This backport applies (with mild offset) to both v5.4.67 and v5.8.11:
From ee1dfad5325ff1cfb2239e564cd411b3bfe8667a Mon Sep 17 00:00:00 2001
From: Mike Snitzer snitzer@redhat.com Date: Mon, 14 Sep 2020 13:04:19 -0400 Subject: [PATCH] dm: fix bio splitting and its bio completion order for regular IO
dm_queue_split() is removed because __split_and_process_bio() _must_ handle splitting bios to ensure proper bio submission and completion ordering as a bio is split.
Otherwise, multiple recursive calls to ->submit_bio will cause multiple split bios to be allocated from the same ->bio_split mempool at the same time. This would result in deadlock in low memory conditions because no progress could be made (only one bio is available in ->bio_split mempool).
This fix has been verified to still fix the loss of performance, due to excess splitting, that commit 120c9257f5f1 provided.
Fixes: 120c9257f5f1 ("Revert "dm: always call blk_queue_split() in dm_process_bio()"") Cc: stable@vger.kernel.org # 5.0+, requires custom backport due to 5.9 changes Reported-by: Ming Lei ming.lei@redhat.com Signed-off-by: Mike Snitzer snitzer@redhat.com
--- a/drivers/md/dm.c 2020-09-21 18:46:16.000000000 -0400 +++ b/drivers/md/dm.c 2020-09-21 18:33:21.000000000 -0400 @@ -1727,23 +1727,6 @@ return ret; }
-static void dm_queue_split(struct mapped_device *md, struct dm_target *ti, struct bio **bio) -{ - unsigned len, sector_count; - - sector_count = bio_sectors(*bio); - len = min_t(sector_t, max_io_len((*bio)->bi_iter.bi_sector, ti), sector_count); - - if (sector_count > len) { - struct bio *split = bio_split(*bio, len, GFP_NOIO, &md->queue->bio_split); - - bio_chain(split, *bio); - trace_block_split(md->queue, split, (*bio)->bi_iter.bi_sector); - generic_make_request(*bio); - *bio = split; - } -} - static blk_qc_t dm_process_bio(struct mapped_device *md, struct dm_table *map, struct bio *bio) { @@ -1773,14 +1756,12 @@ if (current->bio_list) { if (is_abnormal_io(bio)) blk_queue_split(md->queue, &bio); - else - dm_queue_split(md, ti, &bio); + /* regular IO is split by __split_and_process_bio */ }
if (dm_get_md_type(md) == DM_TYPE_NVME_BIO_BASED) return __process_bio(md, map, bio, ti); - else - return __split_and_process_bio(md, map, bio); + return __split_and_process_bio(md, map, bio); }
static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio)