15 files changed, 1556 insertions, 0 deletions
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..62512ad0f
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_directory.cpp
@@ -0,0 +1,79 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#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::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());
+    }
+}
+
+IDirectory::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);
+    }
+}
+
+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::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 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..2a28ee496
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_directory.h
@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/vfs.h"
+#include "core/hle/service/filesystem/filesystem.h"
+#include "core/hle/service/filesystem/fsp_util.h"
+#include "core/hle/service/service.h"
+
+namespace Service::FileSystem {
+
+class IDirectory final : public ServiceFramework<IDirectory> {
+public:
+    explicit IDirectory(Core::System& system_, FileSys::VirtualDir backend_,
+                        OpenDirectoryMode mode);
+
+private:
+    FileSys::VirtualDir backend;
+    std::vector<FileSys::Entry> 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..7e0c90a89
--- /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::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 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::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 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..a7eb1a1e9
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fs_i_file.h
@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/vfs.h"
+#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..3e72101a4
--- /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::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 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<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::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 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..c9e94c911
--- /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.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..9fe36f31a
--- /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::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 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..48d059874
--- /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.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/fsp_ldr.cpp b/src/core/hle/service/filesystem/fsp/fsp_ldr.cpp
new file mode 100644
index 000000000..8ee733f47
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fsp_ldr.cpp
@@ -0,0 +1,22 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/filesystem/fsp/fsp_ldr.h"
+
+namespace Service::FileSystem {
+
+FSP_LDR::FSP_LDR(Core::System& system_) : ServiceFramework{system_, "fsp:ldr"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "OpenCodeFileSystem"},
+        {1, nullptr, "IsArchivedProgram"},
+        {2, nullptr, "SetCurrentProcess"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+FSP_LDR::~FSP_LDR() = default;
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fsp_ldr.h b/src/core/hle/service/filesystem/fsp/fsp_ldr.h
new file mode 100644
index 000000000..358739a87
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fsp_ldr.h
@@ -0,0 +1,20 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Core {
+class System;
+}
+
+namespace Service::FileSystem {
+
+class FSP_LDR final : public ServiceFramework<FSP_LDR> {
+public:
+    explicit FSP_LDR(Core::System& system_);
+    ~FSP_LDR() override;
+};
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fsp_pr.cpp b/src/core/hle/service/filesystem/fsp/fsp_pr.cpp
new file mode 100644
index 000000000..7c03ebaea
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fsp_pr.cpp
@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/filesystem/fsp/fsp_pr.h"
+
+namespace Service::FileSystem {
+
+FSP_PR::FSP_PR(Core::System& system_) : ServiceFramework{system_, "fsp:pr"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "RegisterProgram"},
+        {1, nullptr, "UnregisterProgram"},
+        {2, nullptr, "SetCurrentProcess"},
+        {256, nullptr, "SetEnabledProgramVerification"},
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+FSP_PR::~FSP_PR() = default;
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fsp_pr.h b/src/core/hle/service/filesystem/fsp/fsp_pr.h
new file mode 100644
index 000000000..bd4e0a730
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fsp_pr.h
@@ -0,0 +1,20 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Core {
+class System;
+}
+
+namespace Service::FileSystem {
+
+class FSP_PR final : public ServiceFramework<FSP_PR> {
+public:
+    explicit FSP_PR(Core::System& system_);
+    ~FSP_PR() override;
+};
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fsp_srv.cpp b/src/core/hle/service/filesystem/fsp/fsp_srv.cpp
new file mode 100644
index 000000000..85ab75517
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fsp_srv.cpp
@@ -0,0 +1,727 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <cinttypes>
+#include <cstring>
+#include <iterator>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "common/hex_util.h"
+#include "common/logging/log.h"
+#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/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/hle/result.h"
+#include "core/hle/service/filesystem/filesystem.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"
+#include "core/hle/service/ipc_helpers.h"
+#include "core/reporter.h"
+
+namespace Service::FileSystem {
+enum class FileSystemType : u8 {
+    Invalid0 = 0,
+    Invalid1 = 1,
+    Logo = 2,
+    ContentControl = 3,
+    ContentManual = 4,
+    ContentMeta = 5,
+    ContentData = 6,
+    ApplicationPackage = 7,
+};
+
+class ISaveDataInfoReader final : public ServiceFramework<ISaveDataInfoReader> {
+public:
+    explicit ISaveDataInfoReader(Core::System& system_,
+                                 std::shared_ptr<SaveDataController> save_data_controller_,
+                                 FileSys::SaveDataSpaceId space)
+        : ServiceFramework{system_, "ISaveDataInfoReader"},
+          save_data_controller{save_data_controller_} {
+        static const FunctionInfo functions[] = {
+            {0, &ISaveDataInfoReader::ReadSaveDataInfo, "ReadSaveDataInfo"},
+        };
+        RegisterHandlers(functions);
+
+        FindAllSaves(space);
+    }
+
+    void ReadSaveDataInfo(HLERequestContext& ctx) {
+        LOG_DEBUG(Service_FS, "called");
+
+        // Calculate how many entries we can fit in the output buffer
+        const u64 count_entries = ctx.GetWriteBufferNumElements<SaveDataInfo>();
+
+        // Cap at total number of entries.
