9 files changed, 91 insertions, 80 deletions

diff --git a/src/core/file_sys/romfs_factory.cpp b/src/core/file_sys/romfs_factory.cpp
index c3ee4a158..84cd4684c 100644
--- a/src/core/file_sys/romfs_factory.cpp
+++ b/src/core/file_sys/romfs_factory.cpp
@@ -35,7 +35,7 @@ void RomFSFactory::SetPackedUpdate(VirtualFile update_raw) {
     this->update_raw = std::move(update_raw);
 }
 
-ResultVal<VirtualFile> RomFSFactory::OpenCurrentProcess() {
+ResultVal<VirtualFile> RomFSFactory::OpenCurrentProcess() const {
     if (!updatable)
         return MakeResult<VirtualFile>(file);
 
@@ -44,7 +44,8 @@ ResultVal<VirtualFile> RomFSFactory::OpenCurrentProcess() {
         patch_manager.PatchRomFS(file, ivfc_offset, ContentRecordType::Program, update_raw));
 }
 
-ResultVal<VirtualFile> RomFSFactory::Open(u64 title_id, StorageId storage, ContentRecordType type) {
+ResultVal<VirtualFile> RomFSFactory::Open(u64 title_id, StorageId storage,
+                                          ContentRecordType type) const {
     std::shared_ptr<NCA> res;
 
     switch (storage) {
diff --git a/src/core/file_sys/romfs_factory.h b/src/core/file_sys/romfs_factory.h
index 7724c0b23..da63a313a 100644
--- a/src/core/file_sys/romfs_factory.h
+++ b/src/core/file_sys/romfs_factory.h
@@ -33,8 +33,8 @@ public:
     ~RomFSFactory();
 
     void SetPackedUpdate(VirtualFile update_raw);
-    ResultVal<VirtualFile> OpenCurrentProcess();
-    ResultVal<VirtualFile> Open(u64 title_id, StorageId storage, ContentRecordType type);
+    ResultVal<VirtualFile> OpenCurrentProcess() const;
+    ResultVal<VirtualFile> Open(u64 title_id, StorageId storage, ContentRecordType type) const;
 
 private:
     VirtualFile file;
diff --git a/src/core/file_sys/savedata_factory.cpp b/src/core/file_sys/savedata_factory.cpp
index c63815332..f77cc02ac 100644
--- a/src/core/file_sys/savedata_factory.cpp
+++ b/src/core/file_sys/savedata_factory.cpp
@@ -71,7 +71,7 @@ SaveDataFactory::SaveDataFactory(VirtualDir save_directory) : dir(std::move(save
 SaveDataFactory::~SaveDataFactory() = default;
 
 ResultVal<VirtualDir> SaveDataFactory::Create(SaveDataSpaceId space,
-                                              const SaveDataDescriptor& meta) {
+                                              const SaveDataDescriptor& meta) const {
     PrintSaveDataDescriptorWarnings(meta);
 
     const auto save_directory =
@@ -88,7 +88,8 @@ ResultVal<VirtualDir> SaveDataFactory::Create(SaveDataSpaceId space,
     return MakeResult<VirtualDir>(std::move(out));
 }
 
-ResultVal<VirtualDir> SaveDataFactory::Open(SaveDataSpaceId space, const SaveDataDescriptor& meta) {
+ResultVal<VirtualDir> SaveDataFactory::Open(SaveDataSpaceId space,
+                                            const SaveDataDescriptor& meta) const {
 
     const auto save_directory =
         GetFullPath(space, meta.type, meta.title_id, meta.user_id, meta.save_id);
@@ -165,7 +166,7 @@ SaveDataSize SaveDataFactory::ReadSaveDataSize(SaveDataType type, u64 title_id,
 }
 
 void SaveDataFactory::WriteSaveDataSize(SaveDataType type, u64 title_id, u128 user_id,
-                                        SaveDataSize new_value) {
+                                        SaveDataSize new_value) const {
     const auto path = GetFullPath(SaveDataSpaceId::NandUser, type, title_id, user_id, 0);
     const auto dir = GetOrCreateDirectoryRelative(this->dir, path);
 
diff --git a/src/core/file_sys/savedata_factory.h b/src/core/file_sys/savedata_factory.h
index 738038ee0..991e57aa1 100644
--- a/src/core/file_sys/savedata_factory.h
+++ b/src/core/file_sys/savedata_factory.h
@@ -64,8 +64,8 @@ public:
     explicit SaveDataFactory(VirtualDir dir);
     ~SaveDataFactory();
 
