131 files changed, 3291 insertions, 936 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 45a0d8746..347bbf2d0 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -20,28 +20,49 @@ add_library(core STATIC
     cpu_manager.h
     crypto/aes_util.cpp
     crypto/aes_util.h
+    crypto/ctr_encryption_layer.cpp
+    crypto/ctr_encryption_layer.h
     crypto/encryption_layer.cpp
     crypto/encryption_layer.h
     crypto/key_manager.cpp
     crypto/key_manager.h
     crypto/partition_data_manager.cpp
     crypto/partition_data_manager.h
-    crypto/ctr_encryption_layer.cpp
-    crypto/ctr_encryption_layer.h
     crypto/xts_encryption_layer.cpp
     crypto/xts_encryption_layer.h
-    debugger/debugger_interface.h
     debugger/debugger.cpp
     debugger/debugger.h
-    debugger/gdbstub_arch.cpp
-    debugger/gdbstub_arch.h
+    debugger/debugger_interface.h
     debugger/gdbstub.cpp
     debugger/gdbstub.h
+    debugger/gdbstub_arch.cpp
+    debugger/gdbstub_arch.h
     device_memory_manager.h
     device_memory_manager.inc
     device_memory.cpp
     device_memory.h
+    file_sys/bis_factory.cpp
+    file_sys/bis_factory.h
+    file_sys/card_image.cpp
+    file_sys/card_image.h
+    file_sys/common_funcs.h
+    file_sys/content_archive.cpp
+    file_sys/content_archive.h
+    file_sys/control_metadata.cpp
+    file_sys/control_metadata.h
+    file_sys/errors.h
+    file_sys/fs_directory.h
+    file_sys/fs_file.h
+    file_sys/fs_filesystem.h
+    file_sys/fs_memory_management.h
+    file_sys/fs_operate_range.h
+    file_sys/fs_path.h
+    file_sys/fs_path_utility.h
+    file_sys/fs_string_util.h
+    file_sys/fsmitm_romfsbuild.cpp
+    file_sys/fsmitm_romfsbuild.h
     file_sys/fssystem/fs_i_storage.h
+    file_sys/fssystem/fs_types.h
     file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.cpp
     file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.h
     file_sys/fssystem/fssystem_aes_ctr_storage.cpp
@@ -83,25 +104,10 @@ add_library(core STATIC
     file_sys/fssystem/fssystem_switch_storage.h
     file_sys/fssystem/fssystem_utility.cpp
     file_sys/fssystem/fssystem_utility.h
-    file_sys/fssystem/fs_types.h
-    file_sys/bis_factory.cpp
-    file_sys/bis_factory.h
-    file_sys/card_image.cpp
-    file_sys/card_image.h
-    file_sys/common_funcs.h
-    file_sys/content_archive.cpp
-    file_sys/content_archive.h
-    file_sys/control_metadata.cpp
-    file_sys/control_metadata.h
-    file_sys/directory.h
-    file_sys/errors.h
-    file_sys/fsmitm_romfsbuild.cpp
-    file_sys/fsmitm_romfsbuild.h
     file_sys/ips_layer.cpp
     file_sys/ips_layer.h
     file_sys/kernel_executable.cpp
     file_sys/kernel_executable.h
-    file_sys/mode.h
     file_sys/nca_metadata.cpp
     file_sys/nca_metadata.h
     file_sys/partition_filesystem.cpp
@@ -146,22 +152,22 @@ add_library(core STATIC
     file_sys/system_archive/system_version.h
     file_sys/system_archive/time_zone_binary.cpp
     file_sys/system_archive/time_zone_binary.h
-    file_sys/vfs.cpp
-    file_sys/vfs.h
-    file_sys/vfs_cached.cpp
-    file_sys/vfs_cached.h
-    file_sys/vfs_concat.cpp
-    file_sys/vfs_concat.h
-    file_sys/vfs_layered.cpp
-    file_sys/vfs_layered.h
-    file_sys/vfs_offset.cpp
-    file_sys/vfs_offset.h
-    file_sys/vfs_real.cpp
-    file_sys/vfs_real.h
-    file_sys/vfs_static.h
-    file_sys/vfs_types.h
-    file_sys/vfs_vector.cpp
-    file_sys/vfs_vector.h
+    file_sys/vfs/vfs.cpp
+    file_sys/vfs/vfs.h
+    file_sys/vfs/vfs_cached.cpp
+    file_sys/vfs/vfs_cached.h
+    file_sys/vfs/vfs_concat.cpp
+    file_sys/vfs/vfs_concat.h
+    file_sys/vfs/vfs_layered.cpp
+    file_sys/vfs/vfs_layered.h
+    file_sys/vfs/vfs_offset.cpp
+    file_sys/vfs/vfs_offset.h
+    file_sys/vfs/vfs_real.cpp
+    file_sys/vfs/vfs_real.h
+    file_sys/vfs/vfs_static.h
+    file_sys/vfs/vfs_types.h
+    file_sys/vfs/vfs_vector.cpp
+    file_sys/vfs/vfs_vector.h
     file_sys/xts_archive.cpp
     file_sys/xts_archive.h
     frontend/applets/cabinet.cpp
@@ -194,7 +200,6 @@ add_library(core STATIC
     hle/kernel/board/nintendo/nx/secure_monitor.h
     hle/kernel/code_set.cpp
     hle/kernel/code_set.h
-    hle/kernel/svc_results.h
     hle/kernel/global_scheduler_context.cpp
     hle/kernel/global_scheduler_context.h
     hle/kernel/init/init_slab_setup.cpp
@@ -204,11 +209,11 @@ add_library(core STATIC
     hle/kernel/k_address_arbiter.h
     hle/kernel/k_address_space_info.cpp
     hle/kernel/k_address_space_info.h
+    hle/kernel/k_affinity_mask.h
     hle/kernel/k_auto_object.cpp
     hle/kernel/k_auto_object.h
     hle/kernel/k_auto_object_container.cpp
     hle/kernel/k_auto_object_container.h
-    hle/kernel/k_affinity_mask.h
     hle/kernel/k_capabilities.cpp
     hle/kernel/k_capabilities.h
     hle/kernel/k_class_token.cpp
@@ -232,9 +237,9 @@ add_library(core STATIC
     hle/kernel/k_event_info.h
     hle/kernel/k_handle_table.cpp
     hle/kernel/k_handle_table.h
-    hle/kernel/k_hardware_timer_base.h
     hle/kernel/k_hardware_timer.cpp
     hle/kernel/k_hardware_timer.h
+    hle/kernel/k_hardware_timer_base.h
     hle/kernel/k_interrupt_manager.cpp
     hle/kernel/k_interrupt_manager.h
     hle/kernel/k_light_client_session.cpp
@@ -261,10 +266,10 @@ add_library(core STATIC
     hle/kernel/k_page_bitmap.h
     hle/kernel/k_page_buffer.cpp
     hle/kernel/k_page_buffer.h
-    hle/kernel/k_page_heap.cpp
-    hle/kernel/k_page_heap.h
     hle/kernel/k_page_group.cpp
     hle/kernel/k_page_group.h
+    hle/kernel/k_page_heap.cpp
+    hle/kernel/k_page_heap.h
     hle/kernel/k_page_table.h
     hle/kernel/k_page_table_base.cpp
     hle/kernel/k_page_table_base.h
@@ -329,8 +334,6 @@ add_library(core STATIC
     hle/kernel/slab_helpers.h
     hle/kernel/svc.cpp
     hle/kernel/svc.h
-    hle/kernel/svc_common.h
-    hle/kernel/svc_types.h
     hle/kernel/svc/svc_activity.cpp
     hle/kernel/svc/svc_address_arbiter.cpp
     hle/kernel/svc/svc_address_translation.cpp
@@ -368,6 +371,9 @@ add_library(core STATIC
     hle/kernel/svc/svc_thread_profiler.cpp
     hle/kernel/svc/svc_tick.cpp
     hle/kernel/svc/svc_transfer_memory.cpp
+    hle/kernel/svc_common.h
+    hle/kernel/svc_results.h
+    hle/kernel/svc_types.h
     hle/result.h
     hle/service/acc/acc.cpp
     hle/service/acc/acc.h
@@ -486,14 +492,25 @@ add_library(core STATIC
     hle/service/fatal/fatal_p.h
     hle/service/fatal/fatal_u.cpp
     hle/service/fatal/fatal_u.h
+    hle/service/fgm/fgm.cpp
+    hle/service/fgm/fgm.h
     hle/service/filesystem/filesystem.cpp
     hle/service/filesystem/filesystem.h
-    hle/service/filesystem/fsp_ldr.cpp
-    hle/service/filesystem/fsp_ldr.h
-    hle/service/filesystem/fsp_pr.cpp
-    hle/service/filesystem/fsp_pr.h
-    hle/service/filesystem/fsp_srv.cpp
-    hle/service/filesystem/fsp_srv.h
+    hle/service/filesystem/fsp/fs_i_directory.cpp
+    hle/service/filesystem/fsp/fs_i_directory.h
+    hle/service/filesystem/fsp/fs_i_file.cpp
+    hle/service/filesystem/fsp/fs_i_file.h
+    hle/service/filesystem/fsp/fs_i_filesystem.cpp
+    hle/service/filesystem/fsp/fs_i_filesystem.h
+    hle/service/filesystem/fsp/fs_i_storage.cpp
+    hle/service/filesystem/fsp/fs_i_storage.h
+    hle/service/filesystem/fsp/fsp_ldr.cpp
+    hle/service/filesystem/fsp/fsp_ldr.h
+    hle/service/filesystem/fsp/fsp_pr.cpp
+    hle/service/filesystem/fsp/fsp_pr.h
+    hle/service/filesystem/fsp/fsp_srv.cpp
+    hle/service/filesystem/fsp/fsp_srv.h
+    hle/service/filesystem/fsp/fsp_util.h
     hle/service/filesystem/romfs_controller.cpp
     hle/service/filesystem/romfs_controller.h
     hle/service/filesystem/save_data_controller.cpp
@@ -551,13 +568,18 @@ add_library(core STATIC
     hle/service/hid/irs.h
     hle/service/hid/xcd.cpp
     hle/service/hid/xcd.h
+    hle/service/hle_ipc.cpp
+    hle/service/hle_ipc.h
+    hle/service/ipc_helpers.h
+    hle/service/kernel_helpers.cpp
+    hle/service/kernel_helpers.h
     hle/service/lbl/lbl.cpp
     hle/service/lbl/lbl.h
     hle/service/ldn/lan_discovery.cpp
     hle/service/ldn/lan_discovery.h
-    hle/service/ldn/ldn_results.h
     hle/service/ldn/ldn.cpp
     hle/service/ldn/ldn.h
+    hle/service/ldn/ldn_results.h
     hle/service/ldn/ldn_types.h
     hle/service/ldr/ldr.cpp
     hle/service/ldr/ldr.h
@@ -565,16 +587,6 @@ add_library(core STATIC
     hle/service/lm/lm.h
     hle/service/mig/mig.cpp
     hle/service/mig/mig.h
-    hle/service/mii/types/char_info.cpp
-    hle/service/mii/types/char_info.h
-    hle/service/mii/types/core_data.cpp
-    hle/service/mii/types/core_data.h
-    hle/service/mii/types/raw_data.cpp
-    hle/service/mii/types/raw_data.h
-    hle/service/mii/types/store_data.cpp
-    hle/service/mii/types/store_data.h
-    hle/service/mii/types/ver3_store_data.cpp
-    hle/service/mii/types/ver3_store_data.h
     hle/service/mii/mii.cpp
     hle/service/mii/mii.h
     hle/service/mii/mii_database.cpp
@@ -586,10 +598,22 @@ add_library(core STATIC
     hle/service/mii/mii_result.h
     hle/service/mii/mii_types.h
     hle/service/mii/mii_util.h
+    hle/service/mii/types/char_info.cpp
+    hle/service/mii/types/char_info.h
+    hle/service/mii/types/core_data.cpp
+    hle/service/mii/types/core_data.h
+    hle/service/mii/types/raw_data.cpp
+    hle/service/mii/types/raw_data.h
+    hle/service/mii/types/store_data.cpp
+    hle/service/mii/types/store_data.h
+    hle/service/mii/types/ver3_store_data.cpp
+    hle/service/mii/types/ver3_store_data.h
     hle/service/mm/mm_u.cpp
     hle/service/mm/mm_u.h
     hle/service/mnpp/mnpp_app.cpp
     hle/service/mnpp/mnpp_app.h
+    hle/service/mutex.cpp
+    hle/service/mutex.h
     hle/service/ncm/ncm.cpp
     hle/service/ncm/ncm.h
     hle/service/nfc/common/amiibo_crypto.cpp
@@ -759,19 +783,12 @@ add_library(core STATIC
     hle/service/ptm/ptm.h
     hle/service/ptm/ts.cpp
     hle/service/ptm/ts.h
-    hle/service/hle_ipc.cpp
-    hle/service/hle_ipc.h
-    hle/service/ipc_helpers.h
-    hle/service/kernel_helpers.cpp
-    hle/service/kernel_helpers.h
-    hle/service/mutex.cpp
-    hle/service/mutex.h
+    hle/service/ro/ro.cpp
+    hle/service/ro/ro.h
     hle/service/ro/ro_nro_utils.cpp
     hle/service/ro/ro_nro_utils.h
     hle/service/ro/ro_results.h
     hle/service/ro/ro_types.h
-    hle/service/ro/ro.cpp
-    hle/service/ro/ro.h
     hle/service/server_manager.cpp
     hle/service/server_manager.h
     hle/service/service.cpp
@@ -838,9 +855,9 @@ add_library(core STATIC
     internal_network/network.h
     internal_network/network_interface.cpp
     internal_network/network_interface.h
-    internal_network/sockets.h
     internal_network/socket_proxy.cpp
     internal_network/socket_proxy.h
+    internal_network/sockets.h
     loader/deconstructed_rom_directory.cpp
     loader/deconstructed_rom_directory.h
     loader/kip.cpp
@@ -859,13 +876,13 @@ add_library(core STATIC
     loader/nsp.h
     loader/xci.cpp
     loader/xci.h
+    memory.cpp
+    memory.h
     memory/cheat_engine.cpp
     memory/cheat_engine.h
     memory/dmnt_cheat_types.h
     memory/dmnt_cheat_vm.cpp
     memory/dmnt_cheat_vm.h
-    memory.cpp
-    memory.h
     perf_stats.cpp
     perf_stats.h
     precompiled_headers.h
diff --git a/src/core/core.cpp b/src/core/core.cpp
index dd9de948c..1b412ac98 100644
--- a/src/core/core.cpp
+++ b/src/core/core.cpp
@@ -21,13 +21,13 @@
 #include "core/debugger/debugger.h"
 #include "core/device_memory.h"
 #include "core/file_sys/bis_factory.h"
-#include "core/file_sys/mode.h"
+#include "core/file_sys/fs_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/vfs_concat.h"
-#include "core/file_sys/vfs_real.h"
+#include "core/file_sys/vfs/vfs_concat.h"
+#include "core/file_sys/vfs/vfs_real.h"
 #include "core/gpu_dirty_memory_manager.h"
 #include "core/hle/kernel/k_memory_manager.h"
 #include "core/hle/kernel/k_process.h"
@@ -102,7 +102,7 @@ FileSys::VirtualFile GetGameFileFromPath(const FileSys::VirtualFilesystem& vfs,
     Common::SplitPath(path, &dir_name, &filename, nullptr);
 
     if (filename == "00") {
-        const auto dir = vfs->OpenDirectory(dir_name, FileSys::Mode::Read);
+        const auto dir = vfs->OpenDirectory(dir_name, FileSys::OpenMode::Read);
         std::vector<FileSys::VirtualFile> concat;
 
         for (u32 i = 0; i < 0x10; ++i) {
@@ -127,10 +127,10 @@ FileSys::VirtualFile GetGameFileFromPath(const FileSys::VirtualFilesystem& vfs,
     }
 
     if (Common::FS::IsDir(path)) {
-        return vfs->OpenFile(path + "/main", FileSys::Mode::Read);
+        return vfs->OpenFile(path + "/main", FileSys::OpenMode::Read);
     }
 
-    return vfs->OpenFile(path, FileSys::Mode::Read);
+    return vfs->OpenFile(path, FileSys::OpenMode::Read);
 }
 
 struct System::Impl {
diff --git a/src/core/core.h b/src/core/core.h
index 183410602..d8862e9ce 100644
--- a/src/core/core.h
+++ b/src/core/core.h
@@ -13,7 +13,7 @@
 #include <vector>
 
 #include "common/common_types.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace Core::Frontend {
 class EmuWindow;
diff --git a/src/core/crypto/aes_util.h b/src/core/crypto/aes_util.h
index a67ba5352..c2fd587a7 100644
--- a/src/core/crypto/aes_util.h
+++ b/src/core/crypto/aes_util.h
@@ -7,7 +7,7 @@
 #include <span>
 #include <type_traits>
 #include "common/common_types.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Core::Crypto {
 
diff --git a/src/core/crypto/encryption_layer.h b/src/core/crypto/encryption_layer.h
index d3082ba53..b53f0b12e 100644
--- a/src/core/crypto/encryption_layer.h
+++ b/src/core/crypto/encryption_layer.h
@@ -4,7 +4,7 @@
 #pragma once
 
 #include "common/common_types.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Core::Crypto {
 
diff --git a/src/core/crypto/partition_data_manager.cpp b/src/core/crypto/partition_data_manager.cpp
index 97f5c8cea..4b45e72c4 100644
--- a/src/core/crypto/partition_data_manager.cpp
+++ b/src/core/crypto/partition_data_manager.cpp
@@ -21,9 +21,9 @@
 #include "core/crypto/partition_data_manager.h"
 #include "core/crypto/xts_encryption_layer.h"
 #include "core/file_sys/kernel_executable.h"
-#include "core/file_sys/vfs.h"
-#include "core/file_sys/vfs_offset.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs.h"
+#include "core/file_sys/vfs/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 #include "core/loader/loader.h"
 
 using Common::AsArray;
diff --git a/src/core/crypto/partition_data_manager.h b/src/core/crypto/partition_data_manager.h
index 057a70683..4354a21e6 100644
--- a/src/core/crypto/partition_data_manager.h
+++ b/src/core/crypto/partition_data_manager.h
@@ -5,7 +5,7 @@
 
 #include <vector>
 #include "common/common_types.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace Core::Crypto {
 
diff --git a/src/core/file_sys/bis_factory.cpp b/src/core/file_sys/bis_factory.cpp
index c750c0da7..db667438e 100644
--- a/src/core/file_sys/bis_factory.cpp
+++ b/src/core/file_sys/bis_factory.cpp
@@ -4,9 +4,8 @@
 #include <fmt/format.h>
 #include "common/fs/path_util.h"
 #include "core/file_sys/bis_factory.h"
-#include "core/file_sys/mode.h"
 #include "core/file_sys/registered_cache.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
@@ -84,7 +83,7 @@ VirtualFile BISFactory::OpenPartitionStorage(BisPartitionId id,
                                              VirtualFilesystem file_system) const {
     auto& keys = Core::Crypto::KeyManager::Instance();
     Core::Crypto::PartitionDataManager pdm{file_system->OpenDirectory(
-        Common::FS::GetYuzuPathString(Common::FS::YuzuPath::NANDDir), Mode::Read)};
+        Common::FS::GetYuzuPathString(Common::FS::YuzuPath::NANDDir), OpenMode::Read)};
     keys.PopulateFromPartitionData(pdm);
 
     switch (id) {
diff --git a/src/core/file_sys/bis_factory.h b/src/core/file_sys/bis_factory.h
index 26f0c6e5e..23680b60c 100644
--- a/src/core/file_sys/bis_factory.h
+++ b/src/core/file_sys/bis_factory.h
@@ -6,7 +6,7 @@
 #include <memory>
 
