[arch-dev-public] [RFC] btrfs multi-device support in pre-3.6 kernels

Jan Steffens jan.steffens at gmail.com
Tue Oct 2 19:37:05 EDT 2012

On Wed, Oct 3, 2012 at 1:30 AM, Tom Gundersen <teg at jklm.no> wrote:
> Hi guys,
> With systemd-193 and linux-3.6 we will finally have reliable support
> for btrfs multi-device filesystems (assembling them used to be racy).
> However, the added udev rules that makes this work do not work at all
> on pre-3.6 kernels. We could keep the old (racey) rules in the btrfs
> package to deal with this situation. However, that means scanning all
> btrfs devices twice on boot  for everyone on post-3.6 kernels. As I
> expect the number of people using multi-device btrfs (which is still
> experimental) with an linux-lts kernel to be limited, I'm not too keen
> on optimizing for this case.
> I propose we either just drop the old btrfs rules and tell users of
> linux-lts+btrfs multi-device to upgrade to linux, or we add the rules
> to the linux-lts package.
> Any thoughts?
> Cheers,
> Tom

That's fine, in my opinion. People running Btrfs shouldn't be using an
LTS kernel anyway.

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