+        const u64 actual_entries = std::min(count_entries, info.size() - next_entry_index);
+
+        // Determine data start and end
+        const auto* begin = reinterpret_cast<u8*>(info.data() + next_entry_index);
+        const auto* end = reinterpret_cast<u8*>(info.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<u64>(actual_entries);
+    }
+
+private:
+    static u64 stoull_be(std::string_view str) {
+        if (str.size() != 16)
+            return 0;
+
+        const auto bytes = Common::HexStringToArray<0x8>(str);
+        u64 out{};
+        std::memcpy(&out, bytes.data(), sizeof(u64));
+
+        return Common::swap64(out);
+    }
+
+    void FindAllSaves(FileSys::SaveDataSpaceId space) {
+        FileSys::VirtualDir save_root{};
+        const auto result = save_data_controller->OpenSaveDataSpace(&save_root, space);
+
+        if (result != ResultSuccess || save_root == nullptr) {
+            LOG_ERROR(Service_FS, "The save root for the space_id={:02X} was invalid!", space);
+            return;
+        }
+
+        for (const auto& type : save_root->GetSubdirectories()) {
+            if (type->GetName() == "save") {
+                for (const auto& save_id : type->GetSubdirectories()) {
+                    for (const auto& user_id : save_id->GetSubdirectories()) {
+                        const auto save_id_numeric = stoull_be(save_id->GetName());
+                        auto user_id_numeric = Common::HexStringToArray<0x10>(user_id->GetName());
+                        std::reverse(user_id_numeric.begin(), user_id_numeric.end());
+
+                        if (save_id_numeric != 0) {
+                            // System Save Data
+                            info.emplace_back(SaveDataInfo{
+                                0,
+                                space,
+                                FileSys::SaveDataType::SystemSaveData,
+                                {},
+                                user_id_numeric,
+                                save_id_numeric,
+                                0,
+                                user_id->GetSize(),
+                                {},
+                                {},
+                            });
+
+                            continue;
+                        }
+
+                        for (const auto& title_id : user_id->GetSubdirectories()) {
+                            const auto device =
+                                std::all_of(user_id_numeric.begin(), user_id_numeric.end(),
+                                            [](u8 val) { return val == 0; });
+                            info.emplace_back(SaveDataInfo{
+                                0,
+                                space,
+                                device ? FileSys::SaveDataType::DeviceSaveData
+                                       : FileSys::SaveDataType::SaveData,
+                                {},
+                                user_id_numeric,
+                                save_id_numeric,
+                                stoull_be(title_id->GetName()),
+                                title_id->GetSize(),
+                                {},
+                                {},
+                            });
+                        }
+                    }
+                }
+            } else if (space == FileSys::SaveDataSpaceId::TemporaryStorage) {
+                // Temporary Storage
+                for (const auto& user_id : type->GetSubdirectories()) {
+                    for (const auto& title_id : user_id->GetSubdirectories()) {
+                        if (!title_id->GetFiles().empty() ||
+                            !title_id->GetSubdirectories().empty()) {
+                            auto user_id_numeric =
+                                Common::HexStringToArray<0x10>(user_id->GetName());
+                            std::reverse(user_id_numeric.begin(), user_id_numeric.end());
+
+                            info.emplace_back(SaveDataInfo{
+                                0,
