1 files changed, 15 insertions, 2 deletions

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 666a80e3602e..315e36a96b6f 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -677,13 +677,26 @@ static int core_flush(struct dm_dirty_log *log)
 
 static int disk_flush(struct dm_dirty_log *log)
 {
-        int r;
-        struct log_c *lc = (struct log_c *) log->context;
+        int r, i;
+        struct log_c *lc = log->context;
 
         /* only write if the log has changed */
         if (!lc->touched_cleaned && !lc->touched_dirtied)
                 return 0;
 
+        if (lc->touched_cleaned && log->flush_callback_fn &&
+            log->flush_callback_fn(lc->ti)) {
+                /*
+                 * At this point it is impossible to determine which
+                 * regions are clean and which are dirty (without
+                 * re-reading the log off disk). So mark all of them
+                 * dirty.
+                 */
+                lc->flush_failed = 1;
+                for (i = 0; i < lc->region_count; i++)
+                        log_clear_bit(lc, lc->clean_bits, i);
+        }
+
         r = rw_header(lc, WRITE);
         if (r)
                 fail_log_device(lc);