---

yaml
---
r: 200216
b: refs/heads/master
c: d87815c
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 254c8c2dbf0e06a560a5814eb90cb628adb2de66
+refs/heads/master: d87815cb2090e07b0b0b2d73dc9740706e92c80c

trunk/mm/page-writeback.c

@@ -851,7 +851,22 @@ int write_cache_pages(struct address_space *mapping,
 		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
 			range_whole = 1;
 		cycled = 1; /* ignore range_cyclic tests */
+
+		/*
+		 * If this is a data integrity sync, cap the writeback to the
+		 * current end of file. Any extension to the file that occurs
+		 * after this is a new write and we don't need to write those
+		 * pages out to fulfil our data integrity requirements. If we
+		 * try to write them out, we can get stuck in this scan until
+		 * the concurrent writer stops adding dirty pages and extending
+		 * EOF.
+		 */
+		if (wbc->sync_mode == WB_SYNC_ALL &&
+		    wbc->range_end == LLONG_MAX) {
+			end = i_size_read(mapping->host) >> PAGE_CACHE_SHIFT;
+		}
 	}
+
 retry:
 	done_index = index;
 	while (!done && (index <= end)) {