/*++////////////////////////////////////////////////////////////////////////////
RetryRequest()
Routine Description:
This is a wrapper around the delayed retry DPC routine, RetryRequestDPC.
This reinitializes the necessary fields, queues the request, and sets
a timer to call the DPC if someone hasn't already done so.
Arguments:
DeviceObject - Supplies the device object associated with this request.
Irp - Supplies the request to be retried.
Srb - Supplies a Pointer to the SCSI request block to be retied.
Associated - Indicates this is an associated Irp created by split request.
RetryInterval - How long, in seconds, before retrying the request.
Return Value:
None
--*/
VOID
NTAPI
RetryRequest(
PDEVICE_OBJECT DeviceObject,
PIRP Irp,
PSCSI_REQUEST_BLOCK Srb,
BOOLEAN Associated,
ULONG RetryInterval
)
{
PIO_STACK_LOCATION currentIrpStack = IoGetCurrentIrpStackLocation(Irp);
PIO_STACK_LOCATION nextIrpStack = IoGetNextIrpStackLocation(Irp);
ULONG transferByteCount;
// This function is obsolete but is still used by some of our class drivers.
// DBGWARN(("RetryRequest is OBSOLETE !"));
//
// Determine the transfer count of the request. If this is a read or a
// write then the transfer count is in the Irp stack. Otherwise assume
// the MDL contains the correct length. If there is no MDL then the
// transfer length must be zero.
//
if (currentIrpStack->MajorFunction == IRP_MJ_READ ||
currentIrpStack->MajorFunction == IRP_MJ_WRITE) {
transferByteCount = currentIrpStack->Parameters.Read.Length;
} else if (Irp->MdlAddress != NULL) {
//
// Note this assumes that only read and write requests are spilt and
// other request do not need to be. If the data buffer address in
// the MDL and the SRB don't match then transfer length is most
// likely incorrect.
//
ASSERT(Srb->DataBuffer == MmGetMdlVirtualAddress(Irp->MdlAddress));
transferByteCount = Irp->MdlAddress->ByteCount;
} else {
transferByteCount = 0;
}
//
// this is a safety net. this should not normally be hit, since we are
// not guaranteed to be an fdoExtension
//
ASSERT(!TEST_FLAG(Srb->SrbFlags, SRB_FLAGS_FREE_SENSE_BUFFER));
//
// Reset byte count of transfer in SRB Extension.
//
Srb->DataTransferLength = transferByteCount;
//
// Zero SRB statuses.
//
Srb->SrbStatus = Srb->ScsiStatus = 0;
//
// Set the no disconnect flag, disable synchronous data transfers and
// disable tagged queuing. This fixes some errors.
// NOTE: Cannot clear these flags, just add to them
//
SET_FLAG(Srb->SrbFlags, SRB_FLAGS_DISABLE_DISCONNECT);
SET_FLAG(Srb->SrbFlags, SRB_FLAGS_DISABLE_SYNCH_TRANSFER);
CLEAR_FLAG(Srb->SrbFlags, SRB_FLAGS_QUEUE_ACTION_ENABLE);
Srb->QueueTag = SP_UNTAGGED;
//
// Set up major SCSI function.
//
nextIrpStack->MajorFunction = IRP_MJ_SCSI;
//
// Save SRB address in next stack for port driver.
//
nextIrpStack->Parameters.Scsi.Srb = Srb;
IoSetCompletionRoutine(Irp, ClassIoComplete, Srb, TRUE, TRUE, TRUE);
{
LARGE_INTEGER retry100ns;
retry100ns.QuadPart = RetryInterval; // seconds
retry100ns.QuadPart *= (LONGLONG)1000 * 1000 * 10;
ClassRetryRequest(DeviceObject, Irp, retry100ns);
}
return;
} // end RetryRequest()
/*++////////////////////////////////////////////////////////////////////////////
RetryPowerRequest()
Routine Description:
This routine reinitializes the necessary fields, and sends the request
to the lower driver.
Arguments:
DeviceObject - Supplies the device object associated with this request.
Irp - Supplies the request to be retried.
Context - Supplies a pointer to the power up context for this request.
Return Value:
None
--*/
VOID
NTAPI
RetryPowerRequest(
PDEVICE_OBJECT DeviceObject,
PIRP Irp,
PCLASS_POWER_CONTEXT Context
)
{
PIO_STACK_LOCATION nextIrpStack = IoGetNextIrpStackLocation(Irp);
PSCSI_REQUEST_BLOCK srb = &(Context->Srb);
LARGE_INTEGER dueTime;
DebugPrint((1, "(%p)\tDelaying retry by queueing DPC\n", Irp));
ASSERT(Context->Irp == Irp);
ASSERT(Context->DeviceObject == DeviceObject);
ASSERT(!TEST_FLAG(Context->Srb.SrbFlags, SRB_FLAGS_FREE_SENSE_BUFFER));
ASSERT(!TEST_FLAG(Context->Srb.SrbFlags, SRB_FLAGS_PORT_DRIVER_ALLOCSENSE));
//
// reset the retry interval
//
Context->RetryInterval = 0;
//
// Reset byte count of transfer in SRB Extension.
//
srb->DataTransferLength = 0;
//
// Zero SRB statuses.
//
srb->SrbStatus = srb->ScsiStatus = 0;
//
// Set up major SCSI function.
//
nextIrpStack->MajorFunction = IRP_MJ_SCSI;
//
// Save SRB address in next stack for port driver.
//
nextIrpStack->Parameters.Scsi.Srb = srb;
//
// Set the completion routine up again.
//
IoSetCompletionRoutine(Irp, Context->CompletionRoutine, Context,
TRUE, TRUE, TRUE);
if (Context->RetryInterval == 0) {
DebugPrint((2, "(%p)\tDelaying minimum time (.2 sec)\n", Irp));
dueTime.QuadPart = (LONGLONG)1000000 * 2;
} else {
DebugPrint((2, "(%p)\tDelaying %x seconds\n",
Irp, Context->RetryInterval));
dueTime.QuadPart = (LONGLONG)1000000 * 10 * Context->RetryInterval;
}
ClassRetryRequest(DeviceObject, Irp, dueTime);
return;
} // end RetryRequest()
