linux-kernel - [PATCH v2 6/9] mm: set mapping error when launder

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Message-Id: <20170308162934.21989-7-jlayton@redhat.com>
Date:   Wed,  8 Mar 2017 11:29:31 -0500
From:   Jeff Layton <jlayton@...hat.com>
To:     viro@...iv.linux.org.uk, akpm@...ux-foundation.org
Cc:     konishi.ryusuke@....ntt.co.jp, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-nilfs@...r.kernel.org, ross.zwisler@...ux.intel.com,
        jack@...e.cz, neilb@...e.com, openosd@...il.com, adilger@...ger.ca,
        James.Bottomley@...senPartnership.com
Subject: [PATCH v2 6/9] 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 6263affdef88..29ae420a5bf9 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -594,11 +594,15 @@ 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