linux-kernel - [PATCH 3/3] mm: set mapping error when launder

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Date:   Sun,  5 Mar 2017 08:35:35 -0500
From:   Jeff Layton <jlayton@...hat.com>
To:     viro@...iv.linux.org.uk, konishi.ryusuke@....ntt.co.jp
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-nilfs@...r.kernel.org
Subject: [PATCH 3/3] mm: set mapping error when launder_pages fails

If launder_page fails, then we hit a problem writing back some inode
data. Ensure that we communicate that fact in a subsequent fsync since
another task could still have it open for write.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 mm/truncate.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/truncate.c b/mm/truncate.c
index dd7b24e083c5..49ad4e2a6cb6 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -593,11 +593,15 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
 
 static int do_launder_page(struct address_space *mapping, struct page *page)
 {
+	int ret;
+
 	if (!PageDirty(page))
 		return 0;
 	if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
 		return 0;
-	return mapping->a_ops->launder_page(page);
+	ret = mapping->a_ops->launder_page(page);
+	mapping_set_error(mapping, ret);
+	return ret;
 }
 
 /**
-- 
2.9.3