-    ResultVal<VirtualDir> Create(SaveDataSpaceId space, const SaveDataDescriptor& meta);
-    ResultVal<VirtualDir> Open(SaveDataSpaceId space, const SaveDataDescriptor& meta);
+    ResultVal<VirtualDir> Create(SaveDataSpaceId space, const SaveDataDescriptor& meta) const;
+    ResultVal<VirtualDir> Open(SaveDataSpaceId space, const SaveDataDescriptor& meta) const;
 
     VirtualDir GetSaveDataSpaceDirectory(SaveDataSpaceId space) const;
 
@@ -74,7 +74,8 @@ public:
                                    u128 user_id, u64 save_id);
 
     SaveDataSize ReadSaveDataSize(SaveDataType type, u64 title_id, u128 user_id) const;
-    void WriteSaveDataSize(SaveDataType type, u64 title_id, u128 user_id, SaveDataSize new_value);
+    void WriteSaveDataSize(SaveDataType type, u64 title_id, u128 user_id,
+                           SaveDataSize new_value) const;
 
 private:
     VirtualDir dir;
diff --git a/src/core/file_sys/sdmc_factory.cpp b/src/core/file_sys/sdmc_factory.cpp
index 743e2e63a..5113a1ca6 100644
--- a/src/core/file_sys/sdmc_factory.cpp
+++ b/src/core/file_sys/sdmc_factory.cpp
@@ -21,7 +21,7 @@ SDMCFactory::SDMCFactory(VirtualDir dir_)
 
 SDMCFactory::~SDMCFactory() = default;
 
-ResultVal<VirtualDir> SDMCFactory::Open() {
+ResultVal<VirtualDir> SDMCFactory::Open() const {
     return MakeResult<VirtualDir>(dir);
 }
 
diff --git a/src/core/file_sys/sdmc_factory.h b/src/core/file_sys/sdmc_factory.h
index 164fd9435..42dc4e08a 100644
--- a/src/core/file_sys/sdmc_factory.h
+++ b/src/core/file_sys/sdmc_factory.h
@@ -19,7 +19,7 @@ public:
     explicit SDMCFactory(VirtualDir dir);
     ~SDMCFactory();
 
-    ResultVal<VirtualDir> Open();
+    ResultVal<VirtualDir> Open() const;
 
     VirtualDir GetSDMCContentDirectory() const;
 
diff --git a/src/core/hle/service/filesystem/filesystem.cpp b/src/core/hle/service/filesystem/filesystem.cpp
index 76a860c6d..31d5fd79b 100644
--- a/src/core/hle/service/filesystem/filesystem.cpp
+++ b/src/core/hle/service/filesystem/filesystem.cpp
@@ -241,6 +241,10 @@ ResultVal<FileSys::EntryType> VfsDirectoryServiceWrapper::GetEntryType(
     return FileSys::ERROR_PATH_NOT_FOUND;
 }
 
+FileSystemController::FileSystemController() = default;
+
+FileSystemController::~FileSystemController() = default;
+
 ResultCode FileSystemController::RegisterRomFS(std::unique_ptr<FileSys::RomFSFactory>&& factory) {
     romfs_factory = std::move(factory);
     LOG_DEBUG(Service_FS, "Registered RomFS");
@@ -278,7 +282,7 @@ void FileSystemController::SetPackedUpdate(FileSys::VirtualFile update_raw) {
     romfs_factory->SetPackedUpdate(std::move(update_raw));
 }
 
-ResultVal<FileSys::VirtualFile> FileSystemController::OpenRomFSCurrentProcess() {
+ResultVal<FileSys::VirtualFile> FileSystemController::OpenRomFSCurrentProcess() const {
     LOG_TRACE(Service_FS, "Opening RomFS for current process");
 
     if (romfs_factory == nullptr) {
@@ -289,9 +293,8 @@ ResultVal<FileSys::VirtualFile> FileSystemController::OpenRomFSCurrentProcess()
     return romfs_factory->OpenCurrentProcess();
 }
 
