From eb7f7847610f73d3ce76169c8b4603fe5a13addb Mon Sep 17 00:00:00 2001
From: Paul Gofman <pgofman@codeweavers.com>
Date: Fri, 29 May 2020 10:53:08 +0300
Subject: [PATCH] ntoskrnl.exe: Implement IoReuseIrp() function.

Signed-off-by: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/ntoskrnl.exe/ntoskrnl.c        | 11 +++++++++
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec |  2 +-
 dlls/ntoskrnl.exe/tests/driver.c    | 37 +++++++++++++++++++++++++++++
 include/ddk/wdm.h                   |  1 +
 4 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 3c8b207a4a3..e9c35cf7e31 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -975,6 +975,17 @@ void WINAPI IoInitializeIrp( IRP *irp, USHORT size, CCHAR stack_size )
             (PIO_STACK_LOCATION)(irp + 1) + stack_size;
 }
 
+void WINAPI IoReuseIrp(IRP *irp, NTSTATUS iostatus)
+{
+    UCHAR AllocationFlags;
+
+    TRACE("irp %p, iostatus %#x.\n", irp, iostatus);
+
+    AllocationFlags = irp->AllocationFlags;
+    IoInitializeIrp(irp, irp->Size, irp->StackCount);
+    irp->AllocationFlags = AllocationFlags;
+    irp->IoStatus.u.Status = iostatus;
+}
 
 /***********************************************************************
  *           IoInitializeTimer   (NTOSKRNL.EXE.@)
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index c4426566940..3b36a62269d 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -462,7 +462,7 @@
 @ stub IoReportTargetDeviceChange
 @ stub IoReportTargetDeviceChangeAsynchronous
 @ stub IoRequestDeviceEject
-@ stub IoReuseIrp
+@ stdcall IoReuseIrp(ptr long)
 @ stub IoSetCompletionRoutineEx
 @ stdcall IoSetDeviceInterfaceState(ptr long)
 @ stub IoSetDeviceToVerify
diff --git a/dlls/ntoskrnl.exe/tests/driver.c b/dlls/ntoskrnl.exe/tests/driver.c
index e762ad0ccd7..f6cc442bab0 100644
--- a/dlls/ntoskrnl.exe/tests/driver.c
+++ b/dlls/ntoskrnl.exe/tests/driver.c
@@ -211,9 +211,18 @@ static void *get_proc_address(const char *name)
 static FILE_OBJECT *last_created_file;
 static unsigned int create_count, close_count;
 
+static NTSTATUS WINAPI test_irp_struct_completion_routine(DEVICE_OBJECT *reserved, IRP *irp, void *context)
+{
+    unsigned int *result = context;
+
+    *result = 1;
+    return STATUS_MORE_PROCESSING_REQUIRED;
+}
+
 static void test_irp_struct(IRP *irp, DEVICE_OBJECT *device)
 {
     IO_STACK_LOCATION *irpsp = IoGetCurrentIrpStackLocation( irp );
+    unsigned int irp_completion_result;
 
     ok(device == upper_device, "Expected device %p, got %p.\n", upper_device, device);
     ok(last_created_file != NULL, "last_created_file = NULL\n");
@@ -225,6 +234,34 @@ static void test_irp_struct(IRP *irp, DEVICE_OBJECT *device)
        "IRP thread is not the current thread\n");
 
     ok(IoGetRequestorProcess(irp) == IoGetCurrentProcess(), "processes didn't match\n");
+
+    irp = IoAllocateIrp(1, FALSE);
+    ok(irp->AllocationFlags == IRP_ALLOCATED_FIXED_SIZE, "Got unexpected irp->AllocationFlags %#x.\n",
+            irp->AllocationFlags);
+    ok(irp->CurrentLocation == 2,
+            "Got unexpected irp->CurrentLocation %u.\n", irp->CurrentLocation);
+    IoSetCompletionRoutine(irp, test_irp_struct_completion_routine, &irp_completion_result,
+            TRUE, TRUE, TRUE);
+
+    irp_completion_result = 0;
+
+    irp->IoStatus.Status = STATUS_SUCCESS;
+    --irp->CurrentLocation;
+    --irp->Tail.Overlay.CurrentStackLocation;
+    IoCompleteRequest(irp, IO_NO_INCREMENT);
+    ok(irp->CurrentLocation == 2,
+            "Got unexpected irp->CurrentLocation %u.\n", irp->CurrentLocation);
+    ok(irp_completion_result, "IRP completion was not called.\n");
+
+    --irp->CurrentLocation;
+    --irp->Tail.Overlay.CurrentStackLocation;
+    IoReuseIrp(irp, STATUS_UNSUCCESSFUL);
+    ok(irp->CurrentLocation == 2,
+            "Got unexpected irp->CurrentLocation %u.\n", irp->CurrentLocation);
+    ok(irp->AllocationFlags == IRP_ALLOCATED_FIXED_SIZE, "Got unexpected irp->AllocationFlags %#x.\n",
+            irp->AllocationFlags);
+
+    IoFreeIrp(irp);
 }
 
 static void test_mdl_map(void)
diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h
index 0d98680cfa5..57e4cf4fe53 100644
--- a/include/ddk/wdm.h
+++ b/include/ddk/wdm.h
@@ -1679,6 +1679,7 @@ NTSTATUS  WINAPI IoRegisterDeviceInterface(PDEVICE_OBJECT,const GUID*,PUNICODE_S
 void      WINAPI IoReleaseCancelSpinLock(KIRQL);
 void      WINAPI IoReleaseRemoveLockAndWaitEx(IO_REMOVE_LOCK*,void*,ULONG);
 void      WINAPI IoReleaseRemoveLockEx(IO_REMOVE_LOCK*,void*,ULONG);
+void      WINAPI IoReuseIrp(IRP*,NTSTATUS);
 NTSTATUS  WINAPI IoSetDeviceInterfaceState(UNICODE_STRING*,BOOLEAN);
 NTSTATUS  WINAPI IoWMIRegistrationControl(PDEVICE_OBJECT,ULONG);