early-access version 1255

src/core/hle/service/filesystem/filesystem.cpp

@@ -0,0 +1,762 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <utility>
+
+#include "common/assert.h"
+#include "common/file_util.h"
+#include "core/core.h"
+#include "core/file_sys/bis_factory.h"
+#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/partition_filesystem.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/hle/kernel/process.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/loader/loader.h"
+#include "core/settings.h"
+
+namespace Service::FileSystem {
+
+// A default size for normal/journal save data size if application control metadata cannot be found.
+// This should be large enough to satisfy even the most extreme requirements (~4.2GB)
+constexpr u64 SUFFICIENT_SAVE_DATA_SIZE = 0xF0000000;
+
+static FileSys::VirtualDir GetDirectoryRelativeWrapped(FileSys::VirtualDir base,
+                                                       std::string_view dir_name_) {
+    std::string dir_name(Common::FS::SanitizePath(dir_name_));
+    if (dir_name.empty() || dir_name == "." || dir_name == "/" || dir_name == "\\")
+        return base;
+
+    return base->GetDirectoryRelative(dir_name);
+}
+
+VfsDirectoryServiceWrapper::VfsDirectoryServiceWrapper(FileSys::VirtualDir backing_)
+    : backing(std::move(backing_)) {}
+
+VfsDirectoryServiceWrapper::~VfsDirectoryServiceWrapper() = default;
+
+std::string VfsDirectoryServiceWrapper::GetName() const {
+    return backing->GetName();
+}
+
+ResultCode VfsDirectoryServiceWrapper::CreateFile(const std::string& path_, u64 size) const {
+    std::string path(Common::FS::SanitizePath(path_));
+    auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
+    // dir can be nullptr if path contains subdirectories, create those prior to creating the file.
+    if (dir == nullptr) {
+        dir = backing->CreateSubdirectory(Common::FS::GetParentPath(path));
+    }
+    auto file = dir->CreateFile(Common::FS::GetFilename(path));
+    if (file == nullptr) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+    if (!file->Resize(size)) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+    return RESULT_SUCCESS;
+}
+
+ResultCode VfsDirectoryServiceWrapper::DeleteFile(const std::string& path_) const {
+    std::string path(Common::FS::SanitizePath(path_));
+    if (path.empty()) {
+        // TODO(DarkLordZach): Why do games call this and what should it do? Works as is but...
+        return RESULT_SUCCESS;
+    }
+
+    auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
+    if (dir == nullptr || dir->GetFile(Common::FS::GetFilename(path)) == nullptr) {
+        return FileSys::ERROR_PATH_NOT_FOUND;
+    }
+    if (!dir->DeleteFile(Common::FS::GetFilename(path))) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+
+    return RESULT_SUCCESS;
+}
+
+ResultCode VfsDirectoryServiceWrapper::CreateDirectory(const std::string& path_) const {
+    std::string path(Common::FS::SanitizePath(path_));
+    auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
+    if (dir == nullptr || Common::FS::GetFilename(Common::FS::GetParentPath(path)).empty()) {
+        dir = backing;
+    }
+    auto new_dir = dir->CreateSubdirectory(Common::FS::GetFilename(path));
+    if (new_dir == nullptr) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+    return RESULT_SUCCESS;
+}
+
+ResultCode VfsDirectoryServiceWrapper::DeleteDirectory(const std::string& path_) const {
+    std::string path(Common::FS::SanitizePath(path_));
+    auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
+    if (!dir->DeleteSubdirectory(Common::FS::GetFilename(path))) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+    return RESULT_SUCCESS;
+}
+
+ResultCode VfsDirectoryServiceWrapper::DeleteDirectoryRecursively(const std::string& path_) const {
+    std::string path(Common::FS::SanitizePath(path_));
+    auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(path));
+    if (!dir->DeleteSubdirectoryRecursive(Common::FS::GetFilename(path))) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+    return RESULT_SUCCESS;
+}
+
+ResultCode VfsDirectoryServiceWrapper::CleanDirectoryRecursively(const std::string& path) const {
+    const std::string sanitized_path(Common::FS::SanitizePath(path));
+    auto dir = GetDirectoryRelativeWrapped(backing, Common::FS::GetParentPath(sanitized_path));
+
+    if (!dir->CleanSubdirectoryRecursive(Common::FS::GetFilename(sanitized_path))) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+
+    return RESULT_SUCCESS;
+}
+
+ResultCode VfsDirectoryServiceWrapper::RenameFile(const std::string& src_path_,
+                                                  const std::string& dest_path_) const {
+    std::string src_path(Common::FS::SanitizePath(src_path_));
+    std::string dest_path(Common::FS::SanitizePath(dest_path_));
+    auto src = backing->GetFileRelative(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;
+        if (!src->Rename(Common::FS::GetFilename(dest_path))) {
+            // TODO(DarkLordZach): Find a better error code for this
+            return RESULT_UNKNOWN;
+        }
+        return RESULT_SUCCESS;
+    }
+
+    // Move by hand -- TODO(DarkLordZach): Optimize
+    auto c_res = CreateFile(dest_path, src->GetSize());
+    if (c_res != RESULT_SUCCESS)
+        return c_res;
+
+    auto dest = backing->GetFileRelative(dest_path);
+    ASSERT_MSG(dest != nullptr, "Newly created file with success cannot be found.");
+
+    ASSERT_MSG(dest->WriteBytes(src->ReadAllBytes()) == src->GetSize(),
+               "Could not write all of the bytes but everything else has succeded.");
+
+    if (!src->GetContainingDirectory()->DeleteFile(Common::FS::GetFilename(src_path))) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+
+    return RESULT_SUCCESS;
+}
+
+ResultCode VfsDirectoryServiceWrapper::RenameDirectory(const std::string& src_path_,
+                                                       const std::string& dest_path_) const {
+    std::string src_path(Common::FS::SanitizePath(src_path_));
+    std::string dest_path(Common::FS::SanitizePath(dest_path_));
+    auto src = GetDirectoryRelativeWrapped(backing, 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;
+        if (!src->Rename(Common::FS::GetFilename(dest_path))) {
+            // TODO(DarkLordZach): Find a better error code for this
+            return RESULT_UNKNOWN;
+        }
+        return RESULT_SUCCESS;
+    }
+
+    // TODO(DarkLordZach): Implement renaming across the tree (move).
