ASSERT(false);
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cache.erase(old_path);
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cache.erase(new_path);
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if (!FS::RenameFile(old_path, new_path)) {
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return nullptr;
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}
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return OpenFile(new_path, Mode::ReadWrite);
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}
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bool RealVfsFilesystem::DeleteFile(std::string_view path_) {
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const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
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const auto cached_iter = cache.find(path);
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if (cached_iter != cache.cend()) {
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if (!cached_iter->second.expired()) {
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cached_iter->second.lock()->Close();
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}
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cache.erase(path);
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}
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cache.erase(path);
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return FS::RemoveFile(path);
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}
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VirtualDir RealVfsFilesystem::OpenDirectory(std::string_view path_, Mode perms) {
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const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
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// Cannot use make_shared as RealVfsDirectory constructor is private
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return std::shared_ptr<RealVfsDirectory>(new RealVfsDirectory(*this, path, perms));
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}
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@ -176,7 +151,6 @@ VirtualDir RealVfsFilesystem::CreateDirectory(std::string_view path_, Mode perms
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if (!FS::CreateDirs(path)) {
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return nullptr;
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}
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// Cannot use make_shared as RealVfsDirectory constructor is private
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return std::shared_ptr<RealVfsDirectory>(new RealVfsDirectory(*this, path, perms));
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}
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@ -194,73 +168,102 @@ VirtualDir RealVfsFilesystem::MoveDirectory(std::string_view old_path_,
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if (!FS::RenameDir(old_path, new_path)) {
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return nullptr;
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}
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for (auto& kv : cache) {
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// If the path in the cache doesn't start with old_path, then bail on this file.
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if (kv.first.rfind(old_path, 0) != 0) {
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continue;
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}
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const auto file_old_path =
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FS::SanitizePath(kv.first, FS::DirectorySeparator::PlatformDefault);
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auto file_new_path = FS::SanitizePath(new_path + '/' + kv.first.substr(old_path.size()),
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FS::DirectorySeparator::PlatformDefault);
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const auto& cached = cache[file_old_path];
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if (cached.expired()) {
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continue;
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}
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auto file = cached.lock();
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cache.erase(file_old_path);
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file->Open(file_new_path, FS::FileAccessMode::Read, FS::FileType::BinaryFile);
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if (file->IsOpen()) {
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cache.insert_or_assign(std::move(file_new_path), std::move(file));
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} else {
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LOG_ERROR(Service_FS, "Failed to open path {} in order to re-cache it", file_new_path);
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}
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}
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return OpenDirectory(new_path, Mode::ReadWrite);
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}
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bool RealVfsFilesystem::DeleteDirectory(std::string_view path_) {
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const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
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for (auto& kv : cache) {
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// If the path in the cache doesn't start with path, then bail on this file.
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if (kv.first.rfind(path, 0) != 0) {
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continue;
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}
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const auto& entry = cache[kv.first];
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if (!entry.expired()) {
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entry.lock()->Close();
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}
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cache.erase(kv.first);
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}
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return FS::RemoveDirRecursively(path);
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}
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RealVfsFile::RealVfsFile(RealVfsFilesystem& base_, std::shared_ptr<FS::IOFile> backing_,
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const std::string& path_, Mode perms_)
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: base(base_), backing(std::move(backing_)), path(path_), parent_path(FS::GetParentPath(path_)),
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path_components(FS::SplitPathComponents(path_)), perms(perms_) {}
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void RealVfsFilesystem::RefreshReference(const std::string& path, Mode perms,
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FileReference& reference) {
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// Temporarily remove from list.
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this->RemoveReferenceFromList(reference);
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RealVfsFile::~RealVfsFile() = default;
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// Restore file if needed.
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if (!reference.file) {
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this->EvictSingleReference();
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reference.file =
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FS::FileOpen(path, ModeFlagsToFileAccessMode(perms), FS::FileType::BinaryFile);
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if (reference.file) {
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num_open_files++;
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}
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}
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// Reinsert into list.
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this->InsertReferenceIntoList(reference);
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}
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void RealVfsFilesystem::DropReference(std::unique_ptr<FileReference>&& reference) {
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// Remove from list.
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this->RemoveReferenceFromList(*reference);
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// Close the file.
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if (reference->file) {
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reference->file.reset();
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num_open_files--;
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}
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}
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void RealVfsFilesystem::EvictSingleReference() {
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if (num_open_files < MaxOpenFiles || open_references.empty()) {
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return;
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}
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// Get and remove from list.
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auto& reference = open_references.back();
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this->RemoveReferenceFromList(reference);
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// Close the file.
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if (reference.file) {
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reference.file.reset();
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num_open_files--;
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}
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// Reinsert into closed list.
