btrfs: add a helper to get the delayed ref node from the data/tree ref
We have several different ways we refer to references throughout the code and it's not consistent and there's a bit of duplication. In order to clean this up I want to have one structure we use to define reference information, and one structure we use for the delayed reference information. Start this process by adding a helper to get from the btrfs_delayed_data_ref/btrfs_delayed_tree_ref to the btrfs_delayed_ref_node so that it'll make moving these structures around simpler. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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