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Introduce the function bdev_zone_start() as a more explicit (and clear) replacement for ALIGN_DOWN() to get the start sector of a zone containing a particular sector of a zoned block device. Use this new helper in blkdev_get_zone_info() and blkdev_report_zones_cached(). Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>