 #include "common/common_types.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/card_image.cpp b/src/core/file_sys/card_image.cpp
index 8b9a4fc5a..0bcf40cf8 100644
--- a/src/core/file_sys/card_image.cpp
+++ b/src/core/file_sys/card_image.cpp
@@ -13,8 +13,8 @@
 #include "core/file_sys/nca_metadata.h"
 #include "core/file_sys/partition_filesystem.h"
 #include "core/file_sys/submission_package.h"
-#include "core/file_sys/vfs_offset.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 #include "core/loader/loader.h"
 
 namespace FileSys {
diff --git a/src/core/file_sys/card_image.h b/src/core/file_sys/card_image.h
index 9886123e7..97871da4a 100644
--- a/src/core/file_sys/card_image.h
+++ b/src/core/file_sys/card_image.h
@@ -8,7 +8,7 @@
 #include <vector>
 #include "common/common_types.h"
 #include "common/swap.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Core::Crypto {
 class KeyManager;
diff --git a/src/core/file_sys/content_archive.cpp b/src/core/file_sys/content_archive.cpp
index 7d2f0abb8..285fe4db6 100644
--- a/src/core/file_sys/content_archive.cpp
+++ b/src/core/file_sys/content_archive.cpp
@@ -13,7 +13,7 @@
 #include "core/crypto/key_manager.h"
 #include "core/file_sys/content_archive.h"
 #include "core/file_sys/partition_filesystem.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 #include "core/loader/loader.h"
 
 #include "core/file_sys/fssystem/fssystem_compression_configuration.h"
diff --git a/src/core/file_sys/content_archive.h b/src/core/file_sys/content_archive.h
index af521d453..f68464eb0 100644
--- a/src/core/file_sys/content_archive.h
+++ b/src/core/file_sys/content_archive.h
@@ -13,7 +13,7 @@
 #include "common/common_types.h"
 #include "common/swap.h"
 #include "core/crypto/key_manager.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Loader {
 enum class ResultStatus : u16;
diff --git a/src/core/file_sys/control_metadata.cpp b/src/core/file_sys/control_metadata.cpp
index 0697c29ae..f98594335 100644
--- a/src/core/file_sys/control_metadata.cpp
+++ b/src/core/file_sys/control_metadata.cpp
@@ -5,7 +5,7 @@
 #include "common/string_util.h"
 #include "common/swap.h"
 #include "core/file_sys/control_metadata.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/control_metadata.h b/src/core/file_sys/control_metadata.h
index c98efb00d..555b9d8f7 100644
--- a/src/core/file_sys/control_metadata.h
+++ b/src/core/file_sys/control_metadata.h
@@ -8,7 +8,7 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "common/swap.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/directory.h b/src/core/file_sys/directory.h
deleted file mode 100644
index a853c00f3..000000000
--- a/src/core/file_sys/directory.h
+++ /dev/null
@@ -1,39 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#pragma once
-
-#include <cstddef>
-#include "common/common_funcs.h"
-#include "common/common_types.h"
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-// FileSys namespace
-
-namespace FileSys {
-
-enum class EntryType : u8 {
-    Directory = 0,
-    File = 1,
-};
-
-// Structure of a directory entry, from
-// http://switchbrew.org/index.php?title=Filesystem_services#DirectoryEntry
-struct Entry {
-    Entry(std::string_view view, EntryType entry_type, u64 entry_size)
-        : type{entry_type}, file_size{entry_size} {
-        const std::size_t copy_size = view.copy(filename, std::size(filename) - 1);
-        filename[copy_size] = '\0';
-    }
-
-    char filename[0x301];
-    INSERT_PADDING_BYTES(3);
-    EntryType type;
-    INSERT_PADDING_BYTES(3);
-    u64 file_size;
-};
-static_assert(sizeof(Entry) == 0x310, "Directory Entry struct isn't exactly 0x310 bytes long!");
-static_assert(offsetof(Entry, type) == 0x304, "Wrong offset for type in Entry.");
-static_assert(offsetof(Entry, file_size) == 0x308, "Wrong offset for file_size in Entry.");
-
-} // namespace FileSys
diff --git a/src/core/file_sys/errors.h b/src/core/file_sys/errors.h
index 2f5045a67..d4e0eb6f4 100644
--- a/src/core/file_sys/errors.h
+++ b/src/core/file_sys/errors.h
@@ -7,18 +7,13 @@
 
