Re: [PATCH 2/9] db: verify buffer on type change

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

> +void
> +set_iocur_type(
> +     const typ_t     *t)
> +{
> +     const struct xfs_buf_ops *ops = t ? t->bops : NULL;
> +     struct xfs_buf  *bp = iocur_top->bp;
> +
> +     iocur_top->typ = t;
> +
> +     /* verify the buffer if the type has one. */
> +     if (!bp)
> +             return;
> +     if (!ops) {
> +             bp->b_ops = NULL;
> +             bp->b_flags |= LIBXFS_B_UNCHECKED;
> +             return;
> +     }

The only caller currently makes sure we never pass a NULL t argument,
and I think keeping it that way is sensible.  If we want to allow
clearing the type we should add a separate clear_iocur_type helper for
it.