On Tue, May 17, 2011 at 3:18 PM, Dieter Plaetinck wrote:

We've discussed in detail why we should discourage users from doing this (although I actually only heard Anthony raise his concerns) - see http://mailman.archlinux.org/pipermail/arch-releng/2010-December/001341.html

jeez i yammer on a lot :-) i ended up changing the structure up a bit anyway, and mammoth waves of responsibility have prevented me from finishing that hook :-( ... in time.

It's turning out impractical to expect any kind of support for such advanced btrfs schemes (where we somehow enforce or even just support subvolumes) in AIF. So for now I just allow users to use the btrfs directly. See commit https://github.com/Dieterbe/aif/commit/281b49fd3dd0984805a9dc435d1a2c36c675e...

This will at least enable people to actually use and test btrfs.

nice. it should be ok -- even though the root subvol cannot be snapshot, the biggest issue was that even trying to _move_ or reflink the individual directories (/usr, /lib, etc) into an empty subvol triggered a full on copy operation ... Chris has expressed that this is a bug and would be fixed, but i haven't tested it recently to see if it was taken care of. i think i'll just warn the user on every boot for a few seconds that they have dead directories in their btrfs root -- it doesn't start to really be dead space until the reflinks start to break en mass (large upgrades/etc). C Anthony