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208 lines
4.0 KiB
208 lines
4.0 KiB
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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FileInfo.c
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Abstract:
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This module implements the File Information routines for Raw called by
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the dispatch driver.
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Author:
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David Goebel [DavidGoe] 13-May-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, RawQueryInformation)
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#pragma alloc_text(PAGE, RawSetInformation)
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#endif
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NTSTATUS
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RawQueryInformation (
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IN PVCB Vcb,
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IN PIRP Irp,
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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 routine for querying file information, though only
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query current file position is supported.
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Arguments:
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Vcb - Supplies the volume being queried.
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Irp - Supplies the Irp being processed.
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IrpSp - Supplies parameters describing the query
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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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NTSTATUS Status;
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PULONG Length;
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FILE_INFORMATION_CLASS FileInformationClass;
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PFILE_POSITION_INFORMATION Buffer;
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PAGED_CODE();
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//
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// Reference our input parameters to make things easier
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//
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Length = &IrpSp->Parameters.QueryFile.Length;
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FileInformationClass = IrpSp->Parameters.QueryFile.FileInformationClass;
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Buffer = Irp->AssociatedIrp.SystemBuffer;
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//
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// The only request that is valid for raw is to query file position.
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//
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if ( FileInformationClass == FilePositionInformation ) {
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//
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// Make sure the buffer is large enough
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//
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if (*Length < sizeof(FILE_POSITION_INFORMATION)) {
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Irp->IoStatus.Information = 0;
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Status = STATUS_BUFFER_OVERFLOW;
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} else {
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//
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// Get the current position found in the file object.
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//
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Buffer->CurrentByteOffset = IrpSp->FileObject->CurrentByteOffset;
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//
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// Update the length, irp info, and status output variables
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//
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*Length -= sizeof( FILE_POSITION_INFORMATION );
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Irp->IoStatus.Information = sizeof( FILE_POSITION_INFORMATION );
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Status = STATUS_SUCCESS;
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}
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} else {
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Status = STATUS_INVALID_DEVICE_REQUEST;
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}
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RawCompleteRequest( Irp, Status );
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UNREFERENCED_PARAMETER( Vcb );
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return Status;
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}
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NTSTATUS
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RawSetInformation (
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IN PVCB Vcb,
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IN PIRP Irp,
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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 routine for setting file information, though only
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setting current file position is supported.
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Arguments:
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Vcb - Supplies the volume being queried.
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Irp - Supplies the Irp being processed.
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IrpSp - Supplies parameters describing the set
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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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NTSTATUS Status;
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FILE_INFORMATION_CLASS FileInformationClass;
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PFILE_POSITION_INFORMATION Buffer;
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PFILE_OBJECT FileObject;
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PAGED_CODE();
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//
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// Reference our input parameters to make things easier
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//
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FileInformationClass = IrpSp->Parameters.SetFile.FileInformationClass;
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Buffer = (PFILE_POSITION_INFORMATION)Irp->AssociatedIrp.SystemBuffer;
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FileObject= IrpSp->FileObject;
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//
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// The only request that is valid for raw is to set file position.
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//
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if ( FileInformationClass == FilePositionInformation ) {
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//
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// Check that the new position we're supplied is aligned properly
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// for the device.
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//
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PDEVICE_OBJECT DeviceObject;
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DeviceObject = IoGetRelatedDeviceObject( IrpSp->FileObject );
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if ((Buffer->CurrentByteOffset.LowPart & DeviceObject->AlignmentRequirement) != 0) {
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Status = STATUS_INVALID_PARAMETER;
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} else {
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//
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// The input parameter is fine so set the current byte offset.
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//
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FileObject->CurrentByteOffset = Buffer->CurrentByteOffset;
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Status = STATUS_SUCCESS;
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}
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} else {
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Status = STATUS_INVALID_DEVICE_REQUEST;
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}
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RawCompleteRequest( Irp, Status );
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UNREFERENCED_PARAMETER( Vcb );
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return Status;
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}
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