 namespace FileSys {
 
-constexpr Result ERROR_PATH_NOT_FOUND{ErrorModule::FS, 1};
-constexpr Result ERROR_PATH_ALREADY_EXISTS{ErrorModule::FS, 2};
-constexpr Result ERROR_ENTITY_NOT_FOUND{ErrorModule::FS, 1002};
-constexpr Result ERROR_SD_CARD_NOT_FOUND{ErrorModule::FS, 2001};
-constexpr Result ERROR_OUT_OF_BOUNDS{ErrorModule::FS, 3005};
-constexpr Result ERROR_FAILED_MOUNT_ARCHIVE{ErrorModule::FS, 3223};
-constexpr Result ERROR_INVALID_ARGUMENT{ErrorModule::FS, 6001};
-constexpr Result ERROR_INVALID_OFFSET{ErrorModule::FS, 6061};
-constexpr Result ERROR_INVALID_SIZE{ErrorModule::FS, 6062};
-
+constexpr Result ResultPathNotFound{ErrorModule::FS, 1};
+constexpr Result ResultPathAlreadyExists{ErrorModule::FS, 2};
 constexpr Result ResultUnsupportedSdkVersion{ErrorModule::FS, 50};
 constexpr Result ResultPartitionNotFound{ErrorModule::FS, 1001};
+constexpr Result ResultTargetNotFound{ErrorModule::FS, 1002};
+constexpr Result ResultPortSdCardNoDevice{ErrorModule::FS, 2001};
+constexpr Result ResultNotImplemented{ErrorModule::FS, 3001};
 constexpr Result ResultUnsupportedVersion{ErrorModule::FS, 3002};
 constexpr Result ResultOutOfRange{ErrorModule::FS, 3005};
 constexpr Result ResultAllocationMemoryFailedInFileSystemBuddyHeapA{ErrorModule::FS, 3294};
@@ -78,10 +73,21 @@ constexpr Result ResultUnexpectedInCompressedStorageA{ErrorModule::FS, 5324};
 constexpr Result ResultUnexpectedInCompressedStorageB{ErrorModule::FS, 5325};
 constexpr Result ResultUnexpectedInCompressedStorageC{ErrorModule::FS, 5326};
 constexpr Result ResultUnexpectedInCompressedStorageD{ErrorModule::FS, 5327};
+constexpr Result ResultUnexpectedInPathA{ErrorModule::FS, 5328};
 constexpr Result ResultInvalidArgument{ErrorModule::FS, 6001};
+constexpr Result ResultInvalidPath{ErrorModule::FS, 6002};
+constexpr Result ResultTooLongPath{ErrorModule::FS, 6003};
+constexpr Result ResultInvalidCharacter{ErrorModule::FS, 6004};
+constexpr Result ResultInvalidPathFormat{ErrorModule::FS, 6005};
+constexpr Result ResultDirectoryUnobtainable{ErrorModule::FS, 6006};
+constexpr Result ResultNotNormalized{ErrorModule::FS, 6007};
 constexpr Result ResultInvalidOffset{ErrorModule::FS, 6061};
 constexpr Result ResultInvalidSize{ErrorModule::FS, 6062};
 constexpr Result ResultNullptrArgument{ErrorModule::FS, 6063};
+constexpr Result ResultInvalidOpenMode{ErrorModule::FS, 6072};
+constexpr Result ResultFileExtensionWithoutOpenModeAllowAppend{ErrorModule::FS, 6201};
+constexpr Result ResultReadNotPermitted{ErrorModule::FS, 6202};
+constexpr Result ResultWriteNotPermitted{ErrorModule::FS, 6203};
 constexpr Result ResultUnsupportedSetSizeForIndirectStorage{ErrorModule::FS, 6325};
 constexpr Result ResultUnsupportedWriteForCompressedStorage{ErrorModule::FS, 6387};
 constexpr Result ResultUnsupportedOperateRangeForCompressedStorage{ErrorModule::FS, 6388};
diff --git a/src/core/file_sys/fs_directory.h b/src/core/file_sys/fs_directory.h
new file mode 100644
index 000000000..25c9cb18a
--- /dev/null
+++ b/src/core/file_sys/fs_directory.h
@@ -0,0 +1,33 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+namespace FileSys {
+
+constexpr inline size_t EntryNameLengthMax = 0x300;
+
+struct DirectoryEntry {
+    DirectoryEntry(std::string_view view, s8 entry_type, u64 entry_size)
+        : type{entry_type}, file_size{static_cast<s64>(entry_size)} {
+        const std::size_t copy_size = view.copy(name, std::size(name) - 1);
+        name[copy_size] = '\0';
+    }
+
+    char name[EntryNameLengthMax + 1];
+    INSERT_PADDING_BYTES(3);
+    s8 type;
+    INSERT_PADDING_BYTES(3);
+    s64 file_size;
+};
+
+static_assert(sizeof(DirectoryEntry) == 0x310,
+              "Directory Entry struct isn't exactly 0x310 bytes long!");
+static_assert(offsetof(DirectoryEntry, type) == 0x304, "Wrong offset for type in Entry.");
+static_assert(offsetof(DirectoryEntry, file_size) == 0x308, "Wrong offset for file_size in Entry.");
+
+struct DirectoryHandle {
+    void* handle;
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/fs_file.h b/src/core/file_sys/fs_file.h
new file mode 100644
index 000000000..4fb77e8db
--- /dev/null
+++ b/src/core/file_sys/fs_file.h
@@ -0,0 +1,65 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace FileSys {
+
+struct ReadOption {
+    u32 value;
+
+    static const ReadOption None;
+};
+
+enum ReadOptionFlag : u32 {
+    ReadOptionFlag_None = (0 << 0),
+};
+
+inline constexpr const ReadOption ReadOption::None = {ReadOptionFlag_None};
+
+inline constexpr bool operator==(const ReadOption& lhs, const ReadOption& rhs) {
+    return lhs.value == rhs.value;
+}
+
+inline constexpr bool operator!=(const ReadOption& lhs, const ReadOption& rhs) {
+    return !(lhs == rhs);
+}
+
+static_assert(sizeof(ReadOption) == sizeof(u32));
+
+enum WriteOptionFlag : u32 {
+    WriteOptionFlag_None = (0 << 0),
+    WriteOptionFlag_Flush = (1 << 0),
+};
+
+struct WriteOption {
+    u32 value;
+
+    constexpr inline bool HasFlushFlag() const {
+        return value & WriteOptionFlag_Flush;
+    }
+
+    static const WriteOption None;
+    static const WriteOption Flush;
+};
+
+inline constexpr const WriteOption WriteOption::None = {WriteOptionFlag_None};
+inline constexpr const WriteOption WriteOption::Flush = {WriteOptionFlag_Flush};
+
+inline constexpr bool operator==(const WriteOption& lhs, const WriteOption& rhs) {
+    return lhs.value == rhs.value;
+}
+
+inline constexpr bool operator!=(const WriteOption& lhs, const WriteOption& rhs) {
+    return !(lhs == rhs);
+}
+
+static_assert(sizeof(WriteOption) == sizeof(u32));
+
+struct FileHandle {
+    void* handle;
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/fs_filesystem.h b/src/core/file_sys/fs_filesystem.h
new file mode 100644
index 000000000..7f237b7fa
--- /dev/null
+++ b/src/core/file_sys/fs_filesystem.h
@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+
+namespace FileSys {
+
+enum class OpenMode : u32 {
+    Read = (1 << 0),
+    Write = (1 << 1),
+    AllowAppend = (1 << 2),
+
+    ReadWrite = (Read | Write),
+    All = (ReadWrite | AllowAppend),
+};
+DECLARE_ENUM_FLAG_OPERATORS(OpenMode)
+
+enum class OpenDirectoryMode : u64 {
+    Directory = (1 << 0),
+    File = (1 << 1),
+
+    All = (Directory | File),
+};
+DECLARE_ENUM_FLAG_OPERATORS(OpenDirectoryMode)
+
+enum class DirectoryEntryType : u8 {
+    Directory = 0,
+    File = 1,
+};
+
+enum class CreateOption : u8 {
+    None = (0 << 0),
+    BigFile = (1 << 0),
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/fs_memory_management.h b/src/core/file_sys/fs_memory_management.h
new file mode 100644
index 000000000..f03c6354b
--- /dev/null
+++ b/src/core/file_sys/fs_memory_management.h
@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <mutex>
+#include "common/alignment.h"
+
+namespace FileSys {
+
+constexpr size_t RequiredAlignment = alignof(u64);
+
+void* AllocateUnsafe(size_t size) {
+    // Allocate
+    void* const ptr = ::operator new(size, std::align_val_t{RequiredAlignment});
+
+    // Check alignment
+    ASSERT(Common::IsAligned(reinterpret_cast<uintptr_t>(ptr), RequiredAlignment));
+
+    // Return allocated pointer
+    return ptr;
+}
+
+void DeallocateUnsafe(void* ptr, size_t size) {
+    // Deallocate the pointer
+    ::operator delete(ptr, std::align_val_t{RequiredAlignment});
+}
+
+void* Allocate(size_t size) {
+    return AllocateUnsafe(size);
+}
+
+void Deallocate(void* ptr, size_t size) {
+    // If the pointer is non-null, deallocate it
+    if (ptr != nullptr) {
+        DeallocateUnsafe(ptr, size);
+    }
+}
+
+} // namespace FileSys
diff --git a/src/core/file_sys/fs_operate_range.h b/src/core/file_sys/fs_operate_range.h
new file mode 100644
index 000000000..04ea64cc0
--- /dev/null
+++ b/src/core/file_sys/fs_operate_range.h
@@ -0,0 +1,22 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace FileSys {
+
+enum class OperationId : s64 {
+    FillZero = 0,
+    DestroySignature = 1,
+    Invalidate = 2,
+    QueryRange = 3,
+    QueryUnpreparedRange = 4,
+    QueryLazyLoadCompletionRate = 5,
+    SetLazyLoadPriority = 6,
+
+    ReadLazyLoadFileForciblyForDebug = 10001,
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/fs_path.h b/src/core/file_sys/fs_path.h
new file mode 100644
index 000000000..56ba08a6a
--- /dev/null
+++ b/src/core/file_sys/fs_path.h
@@ -0,0 +1,566 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/alignment.h"
+#include "common/common_funcs.h"
+#include "core/file_sys/errors.h"
+#include "core/file_sys/fs_memory_management.h"
+#include "core/file_sys/fs_path_utility.h"
+#include "core/file_sys/fs_string_util.h"
+#include "core/hle/result.h"
+
+namespace FileSys {
+class DirectoryPathParser;
+
+class Path {
+    YUZU_NON_COPYABLE(Path);
+    YUZU_NON_MOVEABLE(Path);
+
+private:
+    static constexpr const char* EmptyPath = "";
+    static constexpr size_t WriteBufferAlignmentLength = 8;
+
+private:
+    friend class DirectoryPathParser;
+
+public:
+    class WriteBuffer {
+        YUZU_NON_COPYABLE(WriteBuffer);
+
+    private:
+        char* m_buffer;
+        size_t m_length_and_is_normalized;
+
+    public:
+        constexpr WriteBuffer() : m_buffer(nullptr), m_length_and_is_normalized(0) {}
+
+        constexpr ~WriteBuffer() {
+            if (m_buffer != nullptr) {
+                Deallocate(m_buffer, this->GetLength());
+                this->ResetBuffer();
+            }
+        }
+
+        constexpr WriteBuffer(WriteBuffer&& rhs)
+            : m_buffer(rhs.m_buffer), m_length_and_is_normalized(rhs.m_length_and_is_normalized) {
+            rhs.ResetBuffer();
+        }
+
+        constexpr WriteBuffer& operator=(WriteBuffer&& rhs) {
+            if (m_buffer != nullptr) {
+                Deallocate(m_buffer, this->GetLength());
+            }
+
+            m_buffer = rhs.m_buffer;
+            m_length_and_is_normalized = rhs.m_length_and_is_normalized;
+
+            rhs.ResetBuffer();
+
+            return *this;
+        }
+
+        constexpr void ResetBuffer() {
+            m_buffer = nullptr;
+            this->SetLength(0);
+        }
+
+        constexpr char* Get() const {
+            return m_buffer;
+        }
+
+        constexpr size_t GetLength() const {
+            return m_length_and_is_normalized >> 1;
+        }
+
+        constexpr bool IsNormalized() const {
+            return static_cast<bool>(m_length_and_is_normalized & 1);
+        }
+
+        constexpr void SetNormalized() {
+            m_length_and_is_normalized |= static_cast<size_t>(1);
+        }
+
+        constexpr void SetNotNormalized() {
+            m_length_and_is_normalized &= ~static_cast<size_t>(1);
+        }
+
+    private:
+        constexpr WriteBuffer(char* buffer, size_t length)
+            : m_buffer(buffer), m_length_and_is_normalized(0) {
+            this->SetLength(length);
+        }
+
+    public:
+        static WriteBuffer Make(size_t length) {
+            if (void* alloc = Allocate(length); alloc != nullptr) {
+                return WriteBuffer(static_cast<char*>(alloc), length);
+            } else {
+                return WriteBuffer();
+            }
+        }
+
+    private:
+        constexpr void SetLength(size_t size) {
+            m_length_and_is_normalized = (m_length_and_is_normalized & 1) | (size << 1);
+        }
+    };
+
+private:
+    const char* m_str;
+    WriteBuffer m_write_buffer;
+
+public:
+    constexpr Path() : m_str(EmptyPath), m_write_buffer() {}
+
+    constexpr Path(const char* s) : m_str(s), m_write_buffer() {
+        m_write_buffer.SetNormalized();
+    }
+
+    constexpr ~Path() = default;
+
+    constexpr Result SetShallowBuffer(const char* buffer) {
+        // Check pre-conditions
+        ASSERT(m_write_buffer.GetLength() == 0);
+
+        // Check the buffer is valid
+        R_UNLESS(buffer != nullptr, ResultNullptrArgument);
+
+        // Set buffer
+        this->SetReadOnlyBuffer(buffer);
+
+        // Note that we're normalized
+        this->SetNormalized();
+
+        R_SUCCEED();
+    }
+
+    constexpr const char* GetString() const {
+        // Check pre-conditions
+        ASSERT(this->IsNormalized());
+
+        return m_str;
+    }
+
+    constexpr size_t GetLength() const {
+        if (std::is_constant_evaluated()) {
+            return Strlen(this->GetString());
+        } else {
+            return std::strlen(this->GetString());
+        }
+    }
+
+    constexpr bool IsEmpty() const {
+        return *m_str == '\x00';
+    }
+
+    constexpr bool IsMatchHead(const char* p, size_t len) const {
+        return Strncmp(this->GetString(), p, len) == 0;
+    }
+
+    Result Initialize(const Path& rhs) {
+        // Check the other path is normalized
+        const bool normalized = rhs.IsNormalized();
+        R_UNLESS(normalized, ResultNotNormalized);
+
+        // Allocate buffer for our path
+        const auto len = rhs.GetLength();
+        R_TRY(this->Preallocate(len + 1));
+
+        // Copy the path
+        const size_t copied = Strlcpy<char>(m_write_buffer.Get(), rhs.GetString(), len + 1);
+        R_UNLESS(copied == len, ResultUnexpectedInPathA);
+
+        // Set normalized
+        this->SetNormalized();
+        R_SUCCEED();
+    }
+
+    Result Initialize(const char* path, size_t len) {
+        // Check the path is valid
+        R_UNLESS(path != nullptr, ResultNullptrArgument);
+
+        // Initialize
+        R_TRY(this->InitializeImpl(path, len));
+
+        // Set not normalized
+        this->SetNotNormalized();
+
+        R_SUCCEED();
+    }
+
+    Result Initialize(const char* path) {
+        // Check the path is valid
+        R_UNLESS(path != nullptr, ResultNullptrArgument);
+
+        R_RETURN(this->Initialize(path, std::strlen(path)));
+    }
+
+    Result InitializeWithReplaceBackslash(const char* path) {
+        // Check the path is valid
+        R_UNLESS(path != nullptr, ResultNullptrArgument);
+
+        // Initialize
+        R_TRY(this->InitializeImpl(path, std::strlen(path)));
+
+        // Replace slashes as desired
+        if (const auto write_buffer_length = m_write_buffer.GetLength(); write_buffer_length > 1) {
+            Replace(m_write_buffer.Get(), write_buffer_length - 1, '\\', '/');
+        }
+
+        // Set not normalized
+        this->SetNotNormalized();
+
+        R_SUCCEED();
+    }
+
+    Result InitializeWithReplaceForwardSlashes(const char* path) {
+        // Check the path is valid
+        R_UNLESS(path != nullptr, ResultNullptrArgument);
+
+        // Initialize
+        R_TRY(this->InitializeImpl(path, std::strlen(path)));
+
+        // Replace slashes as desired
+        if (m_write_buffer.GetLength() > 1) {
+            if (auto* p = m_write_buffer.Get(); p[0] == '/' && p[1] == '/') {
+                p[0] = '\\';
+                p[1] = '\\';
+            }
+        }
+
+        // Set not normalized
+        this->SetNotNormalized();
+
+        R_SUCCEED();
+    }
+
+    Result InitializeWithNormalization(const char* path, size_t size) {
+        // Check the path is valid
+        R_UNLESS(path != nullptr, ResultNullptrArgument);
+
+        // Initialize
+        R_TRY(this->InitializeImpl(path, size));
+
+        // Set not normalized
+        this->SetNotNormalized();
+
+        // Perform normalization
+        PathFlags path_flags;
+        if (IsPathRelative(m_str)) {
+            path_flags.AllowRelativePath();
+        } else if (IsWindowsPath(m_str, true)) {
+            path_flags.AllowWindowsPath();
+        } else {
+            /* NOTE: In this case, Nintendo checks is normalized, then sets is normalized, then
+             * returns success. */
+            /* This seems like a bug. */
+            size_t dummy;
+            bool normalized;
+            R_TRY(PathFormatter::IsNormalized(std::addressof(normalized), std::addressof(dummy),
+                                              m_str));
+
+            this->SetNormalized();
+            R_SUCCEED();
+        }
+
+        // Normalize
+        R_TRY(this->Normalize(path_flags));
+
+        this->SetNormalized();
+        R_SUCCEED();
+    }
+
+    Result InitializeWithNormalization(const char* path) {
+        // Check the path is valid
+        R_UNLESS(path != nullptr, ResultNullptrArgument);
+
+        R_RETURN(this->InitializeWithNormalization(path, std::strlen(path)));
+    }
+
+    Result InitializeAsEmpty() {
+        // Clear our buffer
+        this->ClearBuffer();
+
+        // Set normalized
+        this->SetNormalized();
+
+        R_SUCCEED();
+    }
+
+    Result AppendChild(const char* child) {
+        // Check the path is valid
+        R_UNLESS(child != nullptr, ResultNullptrArgument);
+
+        // Basic checks. If we have a path and the child is empty, we have nothing to do
+        const char* c = child;
+        if (m_str[0]) {
+            // Skip an early separator
+            if (*c == '/') {
+                ++c;
+            }
+
+            R_SUCCEED_IF(*c == '\x00');
+        }
+
+        // If we don't have a string, we can just initialize
+        auto cur_len = std::strlen(m_str);
+        if (cur_len == 0) {
+            R_RETURN(this->Initialize(child));
+        }
+
+        // Remove a trailing separator
+        if (m_str[cur_len - 1] == '/' || m_str[cur_len - 1] == '\\') {
+            --cur_len;
+        }
+
+        // Get the child path's length
+        auto child_len = std::strlen(c);
+
+        // Reset our write buffer
+        WriteBuffer old_write_buffer;
+        if (m_write_buffer.Get() != nullptr) {
+            old_write_buffer = std::move(m_write_buffer);
+            this->ClearBuffer();
+        }
+
+        // Pre-allocate the new buffer
+        R_TRY(this->Preallocate(cur_len + 1 + child_len + 1));
+
+        // Get our write buffer
+        auto* dst = m_write_buffer.Get();
+        if (old_write_buffer.Get() != nullptr && cur_len > 0) {
+            Strlcpy<char>(dst, old_write_buffer.Get(), cur_len + 1);
+        }
+
+        // Add separator
+        dst[cur_len] = '/';
+
+        // Copy the child path
+        const size_t copied = Strlcpy<char>(dst + cur_len + 1, c, child_len + 1);
+        R_UNLESS(copied == child_len, ResultUnexpectedInPathA);
+
+        R_SUCCEED();
+    }
+
+    Result AppendChild(const Path& rhs) {
+        R_RETURN(this->AppendChild(rhs.GetString()));
+    }
+
+    Result Combine(const Path& parent, const Path& child) {
+        // Get the lengths
+        const auto p_len = parent.GetLength();
+        const auto c_len = child.GetLength();
+
+        // Allocate our buffer
+        R_TRY(this->Preallocate(p_len + c_len + 1));
+
+        // Initialize as parent
+        R_TRY(this->Initialize(parent));
+
+        // If we're empty, we can just initialize as child
+        if (this->IsEmpty()) {
+            R_TRY(this->Initialize(child));
+        } else {
+            // Otherwise, we should append the child
+            R_TRY(this->AppendChild(child));
+        }
+
+        R_SUCCEED();
+    }
+
+    Result RemoveChild() {
+        // If we don't have a write-buffer, ensure that we have one
+        if (m_write_buffer.Get() == nullptr) {
+            if (const auto len = std::strlen(m_str); len > 0) {
+                R_TRY(this->Preallocate(len));
+                Strlcpy<char>(m_write_buffer.Get(), m_str, len + 1);
+            }
+        }
+
+        // Check that it's possible for us to remove a child
+        auto* p = m_write_buffer.Get();
+        s32 len = std::strlen(p);
+        R_UNLESS(len != 1 || (p[0] != '/' && p[0] != '.'), ResultNotImplemented);
+
+        // Handle a trailing separator
+        if (len > 0 && (p[len - 1] == '\\' || p[len - 1] == '/')) {
+            --len;
+        }
+
+        // Remove the child path segment
+        while ((--len) >= 0 && p[len]) {
+            if (p[len] == '/' || p[len] == '\\') {
+                if (len > 0) {
+                    p[len] = 0;
+                } else {
+                    p[1] = 0;
+                    len = 1;
+                }
+                break;
+            }
+        }
+
+        // Check that length remains > 0
+        R_UNLESS(len > 0, ResultNotImplemented);
+
+        R_SUCCEED();
+    }
+
+    Result Normalize(const PathFlags& flags) {
+        // If we're already normalized, nothing to do
+        R_SUCCEED_IF(this->IsNormalized());
+
+        // Check if we're normalized
+        bool normalized;
+        size_t dummy;
+        R_TRY(PathFormatter::IsNormalized(std::addressof(normalized), std::addressof(dummy), m_str,
+                                          flags));
+
+        // If we're not normalized, normalize
+        if (!normalized) {
+            // Determine necessary buffer length
+            auto len = m_write_buffer.GetLength();
+            if (flags.IsRelativePathAllowed() && IsPathRelative(m_str)) {
+                len += 2;
+            }
+            if (flags.IsWindowsPathAllowed() && IsWindowsPath(m_str, true)) {
+                len += 1;
+            }
+
+            // Allocate a new buffer
+            const size_t size = Common::AlignUp(len, WriteBufferAlignmentLength);
+            auto buf = WriteBuffer::Make(size);
+            R_UNLESS(buf.Get() != nullptr, ResultAllocationMemoryFailedMakeUnique);
+
+            // Normalize into it
+            R_TRY(PathFormatter::Normalize(buf.Get(), size, m_write_buffer.Get(),
+                                           m_write_buffer.GetLength(), flags));
+
+            // Set the normalized buffer as our buffer
+            this->SetModifiableBuffer(std::move(buf));
+        }
+
+        // Set normalized
+        this->SetNormalized();
+        R_SUCCEED();
+    }
+
+private:
+    void ClearBuffer() {
+        m_write_buffer.ResetBuffer();
+        m_str = EmptyPath;
+    }
+
+    void SetModifiableBuffer(WriteBuffer&& buffer) {
+        // Check pre-conditions
+        ASSERT(buffer.Get() != nullptr);
+        ASSERT(buffer.GetLength() > 0);
+        ASSERT(Common::IsAligned(buffer.GetLength(), WriteBufferAlignmentLength));
+
+        // Get whether we're normalized
+        if (m_write_buffer.IsNormalized()) {
+            buffer.SetNormalized();
+        } else {
+            buffer.SetNotNormalized();
+        }
+
+        // Set write buffer
+        m_write_buffer = std::move(buffer);
+        m_str = m_write_buffer.Get();
+    }
+
+    constexpr void SetReadOnlyBuffer(const char* buffer) {
+        m_str = buffer;
+        m_write_buffer.ResetBuffer();
+    }
+
+    Result Preallocate(size_t length) {
+        // Allocate additional space, if needed
+        if (length > m_write_buffer.GetLength()) {
+            // Allocate buffer
+            const size_t size = Common::AlignUp(length, WriteBufferAlignmentLength);
+            auto buf = WriteBuffer::Make(size);
+            R_UNLESS(buf.Get() != nullptr, ResultAllocationMemoryFailedMakeUnique);
+
+            // Set write buffer
+            this->SetModifiableBuffer(std::move(buf));
+        }
+
+        R_SUCCEED();
+    }
+
+    Result InitializeImpl(const char* path, size_t size) {
+        if (size > 0 && path[0]) {
+            // Pre allocate a buffer for the path
+            R_TRY(this->Preallocate(size + 1));
+
+            // Copy the path
+            const size_t copied = Strlcpy<char>(m_write_buffer.Get(), path, size + 1);
+            R_UNLESS(copied >= size, ResultUnexpectedInPathA);
+        } else {
+            // We can just clear the buffer
+            this->ClearBuffer();
+        }
+
+        R_SUCCEED();
+    }
+
+    constexpr char* GetWriteBuffer() {
+        ASSERT(m_write_buffer.Get() != nullptr);
+        return m_write_buffer.Get();
+    }
+
+    constexpr size_t GetWriteBufferLength() const {
+        return m_write_buffer.GetLength();
+    }
+
+    constexpr bool IsNormalized() const {
+        return m_write_buffer.IsNormalized();
+    }
+
+    constexpr void SetNormalized() {
+        m_write_buffer.SetNormalized();
+    }
+
+    constexpr void SetNotNormalized() {
+        m_write_buffer.SetNotNormalized();
+    }
+
+public:
+    bool operator==(const FileSys::Path& rhs) const {
+        return std::strcmp(this->GetString(), rhs.GetString()) == 0;
+    }
+    bool operator!=(const FileSys::Path& rhs) const {
+        return !(*this == rhs);
+    }
+    bool operator==(const char* p) const {
+        return std::strcmp(this->GetString(), p) == 0;
+    }
+    bool operator!=(const char* p) const {
+        return !(*this == p);
+    }
+};
+
+inline Result SetUpFixedPath(FileSys::Path* out, const char* s) {
+    // Verify the path is normalized
+    bool normalized;
+    size_t dummy;
+    R_TRY(PathNormalizer::IsNormalized(std::addressof(normalized), std::addressof(dummy), s));
+
+    R_UNLESS(normalized, ResultInvalidPathFormat);
+
+    // Set the fixed path
+    R_RETURN(out->SetShallowBuffer(s));
+}
+
+constexpr inline bool IsWindowsDriveRootPath(const FileSys::Path& path) {
+    const char* const str = path.GetString();
+    return IsWindowsDrive(str) &&
+           (str[2] == StringTraits::DirectorySeparator ||
+            str[2] == StringTraits::AlternateDirectorySeparator) &&
+           str[3] == StringTraits::NullTerminator;
+}
+
+} // namespace FileSys
diff --git a/src/core/file_sys/fs_path_utility.h b/src/core/file_sys/fs_path_utility.h
new file mode 100644
index 000000000..e9011d065
--- /dev/null
+++ b/src/core/file_sys/fs_path_utility.h
@@ -0,0 +1,1239 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/assert.h"
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "common/scope_exit.h"
+#include "core/file_sys/fs_directory.h"
+#include "core/file_sys/fs_memory_management.h"
+#include "core/file_sys/fs_string_util.h"
+#include "core/hle/result.h"
+
+namespace FileSys {
+
+constexpr inline size_t MountNameLengthMax = 15;
+
+namespace StringTraits {
+
+constexpr inline char DirectorySeparator = '/';
+constexpr inline char DriveSeparator = ':';
+constexpr inline char Dot = '.';
+constexpr inline char NullTerminator = '\x00';
+
+constexpr inline char AlternateDirectorySeparator = '\\';
+
+constexpr inline const char InvalidCharacters[6] = {':', '*', '?', '<', '>', '|'};
+constexpr inline const char InvalidCharactersForHostName[6] = {':', '*', '<', '>', '|', '$'};
+constexpr inline const char InvalidCharactersForMountName[5] = {'*', '?', '<', '>', '|'};
+
+namespace impl {
+
+template <const char* InvalidCharacterSet, size_t NumInvalidCharacters>
+consteval u64 MakeInvalidCharacterMask(size_t n) {
+    u64 mask = 0;
+    for (size_t i = 0; i < NumInvalidCharacters; ++i) {
+        if ((static_cast<u64>(InvalidCharacterSet[i]) >> 6) == n) {
+            mask |= static_cast<u64>(1) << (static_cast<u64>(InvalidCharacterSet[i]) & 0x3F);
+        }
+    }
+    return mask;
+}
+
+template <const char* InvalidCharacterSet, size_t NumInvalidCharacters>
+constexpr bool IsInvalidCharacterImpl(char c) {
+    constexpr u64 Masks[4] = {
+        MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(0),
+        MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(1),
+        MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(2),
+        MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(3)};
+
+    return (Masks[static_cast<u64>(c) >> 6] &
+            (static_cast<u64>(1) << (static_cast<u64>(c) & 0x3F))) != 0;
+}
+
+} // namespace impl
+
+constexpr bool IsInvalidCharacter(char c) {
+    return impl::IsInvalidCharacterImpl<InvalidCharacters, Common::Size(InvalidCharacters)>(c);
+}
+constexpr bool IsInvalidCharacterForHostName(char c) {
+    return impl::IsInvalidCharacterImpl<InvalidCharactersForHostName,
+                                        Common::Size(InvalidCharactersForHostName)>(c);
+}
+constexpr bool IsInvalidCharacterForMountName(char c) {
+    return impl::IsInvalidCharacterImpl<InvalidCharactersForMountName,
+                                        Common::Size(InvalidCharactersForMountName)>(c);
+}
+
+} // namespace StringTraits
+
+constexpr inline size_t WindowsDriveLength = 2;
+constexpr inline size_t UncPathPrefixLength = 2;
+constexpr inline size_t DosDevicePathPrefixLength = 4;
+
+class PathFlags {
+private:
+    static constexpr u32 WindowsPathFlag = (1 << 0);
+    static constexpr u32 RelativePathFlag = (1 << 1);
+    static constexpr u32 EmptyPathFlag = (1 << 2);
+    static constexpr u32 MountNameFlag = (1 << 3);
+    static constexpr u32 BackslashFlag = (1 << 4);
+    static constexpr u32 AllCharactersFlag = (1 << 5);
+
+private:
+    u32 m_value;
+
+public:
+    constexpr PathFlags() : m_value(0) { /* ... */
+    }
+
+#define DECLARE_PATH_FLAG_HANDLER(__WHICH__)                                                       \
+    constexpr bool Is##__WHICH__##Allowed() const { return (m_value & __WHICH__##Flag) != 0; }     \
+    constexpr void Allow##__WHICH__() { m_value |= __WHICH__##Flag; }
+
+    DECLARE_PATH_FLAG_HANDLER(WindowsPath)
+    DECLARE_PATH_FLAG_HANDLER(RelativePath)
+    DECLARE_PATH_FLAG_HANDLER(EmptyPath)
+    DECLARE_PATH_FLAG_HANDLER(MountName)
+    DECLARE_PATH_FLAG_HANDLER(Backslash)
+    DECLARE_PATH_FLAG_HANDLER(AllCharacters)
+
+#undef DECLARE_PATH_FLAG_HANDLER
+};
+
+template <typename T>
+    requires(std::same_as<T, char> || std::same_as<T, wchar_t>)
+constexpr inline bool IsDosDevicePath(const T* path) {
+    ASSERT(path != nullptr);
+
+    using namespace StringTraits;
+
+    return path[0] == AlternateDirectorySeparator && path[1] == AlternateDirectorySeparator &&
+           (path[2] == Dot || path[2] == '?') &&
+           (path[3] == DirectorySeparator || path[3] == AlternateDirectorySeparator);
+}
+
+template <typename T>
+    requires(std::same_as<T, char> || std::same_as<T, wchar_t>)
+constexpr inline bool IsUncPath(const T* path, bool allow_forward_slash = true,
+                                bool allow_back_slash = true) {
+    ASSERT(path != nullptr);
+
+    using namespace StringTraits;
+
+    return (allow_forward_slash && path[0] == DirectorySeparator &&
+            path[1] == DirectorySeparator) ||
+           (allow_back_slash && path[0] == AlternateDirectorySeparator &&
+            path[1] == AlternateDirectorySeparator);
+}
+
+constexpr inline bool IsWindowsDrive(const char* path) {
+    ASSERT(path != nullptr);
+
+    return (('a' <= path[0] && path[0] <= 'z') || ('A' <= path[0] && path[0] <= 'Z')) &&
+           path[1] == StringTraits::DriveSeparator;
+}
+
+constexpr inline bool IsWindowsPath(const char* path, bool allow_forward_slash_unc) {
+    return IsWindowsDrive(path) || IsDosDevicePath(path) ||
+           IsUncPath(path, allow_forward_slash_unc, true);
+}
+
+constexpr inline int GetWindowsSkipLength(const char* path) {
+    if (IsDosDevicePath(path)) {
+        return DosDevicePathPrefixLength;
+    } else if (IsWindowsDrive(path)) {
+        return WindowsDriveLength;
+    } else if (IsUncPath(path)) {
+        return UncPathPrefixLength;
+    } else {
+        return 0;
+    }
+}
+
+constexpr inline bool IsPathAbsolute(const char* path) {
+    return IsWindowsPath(path, false) || path[0] == StringTraits::DirectorySeparator;
+}
+
+constexpr inline bool IsPathRelative(const char* path) {
+    return path[0] && !IsPathAbsolute(path);
+}
+
+constexpr inline bool IsCurrentDirectory(const char* path) {
+    return path[0] == StringTraits::Dot &&
+           (path[1] == StringTraits::NullTerminator || path[1] == StringTraits::DirectorySeparator);
+}
+
+constexpr inline bool IsParentDirectory(const char* path) {
+    return path[0] == StringTraits::Dot && path[1] == StringTraits::Dot &&
+           (path[2] == StringTraits::NullTerminator || path[2] == StringTraits::DirectorySeparator);
+}
+
+constexpr inline bool IsPathStartWithCurrentDirectory(const char* path) {
+    return IsCurrentDirectory(path) || IsParentDirectory(path);
+}
+
+constexpr inline bool IsSubPath(const char* lhs, const char* rhs) {
+    // Check pre-conditions
+    ASSERT(lhs != nullptr);
+    ASSERT(rhs != nullptr);
+
+    // Import StringTraits names for current scope
+    using namespace StringTraits;
+
+    // Special case certain paths
+    if (IsUncPath(lhs) && !IsUncPath(rhs)) {
+        return false;
+    }
+    if (!IsUncPath(lhs) && IsUncPath(rhs)) {
+        return false;
+    }
+
+    if (lhs[0] == DirectorySeparator && lhs[1] == NullTerminator && rhs[0] == DirectorySeparator &&
+        rhs[1] != NullTerminator) {
+        return true;
+    }
+    if (rhs[0] == DirectorySeparator && rhs[1] == NullTerminator && lhs[0] == DirectorySeparator &&
+        lhs[1] != NullTerminator) {
+        return true;
+    }
+
+    // Check subpath
+    for (size_t i = 0; /* ... */; ++i) {
+        if (lhs[i] == NullTerminator) {
+            return rhs[i] == DirectorySeparator;
+        } else if (rhs[i] == NullTerminator) {
+            return lhs[i] == DirectorySeparator;
+        } else if (lhs[i] != rhs[i]) {
+            return false;
+        }
+    }
+}
+
+// Path utilities
+constexpr inline void Replace(char* dst, size_t dst_size, char old_char, char new_char) {
+    ASSERT(dst != nullptr);
+    for (char* cur = dst; cur < dst + dst_size && *cur; ++cur) {
+        if (*cur == old_char) {
+            *cur = new_char;
+        }
+    }
+}
+
+constexpr inline Result CheckUtf8(const char* s) {
+    // Check pre-conditions
+    ASSERT(s != nullptr);
+
+    // Iterate, checking for utf8-validity
+    while (*s) {
+        char utf8_buf[4] = {};
+
+        const auto pick_res = PickOutCharacterFromUtf8String(utf8_buf, std::addressof(s));
+        R_UNLESS(pick_res == CharacterEncodingResult_Success, ResultInvalidPathFormat);
+
+        u32 dummy;
+        const auto cvt_res = ConvertCharacterUtf8ToUtf32(std::addressof(dummy), utf8_buf);
+        R_UNLESS(cvt_res == CharacterEncodingResult_Success, ResultInvalidPathFormat);
+    }
+
+    R_SUCCEED();
+}
+
+// Path formatting
+class PathNormalizer {
+private:
+    enum class PathState {
+        Start,
+        Normal,
+        FirstSeparator,
+        Separator,
+        CurrentDir,
+        ParentDir,
+    };
+
+private:
+    static constexpr void ReplaceParentDirectoryPath(char* dst, const char* src) {
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Start with a dir-separator
+        dst[0] = DirectorySeparator;
+
+        auto i = 1;
+        while (src[i] != NullTerminator) {
+            if ((src[i - 1] == DirectorySeparator || src[i - 1] == AlternateDirectorySeparator) &&
+                src[i + 0] == Dot && src[i + 1] == Dot &&
+                (src[i + 2] == DirectorySeparator || src[i + 2] == AlternateDirectorySeparator)) {
+                dst[i - 1] = DirectorySeparator;
+                dst[i + 0] = Dot;
+                dst[i + 1] = Dot;
+                dst[i + 2] = DirectorySeparator;
+                i += 3;
+            } else {
+                if (src[i - 1] == AlternateDirectorySeparator && src[i + 0] == Dot &&
+                    src[i + 1] == Dot && src[i + 2] == NullTerminator) {
+                    dst[i - 1] = DirectorySeparator;
+                    dst[i + 0] = Dot;
+                    dst[i + 1] = Dot;
+                    i += 2;
+                    break;
+                }
+
+                dst[i] = src[i];
+                ++i;
+            }
+        }
+
+        dst[i] = StringTraits::NullTerminator;
+    }
+
+public:
+    static constexpr bool IsParentDirectoryPathReplacementNeeded(const char* path) {
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        if (path[0] != DirectorySeparator && path[0] != AlternateDirectorySeparator) {
+            return false;
+        }
+
+        // Check to find a parent reference using alternate separators
+        if (path[0] != NullTerminator && path[1] != NullTerminator && path[2] != NullTerminator) {
+            size_t i;
+            for (i = 0; path[i + 3] != NullTerminator; ++path) {
+                if (path[i + 1] != Dot || path[i + 2] != Dot) {
+                    continue;
+                }
+
+                const char c0 = path[i + 0];
+                const char c3 = path[i + 3];
+
+                if (c0 == AlternateDirectorySeparator &&
+                    (c3 == DirectorySeparator || c3 == AlternateDirectorySeparator ||
+                     c3 == NullTerminator)) {
+                    return true;
+                }
+
+                if (c3 == AlternateDirectorySeparator &&
+                    (c0 == DirectorySeparator || c0 == AlternateDirectorySeparator)) {
+                    return true;
+                }
+            }
+
+            if (path[i + 0] == AlternateDirectorySeparator && path[i + 1] == Dot &&
+                path[i + 2] == Dot /* && path[i + 3] == NullTerminator */) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    static constexpr Result IsNormalized(bool* out, size_t* out_len, const char* path,
+                                         bool allow_all_characters = false) {
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Parse the path
+        auto state = PathState::Start;
+        size_t len = 0;
+        while (path[len] != NullTerminator) {
+            // Get the current character
+            const char c = path[len++];
+
+            // Check the current character is valid
+            if (!allow_all_characters && state != PathState::Start) {
+                R_UNLESS(!IsInvalidCharacter(c), ResultInvalidCharacter);
+            }
+
+            // Process depending on current state
+            switch (state) {
+                // Import the PathState enums for convenience
+                using enum PathState;
+
+            case Start:
+                R_UNLESS(c == DirectorySeparator, ResultInvalidPathFormat);
+                state = FirstSeparator;
+                break;
+            case Normal:
+                if (c == DirectorySeparator) {
+                    state = Separator;
+                }
+                break;
+            case FirstSeparator:
+            case Separator:
+                if (c == DirectorySeparator) {
+                    *out = false;
+                    R_SUCCEED();
+                }
+
+                if (c == Dot) {
+                    state = CurrentDir;
+                } else {
+                    state = Normal;
+                }
+                break;
+            case CurrentDir:
+                if (c == DirectorySeparator) {
+                    *out = false;
+                    R_SUCCEED();
+                }
+
+                if (c == Dot) {
+                    state = ParentDir;
+                } else {
+                    state = Normal;
+                }
+                break;
+            case ParentDir:
+                if (c == DirectorySeparator) {
+                    *out = false;
+                    R_SUCCEED();
+                }
+
+                state = Normal;
+                break;
+            default:
+                UNREACHABLE();
+                break;
+            }
+        }
+
