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

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Message-ID: <SN6PR04MB523168E867B817288A587BA48CEA0@SN6PR04MB5231.namprd04.prod.outlook.com>
Date:   Tue, 18 Jun 2019 08:17:52 +0000
From:   Naohiro Aota <Naohiro.Aota@....com>
To:     Josef Bacik <josef@...icpanda.com>
CC:     "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
        Qu Wenruo <wqu@...e.com>, Nikolay Borisov <nborisov@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hannes Reinecke <hare@...e.com>,
        "linux-fsdevel@...r.kernel.org" <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 2019/06/13 23:00, Josef Bacik wrote:
> 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
> 

True. And actually, I had to disable or ignore BTRFS_INODE_NODATACOW on HMZONED.
I'll replace this patch with that one.
Thanks,