Only simple tests right now, but the theory is sound.
This mainly required the addition of the fancy in-device move attribute,
which copies all tags associated with an rid from one rbyd to another in
a single transaction.
This is a carryover from the previous littlefs implementation, though it
is easier to implement here since it is effectively a range query on the
rbyd tree, which trees are really good at. This was intentional.
Oh and I suppose this also required implementing lfsr_rename, which has
a few corner cases to watch out for.
It is nice that both lfsr_remove and lfsr_rename can rely on
lfsr_fs_fixgrm to finish all of the removes, which wasn't previously
reasonable due to the overhead of deorphaning.
Christopher Haster
ee37f8c7a6