Am 13.01.19 um 22:51 schrieb Oliver Freyermuth: > (resending with gzipped attachment) > > Dear BTRFS experts, > > I just upgraded to 4.20.1 from 4.19 (not sure if related) and my btrfs backup volume entered read-only mode when running btrfs-cleaner, > i.e. when purging old subvolumes. > > I have attached the kernel log from when this happens. > > What is the best way to proceed from here? Running "btrfs check repair" on the device? > Worst case it's not a huge issue to lose the data stored there, it's my backup volume after all. > But it would be good to understand the cause and know if there is a better fix than starting from scratch. > > Cheers, > Oliver > > PS: Please include me directly in replies, I am not subscribed to the list. > Dear BTRFS experts, attached is the output of "btrfs check -p /dev/sdc2". I can't guarantee the volume has never been cleanly unmounted. I found several past occasions of this here: https://www.spinics.net/lists/linux-btrfs/msg69040.html and here: https://unix.stackexchange.com/questions/369133/dealing-with-btrfs-ref-backpointer-mismatches-backref-missing but without conclusive result. Please let me know what's the best way to proceed. From these links, it seems btrfs check --repair _should_ help, but I would prefer to get some advice first whether this is really the best approach. Cheers, Oliver
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