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Prior to kernel 72 I was using kernel 68 and older. For over a year I was able
to do a full backup of btrfs volumes using rsync -a /.... Starting with kernel
72 (I did not use 70) rsync issues messages several times during the backup
that the target is full, then continues. Important: If I reformat the btrfs
target and rerun, it issues messages for different files, they are never the
same! The files do not get copied, they could be small 1k or 150k files. If I
format the target to ext4 it works fine, or if I go back to kernel 68 is works
fine with btrfs. This is occurring on 2 different macs, and on internal targets
as well as externals which are connected via firewire. I did searches and found
many btrfs issues but not one like this. Keep in mind when I went back to
kernel 68 that is all that change, nothing else, only the kernel files so this
seems to be a kernel issue. Also, I noticed that when I attempt Yast online
updates some now fail with out-of-space, then I hit retry and it works!
Something really wrong with btrfs on kernels beyond 68.

Reproducible: Always

Steps to Reproduce:
1. Format a btrfs volume
2. rsync -a /volume with no snapshots  /new volume
3.
Actual Results:  
No space on target intermittently and with different files. Changes each
attempt.

Expected Results:  
rsync should complete normally as it did on kernel 68 and prior.