On Mon, May 22, 2023 at 11:38:37AM -0700, Bart Van Assche wrote: > Send requeued requests to the I/O scheduler such that the I/O scheduler > can control the order in which requests are dispatched. I guess you are addressing UFS zoned for REQ_OP_WRITE: https://lore.kernel.org/linux-block/8e88b22e-fdf2-5182-02fe-9876e8148947@xxxxxxx/ I am wondering how this way can maintain order for zoned write request. requeued WRITE may happen in any order, for example, req A and req B is in order, now req B is requeued first, then follows req A. So req B is requeued to scheduler first, and issued to LLD, then request A is requeued and issued to LLD later, then still re-order? Or sd_zbc can provide requeue order guarantee? Thanks, Ming
