[dm-devel] [PATCH 1/5] blk-mq: introduce BLK_STS_DEV_RESOURCE

[Christoph Hellwig]

> -		if (ret == BLK_STS_RESOURCE) {
> +		if ((ret == BLK_STS_RESOURCE) || (ret == BLK_STS_DEV_RESOURCE)) {

No need for the inner braces here.

> +	if ((ret == BLK_STS_RESOURCE) || (ret == BLK_STS_DEV_RESOURCE))

Same here.

> +/*
> + * This status is returned from driver to block layer if device related
> + * resource is run out of, but driver can guarantee that IO dispatch is
> + * triggered in future when the resource is available.
> + */
> +#define BLK_STS_DEV_RESOURCE	((__force blk_status_t)13)

We'll need some good explanation on BLK_STS_RESOURCE vs
BLK_STS_DEV_RESOURCE I think.

Except for these nitpicks this looks fine to me.