135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
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/*++
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Copyright (c) 1993 Microsoft Corporation
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Module Name:
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FaultTol.c
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Abstract:
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The routines in this module help the file systems perform fault
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tolerance operation to the FT device drivers.
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Author:
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David Goebel [DavidGoe] 30-Mar-1993
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Revision History:
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--*/
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#include "FsRtlP.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, FsRtlBalanceReads)
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#pragma alloc_text(PAGE, FsRtlSyncVolumes)
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#endif
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NTSTATUS
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FsRtlBalanceReads (
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IN PDEVICE_OBJECT TargetDevice
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)
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/*++
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Routine Description:
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This routine signals a device driver that it is now OK to start
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balancing reads from a mirrored drive. This is typically called
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after the file system determines that a volume is clean.
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Arguments:
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TargetDevice - Supplies the device to start balanced read from.
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Return Value:
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NTSTATUS - The result of the operation. This will be
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STATUS_INVALID_DEVICE_REQUEST if the volume is not a mirror.
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--*/
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{
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PIRP Irp;
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KEVENT Event;
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IO_STATUS_BLOCK Iosb;
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NTSTATUS Status;
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KeInitializeEvent( &Event, NotificationEvent, FALSE );
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Irp = IoBuildDeviceIoControlRequest( FT_BALANCED_READ_MODE,
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TargetDevice,
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NULL,
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0,
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NULL,
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0,
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FALSE,
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&Event,
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&Iosb );
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if ( Irp == NULL ) {
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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Status = IoCallDriver( TargetDevice, Irp );
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if (Status == STATUS_PENDING) {
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Status = KeWaitForSingleObject( &Event,
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Executive,
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KernelMode,
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FALSE,
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NULL );
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ASSERT( Status == STATUS_SUCCESS );
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Status = Iosb.Status;
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}
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return Status;
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}
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NTSTATUS
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FsRtlSyncVolumes (
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IN PDEVICE_OBJECT TargetDevice,
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IN PLARGE_INTEGER ByteOffset OPTIONAL,
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IN PLARGE_INTEGER ByteCount
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)
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/*++
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Routine Description:
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This routine signals a device driver that it must sync redundant
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members of a mirror from the primary member. This is typically
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called after the file system determines that a volume is dirty.
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Arguments:
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TargetDevice - Supplies the device to sync.
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ByteOffset - If specified, gives the location to start syncing
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ByteCount - Gives the byte count to sync. Ignored if StartingOffset
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not specified.
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Return Value:
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NTSTATUS - The result of the operation. This will be
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STATUS_INVALID_DEVICE_REQUEST if the volume is not a mirror.
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--*/
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{
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UNREFERENCED_PARAMETER (TargetDevice);
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UNREFERENCED_PARAMETER (ByteOffset);
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UNREFERENCED_PARAMETER (ByteCount);
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return STATUS_SUCCESS;
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}
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