Bug#959228: grub2: Grub2 V2.04-7 does not recognize BTRFS RAID1c4 filesystem

[waxhead]

Steve McIntyre wrote:
> Hi!
> 
> On Fri, May 01, 2020 at 10:57:15AM +0200, waxhead wrote:
>> Steve McIntyre wrote:
>>> On Fri, May 01, 2020 at 10:11:23AM +0200, waxhead wrote:
>>>> Source: grub2
>>>> Version: 2.04-7
>>>> Severity: important
>>>>
>>>> Dear Maintainer,
>>>>
>>>> *** Reporter, please consider answering these questions, where appropriate ***
>>>>
>>>>     * What led up to the situation?
>>>>
>>>>      I waited for grub 2.04-7 to support the BTRFS RAID1c3/RAID1c4 features.
>>>>      it found that it had migraded to testing this morning, did an apt update + apt upgrade to get it.
>>>>      Made sure I ran update-grub, and btrfs balance start -mconvert=raid1c4 /
>>>>      also checked with apt-get source grub2 , browsed the btrfs.c to check , all the raid1c34 parts
>>>>      seemed to be in place.
>>>>      ran systemd reboot and grub failed with unknown filesystem.
>>>>
>>>>     * What exactly did you do (or not do) that was effective (or
>>>>       ineffective)?
>>>>
>>>>     Fired up the latest testing live cd and rebalanced my rootfs back to btrfs raid1
>>>
>>> Try again next Monday - the live images are only updated weekly. Grub
>>> version 2.04-7 only just migrated to testing in the last 24h...
>>>
>> Uhmmm, not sure I understand. The bugreport has nothing to do with the live
>> images (they where suitable for me to recover).
>>
>> The bugreport is for grub2 v2.04-7 which, as you say just migrated to
>> testing. Problem: grub2 v2.04-7 should support RAID1c34 and does not seem to
>> do so.
> 
> Apologies - misunderstood "Fired up the latest testing live cd". Need
> more coffee, clearly... :-/
> 
Howdy,

Just wanted to add that this bug can be closed and buried. I took the 
leap of faith and tested out grub (2.04-8) on a Raid1c4 (metadata) and 
Raid1c3 (data) btrfs which boots just fine!