88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
/*++
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Copyright (c) 2000-2001 Microsoft Corporation
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Module Name:
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devctrl.c
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Abstract:
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This module implements routines related to handling IRP_MJ_DEVICE_CONTROL.
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--*/
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#include "fatx.h"
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NTSTATUS
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FatxFsdDeviceControl(
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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 is called by the I/O manager to handle IRP_MJ_DEVICE_CONTROL
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requests.
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Arguments:
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DeviceObject - Specifies the device object that the I/O request is for.
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Irp - Specifies the packet that describes the I/O request.
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Return Value:
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Status of operation.
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--*/
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{
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NTSTATUS status;
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PFAT_VOLUME_EXTENSION VolumeExtension;
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VolumeExtension = (PFAT_VOLUME_EXTENSION)DeviceObject->DeviceExtension;
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FatxAcquireVolumeMutexShared(VolumeExtension);
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//
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// Check if the volume has been dismounted.
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//
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if (FatxIsFlagSet(VolumeExtension->Flags, FAT_VOLUME_DISMOUNTED)) {
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status = STATUS_VOLUME_DISMOUNTED;
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goto CleanupAndExit;
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}
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//
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// Set a completion routine to unlock the volume mutex.
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//
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IoCopyCurrentIrpStackLocationToNext(Irp);
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IoSetCompletionRoutine(Irp, FatxVolumeIoCompletion, NULL, TRUE, TRUE,
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TRUE);
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//
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// Call down to the target device.
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//
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status = IoCallDriver(VolumeExtension->TargetDeviceObject, Irp);
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//
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// Leave the critical region that we acquired when we took the volume mutex.
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//
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KeLeaveCriticalRegion();
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return status;
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CleanupAndExit:
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FatxReleaseVolumeMutex(VolumeExtension);
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Irp->IoStatus.Status = status;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return status;
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}
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