From: Anuj Gupta anuj20.g@samsung.com
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@vger.kernel.org # 6.1 fixes <8af870aa5b847> ("block: enable bio caching use for passthru IO")
Signed-off-by: Anuj Gupta anuj20.g@samsung.com Signed-off-by: Kanchan Joshi joshi.k@samsung.com Link: https://lore.kernel.org/r/20230523111709.145676-1-anuj20.g@samsung.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- block/blk-map.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/block/blk-map.c +++ b/block/blk-map.c @@ -247,7 +247,7 @@ static struct bio *blk_rq_map_bio_alloc( { struct bio *bio;
- if (rq->cmd_flags & REQ_ALLOC_CACHE) { + if (rq->cmd_flags & REQ_ALLOC_CACHE && (nr_vecs <= BIO_INLINE_VECS)) { bio = bio_alloc_bioset(NULL, nr_vecs, rq->cmd_flags, gfp_mask, &fs_bio_set); if (!bio)