block: Introduce BLKGETZONESZ ioctl
Get a zoned block device zone size in number of 512 B sectors. The zone size is always 0 for regular block devices. Reviewed-by: NHannes Reinecke <hare@suse.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NDamien Le Moal <damien.lemoal@wdc.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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