+    ASSERT_MSG(false,
+               "Could not rename directory with path \"{}\" to new path \"{}\" because parent dirs "
+               "don't match -- UNIMPLEMENTED",
+               src_path, dest_path);
+
+    // TODO(DarkLordZach): Find a better error code for this
+    return RESULT_UNKNOWN;
+}
+
+ResultVal<FileSys::VirtualFile> VfsDirectoryServiceWrapper::OpenFile(const std::string& path_,
+                                                                     FileSys::Mode mode) const {
+    const std::string path(Common::FS::SanitizePath(path_));
+    std::string_view npath = path;
+    while (!npath.empty() && (npath[0] == '/' || npath[0] == '\\')) {
+        npath.remove_prefix(1);
+    }
+
+    auto file = backing->GetFileRelative(npath);
+    if (file == nullptr) {
+        return FileSys::ERROR_PATH_NOT_FOUND;
+    }
+
+    if (mode == FileSys::Mode::Append) {
+        return MakeResult<FileSys::VirtualFile>(
+            std::make_shared<FileSys::OffsetVfsFile>(file, 0, file->GetSize()));
+    }
+
+    return MakeResult<FileSys::VirtualFile>(file);
+}
+
+ResultVal<FileSys::VirtualDir> VfsDirectoryServiceWrapper::OpenDirectory(const std::string& path_) {
+    std::string path(Common::FS::SanitizePath(path_));
+    auto dir = GetDirectoryRelativeWrapped(backing, path);
+    if (dir == nullptr) {
+        // TODO(DarkLordZach): Find a better error code for this
+        return FileSys::ERROR_PATH_NOT_FOUND;
+    }
+    return MakeResult(dir);
+}
+
+ResultVal<FileSys::EntryType> VfsDirectoryServiceWrapper::GetEntryType(
+    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;
+    auto filename = Common::FS::GetFilename(path);
+    // TODO(Subv): Some games use the '/' path, find out what this means.
+    if (filename.empty())
+        return MakeResult(FileSys::EntryType::Directory);
+
+    if (dir->GetFile(filename) != nullptr)
+        return MakeResult(FileSys::EntryType::File);
+    if (dir->GetSubdirectory(filename) != nullptr)
+        return MakeResult(FileSys::EntryType::Directory);
+    return FileSys::ERROR_PATH_NOT_FOUND;
+}
+
+FileSystemController::FileSystemController(Core::System& system_) : system{system_} {}
+
+FileSystemController::~FileSystemController() = default;
+
+ResultCode FileSystemController::RegisterRomFS(std::unique_ptr<FileSys::RomFSFactory>&& factory) {
+    romfs_factory = std::move(factory);
+    LOG_DEBUG(Service_FS, "Registered RomFS");
+    return RESULT_SUCCESS;
+}
+
+ResultCode FileSystemController::RegisterSaveData(
+    std::unique_ptr<FileSys::SaveDataFactory>&& factory) {
+    ASSERT_MSG(save_data_factory == nullptr, "Tried to register a second save data");
+    save_data_factory = std::move(factory);
+    LOG_DEBUG(Service_FS, "Registered save data");
+    return RESULT_SUCCESS;
+}
+
+ResultCode FileSystemController::RegisterSDMC(std::unique_ptr<FileSys::SDMCFactory>&& factory) {
+    ASSERT_MSG(sdmc_factory == nullptr, "Tried to register a second SDMC");
+    sdmc_factory = std::move(factory);
+    LOG_DEBUG(Service_FS, "Registered SDMC");
+    return RESULT_SUCCESS;
+}
+
+ResultCode FileSystemController::RegisterBIS(std::unique_ptr<FileSys::BISFactory>&& factory) {
+    ASSERT_MSG(bis_factory == nullptr, "Tried to register a second BIS");
+    bis_factory = std::move(factory);
+    LOG_DEBUG(Service_FS, "Registered BIS");
+    return RESULT_SUCCESS;
+}
+
+void FileSystemController::SetPackedUpdate(FileSys::VirtualFile update_raw) {
+    LOG_TRACE(Service_FS, "Setting packed update for romfs");
+
+    if (romfs_factory == nullptr)
+        return;
+
+    romfs_factory->SetPackedUpdate(std::move(update_raw));
+}
+
+ResultVal<FileSys::VirtualFile> FileSystemController::OpenRomFSCurrentProcess() const {
+    LOG_TRACE(Service_FS, "Opening RomFS for current process");
+
+    if (romfs_factory == nullptr) {
+        // TODO(bunnei): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+
+    return romfs_factory->OpenCurrentProcess(system.CurrentProcess()->GetTitleID());
+}
+
+ResultVal<FileSys::VirtualFile> FileSystemController::OpenPatchedRomFS(
+    u64 title_id, FileSys::ContentRecordType type) const {
+    LOG_TRACE(Service_FS, "Opening patched RomFS for title_id={:016X}", title_id);
+
