[ 140/171] libceph: report socket read/write error message

[Greg Kroah-Hartman]

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sage Weil <sage@xxxxxxxxxxx>

(cherry picked from commit 3a140a0d5c4b9e35373b016e41dfc85f1e526bdb)

We need to set error_msg to something useful before calling ceph_fault();
do so here for try_{read,write}().  This is more informative than

libceph: osd0 192.168.106.220:6801 (null)

Signed-off-by: Sage Weil <sage@xxxxxxxxxxx>
Reviewed-by: Alex Elder <elder@xxxxxxxxxxx>
Reviewed-by: Yehuda Sadeh <yehuda@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ceph/messenger.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -2287,14 +2287,18 @@ restart:
 	ret = try_read(con);
 	if (ret == -EAGAIN)
 		goto restart;
-	if (ret < 0)
+	if (ret < 0) {
+		con->error_msg = "socket error on read";
 		goto fault;
+	}
 
 	ret = try_write(con);
 	if (ret == -EAGAIN)
 		goto restart;
-	if (ret < 0)
+	if (ret < 0) {
+		con->error_msg = "socket error on write";
 		goto fault;
+	}
 
 done:
 	mutex_unlock(&con->mutex);


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