build: sys: pacify hardware center validation

Infverif /k no longer likes "undecorated" [DefaultInstall] sections and
instead it wants them "architecture decorated". For example,
[DefaultInstall.ntarm64]. So play along to have our driver signed.

For more information see:
https://learn.microsoft.com/en-us/windows-hardware/drivers/develop/creating-a-primitive-driver

Changelog.md

@@ -1,6 +1,52 @@
 # Changelog
 
 
+## v2.0B2 (2023 Beta2)
+
+This release is a major version change for WinFsp (from 1.x to 2.x). There are no backwards incompatible API changes in this release, but nevertheless enough things change that warrant a version change.
+
+The major new feature of this release is that it allows uninstallation and reinstallation of WinFsp **without reboot**. Going forward installers named `winfsp-2.x.y.msi` can be uninstalled and reinstalled without reboot. Furthermore a later version `winfsp-2.x.y.msi` installer can be used to upgrade over an earlier version `winfsp-2.x.y.msi` installer. However note that a `winfsp-2.x.y.msi` installer cannot be used to upgrade over a "legacy" `winfsp-1.x.y.msi` installer; you will still need to uninstall the "old" `winfsp-1.x.y.msi` installer, potentially reboot and then install the "new" `winfsp-2.x.y.msi` installer.
+
+Changes visible to file system developers are listed below:
+
+- WinFsp executable files are now installed by default in the directory `C:\Program Files (x86)\WinFsp\SxS\sxs.<InstanceID>\bin`. The previous directory `C:\Program Files (x86)\WinFsp\bin` is now a junction that points to the above directory.
+
+- The WinFsp driver name is no longer `winfsp`, but rather a name such as `winfsp+<InstanceID>`. This means that managing the driver using the `sc.exe` utility is no longer as easy.
+
+- The `fsptool` utility has been updated with new commands `lsdrv`, `load`, `unload` and `ver`. The `lsdrv`, `load` and `unload` commands can be used to manage the driver from the command line. This is rarely necessary, but may be useful for troubleshooting purposes.
+
+- Prior to this release the WinFsp driver would never unmount a file system volume unless the user mode file system requested the unmount. From this release onward it is possible for the WinFsp driver to unmount a file system volume, without a user mode file system request. This is to allow for the driver to be unloaded.
+
+    A new operation `DispatcherStopped` has been added to `FSP_FILE_SYSTEM_INTERFACE`, which is sent after the file system volume has been unmounted and the file system dispatcher has been stopped. This can happen because of a user mode file system request via `FspFileSystemStopDispatcher` or because of driver unload. The `DispatcherStopped` operation includes a `Normally` parameter, which is `TRUE` for normal file system shutdown via `FspFileSystemStopDispatcher` and `FALSE` otherwise.
+
+    Native file systems that use the `FspService` infrastructure can use the `FspFileSystemStopServiceIfNecessary` API to handle the `DispatcherStopped` operation (see the MEMFS and NTPTFS samples). FUSE file systems get this functionality for free. .NET file systems that use the `Service` class infrastructure also get this functionality for free.
+
+- WinFsp now offers a .NET library that targets .NET Framework 3.5 (as before) and one that targets .NET Standard 2.0. This is due to work by @Noire001 in PR #451.
+
+- FUSE now supports path components up to 255 characters long (previously it was 255 bytes). This is due to work by @zeho11 in PR #474.
+
+    - The FUSE passthrough file systems have been updated to support long paths. This is also due to work by @zeho11.
+
+- The WinFsp symbols directory has been removed. If you are looking for WinFsp symbols you can find them at https://github.com/winfsp/winfsp.sym
+
+
+## v2.0B1 (2023 Beta1)
+
+This release is a major version change for WinFsp (from 1.x to 2.x). There are no backwards incompatible API changes in this release, but nevertheless enough things change that warrant a version change.
+
+The major new feature of this release is that it allows uninstallation and reinstallation of WinFsp **without reboot**. Going forward installers named `winfsp-2.x.y.msi` can be uninstalled and reinstalled without reboot. Furthermore a later version `winfsp-2.x.y.msi` installer can be used to upgrade over an earlier version `winfsp-2.x.y.msi` installer. However note that a `winfsp-2.x.y.msi` installer cannot be used to upgrade over a "legacy" `winfsp-1.x.y.msi` installer; you will still need to uninstall the "old" `winfsp-1.x.y.msi` installer, potentially reboot and then install the "new" `winfsp-2.x.y.msi` installer.
+
+Some changes that may be visible to file system developers are listed below:
+
+- WinFsp executable files are now installed by default in the directory `C:\Program Files (x86)\WinFsp\SxS\sxs.<InstanceID>\bin`. The previous directory `C:\Program Files (x86)\WinFsp\bin` is now a junction that points to the above directory.
+
+- The WinFsp driver name is no longer `winfsp`, but rather a name such as `winfsp+<InstanceID>`. This means that managing the driver using the `sc.exe` utility is no longer as easy.
+
+- The `fsptool` utility has been updated with new commands `lsdrv`, `load`, `unload` and `ver`. The `lsdrv`, `load` and `unload` commands can be used to manage the driver from the command line. This is rarely necessary, but may be useful for troubleshooting purposes.
+
+- The WinFsp symbols directory has been removed. If you are looking for WinFsp symbols you can find them at https://github.com/winfsp/winfsp.sym
+
+
 ## v1.12.22339 (2022.2 Update1)
 
 *Note: This release (`v1.12.22339`) is the same as the previous release (`v1.12`) except that: (1) the kernel-mode drivers are now digitally signed only with the Microsoft Attestation signature, and that: (2) no release assets are digitally signed with SHA-1. (This change was necessary to fix a problem in older versions of Windows such as Windows 7.)*

Contributors.asciidoc

@@ -66,6 +66,7 @@ CONTRIBUTOR LIST
 |Gal Hammer (Red Hat, https://www.redhat.com)                   |ghammer at redhat.com
 |John Oberschelp                                                |john at oberschelp.net
 |John Tyner                                                     |jtyner at gmail.com
+|Konstantinos Karakostas                                        |noiredev at protonmail.com
 |Paweł Wegner (Google LLC, https://google.com)                  |lemourin at google.com
 |Pedro Frejo (Arpa System, https://arpasystem.com)              |pedro.frejo at arpasystem.com
 |Ronny Chan                                                     |ronny at ronnychan.ca
@@ -73,4 +74,5 @@ CONTRIBUTOR LIST
 |Santiago Ganis                                                 |sganis at gmail.com
 |Tobias Urlaub                                                  |saibotu at outlook.de
 |Victor Gao                                                     |victgm at outlook.com
+|Zeho Huang                                                     |zeho11 at protonmail.com
 |===

appveyor.yml

@@ -51,6 +51,11 @@ install:
       $targets.Save("C:\Program Files (x86)\Windows Kits\10\build\WindowsDriver.Common.targets")
       Add-AppveyorMessage "Hack to make WDK 1903 work on VS2015"
     }
+# Install .NET SDK on VS2015 image
+- ps: |
+    if ($env:APPVEYOR_BUILD_WORKER_IMAGE -eq "Visual Studio 2015") {
+        & ([scriptblock]::Create((New-Object System.Net.WebClient).DownloadString('https://dot.net/v1/dotnet-install.ps1'))) -InstallDir "C:\dotnet"
+    }
 # Submodules
 - git submodule update --init --recursive
 # Kernel and user mode dumps
@@ -76,6 +81,9 @@ build_script:
 # remove ARM64 project configurations to build in VS2015/VS2017
 - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" tools\gensrc\remove-build-arm64.bat
 - if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" tools\gensrc\remove-build-arm64.bat
+# remove .NET library from solution for VS2015 and use the .NET SDK instead
+- if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" tools\gensrc\remove-build-dotnet.bat build\VStudio
+- if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" set PATH=C:\dotnet;%PATH%
 # build winfsp
 - tools\build.bat %CONFIGURATION%
 

build/VStudio/build.version.props

@@ -18,10 +18,10 @@
         <MyCompanyName>Navimatics LLC</MyCompanyName>
         <MyCopyright>2015-$([System.DateTime]::Now.ToString(`yyyy`)) Bill Zissimopoulos</MyCopyright>
 
-        <MyCanonicalVersion>1.12</MyCanonicalVersion>
+        <MyCanonicalVersion>2.0</MyCanonicalVersion>
 
-        <MyProductVersion>2022.2</MyProductVersion>
-        <MyProductStage>Gold</MyProductStage>
+        <MyProductVersion>2023 Beta2</MyProductVersion>
+        <MyProductStage>Beta</MyProductStage>
 
         <MyCrossCert>DigiCertGlobalG3CodeSigningECCSHA3842021CA1.cer</MyCrossCert>
         <MyCertIssuer>DigiCert</MyCertIssuer>

build/VStudio/dotnet/winfsp.net.csproj

@@ -1,25 +1,29 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
+  <PropertyGroup>
+    <BaseIntermediateOutputPath>$(SolutionDir)build\$(MSBuildProjectName).build\</BaseIntermediateOutputPath>
+  </PropertyGroup>
+  <Import Project="Sdk.props" Sdk="Microsoft.NET.Sdk" />
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), build.common.props))/build.common.props" />
-  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{94580219-CC8D-4FE5-A3BE-437B0B3481E1}</ProjectGuid>
     <OutputType>Library</OutputType>
     <ProjectName>winfsp.net</ProjectName>
     <RootNamespace>Fsp</RootNamespace>
     <AssemblyName>$(MyProductFileName)-msil</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworks>netstandard2.0;net35</TargetFrameworks>
     <FileAlignment>512</FileAlignment>
-    <TargetFrameworkProfile />
+    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(TargetFramework)' != 'netstandard2.0'">
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>$(SolutionDir)build\$(Configuration)\</OutputPath>
-    <BaseIntermediateOutputPath>$(SolutionDir)build\$(ProjectName).build\</BaseIntermediateOutputPath>
     <IntermediateOutputPath>$(BaseIntermediateOutputPath)$(Configuration)\</IntermediateOutputPath>
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
@@ -32,7 +36,6 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>$(SolutionDir)build\$(Configuration)\</OutputPath>
-    <BaseIntermediateOutputPath>$(SolutionDir)build\$(ProjectName).build\</BaseIntermediateOutputPath>
     <IntermediateOutputPath>$(BaseIntermediateOutputPath)$(Configuration)\</IntermediateOutputPath>
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
@@ -47,9 +50,6 @@
   <PropertyGroup>
     <AssemblyOriginatorKeyFile>winfsp.net.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="System" />
-  </ItemGroup>
   <ItemGroup>
     <Compile Include="..\..\..\src\dotnet\FileSystemBase+Const.cs">
       <Link>FileSystemBase+Const.cs</Link>
@@ -70,29 +70,28 @@
   <ItemGroup>
     <None Include="winfsp.net.snk" />
   </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
-  <Target Name="AfterBuild">
-  </Target>
-  -->
-  <Target Name="BeforeBuild">
-    <ItemGroup>
-      <AssemblyInfo Include="using System.Reflection%3b" />
-      <AssemblyInfo Include="[assembly: AssemblyProduct(&quot;$(MyProductName)&quot;)]" />
-      <AssemblyInfo Include="[assembly: AssemblyTitle(&quot;$(MyDescription)&quot;)]" />
-      <AssemblyInfo Include="[assembly: AssemblyCompany(&quot;$(MyCompanyName)&quot;)]" />
-      <AssemblyInfo Include="[assembly: AssemblyCopyright(&quot;$(MyCopyright)&quot;)]" />
-      <AssemblyInfo Include="[assembly: AssemblyVersion(&quot;$(MyAssemblyVersion)&quot;)]" />
-      <AssemblyInfo Include="[assembly: AssemblyFileVersion(&quot;$(MyVersion)&quot;)]" />
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
+    <PackageReference Include="Microsoft.Win32.Registry">
+      <Version>5.0.0</Version>
+    </PackageReference>
+    <PackageReference Include="System.IO.FileSystem.AccessControl">
+      <Version>5.0.0</Version>
+    </PackageReference>
   </ItemGroup>
-    <MakeDir Directories="$(IntermediateOutputPath)" />
-    <WriteLinesToFile File="$(IntermediateOutputPath)AssemblyInfo.cs" Lines="@(AssemblyInfo)" Overwrite="true" />
-    <ItemGroup>
-      <Compile Include="$(IntermediateOutputPath)AssemblyInfo.cs" />
-      <FileWrites Include="$(IntermediateOutputPath)AssemblyInfo.cs" />
-    </ItemGroup>
-  </Target>
+  <PropertyGroup>
+    <AssemblyName>$(MyProductFileName)-msil</AssemblyName>
+    <AssemblyTitle>$(MyDescription)</AssemblyTitle>
+    <Product>$(MyProductName)</Product>
+    <Copyright>$(MyCopyright)</Copyright>
+    <AssemblyVersion>$(MyAssemblyVersion)</AssemblyVersion>
+    <FileVersion>$(MyVersion)</FileVersion>
+    <!-- NuGet metadata -->
+    <PackageId>$(MyProductFileName).net</PackageId>
+    <Version>$(MyVersion)</Version>
+    <Description>$(MyDescription)</Description>
+    <Authors>$(MyCopyright)</Authors>
+    <Company>$(MyCompanyName)</Company>
+  </PropertyGroup>
   <PropertyGroup>
     <PostBuildEvent>exit /b 0
 
@@ -110,4 +109,5 @@ for /f "delims=" %25%25l in ($(ProjectDir)winfsp.net.policy.config) do (
 "$(MSBuildProgramFiles32)\Microsoft SDKs\Windows\v7.0A\Bin\al.exe" /product:"$(MyProductName)" /title:"$(MyDescription)" /company:"$(MyCompanyName)" /copyright:"$(MyCopyright)" /version:"$(MyAssemblyPolicyVersion)" /fileversion:"$(MyVersion)" /link:$(OutDir)policy.$(MyAssemblyPolicyVersion).$(TargetName).config /out:$(OutDir)policy.$(MyAssemblyPolicyVersion).$(TargetName).dll /keyfile:$(ProjectDir)$(ProjectName).snk
 </PostBuildEvent>
   </PropertyGroup>
+  <Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk" />
 </Project>

build/VStudio/installer/CustomActions/CustomActions.cpp

@@ -21,10 +21,55 @@
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
+#include <shellapi.h>
 #include <msiquery.h>
 #include <wcautil.h>
 #include <strutil.h>
 
+static HINSTANCE DllInstance;
+
+UINT __stdcall InstanceID(MSIHANDLE MsiHandle)
+{
+#if 0
+    WCHAR MessageBuf[64];
+    wsprintfW(MessageBuf, L"PID=%ld", GetCurrentProcessId());
+    MessageBoxW(0, MessageBuf, L"" __FUNCTION__ " Break", MB_OK);
+#endif
+
+    HRESULT hr = S_OK;
+    UINT err = ERROR_SUCCESS;
+    SYSTEMTIME SystemTime;
+    WCHAR Result[32+1];
+
+    hr = WcaInitialize(MsiHandle, __FUNCTION__);
+    ExitOnFailure(hr, "Failed to initialize");
+
+    WcaLog(LOGMSG_STANDARD, "Initialized");
+
+    GetSystemTime(&SystemTime);
+    wsprintfW(Result, L"%04u%02u%02uT%02u%02u%02uZ",
+        SystemTime.wYear,
+        SystemTime.wMonth,
+        SystemTime.wDay,
+        SystemTime.wHour,
+        SystemTime.wMinute,
+        SystemTime.wSecond);
+
+    /*
+     * Sleep 1 second to ensure timestamp uniqueness.
+     *
+     * Note that this assumes that time is monotonic and users do not change time.
+     * Disable for now as it is assumed that the installation takes more than 1 second to complete.
+     */
+    //Sleep(1000);
+
+    WcaSetProperty(L"" __FUNCTION__, Result);
+
+LExit:
+    err = SUCCEEDED(hr) ? ERROR_SUCCESS : ERROR_INSTALL_FAILURE;
+    return WcaFinalize(err);
+}
+
 UINT __stdcall ServiceRunning(MSIHANDLE MsiHandle)
 {
 #if 0
@@ -44,7 +89,7 @@ UINT __stdcall ServiceRunning(MSIHANDLE MsiHandle)
     hr = WcaInitialize(MsiHandle, __FUNCTION__);
     ExitOnFailure(hr, "Failed to initialize");
 
-    WcaGetProperty(L"" __FUNCTION__, &ServiceName);
+    hr = WcaGetProperty(L"" __FUNCTION__, &ServiceName);
     ExitOnFailure(hr, "Failed to get ServiceName");
 
     WcaLog(LOGMSG_STANDARD, "Initialized: \"%S\"", ServiceName);
@@ -70,12 +115,390 @@ LExit:
     return WcaFinalize(err);
 }
 
+UINT __stdcall DeferredAction(MSIHANDLE MsiHandle)
+{
+#if 0
+    WCHAR MessageBuf[64];
+    wsprintfW(MessageBuf, L"PID=%ld", GetCurrentProcessId());
+    MessageBoxW(0, MessageBuf, L"" __FUNCTION__ " Break", MB_OK);
+#endif
+
+    HRESULT hr = S_OK;
+    UINT err = ERROR_SUCCESS;
+    PWSTR CommandLine = 0;
+    PWSTR *Argv;
+    int Argc;
+    CHAR ProcName[64];
+    FARPROC Proc;
+
+    hr = WcaInitialize(MsiHandle, __FUNCTION__);
+    ExitOnFailure(hr, "Failed to initialize");
+
+    hr = WcaGetProperty(L"CustomActionData", &CommandLine);
+    ExitOnFailure(hr, "Failed to get CommandLine");
+
+    WcaLog(LOGMSG_STANDARD, "Initialized: \"%S\"", CommandLine);
+
+    Argv = CommandLineToArgvW(CommandLine, &Argc);
+    ExitOnNullWithLastError(Argv, hr, "Failed to CommandLineToArgvW");
+
+    if (0 < Argc)
+    {
+        if (0 == WideCharToMultiByte(CP_UTF8, 0, Argv[0], -1, ProcName, sizeof ProcName, 0, 0))
+            ExitWithLastError(hr, "Failed to WideCharToMultiByte");
+
+        Proc = GetProcAddress(DllInstance, ProcName);
+        ExitOnNullWithLastError(Proc, hr, "Failed to GetProcAddress");
+
+        err = ((HRESULT (*)(int, PWSTR *))Proc)(Argc, Argv);
+        ExitOnWin32Error(err, hr, "Failed to %s", ProcName);
+    }
+    else
+    {
+        hr = E_INVALIDARG;
+        ExitOnFailure(hr, "Failed to get arguments");
+    }
+
+LExit:
+    LocalFree(Argv);
+    ReleaseStr(CommandLine);
+
+    err = SUCCEEDED(hr) ? ERROR_SUCCESS : ERROR_INSTALL_FAILURE;
+    return WcaFinalize(err);
+}
+
+static DWORD MakeSymlink(PWSTR Symlink, PWSTR Target);
+static DWORD MakeJunction(PWSTR Junction, PWSTR Target);
+static DWORD CreateJunction(PWSTR Junction, PWSTR Target);
+static DWORD RemoveFile(PWSTR FileName);
+
+DWORD InstallSymlinks(int Argc, PWSTR *Argv)
+{
+    /* usage: InstallSymlinks/InstallJunctions SourceDir TargetDir Name... */
+
+    DWORD Result;
+    BOOL Junctions;
+    PWSTR SourceDir, TargetDir;
+    WCHAR SourcePath[MAX_PATH], TargetPath[MAX_PATH];
+    int SourceDirLen, TargetDirLen, Len;
+
+    if (4 > Argc)
+    {
+        Result = ERROR_INVALID_PARAMETER;
+        goto exit;
+    }
+
+    Junctions = 0 == lstrcmpW(L"InstallJunctions", Argv[0]);
+    SourceDir = Argv[1];
+    TargetDir = Argv[2];
+    SourceDirLen = lstrlenW(SourceDir);
+    TargetDirLen = lstrlenW(TargetDir);
+
+    for (int Argi = 3; Argc > Argi; Argi++)
+    {
+        Len = lstrlenW(Argv[Argi]);
+        if (MAX_PATH < SourceDirLen + Len + 1 || MAX_PATH < TargetDirLen + Len + 1)
+        {
+            Result = ERROR_FILENAME_EXCED_RANGE;
+            goto exit;
+        }
+
+        memcpy(SourcePath, SourceDir, SourceDirLen * sizeof(WCHAR));
+        memcpy(SourcePath + SourceDirLen, Argv[Argi], Len * sizeof(WCHAR));
+        SourcePath[SourceDirLen + Len] = L'\0';
+
+        memcpy(TargetPath, TargetDir, TargetDirLen * sizeof(WCHAR));
+        memcpy(TargetPath + TargetDirLen, Argv[Argi], Len * sizeof(WCHAR));
+        TargetPath[TargetDirLen + Len] = L'\0';
+
+        if (!Junctions)
+            Result = MakeSymlink(SourcePath, TargetPath);
+        else
+            Result = MakeJunction(SourcePath, TargetPath);
+#if 0
+    WCHAR MessageBuf[1024];
+    wsprintfW(MessageBuf, L"MakeSymlink(\"%s\", \"%s\") = %lu", SourcePath, TargetPath, Result);
+    MessageBoxW(0, MessageBuf, L"TRACE", MB_OK);
+#endif
+        if (ERROR_SUCCESS != Result)
+            goto exit;
+    }
+
+    Result = ERROR_SUCCESS;
+
+exit:
+    return Result;
+}
+
+DWORD InstallJunctions(int Argc, PWSTR *Argv)
+{
+    return InstallSymlinks(Argc, Argv);
+}
+
+DWORD RemoveFiles(int Argc, PWSTR *Argv)
+{
+    /* usage: RemoveFiles Dir Name... */
+
+    DWORD Result;
+    PWSTR Dir;
+    WCHAR Path[MAX_PATH];
+    int DirLen, Len;
+
+    if (3 > Argc)
+    {
+        Result = ERROR_INVALID_PARAMETER;
+        goto exit;
+    }
+
+    Dir = Argv[1];
+    DirLen = lstrlenW(Dir);
+
+    for (int Argi = 2; Argc > Argi; Argi++)
+    {
+        Len = lstrlenW(Argv[Argi]);
+        if (MAX_PATH < DirLen + Len + 1)
+        {
+            Result = ERROR_FILENAME_EXCED_RANGE;
+            goto exit;
+        }
+
+        memcpy(Path, Dir, DirLen * sizeof(WCHAR));
+        memcpy(Path + DirLen, Argv[Argi], Len * sizeof(WCHAR));
+        Path[DirLen + Len] = L'\0';
+
+        Result = RemoveFile(Path);
+#if 0
+    WCHAR MessageBuf[1024];
+    wsprintfW(MessageBuf, L"RemoveFile(\"%s\") = %lu", Path, Result);
+    MessageBoxW(0, MessageBuf, L"TRACE", MB_OK);
+#endif
+        if (ERROR_SUCCESS != Result)
+            goto exit;
+    }
+
+    Result = ERROR_SUCCESS;
+
+exit:
+    return Result;
+}
+
+static DWORD MakeSymlink(PWSTR Symlink, PWSTR Target)
+{
+    DWORD Result;
+    DWORD FileAttributes, Flags;
+
+    RemoveFile(Symlink);
+
+    FileAttributes = GetFileAttributesW(Target);
+    if (INVALID_FILE_ATTRIBUTES == FileAttributes)
+    {
+        Result = GetLastError();
+        goto exit;
+    }
+    Flags = 0 != (FileAttributes & FILE_ATTRIBUTE_DIRECTORY) ? SYMBOLIC_LINK_FLAG_DIRECTORY : 0;
+
+    if (!CreateSymbolicLinkW(Symlink, Target, Flags))
+    {
+        Result = GetLastError();
+        RemoveFile(Symlink);
+        goto exit;
+    }
+
+    Result = ERROR_SUCCESS;
+
+exit:
+    return Result;
+}
+
+static DWORD MakeJunction(PWSTR Junction, PWSTR Target)
+{
+    DWORD Result;
+    DWORD FileAttributes;
+
+    RemoveFile(Junction);
+
+    FileAttributes = GetFileAttributesW(Target);
+    if (INVALID_FILE_ATTRIBUTES == FileAttributes)
+    {
+        Result = GetLastError();
+        goto exit;
+    }
+    if (0 == (FileAttributes & FILE_ATTRIBUTE_DIRECTORY))
+    {
+        Result = ERROR_DIRECTORY;
+        goto exit;
+    }
+
+    Result = CreateJunction(Junction, Target);
+    if (ERROR_SUCCESS != Result)
+    {
+        RemoveFile(Junction);
+        goto exit;
+    }
+
+    Result = ERROR_SUCCESS;
+
+exit:
+    return Result;
+}
+
+static DWORD CreateJunction(PWSTR Junction, PWSTR Target)
+{
+    /*
+     * The REPARSE_DATA_BUFFER definitions appear to be missing from the user mode headers.
+     */
+    typedef struct _REPARSE_DATA_BUFFER
+    {
+        ULONG ReparseTag;
+        USHORT ReparseDataLength;
+        USHORT Reserved;
+        union
+        {
+            struct
+            {
+                USHORT SubstituteNameOffset;
+                USHORT SubstituteNameLength;
+                USHORT PrintNameOffset;
+                USHORT PrintNameLength;
+                ULONG Flags;
+                WCHAR PathBuffer[1];
+            } SymbolicLinkReparseBuffer;
+            struct
+            {
+                USHORT SubstituteNameOffset;
+                USHORT SubstituteNameLength;
+                USHORT PrintNameOffset;
+                USHORT PrintNameLength;
+                WCHAR PathBuffer[1];
+            } MountPointReparseBuffer;
+            struct
+            {
+                UCHAR DataBuffer[1];
+            } GenericReparseBuffer;
+        } DUMMYUNIONNAME;
+    } REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
+    const LONG REPARSE_DATA_BUFFER_HEADER_SIZE =
+        FIELD_OFFSET(REPARSE_DATA_BUFFER, GenericReparseBuffer);
+    const DWORD FSCTL_SET_REPARSE_POINT = 0x000900a4;
+
+    DWORD Result;
+    HANDLE Handle = INVALID_HANDLE_VALUE;
+    USHORT TargetLength, ReparseDataLength;
+    PREPARSE_DATA_BUFFER ReparseData = 0;
+    PWSTR PathBuffer;
+    DWORD Bytes;
+
+    if (!(
+        ((L'A' <= Target[0] && Target[0] <= L'Z') || (L'a' <= Target[0] && Target[0] <= L'z')) &&
+        L':' == Target[1]
+        ))
+    {
+        Result = ERROR_INVALID_NAME;
+        goto exit;
+    }
+
+    Handle = CreateFileW(Junction,
+        FILE_WRITE_ATTRIBUTES,
+        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+        0,
+        CREATE_NEW,
+        FILE_ATTRIBUTE_DIRECTORY |
+            FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_POSIX_SEMANTICS,
+        0);
+    if (INVALID_HANDLE_VALUE == Handle)
+    {
+        Result = GetLastError();
+        goto exit;
+    }
+
+    TargetLength = (USHORT)lstrlenW(Target) * sizeof(WCHAR);
+    ReparseDataLength = (USHORT)(
+        FIELD_OFFSET(REPARSE_DATA_BUFFER, MountPointReparseBuffer.PathBuffer) -
+        FIELD_OFFSET(REPARSE_DATA_BUFFER, MountPointReparseBuffer)) +
+        4 * sizeof(WCHAR) + 2 * (TargetLength + sizeof(WCHAR));
+    ReparseData = (PREPARSE_DATA_BUFFER)
+        HeapAlloc(GetProcessHeap(), 0, REPARSE_DATA_BUFFER_HEADER_SIZE + ReparseDataLength);
+    if (0 == ReparseData)
+    {
+        Result = ERROR_NO_SYSTEM_RESOURCES;
+        goto exit;
+    }
+
+    ReparseData->ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
+    ReparseData->ReparseDataLength = ReparseDataLength;
+    ReparseData->Reserved = 0;
+    ReparseData->MountPointReparseBuffer.SubstituteNameOffset = 0;
+    ReparseData->MountPointReparseBuffer.SubstituteNameLength =
+        4 * sizeof(WCHAR) + TargetLength;
+    ReparseData->MountPointReparseBuffer.PrintNameOffset =
+        ReparseData->MountPointReparseBuffer.SubstituteNameLength + sizeof(WCHAR);
+    ReparseData->MountPointReparseBuffer.PrintNameLength =
+        TargetLength;
+
+    PathBuffer = ReparseData->MountPointReparseBuffer.PathBuffer;
+    PathBuffer[0] = L'\\';
+    PathBuffer[1] = L'?';
+    PathBuffer[2] = L'?';
+    PathBuffer[3] = L'\\';
+    memcpy(PathBuffer + 4, Target, TargetLength);
+    PathBuffer[4 + TargetLength / sizeof(WCHAR)] = L'\0';
+
+    PathBuffer = ReparseData->MountPointReparseBuffer.PathBuffer +
+        (ReparseData->MountPointReparseBuffer.PrintNameOffset) / sizeof(WCHAR);
+    memcpy(PathBuffer, Target, TargetLength);
+    PathBuffer[TargetLength / sizeof(WCHAR)] = L'\0';
+
+    if (!DeviceIoControl(Handle, FSCTL_SET_REPARSE_POINT,
+        ReparseData, REPARSE_DATA_BUFFER_HEADER_SIZE + ReparseData->ReparseDataLength,
+        0, 0,
+        &Bytes, 0))
+    {
+        Result = GetLastError();
+        goto exit;
+    }
+
+    Result = ERROR_SUCCESS;
+
+exit:
+    if (INVALID_HANDLE_VALUE != Handle)
+        CloseHandle(Handle);
+
+    if (0 != ReparseData)
+        HeapFree(GetProcessHeap(), 0, ReparseData);
+
+    return Result;
+}
+
+static DWORD RemoveFile(PWSTR FileName)
+{
+    DWORD Result;
+
+    if (!RemoveDirectoryW(FileName))
+    {
+        Result = GetLastError();
+        if (ERROR_DIRECTORY != Result)
+            goto exit;
+
+        if (!DeleteFileW(FileName))
+        {
+            Result = GetLastError();
+            goto exit;
+        }
+    }
+
+    Result = ERROR_SUCCESS;
+
+exit:
+    return Result;
+}
+
 extern "C"
 BOOL WINAPI DllMain(HINSTANCE Instance, DWORD Reason, PVOID Reserved)
 {
     switch(Reason)
     {
     case DLL_PROCESS_ATTACH:
+        DllInstance = Instance;
         WcaGlobalInitialize(Instance);
         break;
     case DLL_PROCESS_DETACH:

build/VStudio/installer/CustomActions/CustomActions.def

@@ -1,2 +1,7 @@
 EXPORTS
+    InstanceID
     ServiceRunning
+    DeferredAction
+    InstallSymlinks
+    InstallJunctions
+    RemoveFiles

build/VStudio/installer/Product.wxs

@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
+
+<!-- The UpgradeCode of the old WinFsp installer that did not support upgrades. -->
+<?define OldVersionUpgradeCode="82F812D9-4083-4EF1-8BC8-0F1EDA05B46B"?>
+
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
     xmlns:dep="http://schemas.microsoft.com/wix/DependencyExtension">
     <Product
@@ -7,7 +11,7 @@
         Manufacturer="$(var.MyCompanyName)"
         Version="$(var.MyVersion)"
         Language="1033"
-        UpgradeCode="82F812D9-4083-4EF1-8BC8-0F1EDA05B46B">
+        UpgradeCode="5466A3D8-3AA1-4240-B6A0-3A051940A3EC">
 
         <Package
             Description="$(var.MyProductName) - $(var.MyDescription)"
@@ -15,13 +19,26 @@
             Compressed="yes"
             InstallScope="perMachine" />
         <MajorUpgrade
-            Disallow="yes"
+            Disallow="no"
             AllowDowngrades="no"
-            AllowSameVersionUpgrades="no"
-            DisallowUpgradeErrorMessage="An older version of $(var.MyProductName) is already installed. You must uninstall it before you can install this version."
+            AllowSameVersionUpgrades="yes"
             DowngradeErrorMessage="A newer version of $(var.MyProductName) is already installed." />
         <Media Id="1" Cabinet="$(var.MyProductName).cab" EmbedCab="yes" />
         
+        <!-- Determine if we are on Win7 or above. -->
+        <Condition Message="$(var.MyProductName) requires Windows version 7 or higher in order to be installed.">
+            <![CDATA[Installed OR (VersionNT >= 601)]]>
+        </Condition>
+
+        <!-- Determine if the old WinFsp installer that did not support upgrades is installed. -->
+        <Property Id="OLDVERSIONINSTALLED">
+            <ProductSearch UpgradeCode="$(var.OldVersionUpgradeCode)" Minimum="0.0.0.0" />
+        </Property>
+        <Condition Message="An older version of $(var.MyProductName) that cannot be upgraded is already installed. You must uninstall it before you can install this version.">
+            NOT OLDVERSIONINSTALLED
+        </Condition>
+
+        <!-- Determine OS architecture. -->
         <Property Id="OSARCH" Secure="yes" Value="AMD64">
             <RegistrySearch
                 Id="R.OSARCH"
@@ -31,10 +48,10 @@
                 Type="raw" />
         </Property>
 
-        <Property Id="P.LauncherName">$(var.MyProductName).Launcher</Property>
-        <Property Id="P.LauncherRegistryKey">Software\$(var.MyProductName)\Services</Property>
+        <!-- Setup INSTALLDIR and SXSDIR from the registry or defaults. -->
         <Property Id="P.RegistryKey">Software\$(var.MyProductName)</Property>
-        <Property Id="INSTALLDIR">
+        <Property Id="P.LauncherRegistryKey">Software\$(var.MyProductName)\Services</Property>
+        <Property Id="INSTALLDIR" Secure="yes">
             <RegistrySearch
                 Id="R.INSTALLDIR"
                 Root="HKLM"
@@ -42,22 +59,40 @@
                 Name="InstallDir"
                 Type="raw" />
         </Property>
+        <Property Id="SXSDIR" Secure="yes">
+            <RegistrySearch
+                Id="R.SXSDIR"
+                Root="HKLM"
+                Key="[P.RegistryKey]"
+                Name="SxsDir"
+                Type="raw" />
+        </Property>
+        <SetProperty Id="INSTALLDIR" Value="[ProgramFilesFolder]$(var.MyProductName)\" After="CostInitialize">
+            NOT INSTALLDIR
+        </SetProperty>
+        <SetProperty Id="SXSDIR" Value="[INSTALLDIR]SxS\sxs.[InstanceID]\" After="SetINSTALLDIR">
+            ((NOT SXSDIR) OR WIX_UPGRADE_DETECTED) AND InstanceID
+        </SetProperty>
 
+        <!-- Setup directory structure. -->
         <Directory Id="TARGETDIR" Name="SourceDir">
             <Directory Id="ProgramFilesFolder">
-                <Directory Id="INSTALLDIR" Name="$(var.MyProductName)">
+                <Directory Id="INSTALLDIR" Name="DYNAMIC">
+                    <Directory Id="SXSBASEDIR" Name="SxS">
+                        <Directory Id="SXSDIR" Name="DYNAMIC">
                             <Directory Id="BINDIR" Name="bin" />
+                        </Directory>
+                    </Directory>
                     <Directory Id="INCDIR" Name="inc" />
                     <Directory Id="LIBDIR" Name="lib" />
                     <Directory Id="OPTDIR" Name="opt" />
                     <Directory Id="SMPDIR" Name="samples" />
-                    <Directory Id="SYMDIR" Name="sym" />
                 </Directory>
             </Directory>
         </Directory>
 
         <DirectoryRef Id="INSTALLDIR">
-            <Component Id="C.INSTALLDIR" Guid="{F876F26E-5016-4AC6-93B3-653C0312A6CE}">
+            <Component Id="C.INSTALLDIR" Guid="C086521F-8552-43D1-AAE2-CDD579F66FDD">
                 <RegistryValue
                     Root="HKLM"
                     Key="[P.RegistryKey]"
@@ -70,6 +105,17 @@
                 <File Name="License.txt" Source="..\..\..\License.txt" KeyPath="yes" />
             </Component>
         </DirectoryRef>
+        <DirectoryRef Id="SXSDIR">
+            <Component Id="C.SXSDIR" Guid="0F09CD39-1137-4DB8-A783-27B1F51353D1">
+                <RegistryValue
+                    Root="HKLM"
+                    Key="[P.RegistryKey]"
+                    Name="SxsDir"
+                    Type="string"
+                    Value="[SXSDIR]"
+                    KeyPath="yes" />
+            </Component>
+        </DirectoryRef>
         <DirectoryRef Id="BINDIR" FileSource="..\build\$(var.Configuration)">
             <Component Id="C.$(var.MyProductFileName)_a64.sys">
                 <File Name="$(var.MyProductFileName)-a64.sys" KeyPath="yes" />
@@ -82,56 +128,56 @@
             </Component>
 
             <!-- On WinArm64 register $(var.MyProductFileName)-a64.dll -->
-            <Component Id="C.$(var.MyProductFileName)_a64.dll.a64" Guid="86FB483B-0910-458E-93B4-3CCB66D27AF0">
+            <Component Id="C.$(var.MyProductFileName)_a64.dll.a64" Guid="2A7E68EB-D05F-4DD8-ABF2-EB8CB09697F0">
                 <File Id="FILE.$(var.MyProductFileName)_a64.dll.a64" Name="$(var.MyProductFileName)-a64.dll" KeyPath="yes" SelfRegCost="1" />
                 <Condition><![CDATA[OSARCH = "ARM64"]]></Condition>
             </Component>
-            <Component Id="C.$(var.MyProductFileName)_x64.dll.a64" Guid="941FAE3E-A650-4BAC-97F5-F8C6E98DB5D2">
+            <Component Id="C.$(var.MyProductFileName)_x64.dll.a64" Guid="EA5ED4FB-FC72-4D27-9802-88D84DAE61B4">
                 <File Id="FILE.$(var.MyProductFileName)_x64.dll.a64" Name="$(var.MyProductFileName)-x64.dll" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "ARM64"]]></Condition>
             </Component>
-            <Component Id="C.$(var.MyProductFileName)_x86.dll.a64" Guid="C312214D-F9A3-40EB-B2C3-4FAF5BF3F938">
+            <Component Id="C.$(var.MyProductFileName)_x86.dll.a64" Guid="2A9BD712-2F96-4794-8A58-929E39F3F3CC">
                 <File Id="FILE.$(var.MyProductFileName)_x86.dll.a64" Name="$(var.MyProductFileName)-x86.dll" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "ARM64"]]></Condition>
             </Component>
 
             <!-- On Win64 register $(var.MyProductFileName)-x64.dll -->
-            <Component Id="C.$(var.MyProductFileName)_a64.dll.x64" Guid="4ABB46C2-A8E3-49E8-B051-05DBF2B351AE">
+            <Component Id="C.$(var.MyProductFileName)_a64.dll.x64" Guid="026DA201-43E1-450C-9687-8A684FBF2D2D">
                 <File Id="FILE.$(var.MyProductFileName)_a64.dll.x64" Name="$(var.MyProductFileName)-a64.dll" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "AMD64"]]></Condition>
             </Component>
-            <Component Id="C.$(var.MyProductFileName)_x64.dll.x64" Guid="F0A67746-1A9C-4976-8EC0-882E9407FA6D">
+            <Component Id="C.$(var.MyProductFileName)_x64.dll.x64" Guid="89201BAF-5812-4ECE-91CD-12EDFFF11CB1">
                 <File Id="FILE.$(var.MyProductFileName)_x64.dll.x64" Name="$(var.MyProductFileName)-x64.dll" KeyPath="yes" SelfRegCost="1" />
                 <Condition><![CDATA[OSARCH = "AMD64"]]></Condition>
             </Component>
-            <Component Id="C.$(var.MyProductFileName)_x86.dll.x64" Guid="950492FB-12F7-4E27-9124-8325A2BC9927">
+            <Component Id="C.$(var.MyProductFileName)_x86.dll.x64" Guid="E6EE48A4-6BC7-4135-9A2F-FBBA30DE80BE">
                 <File Id="FILE.$(var.MyProductFileName)_x86.dll.x64" Name="$(var.MyProductFileName)-x86.dll" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "AMD64"]]></Condition>
             </Component>
 
             <!-- On Win32 register $(var.MyProductFileName)-x86.dll -->
-            <Component Id="C.$(var.MyProductFileName)_a64.dll.x86" Guid="071C0EB2-A0EB-46A1-B5B0-124F60ECD6B3">
+            <Component Id="C.$(var.MyProductFileName)_a64.dll.x86" Guid="2B264958-DECC-4B32-9BB2-DE32D6B6BE77">
                 <File Id="FILE.$(var.MyProductFileName)_a64.dll.x86" Name="$(var.MyProductFileName)-a64.dll" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "x86"]]></Condition>
             </Component>
-            <Component Id="C.$(var.MyProductFileName)_x64.dll.x86" Guid="4D6E7A8E-0CA6-49BE-B312-1EDADE725756">
+            <Component Id="C.$(var.MyProductFileName)_x64.dll.x86" Guid="29FB908F-1D36-4789-9778-4CE2E9C19CEA">
                 <File Id="FILE.$(var.MyProductFileName)_x64.dll.x86" Name="$(var.MyProductFileName)-x64.dll" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "x86"]]></Condition>
             </Component>
-            <Component Id="C.$(var.MyProductFileName)_x86.dll.x86" Guid="F0DEF7A6-AF55-419F-A58A-DF4018C6FA73">
+            <Component Id="C.$(var.MyProductFileName)_x86.dll.x86" Guid="80E87D91-69A8-4942-ABC1-36652B1CA700">
                 <File Id="FILE.$(var.MyProductFileName)_x86.dll.x86" Name="$(var.MyProductFileName)-x86.dll" KeyPath="yes" SelfRegCost="1" />
                 <Condition><![CDATA[OSARCH = "x86"]]></Condition>
             </Component>
 
             <!-- install assembly -->
-            <Component Id="C.$(var.MyProductFileName)_msil.dll" Guid="0D8BA6AE-9F87-402B-AE1A-95B0AE3BE179">
+            <Component Id="C.$(var.MyProductFileName)_msil.dll" Guid="1772CDE5-4B2F-48CF-B2DA-CA43818053A8">
                 <File Id="FILE.$(var.MyProductFileName)_msil.dll" Name="$(var.MyProductFileName)-msil.dll" KeyPath="yes" />
             </Component>
-            <Component Id="C.$(var.MyProductFileName)_msil.xml" Guid="1657F707-C112-454C-91AE-0FDEBBF454AB">
+            <Component Id="C.$(var.MyProductFileName)_msil.xml" Guid="C76745D2-51FA-4028-B827-3F2F3F763751">
                 <File Id="FILE.$(var.MyProductFileName)_msil.xml" Name="$(var.MyProductFileName)-msil.xml" KeyPath="yes" />
             </Component>
             <!--
-            <Component Id="C.$(var.MyProductFileName)_msil.dll.GAC" Guid="6469467D-8C90-4889-8138-4028F9DA6E85">
+            <Component Id="C.$(var.MyProductFileName)_msil.dll.GAC" Guid="D86F8764-2FCC-43DA-A174-23E0FD6D45B7">
                 <File Id="FILE.$(var.MyProductFileName)_msil.dll.GAC" Name="$(var.MyProductFileName)-msil.dll" KeyPath="yes" Assembly=".net" />
             </Component>
             <Component Id="C.policy.$(var.MyProductFileName)_msil.dll.GAC">
@@ -141,103 +187,103 @@
             -->
 
             <!-- On WinArm64 ServiceInstall launcher-a64.exe -->
-            <Component Id="C.launcher_a64.exe.a64" Guid="E37E6D75-C44B-4189-8E86-CE5A3E0B0626">
+            <Component Id="C.launcher_a64.exe.a64" Guid="D8B657EA-7B08-48D1-B5F7-76CFB68E1BD5">
                 <File Id="FILE.launcher_a64.exe.a64" Name="launcher-a64.exe" KeyPath="yes" />
                 <ServiceInstall
                     Id="launcher_a64.exe.a64"
-                    Name="[P.LauncherName]"
+                    Name="$(var.MyProductName).Launcher"
                     Description="$(var.MyDescription)"
                     Type="ownProcess"
                     Start="auto"
                     ErrorControl="ignore" />
                 <ServiceControl
                     Id="launcher_a64.exe.a64"
-                    Name="[P.LauncherName]"
+                    Name="$(var.MyProductName).Launcher"
                     Start="install"
                     Stop="both"
                     Remove="uninstall" />
                 <Condition><![CDATA[OSARCH = "ARM64"]]></Condition>
             </Component>
-            <Component Id="C.launcher_x64.exe.a64" Guid="CF5F3EEE-F739-4F50-9938-13C0D2CD9C7A">
+            <Component Id="C.launcher_x64.exe.a64" Guid="3EFC0561-6EA2-4E7E-B707-C2EA706CFBA0">
                 <File Id="FILE.launcher_x64.exe.a64" Name="launcher-x64.exe" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "ARM64"]]></Condition>
             </Component>
-            <Component Id="C.launcher_x86.exe.a64" Guid="D5E9FF96-9E00-46BA-8719-BC49CF35BBE6">
+            <Component Id="C.launcher_x86.exe.a64" Guid="69F16682-10AE-4FC4-9007-8D80CE0D8388">
                 <File Id="FILE.launcher_x86.exe.a64" Name="launcher-x86.exe" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "ARM64"]]></Condition>
             </Component>
 
             <!-- On Win64 ServiceInstall launcher-x64.exe -->
-            <Component Id="C.launcher_a64.exe.x64" Guid="10A3F0F9-6555-4071-9C93-EA50E4B3F115">
+            <Component Id="C.launcher_a64.exe.x64" Guid="29760ACE-69CD-4061-8C0C-8A6E72D23A45">
                 <File Id="FILE.launcher_a64.exe.x64" Name="launcher-a64.exe" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "AMD64"]]></Condition>
             </Component>
-            <Component Id="C.launcher_x64.exe.x64" Guid="2AB4E729-F7CB-4B4A-BE81-6C0C3B3194FC">
+            <Component Id="C.launcher_x64.exe.x64" Guid="36ACBA60-1C92-4D2A-B497-CD4FB13A042F">
                 <File Id="FILE.launcher_x64.exe.x64" Name="launcher-x64.exe" KeyPath="yes" />
                 <ServiceInstall
                     Id="launcher_x64.exe.x64"
-                    Name="[P.LauncherName]"
+                    Name="$(var.MyProductName).Launcher"
                     Description="$(var.MyDescription)"
                     Type="ownProcess"
                     Start="auto"
                     ErrorControl="ignore" />
                 <ServiceControl
                     Id="launcher_x64.exe.x64"
-                    Name="[P.LauncherName]"
+                    Name="$(var.MyProductName).Launcher"
                     Start="install"
                     Stop="both"
                     Remove="uninstall" />
                 <Condition><![CDATA[OSARCH = "AMD64"]]></Condition>
             </Component>
-            <Component Id="C.launcher_x86.exe.x64" Guid="C5B6D411-8A6A-4944-8C4F-7D9FB9A72826">
+            <Component Id="C.launcher_x86.exe.x64" Guid="98F17F67-AC1D-4E16-A147-B7AE113E3CB3">
                 <File Id="FILE.launcher_x86.exe.x64" Name="launcher-x86.exe" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "AMD64"]]></Condition>
             </Component>
 
             <!-- On Win32 ServiceInstall launcher-x86.exe -->
-            <Component Id="C.launcher_a64.exe.x86" Guid="5048AEF5-9DE2-406E-A2EA-F237BAD13286">
+            <Component Id="C.launcher_a64.exe.x86" Guid="9024A9FE-7445-4241-ADA3-82A57C92719A">
                 <File Id="FILE.launcher_a64.exe.x86" Name="launcher-a64.exe" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "x86"]]></Condition>
             </Component>
-            <Component Id="C.launcher_x64.exe.x86" Guid="88CDBE92-8B67-485A-838F-FA4AD37F306F">
+            <Component Id="C.launcher_x64.exe.x86" Guid="A85DA9CD-26AA-460E-950D-CA9692B87465">
                 <File Id="FILE.launcher_x64.exe.x86" Name="launcher-x64.exe" KeyPath="yes" />
                 <Condition><![CDATA[OSARCH = "x86"]]></Condition>
             </Component>
-            <Component Id="C.launcher_x86.exe.x86" Guid="E995D906-0273-4758-9B26-99A3A8CD143A">
+            <Component Id="C.launcher_x86.exe.x86" Guid="01FCCF6B-9F4B-4F29-8149-489470FFD449">
                 <File Id="FILE.launcher_x86.exe.x86" Name="launcher-x86.exe" KeyPath="yes" />
                 <ServiceInstall
                     Id="launcher_x86.exe.x86"
-                    Name="[P.LauncherName]"
+                    Name="$(var.MyProductName).Launcher"
                     Description="$(var.MyDescription)"
                     Type="ownProcess"
                     Start="auto"
                     ErrorControl="ignore" />
                 <ServiceControl
                     Id="launcher_x86.exe.x86"
-                    Name="[P.LauncherName]"
+                    Name="$(var.MyProductName).Launcher"
                     Start="install"
                     Stop="both"
                     Remove="uninstall" />
                 <Condition><![CDATA[OSARCH = "x86"]]></Condition>
             </Component>
 
-            <Component Id="C.launchctl_a64.exe" Guid="B9B5CF8E-317D-40EE-A208-BC46A2A99BAB">
+            <Component Id="C.launchctl_a64.exe" Guid="A7D830DD-20D2-48BF-85B6-E306BCCAFD2D">
                 <File Name="launchctl-a64.exe" KeyPath="yes" />
             </Component>
-            <Component Id="C.launchctl_x64.exe" Guid="2753623B-66F1-4514-B9C7-F879178DFF49">
+            <Component Id="C.launchctl_x64.exe" Guid="CCC8974A-4CD0-443E-840D-1C92535BBD04">
                 <File Name="launchctl-x64.exe" KeyPath="yes" />
             </Component>
-            <Component Id="C.launchctl_x86.exe" Guid="EBDEC4FB-07BB-47CA-BFFF-EB854CA2D22D">
+            <Component Id="C.launchctl_x86.exe" Guid="6E382342-10D4-4274-8FA9-F1B44C40C277">
                 <File Name="launchctl-x86.exe" KeyPath="yes" />
             </Component>
 
-            <Component Id="C.fsptool_a64.exe" Guid="F75A8B14-000C-4933-AD83-EC0D1D3AD3CA">
+            <Component Id="C.fsptool_a64.exe" Guid="8ACEB970-CAD5-491D-8CE8-12675CC0E812">
                 <File Name="fsptool-a64.exe" KeyPath="yes" />
             </Component>
-            <Component Id="C.fsptool_x64.exe" Guid="013FE508-097D-4433-9C60-717F5446E7F4">
+            <Component Id="C.fsptool_x64.exe" Guid="35EE49E2-9565-4FA2-A0AC-D51FD94FA380">
                 <File Name="fsptool-x64.exe" KeyPath="yes" />
             </Component>
-            <Component Id="C.fsptool_x86.exe" Guid="6C16DC2C-E12F-49FB-A665-3AF0475487AD">
+            <Component Id="C.fsptool_x86.exe" Guid="0E6D5742-D500-4E24-A0FA-E6316DB70D8B">
                 <File Name="fsptool-x86.exe" KeyPath="yes" />
             </Component>
 
@@ -409,7 +455,7 @@
             </Component>
 
             <!-- On WinArm64 copy fuse-a64.pc -->
-            <Component Id="C.fuse_a64.pc" Guid="74E6E9BD-AF16-4635-AE52-84B33E4E196E">
+            <Component Id="C.fuse_a64.pc" Guid="776C28B5-DA1A-4EB6-96E6-3D22FE1573AC">
                 <File
                     Id="FILE.fuse_a64.pc"
                     Name="fuse.pc"
@@ -419,7 +465,7 @@
             </Component>
 
             <!-- On Win64 copy fuse-x64.pc -->
-            <Component Id="C.fuse_x64.pc" Guid="407395D2-D076-411E-B1D0-D97E21E11A3C">
+            <Component Id="C.fuse_x64.pc" Guid="89D39F6E-2994-4E6F-ACB6-5B544057C051">
                 <File
                     Id="FILE.fuse_x64.pc"
                     Name="fuse.pc"
@@ -429,7 +475,7 @@
             </Component>
 
             <!-- On Win32 copy fuse-x86.pc -->
-            <Component Id="C.fuse_x86.pc" Guid="0568EBCB-782E-4C17-9B64-BAFCC43F64ED">
+            <Component Id="C.fuse_x86.pc" Guid="75637ECD-B3EC-4A19-98B7-9AFAB0722D9A">
                 <File
                     Id="FILE.fuse_x86.pc"
                     Name="fuse.pc"
@@ -439,7 +485,7 @@
             </Component>
 
             <!-- On WinArm64 copy fuse3-x64.pc -->
-            <Component Id="C.fuse3_a64.pc" Guid="2B6444DB-25E5-45B4-BC61-157D3B992F2B">
+            <Component Id="C.fuse3_a64.pc" Guid="5A69B633-11E4-46E4-8D08-BED1BE7BF4F0">
                 <File
                     Id="FILE.fuse3_a64.pc"
                     Name="fuse3.pc"
@@ -449,7 +495,7 @@
             </Component>
 
             <!-- On Win64 copy fuse3-x64.pc -->
-            <Component Id="C.fuse3_x64.pc" Guid="FE59E3BA-E5EA-4822-80B1-19A1DE6B62C7">
+            <Component Id="C.fuse3_x64.pc" Guid="EEAF35B5-5D6C-47D6-BEE3-5E44DD5A294B">
                 <File
                     Id="FILE.fuse3_x64.pc"
                     Name="fuse3.pc"
@@ -459,7 +505,7 @@
             </Component>
 
