Re: [PATCH blktests v2 1/2] bcache: add bcache/001

> +declare -a BCACHE_DEVS=()
> +declare -a BCACHE_BDEVS=()
> +declare -a BCACHE_CSETS=()

I've change _create_bcache so it returns the bcache device, thus I can
hand those into the _remove_bcache function thus no need for globals
anymore. So don't spend too much in reviewing this :)