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278 lines
4.3 KiB
278 lines
4.3 KiB
/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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dispatch.c
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Abstract:
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This module contains the IRP dispatch code for SPUD.
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Author:
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Keith Moore (keithmo) 09-Feb-1998
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Revision History:
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--*/
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#include "spudp.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text( PAGE, SpudIrpCreate )
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#pragma alloc_text( PAGE, SpudIrpClose )
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#pragma alloc_text( PAGE, SpudIrpQuery )
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#endif
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#if 0
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NOT PAGEABLE -- SpudIrpCleanup
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#endif
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//
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// Public functions.
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//
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NTSTATUS
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SpudIrpCreate(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine handles IRP_MJ_CREATE IRPs. IRP_MJ_CREATE is issued when
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a new file object is being created.
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Arguments:
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DeviceObject - Pointer to the target device object.
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Irp - Pointer to the I/O request packet.
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Return Value:
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NTSTATUS - Completion status.
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--*/
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{
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NTSTATUS status = STATUS_SUCCESS;
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PVOID xchg;
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//
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// Sanity check.
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//
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PAGED_CODE();
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//
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// Ensure this is the only process that may access the driver.
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//
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xchg = InterlockedCompareExchangePointer(
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(PVOID *)&SpudOwningProcess,
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(PVOID)PsGetCurrentProcess(),
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NULL
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);
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ASSERT( xchg == NULL );
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//
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// Complete the IRP.
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//
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Irp->IoStatus.Status = status;
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IoCompleteRequest( Irp, SPUD_PRIORITY_BOOST );
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return status;
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} // SpudIrpCreate
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NTSTATUS
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SpudIrpClose(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine handles IRP_MJ_CLOSE IRPs. IRP_MJ_CLOSE is issued when
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the final reference to a file object is removed and the object is
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being destroyed.
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Arguments:
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DeviceObject - Pointer to the target device object.
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Irp - Pointer to the I/O request packet.
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Return Value:
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NTSTATUS - Completion status.
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--*/
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{
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NTSTATUS status = STATUS_SUCCESS;
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PVOID xchg;
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//
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// Sanity check.
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//
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PAGED_CODE();
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//
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// Clear the owner process.
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//
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xchg = InterlockedCompareExchangePointer(
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(PVOID *)&SpudOwningProcess,
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NULL,
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(PVOID)PsGetCurrentProcess()
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);
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ASSERT( xchg == (PVOID)PsGetCurrentProcess() );
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//
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// Dereference the I/O completion port.
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//
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SpudDereferenceCompletionPort();
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//
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// Complete the IRP;
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//
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Irp->IoStatus.Status = status;
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IoCompleteRequest( Irp, SPUD_PRIORITY_BOOST );
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return status;
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} // SpudIrpClose
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NTSTATUS
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SpudIrpCleanup(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine handles IRP_MJ_CLEANUP IRPs. IRP_MJ_CLEANUP is issued
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when the last handle to a file object is closed.
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Arguments:
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DeviceObject - Pointer to the target device object.
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Irp - Pointer to the I/O request packet.
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Return Value:
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NTSTATUS - Completion status.
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--*/
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{
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NTSTATUS status = STATUS_SUCCESS;
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//
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// Complete the IRP;
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//
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Irp->IoStatus.Status = status;
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IoCompleteRequest( Irp, SPUD_PRIORITY_BOOST );
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return status;
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} // SpudIrpCleanup
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NTSTATUS
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SpudIrpQuery(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine handles IRP_MJ_QUERY IRPs.
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Arguments:
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DeviceObject - Pointer to the target device object.
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Irp - Pointer to the I/O request packet.
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Return Value:
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NTSTATUS - Completion status.
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--*/
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{
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NTSTATUS status = STATUS_SUCCESS;
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PIO_STACK_LOCATION irpSp;
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PFILE_NAME_INFORMATION nameInfo;
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ULONG bytesRequired;
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//
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// Sanity check.
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//
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PAGED_CODE();
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//
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// Validate the input arguments.
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//
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irpSp = IoGetCurrentIrpStackLocation( Irp );
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bytesRequired = sizeof(*nameInfo) - sizeof(nameInfo->FileName);
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if( irpSp->Parameters.QueryFile.Length >= bytesRequired ) {
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status = STATUS_INVALID_PARAMETER;
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}
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//
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// Return an empty name.
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//
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if( NT_SUCCESS(status) ) {
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nameInfo = Irp->AssociatedIrp.SystemBuffer;
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nameInfo->FileNameLength = 0;
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Irp->IoStatus.Information = bytesRequired;
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}
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//
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// Complete the IRP.
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//
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Irp->IoStatus.Status = status;
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IoCompleteRequest( Irp, SPUD_PRIORITY_BOOST );
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return status;
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} // SpudIrpQuery
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