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

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

Noted commit 319ff40a54 ("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>
This commit is contained in:
Yu Kuai 2025-09-10 14:30:47 +08:00 committed by Jens Axboe
parent e37b5596a1
commit 5b38ee5a4a
1 changed files with 6 additions and 13 deletions
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19
drivers/md/raid0.c
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@ -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,
&mddev->bio_set);
if (IS_ERR(split)) {
bio->bi_status = errno_to_blk_status(PTR_ERR(split));
bio_endio(bio);
bio = bio_submit_split_bioset(bio,
zone->zone_end - bio->bi_iter.bi_sector,
&mddev->bio_set);
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)