1240 readpage:
1241                 /*
1242                  * A previous I/O error may have been due to temporary
1243                  * failures, eg. multipath errors.
1244                  * PG_error will be set again if readpage fails.
1245                  */
1246                 ClearPageError(page);
1247                 /* Start the actual read. The read will unlock the page. */
1248                 error = mapping->a_ops->readpage(filp, page);
1249 
1250                 if (unlikely(error)) {
1251                         if (error == AOP_TRUNCATED_PAGE) {
1252                                 page_cache_release(page);
1253                                 goto find_page;
1254                         }
1255                         goto readpage_error;
1256                 }
1257 
1258                 if (!PageUptodate(page)) {
1259                         error = lock_page_killable(page);
1260                         if (unlikely(error))
1261                                 goto readpage_error;
1262                         if (!PageUptodate(page)) {
1263                                 if (page->mapping == NULL) {
1264                                         /*
1265                                          * invalidate_mapping_pages got it
1266                                          */
1267                                         unlock_page(page);
1268                                         page_cache_release(page);
1269                                         goto find_page;
1270                                 }
1271                                 unlock_page(page);
1272                                 shrink_readahead_size_eio(filp, ra);
1273                                 error = -EIO;
1274                                 goto readpage_error;
1275                         }
1276                         unlock_page(page);
1277                 }
1278