NTSTATUS NTAPI FatRead	(	PDEVICE_OBJECT	DeviceObject,
		PIRP	Irp
	)

Definition at line 75 of file rw.c.

{
    NTSTATUS Status;
    BOOLEAN TopLevel, CanWait;
    PFAT_IRP_CONTEXT IrpContext;

    CanWait = TRUE;
    TopLevel = FALSE;
    Status = STATUS_INVALID_DEVICE_REQUEST;
    /* Get CanWait flag */
    if (IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL)
        CanWait = IoIsOperationSynchronous(Irp);

    /* Enter FsRtl critical region */
    FsRtlEnterFileSystem();

    if (DeviceObject != FatGlobalData.DiskDeviceObject)
    {
        /* Set Top Level IRP if not set */
        TopLevel = FatIsTopLevelIrp(Irp);

        /* Build an irp context */
        IrpContext = FatBuildIrpContext(Irp, CanWait);

        /* Perform the actual read */
        Status = FatiRead(IrpContext);

        /* Restore top level Irp */
        if (TopLevel)
            IoSetTopLevelIrp(NULL);
    }
    /* Leave FsRtl critical region */
    FsRtlExitFileSystem();

    return Status;
}

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