On Thu, Dec 12, 2024 at 11:21:07AM +0530, Kanchan Joshi wrote: > On 12/11/2024 12:43 PM, Christoph Hellwig wrote: > > The changes looks good to me. I'll ty to send out an API for querying > > the paramters in the next so that we don't merge the granularity as dead > > code > > What do you have in mind for this API. New fcntl or ioctl? > With ability limited to querying only or.... Yes, new fcntl or ioctl, query the number of streams and (nominal) stream granularity as a start. There is a few other things that might be useful: - check if the size is just nominal or not, aka if the device can shorten it. FDP currently allows for that, but given that notifications for that are out of bounds it makes a complete mess of software actually trying to use it for more than simple hot/cold separation like cachelib, so we find a way to query that in the spec. - reporting of the remaining capacity per stream, although I'm not sure if that should be in the same ioctl/fcntl, or better done using a separate interface that has the stream number as input and the capacity as out, which would seem a lot simpler
