Re: [PATCHv2 1/6] blk-sysfs: remove q->sysfs_lock for attributes which don't need it

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On Sat, Feb 22, 2025 at 08:44:51PM +0800, Ming Lei wrote:
> IMO, it is fine to read it lockless without READ_ONCE/WRITE_ONCE because
> disk->nr_zones is defined as 'unsigned int', which won't return garbage
> value anytime.
> 
> But I don't object if you want to change to READ_ONCE/WRITE_ONCE.

It changes every time the disk capacity changes.  And on the (uncommon)
reformats.  So the best locking would be the same as for the disk
capacity.





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