On Wed, Nov 24, 2021 at 07:07:18AM +0800, Qu Wenruo wrote: > In that case, the missing piece seems to be a way to convert a splitted > plain bio into a REQ_OP_ZONE_APPEND bio. > > Can this be done without slow bvec copying? Yes. I have a WIP stacking driver that converts writes to zone appends and it does just that: sector_t orig_sector = bio->bi_iter.bi_sector; unsigned int bio_flags = bio->bi_opf & ~REQ_OP_MASK; ... clone = bio_clone_fast(bio, GFP_NOIO, &bdev->write_bio_set); ... clone->bi_opf = REQ_OP_ZONE_APPEND | REQ_NOMERGE | bio_flags; bio_set_dev(clone, dev->lower_bdev); clone->bi_iter.bi_sector = zone_sector; trace_block_bio_remap(clone, disk_devt(disk), orig_sector); > > Thanks, > Qu ---end quoted text---