             <!-- On Win32 copy fuse3-x86.pc -->
-            <Component Id="C.fuse3_x86.pc" Guid="176205D0-07EA-4DFC-947F-18E89ABDAFAB">
+            <Component Id="C.fuse3_x86.pc" Guid="476CF5E5-2B8E-4D75-B1A5-FFA8C3DAECB2">
                 <File
                     Id="FILE.fuse3_x86.pc"
                     Name="fuse3.pc"
@@ -737,62 +783,6 @@
                 </Component>
             </Directory>
         </DirectoryRef>
-        <DirectoryRef Id="SYMDIR">
-            <Component Id="C.$(var.MyProductFileName)_a64.sys.pdb">
-                <File Name="$(var.MyProductFileName)-a64.sys.pdb" Source="..\build\$(var.Configuration)\$(var.MyProductFileName)-a64.sys.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.$(var.MyProductFileName)_x64.sys.pdb">
-                <File Name="$(var.MyProductFileName)-x64.sys.pdb" Source="..\build\$(var.Configuration)\$(var.MyProductFileName)-x64.sys.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.$(var.MyProductFileName)_x86.sys.pdb">
-                <File Name="$(var.MyProductFileName)-x86.sys.pdb" Source="..\build\$(var.Configuration)\$(var.MyProductFileName)-x86.sys.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.$(var.MyProductFileName)_a64.dll.pdb">
-                <File Name="$(var.MyProductFileName)-a64.dll.pdb" Source="..\build\$(var.Configuration)\$(var.MyProductFileName)-a64.dll.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.$(var.MyProductFileName)_x64.dll.pdb">
-                <File Name="$(var.MyProductFileName)-x64.dll.pdb" Source="..\build\$(var.Configuration)\$(var.MyProductFileName)-x64.dll.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.$(var.MyProductFileName)_x86.dll.pdb">
-                <File Name="$(var.MyProductFileName)-x86.dll.pdb" Source="..\build\$(var.Configuration)\$(var.MyProductFileName)-x86.dll.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.launcher_a64.pdb">
-                <File Name="launcher-a64.pdb" Source="..\build\$(var.Configuration)\launcher-a64.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.launcher_x64.pdb">
-                <File Name="launcher-x64.pdb" Source="..\build\$(var.Configuration)\launcher-x64.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.launcher_x86.pdb">
-                <File Name="launcher-x86.pdb" Source="..\build\$(var.Configuration)\launcher-x86.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.launchctl_a64.pdb">
-                <File Name="launchctl-a64.pdb" Source="..\build\$(var.Configuration)\launchctl-a64.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.launchctl_x64.pdb">
-                <File Name="launchctl-x64.pdb" Source="..\build\$(var.Configuration)\launchctl-x64.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.launchctl_x86.pdb">
-                <File Name="launchctl-x86.pdb" Source="..\build\$(var.Configuration)\launchctl-x86.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.fsptool_a64.pdb">
-                <File Name="fsptool-a64.pdb" Source="..\build\$(var.Configuration)\fsptool-a64.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.fsptool_x64.pdb">
-                <File Name="fsptool-x64.pdb" Source="..\build\$(var.Configuration)\fsptool-x64.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.fsptool_x86.pdb">
-                <File Name="fsptool-x86.pdb" Source="..\build\$(var.Configuration)\fsptool-x86.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.memfs_a64.pdb">
-                <File Name="memfs-a64.pdb" Source="..\build\$(var.Configuration)\memfs-a64.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.memfs_x64.pdb">
-                <File Name="memfs-x64.pdb" Source="..\build\$(var.Configuration)\memfs-x64.public.pdb" KeyPath="yes" />
-            </Component>
-            <Component Id="C.memfs_x86.pdb">
-                <File Name="memfs-x86.pdb" Source="..\build\$(var.Configuration)\memfs-x86.public.pdb" KeyPath="yes" />
-            </Component>
-        </DirectoryRef>
 
         <ComponentGroup Id="C.$(var.MyProductName).bin">
             <ComponentRef Id="C.$(var.MyProductFileName)_a64.sys" />
@@ -927,26 +917,6 @@
             <ComponentRef Id="C.notifyfs.vcxproj" />
             <ComponentRef Id="C.notifyfs.vcxproj.filters" />
         </ComponentGroup>
-        <ComponentGroup Id="C.$(var.MyProductName).sym">
-            <ComponentRef Id="C.$(var.MyProductFileName)_a64.sys.pdb" />
-            <ComponentRef Id="C.$(var.MyProductFileName)_x64.sys.pdb" />
-            <ComponentRef Id="C.$(var.MyProductFileName)_x86.sys.pdb" />
-            <ComponentRef Id="C.$(var.MyProductFileName)_a64.dll.pdb" />
-            <ComponentRef Id="C.$(var.MyProductFileName)_x64.dll.pdb" />
-            <ComponentRef Id="C.$(var.MyProductFileName)_x86.dll.pdb" />
-            <ComponentRef Id="C.launcher_a64.pdb" />
-            <ComponentRef Id="C.launcher_x64.pdb" />
-            <ComponentRef Id="C.launcher_x86.pdb" />
-            <ComponentRef Id="C.launchctl_a64.pdb" />
-            <ComponentRef Id="C.launchctl_x64.pdb" />
-            <ComponentRef Id="C.launchctl_x86.pdb" />
-            <ComponentRef Id="C.fsptool_a64.pdb" />
-            <ComponentRef Id="C.fsptool_x64.pdb" />
-            <ComponentRef Id="C.fsptool_x86.pdb" />
-            <ComponentRef Id="C.memfs_a64.pdb" />
-            <ComponentRef Id="C.memfs_x64.pdb" />
-            <ComponentRef Id="C.memfs_x86.pdb" />
-        </ComponentGroup>
         <ComponentGroup Id="C.$(var.MyProductName).net">
             <ComponentRef Id="C.$(var.MyProductFileName)_msil.dll" />
             <ComponentRef Id="C.$(var.MyProductFileName)_msil.xml" />
@@ -978,6 +948,7 @@
             Absent="disallow">
             <ComponentRef Id="C.INSTALLDIR" />
             <ComponentRef Id="C.License.txt" />
+            <ComponentRef Id="C.SXSDIR" />
             <Feature
                 Id="F.User"
                 Level="1"
@@ -1013,7 +984,6 @@
                 <ComponentGroupRef Id="C.$(var.MyProductName).lib" />
                 <ComponentGroupRef Id="C.$(var.MyProductName).smp" />
                 <ComponentGroupRef Id="C.$(var.MyProductName).smp.net" />
-                <ComponentGroupRef Id="C.$(var.MyProductName).sym" />
             </Feature>
             <Feature
                 Id="F.KernelDeveloper"
@@ -1056,7 +1026,24 @@
                 Order="10">NOT Installed</Publish>
         </UI>
 
+        <!-- Custom Actions -->
         <Binary Id="CustomActions" SourceFile="..\build\$(var.Configuration)\CustomActions.dll" />
+
+        <!-- InstanceID computes a unique per-installer-run ID -->
+        <CustomAction
+            Id="Action.InstanceID"
+            BinaryKey="CustomActions"
+            DllEntry="InstanceID"
+            Execute="firstSequence"
+            Return="check" />
+        <InstallExecuteSequence>
+            <Custom Action="Action.InstanceID" Before="AppSearch" />
+        </InstallExecuteSequence>
+        <InstallUISequence>
+            <Custom Action="Action.InstanceID" Before="AppSearch" />
+        </InstallUISequence>
+
+        <!-- ServiceRunning determines if the old driver (that did not support unload) is running. -->
         <CustomAction
             Id="Params.ServiceRunning"
             Property="ServiceRunning"
@@ -1069,16 +1056,109 @@
             Return="ignore" />
         <CustomAction
             Id="Action.ServiceRunning.Error"
-            Error="The $(var.MyProductName) service appears to be running. If you just uninstalled $(var.MyProductName) please restart your computer. If you are running a development version of $(var.MyProductName) please remove it before proceeding." />
+            Error="A component from an older version of $(var.MyProductName) that cannot be upgraded appears to be running. If you just uninstalled an older version of $(var.MyProductName) please restart your computer." />
         <InstallExecuteSequence>
             <Custom Action="Params.ServiceRunning" Before="Action.ServiceRunning" />
-            <Custom Action="Action.ServiceRunning" Before="LaunchConditions" />
+            <Custom Action="Action.ServiceRunning" After="LaunchConditions">
+                <![CDATA[NOT Installed]]>
+            </Custom>
             <Custom Action="Action.ServiceRunning.Error" After="Action.ServiceRunning">
                 <![CDATA[NOT Installed AND (0 <> ServiceRunning)]]>
             </Custom>
-            <ScheduleReboot After="RemoveFiles">
-                <![CDATA[(REMOVE ~= "ALL") AND (0 <> ServiceRunning)]]>
-            </ScheduleReboot>
         </InstallExecuteSequence>
+        <InstallUISequence>
+            <Custom Action="Params.ServiceRunning" Before="Action.ServiceRunning" />
+            <Custom Action="Action.ServiceRunning" After="LaunchConditions">
+                <![CDATA[NOT Installed]]>
+            </Custom>
+            <Custom Action="Action.ServiceRunning.Error" After="Action.ServiceRunning">
+                <![CDATA[NOT Installed AND (0 <> ServiceRunning)]]>
+            </Custom>
+        </InstallUISequence>
+
+        <!-- InstallSymlinks installs SxS symlinks -->
+        <SetProperty
+            Id="Deferred.InstallSymlinks"
+            Value='InstallJunctions "[INSTALLDIR]\" "[SXSDIR]\" bin'
+            Before="Deferred.InstallSymlinks"
+            Sequence="execute" />
+        <CustomAction
+            Id="Deferred.InstallSymlinks"
+            BinaryKey="CustomActions"
+            DllEntry="DeferredAction"
+            Execute="deferred"
+            Impersonate="no"
+            Return="check" />
+        <SetProperty
+            Id="Rollback.InstallSymlinks"
+            Value='RemoveFiles "[INSTALLDIR]\" bin'
+            Before="Rollback.InstallSymlinks"
+            Sequence="execute" />
+        <CustomAction
+            Id="Rollback.InstallSymlinks"
+            BinaryKey="CustomActions"
+            DllEntry="DeferredAction"
+            Execute="rollback"
+            Impersonate="no"
+            Return="ignore" />
+        <InstallExecuteSequence>
+            <!--
+                deferred: `InstallSymlinks` on install or repair
+                rollback: `RemoveSymlinks` on install only
+            -->
+            <Custom Action="Rollback.InstallSymlinks" After="InstallFiles">
+                NOT Installed
+            </Custom>
+            <Custom Action="Deferred.InstallSymlinks" After="Rollback.InstallSymlinks">
+                (NOT Installed) OR REINSTALL
+            </Custom>
+        </InstallExecuteSequence>
+
+        <!-- RemoveSymlinks removes SxS symlinks -->
+        <SetProperty
+            Id="Deferred.RemoveSymlinks"
+            Value='RemoveFiles "[INSTALLDIR]\" bin'
+            Before="Deferred.RemoveSymlinks"
+            Sequence="execute" />
+        <CustomAction
+            Id="Deferred.RemoveSymlinks"
+            BinaryKey="CustomActions"
+            DllEntry="DeferredAction"
+            Execute="deferred"
+            Impersonate="no"
+            Return="ignore" />
+        <SetProperty
+            Id="Rollback.RemoveSymlinks"
+            Value='InstallJunctions "[INSTALLDIR]\" "[SXSDIR]\" bin'
+            Before="Rollback.RemoveSymlinks"
+            Sequence="execute" />
+        <CustomAction
+            Id="Rollback.RemoveSymlinks"
+            BinaryKey="CustomActions"
+            DllEntry="DeferredAction"
+            Execute="rollback"
+            Impersonate="no"
+            Return="check" />
+        <InstallExecuteSequence>
+            <!--
+                deferred: `RemoveSymlinks` on uninstall
+                rollback: `InstallSymlinks` on uninstall
+            -->
+            <Custom Action="Rollback.RemoveSymlinks" Before="RemoveFiles">
+                REMOVE ~= "ALL"
+            </Custom>
+            <Custom Action="Deferred.RemoveSymlinks" After="Rollback.RemoveSymlinks">
+                REMOVE ~= "ALL"
+            </Custom>
+        </InstallExecuteSequence>
+
+        <!--
+            Specify WIXFAILWHENDEFERRED=1 on the msiexec cmdline for rollback testing.
+            See http://tinyurl.com/yxkaywek
+        -->
+        <!--
+        <Property Id="WIXFAILWHENDEFERRED" Value="0" Secure="yes" />
+        <CustomActionRef Id="WixFailWhenDeferred" />
+        -->
     </Product>
 </Wix>

build/VStudio/installer/winfsp_msi.wixproj

@@ -20,7 +20,7 @@
     <SuppressAllWarnings>False</SuppressAllWarnings>
     <Pedantic>True</Pedantic>
     <SuppressPdbOutput>True</SuppressPdbOutput>
-    <SuppressIces>ICE30</SuppressIces>
+    <SuppressIces>ICE30;ICE61</SuppressIces>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
     <OutputPath>$(SolutionDir)build\$(Configuration)\</OutputPath>
@@ -29,12 +29,16 @@
     <SuppressAllWarnings>False</SuppressAllWarnings>
     <Pedantic>True</Pedantic>
     <SuppressPdbOutput>True</SuppressPdbOutput>
-    <SuppressIces>ICE30</SuppressIces>
+    <SuppressIces>ICE30;ICE61</SuppressIces>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Product.wxs" />
   </ItemGroup>
   <ItemGroup>
+    <WixExtension Include="WixUtilExtension">
+      <HintPath>$(WixExtDir)\WixUtilExtension.dll</HintPath>
+      <Name>WixUtilExtension</Name>
+    </WixExtension>
     <WixExtension Include="WixUIExtension">
       <HintPath>$(WixExtDir)\WixUIExtension.dll</HintPath>
       <Name>WixUIExtension</Name>

build/VStudio/testing/memfs-dotnet.csproj

@@ -1,27 +1,30 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project>
+  <PropertyGroup>
+    <BaseIntermediateOutputPath>$(SolutionDir)build\$(MSBuildProjectName).build\</BaseIntermediateOutputPath>
+  </PropertyGroup>
+  <Import Project="Sdk.props" Sdk="Microsoft.NET.Sdk" />
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), build.common.props))/build.common.props" />
-  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{4920E350-D496-4652-AE98-6C4208AEC1D8}</ProjectGuid>
     <OutputType>Exe</OutputType>
     <ProjectName>memfs-dotnet</ProjectName>
-    <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>memfs</RootNamespace>
     <AssemblyName>memfs-dotnet-msil</AssemblyName>
-    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <TargetFramework>net452</TargetFramework>
     <FileAlignment>512</FileAlignment>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
+  <PropertyGroup>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
+  </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>$(SolutionDir)build\$(Configuration)\</OutputPath>
-    <BaseIntermediateOutputPath>$(SolutionDir)build\$(ProjectName).build\</BaseIntermediateOutputPath>
     <IntermediateOutputPath>$(BaseIntermediateOutputPath)$(Configuration)\</IntermediateOutputPath>
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
@@ -33,32 +36,16 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>$(SolutionDir)build\$(Configuration)\</OutputPath>
-    <BaseIntermediateOutputPath>$(SolutionDir)build\$(ProjectName).build\</BaseIntermediateOutputPath>
     <IntermediateOutputPath>$(BaseIntermediateOutputPath)$(Configuration)\</IntermediateOutputPath>
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="System" />
+    <ProjectReference Include="..\dotnet\winfsp.net.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="..\..\..\tst\memfs-dotnet\Program.cs">
-      <Link>Program.cs</Link>
-    </Compile>
+    <Compile Include="..\..\..\tst\memfs-dotnet\Program.cs" />
   </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\dotnet\winfsp.net.csproj">
-      <Project>{94580219-cc8d-4fe5-a3be-437b0b3481e1}</Project>
-      <Name>winfsp.net</Name>
-    </ProjectReference>
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
-  <Target Name="BeforeBuild">
-  </Target>
-  <Target Name="AfterBuild">
-  </Target>
-  -->
+  <Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk" />
 </Project>

build/VStudio/testing/winfsp-tests.vcxproj

@@ -284,6 +284,7 @@
     <ClCompile Include="..\..\..\tst\winfsp-tests\security-test.c" />
     <ClCompile Include="..\..\..\tst\winfsp-tests\stream-tests.c" />
     <ClCompile Include="..\..\..\tst\winfsp-tests\timeout-test.c" />
+    <ClCompile Include="..\..\..\tst\winfsp-tests\loadun-test.c" />
     <ClCompile Include="..\..\..\tst\winfsp-tests\uuid5-test.c" />
     <ClCompile Include="..\..\..\tst\winfsp-tests\version-test.c" />
     <ClCompile Include="..\..\..\tst\winfsp-tests\volpath-test.c" />

build/VStudio/testing/winfsp-tests.vcxproj.filters

@@ -112,6 +112,9 @@
     <ClCompile Include="..\..\..\tst\winfsp-tests\notify-test.c">
       <Filter>Source</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\tst\winfsp-tests\loadun-test.c">
+      <Filter>Source</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\ext\tlib\testsuite.h">

build/VStudio/winfsp_dll.vcxproj

@@ -73,6 +73,7 @@
     <ClCompile Include="..\..\src\dll\ntstatus.c" />
     <ClCompile Include="..\..\src\dll\path.c" />
     <ClCompile Include="..\..\src\dll\service.c" />
+    <ClCompile Include="..\..\src\dll\sxs.c" />
     <ClCompile Include="..\..\src\dll\util.c" />
     <ClCompile Include="..\..\src\dll\wksid.c" />
     <ClCompile Include="..\..\src\shared\ku\mountmgr.c" />

build/VStudio/winfsp_dll.vcxproj.filters

@@ -178,6 +178,9 @@
     <ClCompile Include="..\..\src\shared\ku\mountmgr.c">
       <Filter>Source\shared\ku</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\dll\sxs.c">
+      <Filter>Source</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\src\dll\library.def">

build/VStudio/winfsp_sys.vcxproj

@@ -260,6 +260,7 @@
     <ClCompile Include="..\..\src\sys\shutdown.c" />
     <ClCompile Include="..\..\src\sys\silo.c" />
     <ClCompile Include="..\..\src\sys\statistics.c" />
+    <ClCompile Include="..\..\src\sys\sxs.c" />
     <ClCompile Include="..\..\src\sys\trace.c" />
     <ClCompile Include="..\..\src\sys\util.c" />
     <ClCompile Include="..\..\src\sys\volinfo.c" />
@@ -290,6 +291,9 @@
       <Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">set DriverFile=$(TargetFileName)
 set Provider="$(MyCompanyName)"
 set CatalogFile=driver-$(MyProductFileArch).cat
+if "$(MyProductFileArch)"=="a64" set ArchDecoration=ntarm64
+if "$(MyProductFileArch)"=="x64" set ArchDecoration=ntamd64
+if "$(MyProductFileArch)"=="x86" set ArchDecoration=ntx86
 
 setlocal EnableDelayedExpansion
 if exist $(OutDir)driver-$(MyProductFileArch).inf del $(OutDir)driver-$(MyProductFileArch).inf
@@ -303,6 +307,9 @@ stampinf -d * -v $(MyVersion) -f $(OutDir)driver-$(MyProductFileArch).inf</Comma
       <Command Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">set DriverFile=$(TargetFileName)
 set Provider="$(MyCompanyName)"
 set CatalogFile=driver-$(MyProductFileArch).cat
+if "$(MyProductFileArch)"=="a64" set ArchDecoration=ntarm64
+if "$(MyProductFileArch)"=="x64" set ArchDecoration=ntamd64
+if "$(MyProductFileArch)"=="x86" set ArchDecoration=ntx86
 
 setlocal EnableDelayedExpansion
 if exist $(OutDir)driver-$(MyProductFileArch).inf del $(OutDir)driver-$(MyProductFileArch).inf
@@ -316,6 +323,9 @@ stampinf -d * -v $(MyVersion) -f $(OutDir)driver-$(MyProductFileArch).inf</Comma
       <Command Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">set DriverFile=$(TargetFileName)
 set Provider="$(MyCompanyName)"
 set CatalogFile=driver-$(MyProductFileArch).cat
+if "$(MyProductFileArch)"=="a64" set ArchDecoration=ntarm64
+if "$(MyProductFileArch)"=="x64" set ArchDecoration=ntamd64
+if "$(MyProductFileArch)"=="x86" set ArchDecoration=ntx86
 
 setlocal EnableDelayedExpansion
 if exist $(OutDir)driver-$(MyProductFileArch).inf del $(OutDir)driver-$(MyProductFileArch).inf
@@ -328,6 +338,9 @@ stampinf -d * -v $(MyVersion) -f $(OutDir)driver-$(MyProductFileArch).inf</Comma
       <Command Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">set DriverFile=$(TargetFileName)
 set Provider="$(MyCompanyName)"
 set CatalogFile=driver-$(MyProductFileArch).cat
+if "$(MyProductFileArch)"=="a64" set ArchDecoration=ntarm64
+if "$(MyProductFileArch)"=="x64" set ArchDecoration=ntamd64
+if "$(MyProductFileArch)"=="x86" set ArchDecoration=ntx86
 
 setlocal EnableDelayedExpansion
 if exist $(OutDir)driver-$(MyProductFileArch).inf del $(OutDir)driver-$(MyProductFileArch).inf
@@ -342,6 +355,9 @@ stampinf -d * -v $(MyVersion) -f $(OutDir)driver-$(MyProductFileArch).inf</Comma
       <Command Condition="'$(Configuration)|$(Platform)'=='Release|x64'">set DriverFile=$(TargetFileName)
 set Provider="$(MyCompanyName)"
 set CatalogFile=driver-$(MyProductFileArch).cat
+if "$(MyProductFileArch)"=="a64" set ArchDecoration=ntarm64
+if "$(MyProductFileArch)"=="x64" set ArchDecoration=ntamd64
+if "$(MyProductFileArch)"=="x86" set ArchDecoration=ntx86
 
 setlocal EnableDelayedExpansion
 if exist $(OutDir)driver-$(MyProductFileArch).inf del $(OutDir)driver-$(MyProductFileArch).inf
@@ -354,6 +370,9 @@ stampinf -d * -v $(MyVersion) -f $(OutDir)driver-$(MyProductFileArch).inf</Comma
       <Command Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">set DriverFile=$(TargetFileName)
 set Provider="$(MyCompanyName)"
 set CatalogFile=driver-$(MyProductFileArch).cat
+if "$(MyProductFileArch)"=="a64" set ArchDecoration=ntarm64
+if "$(MyProductFileArch)"=="x64" set ArchDecoration=ntamd64
+if "$(MyProductFileArch)"=="x86" set ArchDecoration=ntx86
 
 setlocal EnableDelayedExpansion
 if exist $(OutDir)driver-$(MyProductFileArch).inf del $(OutDir)driver-$(MyProductFileArch).inf

build/VStudio/winfsp_sys.vcxproj.filters

@@ -134,6 +134,9 @@
     <ClCompile Include="..\..\src\shared\ku\mountmgr.c">
       <Filter>Source\shared\ku</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\sys\sxs.c">
+      <Filter>Source</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\src\sys\driver.h">

inc/winfsp/fsctl.h

@@ -111,6 +111,8 @@ extern const __declspec(selectany) GUID FspFsvrtDeviceClassGuid =
     CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 0x800 + 's', METHOD_BUFFERED, FILE_ANY_ACCESS)
 #define FSP_FSCTL_NOTIFY                \
     CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 0x800 + 'n', METHOD_NEITHER, FILE_ANY_ACCESS)
+#define FSP_FSCTL_UNLOAD                \
+    CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 0x800 + 'U', METHOD_NEITHER, FILE_ANY_ACCESS)
 
 /* fsctl internal device codes (usable only in-kernel) */
 #define FSP_FSCTL_TRANSACT_INTERNAL     \
@@ -694,6 +696,11 @@ FSP_API NTSTATUS FspFsctlNotify(HANDLE VolumeHandle,
 FSP_API NTSTATUS FspFsctlGetVolumeList(PWSTR DevicePath,
     PWCHAR VolumeListBuf, PSIZE_T PVolumeListSize);
 FSP_API NTSTATUS FspFsctlPreflight(PWSTR DevicePath);
+FSP_API NTSTATUS FspFsctlStartService(VOID);
+FSP_API NTSTATUS FspFsctlStopService(VOID);
+FSP_API NTSTATUS FspFsctlEnumServices(
+    VOID (*EnumFn)(PVOID Context, PWSTR ServiceName, BOOLEAN Running),
+    PVOID Context);
 
 typedef struct
 {

inc/winfsp/winfsp.h

@@ -1047,11 +1047,49 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
 
     NTSTATUS (*Obsolete0)(VOID);
 
+    /**
+     * Inform the file system that its dispatcher has been stopped.
+     *
+     * Prior to WinFsp v2.0 the FSD would never unmount a file system volume unless
+     * the user mode file system requested the unmount. Since WinFsp v2.0 it is possible
+     * for the FSD to unmount a file system volume without an explicit user mode file system
+     * request. For example, this happens when the FSD is being uninstalled.
+     *
+     * A user mode file system can use this operation to determine when its dispatcher
+     * has been stopped. The Normally parameter can be used to determine why the dispatcher
+     * was stopped: it is TRUE when the file system is being stopped via
+     * FspFileSystemStopDispatcher and FALSE otherwise.
+     *
+     * When the file system receives a request with Normally == TRUE it need not take any
+     * extra steps. This case is the same as for pre-v2.0 versions: since the file system
+     * stopped the dispatcher via FspFileSystemStopDispatcher, it will likely exit its
+     * process soon.
+     *
+     * When the file system receives a request with Normally == FALSE it may need to take
+     * extra steps to exit its process as this is not done by default.
+     *
+     * A file system that uses the FspService infrastructure may use the
+     * FspFileSystemStopServiceIfNecessary API to correctly handle all cases.
+     *
+     * This operation is the last one that a file system will receive.
+     *
+     * @param FileSystem
+     *     The file system on which this request is posted.
+     * @param Normally
+     *     TRUE if the file system is being stopped via FspFileSystemStopDispatcher.
+     *     FALSE if the file system is being stopped because of another reason such
+     *     as driver unload/uninstall.
+     * @see
+     *     FspFileSystemStopServiceIfNecessary
+     */
+    VOID (*DispatcherStopped)(FSP_FILE_SYSTEM *FileSystem,
+        BOOLEAN Normally);
+
     /*
      * This ensures that this interface will always contain 64 function pointers.
      * Please update when changing the interface as it is important for future compatibility.
      */
-    NTSTATUS (*Reserved[32])();
+    NTSTATUS (*Reserved[31])();
 } FSP_FILE_SYSTEM_INTERFACE;
 FSP_FSCTL_STATIC_ASSERT(sizeof(FSP_FILE_SYSTEM_INTERFACE) == 64 * sizeof(NTSTATUS (*)()),
     "FSP_FILE_SYSTEM_INTERFACE must have 64 entries.");
@@ -1074,7 +1112,8 @@ typedef struct _FSP_FILE_SYSTEM
     SRWLOCK OpGuardLock;
     BOOLEAN UmFileContextIsUserContext2, UmFileContextIsFullContext;
     UINT16 UmNoReparsePointsDirCheck:1;
-    UINT16 UmReservedFlags:15;
+    UINT16 UmReservedFlags:14;
+    UINT16 DispatcherStopping:1;
 } FSP_FILE_SYSTEM;
 FSP_FSCTL_STATIC_ASSERT(
     (4 == sizeof(PVOID) && 660 == sizeof(FSP_FILE_SYSTEM)) ||
@@ -1108,7 +1147,7 @@ FSP_API NTSTATUS FspFileSystemPreflight(PWSTR DevicePath,
  * @param VolumeParams
  *     Volume parameters for the newly created file system.
  * @param Interface
- *     A pointer to the actual operations that actually implement this user mode file system.
+ *     A pointer to the operations that implement this user mode file system.
  * @param PFileSystem [out]
  *     Pointer that will receive the file system object created on successful return from this
  *     call.
@@ -1746,6 +1785,23 @@ UINT32 FspFileSystemGetEaPackedSize(PFILE_FULL_EA_INFORMATION SingleEa)
  */
 FSP_API BOOLEAN FspFileSystemAddNotifyInfo(FSP_FSCTL_NOTIFY_INFO *NotifyInfo,
     PVOID Buffer, ULONG Length, PULONG PBytesTransferred);
+/**
+ * Stop a file system service, if any.
+ *
+ * This is a helper for implementing the DispatcherStopped operation, but only for file systems
+ * that use the FspService infrastructure.
+ *
+ * @param FileSystem
+ *     The file system object.
+ * @param Normally
+ *     TRUE if the file system is being stopped via FspFileSystemStopDispatcher.
+ *     FALSE if the file system is being stopped because of another reason such
+ *     as driver unload/uninstall.
+ * @see
+ *     DispatcherStopped
+ */
+FSP_API VOID FspFileSystemStopServiceIfNecessary(FSP_FILE_SYSTEM *FileSystem,
+    BOOLEAN Normally);
 
