From: Suparna Bhattacharya

Safeguard to make sure we break out of pagevec_lookup_tag loop if we 
are beyond the specified range.

--- rc3mm3/fs/mpage.c	2004-04-01 15:54:14.657954776 +0530
+++ linux-2.6.5-rc3-mm3/fs/mpage.c	2004-04-01 16:03:04.525402680 +0530
@@ -637,7 +637,8 @@ mpage_writepages(struct address_space *m
 		scanned = 1;
 	}
 retry:
-	while (!done && (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+	while (!done && (index <= end) && 
+			(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 			PAGECACHE_TAG_DIRTY,
 			min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
 		unsigned i;