Merge pull request #12707 from FearlessTobi/fs-housekeeping

fs: Various cleanups & add path class for later use

35 files changed, 792 insertions, 627 deletions

diff --git a/src/core/hle/result.h b/src/core/hle/result.h
index 749f51f69..316370266 100644
--- a/src/core/hle/result.h
+++ b/src/core/hle/result.h
@@ -189,14 +189,14 @@ enum class ErrorModule : u32 {
 union Result {
     u32 raw;
 
-    BitField<0, 9, ErrorModule> module;
-    BitField<9, 13, u32> description;
+    using Module = BitField<0, 9, ErrorModule>;
+    using Description = BitField<9, 13, u32>;
 
     Result() = default;
     constexpr explicit Result(u32 raw_) : raw(raw_) {}
 
     constexpr Result(ErrorModule module_, u32 description_)
-        : raw(module.FormatValue(module_) | description.FormatValue(description_)) {}
+        : raw(Module::FormatValue(module_) | Description::FormatValue(description_)) {}
 
     [[nodiscard]] constexpr bool IsSuccess() const {
         return raw == 0;
@@ -211,7 +211,15 @@ union Result {
     }
 
     [[nodiscard]] constexpr u32 GetInnerValue() const {
-        return static_cast<u32>(module.Value()) | (description << module.bits);
+        return raw;
+    }
+
+    [[nodiscard]] constexpr ErrorModule GetModule() const {
+        return Module::ExtractValue(raw);
+    }
+
+    [[nodiscard]] constexpr u32 GetDescription() const {
+        return Description::ExtractValue(raw);
     }
 
     [[nodiscard]] constexpr bool Includes(Result result) const {
@@ -274,8 +282,9 @@ public:
     }
 
     [[nodiscard]] constexpr bool Includes(Result other) const {
-        return code.module == other.module && code.description <= other.description &&
-               other.description <= description_end;
+        return code.GetModule() == other.GetModule() &&
+               code.GetDescription() <= other.GetDescription() &&
+               other.GetDescription() <= description_end;
     }
 
 private:
@@ -330,6 +339,16 @@ constexpr bool EvaluateResultFailure(const Result& r) {
     return R_FAILED(r);
 }
 
+template <auto... R>
+constexpr bool EvaluateAnyResultIncludes(const Result& r) {
+    return ((r == R) || ...);
+}
+
+template <auto... R>
+constexpr bool EvaluateResultNotIncluded(const Result& r) {
+    return !EvaluateAnyResultIncludes<R...>(r);
+}
+
 template <typename T>
 constexpr void UpdateCurrentResultReference(T result_reference, Result result) = delete;
 // Intentionally not defined
@@ -371,6 +390,13 @@ constexpr void UpdateCurrentResultReference<const Result>(Result result_referenc
     DECLARE_CURRENT_RESULT_REFERENCE_AND_STORAGE(__COUNTER__);                                     \
     ON_RESULT_SUCCESS_2
 
+#define ON_RESULT_INCLUDED_2(...)                                                                  \
+    ON_RESULT_RETURN_IMPL(ResultImpl::EvaluateAnyResultIncludes<__VA_ARGS__>)
+
+#define ON_RESULT_INCLUDED(...)                                                                    \
+    DECLARE_CURRENT_RESULT_REFERENCE_AND_STORAGE(__COUNTER__);                                     \
+    ON_RESULT_INCLUDED_2(__VA_ARGS__)
+
 constexpr inline Result __TmpCurrentResultReference = ResultSuccess;
 
 /// Returns a result.
diff --git a/src/core/hle/service/am/applets/applet_error.cpp b/src/core/hle/service/am/applets/applet_error.cpp
index 5d17c353f..084bc138c 100644
--- a/src/core/hle/service/am/applets/applet_error.cpp
+++ b/src/core/hle/service/am/applets/applet_error.cpp
@@ -27,8 +27,8 @@ struct ErrorCode {
 
     static constexpr ErrorCode FromResult(Result result) {
         return {
-            .error_category{2000 + static_cast<u32>(result.module.Value())},
-            .error_number{result.description.Value()},
+            .error_category{2000 + static_cast<u32>(result.GetModule())},
+            .error_number{result.GetDescription()},
         };
     }
 
diff --git a/src/core/hle/service/am/applets/applet_web_browser.cpp b/src/core/hle/service/am/applets/applet_web_browser.cpp
index b0ea2b381..19057ad7b 100644
--- a/src/core/hle/service/am/applets/applet_web_browser.cpp
+++ b/src/core/hle/service/am/applets/applet_web_browser.cpp
@@ -9,13 +9,13 @@
 #include "common/string_util.h"
 #include "core/core.h"
 #include "core/file_sys/content_archive.h"
-#include "core/file_sys/mode.h"
+#include "core/file_sys/fs_filesystem.h"
 #include "core/file_sys/nca_metadata.h"
 #include "core/file_sys/patch_manager.h"
 #include "core/file_sys/registered_cache.h"
 #include "core/file_sys/romfs.h"
 #include "core/file_sys/system_archive/system_archive.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 #include "core/frontend/applets/web_browser.h"
 #include "core/hle/result.h"
 #include "core/hle/service/am/am.h"
@@ -213,7 +213,7 @@ void ExtractSharedFonts(Core::System& system) {
             std::move(decrypted_data), DECRYPTED_SHARED_FONTS[i]);
 
         const auto temp_dir = system.GetFilesystem()->CreateDirectory(
-            Common::FS::PathToUTF8String(fonts_dir), FileSys::Mode::ReadWrite);
+            Common::FS::PathToUTF8String(fonts_dir), FileSys::OpenMode::ReadWrite);
 
         const auto out_file = temp_dir->CreateFile(DECRYPTED_SHARED_FONTS[i]);
 
@@ -333,7 +333,7 @@ void WebBrowser::ExtractOfflineRomFS() {
     const auto extracted_romfs_dir = FileSys::ExtractRomFS(offline_romfs);
 
     const auto temp_dir = system.GetFilesystem()->CreateDirectory(
-        Common::FS::PathToUTF8String(offline_cache_dir), FileSys::Mode::ReadWrite);
+        Common::FS::PathToUTF8String(offline_cache_dir), FileSys::OpenMode::ReadWrite);
 
     FileSys::VfsRawCopyD(extracted_romfs_dir, temp_dir);
 }
diff --git a/src/core/hle/service/am/applets/applet_web_browser.h b/src/core/hle/service/am/applets/applet_web_browser.h
index 99fe18659..36adb2510 100644
--- a/src/core/hle/service/am/applets/applet_web_browser.h
+++ b/src/core/hle/service/am/applets/applet_web_browser.h
@@ -7,7 +7,7 @@
 #include <optional>
 
 #include "common/common_types.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 #include "core/hle/result.h"
 #include "core/hle/service/am/applets/applet_web_browser_types.h"
 #include "core/hle/service/am/applets/applets.h"
diff --git a/src/core/hle/service/audio/audren_u.cpp b/src/core/hle/service/audio/audren_u.cpp
index bd4ca753b..05581e6e0 100644
--- a/src/core/hle/service/audio/audren_u.cpp
+++ b/src/core/hle/service/audio/audren_u.cpp
@@ -139,7 +139,8 @@ private:
                 ctx.WriteBufferC(performance_buffer.data(), performance_buffer.size(), 1);
             }
         } else {
-            LOG_ERROR(Service_Audio, "RequestUpdate failed error 0x{:02X}!", result.description);
+            LOG_ERROR(Service_Audio, "RequestUpdate failed error 0x{:02X}!",
+                      result.GetDescription());
         }
 
         IPC::ResponseBuilder rb{ctx, 2};
diff --git a/src/core/hle/service/bcat/backend/backend.h b/src/core/hle/service/bcat/backend/backend.h
index 205ed0702..aa36d29d5 100644
--- a/src/core/hle/service/bcat/backend/backend.h
+++ b/src/core/hle/service/bcat/backend/backend.h
@@ -8,7 +8,7 @@
 #include <string>
 
 #include "common/common_types.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 #include "core/hle/result.h"
 #include "core/hle/service/kernel_helpers.h"
 
diff --git a/src/core/hle/service/bcat/bcat_module.cpp b/src/core/hle/service/bcat/bcat_module.cpp
index a6281913a..76d7bb139 100644
--- a/src/core/hle/service/bcat/bcat_module.cpp
+++ b/src/core/hle/service/bcat/bcat_module.cpp
@@ -8,7 +8,7 @@
 #include "common/settings.h"
 #include "common/string_util.h"
 #include "core/core.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/hle/kernel/k_readable_event.h"
 #include "core/hle/service/bcat/backend/backend.h"
 #include "core/hle/service/bcat/bcat.h"
diff --git a/src/core/hle/service/caps/caps_a.cpp b/src/core/hle/service/caps/caps_a.cpp
index 9925720a3..69acb3a8b 100644
--- a/src/core/hle/service/caps/caps_a.cpp
+++ b/src/core/hle/service/caps/caps_a.cpp
@@ -202,14 +202,14 @@ Result IAlbumAccessorService::TranslateResult(Result in_result) {
     }
 
     if ((in_result.raw & 0x3801ff) == ResultUnknown1024.raw) {
-        if (in_result.description - 0x514 < 100) {
+        if (in_result.GetDescription() - 0x514 < 100) {
             return ResultInvalidFileData;
         }
-        if (in_result.description - 0x5dc < 100) {
+        if (in_result.GetDescription() - 0x5dc < 100) {
             return ResultInvalidFileData;
         }
 