+    if (romfs_factory == nullptr) {
+        // TODO: Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+
+    return romfs_factory->OpenPatchedRomFS(title_id, type);
+}
+
+ResultVal<FileSys::VirtualFile> FileSystemController::OpenPatchedRomFSWithProgramIndex(
+    u64 title_id, u8 program_index, FileSys::ContentRecordType type) const {
+    LOG_TRACE(Service_FS, "Opening patched RomFS for title_id={:016X}, program_index={}", title_id,
+              program_index);
+
+    if (romfs_factory == nullptr) {
+        // TODO: Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+
+    return romfs_factory->OpenPatchedRomFSWithProgramIndex(title_id, program_index, 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, storage_id, type);
+
+    if (romfs_factory == nullptr) {
+        // TODO(bunnei): Find a better error code for this
+        return RESULT_UNKNOWN;
+    }
+
+    return romfs_factory->Open(title_id, storage_id, type);
+}
+
+ResultVal<FileSys::VirtualDir> FileSystemController::CreateSaveData(
+    FileSys::SaveDataSpaceId space, const FileSys::SaveDataAttribute& save_struct) const {
+    LOG_TRACE(Service_FS, "Creating Save Data for space_id={:01X}, save_struct={}", space,
+              save_struct.DebugInfo());
+
+    if (save_data_factory == nullptr) {
+        return FileSys::ERROR_ENTITY_NOT_FOUND;
+    }
+
+    return save_data_factory->Create(space, save_struct);
+}
+
+ResultVal<FileSys::VirtualDir> FileSystemController::OpenSaveData(
+    FileSys::SaveDataSpaceId space, const FileSys::SaveDataAttribute& attribute) const {
+    LOG_TRACE(Service_FS, "Opening Save Data for space_id={:01X}, save_struct={}", space,
+              attribute.DebugInfo());
+
+    if (save_data_factory == nullptr) {
+        return FileSys::ERROR_ENTITY_NOT_FOUND;
+    }
+
+    return save_data_factory->Open(space, attribute);
+}
+
+ResultVal<FileSys::VirtualDir> FileSystemController::OpenSaveDataSpace(
+    FileSys::SaveDataSpaceId space) const {
+    LOG_TRACE(Service_FS, "Opening Save Data Space for space_id={:01X}", space);
+
+    if (save_data_factory == nullptr) {
+        return FileSys::ERROR_ENTITY_NOT_FOUND;
+    }
+
+    return MakeResult(save_data_factory->GetSaveDataSpaceDirectory(space));
+}
+
+ResultVal<FileSys::VirtualDir> FileSystemController::OpenSDMC() const {
+    LOG_TRACE(Service_FS, "Opening SDMC");
+
+    if (sdmc_factory == nullptr) {
+        return FileSys::ERROR_SD_CARD_NOT_FOUND;
+    }
+
+    return sdmc_factory->Open();
+}
+
+ResultVal<FileSys::VirtualDir> FileSystemController::OpenBISPartition(
+    FileSys::BisPartitionId id) const {
+    LOG_TRACE(Service_FS, "Opening BIS Partition with id={:08X}", id);
+
+    if (bis_factory == nullptr) {
+        return FileSys::ERROR_ENTITY_NOT_FOUND;
+    }
+
+    auto part = bis_factory->OpenPartition(id);
+    if (part == nullptr) {
+        return FileSys::ERROR_INVALID_ARGUMENT;
+    }
+
+    return MakeResult<FileSys::VirtualDir>(std::move(part));
+}
+
+ResultVal<FileSys::VirtualFile> FileSystemController::OpenBISPartitionStorage(
+    FileSys::BisPartitionId id) const {
+    LOG_TRACE(Service_FS, "Opening BIS Partition Storage with id={:08X}", id);
+
+    if (bis_factory == nullptr) {
+        return FileSys::ERROR_ENTITY_NOT_FOUND;
+    }
+
+    auto part = bis_factory->OpenPartitionStorage(id, system.GetFilesystem());
+    if (part == nullptr) {
+        return FileSys::ERROR_INVALID_ARGUMENT;
+    }
+
+    return MakeResult<FileSys::VirtualFile>(std::move(part));
+}
+
+u64 FileSystemController::GetFreeSpaceSize(FileSys::StorageId id) const {
+    switch (id) {
+    case FileSys::StorageId::None:
+    case FileSys::StorageId::GameCard:
+        return 0;
+    case FileSys::StorageId::SdCard:
+        if (sdmc_factory == nullptr)
+            return 0;
+        return sdmc_factory->GetSDMCFreeSpace();
+    case FileSys::StorageId::Host:
+        if (bis_factory == nullptr)
+            return 0;
+        return bis_factory->GetSystemNANDFreeSpace() + bis_factory->GetUserNANDFreeSpace();
+    case FileSys::StorageId::NandSystem:
+        if (bis_factory == nullptr)
+            return 0;
+        return bis_factory->GetSystemNANDFreeSpace();
+    case FileSys::StorageId::NandUser:
+        if (bis_factory == nullptr)
+            return 0;
+        return bis_factory->GetUserNANDFreeSpace();
+    }
+
+    return 0;
+}
+
+u64 FileSystemController::GetTotalSpaceSize(FileSys::StorageId id) const {
+    switch (id) {
+    case FileSys::StorageId::None:
+    case FileSys::StorageId::GameCard:
+        return 0;
+    case FileSys::StorageId::SdCard:
+        if (sdmc_factory == nullptr)
+            return 0;
+        return sdmc_factory->GetSDMCTotalSpace();
+    case FileSys::StorageId::Host:
+        if (bis_factory == nullptr)
+            return 0;
+        return bis_factory->GetFullNANDTotalSpace();
+    case FileSys::StorageId::NandSystem:
+        if (bis_factory == nullptr)
+            return 0;
+        return bis_factory->GetSystemNANDTotalSpace();
+    case FileSys::StorageId::NandUser:
+        if (bis_factory == nullptr)
+            return 0;
+        return bis_factory->GetUserNANDTotalSpace();
+    }
+
+    return 0;
+}
+
+FileSys::SaveDataSize FileSystemController::ReadSaveDataSize(FileSys::SaveDataType type,
+                                                             u64 title_id, u128 user_id) const {
+    if (save_data_factory == nullptr) {
+        return {0, 0};
+    }
+
+    const auto value = save_data_factory->ReadSaveDataSize(type, title_id, user_id);
+
+    if (value.normal == 0 && value.journal == 0) {
+        FileSys::SaveDataSize new_size{SUFFICIENT_SAVE_DATA_SIZE, SUFFICIENT_SAVE_DATA_SIZE};
+
+        FileSys::NACP nacp;
+        const auto res = system.GetAppLoader().ReadControlData(nacp);
+
+        if (res != Loader::ResultStatus::Success) {
+            const FileSys::PatchManager pm{system.CurrentProcess()->GetTitleID(),
+                                           system.GetFileSystemController(),
+                                           system.GetContentProvider()};
+            const auto metadata = pm.GetControlMetadata();
+            const auto& nacp_unique = metadata.first;
+
+            if (nacp_unique != nullptr) {
+                new_size = {nacp_unique->GetDefaultNormalSaveSize(),
+                            nacp_unique->GetDefaultJournalSaveSize()};
+            }
+        } else {
+            new_size = {nacp.GetDefaultNormalSaveSize(), nacp.GetDefaultJournalSaveSize()};
+        }
+
+        WriteSaveDataSize(type, title_id, user_id, new_size);
+        return new_size;
+    }
+
+    return value;
+}
+
+void FileSystemController::WriteSaveDataSize(FileSys::SaveDataType type, u64 title_id, u128 user_id,
+                                             FileSys::SaveDataSize new_value) const {
+    if (save_data_factory != nullptr)
+        save_data_factory->WriteSaveDataSize(type, title_id, user_id, new_value);
+}
+
+void FileSystemController::SetGameCard(FileSys::VirtualFile file) {
+    gamecard = std::make_unique<FileSys::XCI>(file);
+    const auto dir = gamecard->ConcatenatedPseudoDirectory();
+    gamecard_registered = std::make_unique<FileSys::RegisteredCache>(dir);
+    gamecard_placeholder = std::make_unique<FileSys::PlaceholderCache>(dir);
+}
+
+FileSys::XCI* FileSystemController::GetGameCard() const {
+    return gamecard.get();
+}
+
+FileSys::RegisteredCache* FileSystemController::GetGameCardContents() const {
+    return gamecard_registered.get();
+}
+
+FileSys::PlaceholderCache* FileSystemController::GetGameCardPlaceholder() const {
+    return gamecard_placeholder.get();
+}
+
+FileSys::RegisteredCache* FileSystemController::GetSystemNANDContents() const {
+    LOG_TRACE(Service_FS, "Opening System NAND Contents");
+
+    if (bis_factory == nullptr)
+        return nullptr;
+
+    return bis_factory->GetSystemNANDContents();
+}
+
+FileSys::RegisteredCache* FileSystemController::GetUserNANDContents() const {
+    LOG_TRACE(Service_FS, "Opening User NAND Contents");
+
+    if (bis_factory == nullptr)
+        return nullptr;
+
+    return bis_factory->GetUserNANDContents();
+}
+
+FileSys::RegisteredCache* FileSystemController::GetSDMCContents() const {
+    LOG_TRACE(Service_FS, "Opening SDMC Contents");
+
+    if (sdmc_factory == nullptr)
+        return nullptr;
+
+    return sdmc_factory->GetSDMCContents();
+}
+
+FileSys::PlaceholderCache* FileSystemController::GetSystemNANDPlaceholder() const {