-ResultVal<FileSys::VirtualFile> FileSystemController::OpenRomFS(u64 title_id,
-                                                                FileSys::StorageId storage_id,
-                                                                FileSys::ContentRecordType type) {
+ResultVal<FileSys::VirtualFile> FileSystemController::OpenRomFS(
+    u64 title_id, FileSys::StorageId storage_id, FileSys::ContentRecordType type) const {
     LOG_TRACE(Service_FS, "Opening RomFS for title_id={:016X}, storage_id={:02X}, type={:02X}",
               title_id, static_cast<u8>(storage_id), static_cast<u8>(type));
 
@@ -304,7 +307,7 @@ ResultVal<FileSys::VirtualFile> FileSystemController::OpenRomFS(u64 title_id,
 }
 
 ResultVal<FileSys::VirtualDir> FileSystemController::CreateSaveData(
-    FileSys::SaveDataSpaceId space, const FileSys::SaveDataDescriptor& save_struct) {
+    FileSys::SaveDataSpaceId space, const FileSys::SaveDataDescriptor& save_struct) const {
     LOG_TRACE(Service_FS, "Creating Save Data for space_id={:01X}, save_struct={}",
               static_cast<u8>(space), save_struct.DebugInfo());
 
@@ -316,7 +319,7 @@ ResultVal<FileSys::VirtualDir> FileSystemController::CreateSaveData(
 }
 
 ResultVal<FileSys::VirtualDir> FileSystemController::OpenSaveData(
-    FileSys::SaveDataSpaceId space, const FileSys::SaveDataDescriptor& descriptor) {
+    FileSys::SaveDataSpaceId space, const FileSys::SaveDataDescriptor& descriptor) const {
     LOG_TRACE(Service_FS, "Opening Save Data for space_id={:01X}, save_struct={}",
               static_cast<u8>(space), descriptor.DebugInfo());
 
@@ -328,7 +331,7 @@ ResultVal<FileSys::VirtualDir> FileSystemController::OpenSaveData(
 }
 
 ResultVal<FileSys::VirtualDir> FileSystemController::OpenSaveDataSpace(
-    FileSys::SaveDataSpaceId space) {
+    FileSys::SaveDataSpaceId space) const {
     LOG_TRACE(Service_FS, "Opening Save Data Space for space_id={:01X}", static_cast<u8>(space));
 
     if (save_data_factory == nullptr) {
@@ -338,7 +341,7 @@ ResultVal<FileSys::VirtualDir> FileSystemController::OpenSaveDataSpace(
     return MakeResult(save_data_factory->GetSaveDataSpaceDirectory(space));
 }
 
-ResultVal<FileSys::VirtualDir> FileSystemController::OpenSDMC() {
+ResultVal<FileSys::VirtualDir> FileSystemController::OpenSDMC() const {
     LOG_TRACE(Service_FS, "Opening SDMC");
 
     if (sdmc_factory == nullptr) {
@@ -348,7 +351,8 @@ ResultVal<FileSys::VirtualDir> FileSystemController::OpenSDMC() {
     return sdmc_factory->Open();
 }
 
-ResultVal<FileSys::VirtualDir> FileSystemController::OpenBISPartition(FileSys::BisPartitionId id) {
+ResultVal<FileSys::VirtualDir> FileSystemController::OpenBISPartition(
+    FileSys::BisPartitionId id) const {
     LOG_TRACE(Service_FS, "Opening BIS Partition with id={:08X}", static_cast<u32>(id));
 
     if (bis_factory == nullptr) {
@@ -364,7 +368,7 @@ ResultVal<FileSys::VirtualDir> FileSystemController::OpenBISPartition(FileSys::B
 }
 
 ResultVal<FileSys::VirtualFile> FileSystemController::OpenBISPartitionStorage(
-    FileSys::BisPartitionId id) {
+    FileSys::BisPartitionId id) const {
     LOG_TRACE(Service_FS, "Opening BIS Partition Storage with id={:08X}", static_cast<u32>(id));
 
     if (bis_factory == nullptr) {
@@ -432,7 +436,7 @@ u64 FileSystemController::GetTotalSpaceSize(FileSys::StorageId id) const {
 }
 
