From 14d4f1eaa6a55f8df04746239293a521f3f13585 Mon Sep 17 00:00:00 2001 From: Yu Kuai Date: Wed, 10 Sep 2025 14:30:54 +0800 Subject: [PATCH] block: skip unnecessary checks for split bio [ Upstream commit 0b64682e78f7a53ea863e368b1aa66f05767858d ] Lots of checks are already done while submitting this bio the first time, and there is no need to check them again when this bio is resubmitted after split. Hence open code should_fail_bio() and blk_throtl_bio() that are still necessary from submit_bio_split_bioset(). Signed-off-by: Yu Kuai Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe Stable-dep-of: b2f5974079d8 ("block: fix ordering of recursive split IO") Signed-off-by: Sasha Levin --- block/blk-core.c | 2 +- block/blk-merge.c | 6 +++++- block/blk.h | 1 + 3 files changed, 7 insertions(+), 2 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index e5af6eda5a45..03a5d4c9cbf7 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -539,7 +539,7 @@ static inline void bio_check_ro(struct bio *bio) } } -static noinline int should_fail_bio(struct bio *bio) +int should_fail_bio(struct bio *bio) { if (should_fail_request(bdev_whole(bio->bi_bdev), bio->bi_iter.bi_size)) return -EIO; diff --git a/block/blk-merge.c b/block/blk-merge.c index 51fe4ed5b7c0..c411045fcf03 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -130,7 +130,11 @@ struct bio *bio_submit_split_bioset(struct bio *bio, unsigned int split_sectors, bio_chain(split, bio); trace_block_split(split, bio->bi_iter.bi_sector); WARN_ON_ONCE(bio_zone_write_plugging(bio)); - submit_bio_noacct(bio); + + if (should_fail_bio(bio)) + bio_io_error(bio); + else if (!blk_throtl_bio(bio)) + submit_bio_noacct_nocheck(bio); return split; } diff --git a/block/blk.h b/block/blk.h index 0268deb22268..18cc3c2afdd4 100644 --- a/block/blk.h +++ b/block/blk.h @@ -615,6 +615,7 @@ extern const struct address_space_operations def_blk_aops; int disk_register_independent_access_ranges(struct gendisk *disk); void disk_unregister_independent_access_ranges(struct gendisk *disk); +int should_fail_bio(struct bio *bio); #ifdef CONFIG_FAIL_MAKE_REQUEST bool should_fail_request(struct block_device *part, unsigned int bytes); #else /* CONFIG_FAIL_MAKE_REQUEST */