+                                space,
+                                FileSys::SaveDataType::TemporaryStorage,
+                                {},
+                                user_id_numeric,
+                                stoull_be(type->GetName()),
+                                stoull_be(title_id->GetName()),
+                                title_id->GetSize(),
+                                {},
+                                {},
+                            });
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    struct SaveDataInfo {
+        u64_le save_id_unknown;
+        FileSys::SaveDataSpaceId space;
+        FileSys::SaveDataType type;
+        INSERT_PADDING_BYTES(0x6);
+        std::array<u8, 0x10> user_id;
+        u64_le save_id;
+        u64_le title_id;
+        u64_le save_image_size;
+        u16_le index;
+        FileSys::SaveDataRank rank;
+        INSERT_PADDING_BYTES(0x25);
+    };
+    static_assert(sizeof(SaveDataInfo) == 0x60, "SaveDataInfo has incorrect size.");
+
+    ProcessId process_id = 0;
+    std::shared_ptr<SaveDataController> save_data_controller;
+    std::vector<SaveDataInfo> info;
+    u64 next_entry_index = 0;
+};
+
+FSP_SRV::FSP_SRV(Core::System& system_)
+    : ServiceFramework{system_, "fsp-srv"}, fsc{system.GetFileSystemController()},
+      content_provider{system.GetContentProvider()}, reporter{system.GetReporter()} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "OpenFileSystem"},
+        {1, &FSP_SRV::SetCurrentProcess, "SetCurrentProcess"},
+        {2, nullptr, "OpenDataFileSystemByCurrentProcess"},
+        {7, &FSP_SRV::OpenFileSystemWithPatch, "OpenFileSystemWithPatch"},
+        {8, nullptr, "OpenFileSystemWithId"},
+        {9, nullptr, "OpenDataFileSystemByApplicationId"},
+        {11, nullptr, "OpenBisFileSystem"},
+        {12, nullptr, "OpenBisStorage"},
+        {13, nullptr, "InvalidateBisCache"},
+        {17, nullptr, "OpenHostFileSystem"},
+        {18, &FSP_SRV::OpenSdCardFileSystem, "OpenSdCardFileSystem"},
+        {19, nullptr, "FormatSdCardFileSystem"},
+        {21, nullptr, "DeleteSaveDataFileSystem"},
+        {22, &FSP_SRV::CreateSaveDataFileSystem, "CreateSaveDataFileSystem"},
+        {23, &FSP_SRV::CreateSaveDataFileSystemBySystemSaveDataId, "CreateSaveDataFileSystemBySystemSaveDataId"},
+        {24, nullptr, "RegisterSaveDataFileSystemAtomicDeletion"},
+        {25, nullptr, "DeleteSaveDataFileSystemBySaveDataSpaceId"},
+        {26, nullptr, "FormatSdCardDryRun"},
+        {27, nullptr, "IsExFatSupported"},
+        {28, nullptr, "DeleteSaveDataFileSystemBySaveDataAttribute"},
+        {30, nullptr, "OpenGameCardStorage"},
+        {31, nullptr, "OpenGameCardFileSystem"},
+        {32, nullptr, "ExtendSaveDataFileSystem"},
+        {33, nullptr, "DeleteCacheStorage"},
+        {34, &FSP_SRV::GetCacheStorageSize, "GetCacheStorageSize"},
+        {35, nullptr, "CreateSaveDataFileSystemByHashSalt"},
+        {36, nullptr, "OpenHostFileSystemWithOption"},
+        {51, &FSP_SRV::OpenSaveDataFileSystem, "OpenSaveDataFileSystem"},
+        {52, &FSP_SRV::OpenSaveDataFileSystemBySystemSaveDataId, "OpenSaveDataFileSystemBySystemSaveDataId"},
+        {53, &FSP_SRV::OpenReadOnlySaveDataFileSystem, "OpenReadOnlySaveDataFileSystem"},
+        {57, nullptr, "ReadSaveDataFileSystemExtraDataBySaveDataSpaceId"},
+        {58, nullptr, "ReadSaveDataFileSystemExtraData"},
+        {59, nullptr, "WriteSaveDataFileSystemExtraData"},
+        {60, nullptr, "OpenSaveDataInfoReader"},
+        {61, &FSP_SRV::OpenSaveDataInfoReaderBySaveDataSpaceId, "OpenSaveDataInfoReaderBySaveDataSpaceId"},
+        {62, &FSP_SRV::OpenSaveDataInfoReaderOnlyCacheStorage, "OpenSaveDataInfoReaderOnlyCacheStorage"},
+        {64, nullptr, "OpenSaveDataInternalStorageFileSystem"},
+        {65, nullptr, "UpdateSaveDataMacForDebug"},
+        {66, nullptr, "WriteSaveDataFileSystemExtraData2"},
+        {67, nullptr, "FindSaveDataWithFilter"},
+        {68, nullptr, "OpenSaveDataInfoReaderBySaveDataFilter"},
+        {69, nullptr, "ReadSaveDataFileSystemExtraDataBySaveDataAttribute"},
