This is a note to let you know that I've just added the patch titled block: fix bounce_clone_bio for passthrough bios to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: block-fix-bounce_clone_bio-for-passthrough-bios.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b90994c6ab623baf9268df9710692f14920ce9d2 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig <hch@xxxxxx> Date: Wed, 24 Feb 2021 08:24:05 +0100 Subject: block: fix bounce_clone_bio for passthrough bios From: Christoph Hellwig <hch@xxxxxx> commit b90994c6ab623baf9268df9710692f14920ce9d2 upstream. Now that bio_alloc_bioset does not fall back to kmalloc for a NULL bio_set, handle that case explicitly and simplify the calling conventions. Based on an earlier patch from Chaitanya Kulkarni. Fixes: 3175199ab0ac ("block: split bio_kmalloc from bio_alloc_bioset") Reported-by: Chaitanya Kulkarni <Chaitanya.Kulkarni@xxxxxxx> Signed-off-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- block/bounce.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) --- a/block/bounce.c +++ b/block/bounce.c @@ -214,8 +214,7 @@ static void bounce_end_io_read_isa(struc __bounce_end_io_read(bio, &isa_page_pool); } -static struct bio *bounce_clone_bio(struct bio *bio_src, gfp_t gfp_mask, - struct bio_set *bs) +static struct bio *bounce_clone_bio(struct bio *bio_src, gfp_t gfp_mask) { struct bvec_iter iter; struct bio_vec bv; @@ -242,8 +241,11 @@ static struct bio *bounce_clone_bio(stru * asking for trouble and would force extra work on * __bio_clone_fast() anyways. */ - - bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs); + if (bio_is_passthrough(bio_src)) + bio = bio_kmalloc(gfp_mask, bio_segments(bio_src)); + else + bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), + &bounce_bio_set); if (!bio) return NULL; bio->bi_disk = bio_src->bi_disk; @@ -294,7 +296,6 @@ static void __blk_queue_bounce(struct re unsigned i = 0; bool bounce = false; int sectors = 0; - bool passthrough = bio_is_passthrough(*bio_orig); bio_for_each_segment(from, *bio_orig, iter) { if (i++ < BIO_MAX_PAGES) @@ -305,14 +306,14 @@ static void __blk_queue_bounce(struct re if (!bounce) return; - if (!passthrough && sectors < bio_sectors(*bio_orig)) { + if (!bio_is_passthrough(*bio_orig) && + sectors < bio_sectors(*bio_orig)) { bio = bio_split(*bio_orig, sectors, GFP_NOIO, &bounce_bio_split); bio_chain(bio, *bio_orig); submit_bio_noacct(*bio_orig); *bio_orig = bio; } - bio = bounce_clone_bio(*bio_orig, GFP_NOIO, passthrough ? NULL : - &bounce_bio_set); + bio = bounce_clone_bio(*bio_orig, GFP_NOIO); /* * Bvec table can't be updated by bio_for_each_segment_all(), Patches currently in stable-queue which might be from hch@xxxxxx are queue-5.10/block-split-bio_kmalloc-from-bio_alloc_bioset.patch queue-5.10/block-fix-bounce_clone_bio-for-passthrough-bios.patch