diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index eb277bd..01b9cb8 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -871,6 +871,7 @@
 	pgoff_t uninitialized_var(writeback_index);
 	pgoff_t index;
 	pgoff_t end;		/* Inclusive */
+	pgoff_t done_index;
 	int cycled;
 	int range_whole = 0;
 	long nr_to_write = wbc->nr_to_write;
@@ -897,6 +898,7 @@
 		cycled = 1; /* ignore range_cyclic tests */
 	}
 retry:
+	done_index = index;
 	while (!done && (index <= end) &&
 	       (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 					      PAGECACHE_TAG_DIRTY,
@@ -906,6 +908,8 @@
 		for (i = 0; i < nr_pages; i++) {
 			struct page *page = pvec.pages[i];
 
+			done_index = page->index + 1;
+
 			/*
 			 * At this point we hold neither mapping->tree_lock nor
 			 * lock on the page itself: the page may be truncated or
@@ -968,7 +972,7 @@
 	}
 	if (!wbc->no_nrwrite_index_update) {
 		if (wbc->range_cyclic || (range_whole && nr_to_write > 0))
-			mapping->writeback_index = index;
+			mapping->writeback_index = done_index;
 		wbc->nr_to_write = nr_to_write;
 	}