On Wed, Jun 25, 2025 at 02:59:06PM +0900, Damien Le Moal wrote: > Any zoned DM target that requires zone append emulation will use the > block layer zone write plugging. In such case, DM target drivers must > not split BIOs using dm_accept_partial_bio() as doing so can potentially > lead to deadlocks with queue freeze operations. Regular write operations > used to emulate zone append operations also cannot be split by the > target driver as that would result in an invalid writen sector value > return using the BIO sector. > > In order for zoned DM target drivers to avoid such incorrect BIO > splitting, we must ensure that large BIOs are split before being passed > to the map() function of the target, thus guaranteeing that the > limits for the mapped device are not exceeded. > > dm-crypt and dm-flakey are the only target drivers supporting zoned > devices and using dm_accept_partial_bio().
Is there any good way to catch usage dm_accept_partial_bio on zone devices so that issues like this don't get reintroduced later?
