linux-kernel - Re: [PATCH 08/19] btrfs: make unmirroed BGs readonly only if we have at least one writable BG

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Message-ID: <20190613140921.a2kmty5p6lzqztej@MacBook-Pro-91.local>
Date:   Thu, 13 Jun 2019 10:09:22 -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 08/19] btrfs: make unmirroed BGs readonly only if we have
 at least one writable BG

On Fri, Jun 07, 2019 at 10:10:14PM +0900, Naohiro Aota wrote:
> If the btrfs volume has mirrored block groups, it unconditionally makes
> un-mirrored block groups read only. When we have mirrored block groups, but
> don't have writable block groups, this will drop all writable block groups.
> So, check if we have at least one writable mirrored block group before
> setting un-mirrored block groups read only.
> 

I don't understand why you want this.  Thanks,

Josef