btrfs-progs 4.11 includes this patch[0] which has updated the option parser which has enforced the order in which arguments and options appear in. See this email for context[1] [0]: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=010ceab56e067b87ea282fde6ff792c1ceefd7dc [1]: https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg62226.html