+        // Check the final state
+        switch (state) {
+            // Import the PathState enums for convenience
+            using enum PathState;
+        case Start:
+            R_THROW(ResultInvalidPathFormat);
+        case Normal:
+        case FirstSeparator:
+            *out = true;
+            break;
+        case Separator:
+        case CurrentDir:
+        case ParentDir:
+            *out = false;
+            break;
+        default:
+            UNREACHABLE();
+            break;
+        }
+
+        // Set the output length
+        *out_len = len;
+        R_SUCCEED();
+    }
+
+    static Result Normalize(char* dst, size_t* out_len, const char* path, size_t max_out_size,
+                            bool is_windows_path, bool is_drive_relative_path,
+                            bool allow_all_characters = false) {
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Prepare to iterate
+        const char* cur_path = path;
+        size_t total_len = 0;
+
+        // If path begins with a separator, check that we're not drive relative
+        if (cur_path[0] != DirectorySeparator) {
+            R_UNLESS(is_drive_relative_path, ResultInvalidPathFormat);
+
+            dst[total_len++] = DirectorySeparator;
+        }
+
+        // We're going to need to do path replacement, potentially
+        char* replacement_path = nullptr;
+        size_t replacement_path_size = 0;
+
+        SCOPE_EXIT({
+            if (replacement_path != nullptr) {
+                if (std::is_constant_evaluated()) {
+                    delete[] replacement_path;
+                } else {
+                    Deallocate(replacement_path, replacement_path_size);
+                }
+            }
+        });
+
+        // Perform path replacement, if necessary
+        if (IsParentDirectoryPathReplacementNeeded(cur_path)) {
+            if (std::is_constant_evaluated()) {
+                replacement_path_size = EntryNameLengthMax + 1;
+                replacement_path = new char[replacement_path_size];
+            } else {
+                replacement_path_size = EntryNameLengthMax + 1;
+                replacement_path = static_cast<char*>(Allocate(replacement_path_size));
+            }
+
+            ReplaceParentDirectoryPath(replacement_path, cur_path);
+
+            cur_path = replacement_path;
+        }
+
+        // Iterate, normalizing path components
+        bool skip_next_sep = false;
+        size_t i = 0;
+
+        while (cur_path[i] != NullTerminator) {
+            // Process a directory separator, if we run into one
+            if (cur_path[i] == DirectorySeparator) {
+                // Swallow separators
+                do {
+                    ++i;
+                } while (cur_path[i] == DirectorySeparator);
+
+                // Check if we hit end of string
+                if (cur_path[i] == NullTerminator) {
+                    break;
+                }
+
+                // If we aren't skipping the separator, write it, checking that we remain in bounds.
+                if (!skip_next_sep) {
+                    if (total_len + 1 == max_out_size) {
+                        dst[total_len] = NullTerminator;
+                        *out_len = total_len;
+                        R_THROW(ResultTooLongPath);
+                    }
+
+                    dst[total_len++] = DirectorySeparator;
+                }
+
+                // Don't skip the next separator
+                skip_next_sep = false;
+            }
+
+            // Get the length of the current directory component
+            size_t dir_len = 0;
+            while (cur_path[i + dir_len] != DirectorySeparator &&
+                   cur_path[i + dir_len] != NullTerminator) {
+                // Check for validity
+                if (!allow_all_characters) {
+                    R_UNLESS(!IsInvalidCharacter(cur_path[i + dir_len]), ResultInvalidCharacter);
+                }
+
+                ++dir_len;
+            }
+
+            // Handle the current dir component
+            if (IsCurrentDirectory(cur_path + i)) {
+                skip_next_sep = true;
+            } else if (IsParentDirectory(cur_path + i)) {
+                // We should have just written a separator
+                ASSERT(dst[total_len - 1] == DirectorySeparator);
+
+                // We should have started with a separator, for non-windows paths
+                if (!is_windows_path) {
+                    ASSERT(dst[0] == DirectorySeparator);
+                }
+
+                // Remove the previous component
+                if (total_len == 1) {
+                    R_UNLESS(is_windows_path, ResultDirectoryUnobtainable);
+
+                    --total_len;
+                } else {
+                    total_len -= 2;
+
+                    do {
+                        if (dst[total_len] == DirectorySeparator) {
+                            break;
+                        }
+                    } while ((--total_len) != 0);
+                }
+
+                // We should be pointing to a directory separator, for non-windows paths
+                if (!is_windows_path) {
+                    ASSERT(dst[total_len] == DirectorySeparator);
+                }
+
+                // We should remain in bounds
+                ASSERT(total_len < max_out_size);
+            } else {
+                // Copy, possibly truncating
+                if (total_len + dir_len + 1 > max_out_size) {
+                    const size_t copy_len = max_out_size - (total_len + 1);
+
+                    for (size_t j = 0; j < copy_len; ++j) {
+                        dst[total_len++] = cur_path[i + j];
+                    }
+
+                    dst[total_len] = NullTerminator;
+                    *out_len = total_len;
+                    R_THROW(ResultTooLongPath);
+                }
+
+                for (size_t j = 0; j < dir_len; ++j) {
+                    dst[total_len++] = cur_path[i + j];
+                }
+            }
+
+            // Advance past the current directory component
+            i += dir_len;
+        }
+
+        if (skip_next_sep) {
+            --total_len;
+        }
+
+        if (total_len == 0 && max_out_size != 0) {
+            total_len = 1;
+            dst[0] = DirectorySeparator;
+        }
+
+        // NOTE: Probable nintendo bug, as max_out_size must be at least total_len + 1 for the null
+        // terminator.
+        R_UNLESS(max_out_size >= total_len - 1, ResultTooLongPath);
+
+        dst[total_len] = NullTerminator;
+
+        // Check that the result path is normalized
+        bool is_normalized;
+        size_t dummy;
+        R_TRY(IsNormalized(std::addressof(is_normalized), std::addressof(dummy), dst,
+                           allow_all_characters));
+
+        // Assert that the result path is normalized
+        ASSERT(is_normalized);
+
+        // Set the output length
+        *out_len = total_len;
+        R_SUCCEED();
+    }
+};
+
+class PathFormatter {
+private:
+    static constexpr Result CheckSharedName(const char* name, size_t len) {
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        if (len == 1) {
+            R_UNLESS(name[0] != Dot, ResultInvalidPathFormat);
+        } else if (len == 2) {
+            R_UNLESS(name[0] != Dot || name[1] != Dot, ResultInvalidPathFormat);
+        }
+
+        for (size_t i = 0; i < len; ++i) {
+            R_UNLESS(!IsInvalidCharacter(name[i]), ResultInvalidCharacter);
+        }
+
+        R_SUCCEED();
+    }
+
+    static constexpr Result CheckHostName(const char* name, size_t len) {
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        if (len == 2) {
+            R_UNLESS(name[0] != Dot || name[1] != Dot, ResultInvalidPathFormat);
+        }
+
+        for (size_t i = 0; i < len; ++i) {
+            R_UNLESS(!IsInvalidCharacterForHostName(name[i]), ResultInvalidCharacter);
+        }
+
+        R_SUCCEED();
+    }
+
+    static constexpr Result CheckInvalidBackslash(bool* out_contains_backslash, const char* path,
+                                                  bool allow_backslash) {
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Default to no backslashes, so we can just write if we see one
+        *out_contains_backslash = false;
+
+        while (*path != NullTerminator) {
+            if (*(path++) == AlternateDirectorySeparator) {
+                *out_contains_backslash = true;
+
+                R_UNLESS(allow_backslash, ResultInvalidCharacter);
+            }
+        }
+
+        R_SUCCEED();
+    }
+
+public:
+    static constexpr Result CheckPathFormat(const char* path, const PathFlags& flags) {
+        bool normalized;
+        size_t len;
+        R_RETURN(IsNormalized(std::addressof(normalized), std::addressof(len), path, flags));
+    }
+
+    static constexpr Result SkipMountName(const char** out, size_t* out_len, const char* path) {
+        R_RETURN(ParseMountName(out, out_len, nullptr, 0, path));
+    }
+
+    static constexpr Result ParseMountName(const char** out, size_t* out_len, char* out_mount_name,
+                                           size_t out_mount_name_buffer_size, const char* path) {
+        // Check pre-conditions
+        ASSERT(path != nullptr);
+        ASSERT(out_len != nullptr);
+        ASSERT(out != nullptr);
+        ASSERT((out_mount_name == nullptr) == (out_mount_name_buffer_size == 0));
+
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Determine max mount length
+        const auto max_mount_len =
+            out_mount_name_buffer_size == 0
+                ? MountNameLengthMax + 1
+                : std::min(MountNameLengthMax + 1, out_mount_name_buffer_size);
+
+        // Parse the path until we see a drive separator
+        size_t mount_len = 0;
+        for (/* ... */; mount_len < max_mount_len && path[mount_len]; ++mount_len) {
+            const char c = path[mount_len];
+
+            // If we see a drive separator, advance, then we're done with the pre-drive separator
+            // part of the mount.
+            if (c == DriveSeparator) {
+                ++mount_len;
+                break;
+            }
+
+            // If we see a directory separator, we're not in a mount name
+            if (c == DirectorySeparator || c == AlternateDirectorySeparator) {
+                *out = path;
+                *out_len = 0;
+                R_SUCCEED();
+            }
+        }
+
+        // Check to be sure we're actually looking at a mount name
+        if (mount_len <= 2 || path[mount_len - 1] != DriveSeparator) {
+            *out = path;
+            *out_len = 0;
+            R_SUCCEED();
+        }
+
+        // Check that all characters in the mount name are allowable
+        for (size_t i = 0; i < mount_len; ++i) {
+            R_UNLESS(!IsInvalidCharacterForMountName(path[i]), ResultInvalidCharacter);
+        }
+
+        // Copy out the mount name
+        if (out_mount_name_buffer_size > 0) {
+            R_UNLESS(mount_len < out_mount_name_buffer_size, ResultTooLongPath);
+
+            for (size_t i = 0; i < mount_len; ++i) {
+                out_mount_name[i] = path[i];
+            }
+            out_mount_name[mount_len] = NullTerminator;
+        }
+
+        // Set the output
+        *out = path + mount_len;
+        *out_len = mount_len;
+        R_SUCCEED();
+    }
+
+    static constexpr Result SkipRelativeDotPath(const char** out, size_t* out_len,
+                                                const char* path) {
+        R_RETURN(ParseRelativeDotPath(out, out_len, nullptr, 0, path));
+    }
+
+    static constexpr Result ParseRelativeDotPath(const char** out, size_t* out_len,
+                                                 char* out_relative,
+                                                 size_t out_relative_buffer_size,
+                                                 const char* path) {
+        // Check pre-conditions
+        ASSERT(path != nullptr);
+        ASSERT(out_len != nullptr);
+        ASSERT(out != nullptr);
+        ASSERT((out_relative == nullptr) == (out_relative_buffer_size == 0));
+
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Initialize the output buffer, if we have one
+        if (out_relative_buffer_size > 0) {
+            out_relative[0] = NullTerminator;
+        }
+
+        // Check if the path is relative
+        if (path[0] == Dot && (path[1] == NullTerminator || path[1] == DirectorySeparator ||
+                               path[1] == AlternateDirectorySeparator)) {
+            if (out_relative_buffer_size > 0) {
+                R_UNLESS(out_relative_buffer_size >= 2, ResultTooLongPath);
+
+                out_relative[0] = Dot;
+                out_relative[1] = NullTerminator;
+            }
+
+            *out = path + 1;
+            *out_len = 1;
+            R_SUCCEED();
+        }
+
+        // Ensure the path isn't a parent directory
+        R_UNLESS(!(path[0] == Dot && path[1] == Dot), ResultDirectoryUnobtainable);
+
+        // There was no relative dot path
+        *out = path;
+        *out_len = 0;
+        R_SUCCEED();
+    }
+
+    static constexpr Result SkipWindowsPath(const char** out, size_t* out_len, bool* out_normalized,
+                                            const char* path, bool has_mount_name) {
+        // We're normalized if and only if the parsing doesn't throw ResultNotNormalized()
+        *out_normalized = true;
+
+        R_TRY_CATCH(ParseWindowsPath(out, out_len, nullptr, 0, path, has_mount_name)) {
+            R_CATCH(ResultNotNormalized) {
+                *out_normalized = false;
+            }
+        }
+        R_END_TRY_CATCH;
+        ON_RESULT_INCLUDED(ResultNotNormalized) {
+            *out_normalized = false;
+        };
+
+        R_SUCCEED();
+    }
+
+    static constexpr Result ParseWindowsPath(const char** out, size_t* out_len, char* out_win,
+                                             size_t out_win_buffer_size, const char* path,
+                                             bool has_mount_name) {
+        // Check pre-conditions
+        ASSERT(path != nullptr);
+        ASSERT(out_len != nullptr);
+        ASSERT(out != nullptr);
+        ASSERT((out_win == nullptr) == (out_win_buffer_size == 0));
+
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Initialize the output buffer, if we have one
+        if (out_win_buffer_size > 0) {
+            out_win[0] = NullTerminator;
+        }
+
+        // Handle path start
+        const char* cur_path = path;
+        if (has_mount_name && path[0] == DirectorySeparator) {
+            if (path[1] == AlternateDirectorySeparator && path[2] == AlternateDirectorySeparator) {
+                R_UNLESS(out_win_buffer_size > 0, ResultNotNormalized);
+
+                ++cur_path;
+            } else if (IsWindowsDrive(path + 1)) {
+                R_UNLESS(out_win_buffer_size > 0, ResultNotNormalized);
+
+                ++cur_path;
+            }
+        }
+
+        // Handle windows drive
+        if (IsWindowsDrive(cur_path)) {
+            // Parse up to separator
+            size_t win_path_len = WindowsDriveLength;
+            for (/* ... */; cur_path[win_path_len] != NullTerminator; ++win_path_len) {
+                R_UNLESS(!IsInvalidCharacter(cur_path[win_path_len]), ResultInvalidCharacter);
+
+                if (cur_path[win_path_len] == DirectorySeparator ||
+                    cur_path[win_path_len] == AlternateDirectorySeparator) {
+                    break;
+                }
+            }
+
+            // Ensure that we're normalized, if we're required to be
+            if (out_win_buffer_size == 0) {
+                for (size_t i = 0; i < win_path_len; ++i) {
+                    R_UNLESS(cur_path[i] != AlternateDirectorySeparator, ResultNotNormalized);
+                }
+            } else {
+                // Ensure we can copy into the normalized buffer
+                R_UNLESS(win_path_len < out_win_buffer_size, ResultTooLongPath);
+
+                for (size_t i = 0; i < win_path_len; ++i) {
+                    out_win[i] = cur_path[i];
+                }
+                out_win[win_path_len] = NullTerminator;
+
+                Replace(out_win, win_path_len, AlternateDirectorySeparator, DirectorySeparator);
+            }
+
+            *out = cur_path + win_path_len;
+            *out_len = win_path_len;
+            R_SUCCEED();
+        }
+
+        // Handle DOS device
+        if (IsDosDevicePath(cur_path)) {
+            size_t dos_prefix_len = DosDevicePathPrefixLength;
+
+            if (IsWindowsDrive(cur_path + dos_prefix_len)) {
+                dos_prefix_len += WindowsDriveLength;
+            } else {
+                --dos_prefix_len;
+            }
+
+            if (out_win_buffer_size > 0) {
+                // Ensure we can copy into the normalized buffer
+                R_UNLESS(dos_prefix_len < out_win_buffer_size, ResultTooLongPath);
+
+                for (size_t i = 0; i < dos_prefix_len; ++i) {
+                    out_win[i] = cur_path[i];
+                }
+                out_win[dos_prefix_len] = NullTerminator;
+
+                Replace(out_win, dos_prefix_len, DirectorySeparator, AlternateDirectorySeparator);
+            }
+
+            *out = cur_path + dos_prefix_len;
+            *out_len = dos_prefix_len;
+            R_SUCCEED();
+        }
+
+        // Handle UNC path
+        if (IsUncPath(cur_path, false, true)) {
+            const char* final_path = cur_path;
+
+            R_UNLESS(cur_path[UncPathPrefixLength] != DirectorySeparator, ResultInvalidPathFormat);
+            R_UNLESS(cur_path[UncPathPrefixLength] != AlternateDirectorySeparator,
+                     ResultInvalidPathFormat);
+
+            size_t cur_component_offset = 0;
+            size_t pos = UncPathPrefixLength;
+            for (/* ... */; cur_path[pos] != NullTerminator; ++pos) {
+                if (cur_path[pos] == DirectorySeparator ||
+                    cur_path[pos] == AlternateDirectorySeparator) {
+                    if (cur_component_offset != 0) {
+                        R_TRY(CheckSharedName(cur_path + cur_component_offset,
+                                              pos - cur_component_offset));
+
+                        final_path = cur_path + pos;
+                        break;
+                    }
+
+                    R_UNLESS(cur_path[pos + 1] != DirectorySeparator, ResultInvalidPathFormat);
+                    R_UNLESS(cur_path[pos + 1] != AlternateDirectorySeparator,
+                             ResultInvalidPathFormat);
+
+                    R_TRY(CheckHostName(cur_path + 2, pos - 2));
+
+                    cur_component_offset = pos + 1;
+                }
+            }
+
+            R_UNLESS(cur_component_offset != pos, ResultInvalidPathFormat);
+
+            if (cur_component_offset != 0 && final_path == cur_path) {
+                R_TRY(CheckSharedName(cur_path + cur_component_offset, pos - cur_component_offset));
+
+                final_path = cur_path + pos;
+            }
+
+            size_t unc_prefix_len = final_path - cur_path;
+
+            // Ensure that we're normalized, if we're required to be
+            if (out_win_buffer_size == 0) {
+                for (size_t i = 0; i < unc_prefix_len; ++i) {
+                    R_UNLESS(cur_path[i] != DirectorySeparator, ResultNotNormalized);
+                }
+            } else {
+                // Ensure we can copy into the normalized buffer
+                R_UNLESS(unc_prefix_len < out_win_buffer_size, ResultTooLongPath);
+
+                for (size_t i = 0; i < unc_prefix_len; ++i) {
+                    out_win[i] = cur_path[i];
+                }
+                out_win[unc_prefix_len] = NullTerminator;
+
+                Replace(out_win, unc_prefix_len, DirectorySeparator, AlternateDirectorySeparator);
+            }
+
+            *out = cur_path + unc_prefix_len;
+            *out_len = unc_prefix_len;
+            R_SUCCEED();
+        }
+
+        // There's no windows path to parse
+        *out = path;
+        *out_len = 0;
+        R_SUCCEED();
+    }
+
+    static constexpr Result IsNormalized(bool* out, size_t* out_len, const char* path,
+                                         const PathFlags& flags = {}) {
+        // Ensure nothing is null
+        R_UNLESS(out != nullptr, ResultNullptrArgument);
+        R_UNLESS(out_len != nullptr, ResultNullptrArgument);
+        R_UNLESS(path != nullptr, ResultNullptrArgument);
+
+        // Verify that the path is valid utf-8
+        R_TRY(CheckUtf8(path));
+
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Handle the case where the path is empty
+        if (path[0] == NullTerminator) {
+            R_UNLESS(flags.IsEmptyPathAllowed(), ResultInvalidPathFormat);
+
+            *out = true;
+            *out_len = 0;
+            R_SUCCEED();
+        }
+
+        // All normalized paths start with a directory separator...unless they're windows paths,
+        // relative paths, or have mount names.
+        if (path[0] != DirectorySeparator) {
+            R_UNLESS(flags.IsWindowsPathAllowed() || flags.IsRelativePathAllowed() ||
+                         flags.IsMountNameAllowed(),
+                     ResultInvalidPathFormat);
+        }
+
+        // Check that the path is allowed to be a windows path, if it is
+        if (IsWindowsPath(path, false)) {
+            R_UNLESS(flags.IsWindowsPathAllowed(), ResultInvalidPathFormat);
+        }
+
+        // Skip past the mount name, if one is present
+        size_t total_len = 0;
+        size_t mount_name_len = 0;
+        R_TRY(SkipMountName(std::addressof(path), std::addressof(mount_name_len), path));
+
+        // If we had a mount name, check that that was allowed
+        if (mount_name_len > 0) {
+            R_UNLESS(flags.IsMountNameAllowed(), ResultInvalidPathFormat);
+
+            total_len += mount_name_len;
+        }
+
+        // Check that the path starts as a normalized path should
+        if (path[0] != DirectorySeparator && !IsPathStartWithCurrentDirectory(path) &&
+            !IsWindowsPath(path, false)) {
+            R_UNLESS(flags.IsRelativePathAllowed(), ResultInvalidPathFormat);
+            R_UNLESS(!IsInvalidCharacter(path[0]), ResultInvalidPathFormat);
+
+            *out = false;
+            R_SUCCEED();
+        }
+
+        // Process relative path
+        size_t relative_len = 0;
+        R_TRY(SkipRelativeDotPath(std::addressof(path), std::addressof(relative_len), path));
+
+        // If we have a relative path, check that was allowed
+        if (relative_len > 0) {
+            R_UNLESS(flags.IsRelativePathAllowed(), ResultInvalidPathFormat);
+
+            total_len += relative_len;
+
+            if (path[0] == NullTerminator) {
+                *out = true;
+                *out_len = total_len;
+                R_SUCCEED();
+            }
+        }
+
+        // Process windows path
+        size_t windows_len = 0;
+        bool normalized_win = false;
+        R_TRY(SkipWindowsPath(std::addressof(path), std::addressof(windows_len),
+                              std::addressof(normalized_win), path, mount_name_len > 0));
+
+        // If the windows path wasn't normalized, we're not normalized
+        if (!normalized_win) {
+            R_UNLESS(flags.IsWindowsPathAllowed(), ResultInvalidPathFormat);
+
+            *out = false;
+            R_SUCCEED();
+        }
+
+        // If we had a windows path, check that was allowed
+        if (windows_len > 0) {
+            R_UNLESS(flags.IsWindowsPathAllowed(), ResultInvalidPathFormat);
+
+            total_len += windows_len;
+
+            // We can't have both a relative path and a windows path
+            R_UNLESS(relative_len == 0, ResultInvalidPathFormat);
+
+            // A path ending in a windows path isn't normalized
+            if (path[0] == NullTerminator) {
+                *out = false;
+                R_SUCCEED();
+            }
+
+            // Check that there are no windows directory separators in the path
+            for (size_t i = 0; path[i] != NullTerminator; ++i) {
+                if (path[i] == AlternateDirectorySeparator) {
+                    *out = false;
+                    R_SUCCEED();
+                }
+            }
+        }
+
+        // Check that parent directory replacement is not needed if backslashes are allowed
+        if (flags.IsBackslashAllowed() &&
+            PathNormalizer::IsParentDirectoryPathReplacementNeeded(path)) {
+            *out = false;
+            R_SUCCEED();
+        }
+
+        // Check that the backslash state is valid
+        bool is_backslash_contained = false;
+        R_TRY(CheckInvalidBackslash(std::addressof(is_backslash_contained), path,
+                                    flags.IsWindowsPathAllowed() || flags.IsBackslashAllowed()));
+
+        // Check that backslashes are contained only if allowed
+        if (is_backslash_contained && !flags.IsBackslashAllowed()) {
+            *out = false;
+            R_SUCCEED();
+        }
+
+        // Check that the final result path is normalized
+        size_t normal_len = 0;
+        R_TRY(PathNormalizer::IsNormalized(out, std::addressof(normal_len), path,
+                                           flags.IsAllCharactersAllowed()));
+
+        // Add the normal length
+        total_len += normal_len;
+
+        // Set the output length
+        *out_len = total_len;
+        R_SUCCEED();
+    }
+
+    static Result Normalize(char* dst, size_t dst_size, const char* path, size_t path_len,
+                            const PathFlags& flags) {
+        // Use StringTraits names for remainder of scope
+        using namespace StringTraits;
+
+        // Prepare to iterate
+        const char* src = path;
+        size_t cur_pos = 0;
+        bool is_windows_path = false;
+
+        // Check if the path is empty
+        if (src[0] == NullTerminator) {
+            if (dst_size != 0) {
+                dst[0] = NullTerminator;
+            }
+
+            R_UNLESS(flags.IsEmptyPathAllowed(), ResultInvalidPathFormat);
+
+            R_SUCCEED();
+        }
+
+        // Handle a mount name
+        size_t mount_name_len = 0;
+        if (flags.IsMountNameAllowed()) {
+            R_TRY(ParseMountName(std::addressof(src), std::addressof(mount_name_len), dst + cur_pos,
+                                 dst_size - cur_pos, src));
+
+            cur_pos += mount_name_len;
+        }
+
+        // Handle a drive-relative prefix
+        bool is_drive_relative = false;
+        if (src[0] != DirectorySeparator && !IsPathStartWithCurrentDirectory(src) &&
+            !IsWindowsPath(src, false)) {
+            R_UNLESS(flags.IsRelativePathAllowed(), ResultInvalidPathFormat);
+            R_UNLESS(!IsInvalidCharacter(src[0]), ResultInvalidPathFormat);
+
+            dst[cur_pos++] = Dot;
+            is_drive_relative = true;
+        }
+
+        size_t relative_len = 0;
+        if (flags.IsRelativePathAllowed()) {
+            R_UNLESS(cur_pos < dst_size, ResultTooLongPath);
+
+            R_TRY(ParseRelativeDotPath(std::addressof(src), std::addressof(relative_len),
+                                       dst + cur_pos, dst_size - cur_pos, src));
+
+            cur_pos += relative_len;
+
+            if (src[0] == NullTerminator) {
+                R_UNLESS(cur_pos < dst_size, ResultTooLongPath);
+
+                dst[cur_pos] = NullTerminator;
+                R_SUCCEED();
+            }
+        }
+
+        // Handle a windows path
+        if (flags.IsWindowsPathAllowed()) {
+            const char* const orig = src;
+
+            R_UNLESS(cur_pos < dst_size, ResultTooLongPath);
+
+            size_t windows_len = 0;
+            R_TRY(ParseWindowsPath(std::addressof(src), std::addressof(windows_len), dst + cur_pos,
+                                   dst_size - cur_pos, src, mount_name_len != 0));
+
+            cur_pos += windows_len;
+
+            if (src[0] == NullTerminator) {
+                /* NOTE: Bug in original code here repeated, should be checking cur_pos + 2. */
+                R_UNLESS(cur_pos + 1 < dst_size, ResultTooLongPath);
+
+                dst[cur_pos + 0] = DirectorySeparator;
+                dst[cur_pos + 1] = NullTerminator;
+                R_SUCCEED();
+            }
+
+            if ((src - orig) > 0) {
+                is_windows_path = true;
+            }
+        }
+
+        // Check for invalid backslash
+        bool backslash_contained = false;
+        R_TRY(CheckInvalidBackslash(std::addressof(backslash_contained), src,
+                                    flags.IsWindowsPathAllowed() || flags.IsBackslashAllowed()));
+
+        // Handle backslash replacement as necessary
+        if (backslash_contained && flags.IsWindowsPathAllowed()) {
+            // Create a temporary buffer holding a slash-replaced version of the path.
+            // NOTE: Nintendo unnecessarily allocates and replaces here a fully copy of the path,
+            // despite having skipped some of it already.
+            const size_t replaced_src_len = path_len - (src - path);
+
+            char* replaced_src = nullptr;
+            SCOPE_EXIT({
+                if (replaced_src != nullptr) {
+                    if (std::is_constant_evaluated()) {
+                        delete[] replaced_src;
+                    } else {
+                        Deallocate(replaced_src, replaced_src_len);
+                    }
+                }
+            });
+
+            if (std::is_constant_evaluated()) {
+                replaced_src = new char[replaced_src_len];
+            } else {
+                replaced_src = static_cast<char*>(Allocate(replaced_src_len));
+            }
+
+            Strlcpy<char>(replaced_src, src, replaced_src_len);
+
+            Replace(replaced_src, replaced_src_len, AlternateDirectorySeparator,
+                    DirectorySeparator);
+
+            size_t dummy;
+            R_TRY(PathNormalizer::Normalize(dst + cur_pos, std::addressof(dummy), replaced_src,
+                                            dst_size - cur_pos, is_windows_path, is_drive_relative,
+                                            flags.IsAllCharactersAllowed()));
+        } else {
+            // We can just do normalization
+            size_t dummy;
+            R_TRY(PathNormalizer::Normalize(dst + cur_pos, std::addressof(dummy), src,
+                                            dst_size - cur_pos, is_windows_path, is_drive_relative,
+                                            flags.IsAllCharactersAllowed()));
+        }
+
+        R_SUCCEED();
+    }
+};
+
+} // namespace FileSys
diff --git a/src/core/file_sys/fs_string_util.h b/src/core/file_sys/fs_string_util.h
new file mode 100644
index 000000000..874e09054
--- /dev/null
+++ b/src/core/file_sys/fs_string_util.h
@@ -0,0 +1,226 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/assert.h"
+
+namespace FileSys {
+
+template <typename T>
+constexpr int Strlen(const T* str) {
+    ASSERT(str != nullptr);
+
+    int length = 0;
+    while (*str++) {
+        ++length;
+    }
+
+    return length;
+}
+
+template <typename T>
+constexpr int Strnlen(const T* str, int count) {
+    ASSERT(str != nullptr);
+    ASSERT(count >= 0);
+
+    int length = 0;
+    while (count-- && *str++) {
+        ++length;
+    }
+
+    return length;
+}
+
+template <typename T>
+constexpr int Strncmp(const T* lhs, const T* rhs, int count) {
+    ASSERT(lhs != nullptr);
+    ASSERT(rhs != nullptr);
+    ASSERT(count >= 0);
+
+    if (count == 0) {
+        return 0;
+    }
+
+    T l, r;
+    do {
+        l = *(lhs++);
+        r = *(rhs++);
+    } while (l && (l == r) && (--count));
+
+    return l - r;
+}
+
+template <typename T>
+static constexpr int Strlcpy(T* dst, const T* src, int count) {
+    ASSERT(dst != nullptr);
+    ASSERT(src != nullptr);
+
+    const T* cur = src;
+    if (count > 0) {
+        while ((--count) && *cur) {
+            *(dst++) = *(cur++);
+        }
+        *dst = 0;
+    }
+
+    while (*cur) {
+        cur++;
+    }
+
+    return static_cast<int>(cur - src);
+}
+
+enum CharacterEncodingResult {
+    CharacterEncodingResult_Success = 0,
+    CharacterEncodingResult_InsufficientLength = 1,
+    CharacterEncodingResult_InvalidFormat = 2,
+};
+
+namespace impl {
+
+class CharacterEncodingHelper {
+public:
+    static constexpr int8_t Utf8NBytesInnerTable[0x100 + 1] = {
+        -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1,  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1,  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1,  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+        1,  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+        2,  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3,
+        3,  3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8,
+    };
+
+    static constexpr char GetUtf8NBytes(size_t i) {
+        return static_cast<char>(Utf8NBytesInnerTable[1 + i]);
+    }
+};
+
+} // namespace impl
+
+constexpr inline CharacterEncodingResult ConvertCharacterUtf8ToUtf32(u32* dst, const char* src) {
+    // Check pre-conditions
+    ASSERT(dst != nullptr);
+    ASSERT(src != nullptr);
+
+    // Perform the conversion
+    const auto* p = src;
+    switch (impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[0]))) {
+    case 1:
+        *dst = static_cast<u32>(p[0]);
+        return CharacterEncodingResult_Success;
+    case 2:
+        if ((static_cast<u32>(p[0]) & 0x1E) != 0) {
+            if (impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[1])) ==
+                0) {
+                *dst = (static_cast<u32>(p[0] & 0x1F) << 6) | (static_cast<u32>(p[1] & 0x3F) << 0);
+                return CharacterEncodingResult_Success;
+            }
+        }
+        break;
+    case 3:
+        if (impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[1])) == 0 &&
+            impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[2])) == 0) {
+            const u32 c = (static_cast<u32>(p[0] & 0xF) << 12) |
+                          (static_cast<u32>(p[1] & 0x3F) << 6) |
+                          (static_cast<u32>(p[2] & 0x3F) << 0);
+            if ((c & 0xF800) != 0 && (c & 0xF800) != 0xD800) {
+                *dst = c;
+                return CharacterEncodingResult_Success;
+            }
+        }
+        return CharacterEncodingResult_InvalidFormat;
+    case 4:
+        if (impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[1])) == 0 &&
+            impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[2])) == 0 &&
+            impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[3])) == 0) {
+            const u32 c =
+                (static_cast<u32>(p[0] & 0x7) << 18) | (static_cast<u32>(p[1] & 0x3F) << 12) |
+                (static_cast<u32>(p[2] & 0x3F) << 6) | (static_cast<u32>(p[3] & 0x3F) << 0);
+            if (c >= 0x10000 && c < 0x110000) {
+                *dst = c;
+                return CharacterEncodingResult_Success;
+            }
+        }
+        return CharacterEncodingResult_InvalidFormat;
+    default:
+        break;
+    }
+
+    // We failed to convert
+    return CharacterEncodingResult_InvalidFormat;
+}
+
+constexpr inline CharacterEncodingResult PickOutCharacterFromUtf8String(char* dst,
+                                                                        const char** str) {
+    // Check pre-conditions
+    ASSERT(dst != nullptr);
+    ASSERT(str != nullptr);
+    ASSERT(*str != nullptr);
+
+    // Clear the output
+    dst[0] = 0;
+    dst[1] = 0;
+    dst[2] = 0;
+    dst[3] = 0;
+
+    // Perform the conversion
+    const auto* p = *str;
+    u32 c = static_cast<u32>(*p);
+    switch (impl::CharacterEncodingHelper::GetUtf8NBytes(c)) {
+    case 1:
+        dst[0] = (*str)[0];
+        ++(*str);
+        break;
+    case 2:
+        if ((p[0] & 0x1E) != 0) {
+            if (impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[1])) ==
+                0) {
+                c = (static_cast<u32>(p[0] & 0x1F) << 6) | (static_cast<u32>(p[1] & 0x3F) << 0);
+                dst[0] = (*str)[0];
+                dst[1] = (*str)[1];
+                (*str) += 2;
+                break;
+            }
+        }
+        return CharacterEncodingResult_InvalidFormat;
+    case 3:
+        if (impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[1])) == 0 &&
+            impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[2])) == 0) {
+            c = (static_cast<u32>(p[0] & 0xF) << 12) | (static_cast<u32>(p[1] & 0x3F) << 6) |
+                (static_cast<u32>(p[2] & 0x3F) << 0);
+            if ((c & 0xF800) != 0 && (c & 0xF800) != 0xD800) {
+                dst[0] = (*str)[0];
+                dst[1] = (*str)[1];
+                dst[2] = (*str)[2];
+                (*str) += 3;
+                break;
+            }
+        }
+        return CharacterEncodingResult_InvalidFormat;
+    case 4:
+        if (impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[1])) == 0 &&
+            impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[2])) == 0 &&
+            impl::CharacterEncodingHelper::GetUtf8NBytes(static_cast<unsigned char>(p[3])) == 0) {
+            c = (static_cast<u32>(p[0] & 0x7) << 18) | (static_cast<u32>(p[1] & 0x3F) << 12) |
+                (static_cast<u32>(p[2] & 0x3F) << 6) | (static_cast<u32>(p[3] & 0x3F) << 0);
+            if (c >= 0x10000 && c < 0x110000) {
+                dst[0] = (*str)[0];
+                dst[1] = (*str)[1];
+                dst[2] = (*str)[2];
+                dst[3] = (*str)[3];
+                (*str) += 4;
+                break;
+            }
+        }
+        return CharacterEncodingResult_InvalidFormat;
+    default:
+        return CharacterEncodingResult_InvalidFormat;
+    }
+
+    return CharacterEncodingResult_Success;
+}
+
+} // namespace FileSys
diff --git a/src/core/file_sys/fsmitm_romfsbuild.cpp b/src/core/file_sys/fsmitm_romfsbuild.cpp
index dd9cca103..8807bbd0f 100644
--- a/src/core/file_sys/fsmitm_romfsbuild.cpp
+++ b/src/core/file_sys/fsmitm_romfsbuild.cpp
@@ -8,8 +8,8 @@
 #include "common/assert.h"
 #include "core/file_sys/fsmitm_romfsbuild.h"
 #include "core/file_sys/ips_layer.h"
-#include "core/file_sys/vfs.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fsmitm_romfsbuild.h b/src/core/file_sys/fsmitm_romfsbuild.h
index f387c79f1..dd7ed4a7b 100644
--- a/src/core/file_sys/fsmitm_romfsbuild.h
+++ b/src/core/file_sys/fsmitm_romfsbuild.h
@@ -7,7 +7,7 @@
 #include <memory>
 #include <string>
 #include "common/common_types.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fs_i_storage.h b/src/core/file_sys/fssystem/fs_i_storage.h
index 416dd57b8..37336c9ae 100644
--- a/src/core/file_sys/fssystem/fs_i_storage.h
+++ b/src/core/file_sys/fssystem/fs_i_storage.h
@@ -5,7 +5,7 @@
 
