Re: cannot boot with BTRFS in degraded mode

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hello Giovanni!

Giovanni Biscuolo <g@xelera.eu> writes:

[...]

> [...] all I need to boot is entering the grub editing mode, boot
> degraded and solve the problem with "btrfs replace..." and "btrfs
> balance..."
>
> I was thinking to permanently add "rootflags=[...],degraded" as kernel
> parameter but reading the message I mentioned above:
>
> Altho if it is indeed true that btrfs will now refuse to mount writable 
> if it's degraded like that, that's not such a huge issue either, as the 
> read-only mount can serve as the same warning.  Still, I certainly prefer 
> the refusal to mount entirely without the degraded option, if indeed the 
> filesystem is lacking a component device.  There's nothing quite like 
> forcing me to actually type in "rootflags=degraded" to rub my face in the 
> reality and gravity of the situation I'm in! =:^)
>
> I changed my mind: booting in degraded mode should be done "manually"
> just to solve the issue :-)

Also note that for the time being, the init script of Guix doesn't honor
the "rootflags" kernel argument.

The good news is that there is a patch awaiting testing/review that adds
support for it here: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37305.

Cheers,

Maxim