 /*
  * Directory buffering
@@ -2043,6 +2099,8 @@ FSP_API ULONG FspServiceGetExitCode(FSP_SERVICE *Service);
  * to connect the service process to the Service Control Manager. If the Service Control Manager is
  * not available (and console mode is allowed) it will enter console mode.
  *
+ * This function should be called once per process.
+ *
  * @param Service
  *     The service object.
  * @return
@@ -2120,6 +2178,7 @@ FSP_API NTSTATUS FspCallNamedPipeSecurelyEx(PWSTR PipeName,
     PULONG PBytesTransferred, ULONG Timeout, BOOLEAN AllowImpersonation,
     PSID Sid);
 FSP_API NTSTATUS FspVersion(PUINT32 PVersion);
+FSP_API PWSTR FspSxsIdent(VOID);
 
 /*
  * Delay load

src/dll/fs.c

@@ -358,6 +358,21 @@ exit:
         CloseHandle(DispatcherThread);
     }
 
+    if (GetCurrentThreadId() == GetThreadId(FileSystem->DispatcherThread))
+    {
+        if (0 != FileSystem->Interface->DispatcherStopped)
+        {
+            /* Normally = !!FileSystem->DispatcherStopping */
+            BOOLEAN Normally = !!(
+                _InterlockedOr16(
+                    (PVOID)((PUINT8)&FileSystem->UmFileContextIsFullContext +
+                        sizeof(FileSystem->UmFileContextIsFullContext)),
+                    0) &
+                0x8000);
+            FileSystem->Interface->DispatcherStopped(FileSystem, Normally);
+        }
+    }
+
     return Result;
 }
 
@@ -391,6 +406,11 @@ FSP_API NTSTATUS FspFileSystemStartDispatcher(FSP_FILE_SYSTEM *FileSystem, ULONG
     if (0 == FileSystem->DispatcherThread)
         return FspNtStatusFromWin32(GetLastError());
 
+#if defined(FSP_CFG_REJECT_EARLY_IRP)
+    FspFsctlTransact(FileSystem->VolumeHandle, 0, 0, 0, 0, FALSE);
+        /* send a Transact0 to inform the FSD that the dispatcher is _almost_ ready */
+#endif
+
     return STATUS_SUCCESS;
 }
 
@@ -399,6 +419,12 @@ FSP_API VOID FspFileSystemStopDispatcher(FSP_FILE_SYSTEM *FileSystem)
     if (0 == FileSystem->DispatcherThread)
         return;
 
+    /* FileSystem->DispatcherStopping = 1 */
+    _InterlockedOr16(
+        (PVOID)((PUINT8)&FileSystem->UmFileContextIsFullContext +
+            sizeof(FileSystem->UmFileContextIsFullContext)),
+        0x8000);
+
     FspFsctlStop0(FileSystem->VolumeHandle);
 
     WaitForSingleObject(FileSystem->DispatcherThread, INFINITE);
@@ -406,6 +432,12 @@ FSP_API VOID FspFileSystemStopDispatcher(FSP_FILE_SYSTEM *FileSystem)
     FileSystem->DispatcherThread = 0;
 
     FspFsctlStop(FileSystem->VolumeHandle);
+
+    /* FileSystem->DispatcherStopping = 0 */
+    _InterlockedAnd16(
+        (PVOID)((PUINT8)&FileSystem->UmFileContextIsFullContext +
+            sizeof(FileSystem->UmFileContextIsFullContext)),
+        0x7fff);
 }
 
 FSP_API VOID FspFileSystemSendResponse(FSP_FILE_SYSTEM *FileSystem,

src/dll/fsctl.c

@@ -32,19 +32,21 @@ static DWORD FspFsctlTransactCode = FSP_FSCTL_TRANSACT;
 static DWORD FspFsctlTransactBatchCode = FSP_FSCTL_TRANSACT_BATCH;
 
 static VOID FspFsctlServiceVersion(PUINT32 PVersion);
-static NTSTATUS FspFsctlStartService(VOID);
 
 FSP_API NTSTATUS FspFsctlCreateVolume(PWSTR DevicePath,
     const FSP_FSCTL_VOLUME_PARAMS *VolumeParams,
     PWCHAR VolumeNameBuf, SIZE_T VolumeNameSize,
     PHANDLE PVolumeHandle)
 {
-    NTSTATUS Result;
+    WCHAR SxsDevicePathBuf[MAX_PATH];
     PWSTR DeviceRoot;
     SIZE_T DeviceRootSize, DevicePathSize, VolumeParamsSize;
     WCHAR DevicePathBuf[MAX_PATH + sizeof *VolumeParams], *DevicePathPtr, *DevicePathEnd;
     HANDLE VolumeHandle = INVALID_HANDLE_VALUE;
     DWORD Bytes;
+    NTSTATUS Result;
+
+    DevicePath = FspSxsAppendSuffix(SxsDevicePathBuf, sizeof SxsDevicePathBuf, DevicePath);
 
     if (sizeof(WCHAR) <= VolumeNameSize)
         VolumeNameBuf[0] = L'\0';
@@ -229,12 +231,15 @@ exit:
 FSP_API NTSTATUS FspFsctlGetVolumeList(PWSTR DevicePath,
     PWCHAR VolumeListBuf, PSIZE_T PVolumeListSize)
 {
-    NTSTATUS Result;
+    WCHAR SxsDevicePathBuf[MAX_PATH];
     PWSTR DeviceRoot;
     SIZE_T DeviceRootSize, DevicePathSize;
     WCHAR DevicePathBuf[MAX_PATH], *DevicePathPtr;
     HANDLE VolumeHandle = INVALID_HANDLE_VALUE;
     DWORD Bytes;
+    NTSTATUS Result;
+
+    DevicePath = FspSxsAppendSuffix(SxsDevicePathBuf, sizeof SxsDevicePathBuf, DevicePath);
 
     /* check lengths; everything must fit within MAX_PATH */
     DeviceRoot = L'\\' == DevicePath[0] ? GLOBALROOT : GLOBALROOT "\\Device\\";
@@ -298,16 +303,71 @@ FSP_API NTSTATUS FspFsctlPreflight(PWSTR DevicePath)
     return STATUS_SUCCESS;
 }
 
+static NTSTATUS FspFsctlUnload(PWSTR DevicePath)
+{
+    WCHAR SxsDevicePathBuf[MAX_PATH];
+    PWSTR DeviceRoot;
+    SIZE_T DeviceRootSize, DevicePathSize;
+    WCHAR DevicePathBuf[MAX_PATH], *DevicePathPtr;
+    HANDLE VolumeHandle = INVALID_HANDLE_VALUE;
+    DWORD Bytes;
+    NTSTATUS Result;
+
+    DevicePath = FspSxsAppendSuffix(SxsDevicePathBuf, sizeof SxsDevicePathBuf, DevicePath);
+
+    /* check lengths; everything must fit within MAX_PATH */
+    DeviceRoot = L'\\' == DevicePath[0] ? GLOBALROOT : GLOBALROOT "\\Device\\";
+    DeviceRootSize = lstrlenW(DeviceRoot) * sizeof(WCHAR);
+    DevicePathSize = lstrlenW(DevicePath) * sizeof(WCHAR);
+    if (DeviceRootSize + DevicePathSize + sizeof(WCHAR) > sizeof DevicePathBuf)
+        return STATUS_INVALID_PARAMETER;
+
+    /* prepare the device path to be opened */
+    DevicePathPtr = DevicePathBuf;
+    memcpy(DevicePathPtr, DeviceRoot, DeviceRootSize);
+    DevicePathPtr = (PVOID)((PUINT8)DevicePathPtr + DeviceRootSize);
+    memcpy(DevicePathPtr, DevicePath, DevicePathSize);
+    DevicePathPtr = (PVOID)((PUINT8)DevicePathPtr + DevicePathSize);
+    *DevicePathPtr = L'\0';
+
+    VolumeHandle = CreateFileW(DevicePathBuf,
+        0, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
+    if (INVALID_HANDLE_VALUE == VolumeHandle)
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        if (STATUS_OBJECT_PATH_NOT_FOUND == Result ||
+            STATUS_OBJECT_NAME_NOT_FOUND == Result)
+            Result = STATUS_NO_SUCH_DEVICE;
+        goto exit;
+    }
+
+    if (!DeviceIoControl(VolumeHandle, FSP_FSCTL_UNLOAD, 0, 0, 0, 0, &Bytes, 0))
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        goto exit;
+    }
+
+    Result = STATUS_SUCCESS;
+
+exit:
+    if (INVALID_HANDLE_VALUE != VolumeHandle)
+        CloseHandle(VolumeHandle);
+
+    return Result;
+}
+
 static BOOL WINAPI FspFsctlServiceVersionInitialize(
     PINIT_ONCE InitOnce, PVOID Parameter, PVOID *Context)
 {
-    PWSTR DriverName = L"" FSP_FSCTL_DRIVER_NAME;
+    WCHAR DriverName[256];
     PWSTR ModuleFileName;
     SC_HANDLE ScmHandle = 0;
     SC_HANDLE SvcHandle = 0;
     QUERY_SERVICE_CONFIGW *ServiceConfig = 0;
     DWORD Size;
 
+    FspSxsAppendSuffix(DriverName, sizeof DriverName, L"" FSP_FSCTL_DRIVER_NAME);
+
     ScmHandle = OpenSCManagerW(0, 0, 0);
     if (0 == ScmHandle)
         goto exit;
@@ -371,29 +431,33 @@ static VOID FspFsctlServiceVersion(PUINT32 PVersion)
         *PVersion = FspFsctlServiceVersionValue;
 }
 
-static NTSTATUS FspFsctlStartService(VOID)
+static SRWLOCK FspFsctlStartStopServiceLock = SRWLOCK_INIT;
+
+static BOOLEAN FspFsctlRunningInContainer(VOID)
+{
+    /* Determine if we are running inside container.
+     *
+     * See https://github.com/microsoft/perfview/blob/V1.9.65/src/TraceEvent/TraceEventSession.cs#L525
+     * See https://stackoverflow.com/a/50748300
+     */
+    return ERROR_SUCCESS == RegGetValueW(
+        HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Control",
+        L"ContainerType",
+        RRF_RT_REG_DWORD, 0,
+        0, 0);
+}
+
+static NTSTATUS FspFsctlStartServiceByName(PWSTR DriverName)
 {
-    static SRWLOCK Lock = SRWLOCK_INIT;
-    PWSTR DriverName = L"" FSP_FSCTL_DRIVER_NAME;
     SC_HANDLE ScmHandle = 0;
     SC_HANDLE SvcHandle = 0;
     SERVICE_STATUS ServiceStatus;
     DWORD LastError;
     NTSTATUS Result;
 
-    AcquireSRWLockExclusive(&Lock);
+    AcquireSRWLockExclusive(&FspFsctlStartStopServiceLock);
 
-    /* Determine if we are running inside container.
-     *
-     * See https://github.com/microsoft/perfview/blob/V1.9.65/src/TraceEvent/TraceEventSession.cs#L525
-     * See https://stackoverflow.com/a/50748300
-     */
-    LastError = RegGetValueW(
-        HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Control",
-        L"ContainerType",
-        RRF_RT_REG_DWORD, 0,
-        0, 0);
-    if (ERROR_SUCCESS == LastError)
+    if (FspFsctlRunningInContainer())
     {
         Result = STATUS_SUCCESS;
         goto exit;
@@ -453,7 +517,218 @@ exit:
     if (0 != ScmHandle)
         CloseServiceHandle(ScmHandle);
 
-    ReleaseSRWLockExclusive(&Lock);
+    ReleaseSRWLockExclusive(&FspFsctlStartStopServiceLock);
+
+    return Result;
+}
+
+static VOID FspFsctlStartService_EnumFn(PVOID Context, PWSTR ServiceName, BOOLEAN Running)
+{
+    PWSTR DriverName = Context;
+    if (0 > invariant_wcscmp(DriverName, ServiceName))
+        lstrcpyW(DriverName, ServiceName);
+}
+
+FSP_API NTSTATUS FspFsctlStartService(VOID)
+{
+    /*
+     * With the introduction of side-by-side (SxS) FSD installations,
+     * we revisit how the FSD is started:
+     *
+     * - If the DLL is started in non-SxS mode, we first try to start
+     * the non-SxS FSD. If that fails we then enumerate all SxS FSD's
+     * and make a best guess on which one to start.
+     *
+     * - If the DLL is started in SxS mode, we only attempt to start
+     * the associated SxS FSD.
+     */
+
+    if (L'\0' == FspSxsIdent()[0])
+    {
+        /* non-SxS mode */
+
+        NTSTATUS Result;
+        WCHAR DriverName[256];
+
+        Result = FspFsctlStartServiceByName(L"" FSP_FSCTL_DRIVER_NAME);
+        if (NT_SUCCESS(Result) || STATUS_NO_SUCH_DEVICE != Result)
+            return Result;
+
+        /* DO NOT CLOBBER Result. We will return it if our best effort below fails. */
+
+        DriverName[0] = L'\0';
+        FspFsctlEnumServices(FspFsctlStartService_EnumFn, DriverName);
+
+        if (L'\0' == DriverName[0] || !NT_SUCCESS(FspFsctlStartServiceByName(DriverName)))
+            return Result;
+
+        return STATUS_SUCCESS;
+    }
+    else
+    {
+        /* SxS mode */
+
+        WCHAR DriverName[256];
+        FspSxsAppendSuffix(DriverName, sizeof DriverName, L"" FSP_FSCTL_DRIVER_NAME);
+        return FspFsctlStartServiceByName(DriverName);
+    }
+}
+
+FSP_API NTSTATUS FspFsctlStopService(VOID)
+{
+    WCHAR DriverName[256];
+    HANDLE ThreadToken = 0, ProcessToken = 0;
+    BOOL DidSetThreadToken = FALSE, DidAdjustTokenPrivileges = FALSE;
+    TOKEN_PRIVILEGES Privileges, PreviousPrivileges;
+    PRIVILEGE_SET RequiredPrivileges;
+    DWORD PreviousPrivilegesLength;
+    BOOL PrivilegeCheckResult;
+    NTSTATUS Result;
+
+    FspSxsAppendSuffix(DriverName, sizeof DriverName, L"" FSP_FSCTL_DRIVER_NAME);
+
+    AcquireSRWLockExclusive(&FspFsctlStartStopServiceLock);
+
+    if (FspFsctlRunningInContainer())
+    {
+        Result = STATUS_SUCCESS;
+        goto exit;
+    }
+
+    /* enable and check SeLoadDriverPrivilege required for FSP_FSCTL_UNLOAD */
+    if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, TRUE, &ThreadToken))
+    {
+        if (!OpenProcessToken(GetCurrentProcess(), MAXIMUM_ALLOWED, &ProcessToken) ||
+            !DuplicateToken(ProcessToken, SecurityDelegation, &ThreadToken) ||
+            !SetThreadToken(0, ThreadToken))
+        {
+            Result = FspNtStatusFromWin32(GetLastError());
+            goto exit;
+        }
+        DidSetThreadToken = TRUE;
+        CloseHandle(ThreadToken);
+        ThreadToken = 0;
+        if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, TRUE, &ThreadToken))
+        {
+            Result = FspNtStatusFromWin32(GetLastError());
+            goto exit;
+        }
+    }
+    if (!LookupPrivilegeValueW(0, SE_LOAD_DRIVER_NAME, &Privileges.Privileges[0].Luid))
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        goto exit;
+    }
+    Privileges.PrivilegeCount = 1;
+    Privileges.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
+    if (!AdjustTokenPrivileges(ThreadToken, FALSE,
+        &Privileges, sizeof PreviousPrivileges, &PreviousPrivileges, &PreviousPrivilegesLength))
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        goto exit;
+    }
+    DidAdjustTokenPrivileges = 0 == GetLastError();
+    RequiredPrivileges.PrivilegeCount = 1;
+    RequiredPrivileges.Control = PRIVILEGE_SET_ALL_NECESSARY;
+    RequiredPrivileges.Privilege[0].Attributes = 0;
+    RequiredPrivileges.Privilege[0].Luid = Privileges.Privileges[0].Luid;
+    if (!PrivilegeCheck(ThreadToken, &RequiredPrivileges, &PrivilegeCheckResult))
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        goto exit;
+    }
+    if (!PrivilegeCheckResult)
+    {
+        Result = STATUS_PRIVILEGE_NOT_HELD;
+        goto exit;
+    }
+
+    Result = FspFsctlUnload(L"" FSP_FSCTL_DISK_DEVICE_NAME);
+    if (!NT_SUCCESS(Result) && STATUS_NO_SUCH_DEVICE != Result)
+        goto exit;
+
+    Result = STATUS_SUCCESS;
+
+exit:
+    if (DidAdjustTokenPrivileges)
+        AdjustTokenPrivileges(ThreadToken, FALSE, &PreviousPrivileges, 0, 0, 0);
+    if (DidSetThreadToken)
+        SetThreadToken(0, 0);
+    if (0 != ThreadToken)
+        CloseHandle(ThreadToken);
+    if (0 != ProcessToken)
+        CloseHandle(ProcessToken);
+
+    ReleaseSRWLockExclusive(&FspFsctlStartStopServiceLock);
+
+    return Result;
+}
+
+FSP_API NTSTATUS FspFsctlEnumServices(
+    VOID (*EnumFn)(PVOID Context, PWSTR ServiceName, BOOLEAN Running),
+    PVOID Context)
+{
+    SC_HANDLE ScmHandle = 0;
+    LPENUM_SERVICE_STATUSW Services = 0;
+    DWORD Size, ServiceCount;
+    DWORD LastError;
+    NTSTATUS Result;
+
+    ScmHandle = OpenSCManagerW(0, 0, SC_MANAGER_ENUMERATE_SERVICE);
+    if (0 == ScmHandle)
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        goto exit;
+    }
+
+    if (!EnumServicesStatusW(ScmHandle,
+        SERVICE_FILE_SYSTEM_DRIVER, SERVICE_STATE_ALL, 0, 0, &Size, &ServiceCount, 0))
+    {
+        LastError = GetLastError();
+        if (ERROR_MORE_DATA != LastError)
+        {
+            Result = FspNtStatusFromWin32(LastError);
+            goto exit;
+        }
+    }
+    if (0 == Size)
+    {
+        Result = STATUS_SUCCESS;
+        goto exit;
+    }
+
+    Services = MemAlloc(Size);
+    if (0 == Services)
+    {
+        Result = STATUS_INSUFFICIENT_RESOURCES;
+        goto exit;
+    }
+
+    if (!EnumServicesStatusW(ScmHandle,
+        SERVICE_FILE_SYSTEM_DRIVER, SERVICE_STATE_ALL, Services, Size, &Size, &ServiceCount, 0))
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        goto exit;
+    }
+
+    for (DWORD I = 0; ServiceCount > I; I++)
+    {
+        if (0 != invariant_wcsicmp(Services[I].lpServiceName, L"" FSP_FSCTL_DRIVER_NAME) &&
+            0 != invariant_wcsnicmp(Services[I].lpServiceName,
+            L"" FSP_FSCTL_DRIVER_NAME FSP_SXS_SEPARATOR_STRING,
+            sizeof(FSP_FSCTL_DRIVER_NAME FSP_SXS_SEPARATOR_STRING) - 1))
+            continue;
+        EnumFn(Context,
+            Services[I].lpServiceName,
+            SERVICE_STOPPED != Services[I].ServiceStatus.dwCurrentState);
+    }
+
+    Result = STATUS_SUCCESS;
+
+exit:
+    MemFree(Services);
+    if (0 != ScmHandle)
+        CloseServiceHandle(ScmHandle);
 
     return Result;
 }
@@ -461,14 +736,15 @@ exit:
 static NTSTATUS FspFsctlFixServiceSecurity(HANDLE SvcHandle)
 {
     /*
-     * This function adds an ACE that allows Everyone to start a service.
+     * This function adds two ACE's:
+     * - An ACE that allows Everyone to start a service.
+     * - An ACE that denies Everyone (including Administrators) to stop a service.
      */
 
     PSID WorldSid;
     PSECURITY_DESCRIPTOR SecurityDescriptor = 0;
     PSECURITY_DESCRIPTOR NewSecurityDescriptor = 0;
-    EXPLICIT_ACCESSW AccessEntry;
-    ACCESS_MASK AccessRights;
+    EXPLICIT_ACCESSW AccessEntries[2];
     PACL Dacl;
     BOOL DaclPresent, DaclDefaulted;
     DWORD Size;
@@ -513,41 +789,28 @@ static NTSTATUS FspFsctlFixServiceSecurity(HANDLE SvcHandle)
         goto exit;
     }
 
-    /* prepare an EXPLICIT_ACCESS for the SERVICE_QUERY_STATUS | SERVICE_START right for Everyone */
-    AccessEntry.grfAccessPermissions = SERVICE_QUERY_STATUS | SERVICE_START;
-    AccessEntry.grfAccessMode = GRANT_ACCESS;
-    AccessEntry.grfInheritance = NO_INHERITANCE;
-    AccessEntry.Trustee.pMultipleTrustee = 0;
-    AccessEntry.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
-    AccessEntry.Trustee.TrusteeForm = TRUSTEE_IS_SID;
-    AccessEntry.Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
-    AccessEntry.Trustee.ptstrName = WorldSid;
+    /* prepare an EXPLICIT_ACCESS for the SERVICE_QUERY_STATUS | SERVICE_START rights for Everyone */
+    AccessEntries[0].grfAccessPermissions = SERVICE_QUERY_STATUS | SERVICE_START;
+    AccessEntries[0].grfAccessMode = GRANT_ACCESS;
+    AccessEntries[0].grfInheritance = NO_INHERITANCE;
+    AccessEntries[0].Trustee.pMultipleTrustee = 0;
+    AccessEntries[0].Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
+    AccessEntries[0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
+    AccessEntries[0].Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
+    AccessEntries[0].Trustee.ptstrName = WorldSid;
 
-    /* get the effective rights for Everyone */
-    AccessRights = 0;
-    if (DaclPresent && 0 != Dacl)
-    {
-        LastError = GetEffectiveRightsFromAclW(Dacl, &AccessEntry.Trustee, &AccessRights);
-        if (0 != LastError)
-            /*
-             * Apparently GetEffectiveRightsFromAclW can fail with ERROR_CIRCULAR_DEPENDENCY
-             * in some rare circumstances. Calling GetEffectiveRightsFromAclW is not essential
-             * in this instance. It is only done to check whether the "Everyone/World" SID
-             * already has the access required to start the FSD; if it does not have those
-             * rights already they are added. It is probably safe to just assume that the
-             * required rights are not there if GetEffectiveRightsFromAclW fails; the worst
-             * that can happen is that the rights get added twice (which is benign).
-             *
-             * See https://github.com/winfsp/winfsp/issues/62
-             */
-            AccessRights = 0;
-    }
+    /* prepare an EXPLICIT_ACCESS to deny the SERVICE_STOP right to Everyone */
+    AccessEntries[1].grfAccessPermissions = SERVICE_STOP;
+    AccessEntries[1].grfAccessMode = DENY_ACCESS;
+    AccessEntries[1].grfInheritance = NO_INHERITANCE;
+    AccessEntries[1].Trustee.pMultipleTrustee = 0;
+    AccessEntries[1].Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
+    AccessEntries[1].Trustee.TrusteeForm = TRUSTEE_IS_SID;
+    AccessEntries[1].Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
+    AccessEntries[1].Trustee.ptstrName = WorldSid;
 
-    /* do we have the required access rights? */
-    if (AccessEntry.grfAccessPermissions != (AccessRights & AccessEntry.grfAccessPermissions))
-    {
     /* create a new security descriptor with the new access */
-        LastError = BuildSecurityDescriptorW(0, 0, 1, &AccessEntry, 0, 0, SecurityDescriptor,
+    LastError = BuildSecurityDescriptorW(0, 0, 2, AccessEntries, 0, 0, SecurityDescriptor,
         &Size, &NewSecurityDescriptor);
     if (0 != LastError)
     {
@@ -561,7 +824,6 @@ static NTSTATUS FspFsctlFixServiceSecurity(HANDLE SvcHandle)
         Result = FspNtStatusFromWin32(GetLastError());
         goto exit;
     }
-    }
 
     Result = STATUS_SUCCESS;
 
@@ -575,7 +837,7 @@ exit:
 NTSTATUS FspFsctlRegister(VOID)
 {
     extern HINSTANCE DllInstance;
-    PWSTR DriverName = L"" FSP_FSCTL_DRIVER_NAME;
+    WCHAR DriverName[256];
     WCHAR DriverPath[MAX_PATH];
     DWORD Size;
     SC_HANDLE ScmHandle = 0;
@@ -584,6 +846,8 @@ NTSTATUS FspFsctlRegister(VOID)
     SERVICE_DESCRIPTION ServiceDescription;
     NTSTATUS Result;
 
+    FspSxsAppendSuffix(DriverName, sizeof DriverName, L"" FSP_FSCTL_DRIVER_NAME);
+
     Result = FspGetModuleFileName(DllInstance, DriverPath, MAX_PATH, L"" MyFsctlRegisterPath);
     if (!NT_SUCCESS(Result))
         return Result;
@@ -674,12 +938,16 @@ exit:
 
 NTSTATUS FspFsctlUnregister(VOID)
 {
-    PWSTR DriverName = L"" FSP_FSCTL_DRIVER_NAME;
+    WCHAR DriverName[256];
     SC_HANDLE ScmHandle = 0;
     SC_HANDLE SvcHandle = 0;
     DWORD LastError;
     NTSTATUS Result;
 
