On 8/4/23 9:47?AM, Bart Van Assche wrote: > Writes in sequential write required zones must happen at the write > pointer. Even if the submitter of the write commands (e.g. a filesystem) > submits writes for sequential write required zones in order, the block > layer or the storage controller may reorder these write commands. > > The zone locking mechanism in the mq-deadline I/O scheduler serializes > write commands for sequential zones. Some but not all storage controllers > require this serialization. Introduce a new request queue flag to allow > block drivers to indicate that they preserve the order of write commands > and thus do not require serialization of writes per zone. Looking at how this is used, why not call it QUEUE_FLAG_ZONE_WRITE_LOCK instead? That'd make the code easier to immediately grok, rather than deal with double negations. -- Jens Axboe