 FileSys::SaveDataSize FileSystemController::ReadSaveDataSize(FileSys::SaveDataType type,
-                                                             u64 title_id, u128 user_id) {
+                                                             u64 title_id, u128 user_id) const {
     if (save_data_factory == nullptr) {
         return {0, 0};
     }
@@ -465,7 +469,7 @@ FileSys::SaveDataSize FileSystemController::ReadSaveDataSize(FileSys::SaveDataTy
 }
 
 void FileSystemController::WriteSaveDataSize(FileSys::SaveDataType type, u64 title_id, u128 user_id,
-                                             FileSys::SaveDataSize new_value) {
+                                             FileSys::SaveDataSize new_value) const {
     if (save_data_factory != nullptr)
         save_data_factory->WriteSaveDataSize(type, title_id, user_id, new_value);
 }
@@ -477,19 +481,19 @@ void FileSystemController::SetGameCard(FileSys::VirtualFile file) {
     gamecard_placeholder = std::make_unique<FileSys::PlaceholderCache>(dir);
 }
 
-FileSys::XCI* FileSystemController::GetGameCard() {
+FileSys::XCI* FileSystemController::GetGameCard() const {
     return gamecard.get();
 }
 
-FileSys::RegisteredCache* FileSystemController::GetGameCardContents() {
+FileSys::RegisteredCache* FileSystemController::GetGameCardContents() const {
     return gamecard_registered.get();
 }
 
-FileSys::PlaceholderCache* FileSystemController::GetGameCardPlaceholder() {
+FileSys::PlaceholderCache* FileSystemController::GetGameCardPlaceholder() const {
     return gamecard_placeholder.get();
 }
 
-FileSys::RegisteredCache* FileSystemController::GetSystemNANDContents() {
+FileSys::RegisteredCache* FileSystemController::GetSystemNANDContents() const {
     LOG_TRACE(Service_FS, "Opening System NAND Contents");
 
     if (bis_factory == nullptr)
@@ -498,7 +502,7 @@ FileSys::RegisteredCache* FileSystemController::GetSystemNANDContents() {
     return bis_factory->GetSystemNANDContents();
 }
 
-FileSys::RegisteredCache* FileSystemController::GetUserNANDContents() {
+FileSys::RegisteredCache* FileSystemController::GetUserNANDContents() const {
     LOG_TRACE(Service_FS, "Opening User NAND Contents");
 
     if (bis_factory == nullptr)
@@ -507,7 +511,7 @@ FileSys::RegisteredCache* FileSystemController::GetUserNANDContents() {
     return bis_factory->GetUserNANDContents();
 }
 
-FileSys::RegisteredCache* FileSystemController::GetSDMCContents() {
+FileSys::RegisteredCache* FileSystemController::GetSDMCContents() const {
     LOG_TRACE(Service_FS, "Opening SDMC Contents");
 
     if (sdmc_factory == nullptr)
@@ -516,7 +520,7 @@ FileSys::RegisteredCache* FileSystemController::GetSDMCContents() {
     return sdmc_factory->GetSDMCContents();
 }
 
-FileSys::PlaceholderCache* FileSystemController::GetSystemNANDPlaceholder() {
+FileSys::PlaceholderCache* FileSystemController::GetSystemNANDPlaceholder() const {
     LOG_TRACE(Service_FS, "Opening System NAND Placeholder");
 
     if (bis_factory == nullptr)
@@ -525,7 +529,7 @@ FileSys::PlaceholderCache* FileSystemController::GetSystemNANDPlaceholder() {
     return bis_factory->GetSystemNANDPlaceholder();
 }
 
-FileSys::PlaceholderCache* FileSystemController::GetUserNANDPlaceholder() {
+FileSys::PlaceholderCache* FileSystemController::GetUserNANDPlaceholder() const {
     LOG_TRACE(Service_FS, "Opening User NAND Placeholder");
 
     if (bis_factory == nullptr)
@@ -534,7 +538,7 @@ FileSys::PlaceholderCache* FileSystemController::GetUserNANDPlaceholder() {
     return bis_factory->GetUserNANDPlaceholder();
 }
 
-FileSys::PlaceholderCache* FileSystemController::GetSDMCPlaceholder() {
+FileSys::PlaceholderCache* FileSystemController::GetSDMCPlaceholder() const {
     LOG_TRACE(Service_FS, "Opening SDMC Placeholder");
 
     if (sdmc_factory == nullptr)
@@ -544,7 +548,7 @@ FileSys::PlaceholderCache* FileSystemController::GetSDMCPlaceholder() {
 }
 
 FileSys::RegisteredCache* FileSystemController::GetRegisteredCacheForStorage(
-    FileSys::StorageId id) {
+    FileSys::StorageId id) const {
     switch (id) {
     case FileSys::StorageId::None:
     case FileSys::StorageId::Host:
@@ -564,7 +568,7 @@ FileSys::RegisteredCache* FileSystemController::GetRegisteredCacheForStorage(
 }
 
