virtio_ring: virtqueue_add_outbuf / virtqueue_add_inbuf.

These are specialized versions of virtqueue_add_buf(), which cover
over 80% of cases and are far clearer.

In particular, the scatterlists passed to these functions don't have
to be clean (ie. we ignore end markers).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index ac80288b2920..833f17b6a743 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -41,6 +41,16 @@ int virtqueue_add_buf(struct virtqueue *vq,
                       void *data,
                       gfp_t gfp);
 
+int virtqueue_add_outbuf(struct virtqueue *vq,
+                         struct scatterlist sg[], unsigned int num,
+                         void *data,
+                         gfp_t gfp);
+
+int virtqueue_add_inbuf(struct virtqueue *vq,
+                        struct scatterlist sg[], unsigned int num,
+                        void *data,
+                        gfp_t gfp);
+
 int virtqueue_add_sgs(struct virtqueue *vq,
                       struct scatterlist *sgs[],
                       unsigned int out_sgs,