On 2020/03/26 18:30, hch@xxxxxxxxxxxxx wrote: > On Thu, Mar 26, 2020 at 08:23:34AM +0000, Damien Le Moal wrote: >> Open & Close all zones are indeed not super useful, at least on SMR drives. But >> finishing all zones does have some benefit, namely the ability to quickly change >> all incompletely written zones into "read-only" full zones. For drives with low >> zone resources (open or active zones), this can be useful to recover zone >> resources. Again, not so much on SMR drives, but this could come in handy for >> ZNS drives with low zone resources (max open zones etc). > > What quantifies the "some benefit"? If you have an application that > micro-manages the zone state it better knows what zones are open. But > even if we want to add a finish all I'd rather wait for ZNS support > to land and real use cases, as it sounds all rather dubious. OK. Sure, we can delay this until ZNS. The use case are indeed not super clear yet. In any case, I think that the patch has value as a nice cleanup of the reset vs reset all request operations (the latter going away). The side effect of it being that open/close/finish all come for free with it. I would like to get it in just for this nice cleanup. -- Damien Le Moal Western Digital Research