+        {70, &FSP_SRV::WriteSaveDataFileSystemExtraDataBySaveDataAttribute, "WriteSaveDataFileSystemExtraDataBySaveDataAttribute"},
+        {71, &FSP_SRV::ReadSaveDataFileSystemExtraDataWithMaskBySaveDataAttribute, "ReadSaveDataFileSystemExtraDataWithMaskBySaveDataAttribute"},
+        {80, nullptr, "OpenSaveDataMetaFile"},
+        {81, nullptr, "OpenSaveDataTransferManager"},
+        {82, nullptr, "OpenSaveDataTransferManagerVersion2"},
+        {83, nullptr, "OpenSaveDataTransferProhibiterForCloudBackUp"},
+        {84, nullptr, "ListApplicationAccessibleSaveDataOwnerId"},
+        {85, nullptr, "OpenSaveDataTransferManagerForSaveDataRepair"},
+        {86, nullptr, "OpenSaveDataMover"},
+        {87, nullptr, "OpenSaveDataTransferManagerForRepair"},
+        {100, nullptr, "OpenImageDirectoryFileSystem"},
+        {101, nullptr, "OpenBaseFileSystem"},
+        {102, nullptr, "FormatBaseFileSystem"},
+        {110, nullptr, "OpenContentStorageFileSystem"},
+        {120, nullptr, "OpenCloudBackupWorkStorageFileSystem"},
+        {130, nullptr, "OpenCustomStorageFileSystem"},
+        {200, &FSP_SRV::OpenDataStorageByCurrentProcess, "OpenDataStorageByCurrentProcess"},
+        {201, nullptr, "OpenDataStorageByProgramId"},
+        {202, &FSP_SRV::OpenDataStorageByDataId, "OpenDataStorageByDataId"},
+        {203, &FSP_SRV::OpenPatchDataStorageByCurrentProcess, "OpenPatchDataStorageByCurrentProcess"},
+        {204, nullptr, "OpenDataFileSystemByProgramIndex"},
+        {205, &FSP_SRV::OpenDataStorageWithProgramIndex, "OpenDataStorageWithProgramIndex"},
+        {206, nullptr, "OpenDataStorageByPath"},
+        {400, nullptr, "OpenDeviceOperator"},
+        {500, nullptr, "OpenSdCardDetectionEventNotifier"},
+        {501, nullptr, "OpenGameCardDetectionEventNotifier"},
+        {510, nullptr, "OpenSystemDataUpdateEventNotifier"},
+        {511, nullptr, "NotifySystemDataUpdateEvent"},
+        {520, nullptr, "SimulateGameCardDetectionEvent"},
+        {600, nullptr, "SetCurrentPosixTime"},
+        {601, nullptr, "QuerySaveDataTotalSize"},
+        {602, nullptr, "VerifySaveDataFileSystem"},
+        {603, nullptr, "CorruptSaveDataFileSystem"},
+        {604, nullptr, "CreatePaddingFile"},
+        {605, nullptr, "DeleteAllPaddingFiles"},
+        {606, nullptr, "GetRightsId"},
+        {607, nullptr, "RegisterExternalKey"},
+        {608, nullptr, "UnregisterAllExternalKey"},
+        {609, nullptr, "GetRightsIdByPath"},
+        {610, nullptr, "GetRightsIdAndKeyGenerationByPath"},
+        {611, nullptr, "SetCurrentPosixTimeWithTimeDifference"},
+        {612, nullptr, "GetFreeSpaceSizeForSaveData"},
+        {613, nullptr, "VerifySaveDataFileSystemBySaveDataSpaceId"},
+        {614, nullptr, "CorruptSaveDataFileSystemBySaveDataSpaceId"},
+        {615, nullptr, "QuerySaveDataInternalStorageTotalSize"},
+        {616, nullptr, "GetSaveDataCommitId"},
+        {617, nullptr, "UnregisterExternalKey"},
+        {620, nullptr, "SetSdCardEncryptionSeed"},
+        {630, nullptr, "SetSdCardAccessibility"},
+        {631, nullptr, "IsSdCardAccessible"},
+        {640, nullptr, "IsSignedSystemPartitionOnSdCardValid"},
+        {700, nullptr, "OpenAccessFailureResolver"},
+        {701, nullptr, "GetAccessFailureDetectionEvent"},
+        {702, nullptr, "IsAccessFailureDetected"},
+        {710, nullptr, "ResolveAccessFailure"},
+        {720, nullptr, "AbandonAccessFailure"},
+        {800, nullptr, "GetAndClearFileSystemProxyErrorInfo"},
+        {810, nullptr, "RegisterProgramIndexMapInfo"},
+        {1000, nullptr, "SetBisRootForHost"},
+        {1001, nullptr, "SetSaveDataSize"},
+        {1002, nullptr, "SetSaveDataRootPath"},
+        {1003, &FSP_SRV::DisableAutoSaveDataCreation, "DisableAutoSaveDataCreation"},
+        {1004, &FSP_SRV::SetGlobalAccessLogMode, "SetGlobalAccessLogMode"},
+        {1005, &FSP_SRV::GetGlobalAccessLogMode, "GetGlobalAccessLogMode"},
+        {1006, &FSP_SRV::OutputAccessLogToSdCard, "OutputAccessLogToSdCard"},
