From: Liu Bo <bo.li.liu@oracle.com>
Date: Mon, 12 May 2014 04:47:36 +0000 (+0800)
Subject: Btrfs: mark mapping with error flag to report errors to userspace
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=372fad07b99cc6a9959bfe6b8f46135970c52a21;p=linux-edison.git

Btrfs: mark mapping with error flag to report errors to userspace

commit 5dca6eea91653e9949ce6eb9e9acab6277e2f2c4 upstream.

According to commit 865ffef3797da2cac85b3354b5b6050dc9660978
(fs: fix fsync() error reporting),
it's not stable to just check error pages because pages can be
truncated or invalidated, we should also mark mapping with error
flag so that a later fsync can catch the error.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 82de0909093..2d391ce71ea 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2371,6 +2371,8 @@ int end_extent_writepage(struct page *page, int err, u64 start, u64 end)
 	if (!uptodate) {
 		ClearPageUptodate(page);
 		SetPageError(page);
+		ret = ret < 0 ? ret : -EIO;
+		mapping_set_error(page->mapping, ret);
 	}
 	return 0;
 }