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

[Christoph Hellwig]

On Fri, Jan 10, 2025 at 09:51:18AM +0000, John Garry wrote:
> ok, and that just comes down to the behavior of queue_var_store(), which 
> mimics sysfs_ops.store
>
> I will note that queue_var_store and queue_var_store64 differ in behaviour 
> here :(
>
>> ->store_limits uses
>> the simpler and harder to get wrong convention of returning 0 on
>> success.
>>
>
> understood, so any reason why not to change the rest (apart from being 
> busy)?

Not real urge.  The idea here was to get it right for the new one.
Changing the existing would be a lot of churn for a relatively small
improvement.  For me that's only worth it when touching the area anyway.
Which might or might not happen when trying to remove the sysfs_lock
around ->store.