[dm-devel] [PATCH] DM RAID: add RAID1 support

[Christoph Hellwig]

> +#ifdef md_raid1_congested
> +	if (rs->raid_type->level == 1)
> +		return md_raid1_congested(&rs->md, bits);
> +#endif
> +
>  	return md_raid5_congested(&rs->md, bits);

How well is this tested?  md_raid1_congested is a not a cpp macro
in your md patch, so with that patch it never would be called.

Also I think the congested call really should go through function
pointer indirections instead of opencoding all possible variants like
this.