static int log_write_hva()

in vhost.c [1868:1905]

• 31 lines of code
• 6 McCabe index (conditional complexity)

static int log_write_hva(struct vhost_virtqueue *vq, u64 hva, u64 len)
{
	struct vhost_iotlb *umem = vq->umem;
	struct vhost_iotlb_map *u;
	u64 start, end, l, min;
	int r;
	bool hit = false;

	while (len) {
		min = len;
		/* More than one GPAs can be mapped into a single HVA. So
		 * iterate all possible umems here to be safe.
		 */
		list_for_each_entry(u, &umem->list, link) {
			if (u->addr > hva - 1 + len ||
			    u->addr - 1 + u->size < hva)
				continue;
			start = max(u->addr, hva);
			end = min(u->addr - 1 + u->size, hva - 1 + len);
			l = end - start + 1;
			r = log_write(vq->log_base,
				      u->start + start - u->addr,
				      l);
			if (r < 0)
				return r;
			hit = true;
			min = min(l, min);
		}

		if (!hit)
			return -EFAULT;

		len -= min;
		hva += min;
	}

	return 0;
}