Re: [PATCH 5/9] nowait aio: return on congested block device

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As mentioned last time around, this should be a REQ_NOWAIT flag so
that it can be easily passed down to the request layer.

> +static inline void bio_wouldblock_error(struct bio *bio)
> +{
> +	bio->bi_error = -EAGAIN;
> +	bio_endio(bio);
> +}

Please skip this helper..

> +#define QUEUE_FLAG_NOWAIT      28	/* queue supports BIO_NOWAIT */

Please make the flag name a little more descriptive, this sounds like
it will never wait.
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