-        if (in_result.description - 0x578 < 100) {
+        if (in_result.GetDescription() - 0x578 < 100) {
             if (in_result == ResultFileCountLimit) {
                 return ResultUnknown22;
             }
@@ -244,9 +244,10 @@ Result IAlbumAccessorService::TranslateResult(Result in_result) {
         return ResultUnknown1024;
     }
 
-    if (in_result.module == ErrorModule::FS) {
-        if ((in_result.description >> 0xc < 0x7d) || (in_result.description - 1000 < 2000) ||
-            (((in_result.description - 3000) >> 3) < 0x271)) {
+    if (in_result.GetModule() == ErrorModule::FS) {
+        if ((in_result.GetDescription() >> 0xc < 0x7d) ||
+            (in_result.GetDescription() - 1000 < 2000) ||
+            (((in_result.GetDescription() - 3000) >> 3) < 0x271)) {
             // TODO: Translate FS error
             return in_result;
         }
diff --git a/src/core/hle/service/fatal/fatal.cpp b/src/core/hle/service/fatal/fatal.cpp
index 31da86074..dfcac1ffd 100644
--- a/src/core/hle/service/fatal/fatal.cpp
+++ b/src/core/hle/service/fatal/fatal.cpp
@@ -73,8 +73,8 @@ static void GenerateErrorReport(Core::System& system, Result error_code, const F
         "Program entry point:             0x{:16X}\n"
         "\n",
         Common::g_scm_branch, Common::g_scm_desc, title_id, error_code.raw,
-        2000 + static_cast<u32>(error_code.module.Value()),
-        static_cast<u32>(error_code.description.Value()), info.set_flags, info.program_entry_point);
+        2000 + static_cast<u32>(error_code.GetModule()),
+        static_cast<u32>(error_code.GetDescription()), info.set_flags, info.program_entry_point);
     if (info.backtrace_size != 0x0) {
         crash_report += "Registers:\n";
         for (size_t i = 0; i < info.registers.size(); i++) {
diff --git a/src/core/hle/service/filesystem/filesystem.cpp b/src/core/hle/service/filesystem/filesystem.cpp
index ca6d8d607..ae230afc0 100644
--- a/src/core/hle/service/filesystem/filesystem.cpp
+++ b/src/core/hle/service/filesystem/filesystem.cpp
@@ -12,18 +12,17 @@
 #include "core/file_sys/card_image.h"
 #include "core/file_sys/control_metadata.h"
 #include "core/file_sys/errors.h"
-#include "core/file_sys/mode.h"
 #include "core/file_sys/patch_manager.h"
 #include "core/file_sys/registered_cache.h"
 #include "core/file_sys/romfs_factory.h"
 #include "core/file_sys/savedata_factory.h"
 #include "core/file_sys/sdmc_factory.h"
-#include "core/file_sys/vfs.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 #include "core/hle/service/filesystem/filesystem.h"
-#include "core/hle/service/filesystem/fsp_ldr.h"
-#include "core/hle/service/filesystem/fsp_pr.h"
-#include "core/hle/service/filesystem/fsp_srv.h"
+#include "core/hle/service/filesystem/fsp/fsp_ldr.h"
+#include "core/hle/service/filesystem/fsp/fsp_pr.h"
+#include "core/hle/service/filesystem/fsp/fsp_srv.h"
 #include "core/hle/service/filesystem/romfs_controller.h"
 #include "core/hle/service/filesystem/save_data_controller.h"
 #include "core/hle/service/server_manager.h"
@@ -53,12 +52,12 @@ Result VfsDirectoryServiceWrapper::CreateFile(const std::string& path_, u64 size
     std::string path(Common::FS::SanitizePath(path_));
     auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
     if (dir == nullptr) {
-        return FileSys::ERROR_PATH_NOT_FOUND;
+        return FileSys::ResultPathNotFound;
     }
 
-    FileSys::EntryType entry_type{};
+    FileSys::DirectoryEntryType entry_type{};
     if (GetEntryType(&entry_type, path) == ResultSuccess) {
-        return FileSys::ERROR_PATH_ALREADY_EXISTS;
+        return FileSys::ResultPathAlreadyExists;
     }
 
     auto file = dir->CreateFile(Common::FS::GetFilename(path));
@@ -82,7 +81,7 @@ Result VfsDirectoryServiceWrapper::DeleteFile(const std::string& path_) const {
 
     auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
     if (dir == nullptr || dir->GetFile(Common::FS::GetFilename(path)) == nullptr) {
-        return FileSys::ERROR_PATH_NOT_FOUND;
+        return FileSys::ResultPathNotFound;
     }
     if (!dir->DeleteFile(Common::FS::GetFilename(path))) {
         // TODO(DarkLordZach): Find a better error code for this
@@ -153,12 +152,12 @@ Result VfsDirectoryServiceWrapper::RenameFile(const std::string& src_path_,
     if (Common::FS::GetParentPath(src_path) == Common::FS::GetParentPath(dest_path)) {
         // Use more-optimized vfs implementation rename.
         if (src == nullptr) {
-            return FileSys::ERROR_PATH_NOT_FOUND;
+            return FileSys::ResultPathNotFound;
         }
 
         if (dst && Common::FS::Exists(dst->GetFullPath())) {
             LOG_ERROR(Service_FS, "File at new_path={} already exists", dst->GetFullPath());
-            return FileSys::ERROR_PATH_ALREADY_EXISTS;
+            return FileSys::ResultPathAlreadyExists;
         }
 
         if (!src->Rename(Common::FS::GetFilename(dest_path))) {
@@ -195,7 +194,7 @@ Result VfsDirectoryServiceWrapper::RenameDirectory(const std::string& src_path_,
     if (Common::FS::GetParentPath(src_path) == Common::FS::GetParentPath(dest_path)) {
         // Use more-optimized vfs implementation rename.
         if (src == nullptr)
-            return FileSys::ERROR_PATH_NOT_FOUND;
+            return FileSys::ResultPathNotFound;
         if (!src->Rename(Common::FS::GetFilename(dest_path))) {
             // TODO(DarkLordZach): Find a better error code for this
             return ResultUnknown;
@@ -214,7 +213,8 @@ Result VfsDirectoryServiceWrapper::RenameDirectory(const std::string& src_path_,
 }
 
 Result VfsDirectoryServiceWrapper::OpenFile(FileSys::VirtualFile* out_file,
-                                            const std::string& path_, FileSys::Mode mode) const {
+                                            const std::string& path_,
+                                            FileSys::OpenMode mode) const {
     const std::string path(Common::FS::SanitizePath(path_));
     std::string_view npath = path;
     while (!npath.empty() && (npath[0] == '/' || npath[0] == '\\')) {
@@ -223,10 +223,10 @@ Result VfsDirectoryServiceWrapper::OpenFile(FileSys::VirtualFile* out_file,
 
     auto file = backing->GetFileRelative(npath);
     if (file == nullptr) {
-        return FileSys::ERROR_PATH_NOT_FOUND;
+        return FileSys::ResultPathNotFound;
     }
 
-    if (mode == FileSys::Mode::Append) {
+    if (mode == FileSys::OpenMode::AllowAppend) {
         *out_file = std::make_shared<FileSys::OffsetVfsFile>(file, 0, file->GetSize());
     } else {
         *out_file = file;
@@ -241,50 +241,50 @@ Result VfsDirectoryServiceWrapper::OpenDirectory(FileSys::VirtualDir* out_direct
     auto dir = GetDirectoryRelativeWrapped(backing, path);
     if (dir == nullptr) {
         // TODO(DarkLordZach): Find a better error code for this
-        return FileSys::ERROR_PATH_NOT_FOUND;
+        return FileSys::ResultPathNotFound;
     }
     *out_directory = dir;
     return ResultSuccess;
 }
 
-Result VfsDirectoryServiceWrapper::GetEntryType(FileSys::EntryType* out_entry_type,
+Result VfsDirectoryServiceWrapper::GetEntryType(FileSys::DirectoryEntryType* out_entry_type,
                                                 const std::string& path_) const {
     std::string path(Common::FS::SanitizePath(path_));
     auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
     if (dir == nullptr) {
-        return FileSys::ERROR_PATH_NOT_FOUND;
+        return FileSys::ResultPathNotFound;
     }
 
     auto filename = Common::FS::GetFilename(path);
     // TODO(Subv): Some games use the '/' path, find out what this means.
     if (filename.empty()) {
-        *out_entry_type = FileSys::EntryType::Directory;
+        *out_entry_type = FileSys::DirectoryEntryType::Directory;
         return ResultSuccess;
     }
 
     if (dir->GetFile(filename) != nullptr) {
-        *out_entry_type = FileSys::EntryType::File;
+        *out_entry_type = FileSys::DirectoryEntryType::File;
         return ResultSuccess;
     }
 
     if (dir->GetSubdirectory(filename) != nullptr) {
-        *out_entry_type = FileSys::EntryType::Directory;
+        *out_entry_type = FileSys::DirectoryEntryType::Directory;
         return ResultSuccess;
     }
 
-    return FileSys::ERROR_PATH_NOT_FOUND;
+    return FileSys::ResultPathNotFound;
 }
 
 Result VfsDirectoryServiceWrapper::GetFileTimeStampRaw(
     FileSys::FileTimeStampRaw* out_file_time_stamp_raw, const std::string& path) const {
     auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
     if (dir == nullptr) {
-        return FileSys::ERROR_PATH_NOT_FOUND;
+        return FileSys::ResultPathNotFound;
     }
 
-    FileSys::EntryType entry_type;
+    FileSys::DirectoryEntryType entry_type;
     if (GetEntryType(&entry_type, path) != ResultSuccess) {
-        return FileSys::ERROR_PATH_NOT_FOUND;
+        return FileSys::ResultPathNotFound;
     }
 
