On Sun, 24 Nov 2024 21:00:52 -0800, Christoph Hellwig wrote: > On Mon, Nov 25, 2024 at 11:22:51AM +0800, LongPing Wei wrote: > > When dm level submit a bio with bi_size > max_sectors_kb of lower device, > > blk_mq_submit_bio will split it into several ones with limited bi_size. > > It may be a potential unordered issue as it breaks the ZWL design in dm > > on 6.6. > > What is ZWL? And why mention 6.6? And why do you care about ordering? ZWL is Zone-Write-Locking and it was replaced by Zone-Write-Plugging on 6.12. > There is no real ordering requirement in the block layer. According to the design constraints of zoned device, write requests in the same zone must be dispatched in order of address and there can be no holes in the middle
