bcachefs: __bch2_btree_node_iter_fix() improvements

Being more rigorous about noting when the key the iterator currently
poins to has changed - which should also give us a nice performance
improvement due to not having to check if we have to skip other bsets
backwards as much.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2019-09-07 19:17:40 -04:00 • committed by Kent Overstreet
commit c0fc30dad5