     *out_file_time_stamp_raw = dir->GetFileTimeStamp(Common::FS::GetFilename(path));
@@ -317,7 +317,7 @@ Result FileSystemController::OpenProcess(
 
     const auto it = registrations.find(process_id);
     if (it == registrations.end()) {
-        return FileSys::ERROR_ENTITY_NOT_FOUND;
+        return FileSys::ResultTargetNotFound;
     }
 
     *out_program_id = it->second.program_id;
@@ -347,7 +347,7 @@ std::shared_ptr<SaveDataController> FileSystemController::OpenSaveDataController
 std::shared_ptr<FileSys::SaveDataFactory> FileSystemController::CreateSaveDataFactory(
     ProgramId program_id) {
     using YuzuPath = Common::FS::YuzuPath;
-    const auto rw_mode = FileSys::Mode::ReadWrite;
+    const auto rw_mode = FileSys::OpenMode::ReadWrite;
 
     auto vfs = system.GetFilesystem();
     const auto nand_directory =
@@ -360,12 +360,12 @@ Result FileSystemController::OpenSDMC(FileSys::VirtualDir* out_sdmc) const {
     LOG_TRACE(Service_FS, "Opening SDMC");
 
     if (sdmc_factory == nullptr) {
-        return FileSys::ERROR_SD_CARD_NOT_FOUND;
+        return FileSys::ResultPortSdCardNoDevice;
     }
 
     auto sdmc = sdmc_factory->Open();
     if (sdmc == nullptr) {
-        return FileSys::ERROR_SD_CARD_NOT_FOUND;
+        return FileSys::ResultPortSdCardNoDevice;
     }
 
     *out_sdmc = sdmc;
@@ -377,12 +377,12 @@ Result FileSystemController::OpenBISPartition(FileSys::VirtualDir* out_bis_parti
     LOG_TRACE(Service_FS, "Opening BIS Partition with id={:08X}", id);
 
     if (bis_factory == nullptr) {
-        return FileSys::ERROR_ENTITY_NOT_FOUND;
+        return FileSys::ResultTargetNotFound;
     }
 
     auto part = bis_factory->OpenPartition(id);
     if (part == nullptr) {
-        return FileSys::ERROR_INVALID_ARGUMENT;
+        return FileSys::ResultInvalidArgument;
     }
 
     *out_bis_partition = part;
@@ -394,12 +394,12 @@ Result FileSystemController::OpenBISPartitionStorage(
     LOG_TRACE(Service_FS, "Opening BIS Partition Storage with id={:08X}", id);
 
     if (bis_factory == nullptr) {
-        return FileSys::ERROR_ENTITY_NOT_FOUND;
+        return FileSys::ResultTargetNotFound;
     }
 
     auto part = bis_factory->OpenPartitionStorage(id, system.GetFilesystem());
     if (part == nullptr) {
-        return FileSys::ERROR_INVALID_ARGUMENT;
+        return FileSys::ResultInvalidArgument;
     }
 
     *out_bis_partition_storage = part;
@@ -686,15 +686,15 @@ void FileSystemController::CreateFactories(FileSys::VfsFilesystem& vfs, bool ove
     using YuzuPath = Common::FS::YuzuPath;
     const auto sdmc_dir_path = Common::FS::GetYuzuPath(YuzuPath::SDMCDir);
     const auto sdmc_load_dir_path = sdmc_dir_path / "atmosphere/contents";
-    const auto rw_mode = FileSys::Mode::ReadWrite;
+    const auto rw_mode = FileSys::OpenMode::ReadWrite;
 
     auto nand_directory =
         vfs.OpenDirectory(Common::FS::GetYuzuPathString(YuzuPath::NANDDir), rw_mode);
     auto sd_directory = vfs.OpenDirectory(Common::FS::PathToUTF8String(sdmc_dir_path), rw_mode);
-    auto load_directory =
-        vfs.OpenDirectory(Common::FS::GetYuzuPathString(YuzuPath::LoadDir), FileSys::Mode::Read);
-    auto sd_load_directory =
-        vfs.OpenDirectory(Common::FS::PathToUTF8String(sdmc_load_dir_path), FileSys::Mode::Read);
+    auto load_directory = vfs.OpenDirectory(Common::FS::GetYuzuPathString(YuzuPath::LoadDir),
+                                            FileSys::OpenMode::Read);
+    auto sd_load_directory = vfs.OpenDirectory(Common::FS::PathToUTF8String(sdmc_load_dir_path),
+                                               FileSys::OpenMode::Read);
     auto dump_directory =
         vfs.OpenDirectory(Common::FS::GetYuzuPathString(YuzuPath::DumpDir), rw_mode);
 
diff --git a/src/core/hle/service/filesystem/filesystem.h b/src/core/hle/service/filesystem/filesystem.h
index 48f37d289..718500385 100644
--- a/src/core/hle/service/filesystem/filesystem.h
+++ b/src/core/hle/service/filesystem/filesystem.h
@@ -4,9 +4,11 @@
 #pragma once
 
 #include <memory>
+#include <mutex>
 #include "common/common_types.h"
-#include "core/file_sys/directory.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/fs_directory.h"
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/hle/result.h"
 
 namespace Core {
@@ -26,7 +28,6 @@ class XCI;
 
 enum class BisPartitionId : u32;
 enum class ContentRecordType : u8;
-enum class Mode : u32;
 enum class SaveDataSpaceId : u8;
 enum class SaveDataType : u8;
 enum class StorageId : u8;
@@ -57,13 +58,6 @@ enum class ImageDirectoryId : u32 {
     SdCard,
 };
 
-enum class OpenDirectoryMode : u64 {
-    Directory = (1 << 0),
-    File = (1 << 1),
-    All = Directory | File
-};
-DECLARE_ENUM_FLAG_OPERATORS(OpenDirectoryMode);
-
 using ProcessId = u64;
 using ProgramId = u64;
 
@@ -237,7 +231,7 @@ public:
      * @return Opened file, or error code
      */
     Result OpenFile(FileSys::VirtualFile* out_file, const std::string& path,
-                    FileSys::Mode mode) const;
+                    FileSys::OpenMode mode) const;
 
     /**
      * Open a directory specified by its path
@@ -250,7 +244,7 @@ public:
      * Get the type of the specified path
      * @return The type of the specified path or error code
      */
-    Result GetEntryType(FileSys::EntryType* out_entry_type, const std::string& path) const;
+    Result GetEntryType(FileSys::DirectoryEntryType* out_entry_type, const std::string& path) const;
 
