btrfs: reloc: refactor indirect tree backref processing into its own function
The processing of indirect tree backref (TREE_BLOCK_REF) is the most complex work. We need to grab the fs root, do a tree search to locate all its parent nodes, link all needed edges, and put all uncached edges to pending edge list. This is definitely worth a helper function. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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