Added FpsVersion as a static method in FileSystemHost

Added FlushAndPurgeOnCleanup

.gitignore

@@ -3,3 +3,4 @@
 ################################################################################
 
 *.db
+*.opendb

src/dotnet/FileSystemHost.cs

@@ -194,6 +194,11 @@ namespace Fsp
             get { return 0 != (_VolumeParams.Flags & VolumeParams.PassQueryDirectoryFileName); }
             set { _VolumeParams.Flags |= (value ? VolumeParams.PassQueryDirectoryFileName : 0); }
         }
+        public Boolean FlushAndPurgeOnCleanup
+        {
+            get { return 0 != (_VolumeParams.Flags & VolumeParams.FlushAndPurgeOnCleanup); }
+            set { _VolumeParams.Flags |= (value ? VolumeParams.FlushAndPurgeOnCleanup : 0); }
+        }
         /// <summary>
         /// Gets or sets the prefix for a network file system.
         /// </summary>
@@ -347,6 +352,14 @@ namespace Fsp
         {
             return Api.SetDebugLogFile(FileName);
         }
+        /// <summary>
+        /// Return the installed version for WinFSP
+        /// </summary>
+        /// <returns></returns>
+        public static Version GetFspVersion()
+        {
+            return Api.GetFspVersion();
+        }
 
         /* FSP_FILE_SYSTEM_INTERFACE */
         private static Byte[] ByteBufferNotNull = new Byte[0];

src/dotnet/Interop.cs

@@ -43,6 +43,7 @@ namespace Fsp.Interop
         internal const UInt32 PassQueryDirectoryPattern = 0x00000800;
         internal const UInt32 AlwaysUseDoubleBuffering = 0x00001000;
         internal const UInt32 PassQueryDirectoryFileName = 0x00002000;
+        internal const UInt32 FlushAndPurgeOnCleanup = 0x00004000;
         internal const UInt32 UmFileContextIsUserContext2 = 0x00010000;
         internal const UInt32 UmFileContextIsFullContext = 0x00020000;
         internal const int PrefixSize = 192;
@@ -979,6 +980,15 @@ namespace Fsp.Interop
             return 0/*STATUS_SUCCESS*/;
         }
 
+        internal static Version GetFspVersion()
+        {
+            UInt32 Version = 0, VersionMajor, VersionMinor;
+            FspVersion(out Version);
+            VersionMajor = Version >> 16;
+            VersionMinor = Version & 0xFFFF;
+            return new System.Version((Int32)VersionMajor, (Int32)VersionMinor);
+        }
+
         /* initialization */
         private static IntPtr LoadDll()
         {

tst/memfs-dotnet/Program.cs

@@ -255,6 +255,7 @@ namespace memfs
             Host.NamedStreams = true;
             Host.PostCleanupWhenModifiedOnly = true;
             Host.PassQueryDirectoryFileName = true;
+            Host.FlushAndPurgeOnCleanup = true;
             return STATUS_SUCCESS;
         }