+        {1007, nullptr, "RegisterUpdatePartition"},
+        {1008, nullptr, "OpenRegisteredUpdatePartition"},
+        {1009, nullptr, "GetAndClearMemoryReportInfo"},
+        {1010, nullptr, "SetDataStorageRedirectTarget"},
+        {1011, &FSP_SRV::GetProgramIndexForAccessLog, "GetProgramIndexForAccessLog"},
+        {1012, nullptr, "GetFsStackUsage"},
+        {1013, nullptr, "UnsetSaveDataRootPath"},
+        {1014, nullptr, "OutputMultiProgramTagAccessLog"},
+        {1016, nullptr, "FlushAccessLogOnSdCard"},
+        {1017, nullptr, "OutputApplicationInfoAccessLog"},
+        {1018, nullptr, "SetDebugOption"},
+        {1019, nullptr, "UnsetDebugOption"},
+        {1100, nullptr, "OverrideSaveDataTransferTokenSignVerificationKey"},
+        {1110, nullptr, "CorruptSaveDataFileSystemBySaveDataSpaceId2"},
+        {1200, &FSP_SRV::OpenMultiCommitManager, "OpenMultiCommitManager"},
+        {1300, nullptr, "OpenBisWiper"},
+    };
+    // clang-format on
+    RegisterHandlers(functions);
+
+    if (Settings::values.enable_fs_access_log) {
+        access_log_mode = AccessLogMode::SdCard;
+    }
+}
+
+FSP_SRV::~FSP_SRV() = default;
+
+void FSP_SRV::SetCurrentProcess(HLERequestContext& ctx) {
+    current_process_id = ctx.GetPID();
+
+    LOG_DEBUG(Service_FS, "called. current_process_id=0x{:016X}", current_process_id);
+
+    const auto res =
+        fsc.OpenProcess(&program_id, &save_data_controller, &romfs_controller, current_process_id);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(res);
+}
+
+void FSP_SRV::OpenFileSystemWithPatch(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const auto type = rp.PopRaw<FileSystemType>();
+    const auto title_id = rp.PopRaw<u64>();
+    LOG_WARNING(Service_FS, "(STUBBED) called with type={}, title_id={:016X}", type, title_id);
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 0};
+    rb.Push(ResultUnknown);
+}
+
+void FSP_SRV::OpenSdCardFileSystem(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    FileSys::VirtualDir sdmc_dir{};
+    fsc.OpenSDMC(&sdmc_dir);
+
+    auto filesystem = std::make_shared<IFileSystem>(
+        system, sdmc_dir, SizeGetter::FromStorageId(fsc, FileSys::StorageId::SdCard));
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<IFileSystem>(std::move(filesystem));
+}
+
+void FSP_SRV::CreateSaveDataFileSystem(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    auto save_struct = rp.PopRaw<FileSys::SaveDataAttribute>();
+    [[maybe_unused]] auto save_create_struct = rp.PopRaw<std::array<u8, 0x40>>();
+    u128 uid = rp.PopRaw<u128>();
+
+    LOG_DEBUG(Service_FS, "called save_struct = {}, uid = {:016X}{:016X}", save_struct.DebugInfo(),
+              uid[1], uid[0]);
+
+    FileSys::VirtualDir save_data_dir{};
+    save_data_controller->CreateSaveData(&save_data_dir, FileSys::SaveDataSpaceId::NandUser,
+                                         save_struct);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void FSP_SRV::CreateSaveDataFileSystemBySystemSaveDataId(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    auto save_struct = rp.PopRaw<FileSys::SaveDataAttribute>();
+    [[maybe_unused]] auto save_create_struct = rp.PopRaw<std::array<u8, 0x40>>();
+
+    LOG_DEBUG(Service_FS, "called save_struct = {}", save_struct.DebugInfo());
+
+    FileSys::VirtualDir save_data_dir{};
+    save_data_controller->CreateSaveData(&save_data_dir, FileSys::SaveDataSpaceId::NandSystem,
+                                         save_struct);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void FSP_SRV::OpenSaveDataFileSystem(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    struct Parameters {
+        FileSys::SaveDataSpaceId space_id;
+        FileSys::SaveDataAttribute attribute;
+    };
+
+    const auto parameters = rp.PopRaw<Parameters>();
+
+    LOG_INFO(Service_FS, "called.");
+
+    FileSys::VirtualDir dir{};
+    auto result =
+        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);
+        return;
+    }
+
+    FileSys::StorageId id{};
+    switch (parameters.space_id) {
+    case FileSys::SaveDataSpaceId::NandUser:
