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De-duplicate the same functionality in several places by hoisting the is_dot_dotdot() utility function into linux/fs.h. Suggested-by: Amir Goldstein <[email protected]> Reviewed-by: Jeff Layton <[email protected]> Reviewed-by: Amir Goldstein <[email protected]> Acked-by: Christian Brauner <[email protected]> Signed-off-by: Chuck Lever <[email protected]>