Re: [PATCH 03/13] blk-cgroup: allow controllers to output their own stats

[Tejun Heo <tj@kernel.org>]

On Tue, May 29, 2018 at 05:17:14PM -0400, Josef Bacik wrote:
...
> +		mutex_lock(&blkcg_pol_mutex);
> +		for (i = 0; i < BLKCG_MAX_POLS; i++) {
> +			struct blkcg_policy *pol = blkcg_policy[i];
> +
> +			if (!blkg->pd[i] || !pol->pd_stat_fn)
> +				continue;
> +
> +			count = pol->pd_stat_fn(blkg->pd[i], buf, size);

Wouldn't it be easier to simply pass in the seq_file?

> +			if (count >= size)
> +				continue;
> +			buf += count;
> +			total += count;
> +			size -= count + 1;
> +		}
> +		mutex_unlock(&blkcg_pol_mutex);
> +		if (total) {
> +			count = snprintf(buf, size, "\n");
> +			if (count >= size)
> +				continue;

scnprintf() might make this less painful.

> +			total += count;
> +			seq_commit(sf, total);
> +		}

Thanks.

-- 
tejun