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: 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>

2 files changed, 4 insertions, 0 deletions

diff --git a/block/ioctl.c b/block/ioctl.c
index 3884d810efd2..f6d2c6f1f050 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -532,6 +532,8 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
                 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
         case BLKRESETZONE:
                 return blkdev_reset_zones_ioctl(bdev, mode, cmd, arg);
+        case BLKGETZONESZ:
+                return put_uint(arg, bdev_zone_sectors(bdev));
         case HDIO_GETGEO:
                 return blkdev_getgeo(bdev, argp);
         case BLKRAGET:
diff --git a/include/uapi/linux/blkzoned.h b/include/uapi/linux/blkzoned.h
index ff5a5db8906a..281ac605f752 100644
--- a/include/uapi/linux/blkzoned.h
+++ b/include/uapi/linux/blkzoned.h
@@ -137,8 +137,10 @@ struct blk_zone_range {
  *                 sector specified in the report request structure.
  * @BLKRESETZONE: Reset the write pointer of the zones in the specified
  *                sector range. The sector range must be zone aligned.
+ * @BLKGETZONESZ: Get the device zone size in number of 512 B sectors.
  */
 #define BLKREPORTZONE   _IOWR(0x12, 130, struct blk_zone_report)
 #define BLKRESETZONE    _IOW(0x12, 131, struct blk_zone_range)
+#define BLKGETZONESZ    _IOW(0x12, 132, __u32)
 
 #endif /* _UAPI_BLKZONED_H */