     /**
      * Get the timestamp of the specified path
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_directory.cpp b/src/core/hle/service/filesystem/fsp/fs_i_directory.cpp
new file mode 100644
index 000000000..39690018b
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_directory.cpp
@@ -0,0 +1,84 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/savedata_factory.h"
+#include "core/hle/service/filesystem/fsp/fs_i_directory.h"
+#include "core/hle/service/ipc_helpers.h"
+
+namespace Service::FileSystem {
+
+template <typename T>
+static void BuildEntryIndex(std::vector<FileSys::DirectoryEntry>& entries,
+                            const std::vector<T>& new_data, FileSys::DirectoryEntryType type) {
+    entries.reserve(entries.size() + new_data.size());
+
+    for (const auto& new_entry : new_data) {
+        auto name = new_entry->GetName();
+
+        if (type == FileSys::DirectoryEntryType::File &&
+            name == FileSys::GetSaveDataSizeFileName()) {
+            continue;
+        }
+
+        entries.emplace_back(name, static_cast<s8>(type),
+                             type == FileSys::DirectoryEntryType::Directory ? 0
+                                                                            : new_entry->GetSize());
+    }
+}
+
+IDirectory::IDirectory(Core::System& system_, FileSys::VirtualDir backend_,
+                       FileSys::OpenDirectoryMode mode)
+    : ServiceFramework{system_, "IDirectory"}, backend(std::move(backend_)) {
+    static const FunctionInfo functions[] = {
+        {0, &IDirectory::Read, "Read"},
+        {1, &IDirectory::GetEntryCount, "GetEntryCount"},
+    };
+    RegisterHandlers(functions);
+
+    // TODO(DarkLordZach): Verify that this is the correct behavior.
+    // Build entry index now to save time later.
+    if (True(mode & FileSys::OpenDirectoryMode::Directory)) {
+        BuildEntryIndex(entries, backend->GetSubdirectories(),
+                        FileSys::DirectoryEntryType::Directory);
+    }
+    if (True(mode & FileSys::OpenDirectoryMode::File)) {
+        BuildEntryIndex(entries, backend->GetFiles(), FileSys::DirectoryEntryType::File);
+    }
+}
+
+void IDirectory::Read(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called.");
+
+    // Calculate how many entries we can fit in the output buffer
+    const u64 count_entries = ctx.GetWriteBufferNumElements<FileSys::DirectoryEntry>();
+
+    // Cap at total number of entries.
+    const u64 actual_entries = std::min(count_entries, entries.size() - next_entry_index);
+
+    // Determine data start and end
+    const auto* begin = reinterpret_cast<u8*>(entries.data() + next_entry_index);
+    const auto* end = reinterpret_cast<u8*>(entries.data() + next_entry_index + actual_entries);
+    const auto range_size = static_cast<std::size_t>(std::distance(begin, end));
+
+    next_entry_index += actual_entries;
+
+    // Write the data to memory
+    ctx.WriteBuffer(begin, range_size);
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.Push(actual_entries);
+}
+
+void IDirectory::GetEntryCount(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    u64 count = entries.size() - next_entry_index;
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.Push(count);
+}
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_directory.h b/src/core/hle/service/filesystem/fsp/fs_i_directory.h
new file mode 100644
index 000000000..793ecfcd7
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_directory.h
@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/vfs/vfs.h"
+#include "core/hle/service/filesystem/filesystem.h"
+#include "core/hle/service/service.h"
+
+namespace FileSys {
+struct DirectoryEntry;
+}
+
+namespace Service::FileSystem {
+
+class IDirectory final : public ServiceFramework<IDirectory> {
+public:
+    explicit IDirectory(Core::System& system_, FileSys::VirtualDir backend_,
+                        FileSys::OpenDirectoryMode mode);
+
+private:
+    FileSys::VirtualDir backend;
+    std::vector<FileSys::DirectoryEntry> entries;
+    u64 next_entry_index = 0;
+
+    void Read(HLERequestContext& ctx);
+    void GetEntryCount(HLERequestContext& ctx);
+};
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_file.cpp b/src/core/hle/service/filesystem/fsp/fs_i_file.cpp
new file mode 100644
index 000000000..9a18f6ec5
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_file.cpp
@@ -0,0 +1,127 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/file_sys/errors.h"
+#include "core/hle/service/filesystem/fsp/fs_i_file.h"
+#include "core/hle/service/ipc_helpers.h"
+
+namespace Service::FileSystem {
+
+IFile::IFile(Core::System& system_, FileSys::VirtualFile backend_)
+    : ServiceFramework{system_, "IFile"}, backend(std::move(backend_)) {
+    static const FunctionInfo functions[] = {
+        {0, &IFile::Read, "Read"},
+        {1, &IFile::Write, "Write"},
+        {2, &IFile::Flush, "Flush"},
+        {3, &IFile::SetSize, "SetSize"},
+        {4, &IFile::GetSize, "GetSize"},
+        {5, nullptr, "OperateRange"},
+        {6, nullptr, "OperateRangeWithBuffer"},
+    };
+    RegisterHandlers(functions);
+}
+
+void IFile::Read(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const u64 option = rp.Pop<u64>();
+    const s64 offset = rp.Pop<s64>();
+    const s64 length = rp.Pop<s64>();
+
+    LOG_DEBUG(Service_FS, "called, option={}, offset=0x{:X}, length={}", option, offset, length);
+
+    // Error checking
+    if (length < 0) {
+        LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(FileSys::ResultInvalidSize);
+        return;
+    }
+    if (offset < 0) {
+        LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(FileSys::ResultInvalidOffset);
+        return;
+    }
+
+    // Read the data from the Storage backend
+    std::vector<u8> output = backend->ReadBytes(length, offset);
+
+    // Write the data to memory
+    ctx.WriteBuffer(output);
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.Push(static_cast<u64>(output.size()));
+}
+
+void IFile::Write(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const u64 option = rp.Pop<u64>();
+    const s64 offset = rp.Pop<s64>();
+    const s64 length = rp.Pop<s64>();
+
+    LOG_DEBUG(Service_FS, "called, option={}, offset=0x{:X}, length={}", option, offset, length);
+
+    // Error checking
+    if (length < 0) {
+        LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(FileSys::ResultInvalidSize);
+        return;
+    }
+    if (offset < 0) {
+        LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(FileSys::ResultInvalidOffset);
+        return;
+    }
+
+    const auto data = ctx.ReadBuffer();
+
+    ASSERT_MSG(static_cast<s64>(data.size()) <= length,
+               "Attempting to write more data than requested (requested={:016X}, actual={:016X}).",
+               length, data.size());
+
+    // Write the data to the Storage backend
+    const auto write_size =
+        static_cast<std::size_t>(std::distance(data.begin(), data.begin() + length));
+    const std::size_t written = backend->Write(data.data(), write_size, offset);
+
+    ASSERT_MSG(static_cast<s64>(written) == length,
+               "Could not write all bytes to file (requested={:016X}, actual={:016X}).", length,
+               written);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IFile::Flush(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    // Exists for SDK compatibiltity -- No need to flush file.
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IFile::SetSize(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const u64 size = rp.Pop<u64>();
+    LOG_DEBUG(Service_FS, "called, size={}", size);
+
+    backend->Resize(size);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IFile::GetSize(HLERequestContext& ctx) {
+    const u64 size = backend->GetSize();
+    LOG_DEBUG(Service_FS, "called, size={}", size);
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.Push<u64>(size);
+}
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_file.h b/src/core/hle/service/filesystem/fsp/fs_i_file.h
new file mode 100644
index 000000000..5e5430c67
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_file.h
@@ -0,0 +1,25 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/filesystem/filesystem.h"
+#include "core/hle/service/service.h"
+
+namespace Service::FileSystem {
+
+class IFile final : public ServiceFramework<IFile> {
+public:
+    explicit IFile(Core::System& system_, FileSys::VirtualFile backend_);
+
+private:
+    FileSys::VirtualFile backend;
+
+    void Read(HLERequestContext& ctx);
+    void Write(HLERequestContext& ctx);
+    void Flush(HLERequestContext& ctx);
+    void SetSize(HLERequestContext& ctx);
+    void GetSize(HLERequestContext& ctx);
+};
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_filesystem.cpp b/src/core/hle/service/filesystem/fsp/fs_i_filesystem.cpp
new file mode 100644
index 000000000..efa394dd1
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_filesystem.cpp
@@ -0,0 +1,262 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/string_util.h"
+#include "core/hle/service/filesystem/fsp/fs_i_directory.h"
+#include "core/hle/service/filesystem/fsp/fs_i_file.h"
+#include "core/hle/service/filesystem/fsp/fs_i_filesystem.h"
+#include "core/hle/service/ipc_helpers.h"
+
+namespace Service::FileSystem {
+
+IFileSystem::IFileSystem(Core::System& system_, FileSys::VirtualDir backend_, SizeGetter size_)
+    : ServiceFramework{system_, "IFileSystem"}, backend{std::move(backend_)}, size{std::move(
+                                                                                  size_)} {
+    static const FunctionInfo functions[] = {
+        {0, &IFileSystem::CreateFile, "CreateFile"},
+        {1, &IFileSystem::DeleteFile, "DeleteFile"},
+        {2, &IFileSystem::CreateDirectory, "CreateDirectory"},
+        {3, &IFileSystem::DeleteDirectory, "DeleteDirectory"},
+        {4, &IFileSystem::DeleteDirectoryRecursively, "DeleteDirectoryRecursively"},
+        {5, &IFileSystem::RenameFile, "RenameFile"},
+        {6, nullptr, "RenameDirectory"},
+        {7, &IFileSystem::GetEntryType, "GetEntryType"},
+        {8, &IFileSystem::OpenFile, "OpenFile"},
+        {9, &IFileSystem::OpenDirectory, "OpenDirectory"},
+        {10, &IFileSystem::Commit, "Commit"},
+        {11, &IFileSystem::GetFreeSpaceSize, "GetFreeSpaceSize"},
+        {12, &IFileSystem::GetTotalSpaceSize, "GetTotalSpaceSize"},
+        {13, &IFileSystem::CleanDirectoryRecursively, "CleanDirectoryRecursively"},
+        {14, &IFileSystem::GetFileTimeStampRaw, "GetFileTimeStampRaw"},
+        {15, nullptr, "QueryEntry"},
+        {16, &IFileSystem::GetFileSystemAttribute, "GetFileSystemAttribute"},
+    };
+    RegisterHandlers(functions);
+}
+
+void IFileSystem::CreateFile(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    const u64 file_mode = rp.Pop<u64>();
+    const u32 file_size = rp.Pop<u32>();