+    FspSxsAppendSuffix(DriverName, sizeof DriverName, L"" FSP_FSCTL_DRIVER_NAME);
+
+    FspFsctlStopService();
+
     ScmHandle = OpenSCManagerW(0, 0, SC_MANAGER_CREATE_SERVICE);
         /*
          * The SC_MANAGER_CREATE_SERVICE access right is not strictly needed here,

src/dll/fsop.c

@@ -1883,3 +1883,12 @@ FSP_API BOOLEAN FspFileSystemAddNotifyInfo(FSP_FSCTL_NOTIFY_INFO *NotifyInfo,
 {
     return FspFileSystemAddXxxInfo(NotifyInfo, Buffer, Length, PBytesTransferred);
 }
+
+FSP_API VOID FspFileSystemStopServiceIfNecessary(FSP_FILE_SYSTEM *FileSystem,
+    BOOLEAN Normally)
+{
+    /* NOTE: .NET calls us with a zero FileSystem pointer! */
+    if (Normally)
+        return;
+    FspServiceStopLoop();
+}

src/dll/fuse/fuse_intf.c

@@ -1939,7 +1939,7 @@ int fsp_fuse_intf_AddDirInfo(void *buf, const char *name,
     }
 
     SizeA = lstrlenA(name);
-    if (SizeA > 255)
+    if (SizeA > 255 * 4)
     {
         fsp_fuse_intf_LogBadDirInfo(filedesc->PosixPath, name,
             "too long");
@@ -1949,6 +1949,13 @@ int fsp_fuse_intf_AddDirInfo(void *buf, const char *name,
     SizeW = MultiByteToWideChar(CP_UTF8, 0, name, SizeA, DirInfo->FileNameBuf, 255);
     if (0 == SizeW)
     {
+        if (ERROR_INSUFFICIENT_BUFFER == GetLastError())
+        {
+            fsp_fuse_intf_LogBadDirInfo(filedesc->PosixPath, name,
+                "too long");
+            return 0;
+        }
+
         fsp_fuse_intf_LogBadDirInfo(filedesc->PosixPath, name,
             "MultiByteToWideChar failed");
         return 0;
@@ -1991,7 +1998,7 @@ static NTSTATUS fsp_fuse_intf_FixDirInfo(FSP_FILE_SYSTEM *FileSystem,
     NTSTATUS Result;
 
     SizeA = lstrlenA(filedesc->PosixPath);
-    PosixPath = MemAlloc(SizeA + 1 + 255 + 1);
+    PosixPath = MemAlloc(SizeA + 1 + 255 * 4 + 1);
     if (0 == PosixPath)
     {
         Result = STATUS_INSUFFICIENT_RESOURCES;
@@ -2040,7 +2047,7 @@ static NTSTATUS fsp_fuse_intf_FixDirInfo(FSP_FILE_SYSTEM *FileSystem,
             else
             {
                 PosixPathEnd = 0;
-                SizeA = WideCharToMultiByte(CP_UTF8, 0, DirInfo->FileNameBuf, SizeW, PosixName, 255, 0, 0);
+                SizeA = WideCharToMultiByte(CP_UTF8, 0, DirInfo->FileNameBuf, SizeW, PosixName, 255 * 4, 0, 0);
                 if (0 == SizeA)
                 {
                     /* this should never happen because we just converted using MultiByteToWideChar */
@@ -2628,6 +2635,17 @@ static NTSTATUS fsp_fuse_intf_SetEa(FSP_FILE_SYSTEM *FileSystem,
         &Uid, &Gid, &Mode, FileInfo);
 }
 
+static VOID fsp_fuse_intf_DispatcherStopped(FSP_FILE_SYSTEM *FileSystem,
+    BOOLEAN Normally)
+{
+    if (Normally)
+        return;
+
+    struct fuse *f = FileSystem->UserContext;
+
+    fsp_fuse_exit(f->env, f);
+}
+
 FSP_FILE_SYSTEM_INTERFACE fsp_fuse_intf =
 {
     fsp_fuse_intf_GetVolumeInfo,
@@ -2661,6 +2679,8 @@ FSP_FILE_SYSTEM_INTERFACE fsp_fuse_intf =
     fsp_fuse_intf_Overwrite,
     fsp_fuse_intf_GetEa,
     fsp_fuse_intf_SetEa,
+    0,
+    fsp_fuse_intf_DispatcherStopped,
 };
 
 /*

src/dll/library.h

@@ -70,6 +70,9 @@ NTSTATUS FspNpUnregister(VOID);
 NTSTATUS FspEventLogRegister(VOID);
 NTSTATUS FspEventLogUnregister(VOID);
 
+PWSTR FspSxsSuffix(VOID);
+PWSTR FspSxsAppendSuffix(PWCHAR Buffer, SIZE_T Size, PWSTR Ident);
+
 PSID FspWksidNew(WELL_KNOWN_SID_TYPE WellKnownSidType, PNTSTATUS PResult);
 PSID FspWksidGet(WELL_KNOWN_SID_TYPE WellKnownSidType);
 
@@ -107,6 +110,7 @@ NTSTATUS FspGetModuleFileName(
 VOID FspFileSystemPeekInDirectoryBuffer(PVOID *PDirBuffer,
     PUINT8 *PBuffer, PULONG *PIndex, PULONG PCount);
 
+VOID FspServiceStopLoop(VOID);
 BOOL WINAPI FspServiceConsoleCtrlHandler(DWORD CtrlType);
 
 static inline ULONG FspPathSuffixIndex(PWSTR FileName)

src/dll/service.c

@@ -40,6 +40,8 @@ enum
     GetStatus_WaitHint                  = 0x4000,
 };
 
+static SRWLOCK FspServiceLoopLock = SRWLOCK_INIT;
+static SRWLOCK FspServiceTableLock = SRWLOCK_INIT;
 static SERVICE_TABLE_ENTRYW *FspServiceTable;
 static HANDLE FspServiceConsoleModeEvent;
 static UINT32 FspServiceConsoleCtrlHandlerDisabled;
@@ -220,6 +222,14 @@ FSP_API ULONG FspServiceGetExitCode(FSP_SERVICE *Service)
 
 FSP_API NTSTATUS FspServiceLoop(FSP_SERVICE *Service)
 {
+    /*
+     * FspServiceLoop can only be called once per process, because of StartServiceCtrlDispatcherW
+     * (which returns ERROR_SERVICE_ALREADY_RUNNING if called more than once). Unfortunately this
+     * limitation was never documented and there may be users of FspServiceLoop out there that call
+     * it more than once per process.
+     */
+    AcquireSRWLockExclusive(&FspServiceLoopLock);
+
     NTSTATUS Result;
     SERVICE_TABLE_ENTRYW ServiceTable[2];
 
@@ -236,7 +246,9 @@ FSP_API NTSTATUS FspServiceLoop(FSP_SERVICE *Service)
     ServiceTable[0].lpServiceProc = FspServiceEntry;
     ServiceTable[1].lpServiceName = 0;
     ServiceTable[1].lpServiceProc = 0;
+    AcquireSRWLockExclusive(&FspServiceTableLock);
     FspServiceTable = ServiceTable;
+    ReleaseSRWLockExclusive(&FspServiceTableLock);
 
     if (!StartServiceCtrlDispatcherW(ServiceTable))
     {
@@ -331,11 +343,42 @@ FSP_API NTSTATUS FspServiceLoop(FSP_SERVICE *Service)
     Result = STATUS_SUCCESS;
 
 exit:
+    AcquireSRWLockExclusive(&FspServiceTableLock);
     FspServiceTable = 0;
+    ReleaseSRWLockExclusive(&FspServiceTableLock);
+
+    ReleaseSRWLockExclusive(&FspServiceLoopLock);
 
     return Result;
 }
 
+static DWORD WINAPI FspServiceStopLoopThread(PVOID Context);
+VOID FspServiceStopLoop(VOID)
+{
+    BOOLEAN HasService;
+    HANDLE Thread;
+
+    AcquireSRWLockShared(&FspServiceTableLock);
+    HasService = 0 != FspServiceFromTable();
+    ReleaseSRWLockShared(&FspServiceTableLock);
+
+    if (HasService)
+    {
+        Thread = CreateThread(0, 0, FspServiceStopLoopThread, 0, 0, 0);
+        if (0 != Thread)
+            CloseHandle(Thread);
+    }
+}
+static DWORD WINAPI FspServiceStopLoopThread(PVOID Context)
+{
+    AcquireSRWLockShared(&FspServiceTableLock);
+    FSP_SERVICE *Service = FspServiceFromTable();
+    if (0 != Service)
+        FspServiceStop(Service);
+    ReleaseSRWLockShared(&FspServiceTableLock);
+    return 0;
+}
+
 FSP_API VOID FspServiceStop(FSP_SERVICE *Service)
 {
     SERVICE_STATUS ServiceStatus;
@@ -393,6 +436,7 @@ static VOID WINAPI FspServiceEntry(DWORD Argc, PWSTR *Argv)
     FSP_SERVICE *Service;
 
     Service = FspServiceFromTable();
+        /* we are subordinate to FspServiceLoop; no need to protect this access with FspServiceTableLock */
     if (0 == Service)
     {
         FspServiceLog(EVENTLOG_ERROR_TYPE,
@@ -501,6 +545,7 @@ static DWORD WINAPI FspServiceConsoleModeThread(PVOID Context)
         ;
 
     Service = FspServiceFromTable();
+        /* we are subordinate to FspServiceLoop; no need to protect this access with FspServiceTableLock */
     if (0 == Service)
         FspServiceLog(EVENTLOG_ERROR_TYPE,
             L"" __FUNCTION__ ": internal error: FspServiceFromTable = 0");

src/dll/sxs.c

@@ -0,0 +1,214 @@
+/**
+ * @file dll/sxs.c
+ *
+ * @copyright 2015-2022 Bill Zissimopoulos
+ */
+/*
+ * This file is part of WinFsp.
+ *
+ * You can redistribute it and/or modify it under the terms of the GNU
+ * General Public License version 3 as published by the Free Software
+ * Foundation.
+ *
+ * Licensees holding a valid commercial license may use this software
+ * in accordance with the commercial license agreement provided in
+ * conjunction with the software.  The terms and conditions of any such
+ * commercial license agreement shall govern, supersede, and render
+ * ineffective any application of the GPLv3 license to this software,
+ * notwithstanding of any reference thereto in the software or
+ * associated repository.
+ */
+
+#include <dll/library.h>
+
+static INIT_ONCE FspSxsIdentInitOnce = INIT_ONCE_STATIC_INIT;
+static WCHAR FspSxsIdentBuf[32 + 2] = L"";
+
+static BOOLEAN FspSxsIdentInitializeFromFile(VOID)
+{
+    extern HINSTANCE DllInstance;
+    WCHAR Path[MAX_PATH];
+    DWORD Size;
+    HANDLE Handle = INVALID_HANDLE_VALUE;
+    CHAR Buffer[ARRAYSIZE(FspSxsIdentBuf) - 2];
+    WCHAR WBuffer[ARRAYSIZE(FspSxsIdentBuf) - 2];
+    BOOLEAN Result = FALSE;
+
+    if (0 == GetModuleFileNameW(DllInstance, Path, MAX_PATH))
+        goto exit;
+
+    Size = lstrlenW(Path);
+    if (4 < Size &&
+        (L'.' == Path[Size - 4]) &&
+        (L'D' == Path[Size - 3] || L'd' == Path[Size - 3]) &&
+        (L'L' == Path[Size - 2] || L'l' == Path[Size - 2]) &&
+        (L'L' == Path[Size - 1] || L'l' == Path[Size - 1]) &&
+        (L'\0' == Path[Size]))
+        ;
+    else
+        goto exit;
+
+    Size -= 4;
+    for (PWCHAR P = Path + Size - 1; Path <= P; P--)
+    {
+        if (L'\\' == *P)
+            break;
+        if (L'-' == *P)
+        {
+            /* arch */
+            Size = (DWORD)(P - Path);
+            break;
+        }
+    }
+
+    Path[Size + 0] = L'.';
+    Path[Size + 1] = L's';
+    Path[Size + 2] = L'x';
+    Path[Size + 3] = L's';
+    Path[Size + 4] = L'\0';
+
+    Handle = CreateFileW(
+        Path,
+        FILE_READ_DATA,
+        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+        0,
+        OPEN_EXISTING,
+        0,
+        0);
+    if (INVALID_HANDLE_VALUE == Handle)
+        goto exit;
+
+    if (!ReadFile(Handle, Buffer, sizeof Buffer, &Size, 0))
+        goto exit;
+
+    for (PCHAR P = Buffer, EndP = P + Size; EndP > P; P++)
+        if ('\r' == *P || '\n' == *P)
+        {
+            Size = (DWORD)(P - Buffer);
+            break;
+        }
+
+    Size = MultiByteToWideChar(CP_UTF8, 0,
+        Buffer, Size, WBuffer, ARRAYSIZE(WBuffer));
+    if (0 == Size)
+        goto exit;
+
+    FspSxsIdentBuf[0] = FSP_SXS_SEPARATOR_CHAR;
+    memcpy(FspSxsIdentBuf + 1, WBuffer, Size * sizeof(WCHAR));
+    FspSxsIdentBuf[1 + Size] = L'\0';
+
+    Result = TRUE;
+
+exit:
+    if (INVALID_HANDLE_VALUE != Handle)
+        CloseHandle(Handle);
+
+    return Result;
+}
+
+static BOOLEAN FspSxsIdentInitializeFromDirectory(VOID)
+{
+    extern HINSTANCE DllInstance;
+    WCHAR Path[MAX_PATH];
+    HANDLE Handle = INVALID_HANDLE_VALUE;
+    WCHAR FinalPath[MAX_PATH];
+    PWCHAR P, EndP, Q, EndQ;
+    PWCHAR Ident = 0;
+    BOOLEAN Result = FALSE;
+
+    if (0 == GetModuleFileNameW(DllInstance, Path, MAX_PATH))
+        goto exit;
+
+    Handle = CreateFileW(
+        Path,
+        0,
+        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+        0,
+        OPEN_EXISTING,
+        0,
+        0);
+    if (INVALID_HANDLE_VALUE == Handle)
+        goto exit;
+
+    if (!GetFinalPathNameByHandleW(Handle, FinalPath, MAX_PATH, VOLUME_NAME_NONE))
+        goto exit;
+
+    EndP = FinalPath + lstrlenW(FinalPath);
+    for (P = EndP - 1; FinalPath <= P; P--)
+    {
+        if (L'\\' == *P &&
+            P + 9 < EndP &&
+            (L'S' == P[1] || L's' == P[1]) &&
+            (L'X' == P[2] || L'x' == P[2]) &&
+            (L'S' == P[3] || L's' == P[3]) &&
+            L'\\' == P[4] &&
+            (L'S' == P[5] || L's' == P[5]) &&
+            (L'X' == P[6] || L'x' == P[6]) &&
+            (L'S' == P[7] || L's' == P[7]) &&
+            L'.'  == P[8] &&
+            L'\\' != P[9])
+        {
+            Ident = P + 9;
+            break;
+        }
+    }
+    if (0 == Ident)
+        goto exit;
+
+    FspSxsIdentBuf[0] = FSP_SXS_SEPARATOR_CHAR;
+    EndQ = FspSxsIdentBuf + (ARRAYSIZE(FspSxsIdentBuf) - 1);
+    for (P = Ident, Q = FspSxsIdentBuf + 1; EndP > P && EndQ > Q && L'\\' != *P; P++, Q++)
+        *Q = *P;
+    *Q = L'\0';
+
+    Result = TRUE;
+
+exit:
+    if (INVALID_HANDLE_VALUE != Handle)
+        CloseHandle(Handle);
+
+    return Result;
+}
+
+static BOOL WINAPI FspSxsIdentInitialize(
+    PINIT_ONCE InitOnce, PVOID Parameter, PVOID *Context)
+{
+    if (FspSxsIdentInitializeFromFile())
+        goto exit;
+
+    if (FspSxsIdentInitializeFromDirectory())
+        goto exit;
+
+exit:
+    return TRUE;
+}
+
+FSP_API PWSTR FspSxsIdent(VOID)
+{
+    InitOnceExecuteOnce(&FspSxsIdentInitOnce, FspSxsIdentInitialize, 0, 0);
+    return FspSxsIdentBuf + 1;
+}
+
+PWSTR FspSxsSuffix(VOID)
+{
+    InitOnceExecuteOnce(&FspSxsIdentInitOnce, FspSxsIdentInitialize, 0, 0);
+    return FspSxsIdentBuf;
+}
+
+PWSTR FspSxsAppendSuffix(PWCHAR Buffer, SIZE_T Size, PWSTR Ident)
+{
+    PWSTR Suffix;
+    SIZE_T IdentSize, SuffixSize;
+
+    Suffix = FspSxsSuffix();
+    IdentSize = lstrlenW(Ident) * sizeof(WCHAR);
+    SuffixSize = lstrlenW(Suffix) * sizeof(WCHAR);
+    if (Size < IdentSize + SuffixSize + sizeof(WCHAR))
+        return L"<INVALID>";
+
+    memcpy(Buffer, Ident, IdentSize);
+    memcpy((PUINT8)Buffer + IdentSize, Suffix, SuffixSize);
+    *(PWCHAR)((PUINT8)Buffer + IdentSize + SuffixSize) = L'\0';
+
+    return Buffer;
+}

src/dotnet/FileSystemBase.cs

@@ -1188,6 +1188,39 @@ namespace Fsp
         {
             return STATUS_INVALID_DEVICE_REQUEST;
         }
+        /// <summary>
+        /// Inform the file system that its dispatcher has been stopped.
+        /// </summary>
+        /// <remarks>
+        /// <para>
+        /// Prior to WinFsp v2.0 the FSD would never unmount a file system volume unless
+        /// the user mode file system requested the unmount. Since WinFsp v2.0 it is possible
+        /// for the FSD to unmount a file system volume without an explicit user mode file system
+        /// request. For example, this happens when the FSD is being uninstalled.
+        /// </para><para>
+        /// A user mode file system can use this operation to determine when its dispatcher
+        /// has been stopped. The Normally parameter can be used to determine why the dispatcher
+        /// was stopped: it is TRUE when the file system is being stopped normally (i.e. via the
+        /// native FspFileSystemStopDispatcher) and FALSE otherwise.
+        /// </para><para>
+        /// A file system that uses the Service class infrastructure may use the
+        /// StopServiceIfNecessary method to correctly handle all cases. The base implementation
+        /// of this method calls the StopServiceIfNecessary method.
+        /// </para><para>
+        /// This operation is the last one that a file system will receive.
+        /// </para>
+        /// </remarks>
+        /// <param name="Normally">
+        /// TRUE if the file system is being stopped via the native FspFileSystemStopDispatcher.
+        /// FALSE if the file system is being stopped because of another reason such
+        /// as driver unload/uninstall.
+        /// </param>
+        /// <seealso cref="StopServiceIfNecessary"/>
+        public virtual void DispatcherStopped(
+            Boolean Normally)
+        {
+            StopServiceIfNecessary(Normally);
+        }
 
         /* helpers */
         /// <summary>
@@ -1483,6 +1516,10 @@ namespace Fsp
         {
             return FullEaInformation.PackedSize(EaName, EaValue, NeedEa);
         }
+        public void StopServiceIfNecessary(Boolean Normally)
+        {
+            Api.FspFileSystemStopServiceIfNecessary(IntPtr.Zero, Normally);
+        }
     }
 
 }

src/dotnet/FileSystemHost.cs

@@ -1426,6 +1426,21 @@ namespace Fsp
             }
         }
 
+        private static void DispatcherStopped(
+            IntPtr FileSystemPtr,
+            Boolean Normally)
+        {
+            FileSystemBase FileSystem = (FileSystemBase)Api.GetUserContext(FileSystemPtr);
+            try
+            {
+                FileSystem.DispatcherStopped(Normally);
+            }
+            catch (Exception ex)
+            {
+                ExceptionHandler(FileSystem, ex);
+            }
+        }
+
         static FileSystemHost()
         {
             _FileSystemInterface.GetVolumeInfo = GetVolumeInfo;
@@ -1456,6 +1471,7 @@ namespace Fsp
             _FileSystemInterface.SetDelete = SetDelete;
             _FileSystemInterface.GetEa = GetEa;
             _FileSystemInterface.SetEa = SetEa;
+            _FileSystemInterface.DispatcherStopped = DispatcherStopped;
 
             _FileSystemInterfacePtr = Marshal.AllocHGlobal(FileSystemInterface.Size);
             /* Marshal.AllocHGlobal does not zero memory; we must do it ourselves! */

src/dotnet/Interop.cs

@@ -745,6 +745,10 @@ namespace Fsp.Interop
                 out FileInfo FileInfo);
             [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
             internal delegate Int32 Obsolete0();
+            [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+            internal delegate void DispatcherStopped(
+                IntPtr FileSystem,
+                [MarshalAs(UnmanagedType.U1)] Boolean Normally);
         }
 
         internal static int Size = IntPtr.Size * 64;
@@ -781,6 +785,7 @@ namespace Fsp.Interop
         internal Proto.GetEa GetEa;
         internal Proto.SetEa SetEa;
         internal Proto.Obsolete0 Obsolete0;
+        internal Proto.DispatcherStopped DispatcherStopped;
         /* NTSTATUS (*Reserved[33])(); */
     }
 
@@ -907,6 +912,10 @@ namespace Fsp.Interop
                 UInt32 Length,
                 out UInt32 PBytesTransferred);
             [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+            internal delegate void FspFileSystemStopServiceIfNecessary(
+                IntPtr FileSystem,
+                [MarshalAs(UnmanagedType.U1)] Boolean Normally);
+            [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
             [return: MarshalAs(UnmanagedType.U1)]
             internal delegate Boolean FspFileSystemAcquireDirectoryBuffer(
                 ref IntPtr PDirBuffer,
@@ -1048,6 +1057,7 @@ namespace Fsp.Interop
         internal static Proto.FspFileSystemAddStreamInfo _FspFileSystemAddStreamInfo;
         internal static Proto.FspFileSystemAddEa _FspFileSystemAddEa;
         internal static Proto.FspFileSystemAddNotifyInfo _FspFileSystemAddNotifyInfo;
+        internal static Proto.FspFileSystemStopServiceIfNecessary FspFileSystemStopServiceIfNecessary;
         internal static Proto.FspFileSystemAcquireDirectoryBuffer FspFileSystemAcquireDirectoryBuffer;
         internal static Proto.FspFileSystemFillDirectoryBuffer FspFileSystemFillDirectoryBuffer;
         internal static Proto.FspFileSystemReleaseDirectoryBuffer FspFileSystemReleaseDirectoryBuffer;
@@ -1506,6 +1516,7 @@ namespace Fsp.Interop
             _FspFileSystemAddStreamInfo = GetEntryPoint<Proto.FspFileSystemAddStreamInfo>(Module);
             _FspFileSystemAddEa = GetEntryPoint<Proto.FspFileSystemAddEa>(Module);
             _FspFileSystemAddNotifyInfo = GetEntryPoint<Proto.FspFileSystemAddNotifyInfo>(Module);
+            FspFileSystemStopServiceIfNecessary = GetEntryPoint<Proto.FspFileSystemStopServiceIfNecessary>(Module);
             FspFileSystemAcquireDirectoryBuffer = GetEntryPoint<Proto.FspFileSystemAcquireDirectoryBuffer>(Module);
             FspFileSystemFillDirectoryBuffer = GetEntryPoint<Proto.FspFileSystemFillDirectoryBuffer>(Module);
             FspFileSystemReleaseDirectoryBuffer = GetEntryPoint<Proto.FspFileSystemReleaseDirectoryBuffer>(Module);

src/fsptool/fsptool.c

@@ -62,10 +62,12 @@ static void usage(void)
         "\n"
         "commands:\n"
         "    lsvol                           list file system devices (volumes)\n"
-        //"    list                            list running file system processes\n"
-        //"    kill                            kill file system process\n"
         "    id [NAME|SID|UID]               print user id\n"
-        "    perm [PATH|SDDL|UID:GID:MODE]   print permissions\n",
+        "    perm [PATH|SDDL|UID:GID:MODE]   print permissions\n"
+        "    lsdrv                           list drivers\n"
+        "    load                            load driver\n"
+        "    unload                          unload driver (requires load driver priv)\n"
+        "    ver                             print version\n",
         PROGNAME);
 }
 
@@ -237,6 +239,29 @@ NTSTATUS FspToolGetSidFromName(PWSTR Name, PSID *PSid)
     return STATUS_SUCCESS;
 }
 
+static int ver(int argc, wchar_t **argv)
+{
+    if (1 != argc)
+        usage();
+
+    NTSTATUS Result;
+    UINT32 Version;
+    PWSTR SxsIdent;
+
+    Result = FspVersion(&Version);
+    if (!NT_SUCCESS(Result))
+        return FspWin32FromNtStatus(Result);
+
+    SxsIdent = FspSxsIdent();
+
+    if (L'\0' == SxsIdent[0])
+        info("%u.%u", Version >> 16, Version & 0xFFFF);
+    else
+        info("%u.%u (SxS=%S)", Version >> 16, Version & 0xFFFF, SxsIdent);
+
+    return 0;
+}
+
 static NTSTATUS lsvol_dev(PWSTR DeviceName)
 {
     NTSTATUS Result;
@@ -255,7 +280,7 @@ static NTSTATUS lsvol_dev(PWSTR DeviceName)
         if (L'\0' == *P)
         {
             Drive[0] = FspToolGetDriveLetter(&LogicalDrives, VolumeName);
-            info("%-4S%S", Drive[0] ? Drive : L"", VolumeName);
+            info("%-4S%S", Drive[0] ? Drive : L"-", VolumeName);
             VolumeName = P + 1;
         }
 
@@ -541,6 +566,52 @@ static int perm(int argc, wchar_t **argv)
     return FspWin32FromNtStatus(Result);
 }
 
+static VOID lsdrv_enumfn(PVOID Context, PWSTR ServiceName, BOOLEAN Running)
+{
+    info("%-4s%S", Running ? "R" : "-", ServiceName);
+}
+
+static int lsdrv(int argc, wchar_t **argv)
+{
+    if (1 != argc)
+        usage();
+
+    NTSTATUS Result;
+
+    Result = FspFsctlEnumServices(lsdrv_enumfn, 0);
+    if (!NT_SUCCESS(Result))
+        return FspWin32FromNtStatus(Result);
+
+    return 0;
+}
+
+static int load(int argc, wchar_t **argv)
+{
+    if (1 != argc)
+        usage();
+
+    NTSTATUS Result;
+
+    Result = FspFsctlStartService();
+    if (!NT_SUCCESS(Result))
+        return FspWin32FromNtStatus(Result);
+
+    return 0;
+}
+static int unload(int argc, wchar_t **argv)
+{
+    if (1 != argc)
+        usage();
+
+    NTSTATUS Result;
+
+    Result = FspFsctlStopService();
+    if (!NT_SUCCESS(Result))
+        return FspWin32FromNtStatus(Result);
+
+    return 0;
+}
+
 int wmain(int argc, wchar_t **argv)
 {
     argc--;
@@ -549,6 +620,9 @@ int wmain(int argc, wchar_t **argv)
     if (0 == argc)
         usage();
 