+        id = FileSys::StorageId::NandUser;
+        break;
+    case FileSys::SaveDataSpaceId::SdCardSystem:
+    case FileSys::SaveDataSpaceId::SdCardUser:
+        id = FileSys::StorageId::SdCard;
+        break;
+    case FileSys::SaveDataSpaceId::NandSystem:
+        id = FileSys::StorageId::NandSystem;
+        break;
+    case FileSys::SaveDataSpaceId::TemporaryStorage:
+    case FileSys::SaveDataSpaceId::ProperSystem:
+    case FileSys::SaveDataSpaceId::SafeMode:
+        ASSERT(false);
+    }
+
+    auto filesystem =
+        std::make_shared<IFileSystem>(system, std::move(dir), SizeGetter::FromStorageId(fsc, id));
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<IFileSystem>(std::move(filesystem));
+}
+
+void FSP_SRV::OpenSaveDataFileSystemBySystemSaveDataId(HLERequestContext& ctx) {
+    LOG_WARNING(Service_FS, "(STUBBED) called, delegating to 51 OpenSaveDataFilesystem");
+    OpenSaveDataFileSystem(ctx);
+}
+
+void FSP_SRV::OpenReadOnlySaveDataFileSystem(HLERequestContext& ctx) {
+    LOG_WARNING(Service_FS, "(STUBBED) called, delegating to 51 OpenSaveDataFilesystem");
+    OpenSaveDataFileSystem(ctx);
+}
+
+void FSP_SRV::OpenSaveDataInfoReaderBySaveDataSpaceId(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto space = rp.PopRaw<FileSys::SaveDataSpaceId>();
+    LOG_INFO(Service_FS, "called, space={}", space);
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<ISaveDataInfoReader>(
+        std::make_shared<ISaveDataInfoReader>(system, save_data_controller, space));
+}
+
+void FSP_SRV::OpenSaveDataInfoReaderOnlyCacheStorage(HLERequestContext& ctx) {
+    LOG_WARNING(Service_FS, "(STUBBED) called");
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<ISaveDataInfoReader>(system, save_data_controller,
+                                             FileSys::SaveDataSpaceId::TemporaryStorage);
+}
+
+void FSP_SRV::WriteSaveDataFileSystemExtraDataBySaveDataAttribute(HLERequestContext& ctx) {
+    LOG_WARNING(Service_FS, "(STUBBED) called.");
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void FSP_SRV::ReadSaveDataFileSystemExtraDataWithMaskBySaveDataAttribute(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    struct Parameters {
+        FileSys::SaveDataSpaceId space_id;
+        FileSys::SaveDataAttribute attribute;
+    };
+
+    const auto parameters = rp.PopRaw<Parameters>();
+    // Stub this to None for now, backend needs an impl to read/write the SaveDataExtraData
+    constexpr auto flags = static_cast<u32>(FileSys::SaveDataFlags::None);
+
+    LOG_WARNING(Service_FS,
+                "(STUBBED) called, flags={}, space_id={}, attribute.title_id={:016X}\n"
+                "attribute.user_id={:016X}{:016X}, attribute.save_id={:016X}\n"
+                "attribute.type={}, attribute.rank={}, attribute.index={}",
+                flags, parameters.space_id, parameters.attribute.title_id,
+                parameters.attribute.user_id[1], parameters.attribute.user_id[0],
+                parameters.attribute.save_id, parameters.attribute.type, parameters.attribute.rank,
+                parameters.attribute.index);
+
+    IPC::ResponseBuilder rb{ctx, 3};
+    rb.Push(ResultSuccess);
+    rb.Push(flags);
+}
+
+void FSP_SRV::OpenDataStorageByCurrentProcess(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    if (!romfs) {
+        auto current_romfs = romfs_controller->OpenRomFSCurrentProcess();
+        if (!current_romfs) {
+            // TODO (bunnei): Find the right error code to use here
+            LOG_CRITICAL(Service_FS, "no file system interface available!");
+            IPC::ResponseBuilder rb{ctx, 2};
+            rb.Push(ResultUnknown);
+            return;
+        }
+
+        romfs = current_romfs;
+    }
+
+    auto storage = std::make_shared<IStorage>(system, romfs);
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<IStorage>(std::move(storage));
+}
+
+void FSP_SRV::OpenDataStorageByDataId(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto storage_id = rp.PopRaw<FileSys::StorageId>();
+    const auto unknown = rp.PopRaw<u32>();
