I am new to btrfs, being introduced under openSuse 3.2 as the root file 
system. In the past I always made backups of my disks using rsync. I now 
have two versions of the OS on the same system. I was trying to mount 
the second btrfs system as well as the first. I edited my /etc/fstab 
(attached) to add a similar set of mounts as the existing system. Man 
mount said I needed to use the subvolume ID rather than paths. So I 
mounted the root of the dest file system at /usr11, and then executed:

btrfs subvolume list -u /usr11

to obtain the UUID for each subvolume. After some time in emacs I edited 
my fstab to include IDs. It appeared successful as the output of df -a 
which follows demonstrates:

/dev/sdc2      btrfs       21G  5.9G   14G  30% /
/dev/sdc2      btrfs       21G  5.9G   14G  30% /var/tmp
/dev/sdc2      btrfs       21G  5.9G   14G  30% /var/spool
/dev/sdc3      xfs        910G  109G  801G  12% /home
/dev/sdc2      btrfs       21G  5.9G   14G  30% /var/lib/pgsql
/dev/sdc2      btrfs       21G  5.9G   14G  30% /var/opt
/dev/sdc2      btrfs       21G  5.9G   14G  30% /var/log
/dev/sdc2      btrfs       21G  5.9G   14G  30% /var/lib/named
/dev/sdc2      btrfs       21G  5.9G   14G  30% /var/lib/mailman
/dev/sdc2      btrfs       21G  5.9G   14G  30% /tmp
/dev/sdc2      btrfs       21G  5.9G   14G  30% /srv
/dev/sdc2      btrfs       21G  5.9G   14G  30% /opt
/dev/sdc2      btrfs       21G  5.9G   14G  30% /boot/grub2/x86_64-efi
/dev/sdc2      btrfs       21G  5.9G   14G  30% /var/crash
/dev/sdc2      btrfs       21G  5.9G   14G  30% /usr/local
/dev/sdc2      btrfs       21G  5.9G   14G  30% /boot/grub2/i386-pc
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/var/tmp
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/var/spool
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/var/opt
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/var/log
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/var/lib/pgsql
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/var/lib/named
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/var/lib/mailman
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/var/crash
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/usr/local
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/tmp
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/srv
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/opt
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/boot/grub2/x86_64-efi
/dev/sdb2      btrfs       21G  9.1G   11G  47% /usr11/boot/grub2/i386-pc

I was happy until I tried to perform an ls on /usr11/tmp and found that 
it contained the root file system, all the /usr11 files present. My plan 
had been to rsync these two systems, from / to /usr11. If I umount 
/usr1/tmp subvolume and ls on /usr1/tmp, I obtain the expected results. 
Why when I mount the subvolume do I see all of the root files? I have 
attached my fstab for reference. I hope this is an easy one.

Thanks,
Don