Function Ext2CheckDismount

Ext4Fsd/fsctl.c:2593–2703

}

BOOLEAN
Ext2CheckDismount (
    IN PEXT2_IRP_CONTEXT IrpContext,
    IN PEXT2_VCB         Vcb,
    IN BOOLEAN           bForce   )
{
    KIRQL   Irql;
    PVPB    Vpb = Vcb->Vpb, NewVpb = NULL;
    BOOLEAN bDeleted = FALSE, bTearDown = FALSE;
    ULONG   UnCleanCount = 0;

    NewVpb = Ext2AllocatePool(NonPagedPool, VPB_SIZE, TAG_VPB);
    if (NewVpb == NULL) {
        DEBUG(DL_ERR, ( "Ex2CheckDismount: failed to allocate NewVpb.\n"));
        return FALSE;
    }
    DEBUG(DL_DBG, ("Ext2CheckDismount: NewVpb allocated: %p\n", NewVpb));
    INC_MEM_COUNT(PS_VPB, NewVpb, sizeof(VPB));
    memset(NewVpb, '_', VPB_SIZE);
    RtlZeroMemory(NewVpb, sizeof(VPB));

    ExAcquireResourceExclusiveLite(
        &Ext2Global->Resource, TRUE );

    ExAcquireResourceExclusiveLite(
        &Vcb->MainResource, TRUE );

    if (IrpContext && 
        IrpContext->MajorFunction == IRP_MJ_CREATE &&
        IrpContext->RealDevice == Vcb->RealDevice) {
        UnCleanCount = 2;
    } else {
        UnCleanCount = 1;
    }

    IoAcquireVpbSpinLock (&Irql);

    DEBUG(DL_DBG, ("Ext2CheckDismount: Vpb %p ioctl=%d Device %p\n",
                   Vpb, Vpb->ReferenceCount, Vpb->RealDevice));

    if (Vpb->ReferenceCount <= UnCleanCount) {

        if (!IsFlagOn(Vcb->Flags, VCB_DISMOUNT_PENDING)) {

            ClearFlag(Vpb->Flags, VPB_MOUNTED);
            ClearFlag(Vpb->Flags, VPB_LOCKED);

            if ((Vcb->RealDevice != Vpb->RealDevice) &&
                    (Vcb->RealDevice->Vpb == Vpb)) {
                SetFlag(Vcb->RealDevice->Flags, DO_DEVICE_INITIALIZING);
                SetFlag(Vpb->Flags, VPB_PERSISTENT );
            }

            Ext2RemoveVcb(Vcb);
            SetLongFlag(Vcb->Flags, VCB_DISMOUNT_PENDING);
        }

        if (Vpb->ReferenceCount) {