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

[waxhead]

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.