This does not affect any Rockstor releases but for those experimenting with kernel versions please note that early 4.14 kernels had an issue that affected bcache (with all fs types). But this was apparently fixed in 4.14.2:
from: https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg70825.html
we have:
> There is a known bug in 4.14 that affects all bcache backed file
> systems (maybe more, I think it's not a bcache specific bug). You need
> to downgrade or upgrade your kernel. Fix should be in 4.14.2.
>
> The bug was found quickly enough ...