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this->InsertReferenceIntoList(reference);
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}
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void RealVfsFilesystem::InsertReferenceIntoList(FileReference& reference) {
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if (reference.file) {
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open_references.push_front(reference);
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} else {
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closed_references.push_front(reference);
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}
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}
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void RealVfsFilesystem::RemoveReferenceFromList(FileReference& reference) {
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if (reference.file) {
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open_references.erase(open_references.iterator_to(reference));
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} else {
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closed_references.erase(closed_references.iterator_to(reference));
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}
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}
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RealVfsFile::RealVfsFile(RealVfsFilesystem& base_, std::unique_ptr<FileReference> reference_,
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const std::string& path_, Mode perms_)
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: base(base_), reference(std::move(reference_)), path(path_),
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parent_path(FS::GetParentPath(path_)), path_components(FS::SplitPathComponents(path_)),
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perms(perms_) {}
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RealVfsFile::~RealVfsFile() {
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base.DropReference(std::move(reference));
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}
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std::string RealVfsFile::GetName() const {
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return path_components.back();
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}
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std::size_t RealVfsFile::GetSize() const {
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return backing->GetSize();
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base.RefreshReference(path, perms, *reference);
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return reference->file ? reference->file->GetSize() : 0;
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}
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bool RealVfsFile::Resize(std::size_t new_size) {
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return backing->SetSize(new_size);
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base.RefreshReference(path, perms, *reference);
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return reference->file ? reference->file->SetSize(new_size) : false;
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}
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VirtualDir RealVfsFile::GetContainingDirectory() const {
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@ -276,27 +279,25 @@ bool RealVfsFile::IsReadable() const {
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}
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std::size_t RealVfsFile::Read(u8* data, std::size_t length, std::size_t offset) const {
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if (!backing->Seek(static_cast<s64>(offset))) {
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base.RefreshReference(path, perms, *reference);
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if (!reference->file || !reference->file->Seek(static_cast<s64>(offset))) {
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return 0;
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}
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return backing->ReadSpan(std::span{data, length});
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return reference->file->ReadSpan(std::span{data, length});
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}
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std::size_t RealVfsFile::Write(const u8* data, std::size_t length, std::size_t offset) {
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if (!backing->Seek(static_cast<s64>(offset))) {
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base.RefreshReference(path, perms, *reference);
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if (!reference->file || !reference->file->Seek(static_cast<s64>(offset))) {
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return 0;
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}
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return backing->WriteSpan(std::span{data, length});
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return reference->file->WriteSpan(std::span{data, length});
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}
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bool RealVfsFile::Rename(std::string_view name) {
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return base.MoveFile(path, parent_path + '/' + std::string(name)) != nullptr;
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}
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void RealVfsFile::Close() {
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backing->Close();
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}
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// TODO(DarkLordZach): MSVC would not let me combine the following two functions using 'if
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// constexpr' because there is a compile error in the branch not used.
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@ -3,8 +3,9 @@
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#pragma once
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#include <map>
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#include <string_view>
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#include <boost/container/flat_map.hpp>
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#include "common/intrusive_list.h"
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#include "core/file_sys/mode.h"
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#include "core/file_sys/vfs.h"
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@ -14,6 +15,11 @@ class IOFile;
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namespace FileSys {
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struct FileReference : public Common::IntrusiveListBaseNode<FileReference> {
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std::shared_ptr<Common::FS::IOFile> file{};
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};
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class RealVfsFile;
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class RealVfsFilesystem : public VfsFilesystem {
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public:
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RealVfsFilesystem();
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@ -35,7 +41,21 @@ public:
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bool DeleteDirectory(std::string_view path) override;
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private:
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boost::container::flat_map<std::string, std::weak_ptr<Common::FS::IOFile>> cache;
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using ReferenceListType = Common::IntrusiveListBaseTraits<FileReference>::ListType;
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std::map<std::string, std::weak_ptr<VfsFile>, std::less<>> cache;
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ReferenceListType open_references;
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ReferenceListType closed_references;
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size_t num_open_files{};
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private:
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friend class RealVfsFile;
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void RefreshReference(const std::string& path, Mode perms, FileReference& reference);
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void DropReference(std::unique_ptr<FileReference>&& reference);
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void EvictSingleReference();
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private:
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void InsertReferenceIntoList(FileReference& reference);
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void RemoveReferenceFromList(FileReference& reference);
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};
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// An implementation of VfsFile that represents a file on the user's computer.
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@ -57,13 +77,11 @@ public:
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bool Rename(std::string_view name) override;
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private:
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RealVfsFile(RealVfsFilesystem& base, std::shared_ptr<Common::FS::IOFile> backing,
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RealVfsFile(RealVfsFilesystem& base, std::unique_ptr<FileReference> reference,
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const std::string& path, Mode perms = Mode::Read);
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void Close();
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RealVfsFilesystem& base;
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std::shared_ptr<Common::FS::IOFile> backing;
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std::unique_ptr<FileReference> reference;
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std::string path;
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std::string parent_path;
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std::vector<std::string> path_components;
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