block: Introduce BLKGETNRZONES ioctl
Get a zoned block device total number of zones. The device can be a partition of the whole device. The number of zones is always 0 for regular block devices. Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -534,6 +534,8 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
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return blkdev_reset_zones_ioctl(bdev, mode, cmd, arg);
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case BLKGETZONESZ:
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return put_uint(arg, bdev_zone_sectors(bdev));
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case BLKGETNRZONES:
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return put_uint(arg, blkdev_nr_zones(bdev));
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case HDIO_GETGEO:
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return blkdev_getgeo(bdev, argp);
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case BLKRAGET:
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@ -142,5 +142,6 @@ struct blk_zone_range {
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#define BLKREPORTZONE _IOWR(0x12, 130, struct blk_zone_report)
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#define BLKRESETZONE _IOW(0x12, 131, struct blk_zone_range)
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#define BLKGETZONESZ _IOW(0x12, 132, __u32)
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#define BLKGETNRZONES _IOW(0x12, 133, __u32)
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#endif /* _UAPI_BLKZONED_H */
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