md/raid5: export raid5 unplugging interface.
Also remove remaining accesses to ->queue and ->gendisk when ->queue is NULL (As it is in a DM target). Signed-off-by: NeilBrown <neilb@suse.de>
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@@ -502,5 +502,6 @@ static inline int algorithm_is_DDF(int layout)
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}
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extern int md_raid5_congested(mddev_t *mddev, int bits);
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extern void md_raid5_unplug_device(raid5_conf_t *conf);
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extern int raid5_set_cache_size(mddev_t *mddev, int size);
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#endif
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