+    if (0 == invariant_wcscmp(L"ver", argv[0]))
+        return ver(argc, argv);
+    else
     if (0 == invariant_wcscmp(L"lsvol", argv[0]))
         return lsvol(argc, argv);
     else
@@ -557,6 +631,15 @@ int wmain(int argc, wchar_t **argv)
     else
     if (0 == invariant_wcscmp(L"perm", argv[0]))
         return perm(argc, argv);
+    else
+    if (0 == invariant_wcscmp(L"lsdrv", argv[0]))
+        return lsdrv(argc, argv);
+    else
+    if (0 == invariant_wcscmp(L"load", argv[0]))
+        return load(argc, argv);
+    else
+    if (0 == invariant_wcscmp(L"unload", argv[0]))
+        return unload(argc, argv);
     else
         usage();
 

src/shared/ku/config.h

@@ -30,4 +30,10 @@
  */
 #define FSP_CFG_REJECT_EARLY_IRP
 
+/*
+ * SxS separator. The '+' in "WinFsp+20220906T173701Z".
+ */
+#define FSP_SXS_SEPARATOR_CHAR			'+'
+#define FSP_SXS_SEPARATOR_STRING		"+"
+
 #endif

src/sys/callbacks.c

@@ -154,8 +154,16 @@ NTSTATUS FspReleaseForModWrite(
 
     FSP_FILE_NODE *FileNode = FileObject->FsContext;
 
+    /*
+     * In some rare cases and under load the mapped page writer's TopLevelIrp
+     * may be trashed by some outside component (observed on Windows 10 1909).
+     */
+    PIRP TopLevelIrp = IoGetTopLevelIrp();
+    IoSetTopLevelIrp((PIRP)FSRTL_MOD_WRITE_TOP_LEVEL_IRP);
+
     FspFileNodeRelease(FileNode, Full);
-    ASSERT((PIRP)FSRTL_MOD_WRITE_TOP_LEVEL_IRP == IoGetTopLevelIrp());
+
+    IoSetTopLevelIrp(TopLevelIrp);
 
     FSP_LEAVE("FileObject=%p", FileObject);
 }

src/sys/device.c

@@ -30,6 +30,7 @@ NTSTATUS FspDeviceCreate(UINT32 Kind, ULONG ExtraSize,
     PDEVICE_OBJECT *PDeviceObject);
 NTSTATUS FspDeviceInitialize(PDEVICE_OBJECT DeviceObject);
 VOID FspDeviceDelete(PDEVICE_OBJECT DeviceObject);
+VOID FspDeviceDoIoDeleteDevice(PDEVICE_OBJECT DeviceObject);
 BOOLEAN FspDeviceReference(PDEVICE_OBJECT DeviceObject);
 VOID FspDeviceDereference(PDEVICE_OBJECT DeviceObject);
 _IRQL_requires_(DISPATCH_LEVEL)
@@ -67,13 +68,13 @@ NTSTATUS FspDeviceCopyList(
     PDEVICE_OBJECT **PDeviceObjects, PULONG PDeviceObjectCount);
 VOID FspDeviceDeleteList(
     PDEVICE_OBJECT *DeviceObjects, ULONG DeviceObjectCount);
-VOID FspDeviceDeleteAll(VOID);
 
 #ifdef ALLOC_PRAGMA
 #pragma alloc_text(PAGE, FspDeviceCreateSecure)
 #pragma alloc_text(PAGE, FspDeviceCreate)
 #pragma alloc_text(PAGE, FspDeviceInitialize)
 #pragma alloc_text(PAGE, FspDeviceDelete)
+#pragma alloc_text(PAGE, FspDeviceDoIoDeleteDevice)
 #pragma alloc_text(PAGE, FspFsvolDeviceInit)
 #pragma alloc_text(PAGE, FspFsvolDeviceFini)
 #pragma alloc_text(PAGE, FspFsvolDeviceCopyContextList)
@@ -92,7 +93,6 @@ VOID FspDeviceDeleteAll(VOID);
 #pragma alloc_text(PAGE, FspFsmupDeviceFini)
 #pragma alloc_text(PAGE, FspDeviceCopyList)
 #pragma alloc_text(PAGE, FspDeviceDeleteList)
-#pragma alloc_text(PAGE, FspDeviceDeleteAll)
 #endif
 
 NTSTATUS FspDeviceCreateSecure(UINT32 Kind, ULONG ExtraSize,
@@ -218,12 +218,16 @@ VOID FspDeviceDelete(PDEVICE_OBJECT DeviceObject)
         return;
     }
 
-#if DBG
-#pragma prefast(suppress:28175, "Debugging only: ok to access DeviceObject->Size")
-    RtlFillMemory(&DeviceExtension->Kind,
-        (PUINT8)DeviceObject + DeviceObject->Size - (PUINT8)&DeviceExtension->Kind, 0xBD);
-#endif
+    FspDeviceDoIoDeleteDevice(DeviceObject);
+}
 
+VOID FspDeviceDoIoDeleteDevice(PDEVICE_OBJECT DeviceObject)
+{
+    PAGED_CODE();
+
+    FSP_DEVICE_EXTENSION *DeviceExtension = FspDeviceExtension(DeviceObject);
+
+    if (0 == InterlockedCompareExchange(&DeviceExtension->DidIoDeleteDevice, 1, 0))
         IoDeleteDevice(DeviceObject);
 }
 
@@ -942,22 +946,4 @@ VOID FspDeviceDeleteList(
     FspFree(DeviceObjects);
 }
 
-VOID FspDeviceDeleteAll(VOID)
-{
-    PAGED_CODE();
-
-    NTSTATUS Result;
-    PDEVICE_OBJECT *DeviceObjects = 0;
-    ULONG DeviceObjectCount = 0;
-
-    Result = FspDeviceCopyList(&DeviceObjects, &DeviceObjectCount);
-    if (!NT_SUCCESS(Result))
-        return;
-
-    for (ULONG i = 0; DeviceObjectCount > i; i++)
-        FspDeviceDelete(DeviceObjects[i]);
-
-    FspDeviceDeleteList(DeviceObjects, DeviceObjectCount);
-}
-
 FAST_MUTEX FspDeviceGlobalMutex;

src/sys/devtimer.c

@@ -55,6 +55,7 @@ NTSTATUS FspDeviceInitializeAllTimers(VOID)
 VOID FspDeviceFinalizeAllTimers(VOID)
 {
     KeCancelTimer(&FspDeviceTimer);
+    KeFlushQueuedDpcs();
 
 #if DBG
     KIRQL Irql;

src/sys/driver.c

@@ -22,15 +22,24 @@
 #include <sys/driver.h>
 
 DRIVER_INITIALIZE DriverEntry;
+static DRIVER_UNLOAD DriverUnload;
 static VOID FspDriverMultiVersionInitialize(VOID);
 static NTSTATUS FspDriverInitializeDevices(VOID);
 static VOID FspDriverFinalizeDevices(VOID);
+static VOID FspDriverFinalizeDevicesForUnload(VOID);
+static VOID FspDriverFinalizeDevicesEx(BOOLEAN DeleteDevices);
+NTSTATUS FspDriverUnload(
+    PDEVICE_OBJECT FsctlDeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp);
 
 #ifdef ALLOC_PRAGMA
 #pragma alloc_text(INIT, DriverEntry)
+#pragma alloc_text(PAGE, DriverUnload)
 #pragma alloc_text(INIT, FspDriverMultiVersionInitialize)
 #pragma alloc_text(PAGE, FspDriverInitializeDevices)
 #pragma alloc_text(PAGE, FspDriverFinalizeDevices)
+#pragma alloc_text(PAGE, FspDriverFinalizeDevicesForUnload)
+#pragma alloc_text(PAGE, FspDriverFinalizeDevicesEx)
+#pragma alloc_text(PAGE, FspDriverUnload)
 #endif
 
 NTSTATUS DriverEntry(
@@ -40,7 +49,10 @@ NTSTATUS DriverEntry(
 
     FSP_TRACE_INIT();
 
+    FspSxsIdentInitialize(&DriverObject->DriverName);
+
     /* setup the driver object */
+    DriverObject->DriverUnload = DriverUnload;
     DriverObject->MajorFunction[IRP_MJ_CREATE] = FspCreate;
     DriverObject->MajorFunction[IRP_MJ_CLOSE] = FspClose;
     DriverObject->MajorFunction[IRP_MJ_READ] = FspRead;
@@ -128,6 +140,7 @@ NTSTATUS DriverEntry(
     FspDriverObject = DriverObject;
     FspDriverMultiVersionInitialize();
 
+    ExInitializeFastMutex(&FspDriverUnloadMutex);
     ExInitializeFastMutex(&FspDeviceGlobalMutex);
 
     Result = FspSiloInitialize(FspDriverInitializeDevices, FspDriverFinalizeDevices);
@@ -176,6 +189,26 @@ exit:
         &DriverObject->DriverName, RegistryPath);
 }
 
+VOID DriverUnload(
+    PDRIVER_OBJECT DriverObject)
+{
+    FSP_ENTER_VOID(PAGED_CODE());
+
+    FspDriverFinalizeDevices();
+
+    FspDeviceFinalizeAllTimers();
+
+    FspProcessBufferFinalize();
+
+    FspSiloFinalize();
+
+    FSP_TRACE_FINI();
+
+#pragma prefast(suppress:28175, "We are in DriverUnload: ok to access DriverName")
+    FSP_LEAVE_VOID("DriverName=\"%wZ\"",
+        &DriverObject->DriverName);
+}
+
 static VOID FspDriverMultiVersionInitialize(VOID)
 {
     FspProcessorCount = KeQueryActiveProcessorCount(0);
@@ -206,6 +239,8 @@ static NTSTATUS FspDriverInitializeDevices(VOID)
     FSP_SILO_GLOBALS *Globals;
     UNICODE_STRING DeviceSddl;
     UNICODE_STRING DeviceName;
+    WCHAR DeviceNameBuf[128];
+    UNICODE_STRING SymlinkName;
     GUID Guid;
     NTSTATUS Result;
 
@@ -214,20 +249,46 @@ static NTSTATUS FspDriverInitializeDevices(VOID)
 
     /* create the file system control device objects */
     RtlInitUnicodeString(&DeviceSddl, L"" FSP_FSCTL_DEVICE_SDDL);
-    RtlInitUnicodeString(&DeviceName, L"\\Device\\" FSP_FSCTL_DISK_DEVICE_NAME);
+    RtlInitEmptyUnicodeString(&DeviceName, DeviceNameBuf, sizeof DeviceNameBuf);
+    Result = RtlUnicodeStringPrintf(&DeviceName,
+        L"\\Device\\" FSP_FSCTL_DISK_DEVICE_NAME "%wZ",
+        FspSxsSuffix());
+    ASSERT(NT_SUCCESS(Result));
     Result = FspDeviceCreateSecure(FspFsctlDeviceExtensionKind, 0,
         &DeviceName, FILE_DEVICE_DISK_FILE_SYSTEM, FILE_DEVICE_SECURE_OPEN,
         &DeviceSddl, &FspFsctlDeviceClassGuid,
         &Globals->FsctlDiskDeviceObject);
     if (!NT_SUCCESS(Result))
         goto exit;
-    RtlInitUnicodeString(&DeviceName, L"\\Device\\" FSP_FSCTL_NET_DEVICE_NAME);
+    if (0 != FspSxsIdent()->Length)
+    {
+        /* \Device\WinFsp.Disk SxS symlink */
+        RtlInitUnicodeString(&SymlinkName, L"\\Device\\" FSP_FSCTL_DISK_DEVICE_NAME);
+        Result = IoCreateSymbolicLink(&SymlinkName, &DeviceName);
+        if (!NT_SUCCESS(Result))
+            goto exit;
+        Globals->InitDoneSymlinkDisk = 1;
+    }
+    RtlInitEmptyUnicodeString(&DeviceName, DeviceNameBuf, sizeof DeviceNameBuf);
+    Result = RtlUnicodeStringPrintf(&DeviceName,
+        L"\\Device\\" FSP_FSCTL_NET_DEVICE_NAME "%wZ",
+        FspSxsSuffix());
+    ASSERT(NT_SUCCESS(Result));
     Result = FspDeviceCreateSecure(FspFsctlDeviceExtensionKind, 0,
         &DeviceName, FILE_DEVICE_NETWORK_FILE_SYSTEM, FILE_DEVICE_SECURE_OPEN,
         &DeviceSddl, &FspFsctlDeviceClassGuid,
         &Globals->FsctlNetDeviceObject);
     if (!NT_SUCCESS(Result))
         goto exit;
+    if (0 != FspSxsIdent()->Length)
+    {
+        /* \Device\WinFsp.Net SxS symlink */
+        RtlInitUnicodeString(&SymlinkName, L"\\Device\\" FSP_FSCTL_NET_DEVICE_NAME);
+        Result = IoCreateSymbolicLink(&SymlinkName, &DeviceName);
+        if (!NT_SUCCESS(Result))
+            goto exit;
+        Globals->InitDoneSymlinkNet = 1;
+    }
     Result = FspDeviceCreate(FspFsmupDeviceExtensionKind, 0,
         FILE_DEVICE_NETWORK_FILE_SYSTEM, FILE_REMOTE_DEVICE,
         &Globals->FsmupDeviceObject);
@@ -261,8 +322,9 @@ static NTSTATUS FspDriverInitializeDevices(VOID)
     Result = RtlUnicodeStringPrintf(&DeviceName,
         0 == ((PULONG)&Guid)[0] && 0 == ((PULONG)&Guid)[1] &&
         0 == ((PULONG)&Guid)[2] && 0 == ((PULONG)&Guid)[3] ?
-            L"\\Device\\" FSP_FSCTL_MUP_DEVICE_NAME :
-            L"\\Device\\" FSP_FSCTL_MUP_DEVICE_NAME "{%08lx-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}",
+            L"\\Device\\" FSP_FSCTL_MUP_DEVICE_NAME "%wZ":
+            L"\\Device\\" FSP_FSCTL_MUP_DEVICE_NAME "%wZ{%08lx-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}",
+        FspSxsSuffix(),
         Guid.Data1, Guid.Data2, Guid.Data3,
         Guid.Data4[0], Guid.Data4[1], Guid.Data4[2], Guid.Data4[3],
         Guid.Data4[4], Guid.Data4[5], Guid.Data4[6], Guid.Data4[7]);
@@ -281,12 +343,25 @@ static NTSTATUS FspDriverInitializeDevices(VOID)
      * as a file system; we register with the MUP instead.
      */
     IoRegisterFileSystem(Globals->FsctlDiskDeviceObject);
+    Globals->InitDoneRegisterDisk = 1;
+
+    /*
+     * Reference primary device objects to allow for IoDeleteDevice during FspDriverUnload.
+     */
+    ObReferenceObject(Globals->FsctlDiskDeviceObject);
+    ObReferenceObject(Globals->FsctlNetDeviceObject);
+    ObReferenceObject(Globals->FsmupDeviceObject);
 
     Result = STATUS_SUCCESS;
 
 exit:
     if (!NT_SUCCESS(Result))
     {
+        if (Globals->InitDoneRegisterDisk)
+        {
+            IoUnregisterFileSystem(Globals->FsctlDiskDeviceObject);
+            Globals->InitDoneRegisterDisk = 0;
+        }
         if (0 != Globals->MupHandle)
         {
             FsRtlDeregisterUncProvider(Globals->MupHandle);
@@ -297,11 +372,23 @@ exit:
             FspDeviceDelete(Globals->FsmupDeviceObject);
             Globals->FsmupDeviceObject = 0;
         }
+        if (Globals->InitDoneSymlinkNet)
+        {
+            RtlInitUnicodeString(&SymlinkName, L"\\Device\\" FSP_FSCTL_NET_DEVICE_NAME);
+            IoDeleteSymbolicLink(&SymlinkName);
+            Globals->InitDoneSymlinkNet = 0;
+        }
         if (0 != Globals->FsctlNetDeviceObject)
         {
             FspDeviceDelete(Globals->FsctlNetDeviceObject);
             Globals->FsctlNetDeviceObject = 0;
         }
+        if (Globals->InitDoneSymlinkDisk)
+        {
+            RtlInitUnicodeString(&SymlinkName, L"\\Device\\" FSP_FSCTL_DISK_DEVICE_NAME);
+            IoDeleteSymbolicLink(&SymlinkName);
+            Globals->InitDoneSymlinkDisk = 0;
+        }
         if (0 != Globals->FsctlDiskDeviceObject)
         {
             FspDeviceDelete(Globals->FsctlDiskDeviceObject);
@@ -318,40 +405,151 @@ static VOID FspDriverFinalizeDevices(VOID)
 {
     PAGED_CODE();
 
+    FspDriverFinalizeDevicesEx(TRUE);
+}
+
+static VOID FspDriverFinalizeDevicesForUnload(VOID)
+{
+    PAGED_CODE();
+
+    FspDriverFinalizeDevicesEx(FALSE);
+}
+
+static VOID FspDriverFinalizeDevicesEx(BOOLEAN DeleteDevices)
+{
+    PAGED_CODE();
+
     FSP_SILO_GLOBALS *Globals;
+    UNICODE_STRING SymlinkName;
 
     FspSiloGetGlobals(&Globals);
     ASSERT(0 != Globals);
 
+    if (Globals->InitDoneRegisterDisk)
+    {
         IoUnregisterFileSystem(Globals->FsctlDiskDeviceObject);
-
+        Globals->InitDoneRegisterDisk = 0;
+    }
     if (0 != Globals->MupHandle)
     {
         FsRtlDeregisterUncProvider(Globals->MupHandle);
         Globals->MupHandle = 0;
     }
     if (0 != Globals->FsmupDeviceObject)
+    {
+        if (DeleteDevices)
         {
             FspDeviceDelete(Globals->FsmupDeviceObject);
+            ObDereferenceObject(Globals->FsmupDeviceObject);
             Globals->FsmupDeviceObject = 0;
         }
+        else
+            FspDeviceDoIoDeleteDevice(Globals->FsmupDeviceObject);
+    }
+    if (Globals->InitDoneSymlinkNet)
+    {
+        RtlInitUnicodeString(&SymlinkName, L"\\Device\\" FSP_FSCTL_NET_DEVICE_NAME);
+        IoDeleteSymbolicLink(&SymlinkName);
+        Globals->InitDoneSymlinkNet = 0;
+    }
     if (0 != Globals->FsctlNetDeviceObject)
+    {
+        if (DeleteDevices)
         {
             FspDeviceDelete(Globals->FsctlNetDeviceObject);
+            ObDereferenceObject(Globals->FsctlNetDeviceObject);
             Globals->FsctlNetDeviceObject = 0;
         }
+        else
+            FspDeviceDoIoDeleteDevice(Globals->FsctlNetDeviceObject);
+    }
+    if (Globals->InitDoneSymlinkDisk)
+    {
+        RtlInitUnicodeString(&SymlinkName, L"\\Device\\" FSP_FSCTL_DISK_DEVICE_NAME);
+        IoDeleteSymbolicLink(&SymlinkName);
+        Globals->InitDoneSymlinkDisk = 0;
+    }
     if (0 != Globals->FsctlDiskDeviceObject)
+    {
+        if (DeleteDevices)
         {
             FspDeviceDelete(Globals->FsctlDiskDeviceObject);
+            ObDereferenceObject(Globals->FsctlDiskDeviceObject);
             Globals->FsctlDiskDeviceObject = 0;
         }
+        else
+            FspDeviceDoIoDeleteDevice(Globals->FsctlDiskDeviceObject);
+    }
 
     FspSiloDereferenceGlobals(Globals);
 }
 
+NTSTATUS FspDriverUnload(
+    PDEVICE_OBJECT FsctlDeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp)
+{
+    PAGED_CODE();
+
+    ASSERT(IRP_MJ_FILE_SYSTEM_CONTROL == IrpSp->MajorFunction);
+    ASSERT(IRP_MN_USER_FS_REQUEST == IrpSp->MinorFunction);
+    ASSERT(FSP_FSCTL_UNLOAD == IrpSp->Parameters.FileSystemControl.FsControlCode);
+
+    NTSTATUS Result;
+    UNICODE_STRING DriverServiceName, DriverName, Remain;
+    WCHAR DriverServiceNameBuf[64 + 256];
+    PDEVICE_OBJECT *DeviceObjects = 0;
+    ULONG DeviceObjectCount = 0;
+
+    if (!FspSiloIsHost())
+        return STATUS_INVALID_DEVICE_REQUEST;
+
+    if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_LOAD_DRIVER_PRIVILEGE), UserMode))
+        return STATUS_PRIVILEGE_NOT_HELD;
+
+    ExAcquireFastMutexUnsafe(&FspDriverUnloadMutex);
+
+    if (!FspDriverUnloadDone)
+    {
+        FspFileNameSuffix(&FspDriverObject->DriverName, &Remain, &DriverName);
+        RtlInitEmptyUnicodeString(&DriverServiceName, DriverServiceNameBuf, sizeof DriverServiceNameBuf);
+        Result = RtlUnicodeStringPrintf(&DriverServiceName,
+            L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\%wZ", &DriverName);
+        if (!NT_SUCCESS(Result))
+            goto exit;
+        Result = ZwUnloadDriver(&DriverServiceName);
+        if (!NT_SUCCESS(Result))
+            goto exit;
+
+        FspSiloEnumerate(FspDriverFinalizeDevicesForUnload);
+        FspDriverFinalizeDevicesForUnload();
+
+        Result = FspDeviceCopyList(&DeviceObjects, &DeviceObjectCount);
+        if (NT_SUCCESS(Result))
+        {
+            for (ULONG I = 0; DeviceObjectCount > I; I++)
+            {
+                FSP_DEVICE_EXTENSION *DeviceExtension = FspDeviceExtension(DeviceObjects[I]);
+                if (FspFsvolDeviceExtensionKind == DeviceExtension->Kind)
+                    FspIoqStop(((FSP_FSVOL_DEVICE_EXTENSION *)DeviceExtension)->Ioq, FALSE);
+            }
+            FspDeviceDeleteList(DeviceObjects, DeviceObjectCount);
+        }
+
+        FspDriverUnloadDone = TRUE;
+    }
+
+    Result = STATUS_SUCCESS;
+
+exit:
+    ExReleaseFastMutexUnsafe(&FspDriverUnloadMutex);
+
+    return Result;
+}
+
 PDRIVER_OBJECT FspDriverObject;
 FAST_IO_DISPATCH FspFastIoDispatch;
 CACHE_MANAGER_CALLBACKS FspCacheManagerCallbacks;
+FAST_MUTEX FspDriverUnloadMutex;
+BOOLEAN FspDriverUnloadDone;
 
 ULONG FspProcessorCount;
 FSP_MV_CcCoherencyFlushAndPurgeCache *FspMvCcCoherencyFlushAndPurgeCache;

src/sys/driver.h

@@ -364,6 +364,10 @@ VOID FspTraceNtStatus(const char *file, int line, const char *func, NTSTATUS Sta
 /* missing typedef */
 typedef const void *PCVOID;
 
+/* driver unload */
+NTSTATUS FspDriverUnload(
+    PDEVICE_OBJECT FsctlDeviceObject, PIRP Irp, PIO_STACK_LOCATION IrpSp);
+
 /* driver major functions */
 _Function_class_(DRIVER_DISPATCH)
 _IRQL_requires_max_(APC_LEVEL)
@@ -739,23 +743,34 @@ LONG FspCompareUnicodeString(
     PCUNICODE_STRING String2,
     BOOLEAN CaseInsensitive);
 
+/* SxS */
+VOID FspSxsIdentInitialize(PUNICODE_STRING DriverName);
+PUNICODE_STRING FspSxsIdent(VOID);
+PUNICODE_STRING FspSxsSuffix(VOID);
+
 /* silos */
 typedef struct
 {
+    PVOID Silo;
+    LIST_ENTRY ListEntry;
     PDEVICE_OBJECT FsctlDiskDeviceObject;
     PDEVICE_OBJECT FsctlNetDeviceObject;
     PDEVICE_OBJECT FsmupDeviceObject;
     HANDLE MupHandle;
-    WCHAR FsmupDeviceNameBuf[64];
+    WCHAR FsmupDeviceNameBuf[128];
+    UINT32 InitDoneSymlinkDisk:1, InitDoneSymlinkNet:1, InitDoneRegisterDisk:1;
 } FSP_SILO_GLOBALS;
 typedef NTSTATUS (*FSP_SILO_INIT_CALLBACK)(VOID);
 typedef VOID (*FSP_SILO_FINI_CALLBACK)(VOID);
+typedef VOID (*FSP_SILO_ENUM_CALLBACK)(VOID);
+BOOLEAN FspSiloIsHost(VOID);
 NTSTATUS FspSiloGetGlobals(FSP_SILO_GLOBALS **PGlobals);
 VOID FspSiloDereferenceGlobals(FSP_SILO_GLOBALS *Globals);
 VOID FspSiloGetContainerId(GUID *ContainerId);
 NTSTATUS FspSiloInitialize(FSP_SILO_INIT_CALLBACK Init, FSP_SILO_FINI_CALLBACK Fini);
 NTSTATUS FspSiloPostInitialize(VOID);
 VOID FspSiloFinalize(VOID);
+VOID FspSiloEnumerate(FSP_SILO_ENUM_CALLBACK EnumFn);
 
 /* process buffers */
 #define FspProcessBufferSizeMax         (64 * 1024)
@@ -1182,8 +1197,8 @@ typedef struct
     KSPIN_LOCK SpinLock;
     LONG RefCount;
     UINT32 Kind;
-    /* IoTimer emulation */
-    FSP_DEVICE_TIMER DeviceTimer;
+    FSP_DEVICE_TIMER DeviceTimer;       /* IoTimer emulation */
+    LONG DidIoDeleteDevice;
 } FSP_DEVICE_EXTENSION;
 typedef struct
 {
@@ -1285,6 +1300,7 @@ NTSTATUS FspDeviceCreate(UINT32 Kind, ULONG ExtraSize,
     PDEVICE_OBJECT *PDeviceObject);
 NTSTATUS FspDeviceInitialize(PDEVICE_OBJECT DeviceObject);
 VOID FspDeviceDelete(PDEVICE_OBJECT DeviceObject);
+VOID FspDeviceDoIoDeleteDevice(PDEVICE_OBJECT DeviceObject);
 BOOLEAN FspDeviceReference(PDEVICE_OBJECT DeviceObject);
 VOID FspDeviceDereference(PDEVICE_OBJECT DeviceObject);
 static inline
@@ -1467,7 +1483,6 @@ NTSTATUS FspDeviceCopyList(
     PDEVICE_OBJECT **PDeviceObjects, PULONG PDeviceObjectCount);
 VOID FspDeviceDeleteList(
     PDEVICE_OBJECT *DeviceObjects, ULONG DeviceObjectCount);
-VOID FspDeviceDeleteAll(VOID);
 NTSTATUS FspDeviceInitializeAllTimers(VOID);
 VOID FspDeviceFinalizeAllTimers(VOID);
 NTSTATUS FspDeviceInitializeTimer(PDEVICE_OBJECT DeviceObject,
@@ -1999,6 +2014,8 @@ FSP_MV_CcCoherencyFlushAndPurgeCache(
 extern PDRIVER_OBJECT FspDriverObject;
 extern FAST_IO_DISPATCH FspFastIoDispatch;
 extern CACHE_MANAGER_CALLBACKS FspCacheManagerCallbacks;
+extern FAST_MUTEX FspDriverUnloadMutex;
+extern BOOLEAN FspDriverUnloadDone;
 extern FSP_IOPREP_DISPATCH *FspIopPrepareFunction[];
 extern FSP_IOCMPL_DISPATCH *FspIopCompleteFunction[];
 extern FAST_MUTEX FspDeviceGlobalMutex;

src/sys/driver.inf.in

@@ -8,7 +8,7 @@ Provider = !Provider!
 [DestinationDirs]
 DefaultDestDir = 12
 
-[DefaultInstall]
+[DefaultInstall.!ArchDecoration!]
 CopyFiles = Driver.CopyFiles
 
