static size_t copy_page_to_iter_pipe(struct page *page, size_t offset, size_t bytes,
			 struct iov_iter *i)
{
	struct pipe_inode_info *pipe = i->pipe;
	struct pipe_buffer *buf;
	size_t off;
	int idx;

	if (unlikely(bytes > i->count))
		bytes = i->count;

	if (unlikely(!bytes))
		return 0;

	if (!sanity(i))
		return 0;

	off = i->iov_offset;
	idx = i->idx;
	buf = &pipe->bufs[idx];
	if (off) {
		if (offset == off && buf->page == page) {
			/* merge with the last one */
			buf->len += bytes;
			i->iov_offset += bytes;
			goto out;
		}
		idx = next_idx(idx, pipe);
		buf = &pipe->bufs[idx];
	}
	if (idx == pipe->curbuf && pipe->nrbufs)
		return 0;
	pipe->nrbufs++;
	buf->ops = &page_cache_pipe_buf_ops;
	get_page(buf->page = page);
	buf->offset = offset;
	buf->len = bytes;
	i->iov_offset = offset + bytes;
	i->idx = idx;
out:
	i->count -= bytes;
	return bytes;
}

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