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-rw-r--r--mm/page-writeback.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index b3dbb80..bbd396a 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)) {
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