 [Driver.CopyFiles]

src/sys/fsctl.c

@@ -128,6 +128,9 @@ static NTSTATUS FspFsctlFileSystemControl(
             if (0 != IrpSp->FileObject->FsContext2)
                 Result = FspVolumeNotify(FsctlDeviceObject, Irp, IrpSp);
             break;
+        case FSP_FSCTL_UNLOAD:
+            Result = FspDriverUnload(FsctlDeviceObject, Irp, IrpSp);
+            break;
         default:
             if (CTL_CODE(0, 0xC00, 0, 0) ==
                 (IrpSp->Parameters.FileSystemControl.FsControlCode & CTL_CODE(0, 0xC00, 0, 0)))

src/sys/psbuffer.c

@@ -123,6 +123,27 @@ NTSTATUS FspProcessBufferInitialize(VOID)
 VOID FspProcessBufferFinalize(VOID)
 {
     PsSetCreateProcessNotifyRoutine(FspProcessBufferNotifyRoutine, TRUE);
+
+    /*
+     * Free any items in our process hash table.
+     * Any virtual memory was released when the corresponding processes went away.
+     */
+    for (ULONG HashIndex = 0; ProcessBufferBucketCount > HashIndex; HashIndex++)
+    {
+        for (FSP_PROCESS_BUFFER_ITEM *Item = ProcessBufferBuckets[HashIndex], *DictNext; Item; Item = DictNext)
+        {
+            for (FSP_PROCESS_BUFFER_LIST_ENTRY *P = Item->BufferList, *Next; P; P = Next)
+            {
+                Next = P->Next;
+                FspFree(P);
+            }
+
+            DictNext = Item->DictNext;
+            FspFree(Item);
+        }
+
+        ProcessBufferBuckets[HashIndex] = 0;
+    }
 }
 
 static VOID FspProcessBufferNotifyRoutine(HANDLE ParentId, HANDLE ProcessId, BOOLEAN Create)

src/sys/silo.c

@@ -110,6 +110,9 @@ static FSP_SILO_INIT_CALLBACK FspSiloInitCallback;
 static FSP_SILO_FINI_CALLBACK FspSiloFiniCallback;
 static BOOLEAN FspSiloInitDone = FALSE;
 
+static FAST_MUTEX FspSiloListMutex;
+static LIST_ENTRY FspSiloList;
+
 static FSP_SILO_GLOBALS FspSiloHostGlobals;
 
 #define FSP_SILO_MONITOR_REGISTRATION_VERSION 1
@@ -125,6 +128,11 @@ static FSP_SILO_GLOBALS FspSiloHostGlobals;
     }
 #define CALL(n)                         (FspSilo ## n)
 
+BOOLEAN FspSiloIsHost(VOID)
+{
+    return !FspSiloInitDone || 0 == CALL(PsGetCurrentServerSilo)();
+}
+
 NTSTATUS FspSiloGetGlobals(FSP_SILO_GLOBALS **PGlobals)
 {
     FSP_PESILO Silo;
@@ -191,6 +199,7 @@ static NTSTATUS NTAPI FspSiloMonitorCreateCallback(FSP_PESILO Silo)
     if (!NT_SUCCESS(Result))
         goto exit;
     RtlZeroMemory(Globals, sizeof(FSP_SILO_GLOBALS));
+    Globals->Silo = Silo;
 
     /* PsInsertSiloContext adds reference to Globals */
     Result = CALL(PsInsertSiloContext)(Silo, ContextSlot, Globals);
@@ -198,6 +207,9 @@ static NTSTATUS NTAPI FspSiloMonitorCreateCallback(FSP_PESILO Silo)
         goto exit;
     Inserted = TRUE;
 
+    FsRtlEnterFileSystem();
+    ExAcquireFastMutexUnsafe(&FspSiloListMutex);
+
     if (0 != FspSiloInitCallback)
     {
         FSP_PESILO PreviousSilo = CALL(PsAttachSiloToCurrentThread)(Silo);
@@ -205,6 +217,12 @@ static NTSTATUS NTAPI FspSiloMonitorCreateCallback(FSP_PESILO Silo)
         CALL(PsDetachSiloFromCurrentThread)(PreviousSilo);
     }
 
+    if (NT_SUCCESS(Result))
+        InsertTailList(&FspSiloList, &Globals->ListEntry);
+
+    ExReleaseFastMutexUnsafe(&FspSiloListMutex);
+    FsRtlExitFileSystem();
+
 exit:
     if (!NT_SUCCESS(Result))
     {
@@ -239,6 +257,11 @@ static VOID NTAPI FspSiloMonitorTerminateCallback(FSP_PESILO Silo)
     Result = CALL(PsGetSiloContext)(Silo, ContextSlot, &Globals);
     if (!NT_SUCCESS(Result))
         return;
+
+    FsRtlEnterFileSystem();
+    ExAcquireFastMutexUnsafe(&FspSiloListMutex);
+
+    RemoveEntryList(&Globals->ListEntry);
     CALL(PsDereferenceSiloContext)(Globals);
     Globals = 0;
 
@@ -249,6 +272,9 @@ static VOID NTAPI FspSiloMonitorTerminateCallback(FSP_PESILO Silo)
         CALL(PsDetachSiloFromCurrentThread)(PreviousSilo);
     }
 
+    ExReleaseFastMutexUnsafe(&FspSiloListMutex);
+    FsRtlExitFileSystem();
+
     /* PsRemoveSiloContext removes reference to Globals (possibly freeing it) */
     CALL(PsRemoveSiloContext)(Silo, ContextSlot, 0);
 }
@@ -257,6 +283,9 @@ NTSTATUS FspSiloInitialize(FSP_SILO_INIT_CALLBACK Init, FSP_SILO_FINI_CALLBACK F
 {
     NTSTATUS Result = STATUS_SUCCESS;
 
+    ExInitializeFastMutex(&FspSiloListMutex);
+    InitializeListHead(&FspSiloList);
+
     if (FspIsNtDdiVersionAvailable(NTDDI_WIN10_RS5))
     {
         ULONG Fail = 0;
@@ -329,8 +358,47 @@ VOID FspSiloFinalize(VOID)
 
     CALL(PsUnregisterSiloMonitor)(FspSiloMonitor);
 
+#if DBG
+    FsRtlEnterFileSystem();
+    ExAcquireFastMutexUnsafe(&FspSiloListMutex);
+    ASSERT(IsListEmpty(&FspSiloList));
+    ExReleaseFastMutexUnsafe(&FspSiloListMutex);
+    FsRtlExitFileSystem();
+#endif
+
     FspSiloMonitor = 0;
     FspSiloInitCallback = 0;
     FspSiloFiniCallback = 0;
     FspSiloInitDone = FALSE;
 }
+
+VOID FspSiloEnumerate(FSP_SILO_ENUM_CALLBACK EnumFn)
+{
+    KAPC_STATE ApcState;
+    PLIST_ENTRY ListEntry;
+    FSP_SILO_GLOBALS *Globals;
+
+    FsRtlEnterFileSystem();
+    ExAcquireFastMutexUnsafe(&FspSiloListMutex);
+
+    if (!IsListEmpty(&FspSiloList))
+    {
+        KeStackAttachProcess(PsInitialSystemProcess, &ApcState);
+
+        for (ListEntry = FspSiloList.Flink;
+            &FspSiloList != ListEntry;
+            ListEntry = ListEntry->Flink)
+        {
+            Globals = CONTAINING_RECORD(ListEntry, FSP_SILO_GLOBALS, ListEntry);
+
+            FSP_PESILO PreviousSilo = CALL(PsAttachSiloToCurrentThread)(Globals->Silo);
+            EnumFn();
+            CALL(PsDetachSiloFromCurrentThread)(PreviousSilo);
+        }
+
+        KeUnstackDetachProcess(&ApcState);
+    }
+
+    ExReleaseFastMutexUnsafe(&FspSiloListMutex);
+    FsRtlExitFileSystem();
+}

src/sys/sxs.c

@@ -0,0 +1,71 @@
+/**
+ * @file sys/sxs.c
+ *
+ * @copyright 2015-2022 Bill Zissimopoulos
+ */
+/*
+ * This file is part of WinFsp.
+ *
+ * You can redistribute it and/or modify it under the terms of the GNU
+ * General Public License version 3 as published by the Free Software
+ * Foundation.
+ *
+ * Licensees holding a valid commercial license may use this software
+ * in accordance with the commercial license agreement provided in
+ * conjunction with the software.  The terms and conditions of any such
+ * commercial license agreement shall govern, supersede, and render
+ * ineffective any application of the GPLv3 license to this software,
+ * notwithstanding of any reference thereto in the software or
+ * associated repository.
+ */
+
+#include <sys/driver.h>
+
+VOID FspSxsIdentInitialize(PUNICODE_STRING DriverName);
+PUNICODE_STRING FspSxsIdent(VOID);
+PUNICODE_STRING FspSxsSuffix(VOID);
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text(INIT, FspSxsIdentInitialize)
+#endif
+
+static WCHAR FspSxsIdentBuf[32 + 1] = L"";
+static UNICODE_STRING FspSxsIdentStr = { 0, sizeof FspSxsIdentBuf - 1, FspSxsIdentBuf + 1 };
+static UNICODE_STRING FspSxsSuffixStr = { 0, sizeof FspSxsIdentBuf, FspSxsIdentBuf };
+
+VOID FspSxsIdentInitialize(PUNICODE_STRING DriverName)
+{
+    PWCHAR Ident = 0;
+    USHORT Length;
+
+    for (PWCHAR P = DriverName->Buffer + DriverName->Length / sizeof(WCHAR) - 1; DriverName->Buffer <= P; P--)
+    {
+        if (L'\\' == *P)
+            break;
+        if (FSP_SXS_SEPARATOR_CHAR == *P)
+        {
+            Ident = P;
+            break;
+        }
+    }
+    if (0 == Ident)
+        return;
+
+    Length = (USHORT)(((PUINT8)DriverName->Buffer + DriverName->Length) - (PUINT8)Ident);
+    if (Length > sizeof FspSxsIdentBuf)
+        Length = sizeof FspSxsIdentBuf;
+
+    RtlCopyMemory(FspSxsIdentBuf, Ident, Length);
+    FspSxsIdentStr.Length = Length - sizeof(WCHAR);
+    FspSxsSuffixStr.Length = Length;
+}
+
+PUNICODE_STRING FspSxsIdent(VOID)
+{
+    return &FspSxsIdentStr;
+}
+
+PUNICODE_STRING FspSxsSuffix(VOID)
+{
+    return &FspSxsSuffixStr;
+}

tools/build.bat

@@ -27,6 +27,7 @@ if X%~nx0==Xbuild-choco.bat (
 set BuildArm64=yes
 if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" (
     set BuildArm64=no
+    set UseDotnetSdk=yes
 )
 if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" (
     set BuildArm64=no
@@ -42,8 +43,11 @@ call "%~dp0vcvarsall.bat" x64
 if not X%SignedPackage%==X (
     if not exist "%~dp0..\build\VStudio\build\%Configuration%\%MyProductFileName%-*.msi" (echo previous build not found >&2 & exit /b 1)
     if not exist "%SignedPackage%" (echo signed package not found >&2 & exit /b 1)
+    set Version=
+    for %%f in (build\%Configuration%\%MyProductFileName%-*.msi) do set Version=%%~nf
+    set Version=!Version:%MyProductFileName%-=!
     del "%~dp0..\build\VStudio\build\%Configuration%\%MyProductFileName%-*.msi"
-    if exist "%~dp0..\build\VStudio\build\%Configuration%\winfsp.*.nupkg" del "%~dp0..\build\VStudio\build\%Configuration%\winfsp.*.nupkg"
+    if exist "%~dp0..\build\VStudio\build\%Configuration%\winfsp.!Version!.nupkg" del "%~dp0..\build\VStudio\build\%Configuration%\winfsp.!Version!.nupkg"
     for /R "%SignedPackage%" %%f in (*.sys) do (
         copy "%%f" "%~dp0..\build\VStudio\build\%Configuration%" >nul
     )
@@ -70,6 +74,13 @@ if X%SignedPackage%==X (
         if errorlevel 1 goto fail
     )
 
+    if X%UseDotnetSdk%==Xyes (
+        dotnet build ./dotnet/winfsp.net.csproj -c "%Configuration%" -p:Platform=AnyCPU -p:SolutionDir="%cd%"\
+        if errorlevel 1 goto fail
+        dotnet build ./testing/memfs-dotnet.csproj -c "%Configuration%" -p:Platform=AnyCPU -p:SolutionDir="%cd%"\
+        if errorlevel 1 goto fail
+    )
+
     pushd build\%Configuration%
     set signfiles=^
         %MyProductFileName%-a64.sys %MyProductFileName%-x64.sys %MyProductFileName%-x86.sys^

tools/deploy.bat

@@ -27,6 +27,7 @@ for %%f in (
         winfsp-%Suffix%.dll
         winfsp-tests-%Suffix%.exe
         memfs-%Suffix%.exe
+        fsptool-%Suffix%.exe
         deploy-setup.bat
         docker-run.bat
     ) do (

tools/diag.bat

@@ -1,28 +1,53 @@
 @echo off
 
 setlocal
+setlocal EnableDelayedExpansion
 
-echo WINFSP INSTALLATION DIRECTORY AND LAUNCHER REGISTRATIONS
-reg query HKLM\SOFTWARE\WinFsp /s /reg:32
+REM Determine the SxS (side-by-side) identifier.
+set SxsDir=
+set RegKey="HKLM\SOFTWARE\WinFsp"
+set RegVal="SxsDir"
+reg query !RegKey! /v !RegVal! /reg:32 >nul 2>&1
+if !ERRORLEVEL! equ 0 (
+    for /f "tokens=2,*" %%i in ('reg query !RegKey! /v !RegVal! /reg:32 ^| findstr !RegVal!') do (
+        set SxsDir=%%j
+    )
+)
+set SxsSuffix=
+if defined SxsDir (
+    set SxsSuffix=!SxsDir:*SxS\sxs.=!
+    if !SxsSuffix:~-1!==\ set SxsSuffix=!SxsSuffix:~0,-1!
+    set SxsSuffix=+!SxsSuffix!
+)
+
+echo WINFSP FSD
+sc query WinFsp!SxsSuffix!
+sc qc WinFsp!SxsSuffix!
+sc sdshow WinFsp!SxsSuffix!
+echo.
 echo.
 
-echo WINFSP DLL REGISTRATIONS
+echo WINFSP DLL
 reg query HKLM\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order
 reg query HKLM\SYSTEM\CurrentControlSet\Services\WinFsp.Np\NetworkProvider
 reg query HKLM\SYSTEM\CurrentControlSet\Services\EventLog\Application\WinFsp
 echo.
 
-echo WINFSP FSD CONFIGURATION AND STATUS
-sc query WinFsp
-sc qc WinFsp
-sc sdshow WinFsp
-echo.
-
-echo WINFSP LAUNCHER SERVICE CONFIGURATION AND STATUS
+echo WINFSP LAUNCHER
 sc query WinFsp.Launcher
 sc qc WinFsp.Launcher
 sc sdshow WinFsp.Launcher
 echo.
+echo.
+
+echo WINFSP REGISTRY
+reg query HKLM\SOFTWARE\WinFsp /s /reg:32
+echo.
+
+echo FILE SYSTEM FILTERS (REQUIRES ADMINISTRATOR)
+fltmc filters
+echo.
+echo.
 
 echo OS INFORMATION
 systeminfo

tools/gensrc/remove-build-dotnet.bat

@@ -0,0 +1,17 @@
+@echo off
+
+setlocal
+setlocal EnableDelayedExpansion
+
+if "%1"=="" (
+    cd %~dp0..\..
+) else (
+    cd "%1"
+)
+
+
+if exist winfsp.sln (
+    powershell -NoProfile -ExecutionPolicy Bypass -Command "& '%~dp0remove-sln-project.ps1' -Path '%cd%\winfsp.sln' -Match '*dotnet*'
+) else (
+    echo winfsp.sln not found in %cd%
+)

tools/gensrc/remove-sln-project.ps1

@@ -0,0 +1,12 @@
+param (
+    [Parameter(Mandatory)][string]$Path,
+    [Parameter(Mandatory)][string]$Match
+)
+
+echo "Removing projects that match $($Match) from $($Path)"
+
+Get-Content $Path -Delimiter 'EndProject' |
+  Where-Object {$_ -notlike $Match} |
+  Set-Content "$($Path).new"
+  
+ Move-Item -Path "$($Path).new" -Destination $Path -Force

tools/make-release.ps1

@@ -161,9 +161,15 @@ function Check-Assets {
         exit 1
     }
 
+    # check winfsp.net.nupkg
+    if (!(Test-Path "$ProjectRoot\build\VStudio\build\Release\winfsp.net.*.nupkg" -ErrorAction SilentlyContinue)) {
+        Write-Stderr "error: cannot find winfsp.net.*.nupkg"
+        exit 1
+    }
+
     # check winfsp.nupkg
-    if (!(Test-Path "$ProjectRoot\build\VStudio\build\Release\winfsp*.nupkg" -ErrorAction SilentlyContinue)) {
-        Write-Stderr "error: cannot find winfsp*.nupkg"
+    if (!(Test-Path "$ProjectRoot\build\VStudio\build\Release\winfsp.*.nupkg" -ErrorAction SilentlyContinue)) {
+        Write-Stderr "error: cannot find winfsp.*.nupkg"
         exit 1
     }
 
@@ -231,10 +237,6 @@ function Make-GitHubRelease {
     Task -ScriptBlock {
         Check-Assets
 
-        if ((Resolve-Path "$ProjectRoot\build\VStudio\build\Release\winfsp*.msi") -match "\\winfsp-(.+)\.msi") {
-            $Version = $matches[1]
-        }
-
         $DownloadColor = "blue"
         $PrereleaseOpt = ""
         if ($ReleaseInfo.Prerelease) {
@@ -242,16 +244,34 @@ function Make-GitHubRelease {
             $PrereleaseOpt = "-p"
         }
 
-        $ReleaseNotes = @"
-[![Download WinFsp](https://img.shields.io/badge/-Download%20WinFsp-$DownloadColor.svg?style=for-the-badge&labelColor=grey&logo=data:image/svg%2bxml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA0ODAgNDgwIj48cGF0aCBkPSJNMzg3LjAwMiAyMDEuMDAxQzM3Mi45OTggMTMyLjAwMiAzMTIuOTk4IDgwIDI0MCA4MGMtNTcuOTk4IDAtMTA3Ljk5OCAzMi45OTgtMTMyLjk5OCA4MS4wMDFDNDcuMDAyIDE2Ny4wMDIgMCAyMTcuOTk4IDAgMjgwYzAgNjUuOTk2IDUzLjk5OSAxMjAgMTIwIDEyMGgyNjBjNTUgMCAxMDAtNDUgMTAwLTEwMCAwLTUyLjk5OC00MC45OTYtOTYuMDAxLTkyLjk5OC05OC45OTl6TTIwOCAyNTJ2LTc2aDY0djc2aDY4TDI0MCAzNTIgMTQwIDI1Mmg2OHoiIGZpbGw9IiNmZmYiLz48L3N2Zz4=)](https://github.com/billziss-gh/winfsp/releases/download/$($ReleaseInfo.Tag)/winfsp-$Version.msi)
+        $MsiFile = Resolve-Path "$ProjectRoot\build\VStudio\build\Release\winfsp*.msi"
+        $ZipFile = Resolve-Path "$ProjectRoot\build\VStudio\build\Release\winfsp-tests*.zip"
+        $MsiName = Split-Path -Leaf $MsiFile
+        $ZipName = Split-Path -Leaf $ZipFile
+        $MsiHash = (Get-FileHash -Algorithm SHA256 $MsiFile).Hash
+        $ZipHash = (Get-FileHash -Algorithm SHA256 $ZipFile).Hash
 
-[VirusTotal Scan Results]()
+        if ($MsiName -match "winfsp-(.+)\.msi") {
+            $Version = $matches[1]
+        }
+
+        $ReleaseNotes = @"
+[![Download WinFsp](https://img.shields.io/badge/-Download%20WinFsp-$DownloadColor.svg?style=for-the-badge&labelColor=grey&logo=data:image/svg%2bxml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA0ODAgNDgwIj48cGF0aCBkPSJNMzg3LjAwMiAyMDEuMDAxQzM3Mi45OTggMTMyLjAwMiAzMTIuOTk4IDgwIDI0MCA4MGMtNTcuOTk4IDAtMTA3Ljk5OCAzMi45OTgtMTMyLjk5OCA4MS4wMDFDNDcuMDAyIDE2Ny4wMDIgMCAyMTcuOTk4IDAgMjgwYzAgNjUuOTk2IDUzLjk5OSAxMjAgMTIwIDEyMGgyNjBjNTUgMCAxMDAtNDUgMTAwLTEwMCAwLTUyLjk5OC00MC45OTYtOTYuMDAxLTkyLjk5OC05OC45OTl6TTIwOCAyNTJ2LTc2aDY0djc2aDY4TDI0MCAzNTIgMTQwIDI1Mmg2OHoiIGZpbGw9IiNmZmYiLz48L3N2Zz4=)](https://github.com/winfsp/winfsp/releases/download/$($ReleaseInfo.Tag)/winfsp-$Version.msi)
 
 ## CHANGES SINCE WINFSP $($ReleaseInfo.PreviousProductVersion)
 $($ReleaseInfo.Text -join "`n")
+<details>
+<summary>
+<b>BUILD HASHES (SHA256)</b>
+<p/>
+</summary>
+
+- **``$MsiName``**: $MsiHash
+- **``$ZipName``**: $ZipHash
+</details>
 "@
 
-        gh release create $ReleaseInfo.Tag --draft --title "WinFsp $($ReleaseInfo.ProductVersion)" --notes "$ReleaseNotes" $PrereleaseOpt (Resolve-Path "$ProjectRoot\build\VStudio\build\Release\winfsp*.msi") (Resolve-Path "$ProjectRoot\build\VStudio\build\Release\winfsp-tests*.zip")
+        gh release create $ReleaseInfo.Tag --draft --title "WinFsp $($ReleaseInfo.ProductVersion)" --notes "$ReleaseNotes" $PrereleaseOpt $MsiFile $ZipFile
         if ($LastExitCode -ne 0) {
             Write-Stderr "error: cannot create GitHub release"
             exit 1
@@ -305,12 +325,32 @@ Push the winfsp.sym repository to GitHub.
     }
 }
 
+function Make-NugetRelease {
+    Task -ScriptBlock {
+        Check-Assets
+
+        Push-Location "$ProjectRoot\build\VStudio\build\Release"
+        nuget push (Resolve-Path winfsp.net.[0-9]*.nupkg) -Source https://api.nuget.org/v3/index.json
+        if ($LastExitCode -ne 0) {
+            Write-Stderr "error: cannot push to Nuget"
+            exit 1
+        }
+        Pop-Location
+
+        Write-Stdout @"
+
+Nuget release for $($ReleaseInfo.Tag) has been pushed.
+
+"@
+    }
+}
+
 function Make-ChocoRelease {
     Task -ScriptBlock {
         Check-Assets
 
         Push-Location "$ProjectRoot\build\VStudio\build\Release"
-        choco push
+        choco push (Resolve-Path winfsp.[0-9]*.nupkg)
         if ($LastExitCode -ne 0) {
             Write-Stderr "error: cannot push to Chocolatey"
             exit 1
@@ -338,4 +378,5 @@ Build-AssetsPhase1
 Build-AssetsPhase2
 Make-GitHubRelease
 Upload-Symbols
+Make-NugetRelease
 Make-ChocoRelease

tools/sxsident.bat

@@ -0,0 +1,24 @@
+@echo off
+
+setlocal
+setlocal EnableDelayedExpansion
+
+set SxsDir=
+set RegKey="HKLM\SOFTWARE\WinFsp"
+set RegVal="SxsDir"
+reg query !RegKey! /v !RegVal! /reg:32 >nul 2>&1
+if !ERRORLEVEL! equ 0 (
+    for /f "tokens=2,*" %%i in ('reg query !RegKey! /v !RegVal! /reg:32 ^| findstr !RegVal!') do (
+        set SxsDir=%%j
+    )
+)
+if defined SxsDir (
+    set SxsDir=!SxsDir:*SxS\sxs.=!
+    if !SxsDir:~-1!==\ set SxsDir=!SxsDir:~0,-1!
+    echo !SxsDir!
+)
+
+exit /b 0
+
+:fail
+exit /b 1

tst/memfs/memfs.cpp

@@ -40,6 +40,11 @@ FSP_FSCTL_STATIC_ASSERT(MEMFS_MAX_PATH > MAX_PATH,
  */
 //#define MEMFS_STANDALONE
 
+/*
+ * Define the MEMFS_DISPATCHER_STOPPED macro to include DispatcherStopped support.
+ */
+#define MEMFS_DISPATCHER_STOPPED
+
 /*
  * Define the MEMFS_NAME_NORMALIZATION macro to include name normalization support.
  */
@@ -2269,6 +2274,14 @@ static NTSTATUS SetEa(FSP_FILE_SYSTEM *FileSystem,
 }
 #endif
 
+#if defined(MEMFS_DISPATCHER_STOPPED)
+static VOID DispatcherStopped(FSP_FILE_SYSTEM *FileSystem,
+    BOOLEAN Normally)
+{
+    FspFileSystemStopServiceIfNecessary(FileSystem, Normally);
+}
+#endif
+
 static FSP_FILE_SYSTEM_INTERFACE MemfsInterface =
 {
     GetVolumeInfo,
@@ -2336,6 +2349,12 @@ static FSP_FILE_SYSTEM_INTERFACE MemfsInterface =
     0,
     0,
     0,
+#endif
+    0,
+#if defined(MEMFS_DISPATCHER_STOPPED)
+    DispatcherStopped,
+#else
+    0,
 #endif
 };
 

tst/ntptfs/ptfs.c

@@ -1143,6 +1143,12 @@ exit:
     return Result;
 }
 
+static VOID DispatcherStopped(FSP_FILE_SYSTEM *FileSystem,
+    BOOLEAN Normally)
+{
+    FspFileSystemStopServiceIfNecessary(FileSystem, Normally);
+}
+
 static FSP_FILE_SYSTEM_INTERFACE PtfsInterface =
 {
     .GetVolumeInfo = GetVolumeInfo,
@@ -1171,6 +1177,7 @@ static FSP_FILE_SYSTEM_INTERFACE PtfsInterface =
     .GetStreamInfo = GetStreamInfo,
     .GetEa = GetEa,
     .SetEa = SetEa,
+    .DispatcherStopped = DispatcherStopped,
 };
 
