linux-kernel - Re: [PATCH 05/19] btrfs: disable direct IO in HMZONED mode

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Message-ID: <20190613140020.iiqzrkdztindfjyh@MacBook-Pro-91.local>
Date:   Thu, 13 Jun 2019 10:00:21 -0400
From:   Josef Bacik <josef@...icpanda.com>
To:     Naohiro Aota <naohiro.aota@....com>
Cc:     linux-btrfs@...r.kernel.org, David Sterba <dsterba@...e.com>,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        Qu Wenruo <wqu@...e.com>, Nikolay Borisov <nborisov@...e.com>,
        linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        linux-fsdevel@...r.kernel.org,
        Damien Le Moal <damien.lemoal@....com>,
        Matias Bjørling <mb@...htnvm.io>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH 05/19] btrfs: disable direct IO in HMZONED mode

On Fri, Jun 07, 2019 at 10:10:11PM +0900, Naohiro Aota wrote:
> Direct write I/Os can be directed at existing extents that have already
> been written. Such write requests are prohibited on host-managed zoned
> block devices. So disable direct IO support for a volume with HMZONED mode
> enabled.
> 

That's only if we're nocow, so seems like you only need to disable DIO into
nocow regions with hmzoned?  Thanks,

Josef