linux-ext4 - [RFC PATCH 2/4] dax: set errors in mapping when writeback fails

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Message-Id: <20170331192603.16442-3-jlayton@redhat.com>
Date:   Fri, 31 Mar 2017 15:26:01 -0400
From:   Jeff Layton <jlayton@...hat.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
        akpm@...ux-foundation.org, tytso@....edu, jack@...e.cz,
        willy@...radead.org, neilb@...e.com
Subject: [RFC PATCH 2/4] dax: set errors in mapping when writeback fails

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 <jlayton@...hat.com>
---
 fs/dax.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index de622d4282a6..b76b3ffc141a 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -892,8 +892,10 @@ 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) {
+				filemap_set_wb_error(mapping, ret);
 				return ret;
+			}
 		}
 	}
 	return 0;
-- 
2.9.3