[dm-devel] [PATCH 06/11] block: Introduce BLKGETZONESZ ioctl

[Bart Van Assche]

On Wed, 2018-10-10 at 10:52 +0900, Damien Le Moal wrote:
>  #define BLKREPORTZONE	_IOWR(0x12, 130, struct blk_zone_report)
>  #define BLKRESETZONE	_IOW(0x12, 131, struct blk_zone_range)
> +#define BLKGETZONESZ	_IOW(0x12, 132, unsigned int)

>From Documentation/ioctl/botching-up-ioctls.txt, a collection of lessons learned
the hard way about ioctls:

 * Only use fixed sized integers. To avoid conflicts with typedefs in userspace
   the kernel has special types like __u32, __s64. Use them.

Please follow that advice.

Thanks,

Bart.