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