The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 46930b7cc7727271c9c27aac1fdc97a8645e2d00 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023052844-splatter-emphasize-8de2@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

46930b7cc772 ("block: fix bio-cache for passthru IO") 7e2e355dd9c9 ("block: extend bio-cache for non-polled requests")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 46930b7cc7727271c9c27aac1fdc97a8645e2d00 Mon Sep 17 00:00:00 2001 From: Anuj Gupta anuj20.g@samsung.com Date: Tue, 23 May 2023 16:47:09 +0530 Subject: [PATCH] block: fix bio-cache for passthru IO

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

diff --git a/block/blk-map.c b/block/blk-map.c index 04c55f1c492e..46eed2e627c3 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -248,7 +248,7 @@ static struct bio *blk_rq_map_bio_alloc(struct request *rq, { 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)