 #include "common/overflow.h"
 #include "core/file_sys/errors.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.cpp b/src/core/file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.cpp
index f25c95472..bc1cddbb0 100644
--- a/src/core/file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.cpp
+++ b/src/core/file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.cpp
@@ -4,7 +4,7 @@
 #include "core/file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.h"
 #include "core/file_sys/fssystem/fssystem_aes_ctr_storage.h"
 #include "core/file_sys/fssystem/fssystem_nca_header.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_aes_ctr_storage.h b/src/core/file_sys/fssystem/fssystem_aes_ctr_storage.h
index 339e49697..5abd93d33 100644
--- a/src/core/file_sys/fssystem/fssystem_aes_ctr_storage.h
+++ b/src/core/file_sys/fssystem/fssystem_aes_ctr_storage.h
@@ -9,7 +9,7 @@
 #include "core/crypto/key_manager.h"
 #include "core/file_sys/errors.h"
 #include "core/file_sys/fssystem/fs_i_storage.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_bucket_tree.h b/src/core/file_sys/fssystem/fssystem_bucket_tree.h
index 46850cd48..3a5e21d1a 100644
--- a/src/core/file_sys/fssystem/fssystem_bucket_tree.h
+++ b/src/core/file_sys/fssystem/fssystem_bucket_tree.h
@@ -10,7 +10,7 @@
 #include "common/common_types.h"
 #include "common/literals.h"
 
