[dm-devel] [PATCH v3 09/11] block: Expose queue nr_zones in sysfs

[Christoph Hellwig]

On Fri, Oct 12, 2018 at 09:41:28AM +0200, Hannes Reinecke wrote:
>> +{
>> +	return 0;
>> +}
>>   #endif /* CONFIG_BLK_DEV_ZONED */
>>     static inline bool rq_is_sync(struct request *rq)
>>
> Actually, we should be checking whether we can't blank out this attribute 
> via the is_visible mechanism; after all, not every block device is zoned, 
> and those which are not have no need of the attribute...

The answer would be 0 in this case.  I'm not sure blanking out is worth
it as it will create a lot more code for very little gain..