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vfs_real: add file LRU cache for open file limits

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This commit is contained in:
Liam
2023-06-04 18:44:50 -04:00
parent e2f6199225
commit f25236a4d6
2 changed files with 115 additions and 109 deletions
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29
src/core/file_sys/vfs_real.h
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@ -4,7 +4,7 @@
#pragma once
#include <string_view>
#include <boost/container/flat_map.hpp>
#include "common/intrusive_list.h"
#include "core/file_sys/mode.h"
#include "core/file_sys/vfs.h"
@ -14,6 +14,12 @@ class IOFile;
namespace FileSys {
struct FileReference : public Common::IntrusiveListBaseNode<FileReference> {
FileReference(std::shared_ptr<Common::FS::IOFile>&& f) : file(f) {}
std::shared_ptr<Common::FS::IOFile> file;
};
class RealVfsFile;
class RealVfsFilesystem : public VfsFilesystem {
public:
RealVfsFilesystem();
@ -35,7 +41,20 @@ public:
bool DeleteDirectory(std::string_view path) override;
private:
boost::container::flat_map<std::string, std::weak_ptr<Common::FS::IOFile>> cache;
using ReferenceListType = Common::IntrusiveListBaseTraits<FileReference>::ListType;
ReferenceListType open_references;
ReferenceListType closed_references;
size_t num_open_files{};
private:
friend class RealVfsFile;
void RefreshReference(const std::string& path, Mode perms, FileReference& reference);
void DropReference(std::unique_ptr<FileReference>&& reference);
void EvictSingleReference();
private:
void InsertReferenceIntoList(FileReference& reference);
void RemoveReferenceFromList(FileReference& reference);
};
// An implementation of VfsFile that represents a file on the user's computer.
@ -57,13 +76,11 @@ public:
bool Rename(std::string_view name) override;
private:
RealVfsFile(RealVfsFilesystem& base, std::shared_ptr<Common::FS::IOFile> backing,
RealVfsFile(RealVfsFilesystem& base, std::unique_ptr<FileReference> reference,
const std::string& path, Mode perms = Mode::Read);
void Close();
RealVfsFilesystem& base;
std::shared_ptr<Common::FS::IOFile> backing;
std::unique_ptr<FileReference> reference;
std::string path;
std::string parent_path;
std::vector<std::string> path_components;