Am Sat, 25 Oct 2014 14:35:33 -0600 schrieb Chris Murphy <li...@colorremedies.com>:
> > On Oct 25, 2014, at 2:33 PM, Chris Murphy <li...@colorremedies.com> wrote: > > > > > On Oct 25, 2014, at 6:24 AM, Marc Joliet <mar...@gmx.de> wrote: > >> > >> First of all: does grub2 support booting from a btrfs file system with > >> skinny-metadata, or is it irrelevant? > > > > Seems plausible if older kernels don't understand skinny-metadata, that > > GRUB2 won't either. So I just tested it with grub2-2.02-0.8.fc21 and it > > works. I'm surprised, actually. > > I don't understand the nature of the incompatibility with older kernels. Can > they not mount a Btrfs volume even as ro? If so then I'd expect GRUB to have > a problem, so I'm going to guess that maybe a 3.9 or older kernel could ro > mount a Btrfs volume with skinny extents and the incompatibility is writing. That sounds plausible, though I hope for a definitive answer. (FWIW, I originally asked because I couldn't find any commits to grub2 related to skinny metadata; the updates to the btrfs driver were fairly sparse.) -- Marc Joliet -- "People who think they know everything really annoy those of us who know we don't" - Bjarne Stroustrup
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