1 files changed, 15 insertions, 0 deletions

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index b3dbb8040ed5..bbd396ac9546 100644
--- a/mm/page-writeback.c
+++ b/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)) {