+    LOG_TRACE(Service_FS, "Opening System NAND Placeholder");
+
+    if (bis_factory == nullptr)
+        return nullptr;
+
+    return bis_factory->GetSystemNANDPlaceholder();
+}
+
+FileSys::PlaceholderCache* FileSystemController::GetUserNANDPlaceholder() const {
+    LOG_TRACE(Service_FS, "Opening User NAND Placeholder");
+
+    if (bis_factory == nullptr)
+        return nullptr;
+
+    return bis_factory->GetUserNANDPlaceholder();
+}
+
+FileSys::PlaceholderCache* FileSystemController::GetSDMCPlaceholder() const {
+    LOG_TRACE(Service_FS, "Opening SDMC Placeholder");
+
+    if (sdmc_factory == nullptr)
+        return nullptr;
+
+    return sdmc_factory->GetSDMCPlaceholder();
+}
+
+FileSys::RegisteredCache* FileSystemController::GetRegisteredCacheForStorage(
+    FileSys::StorageId id) const {
+    switch (id) {
+    case FileSys::StorageId::None:
+    case FileSys::StorageId::Host:
+        UNIMPLEMENTED();
+        return nullptr;
+    case FileSys::StorageId::GameCard:
+        return GetGameCardContents();
+    case FileSys::StorageId::NandSystem:
+        return GetSystemNANDContents();
+    case FileSys::StorageId::NandUser:
+        return GetUserNANDContents();
+    case FileSys::StorageId::SdCard:
+        return GetSDMCContents();
+    }
+
+    return nullptr;
+}
+
+FileSys::PlaceholderCache* FileSystemController::GetPlaceholderCacheForStorage(
+    FileSys::StorageId id) const {
+    switch (id) {
+    case FileSys::StorageId::None:
+    case FileSys::StorageId::Host:
+        UNIMPLEMENTED();
+        return nullptr;
+    case FileSys::StorageId::GameCard:
+        return GetGameCardPlaceholder();
+    case FileSys::StorageId::NandSystem:
+        return GetSystemNANDPlaceholder();
+    case FileSys::StorageId::NandUser:
+        return GetUserNANDPlaceholder();
+    case FileSys::StorageId::SdCard:
+        return GetSDMCPlaceholder();
+    }
+
+    return nullptr;
+}
+
+FileSys::VirtualDir FileSystemController::GetSystemNANDContentDirectory() const {
+    LOG_TRACE(Service_FS, "Opening system NAND content directory");
+
+    if (bis_factory == nullptr)
+        return nullptr;
+
+    return bis_factory->GetSystemNANDContentDirectory();
+}
+
+FileSys::VirtualDir FileSystemController::GetUserNANDContentDirectory() const {
+    LOG_TRACE(Service_FS, "Opening user NAND content directory");
+
+    if (bis_factory == nullptr)
+        return nullptr;
+
+    return bis_factory->GetUserNANDContentDirectory();
+}
+
+FileSys::VirtualDir FileSystemController::GetSDMCContentDirectory() const {
+    LOG_TRACE(Service_FS, "Opening SDMC content directory");
+
+    if (sdmc_factory == nullptr)
+        return nullptr;
+
+    return sdmc_factory->GetSDMCContentDirectory();
+}
+
+FileSys::VirtualDir FileSystemController::GetNANDImageDirectory() const {
+    LOG_TRACE(Service_FS, "Opening NAND image directory");
+
+    if (bis_factory == nullptr)
+        return nullptr;
+
+    return bis_factory->GetImageDirectory();
+}
+
+FileSys::VirtualDir FileSystemController::GetSDMCImageDirectory() const {
+    LOG_TRACE(Service_FS, "Opening SDMC image directory");
+
+    if (sdmc_factory == nullptr)
+        return nullptr;
+
+    return sdmc_factory->GetImageDirectory();
+}
+
+FileSys::VirtualDir FileSystemController::GetContentDirectory(ContentStorageId id) const {
+    switch (id) {
+    case ContentStorageId::System:
+        return GetSystemNANDContentDirectory();
+    case ContentStorageId::User:
+        return GetUserNANDContentDirectory();
+    case ContentStorageId::SdCard:
+        return GetSDMCContentDirectory();
+    }
+
+    return nullptr;
+}
+
+FileSys::VirtualDir FileSystemController::GetImageDirectory(ImageDirectoryId id) const {
+    switch (id) {
+    case ImageDirectoryId::NAND:
+        return GetNANDImageDirectory();
+    case ImageDirectoryId::SdCard:
+        return GetSDMCImageDirectory();
+    }
+
+    return nullptr;
+}
+
+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)
+        return nullptr;
+
+    return bis_factory->GetModificationLoadRoot(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)
+        return nullptr;
+
+    return bis_factory->GetModificationDumpRoot(title_id);
+}
+
