В Mon, 14 Oct 2013 22:50:10 +0200 Vladimir 'φ-coder/phcoder' Serbinenko <phco...@gmail.com> пишет:
> On 14.10.2013 22:45, Chris Murphy wrote: > > > > On Oct 14, 2013, at 1:29 PM, Vladimir 'φ-coder/phcoder' Serbinenko > > <phco...@gmail.com> wrote: > > > >>> So it seems that GRUB is using relative pathnames to the default > >>> subvolume. > >> This is not intentional. When this part of code was written there was no > >> set-default available at all so this couldn't be tested and I simply > >> followed the specification. It told to take root_tree and > >> root_dir_objectid from superblock then go to "default" directory. What > >> of this needs to be changed? Just remove "default" and make it part of > >> path? We would need to change grub-mkrelpath to match runtime behaviour. > >> Is there a way to detect that mountinfo gives garbage and somehow get > >> where the real root points? > > > > Here's the response. It seems similar but not identical to what you > > described above. > > > > http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg27955.html > > > I don't see what is the difference between that and what GRUB currently > does. Will look tomorrow morning. I have a feeling that there was some misunderstanding about the problem. Or btrfs developers do not really intend to have multiple "active filesystems" at the same time and see "set-default" as the only legal way to switch between filesystem instances.
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