+
+    LOG_DEBUG(Service_FS, "called. file={}, mode=0x{:X}, size=0x{:08X}", name, file_mode,
+              file_size);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(backend.CreateFile(name, file_size));
+}
+
+void IFileSystem::DeleteFile(HLERequestContext& ctx) {
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    LOG_DEBUG(Service_FS, "called. file={}", name);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(backend.DeleteFile(name));
+}
+
+void IFileSystem::CreateDirectory(HLERequestContext& ctx) {
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    LOG_DEBUG(Service_FS, "called. directory={}", name);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(backend.CreateDirectory(name));
+}
+
+void IFileSystem::DeleteDirectory(HLERequestContext& ctx) {
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    LOG_DEBUG(Service_FS, "called. directory={}", name);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(backend.DeleteDirectory(name));
+}
+
+void IFileSystem::DeleteDirectoryRecursively(HLERequestContext& ctx) {
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    LOG_DEBUG(Service_FS, "called. directory={}", name);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(backend.DeleteDirectoryRecursively(name));
+}
+
+void IFileSystem::CleanDirectoryRecursively(HLERequestContext& ctx) {
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    LOG_DEBUG(Service_FS, "called. Directory: {}", name);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(backend.CleanDirectoryRecursively(name));
+}
+
+void IFileSystem::RenameFile(HLERequestContext& ctx) {
+    const std::string src_name = Common::StringFromBuffer(ctx.ReadBuffer(0));
+    const std::string dst_name = Common::StringFromBuffer(ctx.ReadBuffer(1));
+
+    LOG_DEBUG(Service_FS, "called. file '{}' to file '{}'", src_name, dst_name);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(backend.RenameFile(src_name, dst_name));
+}
+
+void IFileSystem::OpenFile(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    const auto mode = static_cast<FileSys::OpenMode>(rp.Pop<u32>());
+
+    LOG_DEBUG(Service_FS, "called. file={}, mode={}", name, mode);
+
+    FileSys::VirtualFile vfs_file{};
+    auto result = backend.OpenFile(&vfs_file, name, mode);
+    if (result != ResultSuccess) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(result);
+        return;
+    }
+
+    auto file = std::make_shared<IFile>(system, vfs_file);
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<IFile>(std::move(file));
+}
+
+void IFileSystem::OpenDirectory(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+    const auto mode = rp.PopRaw<FileSys::OpenDirectoryMode>();
+
+    LOG_DEBUG(Service_FS, "called. directory={}, mode={}", name, mode);
+
+    FileSys::VirtualDir vfs_dir{};
+    auto result = backend.OpenDirectory(&vfs_dir, name);
+    if (result != ResultSuccess) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(result);
+        return;
+    }
+
+    auto directory = std::make_shared<IDirectory>(system, vfs_dir, mode);
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<IDirectory>(std::move(directory));
+}
+
+void IFileSystem::GetEntryType(HLERequestContext& ctx) {
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    LOG_DEBUG(Service_FS, "called. file={}", name);
+
+    FileSys::DirectoryEntryType vfs_entry_type{};
+    auto result = backend.GetEntryType(&vfs_entry_type, name);
+    if (result != ResultSuccess) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(result);
+        return;
+    }
+
+    IPC::ResponseBuilder rb{ctx, 3};
+    rb.Push(ResultSuccess);
+    rb.Push<u32>(static_cast<u32>(vfs_entry_type));
+}
+
+void IFileSystem::Commit(HLERequestContext& ctx) {
+    LOG_WARNING(Service_FS, "(STUBBED) called");
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IFileSystem::GetFreeSpaceSize(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.Push(size.get_free_size());
+}
+
+void IFileSystem::GetTotalSpaceSize(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.Push(size.get_total_size());
+}
+
+void IFileSystem::GetFileTimeStampRaw(HLERequestContext& ctx) {
+    const auto file_buffer = ctx.ReadBuffer();
+    const std::string name = Common::StringFromBuffer(file_buffer);
+
+    LOG_WARNING(Service_FS, "(Partial Implementation) called. file={}", name);
+
+    FileSys::FileTimeStampRaw vfs_timestamp{};
+    auto result = backend.GetFileTimeStampRaw(&vfs_timestamp, name);
+    if (result != ResultSuccess) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(result);
+        return;
+    }
+
+    IPC::ResponseBuilder rb{ctx, 10};
+    rb.Push(ResultSuccess);
+    rb.PushRaw(vfs_timestamp);
+}
+
+void IFileSystem::GetFileSystemAttribute(HLERequestContext& ctx) {
+    LOG_WARNING(Service_FS, "(STUBBED) called");
+
+    struct FileSystemAttribute {
+        u8 dir_entry_name_length_max_defined;
+        u8 file_entry_name_length_max_defined;
+        u8 dir_path_name_length_max_defined;
+        u8 file_path_name_length_max_defined;
+        INSERT_PADDING_BYTES_NOINIT(0x5);
+        u8 utf16_dir_entry_name_length_max_defined;
+        u8 utf16_file_entry_name_length_max_defined;
+        u8 utf16_dir_path_name_length_max_defined;
+        u8 utf16_file_path_name_length_max_defined;
+        INSERT_PADDING_BYTES_NOINIT(0x18);
+        s32 dir_entry_name_length_max;
+        s32 file_entry_name_length_max;
+        s32 dir_path_name_length_max;
+        s32 file_path_name_length_max;
+        INSERT_PADDING_WORDS_NOINIT(0x5);
+        s32 utf16_dir_entry_name_length_max;
+        s32 utf16_file_entry_name_length_max;
+        s32 utf16_dir_path_name_length_max;
+        s32 utf16_file_path_name_length_max;
+        INSERT_PADDING_WORDS_NOINIT(0x18);
+        INSERT_PADDING_WORDS_NOINIT(0x1);
+    };
+    static_assert(sizeof(FileSystemAttribute) == 0xc0, "FileSystemAttribute has incorrect size");
+
+    FileSystemAttribute savedata_attribute{};
+    savedata_attribute.dir_entry_name_length_max_defined = true;
+    savedata_attribute.file_entry_name_length_max_defined = true;
+    savedata_attribute.dir_entry_name_length_max = 0x40;
+    savedata_attribute.file_entry_name_length_max = 0x40;
+
+    IPC::ResponseBuilder rb{ctx, 50};
+    rb.Push(ResultSuccess);
+    rb.PushRaw(savedata_attribute);
+}
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_filesystem.h b/src/core/hle/service/filesystem/fsp/fs_i_filesystem.h
new file mode 100644
index 000000000..b06b3ef0e
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_filesystem.h
@@ -0,0 +1,38 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/vfs/vfs.h"
+#include "core/hle/service/filesystem/filesystem.h"
+#include "core/hle/service/filesystem/fsp/fsp_util.h"
+#include "core/hle/service/service.h"
+
+namespace Service::FileSystem {
+
+class IFileSystem final : public ServiceFramework<IFileSystem> {
+public:
+    explicit IFileSystem(Core::System& system_, FileSys::VirtualDir backend_, SizeGetter size_);
+
+    void CreateFile(HLERequestContext& ctx);
+    void DeleteFile(HLERequestContext& ctx);
+    void CreateDirectory(HLERequestContext& ctx);
+    void DeleteDirectory(HLERequestContext& ctx);
+    void DeleteDirectoryRecursively(HLERequestContext& ctx);
+    void CleanDirectoryRecursively(HLERequestContext& ctx);
+    void RenameFile(HLERequestContext& ctx);
+    void OpenFile(HLERequestContext& ctx);
+    void OpenDirectory(HLERequestContext& ctx);
+    void GetEntryType(HLERequestContext& ctx);
+    void Commit(HLERequestContext& ctx);
+    void GetFreeSpaceSize(HLERequestContext& ctx);
+    void GetTotalSpaceSize(HLERequestContext& ctx);
+    void GetFileTimeStampRaw(HLERequestContext& ctx);
+    void GetFileSystemAttribute(HLERequestContext& ctx);
+
+private:
+    VfsDirectoryServiceWrapper backend;
+    SizeGetter size;
+};
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_storage.cpp b/src/core/hle/service/filesystem/fsp/fs_i_storage.cpp
new file mode 100644
index 000000000..98223c1f9
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_storage.cpp
@@ -0,0 +1,62 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/file_sys/errors.h"
+#include "core/hle/service/filesystem/fsp/fs_i_storage.h"
+#include "core/hle/service/ipc_helpers.h"
+
+namespace Service::FileSystem {
+
+IStorage::IStorage(Core::System& system_, FileSys::VirtualFile backend_)
+    : ServiceFramework{system_, "IStorage"}, backend(std::move(backend_)) {
+    static const FunctionInfo functions[] = {
+        {0, &IStorage::Read, "Read"},
+        {1, nullptr, "Write"},
+        {2, nullptr, "Flush"},
+        {3, nullptr, "SetSize"},
+        {4, &IStorage::GetSize, "GetSize"},
+        {5, nullptr, "OperateRange"},
+    };
+    RegisterHandlers(functions);
+}
+
+void IStorage::Read(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const s64 offset = rp.Pop<s64>();
+    const s64 length = rp.Pop<s64>();
+
+    LOG_DEBUG(Service_FS, "called, offset=0x{:X}, length={}", offset, length);
+
+    // Error checking
+    if (length < 0) {
+        LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(FileSys::ResultInvalidSize);
+        return;
+    }
+    if (offset < 0) {
+        LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(FileSys::ResultInvalidOffset);
+        return;
+    }
+
+    // Read the data from the Storage backend
+    std::vector<u8> output = backend->ReadBytes(length, offset);
+    // Write the data to memory
+    ctx.WriteBuffer(output);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void IStorage::GetSize(HLERequestContext& ctx) {
+    const u64 size = backend->GetSize();
+    LOG_DEBUG(Service_FS, "called, size={}", size);
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.Push<u64>(size);
+}
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fs_i_storage.h b/src/core/hle/service/filesystem/fsp/fs_i_storage.h
new file mode 100644
index 000000000..cb5bebcc9
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_storage.h
@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/vfs/vfs.h"
+#include "core/hle/service/filesystem/filesystem.h"
+#include "core/hle/service/service.h"
+
+namespace Service::FileSystem {
+
+class IStorage final : public ServiceFramework<IStorage> {
+public:
+    explicit IStorage(Core::System& system_, FileSys::VirtualFile backend_);
+
+private:
+    FileSys::VirtualFile backend;
+
+    void Read(HLERequestContext& ctx);
+    void GetSize(HLERequestContext& ctx);
+};
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp_ldr.cpp b/src/core/hle/service/filesystem/fsp/fsp_ldr.cpp
index 1e3366e71..8ee733f47 100644
--- a/src/core/hle/service/filesystem/fsp_ldr.cpp
+++ b/src/core/hle/service/filesystem/fsp/fsp_ldr.cpp
@@ -1,7 +1,7 @@
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "core/hle/service/filesystem/fsp_ldr.h"
+#include "core/hle/service/filesystem/fsp/fsp_ldr.h"
 
