Received-SPF: pass (google.com: domain of linux-kernel+bounces-104186-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) client-ip=147.75.48.161;
From: Martin Steigerwald <martin@lichtvoll.de>
To: linux-bcachefs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
 linux-kernel@vger.kernel.org, Kent Overstreet <kent.overstreet@linux.dev>
Subject:
 Re: bcachefs: do not run 6.7: upgrade to 6.8 immediately if you have a multi
 device fs
Date: Fri, 15 Mar 2024 09:57:34 +0100
Message-ID: <12416320.O9o76ZdvQC@lichtvoll.de>
In-Reply-To: <muwlfryvafsskt2l2hgv3szwzjfn7cswmmnoka6zlpz2bxj6lh@ugceww4kv3jr>
References: <muwlfryvafsskt2l2hgv3szwzjfn7cswmmnoka6zlpz2bxj6lh@ugceww4kv3jr>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 7Bit
Content-Type: text/plain; charset="us-ascii"

Hi Kent, hi.

Kent Overstreet - 15.03.24, 05:41:09 CET:
> there's a bug in 6.7 with filesystems that are mid upgrade and then get
> downgraded not getting marked in the superblock as downgraded, and this
> translates to a really horrific bug in splitbrain detection when the old
> version isn't updating member sequence nmubers and you go back to the
> new version - this results in every device being kicked out of the fs.

I take it that single device BCacheFS filesystems can be upgraded just fine?

I can also recreate and repopulate once I upgraded to 6.8. Still waiting a 
bit.

Best.
-- 
Martin