+ /*
+ * This page may have been truncated. Tell the
+ * caller about it.
+ */
+ err = -EINVAL;
+ inode = vma->vm_file->f_mapping->host;
+ size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+ if (!page->mapping || page->index >= size)
+ goto err_unlock;
+