 namespace Service::FileSystem {
 
diff --git a/src/core/hle/service/filesystem/fsp_ldr.h b/src/core/hle/service/filesystem/fsp/fsp_ldr.h
index 358739a87..358739a87 100644
--- a/src/core/hle/service/filesystem/fsp_ldr.h
+++ b/src/core/hle/service/filesystem/fsp/fsp_ldr.h
diff --git a/src/core/hle/service/filesystem/fsp_pr.cpp b/src/core/hle/service/filesystem/fsp/fsp_pr.cpp
index 4ffc31977..7c03ebaea 100644
--- a/src/core/hle/service/filesystem/fsp_pr.cpp
+++ b/src/core/hle/service/filesystem/fsp/fsp_pr.cpp
@@ -1,7 +1,7 @@
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "core/hle/service/filesystem/fsp_pr.h"
+#include "core/hle/service/filesystem/fsp/fsp_pr.h"
 
 namespace Service::FileSystem {
 
diff --git a/src/core/hle/service/filesystem/fsp_pr.h b/src/core/hle/service/filesystem/fsp/fsp_pr.h
index bd4e0a730..bd4e0a730 100644
--- a/src/core/hle/service/filesystem/fsp_pr.h
+++ b/src/core/hle/service/filesystem/fsp/fsp_pr.h
diff --git a/src/core/hle/service/filesystem/fsp_srv.cpp b/src/core/hle/service/filesystem/fsp/fsp_srv.cpp
index a2397bec4..2be72b021 100644
--- a/src/core/hle/service/filesystem/fsp_srv.cpp
+++ b/src/core/hle/service/filesystem/fsp/fsp_srv.cpp
@@ -15,18 +15,20 @@
 #include "common/settings.h"
 #include "common/string_util.h"
 #include "core/core.h"
-#include "core/file_sys/directory.h"
 #include "core/file_sys/errors.h"
-#include "core/file_sys/mode.h"
+#include "core/file_sys/fs_directory.h"
+#include "core/file_sys/fs_filesystem.h"
 #include "core/file_sys/nca_metadata.h"
 #include "core/file_sys/patch_manager.h"
 #include "core/file_sys/romfs_factory.h"
 #include "core/file_sys/savedata_factory.h"
 #include "core/file_sys/system_archive/system_archive.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/hle/result.h"
 #include "core/hle/service/filesystem/filesystem.h"
-#include "core/hle/service/filesystem/fsp_srv.h"
+#include "core/hle/service/filesystem/fsp/fs_i_filesystem.h"
+#include "core/hle/service/filesystem/fsp/fs_i_storage.h"
+#include "core/hle/service/filesystem/fsp/fsp_srv.h"
 #include "core/hle/service/filesystem/romfs_controller.h"
 #include "core/hle/service/filesystem/save_data_controller.h"
 #include "core/hle/service/hle_ipc.h"
@@ -34,19 +36,6 @@
 #include "core/reporter.h"
 
 namespace Service::FileSystem {
-
-struct SizeGetter {
-    std::function<u64()> get_free_size;
-    std::function<u64()> get_total_size;
-
-    static SizeGetter FromStorageId(const FileSystemController& fsc, FileSys::StorageId id) {
-        return {
-            [&fsc, id] { return fsc.GetFreeSpaceSize(id); },
-            [&fsc, id] { return fsc.GetTotalSpaceSize(id); },
-        };
-    }
-};
-
 enum class FileSystemType : u8 {
     Invalid0 = 0,
     Invalid1 = 1,
@@ -58,525 +47,6 @@ enum class FileSystemType : u8 {
     ApplicationPackage = 7,
 };
 
