On 11/25/24 2:58 PM, 韦龙平(Groot) wrote: > 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.
6.10. >> 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 -- Damien Le Moal Western Digital Research
