xarray: Define struct xa_node
This is a direct replacement for struct radix_tree_node. A couple of struct members have changed name, so convert those. Use a #define so that radix tree users continue to work without change. Signed-off-by: NMatthew Wilcox <willy@infradead.org> Reviewed-by: NJosef Bacik <jbacik@fb.com>
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