the same environment, update to btrfs-progs 4.5.1, new errors in "fi du"
$ sudo btrfs fi du /media/RAID/owncloud/
140.00KiB 0.00B -
/media/RAID/owncloud//.snapshot/weekly_2016-03-26_07:56:42/docker/postgres
264.00KiB 0.00B -
/media/RAID/owncloud//.snapshot/weekly_2016-03-26_07:56:42/docker
0.00B 0.00B -
/media/RAID/owncloud//.snapshot/weekly_2016-03-26_07:56:42/owncloud.service
0.00B 0.00B -
/media/RAID/owncloud//.snapshot/weekly_2016-03-26_07:56:42/owncloud.setup.txt
...
ERROR: Failed to lookup root id - Inappropriate ioctl for device
ERROR: cannot check space of '/media/RAID/owncloud/': Unknown error -1
$ sudo btrfs fi du /media/RAID/apps
Total Exclusive Set shared Filename
500.00KiB 0.00B - /media/RAID//apps/Drive Snapshot
167.96MiB 0.00B - /media/RAID//apps/vmware
.. [46 rows] ..
ERROR: Failed to lookup root id - Inappropriate ioctl for device
ERROR: cannot check space of '/media/RAID/owncloud/': Unknown error -1
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