 FileSys::PlaceholderCache* FileSystemController::GetPlaceholderCacheForStorage(
-    FileSys::StorageId id) {
+    FileSys::StorageId id) const {
     switch (id) {
     case FileSys::StorageId::None:
     case FileSys::StorageId::Host:
@@ -583,7 +587,7 @@ FileSys::PlaceholderCache* FileSystemController::GetPlaceholderCacheForStorage(
     return nullptr;
 }
 
-FileSys::VirtualDir FileSystemController::GetSystemNANDContentDirectory() {
+FileSys::VirtualDir FileSystemController::GetSystemNANDContentDirectory() const {
     LOG_TRACE(Service_FS, "Opening system NAND content directory");
 
     if (bis_factory == nullptr)
@@ -592,7 +596,7 @@ FileSys::VirtualDir FileSystemController::GetSystemNANDContentDirectory() {
     return bis_factory->GetSystemNANDContentDirectory();
 }
 
-FileSys::VirtualDir FileSystemController::GetUserNANDContentDirectory() {
+FileSys::VirtualDir FileSystemController::GetUserNANDContentDirectory() const {
     LOG_TRACE(Service_FS, "Opening user NAND content directory");
 
     if (bis_factory == nullptr)
@@ -601,7 +605,7 @@ FileSys::VirtualDir FileSystemController::GetUserNANDContentDirectory() {
     return bis_factory->GetUserNANDContentDirectory();
 }
 
-FileSys::VirtualDir FileSystemController::GetSDMCContentDirectory() {
+FileSys::VirtualDir FileSystemController::GetSDMCContentDirectory() const {
     LOG_TRACE(Service_FS, "Opening SDMC content directory");
 
     if (sdmc_factory == nullptr)
@@ -610,7 +614,7 @@ FileSys::VirtualDir FileSystemController::GetSDMCContentDirectory() {
     return sdmc_factory->GetSDMCContentDirectory();
 }
 
-FileSys::VirtualDir FileSystemController::GetNANDImageDirectory() {
+FileSys::VirtualDir FileSystemController::GetNANDImageDirectory() const {
     LOG_TRACE(Service_FS, "Opening NAND image directory");
 
     if (bis_factory == nullptr)
@@ -619,7 +623,7 @@ FileSys::VirtualDir FileSystemController::GetNANDImageDirectory() {
     return bis_factory->GetImageDirectory();
 }
 
-FileSys::VirtualDir FileSystemController::GetSDMCImageDirectory() {
+FileSys::VirtualDir FileSystemController::GetSDMCImageDirectory() const {
     LOG_TRACE(Service_FS, "Opening SDMC image directory");
 
     if (sdmc_factory == nullptr)
@@ -628,7 +632,7 @@ FileSys::VirtualDir FileSystemController::GetSDMCImageDirectory() {
     return sdmc_factory->GetImageDirectory();
 }
 
-FileSys::VirtualDir FileSystemController::GetContentDirectory(ContentStorageId id) {
+FileSys::VirtualDir FileSystemController::GetContentDirectory(ContentStorageId id) const {
     switch (id) {
     case ContentStorageId::System:
         return GetSystemNANDContentDirectory();
@@ -641,7 +645,7 @@ FileSys::VirtualDir FileSystemController::GetContentDirectory(ContentStorageId i
     return nullptr;
 }
 
-FileSys::VirtualDir FileSystemController::GetImageDirectory(ImageDirectoryId id) {
+FileSys::VirtualDir FileSystemController::GetImageDirectory(ImageDirectoryId id) const {
     switch (id) {
     case ImageDirectoryId::NAND:
         return GetNANDImageDirectory();
@@ -652,7 +656,7 @@ FileSys::VirtualDir FileSystemController::GetImageDirectory(ImageDirectoryId id)
     return nullptr;
 }
 
-FileSys::VirtualDir FileSystemController::GetModificationLoadRoot(u64 title_id) {
+FileSys::VirtualDir FileSystemController::GetModificationLoadRoot(u64 title_id) const {
     LOG_TRACE(Service_FS, "Opening mod load root for tid={:016X}", title_id);
 
     if (bis_factory == nullptr)
@@ -661,7 +665,7 @@ FileSys::VirtualDir FileSystemController::GetModificationLoadRoot(u64 title_id)
     return bis_factory->GetModificationLoadRoot(title_id);
 }
 
