Hi i found the descriped error in if i execute du with btrfs-progs
v4.5 with kernel v4.5.
floyd@nas ~ $ sudo btrfs version
btrfs-progs v4.5
floyd@nas ~ $ uname -r
4.5.0-040500-generic
floyd@nas ~ $ sudo btrfs fi show
Label: 'RAID' uuid: 3247737b-87f9-4e8c-8db3-2beed50fb104
Total devices 4 FS bytes used 3.71TiB
devid 1 size 2.73TiB used 1.40TiB path /dev/sdf
devid 2 size 2.73TiB used 1.40TiB path /dev/sdb
devid 3 size 2.73TiB used 1.40TiB path /dev/sde
devid 4 size 4.55TiB used 3.22TiB path /dev/sdd
Label: 'BACKUP' uuid: 35e6ff5f-2612-4ef2-9cdb-07b3ccd0f517
Total devices 1 FS bytes used 27.29GiB
devid 1 size 1.36TiB used 29.06GiB path /dev/sdc
floyd@nas ~ $ sudo btrfs subv list -o /media/RAID/
ID 258 gen 214551 top level 5 path apps
ID 259 gen 214722 top level 5 path downloads
ID 260 gen 214711 top level 5 path filme
ID 261 gen 214553 top level 5 path misc
ID 262 gen 214722 top level 5 path musik
ID 263 gen 214555 top level 5 path owncloud
ID 264 gen 214556 top level 5 path serien
-- now the error --
floyd@nas ~ $ sudo btrfs fi du /media/RAID/
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: cannot check space of '/media/RAID/': Unknown error -1
floyd@nas ~ $ 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: cannot check space of '/media/RAID/': Unknown error -1
floyd@nas ~ $ sudo btrfs fi du /media/RAID/musik
ERROR: cannot check space of '/media/RAID/': Unknown error -1
but for subvolume "downloads" it finished without error
floyd@nas ~ $ sudo btrfs fi du /media/RAID/
Total Exclusive Set shared Filename
500.00KiB 0.00B - /media/RAID//apps/Drive Snapshot
167.96MiB 0.00B - /media/RAID//apps/vmware
..
-- more details --
floyd@nas ~ $ sudo btrfs inspect-internal rootid /media/RAID/
5
floyd@nas ~ $ sudo btrfs inspect-internal rootid /media/RAID/apps/
258
floyd@nas ~ $ sudo btrfs inspect-internal dump-super
/media/RAID/apps/Drive\ Snapshot/snapshot.exe
superblock: bytenr=65536, device=/media/RAID/apps/Drive Snapshot/snapshot.exe
---------------------------------------------------------
ERROR: bad magic on superblock on /media/RAID/apps/Drive
Snapshot/snapshot.exe at 65536
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