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326129d02a
Add a helper to queue up a callback. CB_NULL has a bit of special casing because it is special in the specification, but all other new callback operations will be able to share code with this and a few more changes to refactor the callback code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>