- kaddr = kmap(&page[i]);
- left = __copy_to_user(buf, kaddr + offset, chunksize);
- kunmap(&page[i]);
- if (left) {
- copied += (chunksize - left);
- break;
- }
+ n = copy_page_to_iter(&page[i], offset, chunksize, to);
+ copied += n;
+ if (n != chunksize)
+ return copied;