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extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
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extern int cio_cancel (struct subchannel *);
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extern int cio_set_options (struct subchannel *, int);
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extern int cio_update_schib(struct subchannel *sch);
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extern int cio_commit_config(struct subchannel *sch);