Commit 5b38ee5a authored Sep 10, 2025 by Yu Kuai Committed by Jens Axboe Sep 10, 2025

md/raid0: convert raid0_handle_discard() to use bio_submit_split_bioset()



Unify bio split code, and prepare to fix ordering of split IO

Noted commit 319ff40a ("md/raid0: Fix performance regression for large
sequential writes") already fix ordering of split IO by remapping bio to
underlying disks before resubmitting it, with the respect
md_submit_bio() already split it by sectors, and raid0_make_request()
will split at most once for unaligned IO. This is a bit hacky and we'll
convert this to solution in general later.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent e37b5596

drivers/md/raid0.c

+6 −13

Original line number	Diff line number	Diff line
		@@ -463,23 +463,16 @@ static void raid0_handle_discard(struct mddev mddev, struct bio bio)
		zone = find_zone(conf, &start);

		if (bio_end_sector(bio) > zone->zone_end) {
		struct bio *split = bio_split(bio,
		zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO,
		bio = bio_submit_split_bioset(bio,
		zone->zone_end - bio->bi_iter.bi_sector,
		&mddev->bio_set);

		if (IS_ERR(split)) {
		bio->bi_status = errno_to_blk_status(PTR_ERR(split));
		bio_endio(bio);
		if (!bio)
		return;
		}

		bio_chain(split, bio);
		trace_block_split(split, bio->bi_iter.bi_sector);
		submit_bio_noacct(bio);
		bio = split;
		end = zone->zone_end;
		} else
		} else {
		end = bio_end_sector(bio);
		}

		orig_end = end;
		if (zone != conf->strip_zone)