OS6 stuck at booting / mounting btrfs

I'm one small step closer.

I based it off of this post: https://askubuntu.com/questions/157917/how-do-i-recover-a-btrfs-partition-that-will-not-mount

I have done a btrfsck on the system which seems to state that there ís something wrong with my volume:

root@NAS:/var/log/frontview# btrfsck -p /dev/md127 
Checking filesystem on /dev/md127
UUID: d3d6c597-3eb2-4923-bb50-ee21e11dcfec
checking extents [o]
checking free space cache [o]
checking fs roots [O]
checking csums
checking root refs
checking quota groups
Counts for qgroup id: 0/262 are different
our: referenced 12925101330432 referenced compressed 12925101330432
disk: referenced 12849220059136 referenced compressed 12849220059136
diff: referenced 75881271296 referenced compressed 75881271296
our: exclusive 12925101330432 exclusive compressed 12925101330432
disk: exclusive 12849220059136 exclusive compressed 12849220059136
diff: exclusive 75881271296 exclusive compressed 75881271296
Counts for qgroup id: 0/270 are different
our: referenced 1132319191040 referenced compressed 1132319191040
disk: referenced 1131488161792 referenced compressed 1131488161792
diff: referenced 831029248 referenced compressed 831029248
our: exclusive 1132319191040 exclusive compressed 1132319191040
disk: exclusive 1131488161792 exclusive compressed 1131488161792
diff: exclusive 831029248 exclusive compressed 831029248
Counts for qgroup id: 0/277 are different
our: referenced 20862586880 referenced compressed 20862586880
disk: referenced 20729131008 referenced compressed 20729131008
diff: referenced 133455872 referenced compressed 133455872
our: exclusive 20862586880 exclusive compressed 20862586880
disk: exclusive 20729131008 exclusive compressed 20729131008
diff: exclusive 133455872 exclusive compressed 133455872
Counts for qgroup id: 0/278 are different
our: referenced 83479613440 referenced compressed 83479613440
disk: referenced 83248349184 referenced compressed 83248349184
diff: referenced 231264256 referenced compressed 231264256
our: exclusive 83479613440 exclusive compressed 83479613440
disk: exclusive 83248349184 exclusive compressed 83248349184
diff: exclusive 231264256 exclusive compressed 231264256
Counts for qgroup id: 0/279 are different
our: referenced 41265213440 referenced compressed 41265213440
disk: referenced 33458343936 referenced compressed 33458343936
diff: referenced 7806869504 referenced compressed 7806869504
our: exclusive 41265213440 exclusive compressed 41265213440
disk: exclusive 33458343936 exclusive compressed 33458343936
diff: exclusive 7806869504 exclusive compressed 7806869504
found 14220525928448 bytes used, no error found
total csum bytes: 141941444
total tree bytes: 1367834624
total fs tree bytes: 827392000
total extent tree bytes: 347897856
btree space waste bytes: 251305664
file data blocks allocated: 21737524551680
 referenced 14189602930688
 

Then I followed up with mounting the partition:

root@NAS:/mnt# mount -t btrfs -o recovery,nospace_cache,nospace_cache /dev/md127 /mnt/datadisk/

root@NAS:/mnt# cd datadisk/

root@NAS:/mnt/datadisk# ls -l
total 136
drwxr-xr-x  1 root  root       230 Nov 23 18:09 .
drwxr-xr-x  1 root  root        16 Dec 20 18:32 ..
drwxrwxrwx+ 1 admin admin     1352 Nov 17 00:56 Backup
drwxrwxrwx+ 1 guest guest       20 Aug 20 15:11 Documents
drwxr-xr-x  1 admin admin       94 Aug 20 15:07 home
drwxrwxrwx+ 1 guest guest       20 Aug 20 15:11 Music
drwxrwxrwx+ 1 guest guest       38 Sep 15 17:41 Pictures
drwxrwxrwx+ 1   502 dialout    170 Dec 18 18:56 Videos

root@NAS:/mnt/datadisk# du -sh
13T	.

root@NAS:/mnt/datadisk# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev             10M  4.0K   10M   1% /dev
/dev/md0        4.0G  555M  3.1G  15% /
tmpfs           998M     0  998M   0% /dev/shm
tmpfs           998M  3.7M  994M   1% /run
tmpfs           499M  1.1M  498M   1% /run/lock
tmpfs           998M     0  998M   0% /sys/fs/cgroup
/dev/md127       14T   13T  701G  95% /mnt/datadisk

Edit:

I've unmounted the partition and tried to mount it normally again and that worked like a charm:

root@NAS:/mnt# mount -t btrfs /dev/md127 /mnt/datadisk/
root@NAS:/mnt# cd datadisk/
root@NAS:/mnt/datadisk# ls -l
total 136
drwxr-xr-x  1 root  root       230 Nov 23 18:09 .
drwxr-xr-x  1 root  root        16 Dec 20 18:32 ..
drwxrwxrwx+ 1 admin admin     1352 Nov 17 00:56 Backup
drwxrwxrwx+ 1 guest guest       20 Aug 20 15:11 Documents
drwxr-xr-x  1 admin admin       94 Aug 20 15:07 home
drwxrwxrwx+ 1 guest guest       20 Aug 20 15:11 Music
drwxrwxrwx+ 1 guest guest       38 Sep 15 17:41 Pictures
drwxrwxrwx+ 1   502 dialout    170 Dec 18 18:56 Videos

root@NAS:/mnt/datadisk# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev             10M  4.0K   10M   1% /dev
/dev/md0        4.0G  555M  3.1G  15% /
tmpfs           998M     0  998M   0% /dev/shm
tmpfs           998M  3.1M  995M   1% /run
tmpfs           499M  1.1M  498M   1% /run/lock
tmpfs           998M     0  998M   0% /sys/fs/cgroup
/dev/md127       14T   13

Now i'm contemplating on what to do next... I might just do a reboot and hope for the best (as it SHOULD come up again, because there is now nothing that should prevent the mount action from failing). But then again... I have this strange feeling that it might not come up correct again :)