-class IStorage final : public ServiceFramework<IStorage> {
-public:
-    explicit IStorage(Core::System& system_, FileSys::VirtualFile backend_)
-        : ServiceFramework{system_, "IStorage"}, backend(std::move(backend_)) {
-        static const FunctionInfo functions[] = {
-            {0, &IStorage::Read, "Read"},
-            {1, nullptr, "Write"},
-            {2, nullptr, "Flush"},
-            {3, nullptr, "SetSize"},
-            {4, &IStorage::GetSize, "GetSize"},
-            {5, nullptr, "OperateRange"},
-        };
-        RegisterHandlers(functions);
-    }
-
-private:
-    FileSys::VirtualFile backend;
-
-    void Read(HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-        const s64 offset = rp.Pop<s64>();
-        const s64 length = rp.Pop<s64>();
-
-        LOG_DEBUG(Service_FS, "called, offset=0x{:X}, length={}", offset, length);
-
-        // Error checking
-        if (length < 0) {
-            LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(FileSys::ERROR_INVALID_SIZE);
-            return;
-        }
-        if (offset < 0) {
-            LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(FileSys::ERROR_INVALID_OFFSET);
-            return;
-        }
-
-        // Read the data from the Storage backend
-        std::vector<u8> output = backend->ReadBytes(length, offset);
-        // Write the data to memory
-        ctx.WriteBuffer(output);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(ResultSuccess);
-    }
-
-    void GetSize(HLERequestContext& ctx) {
-        const u64 size = backend->GetSize();
-        LOG_DEBUG(Service_FS, "called, size={}", size);
-
-        IPC::ResponseBuilder rb{ctx, 4};
-        rb.Push(ResultSuccess);
-        rb.Push<u64>(size);
-    }
-};
-
-class IFile final : public ServiceFramework<IFile> {
-public:
-    explicit IFile(Core::System& system_, FileSys::VirtualFile backend_)
-        : ServiceFramework{system_, "IFile"}, backend(std::move(backend_)) {
-        static const FunctionInfo functions[] = {
-            {0, &IFile::Read, "Read"},
-            {1, &IFile::Write, "Write"},
-            {2, &IFile::Flush, "Flush"},
-            {3, &IFile::SetSize, "SetSize"},
-            {4, &IFile::GetSize, "GetSize"},
-            {5, nullptr, "OperateRange"},
-            {6, nullptr, "OperateRangeWithBuffer"},
-        };
-        RegisterHandlers(functions);
-    }
-
-private:
-    FileSys::VirtualFile backend;
-
-    void Read(HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-        const u64 option = rp.Pop<u64>();
-        const s64 offset = rp.Pop<s64>();
-        const s64 length = rp.Pop<s64>();
-
-        LOG_DEBUG(Service_FS, "called, option={}, offset=0x{:X}, length={}", option, offset,
-                  length);
-
-        // Error checking
-        if (length < 0) {
-            LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(FileSys::ERROR_INVALID_SIZE);
-            return;
-        }
-        if (offset < 0) {
-            LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(FileSys::ERROR_INVALID_OFFSET);
-            return;
-        }
-
-        // Read the data from the Storage backend
-        std::vector<u8> output = backend->ReadBytes(length, offset);
-
-        // Write the data to memory
-        ctx.WriteBuffer(output);
-
-        IPC::ResponseBuilder rb{ctx, 4};
-        rb.Push(ResultSuccess);
-        rb.Push(static_cast<u64>(output.size()));
-    }
-
-    void Write(HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-        const u64 option = rp.Pop<u64>();
-        const s64 offset = rp.Pop<s64>();
-        const s64 length = rp.Pop<s64>();
-
-        LOG_DEBUG(Service_FS, "called, option={}, offset=0x{:X}, length={}", option, offset,
-                  length);
-
-        // Error checking
-        if (length < 0) {
-            LOG_ERROR(Service_FS, "Length is less than 0, length={}", length);
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(FileSys::ERROR_INVALID_SIZE);
-            return;
-        }
-        if (offset < 0) {
-            LOG_ERROR(Service_FS, "Offset is less than 0, offset={}", offset);
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(FileSys::ERROR_INVALID_OFFSET);
-            return;
-        }
-
-        const auto data = ctx.ReadBuffer();
-
-        ASSERT_MSG(
-            static_cast<s64>(data.size()) <= length,
-            "Attempting to write more data than requested (requested={:016X}, actual={:016X}).",
-            length, data.size());
-
-        // Write the data to the Storage backend
-        const auto write_size =
-            static_cast<std::size_t>(std::distance(data.begin(), data.begin() + length));
-        const std::size_t written = backend->Write(data.data(), write_size, offset);
-
-        ASSERT_MSG(static_cast<s64>(written) == length,
-                   "Could not write all bytes to file (requested={:016X}, actual={:016X}).", length,
-                   written);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(ResultSuccess);
-    }
-
-    void Flush(HLERequestContext& ctx) {
-        LOG_DEBUG(Service_FS, "called");
-
-        // Exists for SDK compatibiltity -- No need to flush file.
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(ResultSuccess);
-    }
-
-    void SetSize(HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-        const u64 size = rp.Pop<u64>();
-        LOG_DEBUG(Service_FS, "called, size={}", size);
-
-        backend->Resize(size);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(ResultSuccess);
-    }
-
-    void GetSize(HLERequestContext& ctx) {
-        const u64 size = backend->GetSize();
-        LOG_DEBUG(Service_FS, "called, size={}", size);
-
-        IPC::ResponseBuilder rb{ctx, 4};
-        rb.Push(ResultSuccess);
-        rb.Push<u64>(size);
-    }
-};
-
-template <typename T>
-static void BuildEntryIndex(std::vector<FileSys::Entry>& entries, const std::vector<T>& new_data,
-                            FileSys::EntryType type) {
-    entries.reserve(entries.size() + new_data.size());
-
-    for (const auto& new_entry : new_data) {
-        auto name = new_entry->GetName();
-
-        if (type == FileSys::EntryType::File && name == FileSys::GetSaveDataSizeFileName()) {
-            continue;
-        }
-
-        entries.emplace_back(name, type,
-                             type == FileSys::EntryType::Directory ? 0 : new_entry->GetSize());
-    }
-}
-
-class IDirectory final : public ServiceFramework<IDirectory> {
-public:
-    explicit IDirectory(Core::System& system_, FileSys::VirtualDir backend_, OpenDirectoryMode mode)
-        : ServiceFramework{system_, "IDirectory"}, backend(std::move(backend_)) {
-        static const FunctionInfo functions[] = {
-            {0, &IDirectory::Read, "Read"},
-            {1, &IDirectory::GetEntryCount, "GetEntryCount"},
-        };
-        RegisterHandlers(functions);
-
-        // TODO(DarkLordZach): Verify that this is the correct behavior.
-        // Build entry index now to save time later.
-        if (True(mode & OpenDirectoryMode::Directory)) {
-            BuildEntryIndex(entries, backend->GetSubdirectories(), FileSys::EntryType::Directory);
-        }
-        if (True(mode & OpenDirectoryMode::File)) {
-            BuildEntryIndex(entries, backend->GetFiles(), FileSys::EntryType::File);
-        }
-    }
-
-private:
-    FileSys::VirtualDir backend;
-    std::vector<FileSys::Entry> entries;
-    u64 next_entry_index = 0;
-
-    void Read(HLERequestContext& ctx) {
-        LOG_DEBUG(Service_FS, "called.");
-
-        // Calculate how many entries we can fit in the output buffer
-        const u64 count_entries = ctx.GetWriteBufferNumElements<FileSys::Entry>();
-
-        // Cap at total number of entries.
-        const u64 actual_entries = std::min(count_entries, entries.size() - next_entry_index);
-
-        // Determine data start and end
-        const auto* begin = reinterpret_cast<u8*>(entries.data() + next_entry_index);
-        const auto* end = reinterpret_cast<u8*>(entries.data() + next_entry_index + actual_entries);
-        const auto range_size = static_cast<std::size_t>(std::distance(begin, end));
-
-        next_entry_index += actual_entries;
-
-        // Write the data to memory
-        ctx.WriteBuffer(begin, range_size);
-
-        IPC::ResponseBuilder rb{ctx, 4};
-        rb.Push(ResultSuccess);
-        rb.Push(actual_entries);
-    }
-
-    void GetEntryCount(HLERequestContext& ctx) {
-        LOG_DEBUG(Service_FS, "called");
-
-        u64 count = entries.size() - next_entry_index;
-
-        IPC::ResponseBuilder rb{ctx, 4};
-        rb.Push(ResultSuccess);
-        rb.Push(count);
-    }
-};
-
-class IFileSystem final : public ServiceFramework<IFileSystem> {
-public:
-    explicit IFileSystem(Core::System& system_, FileSys::VirtualDir backend_, SizeGetter size_)
-        : ServiceFramework{system_, "IFileSystem"}, backend{std::move(backend_)}, size{std::move(
-                                                                                      size_)} {
-        static const FunctionInfo functions[] = {
-            {0, &IFileSystem::CreateFile, "CreateFile"},
-            {1, &IFileSystem::DeleteFile, "DeleteFile"},
-            {2, &IFileSystem::CreateDirectory, "CreateDirectory"},
-            {3, &IFileSystem::DeleteDirectory, "DeleteDirectory"},
-            {4, &IFileSystem::DeleteDirectoryRecursively, "DeleteDirectoryRecursively"},
-            {5, &IFileSystem::RenameFile, "RenameFile"},
-            {6, nullptr, "RenameDirectory"},
-            {7, &IFileSystem::GetEntryType, "GetEntryType"},
-            {8, &IFileSystem::OpenFile, "OpenFile"},
-            {9, &IFileSystem::OpenDirectory, "OpenDirectory"},
-            {10, &IFileSystem::Commit, "Commit"},
-            {11, &IFileSystem::GetFreeSpaceSize, "GetFreeSpaceSize"},
-            {12, &IFileSystem::GetTotalSpaceSize, "GetTotalSpaceSize"},
-            {13, &IFileSystem::CleanDirectoryRecursively, "CleanDirectoryRecursively"},
-            {14, &IFileSystem::GetFileTimeStampRaw, "GetFileTimeStampRaw"},
-            {15, nullptr, "QueryEntry"},
-            {16, &IFileSystem::GetFileSystemAttribute, "GetFileSystemAttribute"},
-        };
-        RegisterHandlers(functions);
-    }
-
-    void CreateFile(HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        const u64 file_mode = rp.Pop<u64>();
-        const u32 file_size = rp.Pop<u32>();
-
-        LOG_DEBUG(Service_FS, "called. file={}, mode=0x{:X}, size=0x{:08X}", name, file_mode,
-                  file_size);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(backend.CreateFile(name, file_size));
-    }
-
-    void DeleteFile(HLERequestContext& ctx) {
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        LOG_DEBUG(Service_FS, "called. file={}", name);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(backend.DeleteFile(name));
-    }
-
-    void CreateDirectory(HLERequestContext& ctx) {
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        LOG_DEBUG(Service_FS, "called. directory={}", name);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(backend.CreateDirectory(name));
-    }
-
-    void DeleteDirectory(HLERequestContext& ctx) {
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        LOG_DEBUG(Service_FS, "called. directory={}", name);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(backend.DeleteDirectory(name));
-    }
-
-    void DeleteDirectoryRecursively(HLERequestContext& ctx) {
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        LOG_DEBUG(Service_FS, "called. directory={}", name);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(backend.DeleteDirectoryRecursively(name));
-    }
-
-    void CleanDirectoryRecursively(HLERequestContext& ctx) {
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        LOG_DEBUG(Service_FS, "called. Directory: {}", name);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(backend.CleanDirectoryRecursively(name));
-    }
-
-    void RenameFile(HLERequestContext& ctx) {
-        const std::string src_name = Common::StringFromBuffer(ctx.ReadBuffer(0));
-        const std::string dst_name = Common::StringFromBuffer(ctx.ReadBuffer(1));
-
-        LOG_DEBUG(Service_FS, "called. file '{}' to file '{}'", src_name, dst_name);
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(backend.RenameFile(src_name, dst_name));
-    }
-
-    void OpenFile(HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        const auto mode = static_cast<FileSys::Mode>(rp.Pop<u32>());
-
-        LOG_DEBUG(Service_FS, "called. file={}, mode={}", name, mode);
-
-        FileSys::VirtualFile vfs_file{};
-        auto result = backend.OpenFile(&vfs_file, name, mode);
-        if (result != ResultSuccess) {
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(result);
-            return;
-        }
-
-        auto file = std::make_shared<IFile>(system, vfs_file);
-
-        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-        rb.Push(ResultSuccess);
-        rb.PushIpcInterface<IFile>(std::move(file));
-    }
-
-    void OpenDirectory(HLERequestContext& ctx) {
-        IPC::RequestParser rp{ctx};
-
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-        const auto mode = rp.PopRaw<OpenDirectoryMode>();
-
-        LOG_DEBUG(Service_FS, "called. directory={}, mode={}", name, mode);
-
-        FileSys::VirtualDir vfs_dir{};
-        auto result = backend.OpenDirectory(&vfs_dir, name);
-        if (result != ResultSuccess) {
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(result);
-            return;
-        }
-
-        auto directory = std::make_shared<IDirectory>(system, vfs_dir, mode);
-
-        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
-        rb.Push(ResultSuccess);
-        rb.PushIpcInterface<IDirectory>(std::move(directory));
-    }
-
-    void GetEntryType(HLERequestContext& ctx) {
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        LOG_DEBUG(Service_FS, "called. file={}", name);
-
-        FileSys::EntryType vfs_entry_type{};
-        auto result = backend.GetEntryType(&vfs_entry_type, name);
-        if (result != ResultSuccess) {
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(result);
-            return;
-        }
-
-        IPC::ResponseBuilder rb{ctx, 3};
-        rb.Push(ResultSuccess);
-        rb.Push<u32>(static_cast<u32>(vfs_entry_type));
-    }
-
-    void Commit(HLERequestContext& ctx) {
-        LOG_WARNING(Service_FS, "(STUBBED) called");
-
-        IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(ResultSuccess);
-    }
-
-    void GetFreeSpaceSize(HLERequestContext& ctx) {
-        LOG_DEBUG(Service_FS, "called");
-
-        IPC::ResponseBuilder rb{ctx, 4};
-        rb.Push(ResultSuccess);
-        rb.Push(size.get_free_size());
-    }
-
-    void GetTotalSpaceSize(HLERequestContext& ctx) {
-        LOG_DEBUG(Service_FS, "called");
-
-        IPC::ResponseBuilder rb{ctx, 4};
-        rb.Push(ResultSuccess);
-        rb.Push(size.get_total_size());
-    }
-
-    void GetFileTimeStampRaw(HLERequestContext& ctx) {
-        const auto file_buffer = ctx.ReadBuffer();
-        const std::string name = Common::StringFromBuffer(file_buffer);
-
-        LOG_WARNING(Service_FS, "(Partial Implementation) called. file={}", name);
-
-        FileSys::FileTimeStampRaw vfs_timestamp{};
-        auto result = backend.GetFileTimeStampRaw(&vfs_timestamp, name);
-        if (result != ResultSuccess) {
-            IPC::ResponseBuilder rb{ctx, 2};
-            rb.Push(result);
-            return;
-        }
-
-        IPC::ResponseBuilder rb{ctx, 10};
-        rb.Push(ResultSuccess);
-        rb.PushRaw(vfs_timestamp);
-    }
-
-    void GetFileSystemAttribute(HLERequestContext& ctx) {
-        LOG_WARNING(Service_FS, "(STUBBED) called");
-
-        struct FileSystemAttribute {
-            u8 dir_entry_name_length_max_defined;
-            u8 file_entry_name_length_max_defined;
-            u8 dir_path_name_length_max_defined;
-            u8 file_path_name_length_max_defined;
-            INSERT_PADDING_BYTES_NOINIT(0x5);
-            u8 utf16_dir_entry_name_length_max_defined;
-            u8 utf16_file_entry_name_length_max_defined;
-            u8 utf16_dir_path_name_length_max_defined;
-            u8 utf16_file_path_name_length_max_defined;
-            INSERT_PADDING_BYTES_NOINIT(0x18);
-            s32 dir_entry_name_length_max;
-            s32 file_entry_name_length_max;
-            s32 dir_path_name_length_max;
-            s32 file_path_name_length_max;
-            INSERT_PADDING_WORDS_NOINIT(0x5);
-            s32 utf16_dir_entry_name_length_max;
-            s32 utf16_file_entry_name_length_max;
-            s32 utf16_dir_path_name_length_max;
-            s32 utf16_file_path_name_length_max;
-            INSERT_PADDING_WORDS_NOINIT(0x18);
-            INSERT_PADDING_WORDS_NOINIT(0x1);
-        };
-        static_assert(sizeof(FileSystemAttribute) == 0xc0,
-                      "FileSystemAttribute has incorrect size");
-
-        FileSystemAttribute savedata_attribute{};
-        savedata_attribute.dir_entry_name_length_max_defined = true;
-        savedata_attribute.file_entry_name_length_max_defined = true;
-        savedata_attribute.dir_entry_name_length_max = 0x40;
-        savedata_attribute.file_entry_name_length_max = 0x40;
-
-        IPC::ResponseBuilder rb{ctx, 50};
-        rb.Push(ResultSuccess);
-        rb.PushRaw(savedata_attribute);
-    }
-
-private:
-    VfsDirectoryServiceWrapper backend;
-    SizeGetter size;
-};
-
 class ISaveDataInfoReader final : public ServiceFramework<ISaveDataInfoReader> {
 public:
     explicit ISaveDataInfoReader(Core::System& system_,
@@ -960,7 +430,7 @@ void FSP_SRV::OpenSaveDataFileSystem(HLERequestContext& ctx) {
         save_data_controller->OpenSaveData(&dir, parameters.space_id, parameters.attribute);
     if (result != ResultSuccess) {
         IPC::ResponseBuilder rb{ctx, 2, 0, 0};
-        rb.Push(FileSys::ERROR_ENTITY_NOT_FOUND);
+        rb.Push(FileSys::ResultTargetNotFound);
         return;
     }
 
