- sg_init_one(rq->sg, buf, MERGE_BUFFER_LEN);
- err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, buf, gfp);
+ buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
+ ctx = mergeable_buf_to_ctx(buf, len);
+ get_page(alloc_frag->page);
+ alloc_frag->offset += len;
+ hole = alloc_frag->size - alloc_frag->offset;
+ if (hole < len) {
+ /* To avoid internal fragmentation, if there is very likely not
+ * enough space for another buffer, add the remaining space to
+ * the current buffer. This extra space is not included in
+ * the truesize stored in ctx.
+ */
+ len += hole;
+ alloc_frag->offset += hole;
+ }
+
+ sg_init_one(rq->sg, buf, len);
+ err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp);