In order to get proper error codes from fsync, we must set an error in
the mapping range when writeback fails.

Signed-off-by: Jeff Layton <jlay...@redhat.com>
---
 fs/dax.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index 85abd741253d..9b6b04030c3f 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -901,8 +901,10 @@ int dax_writeback_mapping_range(struct address_space 
*mapping,
 
                        ret = dax_writeback_one(bdev, mapping, indices[i],
                                        pvec.pages[i]);
-                       if (ret < 0)
+                       if (ret < 0) {
+                               mapping_set_error(mapping, ret);
                                return ret;
+                       }
                }
        }
        return 0;
-- 
2.9.3

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