btrfs: reloc: refactor finishing part of upper linkage into finish_upper_links()
After handle_one_tree_backref(), all newly added (not cached) edges and
nodes have the following features:
- Only backref_edge::list[LOWER] is linked.
This means, we can only iterate from botton to top, not the other
direction.
- Newly added nodes are not added to cache rb_tree yet
So to finish the backref cache, we still need to finish the links and
add all nodes into backref cache rb_tree.
This patch will refactor the existing code into finish_upper_links(),
add more comments of each branch, and why we need to do all the work.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1 file changed