linux-kernel - Re: [v12 1/2] fs: New zonefs file system

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Message-ID: <97fc31e3-94a7-406b-6264-42da5d5b5d0f@web.de>
Date:   Fri, 7 Feb 2020 08:18:09 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     Damien Le Moal <Damien.LeMoal@....com>,
        Dave Chinner <david@...morbit.com>,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Hannes Reinecke <hare@...e.de>,
        Johannes Thumshirn <jth@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Naohiro Aota <Naohiro.Aota@....com>
Subject: Re: [v12 1/2] fs: New zonefs file system

> > Hmmm. I'm wondering if it would be better to return -EOPNOTSUPP here
> > so that the application knows it can't do non-blocking write AIO to
> > this file.
>
> I wondered the same too. In the end, I decided to go with silently ignoring
> the flag (for now) since raw block device accesses do the same (the NOWAIT
> support is not complete and IOs may wait on free tags). I have an idea for
> fixing simply the out-of-order issuing that may result from using nowait.

I find this aspect interesting for further clarification.


> I will send a patch for that later and can then remove this.

Should another software improvement be integrated into the initial proposal?

Regards,
Markus