+static int read_partial_msg_data_bounce(struct ceph_connection *con)
+{
+ struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
+ struct page *page;
+ size_t off, len;
+ u32 crc;
+ int ret;
+
+ if (unlikely(!con->bounce_page)) {
+ con->bounce_page = alloc_page(GFP_NOIO);
+ if (!con->bounce_page) {
+ pr_err("failed to allocate bounce page\n");
+ return -ENOMEM;
+ }
+ }
+
+ crc = con->in_data_crc;
+ while (cursor->total_resid) {
+ if (!cursor->resid) {
+ ceph_msg_data_advance(cursor, 0);
+ continue;
+ }
+
+ page = ceph_msg_data_next(cursor, &off, &len, NULL);
+ ret = ceph_tcp_recvpage(con->sock, con->bounce_page, 0, len);
+ if (ret <= 0) {
+ con->in_data_crc = crc;
+ return ret;
+ }
+
+ crc = crc32c(crc, page_address(con->bounce_page), ret);
+ memcpy_to_page(page, off, page_address(con->bounce_page), ret);
+
+ ceph_msg_data_advance(cursor, ret);
+ }
+ con->in_data_crc = crc;
+
+ return 1; /* must return > 0 to indicate success */
+}
+