+    const auto title_id = rp.PopRaw<u64>();
+
+    LOG_DEBUG(Service_FS, "called with storage_id={:02X}, unknown={:08X}, title_id={:016X}",
+              storage_id, unknown, title_id);
+
+    auto data = romfs_controller->OpenRomFS(title_id, storage_id, FileSys::ContentRecordType::Data);
+
+    if (!data) {
+        const auto archive = FileSys::SystemArchive::SynthesizeSystemArchive(title_id);
+
+        if (archive != nullptr) {
+            IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+            rb.Push(ResultSuccess);
+            rb.PushIpcInterface(std::make_shared<IStorage>(system, archive));
+            return;
+        }
+
+        // TODO(DarkLordZach): Find the right error code to use here
+        LOG_ERROR(Service_FS,
+                  "could not open data storage with title_id={:016X}, storage_id={:02X}", title_id,
+                  storage_id);
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultUnknown);
+        return;
+    }
+
+    const FileSys::PatchManager pm{title_id, fsc, content_provider};
+
+    auto base =
+        romfs_controller->OpenBaseNca(title_id, storage_id, FileSys::ContentRecordType::Data);
+    auto storage = std::make_shared<IStorage>(
+        system, pm.PatchRomFS(base.get(), std::move(data), FileSys::ContentRecordType::Data));
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<IStorage>(std::move(storage));
+}
+
+void FSP_SRV::OpenPatchDataStorageByCurrentProcess(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const auto storage_id = rp.PopRaw<FileSys::StorageId>();
+    const auto title_id = rp.PopRaw<u64>();
+
+    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);
+}
+
+void FSP_SRV::OpenDataStorageWithProgramIndex(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const auto program_index = rp.PopRaw<u8>();
+
+    LOG_DEBUG(Service_FS, "called, program_index={}", program_index);
+
+    auto patched_romfs = romfs_controller->OpenPatchedRomFSWithProgramIndex(
+        program_id, program_index, FileSys::ContentRecordType::Program);
+
+    if (!patched_romfs) {
+        // TODO: Find the right error code to use here
+        LOG_ERROR(Service_FS, "could not open storage with program_index={}", program_index);
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultUnknown);
+        return;
+    }
+
+    auto storage = std::make_shared<IStorage>(system, std::move(patched_romfs));
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<IStorage>(std::move(storage));
+}
+
+void FSP_SRV::DisableAutoSaveDataCreation(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    save_data_controller->SetAutoCreate(false);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void FSP_SRV::SetGlobalAccessLogMode(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    access_log_mode = rp.PopEnum<AccessLogMode>();
+
+    LOG_DEBUG(Service_FS, "called, access_log_mode={}", access_log_mode);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void FSP_SRV::GetGlobalAccessLogMode(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    IPC::ResponseBuilder rb{ctx, 3};
+    rb.Push(ResultSuccess);
+    rb.PushEnum(access_log_mode);
+}
+
+void FSP_SRV::OutputAccessLogToSdCard(HLERequestContext& ctx) {
+    const auto raw = ctx.ReadBufferCopy();
+    auto log = Common::StringFromFixedZeroTerminatedBuffer(
+        reinterpret_cast<const char*>(raw.data()), raw.size());
+
+    LOG_DEBUG(Service_FS, "called");
+
+    reporter.SaveFSAccessLog(log);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(ResultSuccess);
+}
+
+void FSP_SRV::GetProgramIndexForAccessLog(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    IPC::ResponseBuilder rb{ctx, 4};
+    rb.Push(ResultSuccess);
+    rb.PushEnum(AccessLogVersion::Latest);
+    rb.Push(access_log_program_index);
+}
+
+void FSP_SRV::GetCacheStorageSize(HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto index{rp.Pop<s32>()};
+
+    LOG_WARNING(Service_FS, "(STUBBED) called with index={}", index);
+
+    IPC::ResponseBuilder rb{ctx, 6};
+    rb.Push(ResultSuccess);
+    rb.Push(s64{0});