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/hle/result.h"
 
 namespace FileSys {
diff --git a/src/core/file_sys/fssystem/fssystem_compressed_storage.h b/src/core/file_sys/fssystem/fssystem_compressed_storage.h
index 33d93938e..74c98630e 100644
--- a/src/core/file_sys/fssystem/fssystem_compressed_storage.h
+++ b/src/core/file_sys/fssystem/fssystem_compressed_storage.h
@@ -10,7 +10,7 @@
 #include "core/file_sys/fssystem/fssystem_bucket_tree.h"
 #include "core/file_sys/fssystem/fssystem_compression_common.h"
 #include "core/file_sys/fssystem/fssystem_pooled_buffer.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.cpp b/src/core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.cpp
index 4a75b5308..39bb7b808 100644
--- a/src/core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.cpp
+++ b/src/core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.cpp
@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.h b/src/core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.h
index 5cf697efe..bd129db47 100644
--- a/src/core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.h
+++ b/src/core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.h
@@ -8,7 +8,7 @@
 #include "core/file_sys/fssystem/fs_types.h"
 #include "core/file_sys/fssystem/fssystem_alignment_matching_storage.h"
 #include "core/file_sys/fssystem/fssystem_integrity_verification_storage.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h b/src/core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h
index 18df400af..41d3960b8 100644
--- a/src/core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h
+++ b/src/core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h
@@ -7,7 +7,7 @@
 
 #include "core/file_sys/errors.h"
 #include "core/file_sys/fssystem/fs_i_storage.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_indirect_storage.h b/src/core/file_sys/fssystem/fssystem_indirect_storage.h
index 7854335bf..d4b95fd27 100644
--- a/src/core/file_sys/fssystem/fssystem_indirect_storage.h
+++ b/src/core/file_sys/fssystem/fssystem_indirect_storage.h
@@ -7,8 +7,8 @@
 #include "core/file_sys/fssystem/fs_i_storage.h"
 #include "core/file_sys/fssystem/fssystem_bucket_tree.h"
 #include "core/file_sys/fssystem/fssystem_bucket_tree_template_impl.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"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_integrity_romfs_storage.h b/src/core/file_sys/fssystem/fssystem_integrity_romfs_storage.h
index 5f8512b2a..240d1e388 100644
--- a/src/core/file_sys/fssystem/fssystem_integrity_romfs_storage.h
+++ b/src/core/file_sys/fssystem/fssystem_integrity_romfs_storage.h
@@ -5,7 +5,7 @@
 
 #include "core/file_sys/fssystem/fssystem_hierarchical_integrity_verification_storage.h"
 #include "core/file_sys/fssystem/fssystem_nca_header.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_nca_file_system_driver.cpp b/src/core/file_sys/fssystem/fssystem_nca_file_system_driver.cpp
index 0f5432203..ab5a7984e 100644
--- a/src/core/file_sys/fssystem/fssystem_nca_file_system_driver.cpp
+++ b/src/core/file_sys/fssystem/fssystem_nca_file_system_driver.cpp
@@ -14,8 +14,8 @@
 #include "core/file_sys/fssystem/fssystem_nca_file_system_driver.h"
 #include "core/file_sys/fssystem/fssystem_sparse_storage.h"
 #include "core/file_sys/fssystem/fssystem_switch_storage.h"
-#include "core/file_sys/vfs_offset.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_nca_file_system_driver.h b/src/core/file_sys/fssystem/fssystem_nca_file_system_driver.h
index 5771a21fc..5bc838de6 100644
--- a/src/core/file_sys/fssystem/fssystem_nca_file_system_driver.h
+++ b/src/core/file_sys/fssystem/fssystem_nca_file_system_driver.h
@@ -5,7 +5,7 @@
 
 #include "core/file_sys/fssystem/fssystem_compression_common.h"
 #include "core/file_sys/fssystem/fssystem_nca_header.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/fssystem/fssystem_nca_reader.cpp b/src/core/file_sys/fssystem/fssystem_nca_reader.cpp
index a3714ab37..08924e2a6 100644
--- a/src/core/file_sys/fssystem/fssystem_nca_reader.cpp
+++ b/src/core/file_sys/fssystem/fssystem_nca_reader.cpp
@@ -3,7 +3,7 @@
 
 #include "core/file_sys/fssystem/fssystem_aes_xts_storage.h"
 #include "core/file_sys/fssystem/fssystem_nca_file_system_driver.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/ips_layer.cpp b/src/core/file_sys/ips_layer.cpp
index 31033634c..d1ac24072 100644
--- a/src/core/file_sys/ips_layer.cpp
+++ b/src/core/file_sys/ips_layer.cpp
@@ -12,7 +12,7 @@
 #include "common/logging/log.h"
 #include "common/swap.h"
 #include "core/file_sys/ips_layer.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/ips_layer.h b/src/core/file_sys/ips_layer.h
index f2717bae7..d81378e8a 100644
--- a/src/core/file_sys/ips_layer.h
+++ b/src/core/file_sys/ips_layer.h
@@ -8,7 +8,7 @@
 #include <vector>
 
 #include "common/common_types.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/kernel_executable.cpp b/src/core/file_sys/kernel_executable.cpp
index 70c062f4c..b84492d30 100644
--- a/src/core/file_sys/kernel_executable.cpp
+++ b/src/core/file_sys/kernel_executable.cpp
@@ -5,7 +5,7 @@
 
 #include "common/string_util.h"
 #include "core/file_sys/kernel_executable.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 #include "core/loader/loader.h"
 
 namespace FileSys {
diff --git a/src/core/file_sys/kernel_executable.h b/src/core/file_sys/kernel_executable.h
index d5b9199b5..928ba2d99 100644
--- a/src/core/file_sys/kernel_executable.h
+++ b/src/core/file_sys/kernel_executable.h
@@ -10,7 +10,7 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "common/swap.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace Loader {
 enum class ResultStatus : u16;
diff --git a/src/core/file_sys/mode.h b/src/core/file_sys/mode.h
deleted file mode 100644
index 9596ef4fd..000000000
--- a/src/core/file_sys/mode.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#pragma once
-
-#include "common/common_funcs.h"
-#include "common/common_types.h"
-
-namespace FileSys {
-
-enum class Mode : u32 {
-    Read = 1 << 0,
-    Write = 1 << 1,
-    ReadWrite = Read | Write,
-    Append = 1 << 2,
-    ReadAppend = Read | Append,
-    WriteAppend = Write | Append,
-    All = ReadWrite | Append,
-};
-
-DECLARE_ENUM_FLAG_OPERATORS(Mode)
-
-} // namespace FileSys
diff --git a/src/core/file_sys/nca_metadata.cpp b/src/core/file_sys/nca_metadata.cpp
index f4a774675..9e855c50d 100644
--- a/src/core/file_sys/nca_metadata.cpp
+++ b/src/core/file_sys/nca_metadata.cpp
@@ -6,7 +6,7 @@
 #include "common/logging/log.h"
 #include "common/swap.h"
 #include "core/file_sys/nca_metadata.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/nca_metadata.h b/src/core/file_sys/nca_metadata.h
index 68e463b5f..6243b822a 100644
--- a/src/core/file_sys/nca_metadata.h
+++ b/src/core/file_sys/nca_metadata.h
@@ -8,7 +8,7 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "common/swap.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys {
 class CNMT;
diff --git a/src/core/file_sys/partition_filesystem.cpp b/src/core/file_sys/partition_filesystem.cpp
index 2422cb51b..dd8de9d8a 100644
--- a/src/core/file_sys/partition_filesystem.cpp
+++ b/src/core/file_sys/partition_filesystem.cpp
@@ -9,7 +9,7 @@
 
