From: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
commit 46930b7cc7727271c9c27aac1fdc97a8645e2d00 upstream.
commit <8af870aa5b847> ("block: enable bio caching use for passthru IO")
introduced bio-cache for passthru IO. In case when nr_vecs are greater
than BIO_INLINE_VECS, bio and bvecs are allocated from mempool (instead
of percpu cache) and REQ_ALLOC_CACHE is cleared. This causes the side
effect of not freeing bio/bvecs into mempool on completion.
This patch lets the passthru IO fallback to allocation using bio_kmalloc
when nr_vecs are greater than BIO_INLINE_VECS. The corresponding bio
is freed during call to blk_mq_map_bio_put during completion.
Cc: stable@xxxxxxxxxxxxxxx # 6.1
fixes <8af870aa5b847> ("block: enable bio caching use for passthru IO")
Signed-off-by: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
Signed-off-by: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230523111709.145676-1-anuj20.g@xxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/blk-map.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -246,7 +246,7 @@ static struct bio *blk_rq_map_bio_alloc(
{
struct bio *bio;
- if (rq->cmd_flags & REQ_POLLED) {
+ if (rq->cmd_flags & REQ_POLLED && (nr_vecs <= BIO_INLINE_VECS)) {
blk_opf_t opf = rq->cmd_flags | REQ_ALLOC_CACHE;
bio = bio_alloc_bioset(NULL, nr_vecs, opf, gfp_mask,