-FileSys::VirtualDir FileSystemController::GetModificationDumpRoot(u64 title_id) {
+FileSys::VirtualDir FileSystemController::GetModificationDumpRoot(u64 title_id) const {
     LOG_TRACE(Service_FS, "Opening mod dump root for tid={:016X}", title_id);
 
     if (bis_factory == nullptr)
diff --git a/src/core/hle/service/filesystem/filesystem.h b/src/core/hle/service/filesystem/filesystem.h
index 2eb3a641d..4d7da3b6f 100644
--- a/src/core/hle/service/filesystem/filesystem.h
+++ b/src/core/hle/service/filesystem/filesystem.h
@@ -52,59 +52,63 @@ enum class ImageDirectoryId : u32 {
 
 class FileSystemController {
 public:
+    FileSystemController();
+    ~FileSystemController();
+
     ResultCode RegisterRomFS(std::unique_ptr<FileSys::RomFSFactory>&& factory);
     ResultCode RegisterSaveData(std::unique_ptr<FileSys::SaveDataFactory>&& factory);
     ResultCode RegisterSDMC(std::unique_ptr<FileSys::SDMCFactory>&& factory);
     ResultCode RegisterBIS(std::unique_ptr<FileSys::BISFactory>&& factory);
 
     void SetPackedUpdate(FileSys::VirtualFile update_raw);
-    ResultVal<FileSys::VirtualFile> OpenRomFSCurrentProcess();
+    ResultVal<FileSys::VirtualFile> OpenRomFSCurrentProcess() const;
     ResultVal<FileSys::VirtualFile> OpenRomFS(u64 title_id, FileSys::StorageId storage_id,
-                                              FileSys::ContentRecordType type);
-    ResultVal<FileSys::VirtualDir> CreateSaveData(FileSys::SaveDataSpaceId space,
-                                                  const FileSys::SaveDataDescriptor& save_struct);
-    ResultVal<FileSys::VirtualDir> OpenSaveData(FileSys::SaveDataSpaceId space,
-                                                const FileSys::SaveDataDescriptor& save_struct);
-    ResultVal<FileSys::VirtualDir> OpenSaveDataSpace(FileSys::SaveDataSpaceId space);
-    ResultVal<FileSys::VirtualDir> OpenSDMC();
-    ResultVal<FileSys::VirtualDir> OpenBISPartition(FileSys::BisPartitionId id);
-    ResultVal<FileSys::VirtualFile> OpenBISPartitionStorage(FileSys::BisPartitionId id);
+                                              FileSys::ContentRecordType type) const;
+    ResultVal<FileSys::VirtualDir> CreateSaveData(
+        FileSys::SaveDataSpaceId space, const FileSys::SaveDataDescriptor& save_struct) const;
+    ResultVal<FileSys::VirtualDir> OpenSaveData(
+        FileSys::SaveDataSpaceId space, const FileSys::SaveDataDescriptor& save_struct) const;
+    ResultVal<FileSys::VirtualDir> OpenSaveDataSpace(FileSys::SaveDataSpaceId space) const;
+    ResultVal<FileSys::VirtualDir> OpenSDMC() const;
+    ResultVal<FileSys::VirtualDir> OpenBISPartition(FileSys::BisPartitionId id) const;
+    ResultVal<FileSys::VirtualFile> OpenBISPartitionStorage(FileSys::BisPartitionId id) const;
 
     u64 GetFreeSpaceSize(FileSys::StorageId id) const;
     u64 GetTotalSpaceSize(FileSys::StorageId id) const;
 
-    FileSys::SaveDataSize ReadSaveDataSize(FileSys::SaveDataType type, u64 title_id, u128 user_id);
+    FileSys::SaveDataSize ReadSaveDataSize(FileSys::SaveDataType type, u64 title_id,
+                                           u128 user_id) const;
     void WriteSaveDataSize(FileSys::SaveDataType type, u64 title_id, u128 user_id,
-                           FileSys::SaveDataSize new_value);
+                           FileSys::SaveDataSize new_value) const;
 
     void SetGameCard(FileSys::VirtualFile file);
-    FileSys::XCI* GetGameCard();
+    FileSys::XCI* GetGameCard() const;
 
