[PATCH 5.15 187/511] md/raid0: Factor out helper for mapping and submitting a bio

5.15-stable review patch. If anyone has any objections, please let me know.

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From: Jan Kara jack@suse.cz

[ Upstream commit af50e20afb401cc203bd2a9ff62ece0ae4976103 ]

Factor out helper function for mapping and submitting a bio out of raid0_make_request(). We will use it later for submitting both parts of a split bio.

Signed-off-by: Jan Kara jack@suse.cz Reviewed-by: Yu Kuai yukuai3@huawei.com Link: https://lore.kernel.org/r/20230814092720.3931-1-jack@suse.cz Signed-off-by: Song Liu song@kernel.org Stable-dep-of: 319ff40a5427 ("md/raid0: Fix performance regression for large sequential writes") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/raid0.c | 79 +++++++++++++++++++++++----------------------- 1 file changed, 40 insertions(+), 39 deletions(-)

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index 6917d72c18132..eca0022588c6d 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -570,54 +570,21 @@ static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) bio_endio(bio); }

-static bool raid0_make_request(struct mddev *mddev, struct bio *bio) +static void raid0_map_submit_bio(struct mddev *mddev, struct bio *bio) { struct r0conf *conf = mddev->private; struct strip_zone *zone; struct md_rdev *tmp_dev; - sector_t bio_sector; - sector_t sector; - sector_t orig_sector; - unsigned chunk_sects; - unsigned sectors; - - if (unlikely(bio->bi_opf & REQ_PREFLUSH) - && md_flush_request(mddev, bio)) - return true; - - if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { - raid0_handle_discard(mddev, bio); - return true; - } - - bio_sector = bio->bi_iter.bi_sector; - sector = bio_sector; - chunk_sects = mddev->chunk_sectors; - - sectors = chunk_sects - - (likely(is_power_of_2(chunk_sects)) - ? (sector & (chunk_sects-1)) - : sector_div(sector, chunk_sects)); - - /* Restore due to sector_div */ - sector = bio_sector; - - if (sectors < bio_sectors(bio)) { - struct bio *split = bio_split(bio, sectors, GFP_NOIO, - &mddev->bio_set); - bio_chain(split, bio); - submit_bio_noacct(bio); - bio = split; - } + sector_t bio_sector = bio->bi_iter.bi_sector; + sector_t sector = bio_sector;

if (bio->bi_pool != &mddev->bio_set) md_account_bio(mddev, &bio);

- orig_sector = sector; zone = find_zone(mddev->private, &sector); switch (conf->layout) { case RAID0_ORIG_LAYOUT: - tmp_dev = map_sector(mddev, zone, orig_sector, &sector); + tmp_dev = map_sector(mddev, zone, bio_sector, &sector); break; case RAID0_ALT_MULTIZONE_LAYOUT: tmp_dev = map_sector(mddev, zone, sector, &sector); @@ -625,13 +592,13 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio) default: WARN(1, "md/raid0:%s: Invalid layout\n", mdname(mddev)); bio_io_error(bio); - return true; + return; }

if (unlikely(is_rdev_broken(tmp_dev))) { bio_io_error(bio); md_error(mddev, tmp_dev); - return true; + return; }

bio_set_dev(bio, tmp_dev->bdev); @@ -644,6 +611,40 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio) mddev_check_writesame(mddev, bio); mddev_check_write_zeroes(mddev, bio); submit_bio_noacct(bio); +} + +static bool raid0_make_request(struct mddev *mddev, struct bio *bio) +{ + sector_t sector; + unsigned chunk_sects; + unsigned sectors; + + if (unlikely(bio->bi_opf & REQ_PREFLUSH) + && md_flush_request(mddev, bio)) + return true; + + if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { + raid0_handle_discard(mddev, bio); + return true; + } + + sector = bio->bi_iter.bi_sector; + chunk_sects = mddev->chunk_sectors; + + sectors = chunk_sects - + (likely(is_power_of_2(chunk_sects)) + ? (sector & (chunk_sects-1)) + : sector_div(sector, chunk_sects)); + + if (sectors < bio_sectors(bio)) { + struct bio *split = bio_split(bio, sectors, GFP_NOIO, + &mddev->bio_set); + bio_chain(split, bio); + submit_bio_noacct(bio); + bio = split; + } + + raid0_map_submit_bio(mddev, bio); return true; }