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
