[PATCH 05/11] block: add a store_limit operations for sysfs entries

[Christoph Hellwig]

On Fri, Jan 10, 2025 at 09:15:09AM +0000, John Garry wrote:
>> +	int (*store_limit)(struct gendisk *disk, const char *page,
>
> I don't really see why this returns an int, while the queue features 
> callback methods return a ssize_t. I know that the res variable in 
> queue_attr_store() gets mixed with an int for updating the queue limits, 
> but I don't see that as a reason to use int here.

The normal store methods have the annoying calling convention where
they return the parsed string length on success.  ->store_limits uses
the simpler and harder to get wrong convention of returning 0 on
success.