-    FileSys::RegisteredCache* GetSystemNANDContents();
-    FileSys::RegisteredCache* GetUserNANDContents();
-    FileSys::RegisteredCache* GetSDMCContents();
-    FileSys::RegisteredCache* GetGameCardContents();
+    FileSys::RegisteredCache* GetSystemNANDContents() const;
+    FileSys::RegisteredCache* GetUserNANDContents() const;
+    FileSys::RegisteredCache* GetSDMCContents() const;
+    FileSys::RegisteredCache* GetGameCardContents() const;
 
-    FileSys::PlaceholderCache* GetSystemNANDPlaceholder();
-    FileSys::PlaceholderCache* GetUserNANDPlaceholder();
-    FileSys::PlaceholderCache* GetSDMCPlaceholder();
-    FileSys::PlaceholderCache* GetGameCardPlaceholder();
+    FileSys::PlaceholderCache* GetSystemNANDPlaceholder() const;
+    FileSys::PlaceholderCache* GetUserNANDPlaceholder() const;
+    FileSys::PlaceholderCache* GetSDMCPlaceholder() const;
+    FileSys::PlaceholderCache* GetGameCardPlaceholder() const;
 
-    FileSys::RegisteredCache* GetRegisteredCacheForStorage(FileSys::StorageId id);
-    FileSys::PlaceholderCache* GetPlaceholderCacheForStorage(FileSys::StorageId id);
+    FileSys::RegisteredCache* GetRegisteredCacheForStorage(FileSys::StorageId id) const;
+    FileSys::PlaceholderCache* GetPlaceholderCacheForStorage(FileSys::StorageId id) const;
 
-    FileSys::VirtualDir GetSystemNANDContentDirectory();
-    FileSys::VirtualDir GetUserNANDContentDirectory();
-    FileSys::VirtualDir GetSDMCContentDirectory();
+    FileSys::VirtualDir GetSystemNANDContentDirectory() const;
+    FileSys::VirtualDir GetUserNANDContentDirectory() const;
+    FileSys::VirtualDir GetSDMCContentDirectory() const;
 
-    FileSys::VirtualDir GetNANDImageDirectory();
-    FileSys::VirtualDir GetSDMCImageDirectory();
+    FileSys::VirtualDir GetNANDImageDirectory() const;
+    FileSys::VirtualDir GetSDMCImageDirectory() const;
 
-    FileSys::VirtualDir GetContentDirectory(ContentStorageId id);
-    FileSys::VirtualDir GetImageDirectory(ImageDirectoryId id);
+    FileSys::VirtualDir GetContentDirectory(ContentStorageId id) const;
+    FileSys::VirtualDir GetImageDirectory(ImageDirectoryId id) const;
 
-    FileSys::VirtualDir GetModificationLoadRoot(u64 title_id);
-    FileSys::VirtualDir GetModificationDumpRoot(u64 title_id);
+    FileSys::VirtualDir GetModificationLoadRoot(u64 title_id) const;
+    FileSys::VirtualDir GetModificationDumpRoot(u64 title_id) const;
 
     // Creates the SaveData, SDMC, and BIS Factories. Should be called once and before any function
     // above is called.
diff --git a/src/core/hle/service/filesystem/fsp_srv.cpp b/src/core/hle/service/filesystem/fsp_srv.cpp
index 525fda19f..305d9e176 100644
--- a/src/core/hle/service/filesystem/fsp_srv.cpp
+++ b/src/core/hle/service/filesystem/fsp_srv.cpp
@@ -32,8 +32,8 @@
 namespace Service::FileSystem {
 
 struct SizeGetter {
-    std::function<u64()> free;
-    std::function<u64()> total;
+    std::function<u64()> get_free_size;
+    std::function<u64()> get_total_size;
 
     static SizeGetter FromStorageId(const FileSystemController& fsc, FileSys::StorageId id) {
         return {
@@ -485,7 +485,7 @@ public:
 
         IPC::ResponseBuilder rb{ctx, 4};
         rb.Push(RESULT_SUCCESS);
-        rb.Push(size.free());
+        rb.Push(size.get_free_size());
     }
 
     void GetTotalSpaceSize(Kernel::HLERequestContext& ctx) {
@@ -493,7 +493,7 @@ public:
 
         IPC::ResponseBuilder rb{ctx, 4};
         rb.Push(RESULT_SUCCESS);
-        rb.Push(size.total());
+        rb.Push(size.get_total_size());
     }
 
 private: