| Message ID | 20181126021720.19471-15-ming.lei@redhat.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | block: support multi-page bvec | expand |
On Mon, Nov 26, 2018 at 10:17:14AM +0800, Ming Lei wrote: > 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: Christoph Hellwig <hch@lst.de> Reviewed-by: Omar Sandoval <osandov@fb.com> > Signed-off-by: Ming Lei <ming.lei@redhat.com> > --- > 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) > -- > 2.9.5 >
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)