 #include "common/logging/log.h"
 #include "core/file_sys/partition_filesystem.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 #include "core/loader/loader.h"
 
 namespace FileSys {
diff --git a/src/core/file_sys/partition_filesystem.h b/src/core/file_sys/partition_filesystem.h
index b6e3a2b0c..777b9ead9 100644
--- a/src/core/file_sys/partition_filesystem.h
+++ b/src/core/file_sys/partition_filesystem.h
@@ -9,7 +9,7 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "common/swap.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Loader {
 enum class ResultStatus : u16;
diff --git a/src/core/file_sys/patch_manager.cpp b/src/core/file_sys/patch_manager.cpp
index 612122224..21d45235e 100644
--- a/src/core/file_sys/patch_manager.cpp
+++ b/src/core/file_sys/patch_manager.cpp
@@ -21,9 +21,9 @@
 #include "core/file_sys/patch_manager.h"
 #include "core/file_sys/registered_cache.h"
 #include "core/file_sys/romfs.h"
-#include "core/file_sys/vfs_cached.h"
-#include "core/file_sys/vfs_layered.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_cached.h"
+#include "core/file_sys/vfs/vfs_layered.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 #include "core/hle/service/filesystem/filesystem.h"
 #include "core/hle/service/ns/language.h"
 #include "core/hle/service/set/settings_server.h"
diff --git a/src/core/file_sys/patch_manager.h b/src/core/file_sys/patch_manager.h
index 2601b8217..552c0fbe2 100644
--- a/src/core/file_sys/patch_manager.h
+++ b/src/core/file_sys/patch_manager.h
@@ -9,7 +9,7 @@
 #include <string>
 #include "common/common_types.h"
 #include "core/file_sys/nca_metadata.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 #include "core/memory/dmnt_cheat_types.h"
 
 namespace Core {
diff --git a/src/core/file_sys/program_metadata.cpp b/src/core/file_sys/program_metadata.cpp
index 539c7f7af..ae4e441c9 100644
--- a/src/core/file_sys/program_metadata.cpp
+++ b/src/core/file_sys/program_metadata.cpp
@@ -7,7 +7,7 @@
 #include "common/logging/log.h"
 #include "common/scope_exit.h"
 #include "core/file_sys/program_metadata.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/loader/loader.h"
 
 namespace FileSys {
diff --git a/src/core/file_sys/program_metadata.h b/src/core/file_sys/program_metadata.h
index a53092b87..115e6d6cd 100644
--- a/src/core/file_sys/program_metadata.h
+++ b/src/core/file_sys/program_metadata.h
@@ -10,7 +10,7 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "common/swap.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace Loader {
 enum class ResultStatus : u16;
diff --git a/src/core/file_sys/registered_cache.cpp b/src/core/file_sys/registered_cache.cpp
index 1cc77ad14..85d30543c 100644
--- a/src/core/file_sys/registered_cache.cpp
+++ b/src/core/file_sys/registered_cache.cpp
@@ -17,7 +17,7 @@
 #include "core/file_sys/nca_metadata.h"
 #include "core/file_sys/registered_cache.h"
 #include "core/file_sys/submission_package.h"
-#include "core/file_sys/vfs_concat.h"
+#include "core/file_sys/vfs/vfs_concat.h"
 #include "core/loader/loader.h"
 
 namespace FileSys {
diff --git a/src/core/file_sys/registered_cache.h b/src/core/file_sys/registered_cache.h
index 64815a845..a7fc55673 100644
--- a/src/core/file_sys/registered_cache.h
+++ b/src/core/file_sys/registered_cache.h
@@ -11,7 +11,7 @@
 #include <boost/container/flat_map.hpp>
 #include "common/common_types.h"
 #include "core/crypto/key_manager.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 class CNMT;
diff --git a/src/core/file_sys/romfs.cpp b/src/core/file_sys/romfs.cpp
index 6182598ae..a2b280973 100644
--- a/src/core/file_sys/romfs.cpp
+++ b/src/core/file_sys/romfs.cpp
@@ -9,11 +9,11 @@
 #include "common/swap.h"
 #include "core/file_sys/fsmitm_romfsbuild.h"
 #include "core/file_sys/romfs.h"
-#include "core/file_sys/vfs.h"
-#include "core/file_sys/vfs_cached.h"
-#include "core/file_sys/vfs_concat.h"
-#include "core/file_sys/vfs_offset.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs.h"
+#include "core/file_sys/vfs/vfs_cached.h"
+#include "core/file_sys/vfs/vfs_concat.h"
+#include "core/file_sys/vfs/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 namespace FileSys {
 namespace {
diff --git a/src/core/file_sys/romfs.h b/src/core/file_sys/romfs.h
index b75ff1aad..3c0aca291 100644
--- a/src/core/file_sys/romfs.h
+++ b/src/core/file_sys/romfs.h
@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/romfs_factory.h b/src/core/file_sys/romfs_factory.h
index e4809bc94..11ecfabdf 100644
--- a/src/core/file_sys/romfs_factory.h
+++ b/src/core/file_sys/romfs_factory.h
@@ -6,7 +6,7 @@
 #include <memory>
 
 #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"
 
 namespace Loader {
diff --git a/src/core/file_sys/savedata_factory.cpp b/src/core/file_sys/savedata_factory.cpp
index 23196cd5f..cbf411a20 100644
--- a/src/core/file_sys/savedata_factory.cpp
+++ b/src/core/file_sys/savedata_factory.cpp
@@ -8,7 +8,7 @@
 #include "common/uuid.h"
 #include "core/core.h"
 #include "core/file_sys/savedata_factory.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/savedata_factory.h b/src/core/file_sys/savedata_factory.h
index 30d96928e..5ab7e4d32 100644
--- a/src/core/file_sys/savedata_factory.h
+++ b/src/core/file_sys/savedata_factory.h
@@ -7,7 +7,7 @@
 #include <string>
 #include "common/common_funcs.h"
 #include "common/common_types.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/hle/result.h"
 
 namespace Core {
diff --git a/src/core/file_sys/sdmc_factory.cpp b/src/core/file_sys/sdmc_factory.cpp
index d5158cd64..f3e2e21f4 100644
--- a/src/core/file_sys/sdmc_factory.cpp
+++ b/src/core/file_sys/sdmc_factory.cpp
@@ -4,7 +4,7 @@
 #include <memory>
 #include "core/file_sys/registered_cache.h"
 #include "core/file_sys/sdmc_factory.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 #include "core/file_sys/xts_archive.h"
 
 namespace FileSys {
diff --git a/src/core/file_sys/sdmc_factory.h b/src/core/file_sys/sdmc_factory.h
index a445fdb16..ee69ccd07 100644
--- a/src/core/file_sys/sdmc_factory.h
+++ b/src/core/file_sys/sdmc_factory.h
@@ -4,7 +4,7 @@
 #pragma once
 
 #include <memory>
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 #include "core/hle/result.h"
 
 namespace FileSys {
diff --git a/src/core/file_sys/submission_package.h b/src/core/file_sys/submission_package.h
index 915bffca9..935e9589d 100644
--- a/src/core/file_sys/submission_package.h
+++ b/src/core/file_sys/submission_package.h
@@ -9,7 +9,7 @@
 #include <vector>
 #include "common/common_types.h"
 #include "core/file_sys/nca_metadata.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Core::Crypto {
 class KeyManager;
diff --git a/src/core/file_sys/system_archive/mii_model.cpp b/src/core/file_sys/system_archive/mii_model.cpp
index 5c87b42f8..a96cb2cd2 100644
--- a/src/core/file_sys/system_archive/mii_model.cpp
+++ b/src/core/file_sys/system_archive/mii_model.cpp
@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "core/file_sys/system_archive/mii_model.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 namespace FileSys::SystemArchive {
 
diff --git a/src/core/file_sys/system_archive/mii_model.h b/src/core/file_sys/system_archive/mii_model.h
index b6cbefe24..61723ed0d 100644
--- a/src/core/file_sys/system_archive/mii_model.h
+++ b/src/core/file_sys/system_archive/mii_model.h
@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys::SystemArchive {
 
diff --git a/src/core/file_sys/system_archive/ng_word.cpp b/src/core/file_sys/system_archive/ng_word.cpp
index 5cf6749da..1fa67877d 100644
--- a/src/core/file_sys/system_archive/ng_word.cpp
+++ b/src/core/file_sys/system_archive/ng_word.cpp
@@ -4,7 +4,7 @@
 #include <fmt/format.h>
 #include "common/common_types.h"
 #include "core/file_sys/system_archive/ng_word.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 namespace FileSys::SystemArchive {
 
diff --git a/src/core/file_sys/system_archive/ng_word.h b/src/core/file_sys/system_archive/ng_word.h
index 1d7b49532..51bcc3327 100644
--- a/src/core/file_sys/system_archive/ng_word.h
+++ b/src/core/file_sys/system_archive/ng_word.h
@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys::SystemArchive {
 
diff --git a/src/core/file_sys/system_archive/shared_font.cpp b/src/core/file_sys/system_archive/shared_font.cpp
index 3210583f0..deb52069d 100644
--- a/src/core/file_sys/system_archive/shared_font.cpp
+++ b/src/core/file_sys/system_archive/shared_font.cpp
@@ -8,7 +8,7 @@
 #include "core/file_sys/system_archive/data/font_nintendo_extended.h"
 #include "core/file_sys/system_archive/data/font_standard.h"
 #include "core/file_sys/system_archive/shared_font.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 #include "core/hle/service/ns/iplatform_service_manager.h"
 
 namespace FileSys::SystemArchive {
diff --git a/src/core/file_sys/system_archive/shared_font.h b/src/core/file_sys/system_archive/shared_font.h
index d1cd1dc44..2d19fcde3 100644
--- a/src/core/file_sys/system_archive/shared_font.h
+++ b/src/core/file_sys/system_archive/shared_font.h
@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys::SystemArchive {
 
diff --git a/src/core/file_sys/system_archive/system_archive.h b/src/core/file_sys/system_archive/system_archive.h
index 02d9157bb..2f64247bc 100644
--- a/src/core/file_sys/system_archive/system_archive.h
+++ b/src/core/file_sys/system_archive/system_archive.h
@@ -4,7 +4,7 @@
 #pragma once
 
 #include "common/common_types.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys::SystemArchive {
 
diff --git a/src/core/file_sys/system_archive/system_version.cpp b/src/core/file_sys/system_archive/system_version.cpp
index e4751c2b4..5662004b7 100644
--- a/src/core/file_sys/system_archive/system_version.cpp
+++ b/src/core/file_sys/system_archive/system_version.cpp
@@ -3,7 +3,7 @@
 
 #include "common/logging/log.h"
 #include "core/file_sys/system_archive/system_version.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 #include "core/hle/api_version.h"
 
 namespace FileSys::SystemArchive {
diff --git a/src/core/file_sys/system_archive/system_version.h b/src/core/file_sys/system_archive/system_version.h
index 21b5514a9..e5f7b952e 100644
--- a/src/core/file_sys/system_archive/system_version.h
+++ b/src/core/file_sys/system_archive/system_version.h
@@ -4,7 +4,7 @@
 #pragma once
 
 #include <string>
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys::SystemArchive {
 
diff --git a/src/core/file_sys/system_archive/time_zone_binary.cpp b/src/core/file_sys/system_archive/time_zone_binary.cpp
index d4d2eae76..316ff0dc6 100644
--- a/src/core/file_sys/system_archive/time_zone_binary.cpp
+++ b/src/core/file_sys/system_archive/time_zone_binary.cpp
@@ -5,7 +5,7 @@
 
 #include "common/swap.h"
 #include "core/file_sys/system_archive/time_zone_binary.h"
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 #include "nx_tzdb.h"
 
diff --git a/src/core/file_sys/system_archive/time_zone_binary.h b/src/core/file_sys/system_archive/time_zone_binary.h
index d0e1a4acd..e44fc5007 100644
--- a/src/core/file_sys/system_archive/time_zone_binary.h
+++ b/src/core/file_sys/system_archive/time_zone_binary.h
@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys::SystemArchive {
 
diff --git a/src/core/file_sys/vfs.cpp b/src/core/file_sys/vfs/vfs.cpp
index b7105c8ff..a04292760 100644
--- a/src/core/file_sys/vfs.cpp
+++ b/src/core/file_sys/vfs/vfs.cpp
@@ -5,8 +5,7 @@
 #include <numeric>
 #include <string>
 #include "common/fs/path_util.h"
-#include "core/file_sys/mode.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
@@ -36,12 +35,12 @@ VfsEntryType VfsFilesystem::GetEntryType(std::string_view path_) const {
     return VfsEntryType::None;
 }
 
-VirtualFile VfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
+VirtualFile VfsFilesystem::OpenFile(std::string_view path_, OpenMode perms) {
     const auto path = Common::FS::SanitizePath(path_);
     return root->GetFileRelative(path);
 }
 
-VirtualFile VfsFilesystem::CreateFile(std::string_view path_, Mode perms) {
+VirtualFile VfsFilesystem::CreateFile(std::string_view path_, OpenMode perms) {
     const auto path = Common::FS::SanitizePath(path_);
     return root->CreateFileRelative(path);
 }
@@ -54,17 +53,17 @@ VirtualFile VfsFilesystem::CopyFile(std::string_view old_path_, std::string_view
     if (Common::FS::GetParentPath(old_path) == Common::FS::GetParentPath(new_path)) {
         if (!root->Copy(Common::FS::GetFilename(old_path), Common::FS::GetFilename(new_path)))
             return nullptr;
-        return OpenFile(new_path, Mode::ReadWrite);
+        return OpenFile(new_path, OpenMode::ReadWrite);
     }
 
     // Do it using RawCopy. Non-default impls are encouraged to optimize this.
-    const auto old_file = OpenFile(old_path, Mode::Read);
+    const auto old_file = OpenFile(old_path, OpenMode::Read);
     if (old_file == nullptr)
         return nullptr;
-    auto new_file = OpenFile(new_path, Mode::Read);
+    auto new_file = OpenFile(new_path, OpenMode::Read);
     if (new_file != nullptr)
         return nullptr;
-    new_file = CreateFile(new_path, Mode::Write);
+    new_file = CreateFile(new_path, OpenMode::Write);
     if (new_file == nullptr)
         return nullptr;
     if (!VfsRawCopy(old_file, new_file))
@@ -87,18 +86,18 @@ VirtualFile VfsFilesystem::MoveFile(std::string_view old_path, std::string_view
 
 bool VfsFilesystem::DeleteFile(std::string_view path_) {
     const auto path = Common::FS::SanitizePath(path_);
-    auto parent = OpenDirectory(Common::FS::GetParentPath(path), Mode::Write);
+    auto parent = OpenDirectory(Common::FS::GetParentPath(path), OpenMode::Write);
     if (parent == nullptr)
         return false;
     return parent->DeleteFile(Common::FS::GetFilename(path));
 }
 
-VirtualDir VfsFilesystem::OpenDirectory(std::string_view path_, Mode perms) {
+VirtualDir VfsFilesystem::OpenDirectory(std::string_view path_, OpenMode perms) {
     const auto path = Common::FS::SanitizePath(path_);
     return root->GetDirectoryRelative(path);
 }
 
-VirtualDir VfsFilesystem::CreateDirectory(std::string_view path_, Mode perms) {
+VirtualDir VfsFilesystem::CreateDirectory(std::string_view path_, OpenMode perms) {
     const auto path = Common::FS::SanitizePath(path_);
     return root->CreateDirectoryRelative(path);
 }
@@ -108,13 +107,13 @@ VirtualDir VfsFilesystem::CopyDirectory(std::string_view old_path_, std::string_
     const auto new_path = Common::FS::SanitizePath(new_path_);
 
     // Non-default impls are highly encouraged to provide a more optimized version of this.
-    auto old_dir = OpenDirectory(old_path, Mode::Read);
+    auto old_dir = OpenDirectory(old_path, OpenMode::Read);
     if (old_dir == nullptr)
         return nullptr;
-    auto new_dir = OpenDirectory(new_path, Mode::Read);
+    auto new_dir = OpenDirectory(new_path, OpenMode::Read);
     if (new_dir != nullptr)
         return nullptr;
-    new_dir = CreateDirectory(new_path, Mode::Write);
+    new_dir = CreateDirectory(new_path, OpenMode::Write);
     if (new_dir == nullptr)
         return nullptr;
 
@@ -149,7 +148,7 @@ VirtualDir VfsFilesystem::MoveDirectory(std::string_view old_path, std::string_v
 
 bool VfsFilesystem::DeleteDirectory(std::string_view path_) {
     const auto path = Common::FS::SanitizePath(path_);
-    auto parent = OpenDirectory(Common::FS::GetParentPath(path), Mode::Write);
+    auto parent = OpenDirectory(Common::FS::GetParentPath(path), OpenMode::Write);
     if (parent == nullptr)
         return false;
     return parent->DeleteSubdirectoryRecursive(Common::FS::GetFilename(path));
diff --git a/src/core/file_sys/vfs.h b/src/core/file_sys/vfs/vfs.h
index a7cd1cae3..f846a9669 100644
--- a/src/core/file_sys/vfs.h
+++ b/src/core/file_sys/vfs/vfs.h
@@ -13,12 +13,11 @@
 
 #include "common/common_funcs.h"
 #include "common/common_types.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys {
 
-enum class Mode : u32;
-
 // An enumeration representing what can be at the end of a path in a VfsFilesystem
 enum class VfsEntryType {
     None,
@@ -49,9 +48,9 @@ public:
     virtual VfsEntryType GetEntryType(std::string_view path) const;
 
     // Opens the file with path relative to root. If it doesn't exist, returns nullptr.
-    virtual VirtualFile OpenFile(std::string_view path, Mode perms);
+    virtual VirtualFile OpenFile(std::string_view path, OpenMode perms);
     // Creates a new, empty file at path
-    virtual VirtualFile CreateFile(std::string_view path, Mode perms);
+    virtual VirtualFile CreateFile(std::string_view path, OpenMode perms);
     // Copies the file from old_path to new_path, returning the new file on success and nullptr on
     // failure.
     virtual VirtualFile CopyFile(std::string_view old_path, std::string_view new_path);
@@ -62,9 +61,9 @@ public:
     virtual bool DeleteFile(std::string_view path);
 
     // Opens the directory with path relative to root. If it doesn't exist, returns nullptr.
-    virtual VirtualDir OpenDirectory(std::string_view path, Mode perms);
+    virtual VirtualDir OpenDirectory(std::string_view path, OpenMode perms);
     // Creates a new, empty directory at path
-    virtual VirtualDir CreateDirectory(std::string_view path, Mode perms);
+    virtual VirtualDir CreateDirectory(std::string_view path, OpenMode perms);
     // Copies the directory from old_path to new_path, returning the new directory on success and
     // nullptr on failure.
     virtual VirtualDir CopyDirectory(std::string_view old_path, std::string_view new_path);
diff --git a/src/core/file_sys/vfs_cached.cpp b/src/core/file_sys/vfs/vfs_cached.cpp
index 7ee5300e5..01cd0f1e0 100644
--- a/src/core/file_sys/vfs_cached.cpp
+++ b/src/core/file_sys/vfs/vfs_cached.cpp
@@ -1,8 +1,8 @@
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "core/file_sys/vfs_cached.h"
-#include "core/file_sys/vfs_types.h"
+#include "core/file_sys/vfs/vfs_cached.h"
+#include "core/file_sys/vfs/vfs_types.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_cached.h b/src/core/file_sys/vfs/vfs_cached.h
index 1e5300784..47dff7224 100644
--- a/src/core/file_sys/vfs_cached.h
+++ b/src/core/file_sys/vfs/vfs_cached.h
@@ -5,7 +5,7 @@
 
 #include <string_view>
 #include <vector>
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_concat.cpp b/src/core/file_sys/vfs/vfs_concat.cpp
index 7c7298527..b5cc9a9e9 100644
--- a/src/core/file_sys/vfs_concat.cpp
+++ b/src/core/file_sys/vfs/vfs_concat.cpp
@@ -5,8 +5,8 @@
 #include <utility>
 
 #include "common/assert.h"
-#include "core/file_sys/vfs_concat.h"
-#include "core/file_sys/vfs_static.h"
+#include "core/file_sys/vfs/vfs_concat.h"
+#include "core/file_sys/vfs/vfs_static.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_concat.h b/src/core/file_sys/vfs/vfs_concat.h
index b5f3d72e3..6d12af762 100644
--- a/src/core/file_sys/vfs_concat.h
+++ b/src/core/file_sys/vfs/vfs_concat.h
@@ -6,7 +6,7 @@
 #include <compare>
 #include <map>
 #include <memory>
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_layered.cpp b/src/core/file_sys/vfs/vfs_layered.cpp
index 5551743fb..47b2a3c78 100644
--- a/src/core/file_sys/vfs_layered.cpp
+++ b/src/core/file_sys/vfs/vfs_layered.cpp
@@ -5,7 +5,7 @@
 #include <set>
 #include <unordered_set>
 #include <utility>
-#include "core/file_sys/vfs_layered.h"
+#include "core/file_sys/vfs/vfs_layered.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_layered.h b/src/core/file_sys/vfs/vfs_layered.h
index a62112e9d..0027ffa9a 100644
--- a/src/core/file_sys/vfs_layered.h
+++ b/src/core/file_sys/vfs/vfs_layered.h
@@ -4,7 +4,7 @@
 #pragma once
 
