On Mon, 24 Oct 2022 12:05:50 -0700 Stefan Roesch <shr@xxxxxxxxxxxx> wrote:
> This adds the bdi_set_strict_limit function to be able to set/unset the
> BDI_CAP_STRICTLIMIT flag.
>
> ...
>
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -698,6 +698,22 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned max_ratio)
> }
> EXPORT_SYMBOL(bdi_set_max_ratio);
>
> +int bdi_set_strict_limit(struct backing_dev_info *bdi, unsigned int strict_limit)
> +{
> + if (strict_limit > 1)
> + return -EINVAL;
> +
> + spin_lock_bh(&bdi_lock);
> + if (strict_limit)
> + bdi->capabilities |= BDI_CAP_STRICTLIMIT;
> + else
> + bdi->capabilities &= ~BDI_CAP_STRICTLIMIT;
> + spin_unlock_bh(&bdi_lock);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(bdi_set_strict_limit);
I don't believe the export is needed?
