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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
ReadWrit.c
Abstract:
This module implements the File Read and Write routines called by the
dispatch driver.
Author:
David Goebel [DavidGoe] 28-Feb-1991
Revision History:
--*/
#include "RawProcs.h"
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, RawReadWriteDeviceControl)
#endif
NTSTATUS
RawReadWriteDeviceControl (
IN PVCB Vcb,
IN PIRP Irp,
IN PIO_STACK_LOCATION IrpSp
)
/*++
Routine Description:
This is the a common routine for both reading and writing a volume.
Arguments:
Vcb - Supplies the volume being queried.
Irp - Supplies the Irp to process
IrpSp - Supplies parameters describing the read or write
Return Value:
NTSTATUS - The return status for the operation
--*/
{
PIO_STACK_LOCATION NextIrpSp;
NTSTATUS Status;
PAGED_CODE();
//
// If this was for a zero byte read or write transfer, just complete
// it with success.
//
if (((IrpSp->MajorFunction == IRP_MJ_READ) ||
(IrpSp->MajorFunction == IRP_MJ_WRITE)) &&
(IrpSp->Parameters.Read.Length == 0)) {
RawCompleteRequest( Irp, STATUS_SUCCESS );
return STATUS_SUCCESS;
}
//
// This is a very simple operation. Simply forward the
// request to the device driver since exact blocks are
// being read and return whatever status was given.
//
// Get the next stack location, and copy over the stack location
//
NextIrpSp = IoGetNextIrpStackLocation( Irp );
*NextIrpSp = *IrpSp;
//
// Prohibit verifies all together.
//
NextIrpSp->Flags |= SL_OVERRIDE_VERIFY_VOLUME;
//
// Set up the completion routine
//
IoSetCompletionRoutine( Irp,
RawCompletionRoutine,
NULL,
TRUE,
TRUE,
TRUE );
//
// Send the request.
//
Status = IoCallDriver(Vcb->TargetDeviceObject, Irp);
return Status;
}
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