dll,sys: FSP_CFG_REJECT_EARLY_IRP

Includes Avast fix for FUSE.

src/dll/fs.c

@@ -273,10 +273,12 @@ static DWORD WINAPI FspFileSystemDispatcherThread(PVOID FileSystem0)
     OperationContext.Response = Response;
     TlsSetValue(FspFileSystemTlsKey, &OperationContext);
 
+#if defined(FSP_CFG_REJECT_EARLY_IRP)
     Result = FspFsctlTransact(FileSystem->VolumeHandle, 0, 0, 0, 0, FALSE);
         /* send a Transact0 to inform the FSD that the dispatcher is ready */
     if (!NT_SUCCESS(Result))
         goto exit;
+#endif
 
     memset(Response, 0, sizeof *Response);
     for (;;)

src/dll/fuse/fuse.c

@@ -510,6 +510,9 @@ FSP_FUSE_API struct fuse *fsp_fuse_new(struct fsp_fuse_env *env,
     opt_data.VolumeParams.PostCleanupWhenModifiedOnly = TRUE;
     opt_data.VolumeParams.PassQueryDirectoryFileName = TRUE;
     opt_data.VolumeParams.DeviceControl = TRUE;
+#if defined(FSP_CFG_REJECT_EARLY_IRP)
+    opt_data.VolumeParams.RejectIrpPriorToTransact0 = TRUE;
+#endif
     opt_data.VolumeParams.UmFileContextIsUserContext2 = TRUE;
     if (L'\0' == opt_data.VolumeParams.FileSystemName[0])
         memcpy(opt_data.VolumeParams.FileSystemName, L"FUSE", 5 * sizeof(WCHAR));

src/dll/library.h

@@ -28,6 +28,8 @@
 #include <shared/minimal.h>
 #include <strsafe.h>
 
+#define FSP_CFG_REJECT_EARLY_IRP
+
 #define LIBRARY_NAME                    "WinFsp"
 
 /* DEBUGLOG */