btrfs send ... what am I doing wrong?

btrfs send -v /.snapshots/446/snapshot | pv -r | btrfs rec -v /rootfullbackup/data
...
[37.7MB/s]
peter:~/xen # echo $?
0
peter:~/xen # btrfs send -c /.snapshots/446/snapshot /.snapshots/453/snapshot | pv -r | btrfs rec /rootfullbackup/data/snapshot
At subvol /.snapshots/453/snapshot
At snapshot snapshot
ERROR: open data/snapshot failed. No such file or directory
[1.62MB/s]
peter:~/xen # btrfs send -c /.snapshots/446/snapshot /.snapshots/453/snapshot | pv -r | btrfs rec /rootfullbackup/data/snapshot/
.config/        backup/         boot/           etc/            lib/            mart            mnt/            proc/           rootfullbackup/ sbin/           sys/            var/
.readahead      bin/            dev/            home/           lib64/          media/          mounts/         root/           run/            selinux/        usr/
peter:~/xen # btrfs send -c /.snapshots/446/snapshot /.snapshots/453/snapshot | pv -r | btrfs rec /rootfullbackup/data
At subvol /.snapshots/453/snapshot
At snapshot snapshot
ERROR: creating snapshot snapshot -> snapshot failed. File exists
[1.38MB/s]
peter:~/xen # sudo btrfs sub list / | tail
ID 835 gen 32182 top level 5 path .snapshots/444/snapshot
ID 836 gen 32282 top level 5 path .snapshots/445/snapshot
ID 837 gen 32394 top level 5 path .snapshots/446/snapshot
ID 838 gen 32459 top level 5 path .snapshots/447/snapshot
ID 839 gen 32460 top level 5 path .snapshots/448/snapshot
ID 840 gen 32510 top level 5 path .snapshots/449/snapshot
ID 841 gen 32618 top level 5 path .snapshots/450/snapshot
ID 842 gen 32732 top level 5 path .snapshots/451/snapshot
ID 843 gen 32849 top level 5 path .snapshots/452/snapshot
ID 844 gen 32966 top level 5 path .snapshots/453/snapshot
peter:~/xen # sudo btrfs sub list /rootfullbackup/data/ | tail
ID 256 gen 6 top level 5 path data
ID 258 gen 200 top level 5 path data/snapshot



2013-05-25 - I think the answer is that I should have used -p instead of -c in the incremental send. todo: test that