linux-ext4 - Re: [PATCH 07/10] fs: return on congested block device

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Message-ID: <dedfe92d-6452-4f29-044d-34837c4da825@kernel.dk>
Date:   Mon, 5 Jun 2017 09:35:24 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Goldwyn Rodrigues <rgoldwyn@...e.de>, linux-fsdevel@...r.kernel.org
Cc:     jack@...e.com, hch@...radead.org, linux-block@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-api@...r.kernel.org,
        adam.manzanares@....com, viro@...iv.linux.org.uk,
        Goldwyn Rodrigues <rgoldwyn@...e.com>
Subject: Re: [PATCH 07/10] fs: return on congested block device

On 06/04/2017 11:35 PM, Goldwyn Rodrigues wrote:
> @@ -1900,6 +1905,17 @@ generic_make_request_checks(struct bio *bio)
>  		goto end_io;
>  	}
>  
> +	/*
> +	 * For a REQ_NOWAIT based request, return -EOPNOTSUPP
> +	 * if queue does not have QUEUE_FLAG_NOWAIT_SUPPORT set
> +	 * and if it is not a request based queue.
> +	 */
> +
> +	if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_rq_based(q)) {
> +		err = -EOPNOTSUPP;
> +		goto end_io;
> +	}

There is no QUEUE_FLAG_NOWAIT, this looks like a somewhat stale comment.

This patch should be prefixed with 'block', not 'fs'.

-- 
Jens Axboe