libceph: report socket read/write error message

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@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 63e1252d3af5..6e2f67816f61 100644
--- 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);