[dm-devel] [PATCH 1/4] block: Enhance blk_revalidate_disk_zones()

[Christoph Hellwig]

> diff --git a/block/blk-zoned.c b/block/blk-zoned.c
> index 4bc5f260248a..293891b7068a 100644
> --- a/block/blk-zoned.c
> +++ b/block/blk-zoned.c
> @@ -441,6 +441,57 @@ void blk_queue_free_zone_bitmaps(struct request_queue *q)
>  	q->seq_zones_wlock = NULL;
>  }
>  
> +/**
> + * blk_check_zone - Check a zone information
> + * @q:		request queue
> + * @zone:	the zone to  check
> + * @sector:	start sector of the zone
> + *
> + * Helper function to check zones of a zoned block device. Returns true if the
> + * zone is correct and false if a problem is detected.
> + */
> +static bool blk_check_zone(struct gendisk *disk, struct blk_zone *zone,
> +			   sector_t *sector)

Maybe call this blk_zone_valid?  Also in many places we don't really
do the verbose kerneldoc comments with the duplicated parameter names
for local functions, as the scripts only pick up non-stack ones anyway.

> +	/*
> +	 * All zones must have the same size, with the exception on an eventual
> +	 * smaller last zone.
> +	 */
> +	if (zone->start + zone_sectors < capacity &&
> +	    zone->len != zone_sectors) {
> +		pr_warn("%s: Invalid zone device with non constant zone size\n",
> +			disk->disk_name);
> +		return false;
> +	}

I think we should also move the power of two zone size check here
instead of leaving it in the driver.