[mk01]

@Jan

no, you don't have subvolumes.

you still wan't to boot from the oversized 240Gb partiion ? not important at the end but, we can use the space. just to be sure send please "findmnt" output on fully booted system and /etc/fstab. but in general you should:

Code:

1) create a backup from current install and new rootfs boot subvolume. just run those command via console:
sudo -i
stop xbmc
btrfs sub create /backup
btrfs sub snap -r / /backup/@mybeta1
btrfs sub create /R
btrfs sub snap /backup/@mybeta1 /R/@

2) reboot from the new subvol=R/@. actually it will be exact copy of your current install
edit /boot/cmdline.txt and "rootfsopts=noatime,compress=lzo,thread_pool=1,space_cache,autodefrag" change to "rootfsopts=subvol=R/@,noatime,compress=lzo,thread_pool=1,space_cache,autodefrag"

3) after boot, remove old files from top sub volume, rename R to "root", create home, home/@ and move /home/* to it. this will be beta1 default install.
sudo -i
stop xbmc
mkdir /tmp/btroot
mount -t btrfs -o subvolid=0 /dev/sda1 /tmp/btroot
cd /tmp/btroot

(with "ls" you should see your original / directory with R as new and "backup" which contains read-only snapshot of your system - so if all is ok, proceed)

find /tmp/btroot -maxdepth 1 | grep -vw '/R\|/backup' | xargs rm -fr
(this will remove all files / directories from old root - but should keep 'R' and 'backup'. check the output first by removing " | xargs rm -fr" from end. this will just output toplevel folder names to screen - double check that both R and backup is not on the list) don't be scary there, backup/@mybeta1 is readonly and can't be removed by rm.

4) now just create default home and home/@, move the files and we are done.
sudo -i
stop xbmc
btrfs sub create /tmp/btroot/home
btrfs sub create /tmp/btroot/home/@
rsync -avx --progress --delete /home/ /mnt/btroot/home/@/
mv /mnt/btroot/R /mnt/btroot/root
cd /; umount /mnt/btroot
rm -fr /home/*
mount -t btrfs -o subvol=home/@ /dev/sda1 /home
start xbmc (for test)

5) edit fstab and put one line to mount /home
/dev/sda1      /home      btrfs       subvol=home/@,noatime      0        0

6) change R/@ in cmdline.txt to correct root/@ (as we renamed the volume already)

it looks boring, but will take you like 10 minutes while keeping one rollback point in case you hit into problems during updates.
so now you are on "standard" beta1/1.X and

update with this steps http://forum.xbian.org/thread-1768-post-18253.html#pid18253
if anything would happen, don't reboot, create new snapshot from the readonly one, reboot into it and you are back with old system in 1minute (just reboot).

the commands to run would be:

Code:

sudo -i
mount -o subvol=/ /dev/sda1 /mnt
btrfs sub snap /mnt/backup/@mybeta1 /mnt/root/@XXX
.
change cmdline.txt - root/@ will change into root/@XXX - reboot

all the commands (beside rm/rsync) will run few seconds - don't expect any data copying / migrations. and you can start like this from scratch over and over again - please don't, just upgrade to B2.


mk