+    rb.Push(s64{0});
+}
+
+class IMultiCommitManager final : public ServiceFramework<IMultiCommitManager> {
+public:
+    explicit IMultiCommitManager(Core::System& system_)
+        : ServiceFramework{system_, "IMultiCommitManager"} {
+        static const FunctionInfo functions[] = {
+            {1, &IMultiCommitManager::Add, "Add"},
+            {2, &IMultiCommitManager::Commit, "Commit"},
+        };
+        RegisterHandlers(functions);
+    }
+
+private:
+    FileSys::VirtualFile backend;
+
+    void Add(HLERequestContext& ctx) {
+        LOG_WARNING(Service_FS, "(STUBBED) called");
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultSuccess);
+    }
+
+    void Commit(HLERequestContext& ctx) {
+        LOG_WARNING(Service_FS, "(STUBBED) called");
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(ResultSuccess);
+    }
+};
+
+void FSP_SRV::OpenMultiCommitManager(HLERequestContext& ctx) {
+    LOG_DEBUG(Service_FS, "called");
+
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(ResultSuccess);
+    rb.PushIpcInterface<IMultiCommitManager>(std::make_shared<IMultiCommitManager>(system));
+}
+
+} // namespace Service::FileSystem
diff --git a/src/core/hle/service/filesystem/fsp/fsp_srv.h b/src/core/hle/service/filesystem/fsp/fsp_srv.h
new file mode 100644
index 000000000..26980af99
--- /dev/null
+++ b/src/core/hle/service/filesystem/fsp/fsp_srv.h
@@ -0,0 +1,78 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include "core/hle/service/service.h"
+
+namespace Core {
+class Reporter;
+}
+
+namespace FileSys {
+class ContentProvider;
+class FileSystemBackend;
+} // namespace FileSys
+
+namespace Service::FileSystem {
+
+class RomFsController;
+class SaveDataController;
+
+enum class AccessLogVersion : u32 {
+    V7_0_0 = 2,
+
+    Latest = V7_0_0,
+};
+
+enum class AccessLogMode : u32 {
+    None,
+    Log,
+    SdCard,
+};
+
+class FSP_SRV final : public ServiceFramework<FSP_SRV> {
+public:
+    explicit FSP_SRV(Core::System& system_);
+    ~FSP_SRV() override;
+
+private:
+    void SetCurrentProcess(HLERequestContext& ctx);
+    void OpenFileSystemWithPatch(HLERequestContext& ctx);
+    void OpenSdCardFileSystem(HLERequestContext& ctx);
+    void CreateSaveDataFileSystem(HLERequestContext& ctx);
+    void CreateSaveDataFileSystemBySystemSaveDataId(HLERequestContext& ctx);
+    void OpenSaveDataFileSystem(HLERequestContext& ctx);
+    void OpenSaveDataFileSystemBySystemSaveDataId(HLERequestContext& ctx);
+    void OpenReadOnlySaveDataFileSystem(HLERequestContext& ctx);
+    void OpenSaveDataInfoReaderBySaveDataSpaceId(HLERequestContext& ctx);
+    void OpenSaveDataInfoReaderOnlyCacheStorage(HLERequestContext& ctx);
+    void WriteSaveDataFileSystemExtraDataBySaveDataAttribute(HLERequestContext& ctx);
+    void ReadSaveDataFileSystemExtraDataWithMaskBySaveDataAttribute(HLERequestContext& ctx);
+    void OpenDataStorageByCurrentProcess(HLERequestContext& ctx);
+    void OpenDataStorageByDataId(HLERequestContext& ctx);
+    void OpenPatchDataStorageByCurrentProcess(HLERequestContext& ctx);
+    void OpenDataStorageWithProgramIndex(HLERequestContext& ctx);
+    void DisableAutoSaveDataCreation(HLERequestContext& ctx);
+    void SetGlobalAccessLogMode(HLERequestContext& ctx);
+    void GetGlobalAccessLogMode(HLERequestContext& ctx);
+    void OutputAccessLogToSdCard(HLERequestContext& ctx);
+    void GetProgramIndexForAccessLog(HLERequestContext& ctx);
+    void OpenMultiCommitManager(HLERequestContext& ctx);
+    void GetCacheStorageSize(HLERequestContext& ctx);
+
+    FileSystemController& fsc;
+    const FileSys::ContentProvider& content_provider;
+    const Core::Reporter& reporter;
+
+    FileSys::VirtualFile romfs;
+    u64 current_process_id = 0;
+    u32 access_log_program_index = 0;
+    AccessLogMode access_log_mode = AccessLogMode::None;
+    u64 program_id = 0;
+    std::shared_ptr<SaveDataController> save_data_controller;
+    std::shared_ptr<RomFsController> romfs_controller;
+};
+
+} // namespace Service::FileSystem
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