With btrfs, it seems that there is a single opportunity to use:
(eg, if there is a missing disk in a RAID1 configuration)
How can one force the degraded mount to proceed
rwa second time?
How can one edit the filesystem device so as to pretend that it has not yet been mounted
I understand there are kernel patches which remove various mount checks, however I want to patch the filesystem instead, and have all the checks still in place.