I just tried this script:
http://marc.merlins.org/perso/btrfs/2014-03.html#Btrfs-Tips_-Btrfs-Scrub-and-Btrfs-Filesystem-Repair
but I did not pass the directory where the filesystem is mounted.
Next I called it correctly: btrfs-scrub /t4
I also tried btrfs scrub start / cancel directly, but
I am not really sure what I did in which order.
Anyway now I can neither cancel nor start btrfs scrub. Rebooting did not help.
Running unmodified Linux 4.3
It seems like scrub stopped and did not clean up. Maybe because:
Dec 8 21:07:41 s5 kernel: [17833.840868] btrfs[23746]: segfault at
ffffffffffffff98 ip 00000000004079e1 sp 00007fffafa27510 error 5 in
btrfs[400000+53000]
How can I now clean this up?
root@s5:~# btrfs --version
Btrfs v3.12
root@s5:~# btrfs scrub status /t4
scrub status for 700900de-e35f-4264-8f5d-1b2b249a5c3a
scrub started at Tue Dec 8 21:05:31 2015, running for 20 seconds
total bytes scrubbed: 3.09GiB with 0 errors
root@s5:~# btrfs scrub cancel /t4
ERROR: scrub cancel failed on /t4: not running
root@s5:~# btrfs scrub start /t4
ERROR: scrub is already running.
To cancel use 'btrfs scrub cancel /t4'.
To see the status use 'btrfs scrub status [-d] /t4'.
--
Wolfgang
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