Sample Code

windows driver samples/ cdfs file system driver/ C++/ shutdown.c/

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/*++
 
Copyright (c) 1997-2006 Microsoft Corporation
 
Module Name:
 
    Shutdown.c
 
Abstract:
 
    This module implements the shutdown routine for CDFS called by
    the dispatch driver.
 
 
--*/
 
#include "CdProcs.h"
 
//
//  The Bug check file id for this module
//
 
#define BugCheckFileId                   (CDFS_BUG_CHECK_SHUTDOWN)
 
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, CdCommonShutdown)
#endif
 
_Requires_lock_held_(_Global_critical_region_)
NTSTATUS
CdCommonShutdown (
    _Inout_ PIRP_CONTEXT IrpContext,
    _Inout_ PIRP Irp
    )
 
/*++
 
Routine Description:
 
    This is the common routine for handling shutdown operation called
    by both the fsd and fsp threads
 
Arguments:
 
    Irp - Supplies the Irp to process
 
Return Value:
 
    NTSTATUS - The return status for the operation
 
--*/
 
{
    KEVENT Event;
    PLIST_ENTRY Links;
    PVCB Vcb;
    PIRP NewIrp;
    IO_STATUS_BLOCK Iosb;
    BOOLEAN VcbPresent;
    NTSTATUS Status;
 
    PAGED_CODE();
 
    //
    //  Make sure we don't get any pop-ups.
    //
 
    SetFlag( IrpContext->Flags, IRP_CONTEXT_FLAG_DISABLE_POPUPS );
 
    //
    //  Initialize an event for doing calls down to
    //  our target device objects.
    //
 
    KeInitializeEvent( &Event, NotificationEvent, FALSE );
 
    //
    //  Indicate that shutdown has started.
    //
 
    SetFlag( CdData.Flags, CD_FLAGS_SHUTDOWN );
 
    //
    //  Get everyone else out of the way
    //
 
    CdAcquireCdData( IrpContext );
 
    //
    //  Now walk through all the mounted Vcb's and shutdown the target
    //  device objects.
    //
 
    Links = CdData.VcbQueue.Flink;
 
    while (Links != &CdData.VcbQueue) {
 
        Vcb = CONTAINING_RECORD( Links, VCB, VcbLinks );
 
        //
        //  Move to the next link now since the current Vcb may be deleted.
        //
 
        Links = Links->Flink;
 
        //
        //  If we have already been called before for this volume
        //  (and yes this does happen), skip this volume as no writes
        //  have been allowed since the first shutdown.
        //
 
        if (FlagOn( Vcb->VcbState, VCB_STATE_SHUTDOWN ) ||
            (Vcb->VcbCondition != VcbMounted)) {
 
            continue;
        }
 
    #pragma prefast(suppress: 28103)
        CdAcquireVcbExclusive( IrpContext, Vcb, FALSE );
 
        CdPurgeVolume( IrpContext, Vcb, FALSE );
 
        //
        //  Build an irp for this volume stack - our own irp is probably too small and
        //  each stack may have a different stack size.
        //
 
        NewIrp = IoBuildSynchronousFsdRequest( IRP_MJ_SHUTDOWN,
                                               Vcb->TargetDeviceObject,
                                               NULL,
                                               0,
                                               NULL,
                                               &Event,
                                               &Iosb );
 
        if (NewIrp != NULL) {
 
            Status = IoCallDriver( Vcb->TargetDeviceObject, NewIrp );
 
            if (Status == STATUS_PENDING) {
 
                (VOID)KeWaitForSingleObject( &Event,
                                             Executive,
                                             KernelMode,
                                             FALSE,
                                             NULL );
            }
 
            KeClearEvent( &Event );
        }
 
        SetFlag( Vcb->VcbState, VCB_STATE_SHUTDOWN );
 
        //
        //  Attempt to punch the volume down.
        //
 
        VcbPresent = CdCheckForDismount( IrpContext, Vcb, FALSE );
 
        if (VcbPresent) {
 
            CdReleaseVcb( IrpContext, Vcb );
        }
    }
 
 
    CdReleaseCdData( IrpContext );
 
    IoUnregisterFileSystem( CdData.FileSystemDeviceObject );
    IoDeleteDevice( CdData.FileSystemDeviceObject );
 
    CdCompleteRequest( IrpContext, Irp, STATUS_SUCCESS );
    return STATUS_SUCCESS;
}

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