On Thu, Jun 13, 2019 at 08:46:00AM +0000, Yoshihiro Shimoda wrote: > I believe this patch I sent has already covered it. What do you think? > > For examples (all value units are "sectors"): > default mapping size max_sectors > case 1 240 MAX 2048 --> we use 2048 > case 2 240 512 2048 --> we use 512 > case 3 240 128 2048 --> we use 128 > case 4 240 128 64 --> we use 64 Yes, I guess your version is fine after all: Reviewed-by: Christoph Hellwig <hch@xxxxxx> although I think it might be simpler to just read the value back from the queue in the end.