@@ -1127,7 +597,7 @@ void FSP_SRV::OpenPatchDataStorageByCurrentProcess(HLERequestContext& ctx) {
     LOG_DEBUG(Service_FS, "called with storage_id={:02X}, title_id={:016X}", storage_id, title_id);
 
     IPC::ResponseBuilder rb{ctx, 2};
-    rb.Push(FileSys::ERROR_ENTITY_NOT_FOUND);
+    rb.Push(FileSys::ResultTargetNotFound);
 }
 
 void FSP_SRV::OpenDataStorageWithProgramIndex(HLERequestContext& ctx) {
diff --git a/src/core/hle/service/filesystem/fsp_srv.h b/src/core/hle/service/filesystem/fsp/fsp_srv.h
index 26980af99..26980af99 100644
--- a/src/core/hle/service/filesystem/fsp_srv.h
+++ b/src/core/hle/service/filesystem/fsp/fsp_srv.h
diff --git a/src/core/hle/service/filesystem/fsp/fsp_util.h b/src/core/hle/service/filesystem/fsp/fsp_util.h
new file mode 100644
index 000000000..253f866db
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fsp_util.h
@@ -0,0 +1,22 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/filesystem/filesystem.h"
+
+namespace Service::FileSystem {
+
+struct SizeGetter {
+    std::function<u64()> get_free_size;
+    std::function<u64()> get_total_size;
+
+    static SizeGetter FromStorageId(const FileSystemController& fsc, FileSys::StorageId id) {
+        return {
+            [&fsc, id] { return fsc.GetFreeSpaceSize(id); },
+            [&fsc, id] { return fsc.GetTotalSpaceSize(id); },
+        };
+    }
+};
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/romfs_controller.h b/src/core/hle/service/filesystem/romfs_controller.h
index 9a478f71d..3c3ead344 100644
--- a/src/core/hle/service/filesystem/romfs_controller.h
+++ b/src/core/hle/service/filesystem/romfs_controller.h
@@ -5,7 +5,7 @@
 
 #include "core/file_sys/nca_metadata.h"
 #include "core/file_sys/romfs_factory.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace Service::FileSystem {
 
diff --git a/src/core/hle/service/filesystem/save_data_controller.cpp b/src/core/hle/service/filesystem/save_data_controller.cpp
index d19b3ea1e..03e45f7f9 100644
--- a/src/core/hle/service/filesystem/save_data_controller.cpp
+++ b/src/core/hle/service/filesystem/save_data_controller.cpp
@@ -44,7 +44,7 @@ Result SaveDataController::CreateSaveData(FileSys::VirtualDir* out_save_data,
 
     auto save_data = factory->Create(space, attribute);
     if (save_data == nullptr) {
-        return FileSys::ERROR_ENTITY_NOT_FOUND;
+        return FileSys::ResultTargetNotFound;
     }
 
     *out_save_data = save_data;
@@ -56,7 +56,7 @@ Result SaveDataController::OpenSaveData(FileSys::VirtualDir* out_save_data,
                                         const FileSys::SaveDataAttribute& attribute) {
     auto save_data = factory->Open(space, attribute);
     if (save_data == nullptr) {
-        return FileSys::ERROR_ENTITY_NOT_FOUND;
+        return FileSys::ResultTargetNotFound;
     }
 
     *out_save_data = save_data;
@@ -67,7 +67,7 @@ Result SaveDataController::OpenSaveDataSpace(FileSys::VirtualDir* out_save_data_
                                              FileSys::SaveDataSpaceId space) {
     auto save_data_space = factory->GetSaveDataSpaceDirectory(space);
     if (save_data_space == nullptr) {
-        return FileSys::ERROR_ENTITY_NOT_FOUND;
+        return FileSys::ResultTargetNotFound;
     }
 
     *out_save_data_space = save_data_space;
diff --git a/src/core/hle/service/filesystem/save_data_controller.h b/src/core/hle/service/filesystem/save_data_controller.h
index 863188e4c..dc9d713df 100644
--- a/src/core/hle/service/filesystem/save_data_controller.h
+++ b/src/core/hle/service/filesystem/save_data_controller.h
@@ -5,7 +5,7 @@
 
 #include "core/file_sys/nca_metadata.h"
 #include "core/file_sys/savedata_factory.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace Service::FileSystem {
 
diff --git a/src/core/hle/service/glue/time/manager.cpp b/src/core/hle/service/glue/time/manager.cpp
index 6423e5089..b56762941 100644
--- a/src/core/hle/service/glue/time/manager.cpp
+++ b/src/core/hle/service/glue/time/manager.cpp
@@ -8,7 +8,7 @@
 
 #include "common/settings.h"
 #include "common/time_zone.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/hle/kernel/svc.h"
 #include "core/hle/service/glue/time/manager.h"
 #include "core/hle/service/glue/time/time_zone_binary.h"
diff --git a/src/core/hle/service/glue/time/manager.h b/src/core/hle/service/glue/time/manager.h
index a46ec6364..1de93f8f9 100644
--- a/src/core/hle/service/glue/time/manager.h
+++ b/src/core/hle/service/glue/time/manager.h
@@ -7,7 +7,7 @@
 #include <string>
 
 #include "common/common_types.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 #include "core/hle/service/glue/time/file_timestamp_worker.h"
 #include "core/hle/service/glue/time/standard_steady_clock_resource.h"
 #include "core/hle/service/glue/time/worker.h"
diff --git a/src/core/hle/service/glue/time/time_zone_binary.cpp b/src/core/hle/service/glue/time/time_zone_binary.cpp
index 67969aa3f..d33f784c0 100644
--- a/src/core/hle/service/glue/time/time_zone_binary.cpp
+++ b/src/core/hle/service/glue/time/time_zone_binary.cpp
@@ -7,7 +7,7 @@
 #include "core/file_sys/registered_cache.h"
 #include "core/file_sys/romfs.h"
 #include "core/file_sys/system_archive/system_archive.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/glue/time/time_zone_binary.h"
 
diff --git a/src/core/hle/service/nfc/nfc_interface.cpp b/src/core/hle/service/nfc/nfc_interface.cpp
index 207ac4efe..3e2c7deab 100644
--- a/src/core/hle/service/nfc/nfc_interface.cpp
+++ b/src/core/hle/service/nfc/nfc_interface.cpp
@@ -301,7 +301,7 @@ Result NfcInterface::TranslateResultToServiceError(Result result) const {
         return result;
     }
 
-    if (result.module != ErrorModule::NFC) {
+    if (result.GetModule() != ErrorModule::NFC) {
         return result;
     }
 
diff --git a/src/core/hle/service/ns/ns.cpp b/src/core/hle/service/ns/ns.cpp
index a25b79513..2258ee609 100644
--- a/src/core/hle/service/ns/ns.cpp
+++ b/src/core/hle/service/ns/ns.cpp
@@ -6,7 +6,7 @@
 #include "core/core.h"
 #include "core/file_sys/control_metadata.h"
 #include "core/file_sys/patch_manager.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/glue/glue_manager.h"
 #include "core/hle/service/ipc_helpers.h"
diff --git a/src/core/hle/service/set/system_settings_server.cpp b/src/core/hle/service/set/system_settings_server.cpp
index f40a1c8f3..b527c39a9 100644
--- a/src/core/hle/service/set/system_settings_server.cpp
+++ b/src/core/hle/service/set/system_settings_server.cpp
@@ -67,13 +67,13 @@ Result GetFirmwareVersionImpl(FirmwareVersionFormat& out_firmware, Core::System&
     const auto ver_file = romfs->GetFile("file");
     if (ver_file == nullptr) {
         return early_exit_failure("The system version archive didn't contain the file 'file'.",
-                                  FileSys::ERROR_INVALID_ARGUMENT);
+                                  FileSys::ResultInvalidArgument);
     }
 
     auto data = ver_file->ReadAllBytes();
     if (data.size() != sizeof(FirmwareVersionFormat)) {
         return early_exit_failure("The system version file 'file' was not the correct size.",
-                                  FileSys::ERROR_OUT_OF_BOUNDS);
+                                  FileSys::ResultOutOfRange);
     }
 
     std::memcpy(&out_firmware, data.data(), sizeof(FirmwareVersionFormat));