+FileSys::VirtualDir FileSystemController::GetBCATDirectory(u64 title_id) const {
+    LOG_TRACE(Service_FS, "Opening BCAT root for tid={:016X}", title_id);
+
+    if (bis_factory == nullptr)
+        return nullptr;
+
+    return bis_factory->GetBCATDirectory(title_id);
+}
+
+void FileSystemController::CreateFactories(FileSys::VfsFilesystem& vfs, bool overwrite) {
+    if (overwrite) {
+        bis_factory = nullptr;
+        save_data_factory = nullptr;
+        sdmc_factory = nullptr;
+    }
+
+    auto nand_directory = vfs.OpenDirectory(Common::FS::GetUserPath(Common::FS::UserPath::NANDDir),
+                                            FileSys::Mode::ReadWrite);
+    auto sd_directory = vfs.OpenDirectory(Common::FS::GetUserPath(Common::FS::UserPath::SDMCDir),
+                                          FileSys::Mode::ReadWrite);
+    auto load_directory = vfs.OpenDirectory(Common::FS::GetUserPath(Common::FS::UserPath::LoadDir),
+                                            FileSys::Mode::ReadWrite);
+    auto dump_directory = vfs.OpenDirectory(Common::FS::GetUserPath(Common::FS::UserPath::DumpDir),
+                                            FileSys::Mode::ReadWrite);
+
+    if (bis_factory == nullptr) {
+        bis_factory =
+            std::make_unique<FileSys::BISFactory>(nand_directory, load_directory, dump_directory);
+        system.RegisterContentProvider(FileSys::ContentProviderUnionSlot::SysNAND,
+                                       bis_factory->GetSystemNANDContents());
+        system.RegisterContentProvider(FileSys::ContentProviderUnionSlot::UserNAND,
+                                       bis_factory->GetUserNANDContents());
+    }
+
+    if (save_data_factory == nullptr) {
+        save_data_factory =
+            std::make_unique<FileSys::SaveDataFactory>(system, std::move(nand_directory));
+    }
+
+    if (sdmc_factory == nullptr) {
+        sdmc_factory = std::make_unique<FileSys::SDMCFactory>(std::move(sd_directory));
+        system.RegisterContentProvider(FileSys::ContentProviderUnionSlot::SDMC,
+                                       sdmc_factory->GetSDMCContents());
+    }
+}
+
+void InstallInterfaces(Core::System& system) {
+    std::make_shared<FSP_LDR>(system)->InstallAsService(system.ServiceManager());
+    std::make_shared<FSP_PR>(system)->InstallAsService(system.ServiceManager());
+    std::make_shared<FSP_SRV>(system)->InstallAsService(system.ServiceManager());
+}
+
+} // namespace Service::FileSystem

src/core/hle/service/filesystem/filesystem.h

@@ -0,0 +1,245 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "common/common_types.h"
+#include "core/file_sys/directory.h"
+#include "core/file_sys/vfs.h"
+#include "core/hle/result.h"
+
+namespace Core {
+class System;
+}
+
+namespace FileSys {
+class BISFactory;
+class RegisteredCache;
+class RegisteredCacheUnion;
+class PlaceholderCache;
+class RomFSFactory;
+class SaveDataFactory;
+class SDMCFactory;
+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;
+
+struct SaveDataAttribute;
+struct SaveDataSize;
+} // namespace FileSys
+
+namespace Service {
+
+namespace SM {
+class ServiceManager;
+} // namespace SM
+
+namespace FileSystem {
+
+enum class ContentStorageId : u32 {
+    System,
+    User,
+    SdCard,
+};
+
+enum class ImageDirectoryId : u32 {
+    NAND,
+    SdCard,
+};
+
+class FileSystemController {
+public:
+    explicit FileSystemController(Core::System& system_);
+    ~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() const;
+    ResultVal<FileSys::VirtualFile> OpenPatchedRomFS(u64 title_id,
+                                                     FileSys::ContentRecordType type) const;
+    ResultVal<FileSys::VirtualFile> OpenPatchedRomFSWithProgramIndex(
+        u64 title_id, u8 program_index, FileSys::ContentRecordType type) const;
+    ResultVal<FileSys::VirtualFile> OpenRomFS(u64 title_id, FileSys::StorageId storage_id,
+                                              FileSys::ContentRecordType type) const;
+    ResultVal<FileSys::VirtualDir> CreateSaveData(
+        FileSys::SaveDataSpaceId space, const FileSys::SaveDataAttribute& save_struct) const;
+    ResultVal<FileSys::VirtualDir> OpenSaveData(
