From: Ming Lei ming.lei@redhat.com
mainline inclusion from mainline-5.1-rc1 commit i2e1f4f4d2481d8bf111904c3e45fc0c4c94bf76e category: backport
bch_bio_alloc_pages() is always called on one new bio, so it is safe to access the bvec table directly. Given it is the only kind of this case, open code the bvec table access since bio_for_each_segment_all() will be changed to support for iterating over multipage bvec.
Acked-by: Coly Li colyli@suse.de Reviewed-by: Omar Sandoval osandov@fb.com Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Ming Lei ming.lei@redhat.com Signed-off-by: Jens Axboe axboe@kernel.dk --- drivers/md/bcache/util.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c index 20eddeac1531..62fb917f7a4f 100644 --- a/drivers/md/bcache/util.c +++ b/drivers/md/bcache/util.c @@ -270,7 +270,11 @@ int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask) int i; struct bio_vec *bv;
- bio_for_each_segment_all(bv, bio, i) { + /* + * This is called on freshly new bio, so it is safe to access the + * bvec table directly. + */ + for (i = 0, bv = bio->bi_io_vec; i < bio->bi_vcnt; bv++, i++) { bv->bv_page = alloc_page(gfp_mask); if (!bv->bv_page) { while (--bv >= bio->bi_io_vec)