linux-ext4 - Re: [PATCH 5/8] nowait aio: return on congested block device

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Date:   Wed, 8 Mar 2017 07:51:58 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     Goldwyn Rodrigues <rgoldwyn@...e.de>,
        Sagi Grimberg <sagi@...mberg.me>, jack@...e.com,
        hch@...radead.org, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        Goldwyn Rodrigues <rgoldwyn@...e.com>
Subject: Re: [PATCH 5/8] nowait aio: return on congested block device

On Wed, Mar 08, 2017 at 04:28:06PM +0100, Jan Kara wrote:
> Well, that's not really good. If we cannot support this for both blk-mq and
> legacy block layer the feature will not be usable. So please work on blk-mq
> support as well.

Exactly.  In addition to that anything implementing a feature for the
legacy request request code but not blk-mq is grounds for an instant
NAK.