 #include <memory>
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_offset.cpp b/src/core/file_sys/vfs/vfs_offset.cpp
index d950a6633..1a37d2670 100644
--- a/src/core/file_sys/vfs_offset.cpp
+++ b/src/core/file_sys/vfs/vfs_offset.cpp
@@ -4,7 +4,7 @@
 #include <algorithm>
 #include <utility>
 
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_offset.h b/src/core/file_sys/vfs/vfs_offset.h
index 6c051ca00..4abe41d8e 100644
--- a/src/core/file_sys/vfs_offset.h
+++ b/src/core/file_sys/vfs/vfs_offset.h
@@ -5,7 +5,7 @@
 
 #include <memory>
 
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_real.cpp b/src/core/file_sys/vfs/vfs_real.cpp
index cd9b79786..627d5d251 100644
--- a/src/core/file_sys/vfs_real.cpp
+++ b/src/core/file_sys/vfs/vfs_real.cpp
@@ -10,8 +10,8 @@
 #include "common/fs/fs.h"
 #include "common/fs/path_util.h"
 #include "common/logging/log.h"
-#include "core/file_sys/vfs.h"
-#include "core/file_sys/vfs_real.h"
+#include "core/file_sys/vfs/vfs.h"
+#include "core/file_sys/vfs/vfs_real.h"
 
 // For FileTimeStampRaw
 #include <sys/stat.h>
@@ -28,16 +28,14 @@ namespace {
 
 constexpr size_t MaxOpenFiles = 512;
 
-constexpr FS::FileAccessMode ModeFlagsToFileAccessMode(Mode mode) {
+constexpr FS::FileAccessMode ModeFlagsToFileAccessMode(OpenMode mode) {
     switch (mode) {
-    case Mode::Read:
+    case OpenMode::Read:
         return FS::FileAccessMode::Read;
-    case Mode::Write:
-    case Mode::ReadWrite:
-    case Mode::Append:
-    case Mode::ReadAppend:
-    case Mode::WriteAppend:
-    case Mode::All:
+    case OpenMode::Write:
+    case OpenMode::ReadWrite:
+    case OpenMode::AllowAppend:
+    case OpenMode::All:
         return FS::FileAccessMode::ReadWrite;
     default:
         return {};
@@ -74,7 +72,7 @@ VfsEntryType RealVfsFilesystem::GetEntryType(std::string_view path_) const {
 }
 
 VirtualFile RealVfsFilesystem::OpenFileFromEntry(std::string_view path_, std::optional<u64> size,
-                                                 Mode perms) {
+                                                 OpenMode perms) {
     const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
     std::scoped_lock lk{list_lock};
 
@@ -98,11 +96,11 @@ VirtualFile RealVfsFilesystem::OpenFileFromEntry(std::string_view path_, std::op
     return file;
 }
 
-VirtualFile RealVfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
+VirtualFile RealVfsFilesystem::OpenFile(std::string_view path_, OpenMode perms) {
     return OpenFileFromEntry(path_, {}, perms);
 }
 
-VirtualFile RealVfsFilesystem::CreateFile(std::string_view path_, Mode perms) {
+VirtualFile RealVfsFilesystem::CreateFile(std::string_view path_, OpenMode perms) {
     const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
     {
         std::scoped_lock lk{list_lock};
@@ -145,7 +143,7 @@ VirtualFile RealVfsFilesystem::MoveFile(std::string_view old_path_, std::string_
     if (!FS::RenameFile(old_path, new_path)) {
         return nullptr;
     }
-    return OpenFile(new_path, Mode::ReadWrite);
+    return OpenFile(new_path, OpenMode::ReadWrite);
 }
 
 bool RealVfsFilesystem::DeleteFile(std::string_view path_) {
@@ -157,12 +155,12 @@ bool RealVfsFilesystem::DeleteFile(std::string_view path_) {
     return FS::RemoveFile(path);
 }
 
-VirtualDir RealVfsFilesystem::OpenDirectory(std::string_view path_, Mode perms) {
+VirtualDir RealVfsFilesystem::OpenDirectory(std::string_view path_, OpenMode perms) {
     const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
     return std::shared_ptr<RealVfsDirectory>(new RealVfsDirectory(*this, path, perms));
 }
 
-VirtualDir RealVfsFilesystem::CreateDirectory(std::string_view path_, Mode perms) {
+VirtualDir RealVfsFilesystem::CreateDirectory(std::string_view path_, OpenMode perms) {
     const auto path = FS::SanitizePath(path_, FS::DirectorySeparator::PlatformDefault);
     if (!FS::CreateDirs(path)) {
         return nullptr;
@@ -184,7 +182,7 @@ VirtualDir RealVfsFilesystem::MoveDirectory(std::string_view old_path_,
     if (!FS::RenameDir(old_path, new_path)) {
         return nullptr;
     }
-    return OpenDirectory(new_path, Mode::ReadWrite);
+    return OpenDirectory(new_path, OpenMode::ReadWrite);
 }
 
 bool RealVfsFilesystem::DeleteDirectory(std::string_view path_) {
@@ -193,7 +191,7 @@ bool RealVfsFilesystem::DeleteDirectory(std::string_view path_) {
 }
 
 std::unique_lock<std::mutex> RealVfsFilesystem::RefreshReference(const std::string& path,
-                                                                 Mode perms,
+                                                                 OpenMode perms,
                                                                  FileReference& reference) {
     std::unique_lock lk{list_lock};
 
@@ -266,7 +264,7 @@ void RealVfsFilesystem::RemoveReferenceFromListLocked(FileReference& reference)
 }
 
 RealVfsFile::RealVfsFile(RealVfsFilesystem& base_, std::unique_ptr<FileReference> reference_,
-                         const std::string& path_, Mode perms_, std::optional<u64> size_)
+                         const std::string& path_, OpenMode perms_, std::optional<u64> size_)
     : base(base_), reference(std::move(reference_)), path(path_),
       parent_path(FS::GetParentPath(path_)), path_components(FS::SplitPathComponentsCopy(path_)),
       size(size_), perms(perms_) {}
@@ -298,11 +296,11 @@ VirtualDir RealVfsFile::GetContainingDirectory() const {
 }
 
 bool RealVfsFile::IsWritable() const {
-    return True(perms & Mode::Write);
+    return True(perms & OpenMode::Write);
 }
 
 bool RealVfsFile::IsReadable() const {
-    return True(perms & Mode::Read);
+    return True(perms & OpenMode::Read);
 }
 
 std::size_t RealVfsFile::Read(u8* data, std::size_t length, std::size_t offset) const {
@@ -331,7 +329,7 @@ bool RealVfsFile::Rename(std::string_view name) {
 
 template <>
 std::vector<VirtualFile> RealVfsDirectory::IterateEntries<RealVfsFile, VfsFile>() const {
-    if (perms == Mode::Append) {
+    if (perms == OpenMode::AllowAppend) {
         return {};
     }
 
@@ -353,7 +351,7 @@ std::vector<VirtualFile> RealVfsDirectory::IterateEntries<RealVfsFile, VfsFile>(
 
 template <>
 std::vector<VirtualDir> RealVfsDirectory::IterateEntries<RealVfsDirectory, VfsDirectory>() const {
-    if (perms == Mode::Append) {
+    if (perms == OpenMode::AllowAppend) {
         return {};
     }
 
@@ -373,10 +371,11 @@ std::vector<VirtualDir> RealVfsDirectory::IterateEntries<RealVfsDirectory, VfsDi
     return out;
 }
 
-RealVfsDirectory::RealVfsDirectory(RealVfsFilesystem& base_, const std::string& path_, Mode perms_)
+RealVfsDirectory::RealVfsDirectory(RealVfsFilesystem& base_, const std::string& path_,
+                                   OpenMode perms_)
     : base(base_), path(FS::RemoveTrailingSlash(path_)), parent_path(FS::GetParentPath(path)),
       path_components(FS::SplitPathComponentsCopy(path)), perms(perms_) {
-    if (!FS::Exists(path) && True(perms & Mode::Write)) {
+    if (!FS::Exists(path) && True(perms & OpenMode::Write)) {
         void(FS::CreateDirs(path));
     }
 }
@@ -456,11 +455,11 @@ std::vector<VirtualDir> RealVfsDirectory::GetSubdirectories() const {
 }
 
 bool RealVfsDirectory::IsWritable() const {
-    return True(perms & Mode::Write);
+    return True(perms & OpenMode::Write);
 }
 
 bool RealVfsDirectory::IsReadable() const {
-    return True(perms & Mode::Read);
+    return True(perms & OpenMode::Read);
 }
 
 std::string RealVfsDirectory::GetName() const {
@@ -507,7 +506,7 @@ std::string RealVfsDirectory::GetFullPath() const {
 }
 
 std::map<std::string, VfsEntryType, std::less<>> RealVfsDirectory::GetEntries() const {
-    if (perms == Mode::Append) {
+    if (perms == OpenMode::AllowAppend) {
         return {};
     }
 
diff --git a/src/core/file_sys/vfs_real.h b/src/core/file_sys/vfs/vfs_real.h
index 26ea7df62..5c2172cce 100644
--- a/src/core/file_sys/vfs_real.h
+++ b/src/core/file_sys/vfs/vfs_real.h
@@ -8,8 +8,8 @@
 #include <optional>
 #include <string_view>
 #include "common/intrusive_list.h"
-#include "core/file_sys/mode.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Common::FS {
 class IOFile;
@@ -33,13 +33,14 @@ public:
     bool IsReadable() const override;
     bool IsWritable() const override;
     VfsEntryType GetEntryType(std::string_view path) const override;
-    VirtualFile OpenFile(std::string_view path, Mode perms = Mode::Read) override;
-    VirtualFile CreateFile(std::string_view path, Mode perms = Mode::ReadWrite) override;
+    VirtualFile OpenFile(std::string_view path, OpenMode perms = OpenMode::Read) override;
+    VirtualFile CreateFile(std::string_view path, OpenMode perms = OpenMode::ReadWrite) override;
     VirtualFile CopyFile(std::string_view old_path, std::string_view new_path) override;
     VirtualFile MoveFile(std::string_view old_path, std::string_view new_path) override;
     bool DeleteFile(std::string_view path) override;
-    VirtualDir OpenDirectory(std::string_view path, Mode perms = Mode::Read) override;
-    VirtualDir CreateDirectory(std::string_view path, Mode perms = Mode::ReadWrite) override;
+    VirtualDir OpenDirectory(std::string_view path, OpenMode perms = OpenMode::Read) override;
+    VirtualDir CreateDirectory(std::string_view path,
+                               OpenMode perms = OpenMode::ReadWrite) override;
     VirtualDir CopyDirectory(std::string_view old_path, std::string_view new_path) override;
     VirtualDir MoveDirectory(std::string_view old_path, std::string_view new_path) override;
     bool DeleteDirectory(std::string_view path) override;
@@ -54,14 +55,14 @@ private:
 
 private:
     friend class RealVfsFile;
-    std::unique_lock<std::mutex> RefreshReference(const std::string& path, Mode perms,
+    std::unique_lock<std::mutex> RefreshReference(const std::string& path, OpenMode perms,
                                                   FileReference& reference);
     void DropReference(std::unique_ptr<FileReference>&& reference);
 
 private:
     friend class RealVfsDirectory;
     VirtualFile OpenFileFromEntry(std::string_view path, std::optional<u64> size,
-                                  Mode perms = Mode::Read);
+                                  OpenMode perms = OpenMode::Read);
 
 private:
     void EvictSingleReferenceLocked();
@@ -89,7 +90,8 @@ public:
 
 private:
     RealVfsFile(RealVfsFilesystem& base, std::unique_ptr<FileReference> reference,
-                const std::string& path, Mode perms = Mode::Read, std::optional<u64> size = {});
+                const std::string& path, OpenMode perms = OpenMode::Read,
+                std::optional<u64> size = {});
 
     RealVfsFilesystem& base;
     std::unique_ptr<FileReference> reference;
@@ -97,7 +99,7 @@ private:
     std::string parent_path;
     std::vector<std::string> path_components;
     std::optional<u64> size;
-    Mode perms;
+    OpenMode perms;
 };
 
 // An implementation of VfsDirectory that represents a directory on the user's computer.
@@ -130,7 +132,8 @@ public:
     std::map<std::string, VfsEntryType, std::less<>> GetEntries() const override;
 
 private:
-    RealVfsDirectory(RealVfsFilesystem& base, const std::string& path, Mode perms = Mode::Read);
+    RealVfsDirectory(RealVfsFilesystem& base, const std::string& path,
+                     OpenMode perms = OpenMode::Read);
 
     template <typename T, typename R>
     std::vector<std::shared_ptr<R>> IterateEntries() const;
@@ -139,7 +142,7 @@ private:
     std::string path;
     std::string parent_path;
     std::vector<std::string> path_components;
-    Mode perms;
+    OpenMode perms;
 };
 
 } // namespace FileSys
diff --git a/src/core/file_sys/vfs_static.h b/src/core/file_sys/vfs/vfs_static.h
index ca3f989ef..bb53560ac 100644
--- a/src/core/file_sys/vfs_static.h
+++ b/src/core/file_sys/vfs/vfs_static.h
@@ -7,7 +7,7 @@
 #include <memory>
 #include <string_view>
 
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/vfs_types.h b/src/core/file_sys/vfs/vfs_types.h
index 4a583ed64..4a583ed64 100644
--- a/src/core/file_sys/vfs_types.h
+++ b/src/core/file_sys/vfs/vfs_types.h
diff --git a/src/core/file_sys/vfs_vector.cpp b/src/core/file_sys/vfs/vfs_vector.cpp
index 251d9d7c9..0d54461c8 100644
--- a/src/core/file_sys/vfs_vector.cpp
+++ b/src/core/file_sys/vfs/vfs_vector.cpp
@@ -3,7 +3,7 @@
 
 #include <algorithm>
 #include <utility>
-#include "core/file_sys/vfs_vector.h"
+#include "core/file_sys/vfs/vfs_vector.h"
 
 namespace FileSys {
 VectorVfsFile::VectorVfsFile(std::vector<u8> initial_data, std::string name_, VirtualDir parent_)
diff --git a/src/core/file_sys/vfs_vector.h b/src/core/file_sys/vfs/vfs_vector.h
index bfedb6e42..587187dd2 100644
--- a/src/core/file_sys/vfs_vector.h
+++ b/src/core/file_sys/vfs/vfs_vector.h
@@ -8,7 +8,7 @@
 #include <memory>
 #include <string>
 #include <vector>
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace FileSys {
 
diff --git a/src/core/file_sys/xts_archive.cpp b/src/core/file_sys/xts_archive.cpp
index ede0aa11a..6692211e1 100644
--- a/src/core/file_sys/xts_archive.cpp
+++ b/src/core/file_sys/xts_archive.cpp
@@ -17,7 +17,7 @@
 #include "core/crypto/key_manager.h"
 #include "core/crypto/xts_encryption_layer.h"
 #include "core/file_sys/content_archive.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 #include "core/file_sys/xts_archive.h"
 #include "core/loader/loader.h"
 
diff --git a/src/core/file_sys/xts_archive.h b/src/core/file_sys/xts_archive.h
index abbe5f716..7589b7c38 100644
--- a/src/core/file_sys/xts_archive.h
+++ b/src/core/file_sys/xts_archive.h
@@ -8,7 +8,7 @@
 #include "common/common_types.h"
 #include "common/swap.h"
 #include "core/crypto/key_manager.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Loader {
 enum class ResultStatus : u16;
diff --git a/src/core/frontend/applets/error.cpp b/src/core/frontend/applets/error.cpp
index 2e6f7a3d9..53d4be2e5 100644
--- a/src/core/frontend/applets/error.cpp
+++ b/src/core/frontend/applets/error.cpp
@@ -12,7 +12,7 @@ void DefaultErrorApplet::Close() const {}
 
 void DefaultErrorApplet::ShowError(Result error, FinishedCallback finished) const {
     LOG_CRITICAL(Service_Fatal, "Application requested error display: {:04}-{:04} (raw={:08X})",
-                 error.module.Value(), error.description.Value(), error.raw);
+                 error.GetModule(), error.GetDescription(), error.raw);
 }
 
 void DefaultErrorApplet::ShowErrorWithTimestamp(Result error, std::chrono::seconds time,
@@ -20,7 +20,7 @@ void DefaultErrorApplet::ShowErrorWithTimestamp(Result error, std::chrono::secon
     LOG_CRITICAL(
         Service_Fatal,
         "Application requested error display: {:04X}-{:04X} (raw={:08X}) with timestamp={:016X}",
-        error.module.Value(), error.description.Value(), error.raw, time.count());
+        error.GetModule(), error.GetDescription(), error.raw, time.count());
 }
 
 void DefaultErrorApplet::ShowCustomErrorText(Result error, std::string main_text,
@@ -28,7 +28,7 @@ void DefaultErrorApplet::ShowCustomErrorText(Result error, std::string main_text
                                              FinishedCallback finished) const {
     LOG_CRITICAL(Service_Fatal,
                  "Application requested custom error with error_code={:04X}-{:04X} (raw={:08X})",
-                 error.module.Value(), error.description.Value(), error.raw);
+                 error.GetModule(), error.GetDescription(), error.raw);
     LOG_CRITICAL(Service_Fatal, "    Main Text: {}", main_text);
     LOG_CRITICAL(Service_Fatal, "    Detail Text: {}", detail_text);
 }
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));
diff --git a/src/core/loader/loader.h b/src/core/loader/loader.h
index b4828f7cd..f4e932cec 100644
--- a/src/core/loader/loader.h
+++ b/src/core/loader/loader.h
@@ -14,7 +14,7 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "core/file_sys/control_metadata.h"
-#include "core/file_sys/vfs.h"
+#include "core/file_sys/vfs/vfs.h"
 
 namespace Core {
 class System;
diff --git a/src/core/loader/nro.cpp b/src/core/loader/nro.cpp
index f8225d697..1d96dc4c8 100644
--- a/src/core/loader/nro.cpp
+++ b/src/core/loader/nro.cpp
@@ -12,7 +12,7 @@
 #include "core/core.h"
 #include "core/file_sys/control_metadata.h"
 #include "core/file_sys/romfs_factory.h"
-#include "core/file_sys/vfs_offset.h"
+#include "core/file_sys/vfs/vfs_offset.h"
 #include "core/hle/kernel/code_set.h"
 #include "core/hle/kernel/k_page_table.h"
 #include "core/hle/kernel/k_process.h"
diff --git a/src/core/reporter.cpp b/src/core/reporter.cpp
index dc3883528..1a0138697 100644
--- a/src/core/reporter.cpp
+++ b/src/core/reporter.cpp
@@ -68,8 +68,8 @@ json GetReportCommonData(u64 title_id, Result result, const std::string& timesta
     auto out = json{
         {"title_id", fmt::format("{:016X}", title_id)},
         {"result_raw", fmt::format("{:08X}", result.raw)},
-        {"result_module", fmt::format("{:08X}", static_cast<u32>(result.module.Value()))},
-        {"result_description", fmt::format("{:08X}", result.description.Value())},
+        {"result_module", fmt::format("{:08X}", static_cast<u32>(result.GetModule()))},
+        {"result_description", fmt::format("{:08X}", result.GetDescription())},
         {"timestamp", timestamp},
     };