 NTSTATUS PtfsCreate(

tst/passthrough-fuse/passthrough-fuse.c

@@ -52,7 +52,7 @@
 #define fi_setdirp(fi, dirp)            (fi_setfh(fi, dirp, fi_dirbit))
 
 #define ptfs_impl_fullpath(n)           \
-    char full ## n[PATH_MAX];           \
+    char full ## n[PATH_MAX * 4];       \
     if (!concat_path(((PTFS *)fuse_get_context()->private_data), n, full ## n))\
         return -ENAMETOOLONG;           \
     n = full ## n

tst/passthrough-fuse/winposix.c

@@ -129,15 +129,50 @@ char *realpath(const char *path, char *resolved)
         result = resolved;
 
     int err = 0;
-    DWORD len = GetFullPathNameA(path, PATH_MAX, result, 0);
+    WCHAR PathBuf[PATH_MAX];
+    WCHAR ResultBuf[PATH_MAX];
+    PWSTR ResultBufBgn = &ResultBuf[6];
+    if (0 == MultiByteToWideChar(CP_UTF8, 0, path, -1, PathBuf, PATH_MAX))
+        err = GetLastError();
+    else
+    {
+        DWORD len = GetFullPathNameW(PathBuf, PATH_MAX - 6, ResultBufBgn, 0);
         if (0 == len)
             err = GetLastError();
-    else if (PATH_MAX < len)
+        else if (PATH_MAX - 6 < len)
             err = ERROR_INVALID_PARAMETER;
+        else
+        {
+            if (0 == WideCharToMultiByte(CP_UTF8, 0, ResultBufBgn, -1, result, PATH_MAX, 0, 0))
+                err = GetLastError();
+            else
+            {
+                if (L'\\' == ResultBufBgn[0] && L'\\' == ResultBufBgn[1])
+                {
+                    ResultBufBgn = ResultBuf;
+                    ResultBufBgn[0] = L'\\';
+                    ResultBufBgn[1] = L'\\';
+                    ResultBufBgn[2] = L'?';
+                    ResultBufBgn[3] = L'\\';
+                    ResultBufBgn[4] = L'U';
+                    ResultBufBgn[5] = L'N';
+                    ResultBufBgn[6] = L'C';
+                }
+                else
+                {
+                    ResultBufBgn = &ResultBuf[2];
+                    ResultBufBgn[0] = L'\\';
+                    ResultBufBgn[1] = L'\\';
+                    ResultBufBgn[2] = L'?';
+                    ResultBufBgn[3] = L'\\';
+                }
+            }
+        }
+    }
 
     if (0 == err)
     {
-        HANDLE h = CreateFileA(result,
+        HANDLE h = CreateFileW(ResultBufBgn,
             FILE_READ_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
             0,
             OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -155,13 +190,71 @@ char *realpath(const char *path, char *resolved)
         errno = maperror(err);
         result = 0;
     }
-
     return result;
 }
 
+static int uncpath(const char *path, WCHAR *buf, int nchar)
+{
+    PWSTR BufP = 0;
+    if ('\\' == path[0] && '\\' == path[1])
+    {
+        if (8 < nchar &&
+            0 < MultiByteToWideChar(CP_UTF8, 0, &path[2], -1, &buf[8], nchar - 8))
+        {
+            BufP = &buf[8];
+            buf[0] = L'\\';
+            buf[1] = L'\\';
+            buf[2] = L'?';
+            buf[3] = L'\\';
+            buf[4] = L'U';
+            buf[5] = L'N';
+            buf[6] = L'C';
+            buf[7] = L'\\';
+        }
+    }
+    else
+    {
+        if (4 < nchar &&
+            0 < MultiByteToWideChar(CP_UTF8, 0, path, -1, &buf[4], nchar - 4))
+        {
+            BufP = &buf[4];
+            buf[0] = L'\\';
+            buf[1] = L'\\';
+            buf[2] = L'?';
+            buf[3] = L'\\';
+        }
+    }
+
+    if (0 == BufP)
+    {
+        if (0 < nchar)
+            buf[0] = 0;
+        return 0;
+    }
+
+    PWSTR P = BufP;
+    while (*BufP)
+    {
+        if (L'/' == *BufP || L'\\' == *BufP)
+        {
+            while (L'/' == BufP[1] || L'\\' == BufP[1])
+                BufP++;
+        }
+        if (L'/' == *BufP)
+            *P = L'\\';
+        else if (P != BufP)
+            *P = *BufP;
+        BufP++;
+        P++;
+    }
+    if (P != BufP)
+        *P = 0;
+    return 1;
+}
+
 int statvfs(const char *path, struct fuse_statvfs *stbuf)
 {
-    char root[PATH_MAX];
+    WCHAR root[PATH_MAX];
     DWORD
         VolumeSerialNumber,
         MaxComponentLength,
@@ -170,9 +263,11 @@ int statvfs(const char *path, struct fuse_statvfs *stbuf)
         NumberOfFreeClusters,
         TotalNumberOfClusters;
 
-    if (!GetVolumePathNameA(path, root, PATH_MAX) ||
-        !GetVolumeInformationA(root, 0, 0, &VolumeSerialNumber, &MaxComponentLength, 0, 0, 0) ||
-        !GetDiskFreeSpaceA(root, &SectorsPerCluster, &BytesPerSector,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!GetVolumePathNameW(PathBuf, root, PATH_MAX) ||
+        !GetVolumeInformationW(root, 0, 0, &VolumeSerialNumber, &MaxComponentLength, 0, 0, 0) ||
+        !GetDiskFreeSpaceW(root, &SectorsPerCluster, &BytesPerSector,
             &NumberOfFreeClusters, &TotalNumberOfClusters))
     {
         return error();
@@ -201,7 +296,9 @@ int open(const char *path, int oflag, ...)
         CREATE_NEW :
         cd[(oflag & (_O_CREAT | _O_TRUNC)) >> 8];
 
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         DesiredAccess, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0/* default security */,
         CreationDisposition, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -325,7 +422,9 @@ int close(int fd)
 
 int getpath(const char *path, char *buf, size_t size)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_READ_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -341,7 +440,9 @@ int getpath(const char *path, char *buf, size_t size)
 
 int lstat(const char *path, struct fuse_stat *stbuf)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_READ_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -375,7 +476,9 @@ int lchflags(const char *path, uint32_t flags)
     if (0 == FileAttributes)
         FileAttributes = FILE_ATTRIBUTE_NORMAL;
 
-    if (!SetFileAttributesA(path, FileAttributes))
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!SetFileAttributesW(PathBuf, FileAttributes))
         return error();
 #endif
 
@@ -384,7 +487,9 @@ int lchflags(const char *path, uint32_t flags)
 
 int truncate(const char *path, fuse_off_t size)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_WRITE_DATA, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -418,7 +523,9 @@ int utimensat(int dirfd, const char *path, const struct fuse_timespec times[2],
     /* ignore dirfd and assume that it is always AT_FDCWD */
     /* ignore flag and assume that it is always AT_SYMLINK_NOFOLLOW */
 
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_WRITE_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -448,7 +555,9 @@ int utimensat(int dirfd, const char *path, const struct fuse_timespec times[2],
 
 int setcrtime(const char *path, const struct fuse_timespec *tv)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_WRITE_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -468,7 +577,9 @@ int setcrtime(const char *path, const struct fuse_timespec *tv)
 
 int unlink(const char *path)
 {
-    if (!DeleteFileA(path))
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!DeleteFileW(PathBuf))
         return error();
 
     return 0;
@@ -476,7 +587,11 @@ int unlink(const char *path)
 
 int rename(const char *oldpath, const char *newpath)
 {
-    if (!MoveFileExA(oldpath, newpath, MOVEFILE_REPLACE_EXISTING))
+    WCHAR OldPathBuf[PATH_MAX];
+    WCHAR NewPathBuf[PATH_MAX];
+    uncpath(oldpath, OldPathBuf, PATH_MAX);
+    uncpath(newpath, NewPathBuf, PATH_MAX);
+    if (!MoveFileExW(OldPathBuf, NewPathBuf, MOVEFILE_REPLACE_EXISTING))
         return error();
 
     return 0;
@@ -484,7 +599,9 @@ int rename(const char *oldpath, const char *newpath)
 
 static int lsetea(const char *path, PFILE_FULL_EA_INFORMATION Ea, ULONG EaLength)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_WRITE_EA | SYNCHRONIZE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -519,7 +636,9 @@ static int lgetea(const char *path,
     PFILE_GET_EA_INFORMATION GetEa, ULONG GetEaLength,
     PFILE_FULL_EA_INFORMATION Ea, ULONG EaLength)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_READ_EA | SYNCHRONIZE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -711,7 +830,9 @@ int lremovexattr(const char *path, const char *name)
 
 int mkdir(const char *path, fuse_mode_t mode)
 {
-    if (!CreateDirectoryA(path, 0/* default security */))
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!CreateDirectoryW(PathBuf, 0/* default security */))
         return error();
 
     return 0;
@@ -719,7 +840,9 @@ int mkdir(const char *path, fuse_mode_t mode)
 
 int rmdir(const char *path)
 {
-    if (!RemoveDirectoryA(path))
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!RemoveDirectoryW(PathBuf))
         return error();
 
     return 0;
@@ -727,7 +850,9 @@ int rmdir(const char *path)
 
 DIR *opendir(const char *path)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_READ_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -772,18 +897,20 @@ void rewinddir(DIR *dirp)
 
 struct dirent *readdir(DIR *dirp)
 {
-    WIN32_FIND_DATAA FindData;
+    WIN32_FIND_DATAW FindData;
     struct fuse_stat *stbuf = &dirp->de.d_stat;
 
     if (INVALID_HANDLE_VALUE == dirp->fh)
     {
-        dirp->fh = FindFirstFileA(dirp->path, &FindData);
+        WCHAR PathBuf[PATH_MAX];
+        uncpath(dirp->path, PathBuf, PATH_MAX);
+        dirp->fh = FindFirstFileW(PathBuf, &FindData);
         if (INVALID_HANDLE_VALUE == dirp->fh)
             return error0();
     }
     else
     {
-        if (!FindNextFileA(dirp->fh, &FindData))
+        if (!FindNextFileW(dirp->fh, &FindData))
         {
             if (ERROR_NO_MORE_FILES == GetLastError())
                 return 0;
@@ -804,7 +931,7 @@ struct dirent *readdir(DIR *dirp)
     stbuf->st_flags = MapFileAttributesToFlags(FindData.dwFileAttributes);
 #endif
 
-    strcpy(dirp->de.d_name, FindData.cFileName);
+    WideCharToMultiByte(CP_UTF8, 0, FindData.cFileName, -1, dirp->de.d_name, 255 * 4, 0, 0);
 
     return &dirp->de;
 }

tst/passthrough-fuse/winposix.h

@@ -38,7 +38,7 @@ typedef struct _DIR DIR;
 struct dirent
 {
     struct fuse_stat d_stat;
-    char d_name[255];
+    char d_name[255 * 4];
 };
 
 char *realpath(const char *path, char *resolved);

tst/passthrough-fuse3/passthrough-fuse3.c

@@ -49,7 +49,7 @@
 #define fi_setdirp(fi, dirp)            (fi_setfh(fi, dirp, fi_dirbit))
 
 #define ptfs_impl_fullpath(n)           \
-    char full ## n[PATH_MAX];           \
+    char full ## n[PATH_MAX * 4];           \
     if (!concat_path(((PTFS *)fuse_get_context()->private_data), n, full ## n))\
         return -ENAMETOOLONG;           \
     n = full ## n

tst/passthrough-fuse3/winposix.c

@@ -129,15 +129,50 @@ char *realpath(const char *path, char *resolved)
         result = resolved;
 
     int err = 0;
-    DWORD len = GetFullPathNameA(path, PATH_MAX, result, 0);
+    WCHAR PathBuf[PATH_MAX];
+    WCHAR ResultBuf[PATH_MAX];
+    PWSTR ResultBufBgn = &ResultBuf[6];
+    if (0 == MultiByteToWideChar(CP_UTF8, 0, path, -1, PathBuf, PATH_MAX))
+        err = GetLastError();
+    else
+    {
+        DWORD len = GetFullPathNameW(PathBuf, PATH_MAX - 6, ResultBufBgn, 0);
         if (0 == len)
             err = GetLastError();
-    else if (PATH_MAX < len)
+        else if (PATH_MAX - 6 < len)
             err = ERROR_INVALID_PARAMETER;
+        else
+        {
+            if (0 == WideCharToMultiByte(CP_UTF8, 0, ResultBufBgn, -1, result, PATH_MAX, 0, 0))
+                err = GetLastError();
+            else
+            {
+                if (L'\\' == ResultBufBgn[0] && L'\\' == ResultBufBgn[1])
+                {
+                    ResultBufBgn = ResultBuf;
+                    ResultBufBgn[0] = L'\\';
+                    ResultBufBgn[1] = L'\\';
+                    ResultBufBgn[2] = L'?';
+                    ResultBufBgn[3] = L'\\';
+                    ResultBufBgn[4] = L'U';
+                    ResultBufBgn[5] = L'N';
+                    ResultBufBgn[6] = L'C';
+                }
+                else
+                {
+                    ResultBufBgn = &ResultBuf[2];
+                    ResultBufBgn[0] = L'\\';
+                    ResultBufBgn[1] = L'\\';
+                    ResultBufBgn[2] = L'?';
+                    ResultBufBgn[3] = L'\\';
+                }
+            }
+        }
+    }
 
     if (0 == err)
     {
-        HANDLE h = CreateFileA(result,
+        HANDLE h = CreateFileW(ResultBufBgn,
             FILE_READ_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
             0,
             OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -155,13 +190,71 @@ char *realpath(const char *path, char *resolved)
         errno = maperror(err);
         result = 0;
     }
-
     return result;
 }
 
+static int uncpath(const char *path, WCHAR *buf, int nchar)
+{
+    PWSTR BufP = 0;
+    if ('\\' == path[0] && '\\' == path[1])
+    {
+        if (8 < nchar &&
+            0 < MultiByteToWideChar(CP_UTF8, 0, &path[2], -1, &buf[8], nchar - 8))
+        {
+            BufP = &buf[8];
+            buf[0] = L'\\';
+            buf[1] = L'\\';
+            buf[2] = L'?';
+            buf[3] = L'\\';
+            buf[4] = L'U';
+            buf[5] = L'N';
+            buf[6] = L'C';
+            buf[7] = L'\\';
+        }
+    }
+    else
+    {
+        if (4 < nchar &&
+            0 < MultiByteToWideChar(CP_UTF8, 0, path, -1, &buf[4], nchar - 4))
+        {
+            BufP = &buf[4];
+            buf[0] = L'\\';
+            buf[1] = L'\\';
+            buf[2] = L'?';
+            buf[3] = L'\\';
+        }
+    }
+
+    if (0 == BufP)
+    {
+        if (0 < nchar)
+            buf[0] = 0;
+        return 0;
+    }
+
+    PWSTR P = BufP;
+    while (*BufP)
+    {
+        if (L'/' == *BufP || L'\\' == *BufP)
+        {
+            while (L'/' == BufP[1] || L'\\' == BufP[1])
+                BufP++;
+        }
+        if (L'/' == *BufP)
+            *P = L'\\';
+        else if (P != BufP)
+            *P = *BufP;
+        BufP++;
+        P++;
+    }
+    if (P != BufP)
+        *P = 0;
+    return 1;
+}
+
 int statvfs(const char *path, struct fuse_statvfs *stbuf)
 {
-    char root[PATH_MAX];
+    WCHAR root[PATH_MAX];
     DWORD
         VolumeSerialNumber,
         MaxComponentLength,
@@ -170,9 +263,11 @@ int statvfs(const char *path, struct fuse_statvfs *stbuf)
         NumberOfFreeClusters,
         TotalNumberOfClusters;
 
-    if (!GetVolumePathNameA(path, root, PATH_MAX) ||
-        !GetVolumeInformationA(root, 0, 0, &VolumeSerialNumber, &MaxComponentLength, 0, 0, 0) ||
-        !GetDiskFreeSpaceA(root, &SectorsPerCluster, &BytesPerSector,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!GetVolumePathNameW(PathBuf, root, PATH_MAX) ||
+        !GetVolumeInformationW(root, 0, 0, &VolumeSerialNumber, &MaxComponentLength, 0, 0, 0) ||
+        !GetDiskFreeSpaceW(root, &SectorsPerCluster, &BytesPerSector,
             &NumberOfFreeClusters, &TotalNumberOfClusters))
     {
         return error();
@@ -201,7 +296,9 @@ int open(const char *path, int oflag, ...)
         CREATE_NEW :
         cd[(oflag & (_O_CREAT | _O_TRUNC)) >> 8];
 
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         DesiredAccess, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0/* default security */,
         CreationDisposition, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -305,7 +402,9 @@ int close(int fd)
 
 int lstat(const char *path, struct fuse_stat *stbuf)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_READ_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -339,7 +438,9 @@ int lchflags(const char *path, uint32_t flags)
     if (0 == FileAttributes)
         FileAttributes = FILE_ATTRIBUTE_NORMAL;
 
-    if (!SetFileAttributesA(path, FileAttributes))
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!SetFileAttributesW(PathBuf, FileAttributes))
         return error();
 #endif
 
@@ -348,7 +449,9 @@ int lchflags(const char *path, uint32_t flags)
 
 int truncate(const char *path, fuse_off_t size)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_WRITE_DATA, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -382,7 +485,9 @@ int utimensat(int dirfd, const char *path, const struct fuse_timespec times[2],
     /* ignore dirfd and assume that it is always AT_FDCWD */
     /* ignore flag and assume that it is always AT_SYMLINK_NOFOLLOW */
 
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_WRITE_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -412,7 +517,9 @@ int utimensat(int dirfd, const char *path, const struct fuse_timespec times[2],
 
 int setcrtime(const char *path, const struct fuse_timespec *tv)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_WRITE_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -432,7 +539,9 @@ int setcrtime(const char *path, const struct fuse_timespec *tv)
 
 int unlink(const char *path)
 {
-    if (!DeleteFileA(path))
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!DeleteFileW(PathBuf))
         return error();
 
     return 0;
@@ -440,7 +549,11 @@ int unlink(const char *path)
 
 int rename(const char *oldpath, const char *newpath)
 {
-    if (!MoveFileExA(oldpath, newpath, MOVEFILE_REPLACE_EXISTING))
+    WCHAR OldPathBuf[PATH_MAX];
+    WCHAR NewPathBuf[PATH_MAX];
+    uncpath(oldpath, OldPathBuf, PATH_MAX);
+    uncpath(newpath, NewPathBuf, PATH_MAX);
+    if (!MoveFileExW(OldPathBuf, NewPathBuf, MOVEFILE_REPLACE_EXISTING))
         return error();
 
     return 0;
@@ -448,7 +561,9 @@ int rename(const char *oldpath, const char *newpath)
 
 static int lsetea(const char *path, PFILE_FULL_EA_INFORMATION Ea, ULONG EaLength)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_WRITE_EA | SYNCHRONIZE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -483,7 +598,9 @@ static int lgetea(const char *path,
     PFILE_GET_EA_INFORMATION GetEa, ULONG GetEaLength,
     PFILE_FULL_EA_INFORMATION Ea, ULONG EaLength)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_READ_EA | SYNCHRONIZE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -675,7 +792,9 @@ int lremovexattr(const char *path, const char *name)
 
 int mkdir(const char *path, fuse_mode_t mode)
 {
-    if (!CreateDirectoryA(path, 0/* default security */))
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!CreateDirectoryW(PathBuf, 0/* default security */))
         return error();
 
     return 0;
@@ -683,7 +802,9 @@ int mkdir(const char *path, fuse_mode_t mode)
 
 int rmdir(const char *path)
 {
-    if (!RemoveDirectoryA(path))
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    if (!RemoveDirectoryW(PathBuf))
         return error();
 
     return 0;
@@ -691,7 +812,9 @@ int rmdir(const char *path)
 
 DIR *opendir(const char *path)
 {
-    HANDLE h = CreateFileA(path,
+    WCHAR PathBuf[PATH_MAX];
+    uncpath(path, PathBuf, PATH_MAX);
+    HANDLE h = CreateFileW(PathBuf,
         FILE_READ_ATTRIBUTES, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
         0,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
@@ -736,18 +859,20 @@ void rewinddir(DIR *dirp)
 
 struct dirent *readdir(DIR *dirp)
 {
-    WIN32_FIND_DATAA FindData;
+    WIN32_FIND_DATAW FindData;
     struct fuse_stat *stbuf = &dirp->de.d_stat;
 
     if (INVALID_HANDLE_VALUE == dirp->fh)
     {
-        dirp->fh = FindFirstFileA(dirp->path, &FindData);
+        WCHAR PathBuf[PATH_MAX];
+        uncpath(dirp->path, PathBuf, PATH_MAX);
+        dirp->fh = FindFirstFileW(PathBuf, &FindData);
         if (INVALID_HANDLE_VALUE == dirp->fh)
             return error0();
     }
     else
     {
-        if (!FindNextFileA(dirp->fh, &FindData))
+        if (!FindNextFileW(dirp->fh, &FindData))
         {
             if (ERROR_NO_MORE_FILES == GetLastError())
                 return 0;
@@ -768,7 +893,7 @@ struct dirent *readdir(DIR *dirp)
     stbuf->st_flags = MapFileAttributesToFlags(FindData.dwFileAttributes);
 #endif
 
-    strcpy(dirp->de.d_name, FindData.cFileName);
+    WideCharToMultiByte(CP_UTF8, 0, FindData.cFileName, -1, dirp->de.d_name, 255 * 4, 0, 0);
 
     return &dirp->de;
 }

tst/passthrough-fuse3/winposix.h

@@ -38,7 +38,7 @@ typedef struct _DIR DIR;
 struct dirent
 {
     struct fuse_stat d_stat;
-    char d_name[255];
+    char d_name[255 * 4];
 };
 
 char *realpath(const char *path, char *resolved);

tst/winfsp-tests/create-test.c

@@ -1287,6 +1287,38 @@ void create_namelen_dotest(ULONG Flags, PWSTR Prefix, PWSTR Drive)
     ASSERT(INVALID_HANDLE_VALUE == Handle);
     ASSERT(ERROR_INVALID_NAME == GetLastError());
 
+    for (P = FilePathBgn, EndP = P + MaxComponentLength - 1; EndP > P; P++)
+        *P = (P - FilePathBgn) % 10 + 0x3041;
+    *P = L'\0';
+
+    Handle = CreateFileW(FilePath,
+        GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
+        CREATE_NEW, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, 0);
+    ASSERT(INVALID_HANDLE_VALUE != Handle);
+    Success = CloseHandle(Handle);
+    ASSERT(Success);
+
+    for (P = FilePathBgn, EndP = P + MaxComponentLength; EndP > P; P++)
+        *P = (P - FilePathBgn) % 10 + 0x3041;
+    *P = L'\0';
+
+    Handle = CreateFileW(FilePath,
+        GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
+        CREATE_NEW, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, 0);
+    ASSERT(INVALID_HANDLE_VALUE != Handle);
+    Success = CloseHandle(Handle);
+    ASSERT(Success);
+
+    for (P = FilePathBgn, EndP = P + MaxComponentLength + 1; EndP > P; P++)
+        *P = (P - FilePathBgn) % 10 + 0x3041;
+    *P = L'\0';
+
+    Handle = CreateFileW(FilePath,
+        GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
+        CREATE_NEW, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, 0);
+    ASSERT(INVALID_HANDLE_VALUE == Handle);
+    ASSERT(ERROR_INVALID_NAME == GetLastError());
+
     memfs_stop(memfs);
 }
 

tst/winfsp-tests/dirctl-test.c

@@ -576,6 +576,40 @@ static void querydir_namelen_dotest(ULONG Flags, PWSTR Prefix, PWSTR Drive)
     ASSERT(INVALID_HANDLE_VALUE == Handle);
     ASSERT(ERROR_INVALID_NAME == GetLastError());
 
+    for (P = FilePathBgn, EndP = P + MaxComponentLength - 1; EndP > P; P++)
+        *P = (P - FilePathBgn) % 10 + 0x3041;
+    *P = L'\0';
+
+    Handle = CreateFileW(FilePath,
+        GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
+        CREATE_NEW, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, 0);
+    ASSERT(INVALID_HANDLE_VALUE != Handle);
+    querydir_namelen_exists(FilePath);
+    Success = CloseHandle(Handle);
+    ASSERT(Success);
+
+    for (P = FilePathBgn, EndP = P + MaxComponentLength; EndP > P; P++)
+        *P = (P - FilePathBgn) % 10 + 0x3041;
+    *P = L'\0';
+
+    Handle = CreateFileW(FilePath,
+        GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
+        CREATE_NEW, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, 0);
+    ASSERT(INVALID_HANDLE_VALUE != Handle);
+    querydir_namelen_exists(FilePath);
+    Success = CloseHandle(Handle);
+    ASSERT(Success);
+
+    for (P = FilePathBgn, EndP = P + MaxComponentLength + 1; EndP > P; P++)
+        *P = (P - FilePathBgn) % 10 + 0x3041;
+    *P = L'\0';
+
+    Handle = CreateFileW(FilePath,
+        GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0,
+        CREATE_NEW, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, 0);
+    ASSERT(INVALID_HANDLE_VALUE == Handle);
+    ASSERT(ERROR_INVALID_NAME == GetLastError());
+
     memfs_stop(memfs);
 }
 

tst/winfsp-tests/loadun-test.c

@@ -0,0 +1,48 @@
+/**
+ * @file loadun-test.c
+ *
+ * @copyright 2015-2022 Bill Zissimopoulos
+ */
+/*
+ * This file is part of WinFsp.
+ *
+ * You can redistribute it and/or modify it under the terms of the GNU
+ * General Public License version 3 as published by the Free Software
+ * Foundation.
+ *
+ * Licensees holding a valid commercial license may use this software
+ * in accordance with the commercial license agreement provided in
+ * conjunction with the software.  The terms and conditions of any such
+ * commercial license agreement shall govern, supersede, and render
+ * ineffective any application of the GPLv3 license to this software,
+ * notwithstanding of any reference thereto in the software or
+ * associated repository.
+ */
+
+#include <winfsp/winfsp.h>
+#include <tlib/testsuite.h>
+
+#include "winfsp-tests.h"
+
+static void load_unload_test(void)
+{
+    /* this is not a real test! */
+
+    FspFsctlStartService();
+    FspFsctlStartService();
+
+    FspFsctlStopService();
+    FspFsctlStopService();
+}
+
+void load_unload_tests(void)
+{
+    if (OptExternal)
+        return;
+
+    /*
+     * An attempt to unload the driver while other tests are executing can make all tests fail.
+     * For this reason we do not enable this test, except when doing specialized testing.
+     */
+    //TEST_OPT(load_unload_test);
+}

tst/winfsp-tests/winfsp-tests.c

@@ -221,6 +221,7 @@ LONG WINAPI UnhandledExceptionHandler(struct _EXCEPTION_POINTERS *ExceptionInfo)
     argv[argc] = 0
 int main(int argc, char *argv[])
 {
+    TESTSUITE(load_unload_tests);
     TESTSUITE(fuse_opt_tests);
     TESTSUITE(fuse_tests);
     TESTSUITE(posix_tests);