/*
* @halfplemented
*/
VOID
NTAPI
IopDecrementDeviceObjectRef(IN PDEVICE_OBJECT DeviceObject,
IN BOOLEAN UnloadIfUnused)
{
KIRQL OldIrql;
/* Acquire lock */
OldIrql = KeAcquireQueuedSpinLock(LockQueueIoDatabaseLock);
ASSERT(DeviceObject->ReferenceCount > 0);
if (--DeviceObject->ReferenceCount > 0)
{
KeReleaseQueuedSpinLock(LockQueueIoDatabaseLock, OldIrql);
return;
}
/* Here, DO is not referenced any longer, check if we have to unload it */
if (UnloadIfUnused || IoGetDevObjExtension(DeviceObject)->ExtensionFlags &
(DOE_UNLOAD_PENDING | DOE_DELETE_PENDING | DOE_REMOVE_PENDING))
{
/* Unload the driver */
IopUnloadDevice(DeviceObject);
}
/* Release lock */
KeReleaseQueuedSpinLock(LockQueueIoDatabaseLock, OldIrql);
}
PVPB
NTAPI
IopMountInitializeVpb(IN PDEVICE_OBJECT DeviceObject,
IN PDEVICE_OBJECT AttachedDeviceObject,
IN BOOLEAN Raw)
{
KIRQL OldIrql;
PVPB Vpb;
/* Lock the VPBs */
IoAcquireVpbSpinLock(&OldIrql);
Vpb = DeviceObject->Vpb;
/* Set the VPB as mounted and possibly raw */
Vpb->Flags |= VPB_MOUNTED | (Raw ? VPB_RAW_MOUNT : 0);
/* Set the stack size */
Vpb->DeviceObject->StackSize = AttachedDeviceObject->StackSize;
/* Add one for the FS Driver */
Vpb->DeviceObject->StackSize++;
/* Set the VPB in the device extension */
IoGetDevObjExtension(Vpb->DeviceObject)->Vpb = Vpb;
/* Reference it */
Vpb->ReferenceCount++;
/* Release the VPB lock and return it */
IoReleaseVpbSpinLock(OldIrql);
return Vpb;
}
ObDereferenceObject(DeviceObject->DriverObject);
}
PDEVICE_OBJECT
NTAPI
IopAttachDeviceToDeviceStackSafe(IN PDEVICE_OBJECT SourceDevice,
IN PDEVICE_OBJECT TargetDevice,
OUT PDEVICE_OBJECT *AttachedToDeviceObject OPTIONAL)
{
PDEVICE_OBJECT AttachedDevice;
PEXTENDED_DEVOBJ_EXTENSION SourceDeviceExtension;
/* Get the Attached Device and source extension */
AttachedDevice = IoGetAttachedDevice(TargetDevice);
SourceDeviceExtension = IoGetDevObjExtension(SourceDevice);
ASSERT(SourceDeviceExtension->AttachedTo == NULL);
/* Make sure that it's in a correct state */
if ((AttachedDevice->Flags & DO_DEVICE_INITIALIZING) ||
(IoGetDevObjExtension(AttachedDevice)->ExtensionFlags &
(DOE_UNLOAD_PENDING |
DOE_DELETE_PENDING |
DOE_REMOVE_PENDING |
DOE_REMOVE_PROCESSED)))
{
/* Device was unloading or being removed */
AttachedDevice = NULL;
}
else
{