+        FileSys::SaveDataSpaceId space, const FileSys::SaveDataAttribute& 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) const;
+    void WriteSaveDataSize(FileSys::SaveDataType type, u64 title_id, u128 user_id,
+                           FileSys::SaveDataSize new_value) const;
+
+    void SetGameCard(FileSys::VirtualFile file);
+    FileSys::XCI* GetGameCard() const;
+
+    FileSys::RegisteredCache* GetSystemNANDContents() const;
+    FileSys::RegisteredCache* GetUserNANDContents() const;
+    FileSys::RegisteredCache* GetSDMCContents() const;
+    FileSys::RegisteredCache* GetGameCardContents() const;
+
+    FileSys::PlaceholderCache* GetSystemNANDPlaceholder() const;
+    FileSys::PlaceholderCache* GetUserNANDPlaceholder() const;
+    FileSys::PlaceholderCache* GetSDMCPlaceholder() const;
+    FileSys::PlaceholderCache* GetGameCardPlaceholder() const;
+
+    FileSys::RegisteredCache* GetRegisteredCacheForStorage(FileSys::StorageId id) const;
+    FileSys::PlaceholderCache* GetPlaceholderCacheForStorage(FileSys::StorageId id) const;
+
+    FileSys::VirtualDir GetSystemNANDContentDirectory() const;
+    FileSys::VirtualDir GetUserNANDContentDirectory() const;
+    FileSys::VirtualDir GetSDMCContentDirectory() const;
+
+    FileSys::VirtualDir GetNANDImageDirectory() const;
+    FileSys::VirtualDir GetSDMCImageDirectory() const;
+
+    FileSys::VirtualDir GetContentDirectory(ContentStorageId id) const;
+    FileSys::VirtualDir GetImageDirectory(ImageDirectoryId id) const;
+
+    FileSys::VirtualDir GetModificationLoadRoot(u64 title_id) const;
+    FileSys::VirtualDir GetModificationDumpRoot(u64 title_id) const;
+
+    FileSys::VirtualDir GetBCATDirectory(u64 title_id) const;
+
+    // Creates the SaveData, SDMC, and BIS Factories. Should be called once and before any function
+    // above is called.
+    void CreateFactories(FileSys::VfsFilesystem& vfs, bool overwrite = true);
+
+private:
+    std::unique_ptr<FileSys::RomFSFactory> romfs_factory;
+    std::unique_ptr<FileSys::SaveDataFactory> save_data_factory;
+    std::unique_ptr<FileSys::SDMCFactory> sdmc_factory;
+    std::unique_ptr<FileSys::BISFactory> bis_factory;
+
+    std::unique_ptr<FileSys::XCI> gamecard;
+    std::unique_ptr<FileSys::RegisteredCache> gamecard_registered;
+    std::unique_ptr<FileSys::PlaceholderCache> gamecard_placeholder;
+
+    Core::System& system;
+};
+
+void InstallInterfaces(Core::System& system);
+
+// A class that wraps a VfsDirectory with methods that return ResultVal and ResultCode instead of
+// pointers and booleans. This makes using a VfsDirectory with switch services much easier and
+// avoids repetitive code.
+class VfsDirectoryServiceWrapper {
+public:
+    explicit VfsDirectoryServiceWrapper(FileSys::VirtualDir backing);
+    ~VfsDirectoryServiceWrapper();
+
+    /**
+     * Get a descriptive name for the archive (e.g. "RomFS", "SaveData", etc.)
+     */
+    std::string GetName() const;
+
+    /**
+     * Create a file specified by its path
+     * @param path Path relative to the Archive
+     * @param size The size of the new file, filled with zeroes
+     * @return Result of the operation
+     */
+    ResultCode CreateFile(const std::string& path, u64 size) const;
+
+    /**
+     * Delete a file specified by its path
+     * @param path Path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode DeleteFile(const std::string& path) const;
+
+    /**
+     * Create a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode CreateDirectory(const std::string& path) const;
+
+    /**
+     * Delete a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode DeleteDirectory(const std::string& path) const;
+
+    /**
+     * Delete a directory specified by its path and anything under it
+     * @param path Path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode DeleteDirectoryRecursively(const std::string& path) const;
+
+    /**
+     * Cleans the specified directory. This is similar to DeleteDirectoryRecursively,
+     * in that it deletes all the contents of the specified directory, however, this
+     * function does *not* delete the directory itself. It only deletes everything
+     * within it.
+     *
+     * @param path Path relative to the archive.
+     *
+     * @return Result of the operation.
