/usr or /var on btrfs subvol, dropped to dracut

[Chris Murphy]

Since I don't get firstboot, this problem would appear to be release blocking if reproducible.

Installer allows me to create /usr and /var mount points. If they're device type btrfs (maybe LVM, I haven't tried it), anaconda makes them subvols, and the associated /etc/fstab is correctly formed to mount those subvols. On reboot following installation I get this:

https://dl.dropbox.com/u/3253801/ss_usrvar_dracut.png

journalctl at the dracut prompt reveals this line in red:

btrfs: 'root' is not a valid subvolume
mount: wrong fs type, bad option
missing code page or helper rpog
……

The right side text is cutoff. I'm a bit confused what's going on here. Booting DVD in rescue mode, there are subvols, root, boot, home, usr, var. Root is a valid subvolume. And rescue mode mounts root and boot but not usr or var.

Hmmm…

Chris Murphy