+     */
+    ResultCode CleanDirectoryRecursively(const std::string& path) const;
+
+    /**
+     * Rename a File specified by its path
+     * @param src_path Source path relative to the archive
+     * @param dest_path Destination path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode RenameFile(const std::string& src_path, const std::string& dest_path) const;
+
+    /**
+     * Rename a Directory specified by its path
+     * @param src_path Source path relative to the archive
+     * @param dest_path Destination path relative to the archive
+     * @return Result of the operation
+     */
+    ResultCode RenameDirectory(const std::string& src_path, const std::string& dest_path) const;
+
+    /**
+     * Open a file specified by its path, using the specified mode
+     * @param path Path relative to the archive
+     * @param mode Mode to open the file with
+     * @return Opened file, or error code
+     */
+    ResultVal<FileSys::VirtualFile> OpenFile(const std::string& path, FileSys::Mode mode) const;
+
+    /**
+     * Open a directory specified by its path
+     * @param path Path relative to the archive
+     * @return Opened directory, or error code
+     */
+    ResultVal<FileSys::VirtualDir> OpenDirectory(const std::string& path);
+
+    /**
+     * Get the type of the specified path
+     * @return The type of the specified path or error code
+     */
+    ResultVal<FileSys::EntryType> GetEntryType(const std::string& path) const;
+
+private:
+    FileSys::VirtualDir backing;
+};
+
+} // namespace FileSystem
+} // namespace Service

src/core/hle/service/filesystem/fsp_ldr.cpp

@@ -0,0 +1,24 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/hle/service/filesystem/fsp_ldr.h"
+#include "core/hle/service/service.h"
+
+namespace Service::FileSystem {
+
+FSP_LDR::FSP_LDR(Core::System& system_) : ServiceFramework{system_, "fsp:ldr"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "OpenCodeFileSystem"},
+        {1, nullptr, "IsArchivedProgram"},
+        {2, nullptr, "SetCurrentProcess"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+FSP_LDR::~FSP_LDR() = default;
+
+} // namespace Service::FileSystem

src/core/hle/service/filesystem/fsp_ldr.h

@@ -0,0 +1,21 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Core {
+class System;
+}
+
+namespace Service::FileSystem {
+
+class FSP_LDR final : public ServiceFramework<FSP_LDR> {
+public:
+    explicit FSP_LDR(Core::System& system_);
+    ~FSP_LDR() override;
+};
+
+} // namespace Service::FileSystem

src/core/hle/service/filesystem/fsp_pr.cpp

@@ -0,0 +1,25 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/hle/service/filesystem/fsp_pr.h"
+#include "core/hle/service/service.h"
+
+namespace Service::FileSystem {
+
+FSP_PR::FSP_PR(Core::System& system_) : ServiceFramework{system_, "fsp:pr"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "RegisterProgram"},
+        {1, nullptr, "UnregisterProgram"},
+        {2, nullptr, "SetCurrentProcess"},
+        {256, nullptr, "SetEnabledProgramVerification"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+FSP_PR::~FSP_PR() = default;
+
+} // namespace Service::FileSystem

src/core/hle/service/filesystem/fsp_pr.h

@@ -0,0 +1,21 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Core {
+class System;
+}
+
+namespace Service::FileSystem {
+
+class FSP_PR final : public ServiceFramework<FSP_PR> {
+public:
+    explicit FSP_PR(Core::System& system_);
+    ~FSP_PR() override;
+};
+
+} // namespace Service::FileSystem

src/core/hle/service/filesystem/fsp_srv.h

@@ -0,0 +1,70 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/hle/service/service.h"
+
+namespace Core {
+class Reporter;
+}
+
+namespace FileSys {
+class ContentProvider;
+class FileSystemBackend;
+} // namespace FileSys
+
+namespace Service::FileSystem {
+
+enum class AccessLogVersion : u32 {
+    V7_0_0 = 2,
+
+    Latest = V7_0_0,
+};
+
+enum class LogMode : u32 {
+    Off,
+    Log,
+    RedirectToSdCard,
+    LogToSdCard = Log | RedirectToSdCard,
+};
+
+class FSP_SRV final : public ServiceFramework<FSP_SRV> {
+public:
+    explicit FSP_SRV(Core::System& system_);
+    ~FSP_SRV() override;
+
+private:
+    void SetCurrentProcess(Kernel::HLERequestContext& ctx);
+    void OpenFileSystemWithPatch(Kernel::HLERequestContext& ctx);
+    void OpenSdCardFileSystem(Kernel::HLERequestContext& ctx);
+    void CreateSaveDataFileSystem(Kernel::HLERequestContext& ctx);
+    void OpenSaveDataFileSystem(Kernel::HLERequestContext& ctx);
+    void OpenReadOnlySaveDataFileSystem(Kernel::HLERequestContext& ctx);
+    void OpenSaveDataInfoReaderBySaveDataSpaceId(Kernel::HLERequestContext& ctx);
+    void WriteSaveDataFileSystemExtraDataBySaveDataAttribute(Kernel::HLERequestContext& ctx);
+    void ReadSaveDataFileSystemExtraDataWithMaskBySaveDataAttribute(Kernel::HLERequestContext& ctx);
+    void OpenDataStorageByCurrentProcess(Kernel::HLERequestContext& ctx);
+    void OpenDataStorageByDataId(Kernel::HLERequestContext& ctx);
+    void OpenPatchDataStorageByCurrentProcess(Kernel::HLERequestContext& ctx);
+    void OpenDataStorageWithProgramIndex(Kernel::HLERequestContext& ctx);
+    void SetGlobalAccessLogMode(Kernel::HLERequestContext& ctx);
+    void GetGlobalAccessLogMode(Kernel::HLERequestContext& ctx);
+    void OutputAccessLogToSdCard(Kernel::HLERequestContext& ctx);
+    void GetAccessLogVersionInfo(Kernel::HLERequestContext& ctx);
+    void OpenMultiCommitManager(Kernel::HLERequestContext& ctx);
+
+    FileSystemController& fsc;
+    const FileSys::ContentProvider& content_provider;
+
+    FileSys::VirtualFile romfs;
+    u64 current_process_id = 0;
+    u32 access_log_program_index = 0;
+    LogMode log_mode = LogMode::LogToSdCard;
+
+    const Core::Reporter& reporter;
+};
+
+} // namespace Service::FileSystem